EE1303-Power Electronics Lab ManualMUTHAYAMMAL ENGINEERING COLLEGE, RASIPURAM Department of Electrical and Electronics Eng...
EE1303-Power Electronics Lab ManualMuthayammal Engineering college, Rasipuram.                 2
EE1303-Power Electronics Lab Manual                    INSTRUCTIONS TO THE CANDIDATESAFETY:      You are doing experiments...
EE1303-Power Electronics Lab Manual        Shows the performance of equipment and yourself. It will be very usefulfor futu...
EE1303-Power Electronics Lab Manual                           CONTENTSSl.No.                   Name of the experiment     ...
EE1303-Power Electronics Lab Manual                         VI CHARACTERISTICS OF SCRCIRCUIT DIAGRAM:VI Characteristics1 H...
EE1303-Power Electronics Lab Manual                            VI CHARACTERISTICS OF SCRAIM:      (i) To Conduct an experi...
EE1303-Power Electronics Lab ManualMODEL GRAPH:VI CHARACTERISTICS OF SCR1 HALF WAVE RECTIFIER            Muthayammal Engin...
EE1303-Power Electronics Lab ManualPRECAUTION:   1. The initial set gate current should be taken as minimum in order to ta...
EE1303-Power Electronics Lab ManualTABULATION:VI Characteristics:                      IG1 =                      IG2 =   ...
EE1303-Power Electronics Lab Manual1 HALF WAVE RECTIFIER:   1. Connections are made as per the circuit diagram.   2. Switc...
EE1303-Power Electronics Lab Manual                        VI CHARACTERISTICS OF TRIACCIRCUIT DIAGRAM:VI CharacteristicsSi...
EE1303-Power Electronics Lab Manual                            VI CHARACTERISTICS OF TRIACAIM:     (i) To obtain the forwa...
EE1303-Power Electronics Lab ManualMODEL GRAPH:VI CHARACTERISTICS OF TRIACSingle-phase A.C phase controller for illuminati...
EE1303-Power Electronics Lab ManualPROCEDURE:VI Characteristics:   1. Connections are made as per the circuit diagram with...
EE1303-Power Electronics Lab ManualTABULATION:VI Characteristics:MT1 is + Ve with respect to MT2                        IG...
EE1303-Power Electronics Lab ManualINFERENCE:DISCUSSION QUESTIONS:1. What is bidirectional device?2. What is bipolar devic...
EE1303-Power Electronics Lab Manual                     VI CHARACTERISTICS OF MOSFETCIRCUIT DIAGRAM:VI CHARACTERISTICS    ...
EE1303-Power Electronics Lab Manual                        VI CHARACTERISTICS OF MOSFETAIM:      (i) Obtain the steady – s...
EE1303-Power Electronics Lab ManualMODEL GRAPH:DRAIN CHARACTERISTICSTRANSFER CHARACTERISTICS            Muthayammal Engine...
EE1303-Power Electronics Lab Manual  3. Keep the gate - source voltage (VGS) to a suitable value (say minimum of 6V to    ...
EE1303-Power Electronics Lab ManualTABULATION:Drain Characteristics:                 VGS1 =                 VGS2 =        ...
EE1303-Power Electronics Lab ManualINFERENCE:DISCUSSION QUESTIONS:1. What is current control device?2. What is voltage con...
EE1303-Power Electronics Lab Manual                     VI CHARACTERISTICS OF IGBTCIRCUIT DIAGRAM:VI CHARACTERISTICSMODEL ...
EE1303-Power Electronics Lab Manual                           VI CHARACTERISTICS OF IGBTAIM:      (i) Obtain the steady – ...
EE1303-Power Electronics Lab ManualTABULATION:              VGE1 =                  VGE2 =                     VGE3 = S.No...
EE1303-Power Electronics Lab Manual   4. Now slowly increase the drain-source voltage (VDS) by varying the pot till      M...
EE1303-Power Electronics Lab Manual          TRANSIENT CHARACTERISTICS OF MOSFET AND SCRCIRCUIT DIAGRAM:FOR MOSFETMATLAB C...
EE1303-Power Electronics Lab Manual              TRANSIENT CHARACTERISTICS OF MOSFET AND SCRAIM:      (i) Obtain and expla...
EE1303-Power Electronics Lab ManualFOR SCRMATLAB CIRCUIT FOR SCR            Muthayammal Engineering college, Rasipuram.   ...
