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EE1303-Power Electronics Lab Manual


MUTHAYAMMAL ENGINEERING COLLEGE, RASIPURAM
 Department of Electrical and Electronics Engineering




                      V Semester – BE (EEE)

              EE 1303 - Power Electronics Laboratory

                               Manual



Prepared by                                         Approved by
Prof.M.Muruganandam, M.E.,(Ph.D),          Dr P.Murugesan,B.E.,Ph.D.,
AP/ EEE                                    Proff. & HOD/EEE


Revision No.:1                                              Date:24.06.2008




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EE1303-Power Electronics Lab Manual




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EE1303-Power Electronics Lab Manual


                    INSTRUCTIONS TO THE CANDIDATE

SAFETY:
      You are doing experiments in Power Electronics lab with high voltage and
high current electric power. It may cause even a fatal or loss of energy of your
body system. To avoid this please keep in mind the followings

      In case of any wrong observations, you have to SWITCH OFF the power
      supply related with it.
      You have to tuck in your shirts or wear an overcoat.
      You have to wear shoes compulsorily and stand on mats made by
      insulating materials to electrically isolate your body from the earth.

ATTENDANCE:
       If you absent for a lab class then you have lost several things to learn.
Laboratory should be treated as temple, which will decide your life. So don’t fail
to make your presence with your record notebook having completed
experiments, observation with completed experiments, day’s experiment
particulars with required knowledge about it and stationeries.

MAKING CONNECTIONS:
     Get circuit diagram approval from your staff in charge.
     Go to the respective worktable and start to give connection as per the
     circuit diagram from source side.
     Make series circuit connections before the parallel circuits like voltmeter
     connections.
     Before switch on the power, get circuit connection approval from the staff
     in charge.

DOING EXPERIMENT:
     Start the experiment in the presence of an instructor / staff in-charge and
     do the same by proper procedure.
     If staff permits you then precede your experiment.

OBSERVATION:
    Before take the wave forms calibrate the CRO.
    Note all the required readings in their respective tables.
    Note all the wave forms from the CRO.

CALCULATION:
    Calculate the required quantities by suitable formulae and tabulate them
    with units.
    Draw the necessary graphs and write the result with reference.
    Get verification of observation and calculation from your staff in charge.


RECORD:
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EE1303-Power Electronics Lab Manual


        Shows the performance of equipment and yourself. It will be very useful
for future reference. So keep it as follows.
        Write neatly; as they have to be preserved enter the readings in the record
        notebook those have been written in your observation.
        Units should be written for all quantities.
        Draw necessary graphs and complete the record before coming to the
        next lab class.
        Don’t forget to write the theory with precaution and inference of each
        experiment.

                                MAY I HELP YOU

   1. Device ratings should be noted.
   2. Moving coil meters should be used for DC measurements.
   3. Moving iron meters should be used for AC measurements.
   4. Use isolated supply for the CRO.
   5. Use attenuation probe for high voltage measurements in CRO.




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EE1303-Power Electronics Lab Manual


                           CONTENTS

Sl.No.                   Name of the experiment                        Page No.

  1.     VI CHARACTERISTICS OF SCR                                            2

  2.     VI CHARACTERISTICS OF TRIAC                                          8

  3.     VI CHARACTERISTICS OF MOSFET                                     14

  4.     VI CHARACTERISTICS OF IGBT                                       20

  5.     TRANSIENT CHARACTERISTICS OF MOSFET AND SCR                      24

  6.     SINGLE PHASE AC TO DC FULLY CONTROLLED CONVERTER                 30

  7.     SINGLE PHASE AC TO DC HALF CONTROLLED CONVERTER                  36

  8.     STEP DOWN MOSFET BASED CHOPPER                                   42

  9.     STEP UP MOSFET BASED CHOPPER                                     46

  10.    IGBT BASED SINGLE PHASE PWM INVERTER                             50

         SERIES RESONANT DC-DC CONVERTER
  11.                                                                     56
         (ZERO CURRENT SWITCHING)

         PARALLEL RESONANT DC-DC CONVERTER
  12.                                                                     60
         (ZERO VOLTAGE SWITCHING)




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                         VI CHARACTERISTICS OF SCR

CIRCUIT DIAGRAM:

VI Characteristics




1 Half wave Rectifier




Triggering Circuit for 1 Half wave Rectifier




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                            VI CHARACTERISTICS OF SCR

AIM:
      (i) To Conduct an experiment and obtain the anode forward conduction
characteristics of the given SCR also find the latching and holding currents of the given
SCR.
      (ii) To Demonstrate how a single-phase half wave rectifier circuit can be
implemented using a given SCR, AC power source and RC firing circuit.

APPARATUS REQUIRED:
S.No.         Name of the item                Type                  Range             Quantity
  1   SCR module                             TYN612               600V,12A               1
  2   Ammeter                                  MC                (0-100) mA              1
  3   Ammeter                                  MC                 (0-50) mA              1
  4   Voltmeter                                MC                  (0-30) V              1
  5   Digital Multimeter                        -                      -                 1
  6   RC Firing Module                          -                      -                 1
  7   Rheostat                                  -                   220                  1
  8   CRO                                       -                      -                 1
  9   CRO probe                                 -                      -                 1
 10   Patch Cards                               -                      -                10

FORMULA USED:
                                                          Vm
   1. Average dc output voltage Vdc is            Vdc =        (1 + cos )
                                                                                          1
                                                          V 1                 sin 2       2
   2. RMS output voltage is Vrms                  Vrms   = m                +
                                                           2                     2
                                                          2
                                                        Vdc
   3. Rectification efficiency                    % =    2
                                                       Vrms
                                                       V
   4. Form factor                                 FF = rms
                                                       Vdc
   5. Peak inverse voltage                        PIV = Vm
   6. Ripple factor                               RF = FF 2 1
                                                                                      1
                                                           1              sin 2       2
   7. Power factor                                PF =                  +
                                                           2                 2
Where
        Vm = maximum or peak voltage in volts =     2Vs
        Vs = Supply voltage in volts
           = Firing angle
           = Extinction angle
          = Conduction angle = -

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EE1303-Power Electronics Lab Manual


MODEL GRAPH:

VI CHARACTERISTICS OF SCR




1 HALF WAVE RECTIFIER




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PRECAUTION:

   1. The initial set gate current should be taken as minimum in order to take the
      consecutive readings.

   2. Maximum anode current, anode-cathode voltage and gate current limit is 600mA,
      30V and 20mA respectively

   3. Before setting each gate current, keep the Anode to cathode voltage (VAK) as
      zero.

PROCEDURE:

VI Characteristics:
   1. Connections are made as per the circuit diagram.
   2. Switch on the 230V AC supply through three-pin power chord.
   3. Keep the gate current (IG) to a suitable value (say minimum of 4 mA to 5mA)
   4. Now slowly increase the anode-cathode voltage (VAK) by varying the pot till
      thyristor get turned on, with the indication that anode cathode voltage decreases
      to it on state voltage drop (i.e 0.7V) and the anode current increases.
   5. Note the values of voltmeter (VAK) which is the break over voltage and the
      ammeter (I L) which is the latching current value.
   6. Further, increase the anode current in steps by varying the anode-cathode
      voltage and note the readings.
   7. Now reduces the anode cathode voltage (VAK) till the thyristor turned off and find
      the holding current.
   8. For various gate current take the readings and tabulate it.
   9. Finally, a graph of anode current Vs anode-cathode voltage is plotted for various
      gate current.




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TABULATION:

VI Characteristics:

                      IG1 =                      IG2 =                      IG3 =
 S.No.
            VAK(V)            IA(mA)    VAK(V)           IA(mA)    VAK(V)           IA(mA)
    1

    2

    3

    4

    5

    6




1 HALF WAVE RECTIFIER:


               Firing           Practical   Practical         Theoretical Theoretical
  S.NO.
              angle °            Vavg (V)    Iavg (A)           Vavg (V)     Vrms
    1

    2

    3

    4

    5

    6




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1 HALF WAVE RECTIFIER:

   1. Connections are made as per the circuit diagram.
   2. Switch on the triggering circuit
   3. Switch on the 24V AC supply
   4. By varying potentiometer, vary the firing angle of the converter in order to vary
      the output voltage step by step.
   5. For each step note down the firing angle, output voltage and load current.
   6. The output voltage is theoretically calculated for each step and the readings are
      tabulated.

INFERENCE:




DISCUSSION QUESTIONS:

1. What is power electronics?
2. What are the types of converter in power electronics?
3. What is latching and holding current?
4. What is break over voltage?
5. What is forward bias and reverse bias?
6. What is firing angle?
7. Why the negative voltage is not possible in semi converter?
8. What is freewheeling diode?




RESULT:




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                        VI CHARACTERISTICS OF TRIAC

CIRCUIT DIAGRAM:

VI Characteristics




Single-phase A.C phase controller for illumination control




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                            VI CHARACTERISTICS OF TRIAC

AIM:

     (i) To obtain the forward and reverse conduction characteristics of the given
TRIAC also find the latching and holding currents of the given TRIAC.

       (ii) To demonstrate how a single- phase AC phase controller can be implemented
for controlling the illumination of lamp, using given TRIAC and RC triggering circuit and
draw the voltage wave form across the lamp.

APPARATUS REQUIRED:

S.No.           Name of the item               Type               Range        Quantity
  1     TRIAC module                          BTA 12            600V,12A          1
  2     Ammeter                                 MC             (0-100) mA         1
  3     Ammeter                                 MC              (0-50) mA         1
  4     Voltmeter                               MC               (0-30) V         1
  5     Voltmeter                               MI               (0-300)V         1
  6     Ammeter                                 MI             (0-500)mA          1
  7     Digital Multimeter                       -                   -            1
  8     Transformer                              -               230/12V          1
  9     CRO                                      -                   -            1
 10     CRO Probe                                -                   -            1
 11     Patch Cards                              -                   -           10

FORMULA USED:
                                                                                  1
                                                               1        Sin2      2
        The RMS output voltage is                V0 RMS = Vs          +
                                                                          2
Where
           = Firing angle
        Vs = Source voltage

PRECAUTION:

   1. The initial set gate current should be taken as the value, for gate current for the
      consecutive readings.

   2. Maximum triac current, voltage across the triac and gate current limit is 600mA,
      30V and 20mA respectively.

   3. To see the phase controlled converter output waveform, use a 230 / 12 V
      transformer for isolation purpose.


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MODEL GRAPH:

VI CHARACTERISTICS OF TRIAC




Single-phase A.C phase controller for illumination control




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PROCEDURE:

VI Characteristics:

   1. Connections are made as per the circuit diagram with MT1 +Ve with respect to
      MT2.
   2. Switch on the 230V AC supply through three-pin power chord.
   3. Keep the gate current (IG) to a suitable value (say minimum of 4 mA to 5mA)
   4. Now slowly increase the anode-cathode voltage (VAK) by varying the pot till Triac
      get turned on, with the indication that anode cathode voltage decreases to it’s on
      state voltage drop (i.e 0.7V) and the anode current increases.
   5. Note the values of voltmeter (VAK) which is the break over voltage and the
      ammeter (I L) which is the latching current value.
   6. Further, increase the anode current in steps by varying the anode-cathode
      voltage and note the readings.
   7. Now reduces the anode cathode voltage (VAK) till the triac turned off and find the
      holding current.
   8. For various gate current take the readings and tabulate it.
   9. Connect MT2 terminal of Triac is + Ve with respect to MT1
   10. Repeat the same procedure from 2 to 8
   11. Finally, a graph of anode current Vs anode-cathode voltage is plotted for various
      gate current for forward and reverse biases.

