This ppt provides a brief overview on thyristors commonly known as SCRs. V- I characteristics curve, triggering methods, protection methods, series and parallel operations of SCRs, applications are discussed in this slide.
As we have discussed that out of various triggering methods to turn the SCR, gate triggering is the most efficient and reliable method. Most of the control applications use this type of triggering because the desired instant of SCR turning is possible with gate triggering method.
This ppt provides a brief overview on thyristors commonly known as SCRs. V- I characteristics curve, triggering methods, protection methods, series and parallel operations of SCRs, applications are discussed in this slide.
As we have discussed that out of various triggering methods to turn the SCR, gate triggering is the most efficient and reliable method. Most of the control applications use this type of triggering because the desired instant of SCR turning is possible with gate triggering method.
To turn on a Thyristor, there are various triggering methods in which a trigger pulse is applied at its Gate terminal. Similarly, there are various techniques to turn off a Thyristor, these techniques are called Thyristor Commutation Techniques.
It’s a power electronics project. It is able to give output voltage(DC) more and less than input voltage as per requirement.
We can generate variable DC voltage which is less than input, but, the special things about this converter is, it has capability to produce variable DC voltage as high as twice the input voltage.
We have specially designed and manufactured inductor for this project.
Inverter is a device which convert a DC input supply voltage into symmetric AC voltage of desired magnitude and frequency at the output side. It is also know as DC-AC converter.
Ideal and practical inverter have sinusoidal and no-sinusoidal waveforms at output respectively.
If the input dc is a voltage source, the inverter is called a Voltage Source Inverter (VSI). One can similarly think of a Current Source Inverter (CSI), where the input to the circuit is a current source. The VSI circuit has direct control over ‘output (ac) voltage’ whereas the CSI directly controls ‘output (ac) current.
Inverter is a device which convert a DC input supply voltage into symmetric AC voltage of desired magnitude and frequency at the output side. It is also know as DC-AC converter.
Ideal and practical inverter have sinusoidal and no-sinusoidal waveforms at output respectively.
If the input dc is a voltage source, the inverter is called a Voltage Source Inverter (VSI). One can similarly think of a Current Source Inverter (CSI), where the input to the circuit is a current source. The VSI circuit has direct control over ‘output (ac) voltage’ whereas the CSI directly controls ‘output (ac) current.
single phase half bridge inverter, full bridge inverter, parallel inverter, load commutated inverter with working and waveforms.
download and watch the animations. it will be effective.
single phase bridge inverter harmonic analysis.
Nowadays, it is very important to maintain voltage level. Controlling of that voltage is also important. This Presentation contains methods of voltage control.
To turn on a Thyristor, there are various triggering methods in which a trigger pulse is applied at its Gate terminal. Similarly, there are various techniques to turn off a Thyristor, these techniques are called Thyristor Commutation Techniques.
It’s a power electronics project. It is able to give output voltage(DC) more and less than input voltage as per requirement.
We can generate variable DC voltage which is less than input, but, the special things about this converter is, it has capability to produce variable DC voltage as high as twice the input voltage.
We have specially designed and manufactured inductor for this project.
Inverter is a device which convert a DC input supply voltage into symmetric AC voltage of desired magnitude and frequency at the output side. It is also know as DC-AC converter.
Ideal and practical inverter have sinusoidal and no-sinusoidal waveforms at output respectively.
If the input dc is a voltage source, the inverter is called a Voltage Source Inverter (VSI). One can similarly think of a Current Source Inverter (CSI), where the input to the circuit is a current source. The VSI circuit has direct control over ‘output (ac) voltage’ whereas the CSI directly controls ‘output (ac) current.
Inverter is a device which convert a DC input supply voltage into symmetric AC voltage of desired magnitude and frequency at the output side. It is also know as DC-AC converter.
Ideal and practical inverter have sinusoidal and no-sinusoidal waveforms at output respectively.