EE1303-Power Electronics Lab ManualFOR SCR  1. Open MATLAB and open Simulink then create a new file (new module)  2. Conne...
EE1303-Power Electronics Lab ManualMODEL GRAPH:FOR MOSFETFOR SCR             Muthayammal Engineering college, Rasipuram.  ...
EE1303-Power Electronics Lab ManualINFERENCE:DISCUSSION QUESTIONS:1. What is MATLAB?2. What is a transient characteristic?...
EE1303-Power Electronics Lab ManualSINGLE PHASE AC TO DC FULLY CONTROLLED CONVERTER             CIRCUIT DIAGRAM FOR R LOAD...
EE1303-Power Electronics Lab Manual          SINGLE PHASE AC TO DC FULLY CONTROLLED CONVERTERAIM:       (i) To study the o...
EE1303-Power Electronics Lab Manual          CIRCUIT DIAGRAM FOR R-L LOAD Model graph for R-L Load with continuous conduct...
EE1303-Power Electronics Lab Manual  General Formula:                                                          2          ...
EE1303-Power Electronics Lab ManualTabulation for R load:                                               Vs=               ...
EE1303-Power Electronics Lab ManualINFERENCE:DISCUSSION QUESTIONS:  1.   What is inversion mode of operation?  2.   When w...
EE1303-Power Electronics Lab ManualSINGLE PHASE AC TO DC HALF CONTROLLED CONVERTER             CIRCUIT DIAGRAM FOR R LOAD ...
EE1303-Power Electronics Lab Manual           SINGLE PHASE AC TO DC HALF CONTROLLED CONVERTERAIM:       (i) To study the o...
EE1303-Power Electronics Lab Manual          CIRCUIT DIAGRAM FOR R-L LOAD Model graph for R-L Load with continuous conduct...
EE1303-Power Electronics Lab ManualProcedure:  1. Connections are made as per the circuit diagram for RL load  2. Switch o...
EE1303-Power Electronics Lab ManualTabulation for R load:                                               Vs=               ...
EE1303-Power Electronics Lab ManualINFERENCE:DISCUSSION QUESTIONS:1. What is power electronics?2. What are the types of co...
EE1303-Power Electronics Lab Manual                  STEP DOWN MOSFET BASED CHOPPERCIRCUIT DIAGRAMMODEL GRAPH             ...
EE1303-Power Electronics Lab Manual                           STEP DOWN MOSFET BASED CHOPPERAIM:       To study the wavefo...
EE1303-Power Electronics Lab ManualTABULATION:                                    Vs=               T=S.No.    TON        ...
EE1303-Power Electronics Lab ManualINFERENCE:DISCUSSION QUESTIONS:  1.   What is chopper and what are the devices generall...
EE1303-Power Electronics Lab Manual                   STEP UP MOSFET BASED CHOPPERCIRCUIT DIAGRAM:                    Mode...
EE1303-Power Electronics Lab Manual                             STEP UP MOSFET BASED CHOPPERAIM:       To study the wavefo...
EE1303-Power Electronics Lab ManualTABULATION:                                             Vs=                       T=S.N...
EE1303-Power Electronics Lab ManualINFERENCE:DISCUSSION QUESTIONS:  1.   What is chopper and what are the devices generall...
EE1303-Power Electronics Lab Manual IGBT BASED SINGLE PHASE PWM INVERTER                CIRCUIT DIAGRAMMuthayammal Enginee...
EE1303-Power Electronics Lab Manual                    IGBT BASED SINGLE PHASE PWM INVERTERAIM:      To study the operatio...
EE1303-Power Electronics Lab Manual                   Model graph       Sinusoidal Pulse width modulation         Voltage ...
EE1303-Power Electronics Lab ManualPrecaution:  1. Check whether AC main switch is off condition in both the trainer.  2. ...
EE1303-Power Electronics Lab ManualTabulation:                                                  Vs=S.No. Amplitude Amplitu...
EE1303-Power Electronics Lab ManualINFERENCE:DISCUSSION QUESTIONS:  1.   What is inverter?  2.   Why we go for PWM?  3.   ...
EE1303-Power Electronics Lab Manual                   SERIES RESONANT DC-DC CONVERTER                       (ZERO CURRENT ...
EE1303-Power Electronics Lab Manual                      SERIES RESONANT DC-DC CONVERTER                          (ZERO CU...
EE1303-Power Electronics Lab ManualTABULATION:                        Switching                                          O...