Single-phase A.C phase controller for illumination control

   1. Connections are made as per the circuit diagram.
   2. Switch on the 230 V, 50 Hz AC supply
   3. By varying potentiometer, vary the firing angle of the converter in order to vary
      the output voltage there by the illumination of the lamp will be varied.
   4. For each step note down the firing angle, ammeter reading, voltmeter reading
      and the output voltage waveform from and tabulate it.
   5. Finally, the output voltage waveform is plotted and the theoretical RMS voltage is
      calculated.


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TABULATION:

VI Characteristics:

MT1 is + Ve with respect to MT2

                        IG1 =                       IG2 =                      IG3 =
 S.No.
               VAK(V)           IA(mA)     VAK(V)           IA(mA)    VAK(V)           IA(mA)
      1

      2

      3

      4

      5

MT2 is + Ve with respect to MT1

                        IG1 =                       IG2 =                      IG3 =
 S.No.
               VAK(V)           IA(mA)     VAK(V)           IA(mA)    VAK(V)           IA(mA)
      1

      2

      3

      4

      5

Single-phase A.C phase controller

S.No.     Firing angle ( ) in      I0RMS Measured    V0RMS Measured   V0RMS Calculated
                degree                 in Amps           in Volts         in Volts
  1
  2
  3
  4
  5


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INFERENCE:




DISCUSSION QUESTIONS:

1. What is bidirectional device?
2. What is bipolar device?
3. What are the applications of phase controlled converter in home appliances?
4. What is the number and range of given triac?
5. What type of firing is used here?
6. How do you change the firing angle?
7. Draw the symbol of Triac.




RESULT:




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EE1303-Power Electronics Lab Manual


                     VI CHARACTERISTICS OF MOSFET



CIRCUIT DIAGRAM:




VI CHARACTERISTICS




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                        VI CHARACTERISTICS OF MOSFET

AIM:
      (i) Obtain the steady – state output – side characteristics and transfer
characteristics of the given MOSFET, for a specified value of gate – source
voltage.

      (ii) Identify whether given switch is MOSFET or IGBT by finding the
output– side characteristics.

APPARATUS REQUIRED:

S.No.         Name of the item                Type           Range       Quantity
  1     MOSFET module                        IRF 840       600V,5A          1
  2     Ammeter                                MC         (0-100) mA        1
  3     Voltmeter                              MC           (0-10)V         1
  4     Voltmeter                              MC           (0-30) V        1
  5     CRO                                     -               -           1
  6     CRO Probe                               -               -           1
  7     Patch Cards                             -               -          10

FORMULA USED:

                                          ID
1. Trans conductance              Gm =         mho
                                          VDS
                                          V DS
2. Output resistance              RDS   =      ohm
                                           ID
Where:
 ID = Change in drain current.
 VDS = Change in drain to source voltage

PRECAUTION:

   The initial set gate voltage should be taken as minimum in order to take the
   consecutive readings.

PROCEDURE:

DRAIN CHARACTERISTICS

   1. Connections are made as per the circuit diagram
   2. Switch on the 230V AC supply through three-pin power chord.




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EE1303-Power Electronics Lab Manual


MODEL GRAPH:

DRAIN CHARACTERISTICS




TRANSFER CHARACTERISTICS




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  3. Keep the gate - source voltage (VGS) to a suitable value (say minimum of 6V to
     7V)
  4. Now slowly increase the drain-source voltage (VDS) by varying the pot till
     MOSFET get turned on, with the indication that drain-source voltage decreases
     to it on state voltage drop.
  5. Note down the values of drain-source voltage (VDS) and the drain current (I D)
  6. For various gate-source voltage take the different set of readings and tabulate it.
  7. Finally, a graph of drain-source voltage (VDS) Vs drain current (ID) is plotted for
     various gate-source voltage.

TRANSFER CHARACTERISTICS

  1. Connections are made as per the circuit diagram
  2. Switch on the 230V AC supply through three-pin power chord.
  3. Keep the Drain - source voltage (VDS) to a suitable value
  4. Now slowly increase the gate - source voltage (VGS) by varying the pot till
     MOSFET get turned on, with the indication that drain current getting constant
     value.
  5. Note down the values of gate-source voltage (VGS) and the drain current (I D)
  6. Finally, a graph of gate - source voltage (VGS) Vs drain current (ID) is plotted.




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TABULATION:

Drain Characteristics:

                 VGS1 =                 VGS2 =                     VGS3 =
 S.No.
            VDS(V)     ID(mA)      VDS(V)     ID(mA)          VDS(V)     ID(mA)
    1

    2

    3

    4

    5


Transfer Characteristics:
                                VDS =

                  VGS(V)
 S.No.                                   ID(mA)
    1

    2

    3

    4

    5




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EE1303-Power Electronics Lab Manual


INFERENCE:




DISCUSSION QUESTIONS:

1. What is current control device?
2. What is voltage control device?
3. What is the number and range of given MOSFET?
4. Draw the symbol of MOSFET?
5. What is Transconductance?
6. How to find the output resistance?




RESULT:




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EE1303-Power Electronics Lab Manual


                     VI CHARACTERISTICS OF IGBT


CIRCUIT DIAGRAM:

VI CHARACTERISTICS




MODEL GRAPH:




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                           VI CHARACTERISTICS OF IGBT

AIM:
      (i) Obtain the steady – state output – side characteristics and transfer
characteristics of the given IGBT, for a specified value of gate – source voltage.

      (ii) Identify whether given switch is MOSFET or IGBT by finding the
output– side characteristics.

APPARATUS REQUIRED:

S.No.         Name of the item                   Type          Range       Quantity
  1     IGBT module                             IRGBC        600V,10A         1
  2     Ammeter                                   MC        (0-100) mA        1
  3     Voltmeter                                 MC          (0-10)V         1
  4     Voltmeter                                 MC          (0-30) V        1
  5     CRO                                        -              -           1
  6     CRO Probe                                  -              -           1
  7     Patch Cards                                -              -          10

FORMULA USED:

                                           IC
1. Trans conductance               Gm =        mho
                                           VCE
                                           VCE
2. Output resistance               RCE   =     ohm
                                            IC
Where:
 IC = Change in collector current.
 VCE = Change in collector to emitter voltage

PRECAUTION:

   The initial set gate voltage should be taken as minimum in order to take the
   consecutive readings.

PROCEDURE:

DRAIN CHARACTERISTICS

   1. Connections are made as per the circuit diagram
   2. Switch on the 230V AC supply through three-pin power chord.
   3. Keep the gate - emitter voltage (VGE) to a suitable value (say minimum of 6V to
        7V)

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EE1303-Power Electronics Lab Manual


TABULATION:


              VGE1 =                  VGE2 =                     VGE3 =
 S.No.
         VCE(V)     IC(mA)       VCE(V)     IC(mA)          VCE(V)     IC(mA)
   1

   2

   3

   4

   5




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   4. Now slowly increase the drain-source voltage (VDS) by varying the pot till
      MOSFET get turned on, with the indication that drain-source voltage decreases
      to it on state voltage drop.
   5. Note down the values of drain-source voltage (VDS) and the drain current (I D)
   6. For various gate-source voltage take the different set of readings and tabulate it.
   7. Finally, a graph of drain-source voltage (VDS) Vs drain current (ID) is plotted for
      various gate-source voltage.

INFERENCE:




DISCUSSION QUESTIONS:

1. What is current control device?
2. What is voltage control device?
3. What is the number and range of given IGBT?
4. Draw the symbol of IGBT?
5. What are differences between Transistor, MOSFET and IGBT?
6. How to find the given device is whether MOSFET or IGBT?




RESULT:




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          TRANSIENT CHARACTERISTICS OF MOSFET AND SCR

CIRCUIT DIAGRAM:

FOR MOSFET




MATLAB CIRCUIT FOR MOSFET




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              TRANSIENT CHARACTERISTICS OF MOSFET AND SCR


AIM:
      (i) Obtain and explain both turning ‘ON’ and turn ‘OFF’ characteristics of
given SCR
      (ii) Obtain and explain both turning ‘ON’ and turn ‘OFF’ characteristics of
given MOSFET.

APPARATUS REQUIRED:

S.No.           Blocks                Type               Items               Quantity
  1   Simulink
      i. Sink                                          Scope                    1
      ii. Source                                   Pulse Generator              1
  2   Sim power system
                                        MC           Ammeter                    1
        i. Measurements
                                        MC           Voltmeter                  1
        ii. Elements                     -        RLC series branch             1
                                         -           MOSFET                     1
        iii. Power electronics
                                         -              SCR                     1
        iV. Electrical source            -           DC source                  1

PROCEDURE:

FOR MOSFET

   1. Open MATLAB and open Simulink then create a new file (new module)
   2. Connections are made as per the circuit diagram by taking the required items
       from the corresponding blocks.
   3. According to the MOSFET, we should give the block parameter for MOSFET,
       RLC series branch, pulse generator and the scope.
   4. Now simulate the circuit. The graph of Gate pulse, Drain current and drain to
       source voltage can be shown.
   5. Finally the print out of the MATLAB circuit and the output is taken.




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FOR SCR




MATLAB CIRCUIT FOR SCR




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FOR SCR

  1. Open MATLAB and open Simulink then create a new file (new module)
  2. Connections are made as per the circuit diagram by taking the required items
     from the corresponding blocks.
  3. According to the SCR, we should give the block parameter for SCR, RLC series
     branch, pulse generator and the scope.
  4. Now simulate the circuit. The graph of Gate pulse, Anode current and anode to
     cathode voltage can be shown.
  5. Finally the print out of the MATLAB circuit and the output is taken.