If the input dc is a voltage source, the inverter is called a Voltage Source Inverter (VSI). One can similarly think of a Current Source Inverter (CSI), where the input to the circuit is a current source. The VSI circuit has direct control over ‘output (ac) voltage’ whereas the CSI directly controls ‘output (ac) current.
single phase half bridge inverter, full bridge inverter, parallel inverter, load commutated inverter with working and waveforms.
download and watch the animations. it will be effective.
single phase bridge inverter harmonic analysis.
Nowadays, it is very important to maintain voltage level. Controlling of that voltage is also important. This Presentation contains methods of voltage control.
Full Wave Rectifier Circuit Working and Theoryelprocus
Know about Full wave rectifier circuit working and theory. It is uses two diodes to produces the
entire waveform both positive and negative half-cycles. The full-wave rectifier allows us to convert
almost all the incoming AC power to DC.
1.SINGLE PHASE HALF WAVE CONTROLLED CONVERTER WITH RESISTIVEINDUCTIVE LOAD
2 SINGLE PHASE FULLY CONTROLLED CONVERTER WITH RESISTIVEINDUCTIVE LOAD
3 SPEED CONTROL OF 3-PHASE SLIP RING (WOUND ROTOR) INDUCTION MOTOR
4 THYRISTORISED DRIVE FOR DC MOTOR WITH CLOSED LOOP CONTROL
5 THYRISTORISED DRIVE FOR PMDC MOTOR WITH SPEED MEASUREMENT & CLOSED LOOP CONTROL
6 SPEED MEASUREMENT OF PMDC MOTOR WITH CLOSED LOOP CONTROL
7 IGBT USING SINGLE 4 QUADRANT CHOPPER DRIVE FOR PMDC MOTOR WITH SPEED MEASUREMENT AND CLOSED LOOP AND CONTROL
8 SINGLE PHASE CYCLO CONVERTER BASED AC INDUCTION MOTOR CONTROLLER
9 THREE PHASE INPUT THYRISTORISED DRIVE 3HP DC MOTOR WITH CLOSED LOOP CONTROL
10 THREE PHASE INPUT IGBT DRIVE FOR 4 QUADRANT CHOPPER OF 3HP DC MOTOR WITH CLOSED LOOP CONTROL
Power Electronics - Phase Controlled Converters.pptxPoornima D
A detailed analysis of the Controlled Converters with SCR. it contains a single-phase Fully controlled- Half Wave and Full Wave Rectifier with R, RL and RLC loads., Three Phase Fully controlled- Half Wave and Full Wave Rectifier with R, RL and RLC loads. Dual Converters. It also explains the effect of source inductance on the performance of converters
ER Publication,
IJETR, IJMCTR,
Journals,
International Journals,
High Impact Journals,
Monthly Journal,
Good quality Journals,
Research,
Research Papers,
Research Article,
Free Journals, Open access Journals,
erpublication.org,
Engineering Journal,
Science Journals,
Basics of Transformers, DC machine, Single phase and Three phase induction motors and Universal motors are provided here. Students of APJ Abdul Kalam Technological University (KTU) may find this helpful for their fifth module preparation.
A brief description of different types of tariffs is provided here. It also covers the basic concept of Electrical wiring systems and lighting systems. Working of different types of lamp with figures are also included.
Students of APJ Abdul Kalam Technological University (KTU) may find this helpful for their sixth module preparation.
Generation of Electrical Power - Power Plants and Transmission Systems.maneesh001
Basics of generation of electricity by thermal, hydro, nuclear and renewable sources are provided in this document.
Students of APJ Abdul Kalam Technological University (KTU) may find this helpful for their fouth module preparations.
A few basics about magnetism and Alternating currents.
Students of APJ Abdul Kalam Technological University (KTU) may find this helpful for their second module for the subject EE100 BASICS OF ELECTRICAL ENGINEERING.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
Honest Reviews of Tim Han LMA Course Program.pptxtimhan337
Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Acetabularia Information For Class 9 .docxvaibhavrinwa19
Acetabularia acetabulum is a single-celled green alga that in its vegetative state is morphologically differentiated into a basal rhizoid and an axially elongated stalk, which bears whorls of branching hairs. The single diploid nucleus resides in the rhizoid.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
1. MODULE 2
PHASE CONTROLLED RECTIFIER
2.1 Introduction
Unlike diode rectifiers, phase controlled rectifiers has and advantage of controlling the output
voltage. The diode rectifiers are called uncontrolled rectifiers. When these diodes are
replaced with thyristors, then in becomes phase controlled rectifiers. The output voltagecan
be controlled by varying the firing angle of the thyristors. These phase controlled rectifiers
has its main application in speed control of DC motors.