EE1303-Power Electronics Lab Manual   8. Connected the R load across P5 and P12 through ammeter.   9. Adjust the frequency...
EE1303-Power Electronics Lab Manual               PARALLEL RESONANT DC-DC CONVERTER                    (ZERO VOLTAGE SWITC...
EE1303-Power Electronics Lab Manual                    PARALLEL RESONANT DC-DC CONVERTER                         (ZERO VOL...
EE1303-Power Electronics Lab ManualTABULATION:                        Switching                                          O...
EE1303-Power Electronics Lab Manual   8. Connected the R load across P5 and P12 through ammeter.   9. Adjust the frequency...
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Power Electronics lab manual BE EEE

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The manual is very useful for UG EEE students for the subject Power Electronics
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M.MURUGANANDAM. M.E.,(Ph.D).,MIEEE.,MISTE,
Assistant Professor & Head / EIE,
Muthayammal Engineering College,
Rasipuram,
Namakkal-637 408.
Cell No: 9965768327

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  1. 1. EE1303-Power Electronics Lab ManualMUTHAYAMMAL ENGINEERING COLLEGE, RASIPURAM Department of Electrical and Electronics Engineering V Semester – BE (EEE) EE 1303 - Power Electronics Laboratory ManualPrepared by Approved byProf.M.Muruganandam, M.E.,(Ph.D), Dr P.Murugesan,B.E.,Ph.D.,AP/ EEE Proff. & HOD/EEERevision No.:1 Date:24.06.2008 Muthayammal Engineering college, Rasipuram. 1
  2. 2. EE1303-Power Electronics Lab ManualMuthayammal Engineering college, Rasipuram. 2
  3. 3. EE1303-Power Electronics Lab Manual INSTRUCTIONS TO THE CANDIDATESAFETY: You are doing experiments in Power Electronics lab with high voltage andhigh current electric power. It may cause even a fatal or loss of energy of yourbody 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 failto make your presence with your record notebook having completedexperiments, observation with completed experiments, day’s experimentparticulars 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. 4. EE1303-Power Electronics Lab Manual Shows the performance of equipment and yourself. It will be very usefulfor 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. 5. EE1303-Power Electronics Lab Manual CONTENTSSl.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. 6. EE1303-Power Electronics Lab Manual VI CHARACTERISTICS OF SCRCIRCUIT DIAGRAM:VI Characteristics1 Half wave RectifierTriggering Circuit for 1 Half wave Rectifier Muthayammal Engineering college, Rasipuram. 6
  7. 7. EE1303-Power Electronics Lab Manual VI CHARACTERISTICS OF SCRAIM: (i) To Conduct an experiment and obtain the anode forward conductioncharacteristics of the given SCR also find the latching and holding currents of the givenSCR. (ii) To Demonstrate how a single-phase half wave rectifier circuit can beimplemented 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 - - 10FORMULA 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 2Where 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. 8. EE1303-Power Electronics Lab ManualMODEL GRAPH:VI CHARACTERISTICS OF SCR1 HALF WAVE RECTIFIER Muthayammal Engineering college, Rasipuram. 8
  9. 9. EE1303-Power Electronics Lab ManualPRECAUTION: 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. 10. EE1303-Power Electronics Lab ManualTABULATION:VI Characteristics: IG1 = IG2 = IG3 = S.No. VAK(V) IA(mA) VAK(V) IA(mA) VAK(V) IA(mA) 1 2 3 4 5 61 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. 11. EE1303-Power Electronics Lab Manual1 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. 12. EE1303-Power Electronics Lab Manual VI CHARACTERISTICS OF TRIACCIRCUIT DIAGRAM:VI CharacteristicsSingle-phase A.C phase controller for illumination control Muthayammal Engineering college, Rasipuram. 12
  13. 13. EE1303-Power Electronics Lab Manual VI CHARACTERISTICS OF TRIACAIM: (i) To obtain the forward and reverse conduction characteristics of the givenTRIAC also find the latching and holding currents of the given TRIAC. (ii) To demonstrate how a single- phase AC phase controller can be implementedfor controlling the illumination of lamp, using given TRIAC and RC triggering circuit anddraw 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 - - 10FORMULA USED: 1 1 Sin2 2 The RMS output voltage is V0 RMS = Vs + 2Where = Firing angle Vs = Source voltagePRECAUTION: 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. 14. EE1303-Power Electronics Lab ManualMODEL GRAPH:VI CHARACTERISTICS OF TRIACSingle-phase A.C phase controller for illumination control Muthayammal Engineering college, Rasipuram. 14