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MODEL GRAPH:

FOR MOSFET




FOR SCR




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INFERENCE:




DISCUSSION QUESTIONS:

1. What is MATLAB?
2. What is a transient characteristic?
3. What is commutation?
4. Where the natural commutation is not possible in SCR?
5. What is the function of scope in MATLAB?




RESULT:




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SINGLE PHASE AC TO DC FULLY CONTROLLED CONVERTER

             CIRCUIT DIAGRAM FOR R LOAD




                 Model graph for R Load
                          °
                   ( = 30°, R=100 )




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EE1303-Power Electronics Lab Manual


          SINGLE PHASE AC TO DC FULLY CONTROLLED CONVERTER
AIM:
       (i) To study the operation of single phase fully controlled bridge converter with R
and R-L loads for continuous and discontinuous conduction modes.
       (ii) Also find the performance parameters (Rectification efficiency, form factor,
peak inverse voltage and ripple factor)

APPARATUS REQUIRED:

S.No.         Name of the item                 Type                  Range             Quantity
  1     1 SCR bridge module                   TYN612               600V,12A               1
  2     SCR Triggering Kit                       -                      -                 1
  3     Ammeter                                 MC                (0-500) mA              1
  4     Voltmeter                               MC                  (0-30) V              1
  5     CRO                                      -                      -                 1
  6     CRO Brobe                                -                      -                 1
  7     Patch Cards                              -                      -                10

FORMULA USED:

   For R load
                                                         Vm
   1. Average dc output voltage Vdc is           Vdc =        (1 + cos )
                                                                                          1
                                                                   1           sin 2      2
   2. RMS output voltage is Vrms                 Vrms = Vm                 +
                                                                  2               2

   For R-L load continuous conduction:
                                                          2Vm
   1. Average dc output voltage Vdc is           Vdc =            cos

                                                          Vm
   2. RMS output voltage Vrms is                 Vrms =           = Vs
                                                              2
   For RL load discontinuous conduction:
                                                         Vm
   3. Average dc output voltage Vdc is           Vdc =        (cos       cos )
                                                                                                   1
                                                          V2               sin 2   sin 2           2
   4. RMS output voltage Vrms is                 Vrms   = m                      +
                                                          2                   2       2




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          CIRCUIT DIAGRAM FOR R-L LOAD




 Model graph for R-L Load with continuous conduction
                    °
             ( = 30°, R=100 , L=200mH)




Model graph for R-L Load with discontinuous conduction
                     °
              ( = 90°, R=100 , L=200mH)




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  General Formula:
                                                          2
                                                        Vdc
  5. Rectification efficiency                     % =    2
                                                       Vrms
                                                       V
  6. Form factor                                  FF = rms
                                                       Vdc
  7. Peak inverse voltage                         PIV = Vm
  8. Ripple factor                                RF = FF 2 1

Where
        Vm = maximum or peak voltage in volts =    2Vs
        Vs = Supply voltage in volts
           = Firing angle
           = Extinction angle
          = Conduction angle = -

Procedure:

  1. Connections are made as per the circuit diagram for R load
  2. Switch on the triggering kit
  3. Switch on the 230 V AC supply
  4. Switch on the debounce logic
  5. By varying potentiometer vary the firing angle of the converter in order to vary the
     output voltage step by step.
  6. For each step note down the firing angle, output voltage and load current.
  7. The output voltage is theoretically calculated for each step and the readings are
     tabulated.
  8. Repeat the same procedure for RL load.




                  Muthayammal Engineering college, Rasipuram.                  37
EE1303-Power Electronics Lab Manual


Tabulation for R load:

                                               Vs=                 R=

S.No.   Firing Angle     Idc Measured   Vdc Measured   Vdc Calculated   Vrms Calculated
           in degree     in milliamps      in volts        in volts         in volts




Tabulation for RL load:
                                  Vs=          R=             L=           =

S.No.   Firing Angle     Idc Measured Vdc Measured Vdc Calculated       Vrms Calculated
           in degree     in milliamps      in volts      in volts           in volts
                                   Continuous conduction




                                Discontinuous conduction




                Muthayammal Engineering college, Rasipuram.                    38
EE1303-Power Electronics Lab Manual


INFERENCE:




DISCUSSION QUESTIONS:

  1.   What is inversion mode of operation?
  2.   When we connect a freewheeling diode in full converter, what will be the output?
  3.   Why the inversion mode is not possible in semi converter?
  4.   Why the power factor of full converter is lower than semi converter?
  5.   What is , , and µ?




RESULT:




                 Muthayammal Engineering college, Rasipuram.                   39
EE1303-Power Electronics Lab Manual


SINGLE PHASE AC TO DC HALF CONTROLLED CONVERTER


             CIRCUIT DIAGRAM FOR R LOAD




                 Model graph for R Load
                          °
                   ( = 30°, R=100 )




    Muthayammal Engineering college, Rasipuram.                40
EE1303-Power Electronics Lab Manual


           SINGLE PHASE AC TO DC HALF CONTROLLED CONVERTER

AIM:
       (i) To study the operation of single phase semi converter with R and R-L loads for
continuous and discontinuous conduction modes.
       (ii) Also find the performance parameters (Rectification efficiency, form factor,
peak inverse voltage and ripple factor)

APPARATUS REQUIRED:

S.No.          Name of the item                Type              Range         Quantity
  1     SCR module with protection           TYN612            600V,12A           2
  2     Diode module with protection          BY126                 -             3
  3     SCR Triggering Kit                       -                  -             1
  4     Battery                                  -                12V             1
  5     Ammeter                                 MC            (0-500) mA          1
  6     Voltmeter                               MC              (0-30) V          1
  7     CRO                                      -                  -             1
  8     CRO Brobe                                -                  -             1
  9     Patch Cards                              -                  -            10

FORMULA USED:

   For R and RL load continuous & discontinuous conduction:
                                               V
   1. Average dc output voltage Vdc is    Vdc = m (1 + cos )
                                                                                  1
                                                               1       sin 2      2
   2. RMS output voltage is Vrms                  Vrms = Vm          +
                                                              2           2
   General Formula:
                                                          2
                                                        Vdc
   3. Rectification efficiency                    % = 2
                                                       Vrms
                                                       V
   4. Form factor                                 FF = rms
                                                       Vdc
   5. Peak inverse voltage                        PIV = Vm
   6. Ripple factor                               RF = FF 2 1

Where
        Vm = maximum or peak voltage in volts =     2Vs
        Vs = Supply voltage in volts
           = Firing angle
           = Extinction angle
          = Conduction angle = -

                  Muthayammal Engineering college, Rasipuram.                         41
EE1303-Power Electronics Lab Manual


          CIRCUIT DIAGRAM FOR R-L LOAD




 Model graph for R-L Load with continuous conduction
                    °
             ( = 30°, R=100 , L=100mH)




Model graph for R-L Load with discontinuous conduction
                     °
              ( = 90°, R=100 , L=100mH)




   Muthayammal Engineering college, Rasipuram.                42
EE1303-Power Electronics Lab Manual


Procedure:

  1. Connections are made as per the circuit diagram for RL load
  2. Switch on the triggering kit
  3. Switch on the 230V AC supply
  4. Switch on the debounce logic
  5. By varying potentiometer vary the firing angle of the converter in order to vary the
     output voltage step by step.
  6. For each step note down the firing angle, output voltage and load current.
  7. The output voltage is theoretically calculated for each step and the readings are
     tabulated.
  8. Repeat the same procedure for RL load.




                  Muthayammal Engineering college, Rasipuram.                  43
EE1303-Power Electronics Lab Manual


Tabulation for R load:

                                               Vs=                 R=

S.No.   Firing Angle     Idc Measured   Vdc Measured   Vdc Calculated   Vrms Calculated
           in degree     in milliamps      in volts        in volts         in volts




Tabulation for RL load:


S.No.   Firing Angle     Idc Measured Vdc Measured Vdc Calculated       Vrms Calculated
           in degree     in milliamps      in volts      in volts           in volts
                                   Continuous conduction




                                Discontinuous conduction




                Muthayammal Engineering college, Rasipuram.                   44
EE1303-Power Electronics Lab Manual


INFERENCE:




DISCUSSION QUESTIONS:

1. What is power electronics?
2. What are the types of converter in power electronics?
3. What is firing angle?
4. What is active load?
5. Why the negative voltage is not possible in semi converter?
6. What is freewheeling diode?
7. Is a separate freewheeling diode necessary for semi converter? Justify your answer.




RESULT:




                 Muthayammal Engineering college, Rasipuram.                  45
EE1303-Power Electronics Lab Manual


                  STEP DOWN MOSFET BASED CHOPPER



CIRCUIT DIAGRAM




MODEL GRAPH




              Muthayammal Engineering college, Rasipuram.                46
EE1303-Power Electronics Lab Manual


                           STEP DOWN MOSFET BASED CHOPPER
AIM:
       To study the waveform for MOSFET based step down chopper for different load
for continuous and discontinuous conduction modes.

APPARATUS REQUIRED:

S.No.          Name of the item                    Type                 Range     Quantity
  1      MOSFET Module                            IRF 840                   -        1
  2      Ammeter                                    MC                (0-500mA)      1
  3      Voltmeter                                  MC                  (0-30V)      1
  4      Rheostat                                    -                      -        1
  5      RPS                                         -                  (0-30V)      1
  6      CRO                                         -                      -        1
  7      CRO Probe                                   -                      -        1
  8      Patch cards                                 -                      -        -


FORMULA USED:

   1. Average dc output voltage Vdc is               Vdc = Vs
   2. RMS output voltage Vrms is                     Vrms =      Vs

   Where:
                                                           TON
       = Duty cycle of the chopper                     =
                                                            T
   TON = on time
   T = Total time

Procedure:

   1. Connections are made as per the circuit diagram.
   2. Switch on the RPS and turn on triggering kit
   3. Switch on the debounce logic
   4. By changing the width of the pulse, obtain the different set of reading.
   5. For each step note down the duty cycle, output voltage and load current and
        tabulate it.
   6. The output voltage is theoretically calculated.
   7. Draw the graph as per the reading in the table.




                       Muthayammal Engineering college, Rasipuram.                    47
EE1303-Power Electronics Lab Manual



TABULATION:
                                    Vs=               T=

S.No.    TON                  TON         Idc (Avg)        Vdc (Avg)      Vdc (Avg)
        in ms             =               Measured         Measured       Calculated
                               T
                                           in mA            in volts        in volts
                                                                           Vdc = Vs
 1
 2
 3
 4
 5




                Muthayammal Engineering college, Rasipuram.                   48
EE1303-Power Electronics Lab Manual


INFERENCE:




DISCUSSION QUESTIONS:

  1.   What is chopper and what are the devices generally used for chopper?
  2.   What are the types of chopper?
  3.   What is step down chopper?
  4.   What are the control strategies used for choppers?
  5.   Why frequency modulation is not preferred mostly?
  6.   Why thyristor is not preferred in chopper circuit mostly?