2.2 Application
Steel rolling mills, paper mills, textile mills where speed control of DC motors are
necessary.
Electric traction.
High voltage DC transmission
Electromagnet power supplies
In this module, the following categories of phase controlled rectifiers will be studied in detail.
1. Single Phase Half Wave Controlled Rectifier with R Load.
2. Single Phase Half Wave Controlled Rectifier with RL Load.
3. Single Phase Half Wave Controlled Rectifier with RL Load and Freewheeling Diode.
4. Single Phase Full Wave Controlled Rectifier with R Load.
5. Single Phase Full Wave Controlled Rectifier with RL Load.
6. Single Phase Full Wave Controlled Rectifier with RL Load and Freewheeling Diode.
7. Single Phase Full Wave Half Controlled Rectifier (Semi Converter).
8. Three Phase Half Wave Controlled Rectifier.
9. Three Phase Full Wave Controlled Rectifier
2. 2.3 Single Phase Half Wave Controlled Rectifier with R Load
The circuit consist of a thyristor T, a voltage source Vs and a resistive load R.
During the positive half cycle of the input voltage, the thyristor T is forward biased
but it does not conduct until a gate signal is applied to it.
When a gate pulse is given to the thyristor T at ωt = α, it gets turned ON and begins to
conduct.
When the thyristor is ON, the input voltage is applied to the load.
During the negative half cycle, the thyristor T gets reverse biased and gets tuned OFF.
So the load receives voltage only during the positive half cycle only.
The average value of output voltage can be varied by varying the firing angle α.
The waveform shows the plot of input voltage, gate current, output voltage, output
current and voltage across thyristor.
3.
4. 2.4 Single Phase Half Wave Controlled Rectifier with RL Load
The circuit consist of a thyristor T, a voltage source Vs, an inductive load L and a
resistive load R.
During the positive half cycle of the input voltage, the thyristor T is forward biased
but it does not conduct until a gate signal is applied to it.
When a gate pulse is given to the thyristor T at ωt = α, it gets turned ON and begins to
conduct.
When the thyristor is ON, the input voltage is applied to the load but due to the
inductor present in the load, the current through the load builds up slowly.
During the negative half cycle, the thyristor T gets reverse biased but the current
through the thyristors is not zero due to the inductor.
The current through the inductor slowly decays to zero and when the load current (i.e
the current through the thyristor) falls below holding current, it gets turned off.
So here the thyristor will conduct for a few duration in the negative half cycle and
turns off at ωt = β. The angle β is called extinction angle.
The duration from α to β is called conduction angle.
So the load receives voltage only during the positive half cycle and for a small
duration in negative half cycle.
The average value of output voltage can be varied by varying the firing angle α.
The waveform shows the plot of input voltage, gate current, output voltage, output
current and voltage across thyristor.
5.
6. 2.5 Single Phase Half Wave Controlled Rectifier with RL Load and
Freewheeling Diode
The circuit consist of a thyristor T, a voltage source Vs, a diode FD across the RL
load, an inductive load L and a resistive load R.
During the positive half cycle of the input voltage, the thyristor T is forward biased
but it does not conduct until a gate signal is applied to it.
When a gate pulse is given to the thyristor T at ωt = α, it gets turned ON and begins to
conduct.
When the thyristor is ON, the input voltage is applied to the load but due to the
inductor present in the load, the current through the load builds up slowly.
During the negative half cycle, the thyristor T gets reverse biased. At this instant i.e at
ωt = π, the load current shift its path from the thyristor to the freewheeling diode.
When the current is shifted from thyristor to freewheeling diode, the thyristor turns
OFF.
The current through the inductor slowly decays to zero through the loop R-
freewheeling diode-L.