  15. 15. EE1303-Power Electronics Lab ManualPROCEDURE: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. 16. EE1303-Power Electronics Lab ManualTABULATION: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 5MT2 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 5Single-phase A.C phase controllerS.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. 17. EE1303-Power Electronics Lab ManualINFERENCE: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. 18. EE1303-Power Electronics Lab Manual VI CHARACTERISTICS OF MOSFETCIRCUIT DIAGRAM:VI CHARACTERISTICS Muthayammal Engineering college, Rasipuram. 18
  19. 19. EE1303-Power Electronics Lab Manual VI CHARACTERISTICS OF MOSFETAIM: (i) Obtain the steady – state output – side characteristics and transfercharacteristics of the given MOSFET, for a specified value of gate – sourcevoltage. (ii) Identify whether given switch is MOSFET or IGBT by finding theoutput– 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 - - 10FORMULA USED: ID1. Trans conductance Gm = mho VDS V DS2. Output resistance RDS = ohm IDWhere: ID = Change in drain current. VDS = Change in drain to source voltagePRECAUTION: 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. 20. EE1303-Power Electronics Lab ManualMODEL GRAPH:DRAIN CHARACTERISTICSTRANSFER CHARACTERISTICS Muthayammal Engineering college, Rasipuram. 20
  21. 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. 22. EE1303-Power Electronics Lab ManualTABULATION:Drain Characteristics: VGS1 = VGS2 = VGS3 = S.No. VDS(V) ID(mA) VDS(V) ID(mA) VDS(V) ID(mA) 1 2 3 4 5Transfer Characteristics: VDS = VGS(V) S.No. ID(mA) 1 2 3 4 5 Muthayammal Engineering college, Rasipuram. 22
  23. 23. EE1303-Power Electronics Lab ManualINFERENCE: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. 24. EE1303-Power Electronics Lab Manual VI CHARACTERISTICS OF IGBTCIRCUIT DIAGRAM:VI CHARACTERISTICSMODEL GRAPH: Muthayammal Engineering college, Rasipuram. 24
  25. 25. EE1303-Power Electronics Lab Manual VI CHARACTERISTICS OF IGBTAIM: (i) Obtain the steady – state output – side characteristics and transfercharacteristics of the given IGBT, for a specified value of gate – source voltage. (ii) Identify whether given switch is MOSFET or IGBT by finding theoutput– 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 - - 10FORMULA USED: IC1. Trans conductance Gm = mho VCE VCE2. Output resistance RCE = ohm ICWhere: IC = Change in collector current. VCE = Change in collector to emitter voltagePRECAUTION: 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. 26. EE1303-Power Electronics Lab ManualTABULATION: 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. 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. 28. EE1303-Power Electronics Lab Manual TRANSIENT CHARACTERISTICS OF MOSFET AND SCRCIRCUIT DIAGRAM:FOR MOSFETMATLAB CIRCUIT FOR MOSFET Muthayammal Engineering college, Rasipuram. 28
  29. 29. EE1303-Power Electronics Lab Manual TRANSIENT CHARACTERISTICS OF MOSFET AND SCRAIM: (i) Obtain and explain both turning ‘ON’ and turn ‘OFF’ characteristics ofgiven SCR (ii) Obtain and explain both turning ‘ON’ and turn ‘OFF’ characteristics ofgiven 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 1PROCEDURE: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. 30. EE1303-Power Electronics Lab ManualFOR SCRMATLAB CIRCUIT FOR SCR Muthayammal Engineering college, Rasipuram. 30
  31. 31. EE1303-Power Electronics Lab ManualFOR 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. 32. EE1303-Power Electronics Lab ManualMODEL GRAPH:FOR MOSFETFOR SCR Muthayammal Engineering college, Rasipuram. 32
  33. 33. EE1303-Power Electronics Lab ManualINFERENCE: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. 34. EE1303-Power Electronics Lab ManualSINGLE 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. 35. EE1303-Power Electronics Lab Manual SINGLE PHASE AC TO DC FULLY CONTROLLED CONVERTERAIM: (i) To study the operation of single phase fully controlled bridge converter with Rand 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 - - 10FORMULA 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. 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. 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 1Where 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. 38. EE1303-Power Electronics Lab ManualTabulation 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 voltsTabulation 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. 39. EE1303-Power Electronics Lab ManualINFERENCE: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. 40. EE1303-Power Electronics Lab ManualSINGLE 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. 