RESULT:




                 Muthayammal Engineering college, Rasipuram.                  49
EE1303-Power Electronics Lab Manual


                   STEP UP MOSFET BASED CHOPPER


CIRCUIT DIAGRAM:




                    Model graph for step up operation




            Muthayammal Engineering college, Rasipuram.                50
EE1303-Power Electronics Lab Manual


                             STEP UP MOSFET BASED CHOPPER

AIM:
       To study the waveform for MOSFET based step up chopper for different load for
continuous and discontinuous conduction modes.

APPARATUS REQUIRED:

S.No.           Name of the item                   Type               Range     Quantity
  1      MOSFET Module                           IRF 840                  -        1
  2      Ammeter                                    MC              (0-500mA)      1
  3      Voltmeter                                  MC                (0-30V)      1
  4      Rheostat                                     -                   -        1
  5      RPS                                          -               (0-30V)      1
  6      Diode                                    Py 127                  -        1
  7      Inductor                               Ferrite core          100mH        1
  8      CRO                                          -                   -        1
  9      CRO Probe                                    -                   -        1
 10      Patch cards                                  -                   -        -

FORMULA USED:

                                                               Vs
   Average dc output voltage Vdc is                  Vdc =
                                                             (1     )
   Where:
                                                           TON
       = Duty cycle of the chopper                     =
                                                            T
   TON = on time
   T = Total time

PROCEDURE:

   1. Connections are made as per the circuit diagram
   2. Switch on the RPS and turn on triggering kit
   3. Switch on the debounce logic
   4. By changing the width of the pulse, obtain the different set of reading.
   5. For each step note down the duty cycle, output voltage and load current and
        tabulate it.
   6. The output voltage is theoretically calculated for each step.
   7. Draw the graph as per the reading in the table.



                       Muthayammal Engineering college, Rasipuram.                  51
EE1303-Power Electronics Lab Manual



TABULATION:
                                             Vs=                       T=


S.No.    TON                  TON      Idc (Avg)       Vdc (Avg)        Vdc (Avg)
        in ms             =            Measured        Measured        Calculated
                               T
                                        in mA           in volts         in volts
                                                                               Vs
                                                                       Vdc =
                                                                             (1 )
 1
 2
 3
 4
 5




                Muthayammal Engineering college, Rasipuram.                 52
EE1303-Power Electronics Lab Manual


INFERENCE:




DISCUSSION QUESTIONS:

  1.   What is chopper and what are the devices generally used for chopper?
  2.   What are the types of chopper?
  3.   What is step up chopper?
  4.   What are the control strategies used for choppers?
  5.   Why frequency modulation is not preferred mostly?
  6.   Why thyristor is not preferred in chopper circuit mostly?




RESULT:




                 Muthayammal Engineering college, Rasipuram.                  53
EE1303-Power Electronics Lab Manual


 IGBT BASED SINGLE PHASE PWM INVERTER




                CIRCUIT DIAGRAM




Muthayammal Engineering college, Rasipuram.                54
EE1303-Power Electronics Lab Manual


                    IGBT BASED SINGLE PHASE PWM INVERTER

AIM:
      To study the operation of single-phase bridge inverter with sinusoidal pulse width
modulation with R load.

APPARATUS REQUIRED:

S.No.           Name of the item              Type            Range      Quantity
  1      IGBT Module                            -                -          1
  2      Inverter control module                -                -          1
  3      CRO                                    -                -          1
  4      Ammeter                               MI             (0-5A)        1
  5      Voltmeter                             MI            (0-300V)       1
  6      Patch cards                            -                -          -

FORMULA USED:

   1. Modulation index (m) is                  m = Ar / Ac

   2. Output voltage                           V0 = m Vs

Where
     Ar = Amplitude of reference signal
        Ac = Amplitude of carrier signal
        Vs = Source voltage




                  Muthayammal Engineering college, Rasipuram.                  55
EE1303-Power Electronics Lab Manual


                   Model graph

       Sinusoidal Pulse width modulation




         Voltage and current waveforms




Muthayammal Engineering college, Rasipuram.                56
EE1303-Power Electronics Lab Manual


Precaution:

  1. Check whether AC main switch is off condition in both the trainer.
  2. Check whether control module mode selector switch is in first position (Sine
     wave).
  3. Check whether control module pulse release switch SW4 in control module is off
     position.
  4. Check whether 24V AC switch is in off position.
Procedure:
  1. Make the connection as per the circuit diagram.
  2. Switch on the AC main in both the trainer.
  3. Measure the amplitude and frequency of sine wave and carrier triangular wave
     and tabulate it. Also adjust sine wave frequency to 50Hz.
  4. Connect CRO probe to observe the load voltage and load current waveform.
  5. Release the switch SW4 in the inverter control module and switch SW1 in the
     IGBT power module.
  6. Measure the output voltage.
  7. Using the amplitude POT to vary step by step, for each step note down the
     amplitude and frequency of sine wave and triangular waveform and also
     measure the output voltage and tabulate it.
  8. Then find the theoretical output voltage by using the formula.




                 Muthayammal Engineering college, Rasipuram.                 57
EE1303-Power Electronics Lab Manual


Tabulation:

                                                  Vs=

S.No. Amplitude Amplitude Modulation     I0       V0                      V0
      of carrier     of     index    Measured Measured               Calculated
      triangular reference m= Ar/Ac  in Amps   in Volts               in Volts
         wave    sine wave                                           V0 = m X V s
        (Ac) in    (Ar) in
         volts      volts
  1
  2
  3
  4
  5
  6




              Muthayammal Engineering college, Rasipuram.                58
EE1303-Power Electronics Lab Manual




INFERENCE:




DISCUSSION QUESTIONS:

  1.   What is inverter?
  2.   Why we go for PWM?
  3.   What are the different types of PWM?
  4.   What is modulation index and what are the types?
  5.   What are the advantages of IGBT?




RESULT:




                 Muthayammal Engineering college, Rasipuram.                59
EE1303-Power Electronics Lab Manual


                   SERIES RESONANT DC-DC CONVERTER
                       (ZERO CURRENT SWITCHING)

CIRCUIT DIAGRAM:




MODEL GRAPH:




            Muthayammal Engineering college, Rasipuram.                60
EE1303-Power Electronics Lab Manual


                      SERIES RESONANT DC-DC CONVERTER
                          (ZERO CURRENT SWITCHING)

AIM:

      To determine the voltage and current wave form of series resonant dc-dc
converter (Zero current switching).

APPARATUS REQUIRED:

S.No.          Name of the item               Type           Range        Quantity
  1      Resonant converter module          VPET-315            -            1
  2      Ammeter                               MC            (0-2) A         1
  3      Voltmeter                             MC           (0-30) V         1
  4      CRO                                    -               -            1
  5      CRO Brobe                              -               -            1
  6      Patch Cards                            -               -           10

FORMULA USED:
             1
Frequency f = Hz
             T
Where:

T= Time
f = Frequency

PRECAUTIONS:

        Initially keep the frequency adjustment POT in minimum position

PROCEDURE:

   1. Connections are made as per the circuit diagram.
   2. Initially keep frequency adjustment POT in minimum position.
   3. Switch on the main supply
   4. Connect the “P” Pin connector from PWM output and PWM input
   5. Connect the banana connector P10 to P4 , P8 to P11
   6. Connect the current sensing resistor (1   / 20 W) across the banana connector P2
        to P3.
   7. The voltmeter is connected across P5 and P12




                  Muthayammal Engineering college, Rasipuram.                 61
EE1303-Power Electronics Lab Manual



TABULATION:


                        Switching
                                          Output             Output
 S.No.   Time (ms)      Frequency
                                        Voltage (V)         Current (A)
                          (KHz)
   1

   2

   3

   4

   5




              Muthayammal Engineering college, Rasipuram.                 62
EE1303-Power Electronics Lab Manual


   8. Connected the R load across P5 and P12 through ammeter.
   9. Adjust the frequency POT and set switching frequency 40KHz.
   10. Connect the CRO across the connector T1 (+) and ground. Another channel is
      connected to P2 (+), P3 (-)
   11. Now observe the switch voltage and current wave.
   12. Similarly observe the switch voltage and current waveform for various switching
      frequency.

INFERENCE:




DISCUSSION QUESTIONS:

1. What is resonance?
2. What is the condition for resonance?
3. What are the advantages of resonant converter?
4. What is soft switching?
5. What types of resonant converter?
6. What is zero current switching?
7. What is zero voltage switching?




RESULT:




                 Muthayammal Engineering college, Rasipuram.                  63
EE1303-Power Electronics Lab Manual


               PARALLEL RESONANT DC-DC CONVERTER
                    (ZERO VOLTAGE SWITCHING)


CIRCUIT DIAGRAM:




MODEL GRAPH:




            Muthayammal Engineering college, Rasipuram.                64
EE1303-Power Electronics Lab Manual


                    PARALLEL RESONANT DC-DC CONVERTER
                         (ZERO VOLTAGE SWITCHING)

AIM:

      To determine the voltage and current wave form of parallel resonant dc-dc
converter (Zero voltage switching).

APPARATUS REQUIRED:

S.No.          Name of the item               Type           Range        Quantity
  1      Resonant converter module          VPET-315            -            1
  2      Ammeter                               MC            (0-2) A         1
  3      Voltmeter                             MC           (0-30) V         1
  4      CRO                                    -               -            1
  5      CRO Brobe                              -               -            1
  6      Patch Cards                            -               -           10


FORMULA USED:
             1
Frequency f = Hz
             T
Where:

T= Time
f = Frequency

PRECAUTIONS:

        Initially keep the frequency adjustment POT in minimum position

PROCEDURE:

   1. Connections are made as per the circuit diagram.
   2. Initially keep frequency adjustment POT in minimum position.
   3. Switch on the main supply
   4. Connect the “9” Pin connector from PWM output and PWM input
   5. Connect the banana connector P10 to P4, P8 to P11
   6. Connect the current sensing resistor (1   / 20 W) across the banana connector P2
        to P3.
   7. The voltmeter is connected across P5 and P12


                  Muthayammal Engineering college, Rasipuram.                 65
EE1303-Power Electronics Lab Manual




TABULATION:


                        Switching
                                          Output             Output
 S.No.   Time (ms)      Frequency
                                        Voltage (V)         Current (A)
                          (KHz)
   1

   2

   3

   4

   5




              Muthayammal Engineering college, Rasipuram.                 66
EE1303-Power Electronics Lab Manual



   8. Connected the R load across P5 and P12 through ammeter.
   9. Adjust the frequency POT and set switching frequency 40KHz.
   10. Connect the CRO across the connector T1 (+) and ground. Another channel is
      connected to P2 (+), P3 (-)
   11. Now observe the switch voltage and current wave.
   12. Similarly observe the switch voltage and current waveform for various switching
      frequency.