So here the thyristor will not conduct in the negative half cycle and turns off at ωt = π.
So the load receives voltage only during the positive half cycle.
The average value of output voltage can be varied by varying the firing angle α.
The waveform shows the plot of input voltage, gate current, output voltage, output
current and voltage across thyristor.
7.
8. 2.6 Single Phase Full Wave Controlled Rectifier with R Load
The circuit consist of four thyristors T1, T2, T3 and T4, a voltage source Vs and a R
Load.
During the positive half cycle of the input voltage, the thyristors T1 & T2 is forward
biased but it does not conduct until a gate signal is applied to it.
When a gate pulse is given to the thyristors T1 & T2 at ωt = α, it gets turned ON and
begins to conduct.
When the T1 & T2 is ON, the input voltage is applied to the load through the path Vs-
T1-Load-T2-Vs.
During the negative half cycle, T3 & T4 is forward biased, the thyristor T1 & T2 gets
reverse biased and turns OFF
When a gate pulse is given to the thyristor T3 & T4 at ωt = π+α, it gets turned ON and
begins to conduct.
When T3 & T4 is ON, the input voltage is applied to the load Vs-T3-Load-T4-Vs.
Here the load receives voltage during both the half cycles.
The average value of output voltage can be varied by varying the firing angle α.
The waveform shows the plot of input voltage, gate current, output voltage, output
current and voltage across thyristor.
9.
10. 2.7 Single Phase Full Wave Controlled Rectifier with RL Load
A. MID POINT CONVERTER
The circuit consist of two thyristors T1 and T2, a center tap transformer, a voltage
source Vs and a RL Load.
During the positive half cycle of the input voltage, the thyristor T1 is forward biased
but it does not conduct until a gate signal is applied to it.
When a gate pulse is given to the thyristor T1 at ωt = α, it gets turned ON and begins
to conduct.
When the thyristor T1 is ON, the input voltage is applied to the load but due to the
inductor present in the load, the current through the load builds up slowly through the
path A-T1-Load-N-A.
During the negative half cycle, T2 is forward biased, the thyristor T1 gets reverse
biased but the current through the thyristor T1 is not zero due to the inductor and T1
does not turns OFF
The current through the inductor begins to decay to zero and T1 conducts for a small
duration in negative half cycle..
When a gate pulse is given to the thyristor T2 at ωt = π+α, it gets turned ON and
begins to conduct.
When the thyristor T2 is ON, the load current shifts its path from the T1 to T2 and
thyristor T1 turns OFF at ωt = π+α.
When T2 is ON, the current through the load builds up slowly through the path B-T2-
Load-N-B.
So here both the thyristor will conduct for a few duration in the negative half cycle.
The load receives voltage during both the half cycles.
The average value of output voltage can be varied by varying the firing angle α.
The waveform shows the plot of input voltage, gate current, output voltage, output
current and voltage across thyristor.
11.
12. B. BRIDGE CONVERTER
The circuit consist of four thyristors T1, T2, T3 and T4, a voltage source Vs and a RL
Load.
During the positive half cycle of the input voltage, the thyristors T1 & T2 is forward
biased but it does not conduct until a gate signal is applied to it.
When a gate pulse is given to the thyristors T1 & T2 at ωt = α, it gets turned ON and
begins to conduct.
When the T1 & T2 is ON, the input voltage is applied to the load but due to the
inductor present in the load, the current through the load builds up slowly through the
path Vs-T1-Load-T2-Vs.
During the negative half cycle, T3 & T4 is forward biased, the thyristor T1 & T2 gets
reverse biased but the current through them is not zero due to the inductor and does
not turns OFF
The current through the inductor begins to decay to zero and T1 & T2 conducts for a
small duration in negative half cycle..
When a gate pulse is given to the thyristor T3 & T4 at ωt = π+α, it gets turned ON and
begins to conduct.
When the thyristor T3 & T4 is ON, the load current shifts its path to T3 & T4 and
turns OFF T1 & T2 at ωt = π+α.
When T3 & T4 is ON, the current through the load builds up slowly through the path
Vs-T3-Load-T4-Vs.
