Answered: What is the relationship of the gate…

What is the relationship of the gate pulses to the two thyristors in a full-wave ac phase control circuit? Explain why a diode is connected across the output terminals of a buck chopper.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.2P

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What is the relationship of the gate pulses to the two thyristors in a full-wave ac phase control circuit?
Explain why a diode is connected across the output terminals of a buck chopper.

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11. Why is the conduction angle greater with an inductive load than with a purely resistive load? 12. For a full-wave phase control circuit draw the output voltage and current waveforms when firing angle α = (45-X)° (Here X= 10). Consider the load to be inductive. 13. What point in a single-phase ac waveform is used as a reference point for timing the thyristor gate pulses?
12. For a full-wave phase control circuit draw the output voltage and current waveforms when firing angle α = (45-X)° (Here X= 10). Consider the load to be inductive. 13. What point in a single-phase ac waveform is used as a reference point for timing the thyristor gate pulses?
17. Explain why a diode is connected across the output terminals of a buck chopper. 18. Briefly describe the effects the switching control signal frequency has on the output voltage and current of a boost chopper.
15. What is the relationship of the gate pulses to the two thyristors in a full-wave ac phase control circuit? 16. A buck chopper is powered by a 200-V dc power supply. What is the output voltage range of this chopper if the duty cycle can be varied between 30 and 95%?
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