INFERENCE:




DISCUSSION QUESTIONS:

1. What is resonance?
2. What is the condition for resonance?
3. What are the advantages of resonant converter?
4. What is soft switching?
5. What types of resonant converter?
6. What is zero current switching?
7. What is zero voltage switching?




RESULT:




                 Muthayammal Engineering college, Rasipuram.                  67

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Power Electronics lab manual BE EEE

  • 1. EE1303-Power Electronics Lab Manual MUTHAYAMMAL ENGINEERING COLLEGE, RASIPURAM Department of Electrical and Electronics Engineering V Semester – BE (EEE) EE 1303 - Power Electronics Laboratory Manual Prepared by Approved by Prof.M.Muruganandam, M.E.,(Ph.D), Dr P.Murugesan,B.E.,Ph.D., AP/ EEE Proff. & HOD/EEE Revision No.:1 Date:24.06.2008 Muthayammal Engineering college, Rasipuram. 1
  • 2. EE1303-Power Electronics Lab Manual Muthayammal Engineering college, Rasipuram. 2
  • 3. EE1303-Power Electronics Lab Manual INSTRUCTIONS TO THE CANDIDATE SAFETY: You are doing experiments in Power Electronics lab with high voltage and high current electric power. It may cause even a fatal or loss of energy of your body system. To avoid this please keep in mind the followings In case of any wrong observations, you have to SWITCH OFF the power supply related with it. You have to tuck in your shirts or wear an overcoat. You have to wear shoes compulsorily and stand on mats made by insulating materials to electrically isolate your body from the earth. ATTENDANCE: If you absent for a lab class then you have lost several things to learn. Laboratory should be treated as temple, which will decide your life. So don’t fail to make your presence with your record notebook having completed experiments, observation with completed experiments, day’s experiment particulars with required knowledge about it and stationeries. MAKING CONNECTIONS: Get circuit diagram approval from your staff in charge. Go to the respective worktable and start to give connection as per the circuit diagram from source side. Make series circuit connections before the parallel circuits like voltmeter connections. Before switch on the power, get circuit connection approval from the staff in charge. DOING EXPERIMENT: Start the experiment in the presence of an instructor / staff in-charge and do the same by proper procedure. If staff permits you then precede your experiment. OBSERVATION: Before take the wave forms calibrate the CRO. Note all the required readings in their respective tables. Note all the wave forms from the CRO. CALCULATION: Calculate the required quantities by suitable formulae and tabulate them with units. Draw the necessary graphs and write the result with reference. Get verification of observation and calculation from your staff in charge. RECORD: Muthayammal Engineering college, Rasipuram. 3
  • 4. EE1303-Power Electronics Lab Manual Shows the performance of equipment and yourself. It will be very useful for future reference. So keep it as follows. Write neatly; as they have to be preserved enter the readings in the record notebook those have been written in your observation. Units should be written for all quantities. Draw necessary graphs and complete the record before coming to the next lab class. Don’t forget to write the theory with precaution and inference of each experiment. MAY I HELP YOU 1. Device ratings should be noted. 2. Moving coil meters should be used for DC measurements. 3. Moving iron meters should be used for AC measurements. 4. Use isolated supply for the CRO. 5. Use attenuation probe for high voltage measurements in CRO. Muthayammal Engineering college, Rasipuram. 4
  • 5. EE1303-Power Electronics Lab Manual CONTENTS Sl.No. Name of the experiment Page No. 1. VI CHARACTERISTICS OF SCR 2 2. VI CHARACTERISTICS OF TRIAC 8 3. VI CHARACTERISTICS OF MOSFET 14 4. VI CHARACTERISTICS OF IGBT 20 5. TRANSIENT CHARACTERISTICS OF MOSFET AND SCR 24 6. SINGLE PHASE AC TO DC FULLY CONTROLLED CONVERTER 30 7. SINGLE PHASE AC TO DC HALF CONTROLLED CONVERTER 36 8. STEP DOWN MOSFET BASED CHOPPER 42 9. STEP UP MOSFET BASED CHOPPER 46 10. IGBT BASED SINGLE PHASE PWM INVERTER 50 SERIES RESONANT DC-DC CONVERTER 11. 56 (ZERO CURRENT SWITCHING) PARALLEL RESONANT DC-DC CONVERTER 12. 60 (ZERO VOLTAGE SWITCHING) Muthayammal Engineering college, Rasipuram. 5
  • 6. EE1303-Power Electronics Lab Manual VI CHARACTERISTICS OF SCR CIRCUIT DIAGRAM: VI Characteristics 1 Half wave Rectifier Triggering Circuit for 1 Half wave Rectifier Muthayammal Engineering college, Rasipuram. 6
  • 7. EE1303-Power Electronics Lab Manual VI CHARACTERISTICS OF SCR AIM: (i) To Conduct an experiment and obtain the anode forward conduction characteristics of the given SCR also find the latching and holding currents of the given SCR. (ii) To Demonstrate how a single-phase half wave rectifier circuit can be implemented using a given SCR, AC power source and RC firing circuit. APPARATUS REQUIRED: S.No. Name of the item Type Range Quantity 1 SCR module TYN612 600V,12A 1 2 Ammeter MC (0-100) mA 1 3 Ammeter MC (0-50) mA 1 4 Voltmeter MC (0-30) V 1 5 Digital Multimeter - - 1 6 RC Firing Module - - 1 7 Rheostat - 220 1 8 CRO - - 1 9 CRO probe - - 1 10 Patch Cards - - 10 FORMULA USED: Vm 1. Average dc output voltage Vdc is Vdc = (1 + cos ) 1 V 1 sin 2 2 2. RMS output voltage is Vrms Vrms = m + 2 2 2 Vdc 3. Rectification efficiency % = 2 Vrms V 4. Form factor FF = rms Vdc 5. Peak inverse voltage PIV = Vm 6. Ripple factor RF = FF 2 1 1 1 sin 2 2 7. Power factor PF = + 2 2 Where Vm = maximum or peak voltage in volts = 2Vs Vs = Supply voltage in volts = Firing angle = Extinction angle = Conduction angle = - Muthayammal Engineering college, Rasipuram. 7
  • 8. EE1303-Power Electronics Lab Manual MODEL GRAPH: VI CHARACTERISTICS OF SCR 1 HALF WAVE RECTIFIER Muthayammal Engineering college, Rasipuram. 8
  • 9. EE1303-Power Electronics Lab Manual PRECAUTION: 1. The initial set gate current should be taken as minimum in order to take the consecutive readings. 2. Maximum anode current, anode-cathode voltage and gate current limit is 600mA, 30V and 20mA respectively 3. Before setting each gate current, keep the Anode to cathode voltage (VAK) as zero. PROCEDURE: VI Characteristics: 1. Connections are made as per the circuit diagram. 2. Switch on the 230V AC supply through three-pin power chord. 3. Keep the gate current (IG) to a suitable value (say minimum of 4 mA to 5mA) 4. Now slowly increase the anode-cathode voltage (VAK) by varying the pot till thyristor get turned on, with the indication that anode cathode voltage decreases to it on state voltage drop (i.e 0.7V) and the anode current increases. 5. Note the values of voltmeter (VAK) which is the break over voltage and the ammeter (I L) which is the latching current value. 6. Further, increase the anode current in steps by varying the anode-cathode voltage and note the readings. 7. Now reduces the anode cathode voltage (VAK) till the thyristor turned off and find the holding current. 8. For various gate current take the readings and tabulate it. 9. Finally, a graph of anode current Vs anode-cathode voltage is plotted for various gate current. Muthayammal Engineering college, Rasipuram. 9
  • 10. EE1303-Power Electronics Lab Manual TABULATION: VI Characteristics: IG1 = IG2 = IG3 = S.No. VAK(V) IA(mA) VAK(V) IA(mA) VAK(V) IA(mA) 1 2 3 4 5 6 1 HALF WAVE RECTIFIER: Firing Practical Practical Theoretical Theoretical S.NO. angle ° Vavg (V) Iavg (A) Vavg (V) Vrms 1 2 3 4 5 6 Muthayammal Engineering college, Rasipuram. 10
  • 11. EE1303-Power Electronics Lab Manual 1 HALF WAVE RECTIFIER: 1. Connections are made as per the circuit diagram. 2. Switch on the triggering circuit 3. Switch on the 24V AC supply 4. By varying potentiometer, vary the firing angle of the converter in order to vary the output voltage step by step. 5. For each step note down the firing angle, output voltage and load current. 6. The output voltage is theoretically calculated for each step and the readings are tabulated. INFERENCE: DISCUSSION QUESTIONS: 1. What is power electronics? 2. What are the types of converter in power electronics? 3. What is latching and holding current? 4. What is break over voltage? 5. What is forward bias and reverse bias? 6. What is firing angle? 7. Why the negative voltage is not possible in semi converter? 8. What is freewheeling diode? RESULT: Muthayammal Engineering college, Rasipuram. 11
  • 12. EE1303-Power Electronics Lab Manual VI CHARACTERISTICS OF TRIAC CIRCUIT DIAGRAM: VI Characteristics Single-phase A.C phase controller for illumination control Muthayammal Engineering college, Rasipuram. 12
  • 13. EE1303-Power Electronics Lab Manual VI CHARACTERISTICS OF TRIAC AIM: (i) To obtain the forward and reverse conduction characteristics of the given TRIAC also find the latching and holding currents of the given TRIAC. (ii) To demonstrate how a single- phase AC phase controller can be implemented for controlling the illumination of lamp, using given TRIAC and RC triggering circuit and draw the voltage wave form across the lamp. APPARATUS REQUIRED: S.No. Name of the item Type Range Quantity 1 TRIAC module BTA 12 600V,12A 1 2 Ammeter MC (0-100) mA 1 3 Ammeter MC (0-50) mA 1 4 Voltmeter MC (0-30) V 1 5 Voltmeter MI (0-300)V 1 6 Ammeter MI (0-500)mA 1 7 Digital Multimeter - - 1 8 Transformer - 230/12V 1 9 CRO - - 1 10 CRO Probe - - 1 11 Patch Cards - - 10 FORMULA USED: 1 1 Sin2 2 The RMS output voltage is V0 RMS = Vs + 2 Where = Firing angle Vs = Source voltage PRECAUTION: 1. The initial set gate current should be taken as the value, for gate current for the consecutive readings. 2. Maximum triac current, voltage across the triac and gate current limit is 600mA, 30V and 20mA respectively. 3. To see the phase controlled converter output waveform, use a 230 / 12 V transformer for isolation purpose. Muthayammal Engineering college, Rasipuram. 13