So here all the thyristor will conduct for a few duration in the negative half cycle.
The load receives voltage during both the half cycles.
The average value of output voltage can be varied by varying the firing angle α.
The waveform shows the plot of input voltage, gate current, output voltage, output
current and voltage across thyristor.
13.
14. 2.8 Single Phase Full Wave Controlled Rectifier with RL Load and
Freewheeling Diode.
The circuit consist of four thyristors T1, T2, T3 and T4, a voltage source Vs, a RL
Load and a freewheeling diode across the load.
During the positive half cycle of the input voltage, the thyristors T1 & T2 is forward
biased but it does not conduct until a gate signal is applied to it.
When a gate pulse is given to the thyristors T1 & T2 at ωt = α, it gets turned ON and
begins to conduct.
When the T1 & T2 is ON, the input voltage is applied to the load but due to the
inductor present in the load, the current through the load builds up slowly through the
path Vs-T1-Load-T2-Vs.
During the negative half cycle (at ωt = π), T3 & T4 is forward biased, the thyristor T1
& T2 gets reverse biased.
The current shifts its path to the freewheeling diode and circulates through the loop
FD-R-L-FD.
Thus T1 & T2 turns off at ωt = π
When a gate pulse is given to the thyristor T3 & T4 at ωt = π+α, it gets turned ON and
begins to conduct.
When T3 & T4 is ON, the current through the load builds up slowly through the path
Vs-T3-Load-T4-Vs.
During the next positive half cycle (at ωt = 2π), T1 & T2 is forward biased, the
thyristor T3 & T4 gets reverse biased.
The current shifts its path to the freewheeling diode and circulates through the loop
FD-R-L-FD.
Thus T3 & T4 turns off at ωt = 2π
So here all the thyristor will conduct only in the positive half cycle.
The load receives voltage during both the half cycles.
The average value of output voltage can be varied by varying the firing angle α.
The waveform shows the plot of input voltage, gate current, output voltage, output
current and voltage across thyristor
15.
16. 2.9 Single Phase Full Wave Half Controlled Rectifier (Semi Converter)
The circuit consist of two thyristors T1 & T2, two diodes D1 and D2, a voltage source
Vs, a RL Load.
During the positive half cycle of the input voltage, the thyristors T1 & D1 is forward
biased but it does not conduct until a gate signal is applied to T1.
When a gate pulse is given to the thyristors T1 at ωt = α, it gets turned ON and begins
to conduct.
When the T1 & D1 is ON, the input voltage is applied to the load but due to the
inductor present in the load, the current through the load builds up.
During the negative half cycle (at ωt = π), T2 & D2 is forward biased, the thyristor T1
& D1 gets reverse biased.
The current shifts its path to D2 and T1 in case of symmetrical converter (D1 & D2 in
case of asymmetical converter) and circulates through the load.
When a gate pulse is given to the thyristor T2 at ωt = π+α, it gets turned ON and
begins to conduct.
When T2 & D2 is ON, the current through the load builds up.
During the next positive half cycle (at ωt = 2π), T1 & D1 is forward biased, the
thyristor T2 & D2 gets reverse biased.
The current shifts its path to D1 and T2 in case of symmetrical converter (D1 & D2 in
case of asymmetical converter) and circulates through the load.
The load receives voltage during both the half cycles.
The average value of output voltage can be varied by varying the firing angle α.
The waveform shows the plot of input voltage, gate current, output voltage, output
current and voltage across thyristor.
17.
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24. PERFORMANCE PARAMETER OF TWO PULSE CONVERTERS
1. SINGLE PHASE FULL CONVERTER
The instantaneous value of current in given by
is(t) =
The current attains its max value when = 1. Therefore,
Inmax =
RMS value of the n component is given by,
Isn = = =
RMS value of fundamental current, IS1 is given by,
Is1 = = 0.00932 Io
RMS value of total input current, IS is given by
Displacement factor is given by DF = cos α
Displacement factor is the measure of displacing in current and voltage with respect to time.