41. EE1303-Power Electronics Lab Manual SINGLE PHASE AC TO DC HALF CONTROLLED CONVERTERAIM: (i) To study the operation of single phase semi converter with R and R-L loads forcontinuous 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 - - 10FORMULA 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 1Where 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. 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. 43. EE1303-Power Electronics Lab ManualProcedure: 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. 44. EE1303-Power Electronics Lab ManualTabulation 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 voltsTabulation 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. 45. EE1303-Power Electronics Lab ManualINFERENCE: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. 46. EE1303-Power Electronics Lab Manual STEP DOWN MOSFET BASED CHOPPERCIRCUIT DIAGRAMMODEL GRAPH Muthayammal Engineering college, Rasipuram. 46
  47. 47. EE1303-Power Electronics Lab Manual STEP DOWN MOSFET BASED CHOPPERAIM: To study the waveform for MOSFET based step down chopper for different loadfor 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 timeProcedure: 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. 48. EE1303-Power Electronics Lab ManualTABULATION: 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. 49. EE1303-Power Electronics Lab ManualINFERENCE: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. 50. EE1303-Power Electronics Lab Manual STEP UP MOSFET BASED CHOPPERCIRCUIT DIAGRAM: Model graph for step up operation Muthayammal Engineering college, Rasipuram. 50
  51. 51. EE1303-Power Electronics Lab Manual STEP UP MOSFET BASED CHOPPERAIM: To study the waveform for MOSFET based step up chopper for different load forcontinuous 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 timePROCEDURE: 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. 52. EE1303-Power Electronics Lab ManualTABULATION: 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. 53. EE1303-Power Electronics Lab ManualINFERENCE: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. 54. EE1303-Power Electronics Lab Manual IGBT BASED SINGLE PHASE PWM INVERTER CIRCUIT DIAGRAMMuthayammal Engineering college, Rasipuram. 54
  55. 55. EE1303-Power Electronics Lab Manual IGBT BASED SINGLE PHASE PWM INVERTERAIM: To study the operation of single-phase bridge inverter with sinusoidal pulse widthmodulation 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 VsWhere Ar = Amplitude of reference signal Ac = Amplitude of carrier signal Vs = Source voltage Muthayammal Engineering college, Rasipuram. 55
  56. 56. EE1303-Power Electronics Lab Manual Model graph Sinusoidal Pulse width modulation Voltage and current waveformsMuthayammal Engineering college, Rasipuram. 56
  57. 57. EE1303-Power Electronics Lab ManualPrecaution: 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. 58. EE1303-Power Electronics Lab ManualTabulation: 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. 59. EE1303-Power Electronics Lab ManualINFERENCE: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. 60. EE1303-Power Electronics Lab Manual SERIES RESONANT DC-DC CONVERTER (ZERO CURRENT SWITCHING)CIRCUIT DIAGRAM:MODEL GRAPH: Muthayammal Engineering college, Rasipuram. 60
  61. 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-dcconverter (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 - - 10FORMULA USED: 1Frequency f = Hz TWhere:T= Timef = FrequencyPRECAUTIONS: Initially keep the frequency adjustment POT in minimum positionPROCEDURE: 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. 62. EE1303-Power Electronics Lab ManualTABULATION: Switching Output Output S.No. Time (ms) Frequency Voltage (V) Current (A) (KHz) 1 2 3 4 5 Muthayammal Engineering college, Rasipuram. 62
  63. 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. 64. EE1303-Power Electronics Lab Manual PARALLEL RESONANT DC-DC CONVERTER (ZERO VOLTAGE SWITCHING)CIRCUIT DIAGRAM:MODEL GRAPH: Muthayammal Engineering college, Rasipuram. 64
  65. 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-dcconverter (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 - - 10FORMULA USED: 1Frequency f = Hz TWhere:T= Timef = FrequencyPRECAUTIONS: Initially keep the frequency adjustment POT in minimum positionPROCEDURE: 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. 66. EE1303-Power Electronics Lab ManualTABULATION: Switching Output Output S.No. Time (ms) Frequency Voltage (V) Current (A) (KHz) 1 2 3 4 5 Muthayammal Engineering college, Rasipuram. 66
  67. 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

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