  • 14. EE1303-Power Electronics Lab Manual MODEL GRAPH: VI CHARACTERISTICS OF TRIAC Single-phase A.C phase controller for illumination control Muthayammal Engineering college, Rasipuram. 14
  • 15. EE1303-Power Electronics Lab Manual PROCEDURE: VI Characteristics: 1. Connections are made as per the circuit diagram with MT1 +Ve with respect to MT2. 2. Switch on the 230V AC supply through three-pin power chord. 3. Keep the gate current (IG) to a suitable value (say minimum of 4 mA to 5mA) 4. Now slowly increase the anode-cathode voltage (VAK) by varying the pot till Triac get turned on, with the indication that anode cathode voltage decreases to it’s on state voltage drop (i.e 0.7V) and the anode current increases. 5. Note the values of voltmeter (VAK) which is the break over voltage and the ammeter (I L) which is the latching current value. 6. Further, increase the anode current in steps by varying the anode-cathode voltage and note the readings. 7. Now reduces the anode cathode voltage (VAK) till the triac turned off and find the holding current. 8. For various gate current take the readings and tabulate it. 9. Connect MT2 terminal of Triac is + Ve with respect to MT1 10. Repeat the same procedure from 2 to 8 11. Finally, a graph of anode current Vs anode-cathode voltage is plotted for various gate current for forward and reverse biases. Single-phase A.C phase controller for illumination control 1. Connections are made as per the circuit diagram. 2. Switch on the 230 V, 50 Hz AC supply 3. By varying potentiometer, vary the firing angle of the converter in order to vary the output voltage there by the illumination of the lamp will be varied. 4. For each step note down the firing angle, ammeter reading, voltmeter reading and the output voltage waveform from and tabulate it. 5. Finally, the output voltage waveform is plotted and the theoretical RMS voltage is calculated. Muthayammal Engineering college, Rasipuram. 15
  • 16. EE1303-Power Electronics Lab Manual TABULATION: VI Characteristics: MT1 is + Ve with respect to MT2 IG1 = IG2 = IG3 = S.No. VAK(V) IA(mA) VAK(V) IA(mA) VAK(V) IA(mA) 1 2 3 4 5 MT2 is + Ve with respect to MT1 IG1 = IG2 = IG3 = S.No. VAK(V) IA(mA) VAK(V) IA(mA) VAK(V) IA(mA) 1 2 3 4 5 Single-phase A.C phase controller S.No. Firing angle ( ) in I0RMS Measured V0RMS Measured V0RMS Calculated degree in Amps in Volts in Volts 1 2 3 4 5 Muthayammal Engineering college, Rasipuram. 16
  • 17. EE1303-Power Electronics Lab Manual INFERENCE: DISCUSSION QUESTIONS: 1. What is bidirectional device? 2. What is bipolar device? 3. What are the applications of phase controlled converter in home appliances? 4. What is the number and range of given triac? 5. What type of firing is used here? 6. How do you change the firing angle? 7. Draw the symbol of Triac. RESULT: Muthayammal Engineering college, Rasipuram. 17
  • 18. EE1303-Power Electronics Lab Manual VI CHARACTERISTICS OF MOSFET CIRCUIT DIAGRAM: VI CHARACTERISTICS Muthayammal Engineering college, Rasipuram. 18
  • 19. EE1303-Power Electronics Lab Manual VI CHARACTERISTICS OF MOSFET AIM: (i) Obtain the steady – state output – side characteristics and transfer characteristics of the given MOSFET, for a specified value of gate – source voltage. (ii) Identify whether given switch is MOSFET or IGBT by finding the output– side characteristics. APPARATUS REQUIRED: S.No. Name of the item Type Range Quantity 1 MOSFET module IRF 840 600V,5A 1 2 Ammeter MC (0-100) mA 1 3 Voltmeter MC (0-10)V 1 4 Voltmeter MC (0-30) V 1 5 CRO - - 1 6 CRO Probe - - 1 7 Patch Cards - - 10 FORMULA USED: ID 1. Trans conductance Gm = mho VDS V DS 2. Output resistance RDS = ohm ID Where: ID = Change in drain current. VDS = Change in drain to source voltage PRECAUTION: The initial set gate voltage should be taken as minimum in order to take the consecutive readings. PROCEDURE: DRAIN CHARACTERISTICS 1. Connections are made as per the circuit diagram 2. Switch on the 230V AC supply through three-pin power chord. Muthayammal Engineering college, Rasipuram. 19
  • 20. EE1303-Power Electronics Lab Manual MODEL GRAPH: DRAIN CHARACTERISTICS TRANSFER CHARACTERISTICS Muthayammal Engineering college, Rasipuram. 20
  • 21. EE1303-Power Electronics Lab Manual 3. Keep the gate - source voltage (VGS) to a suitable value (say minimum of 6V to 7V) 4. Now slowly increase the drain-source voltage (VDS) by varying the pot till MOSFET get turned on, with the indication that drain-source voltage decreases to it on state voltage drop. 5. Note down the values of drain-source voltage (VDS) and the drain current (I D) 6. For various gate-source voltage take the different set of readings and tabulate it. 7. Finally, a graph of drain-source voltage (VDS) Vs drain current (ID) is plotted for various gate-source voltage. TRANSFER CHARACTERISTICS 1. Connections are made as per the circuit diagram 2. Switch on the 230V AC supply through three-pin power chord. 3. Keep the Drain - source voltage (VDS) to a suitable value 4. Now slowly increase the gate - source voltage (VGS) by varying the pot till MOSFET get turned on, with the indication that drain current getting constant value. 5. Note down the values of gate-source voltage (VGS) and the drain current (I D) 6. Finally, a graph of gate - source voltage (VGS) Vs drain current (ID) is plotted. Muthayammal Engineering college, Rasipuram. 21
  • 22. EE1303-Power Electronics Lab Manual TABULATION: Drain Characteristics: VGS1 = VGS2 = VGS3 = S.No. VDS(V) ID(mA) VDS(V) ID(mA) VDS(V) ID(mA) 1 2 3 4 5 Transfer Characteristics: VDS = VGS(V) S.No. ID(mA) 1 2 3 4 5 Muthayammal Engineering college, Rasipuram. 22
  • 23. EE1303-Power Electronics Lab Manual INFERENCE: DISCUSSION QUESTIONS: 1. What is current control device? 2. What is voltage control device? 3. What is the number and range of given MOSFET? 4. Draw the symbol of MOSFET? 5. What is Transconductance? 6. How to find the output resistance? RESULT: Muthayammal Engineering college, Rasipuram. 23
  • 24. EE1303-Power Electronics Lab Manual VI CHARACTERISTICS OF IGBT CIRCUIT DIAGRAM: VI CHARACTERISTICS MODEL GRAPH: Muthayammal Engineering college, Rasipuram. 24
  • 25. EE1303-Power Electronics Lab Manual VI CHARACTERISTICS OF IGBT AIM: (i) Obtain the steady – state output – side characteristics and transfer characteristics of the given IGBT, for a specified value of gate – source voltage. (ii) Identify whether given switch is MOSFET or IGBT by finding the output– side characteristics. APPARATUS REQUIRED: S.No. Name of the item Type Range Quantity 1 IGBT module IRGBC 600V,10A 1 2 Ammeter MC (0-100) mA 1 3 Voltmeter MC (0-10)V 1 4 Voltmeter MC (0-30) V 1 5 CRO - - 1 6 CRO Probe - - 1 7 Patch Cards - - 10 FORMULA USED: IC 1. Trans conductance Gm = mho VCE VCE 2. Output resistance RCE = ohm IC Where: IC = Change in collector current. VCE = Change in collector to emitter voltage PRECAUTION: The initial set gate voltage should be taken as minimum in order to take the consecutive readings. PROCEDURE: DRAIN CHARACTERISTICS 1. Connections are made as per the circuit diagram 2. Switch on the 230V AC supply through three-pin power chord. 3. Keep the gate - emitter voltage (VGE) to a suitable value (say minimum of 6V to 7V) Muthayammal Engineering college, Rasipuram. 25
  • 26. EE1303-Power Electronics Lab Manual TABULATION: VGE1 = VGE2 = VGE3 = S.No. VCE(V) IC(mA) VCE(V) IC(mA) VCE(V) IC(mA) 1 2 3 4 5 Muthayammal Engineering college, Rasipuram. 26
  • 27. EE1303-Power Electronics Lab Manual 4. Now slowly increase the drain-source voltage (VDS) by varying the pot till MOSFET get turned on, with the indication that drain-source voltage decreases to it on state voltage drop. 5. Note down the values of drain-source voltage (VDS) and the drain current (I D) 6. For various gate-source voltage take the different set of readings and tabulate it. 7. Finally, a graph of drain-source voltage (VDS) Vs drain current (ID) is plotted for various gate-source voltage. INFERENCE: DISCUSSION QUESTIONS: 1. What is current control device? 2. What is voltage control device? 3. What is the number and range of given IGBT? 4. Draw the symbol of IGBT? 5. What are differences between Transistor, MOSFET and IGBT? 6. How to find the given device is whether MOSFET or IGBT? RESULT: Muthayammal Engineering college, Rasipuram. 27
  • 28. EE1303-Power Electronics Lab Manual TRANSIENT CHARACTERISTICS OF MOSFET AND SCR CIRCUIT DIAGRAM: FOR MOSFET MATLAB CIRCUIT FOR MOSFET Muthayammal Engineering college, Rasipuram. 28