Power Factor, PF = DF × CDF
25. Harmonic factor, HF indicates the amount of harmonics present in the output. It is also called
THD, Total Harmonic Distortion. It is given by
Voltage ripple factor is given by
VRF =
Where Vor is the RMS value of output voltage of single phase fullwave rectifier and Vo is
the average output voltage of single phase fullware rectifier. Substituting the expression of
Vor and Vo in the above equations we get,
Active Power Input is given by,
Pi = rms value of source voltage ×
rms fundamental component of source current ×
displacement factor
Reactive power Qi is given by,
26. 2. SINGLE PHASE SEMI CONVERTER
The instantaneous value of current in given by
RMS value of nth harmonic current component is given by
RMS fundamental current component is given by
RMS value of total input current, IS is given by
Displacement factor is given by DF = cos
Current Distortion Factor, CDF is given by
Power Factor, PF = DF × CDF
Harmonic factor, HF indicates the amount of harmonics present in the output. It is also called
THD, Total Harmonic Distortion. It is given by
27. Voltage ripple factor is given by,
Where Vor is the RMS value of output voltage of single phase semi converter and Vo is the
average output voltage of single phase semi converter.
Active Power Input is given by Pi = VO IO
Reactive Power Input is given by Qi = VO IO tan
28. Circuit Diagram and Waveform of 3 Phase Half Controlled Rectifier with R Load
29. Circuit Diagram and Waveform of 3 Phase Half Controlled Rectifier with R Load
The circuit consist of a delta star transformer and 3 thyristors T1, T2, T3 which are connected on the
secondary star connected winding and a resistive load.
When Va is positive, T1 becomes forward biased and conducts. During the negative cycle of Va, T1
turns off.
Similarly T2 and T3 conducts only during the positive cycles of Vb and Vc respectively.
The average output voltage can be varied by varying the firing angles of the thyristors.
The waveforms shows the output voltage for various firing angles.
In the waveform, Va is denoted as Van, Vb as Vbn, Vc as Vcn.
30. Circuit Diagram and Waveform of 3 Phase Half Controlled Rectifier with RL Load
31. Circuit Diagram and Waveform of 3 Phase Half Controlled Rectifier with RL Load
The circuit consist of a delta star transformer and 3 thyristors T1, T2, T3 which are connected on the
secondary star connected winding and a RL load.
When Va is positive, T1 becomes forward biased and conducts. During the negative cycle of Va, the
current through T1 is not zero due to inductor present in the load.
So T1 will remain ON during the negative cycle of Va
When Vb is positive, T2 is triggered and the load current gets transferred from T1 to T2. At this
instant, T1 turns OFF.
During the negative cycle of Vb, the current through T2 is not zero due to inductor present in the
load.
So T2 will remain ON during the negative cycle of Vb
When T3 is triggered during positive cycle of Vc, the load current is transferred from T2 to T3. At
this instant, T2 turns OFF
Similarly T3 conducts during the negative cycle of Vc and turns OFF when T1 is triggered.
The average output voltage can be varied by varying the firing angles of the thyristors.
The waveforms shows the output voltage for various firing angles.
In the waveform, Va is denoted as Van, Vb as Vbn, Vc as Vcn.
32. Circuit Diagram and Waveform of 3 Phase Full Controlled Rectifier with RL Load
The circuit consist of 6 thyristors, T1, T2, T3, T4, T5, T6, a three phase supply and a RL load.
The thyristors T1, T3, T5 form the positive group.
The thyristors T4, T6, T2 form the negative group.
Thyristors T1, T3, T4, T6 produces the full wave recitified output of Vab across the load.
Thyristors T3, T5, T6, T2 produces the full wave recitified output of Vbc across the load.
Thyristors T1, T5, T4, T2 produces the full wave recitified output of Vca across the load.
All these 3 outputs are given simultaneously to the same RL load. The effect is that all the 3
individual output mentioned above gets superimposed on each other to get the final output.
The waveform of the output for different firing angles are shown below.
The average output voltage can be varied by varying the firing angle.
For firing angle < 90, the circuit works as rectifier.
For firing angle > 90, the circuit works as Line commutated inverter.