  • 29. EE1303-Power Electronics Lab Manual TRANSIENT CHARACTERISTICS OF MOSFET AND SCR AIM: (i) Obtain and explain both turning ‘ON’ and turn ‘OFF’ characteristics of given SCR (ii) Obtain and explain both turning ‘ON’ and turn ‘OFF’ characteristics of given MOSFET. APPARATUS REQUIRED: S.No. Blocks Type Items Quantity 1 Simulink i. Sink Scope 1 ii. Source Pulse Generator 1 2 Sim power system MC Ammeter 1 i. Measurements MC Voltmeter 1 ii. Elements - RLC series branch 1 - MOSFET 1 iii. Power electronics - SCR 1 iV. Electrical source - DC source 1 PROCEDURE: FOR MOSFET 1. Open MATLAB and open Simulink then create a new file (new module) 2. Connections are made as per the circuit diagram by taking the required items from the corresponding blocks. 3. According to the MOSFET, we should give the block parameter for MOSFET, RLC series branch, pulse generator and the scope. 4. Now simulate the circuit. The graph of Gate pulse, Drain current and drain to source voltage can be shown. 5. Finally the print out of the MATLAB circuit and the output is taken. Muthayammal Engineering college, Rasipuram. 29
  • 30. EE1303-Power Electronics Lab Manual FOR SCR MATLAB CIRCUIT FOR SCR Muthayammal Engineering college, Rasipuram. 30
  • 31. EE1303-Power Electronics Lab Manual FOR SCR 1. Open MATLAB and open Simulink then create a new file (new module) 2. Connections are made as per the circuit diagram by taking the required items from the corresponding blocks. 3. According to the SCR, we should give the block parameter for SCR, RLC series branch, pulse generator and the scope. 4. Now simulate the circuit. The graph of Gate pulse, Anode current and anode to cathode voltage can be shown. 5. Finally the print out of the MATLAB circuit and the output is taken. Muthayammal Engineering college, Rasipuram. 31
  • 32. EE1303-Power Electronics Lab Manual MODEL GRAPH: FOR MOSFET FOR SCR Muthayammal Engineering college, Rasipuram. 32
  • 33. EE1303-Power Electronics Lab Manual INFERENCE: DISCUSSION QUESTIONS: 1. What is MATLAB? 2. What is a transient characteristic? 3. What is commutation? 4. Where the natural commutation is not possible in SCR? 5. What is the function of scope in MATLAB? RESULT: Muthayammal Engineering college, Rasipuram. 33
  • 34. EE1303-Power Electronics Lab Manual SINGLE PHASE AC TO DC FULLY CONTROLLED CONVERTER CIRCUIT DIAGRAM FOR R LOAD Model graph for R Load ° ( = 30°, R=100 ) Muthayammal Engineering college, Rasipuram. 34
  • 35. EE1303-Power Electronics Lab Manual SINGLE PHASE AC TO DC FULLY CONTROLLED CONVERTER AIM: (i) To study the operation of single phase fully controlled bridge converter with R and R-L loads for continuous and discontinuous conduction modes. (ii) Also find the performance parameters (Rectification efficiency, form factor, peak inverse voltage and ripple factor) APPARATUS REQUIRED: S.No. Name of the item Type Range Quantity 1 1 SCR bridge module TYN612 600V,12A 1 2 SCR Triggering Kit - - 1 3 Ammeter MC (0-500) mA 1 4 Voltmeter MC (0-30) V 1 5 CRO - - 1 6 CRO Brobe - - 1 7 Patch Cards - - 10 FORMULA USED: For R load Vm 1. Average dc output voltage Vdc is Vdc = (1 + cos ) 1 1 sin 2 2 2. RMS output voltage is Vrms Vrms = Vm + 2 2 For R-L load continuous conduction: 2Vm 1. Average dc output voltage Vdc is Vdc = cos Vm 2. RMS output voltage Vrms is Vrms = = Vs 2 For RL load discontinuous conduction: Vm 3. Average dc output voltage Vdc is Vdc = (cos cos ) 1 V2 sin 2 sin 2 2 4. RMS output voltage Vrms is Vrms = m + 2 2 2 Muthayammal Engineering college, Rasipuram. 35
  • 36. EE1303-Power Electronics Lab Manual CIRCUIT DIAGRAM FOR R-L LOAD Model graph for R-L Load with continuous conduction ° ( = 30°, R=100 , L=200mH) Model graph for R-L Load with discontinuous conduction ° ( = 90°, R=100 , L=200mH) Muthayammal Engineering college, Rasipuram. 36
  • 37. EE1303-Power Electronics Lab Manual General Formula: 2 Vdc 5. Rectification efficiency % = 2 Vrms V 6. Form factor FF = rms Vdc 7. Peak inverse voltage PIV = Vm 8. Ripple factor RF = FF 2 1 Where Vm = maximum or peak voltage in volts = 2Vs Vs = Supply voltage in volts = Firing angle = Extinction angle = Conduction angle = - Procedure: 1. Connections are made as per the circuit diagram for R load 2. Switch on the triggering kit 3. Switch on the 230 V AC supply 4. Switch on the debounce logic 5. By varying potentiometer vary the firing angle of the converter in order to vary the output voltage step by step. 6. For each step note down the firing angle, output voltage and load current. 7. The output voltage is theoretically calculated for each step and the readings are tabulated. 8. Repeat the same procedure for RL load. Muthayammal Engineering college, Rasipuram. 37
  • 38. EE1303-Power Electronics Lab Manual Tabulation for R load: Vs= R= S.No. Firing Angle Idc Measured Vdc Measured Vdc Calculated Vrms Calculated in degree in milliamps in volts in volts in volts Tabulation for RL load: Vs= R= L= = S.No. Firing Angle Idc Measured Vdc Measured Vdc Calculated Vrms Calculated in degree in milliamps in volts in volts in volts Continuous conduction Discontinuous conduction Muthayammal Engineering college, Rasipuram. 38
  • 39. EE1303-Power Electronics Lab Manual INFERENCE: DISCUSSION QUESTIONS: 1. What is inversion mode of operation? 2. When we connect a freewheeling diode in full converter, what will be the output? 3. Why the inversion mode is not possible in semi converter? 4. Why the power factor of full converter is lower than semi converter? 5. What is , , and µ? RESULT: Muthayammal Engineering college, Rasipuram. 39
  • 40. EE1303-Power Electronics Lab Manual SINGLE PHASE AC TO DC HALF CONTROLLED CONVERTER CIRCUIT DIAGRAM FOR R LOAD Model graph for R Load ° ( = 30°, R=100 ) Muthayammal Engineering college, Rasipuram. 40
  • 41. EE1303-Power Electronics Lab Manual SINGLE PHASE AC TO DC HALF CONTROLLED CONVERTER AIM: (i) To study the operation of single phase semi converter with R and R-L loads for continuous and discontinuous conduction modes. (ii) Also find the performance parameters (Rectification efficiency, form factor, peak inverse voltage and ripple factor) APPARATUS REQUIRED: S.No. Name of the item Type Range Quantity 1 SCR module with protection TYN612 600V,12A 2 2 Diode module with protection BY126 - 3 3 SCR Triggering Kit - - 1 4 Battery - 12V 1 5 Ammeter MC (0-500) mA 1 6 Voltmeter MC (0-30) V 1 7 CRO - - 1 8 CRO Brobe - - 1 9 Patch Cards - - 10 FORMULA USED: For R and RL load continuous & discontinuous conduction: V 1. Average dc output voltage Vdc is Vdc = m (1 + cos ) 1 1 sin 2 2 2. RMS output voltage is Vrms Vrms = Vm + 2 2 General Formula: 2 Vdc 3. Rectification efficiency % = 2 Vrms V 4. Form factor FF = rms Vdc 5. Peak inverse voltage PIV = Vm 6. Ripple factor RF = FF 2 1 Where Vm = maximum or peak voltage in volts = 2Vs Vs = Supply voltage in volts = Firing angle = Extinction angle = Conduction angle = - Muthayammal Engineering college, Rasipuram. 41
  • 42. EE1303-Power Electronics Lab Manual CIRCUIT DIAGRAM FOR R-L LOAD Model graph for R-L Load with continuous conduction ° ( = 30°, R=100 , L=100mH) Model graph for R-L Load with discontinuous conduction ° ( = 90°, R=100 , L=100mH) Muthayammal Engineering college, Rasipuram. 42
  • 43. EE1303-Power Electronics Lab Manual Procedure: 1. Connections are made as per the circuit diagram for RL load 2. Switch on the triggering kit 3. Switch on the 230V AC supply 4. Switch on the debounce logic 5. By varying potentiometer vary the firing angle of the converter in order to vary the output voltage step by step. 6. For each step note down the firing angle, output voltage and load current. 7. The output voltage is theoretically calculated for each step and the readings are tabulated. 8. Repeat the same procedure for RL load. Muthayammal Engineering college, Rasipuram. 43
  • 44. EE1303-Power Electronics Lab Manual Tabulation for R load: Vs= R= S.No. Firing Angle Idc Measured Vdc Measured Vdc Calculated Vrms Calculated in degree in milliamps in volts in volts in volts Tabulation for RL load: S.No. Firing Angle Idc Measured Vdc Measured Vdc Calculated Vrms Calculated in degree in milliamps in volts in volts in volts Continuous conduction Discontinuous conduction Muthayammal Engineering college, Rasipuram. 44
  • 45. EE1303-Power Electronics Lab Manual INFERENCE: DISCUSSION QUESTIONS: 1. What is power electronics? 2. What are the types of converter in power electronics? 3. What is firing angle? 4. What is active load? 5. Why the negative voltage is not possible in semi converter? 6. What is freewheeling diode? 7. Is a separate freewheeling diode necessary for semi converter? Justify your answer. RESULT: Muthayammal Engineering college, Rasipuram. 45
  • 46. EE1303-Power Electronics Lab Manual STEP DOWN MOSFET BASED CHOPPER CIRCUIT DIAGRAM MODEL GRAPH Muthayammal Engineering college, Rasipuram. 46
  • 47. EE1303-Power Electronics Lab Manual STEP DOWN MOSFET BASED CHOPPER AIM: To study the waveform for MOSFET based step down chopper for different load for continuous and discontinuous conduction modes. APPARATUS REQUIRED: S.No. Name of the item Type Range Quantity 1 MOSFET Module IRF 840 - 1 2 Ammeter MC (0-500mA) 1 3 Voltmeter MC (0-30V) 1 4 Rheostat - - 1 5 RPS - (0-30V) 1 6 CRO - - 1 7 CRO Probe - - 1 8 Patch cards - - - FORMULA USED: 1. Average dc output voltage Vdc is Vdc = Vs 2. RMS output voltage Vrms is Vrms = Vs Where: TON = Duty cycle of the chopper = T TON = on time T = Total time Procedure: 1. Connections are made as per the circuit diagram. 2. Switch on the RPS and turn on triggering kit 3. Switch on the debounce logic 4. By changing the width of the pulse, obtain the different set of reading. 5. For each step note down the duty cycle, output voltage and load current and tabulate it. 6. The output voltage is theoretically calculated. 7. Draw the graph as per the reading in the table. Muthayammal Engineering college, Rasipuram. 47
  • 48. EE1303-Power Electronics Lab Manual TABULATION: Vs= T= S.No. TON TON Idc (Avg) Vdc (Avg) Vdc (Avg) in ms = Measured Measured Calculated T in mA in volts in volts Vdc = Vs 1 2 3 4 5 Muthayammal Engineering college, Rasipuram. 48
  • 49. EE1303-Power Electronics Lab Manual INFERENCE: DISCUSSION QUESTIONS: 1. What is chopper and what are the devices generally used for chopper? 2. What are the types of chopper? 3. What is step down chopper? 4. What are the control strategies used for choppers? 5. Why frequency modulation is not preferred mostly? 6. Why thyristor is not preferred in chopper circuit mostly? RESULT: Muthayammal Engineering college, Rasipuram. 49
  • 50. EE1303-Power Electronics Lab Manual STEP UP MOSFET BASED CHOPPER CIRCUIT DIAGRAM: Model graph for step up operation Muthayammal Engineering college, Rasipuram. 50
  • 51. EE1303-Power Electronics Lab Manual STEP UP MOSFET BASED CHOPPER AIM: To study the waveform for MOSFET based step up chopper for different load for continuous and discontinuous conduction modes. APPARATUS REQUIRED: S.No. Name of the item Type Range Quantity 1 MOSFET Module IRF 840 - 1 2 Ammeter MC (0-500mA) 1 3 Voltmeter MC (0-30V) 1 4 Rheostat - - 1 5 RPS - (0-30V) 1 6 Diode Py 127 - 1 7 Inductor Ferrite core 100mH 1 8 CRO - - 1 9 CRO Probe - - 1 10 Patch cards - - - FORMULA USED: Vs Average dc output voltage Vdc is Vdc = (1 ) Where: TON = Duty cycle of the chopper = T TON = on time T = Total time PROCEDURE: 1. Connections are made as per the circuit diagram 2. Switch on the RPS and turn on triggering kit 3. Switch on the debounce logic 4. By changing the width of the pulse, obtain the different set of reading. 5. For each step note down the duty cycle, output voltage and load current and tabulate it. 6. The output voltage is theoretically calculated for each step. 7. Draw the graph as per the reading in the table. Muthayammal Engineering college, Rasipuram. 51
  • 52. EE1303-Power Electronics Lab Manual TABULATION: Vs= T= S.No. TON TON Idc (Avg) Vdc (Avg) Vdc (Avg) in ms = Measured Measured Calculated T in mA in volts in volts Vs Vdc = (1 ) 1 2 3 4 5 Muthayammal Engineering college, Rasipuram. 52
  • 53. EE1303-Power Electronics Lab Manual INFERENCE: DISCUSSION QUESTIONS: 1. What is chopper and what are the devices generally used for chopper? 2. What are the types of chopper? 3. What is step up chopper? 4. What are the control strategies used for choppers? 5. Why frequency modulation is not preferred mostly? 6. Why thyristor is not preferred in chopper circuit mostly? RESULT: Muthayammal Engineering college, Rasipuram. 53
  • 54. EE1303-Power Electronics Lab Manual IGBT BASED SINGLE PHASE PWM INVERTER CIRCUIT DIAGRAM Muthayammal Engineering college, Rasipuram. 54
  • 55. EE1303-Power Electronics Lab Manual IGBT BASED SINGLE PHASE PWM INVERTER AIM: To study the operation of single-phase bridge inverter with sinusoidal pulse width modulation with R load. APPARATUS REQUIRED: S.No. Name of the item Type Range Quantity 1 IGBT Module - - 1 2 Inverter control module - - 1 3 CRO - - 1 4 Ammeter MI (0-5A) 1 5 Voltmeter MI (0-300V) 1 6 Patch cards - - - FORMULA USED: 1. Modulation index (m) is m = Ar / Ac 2. Output voltage V0 = m Vs Where Ar = Amplitude of reference signal Ac = Amplitude of carrier signal Vs = Source voltage Muthayammal Engineering college, Rasipuram. 55
  • 56. EE1303-Power Electronics Lab Manual Model graph Sinusoidal Pulse width modulation Voltage and current waveforms Muthayammal Engineering college, Rasipuram. 56
  • 57. EE1303-Power Electronics Lab Manual Precaution: 1. Check whether AC main switch is off condition in both the trainer. 2. Check whether control module mode selector switch is in first position (Sine wave). 3. Check whether control module pulse release switch SW4 in control module is off position. 4. Check whether 24V AC switch is in off position. Procedure: 1. Make the connection as per the circuit diagram. 2. Switch on the AC main in both the trainer. 3. Measure the amplitude and frequency of sine wave and carrier triangular wave and tabulate it. Also adjust sine wave frequency to 50Hz. 4. Connect CRO probe to observe the load voltage and load current waveform. 5. Release the switch SW4 in the inverter control module and switch SW1 in the IGBT power module. 6. Measure the output voltage. 7. Using the amplitude POT to vary step by step, for each step note down the amplitude and frequency of sine wave and triangular waveform and also measure the output voltage and tabulate it. 8. Then find the theoretical output voltage by using the formula. Muthayammal Engineering college, Rasipuram. 57
  • 58. EE1303-Power Electronics Lab Manual Tabulation: Vs= S.No. Amplitude Amplitude Modulation I0 V0 V0 of carrier of index Measured Measured Calculated triangular reference m= Ar/Ac in Amps in Volts in Volts wave sine wave V0 = m X V s (Ac) in (Ar) in volts volts 1 2 3 4 5 6 Muthayammal Engineering college, Rasipuram. 58
  • 59. EE1303-Power Electronics Lab Manual INFERENCE: DISCUSSION QUESTIONS: 1. What is inverter? 2. Why we go for PWM? 3. What are the different types of PWM? 4. What is modulation index and what are the types? 5. What are the advantages of IGBT? RESULT: Muthayammal Engineering college, Rasipuram. 59
  • 60. EE1303-Power Electronics Lab Manual SERIES RESONANT DC-DC CONVERTER (ZERO CURRENT SWITCHING) CIRCUIT DIAGRAM: MODEL GRAPH: Muthayammal Engineering college, Rasipuram. 60
  • 61. EE1303-Power Electronics Lab Manual SERIES RESONANT DC-DC CONVERTER (ZERO CURRENT SWITCHING) AIM: To determine the voltage and current wave form of series resonant dc-dc converter (Zero current switching). APPARATUS REQUIRED: S.No. Name of the item Type Range Quantity 1 Resonant converter module VPET-315 - 1 2 Ammeter MC (0-2) A 1 3 Voltmeter MC (0-30) V 1 4 CRO - - 1 5 CRO Brobe - - 1 6 Patch Cards - - 10 FORMULA USED: 1 Frequency f = Hz T Where: T= Time f = Frequency PRECAUTIONS: Initially keep the frequency adjustment POT in minimum position PROCEDURE: 1. Connections are made as per the circuit diagram. 2. Initially keep frequency adjustment POT in minimum position. 3. Switch on the main supply 4. Connect the “P” Pin connector from PWM output and PWM input 5. Connect the banana connector P10 to P4 , P8 to P11 6. Connect the current sensing resistor (1 / 20 W) across the banana connector P2 to P3. 7. The voltmeter is connected across P5 and P12 Muthayammal Engineering college, Rasipuram. 61
  • 62. EE1303-Power Electronics Lab Manual TABULATION: Switching Output Output S.No. Time (ms) Frequency Voltage (V) Current (A) (KHz) 1 2 3 4 5 Muthayammal Engineering college, Rasipuram. 62
  • 63. EE1303-Power Electronics Lab Manual 8. Connected the R load across P5 and P12 through ammeter. 9. Adjust the frequency POT and set switching frequency 40KHz. 10. Connect the CRO across the connector T1 (+) and ground. Another channel is connected to P2 (+), P3 (-) 11. Now observe the switch voltage and current wave. 12. Similarly observe the switch voltage and current waveform for various switching frequency. INFERENCE: DISCUSSION QUESTIONS: 1. What is resonance? 2. What is the condition for resonance? 3. What are the advantages of resonant converter? 4. What is soft switching? 5. What types of resonant converter? 6. What is zero current switching? 7. What is zero voltage switching? RESULT: Muthayammal Engineering college, Rasipuram. 63
  • 64. EE1303-Power Electronics Lab Manual PARALLEL RESONANT DC-DC CONVERTER (ZERO VOLTAGE SWITCHING) CIRCUIT DIAGRAM: MODEL GRAPH: Muthayammal Engineering college, Rasipuram. 64
  • 65. EE1303-Power Electronics Lab Manual PARALLEL RESONANT DC-DC CONVERTER (ZERO VOLTAGE SWITCHING) AIM: To determine the voltage and current wave form of parallel resonant dc-dc converter (Zero voltage switching). APPARATUS REQUIRED: S.No. Name of the item Type Range Quantity 1 Resonant converter module VPET-315 - 1 2 Ammeter MC (0-2) A 1 3 Voltmeter MC (0-30) V 1 4 CRO - - 1 5 CRO Brobe - - 1 6 Patch Cards - - 10 FORMULA USED: 1 Frequency f = Hz T Where: T= Time f = Frequency PRECAUTIONS: Initially keep the frequency adjustment POT in minimum position PROCEDURE: 1. Connections are made as per the circuit diagram. 2. Initially keep frequency adjustment POT in minimum position. 3. Switch on the main supply 4. Connect the “9” Pin connector from PWM output and PWM input 5. Connect the banana connector P10 to P4, P8 to P11 6. Connect the current sensing resistor (1 / 20 W) across the banana connector P2 to P3. 7. The voltmeter is connected across P5 and P12 Muthayammal Engineering college, Rasipuram. 65
  • 66. EE1303-Power Electronics Lab Manual TABULATION: Switching Output Output S.No. Time (ms) Frequency Voltage (V) Current (A) (KHz) 1 2 3 4 5 Muthayammal Engineering college, Rasipuram. 66
  • 67. EE1303-Power Electronics Lab Manual 8. Connected the R load across P5 and P12 through ammeter. 9. Adjust the frequency POT and set switching frequency 40KHz. 10. Connect the CRO across the connector T1 (+) and ground. Another channel is connected to P2 (+), P3 (-) 11. Now observe the switch voltage and current wave. 12. Similarly observe the switch voltage and current waveform for various switching frequency. INFERENCE: DISCUSSION QUESTIONS: 1. What is resonance? 2. What is the condition for resonance? 3. What are the advantages of resonant converter? 4. What is soft switching? 5. What types of resonant converter? 6. What is zero current switching? 7. What is zero voltage switching? RESULT: Muthayammal Engineering college, Rasipuram. 67