电力电子技术第四版课后题答案第一章（Power electronics technology fourth edition, after-school questions, answers Chapter 1）.docVIP

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电力电子技术第四版课后题答案第一章（Power electronics technology fourth edition, after-school questions, answers Chapter 1）.doc

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电力电子技术第四版课后题答案第一章（Power electronics technology fourth edition, after-school questions, answers Chapter 1）

电力电子技术第四版课后题答案第一章（Power electronics technology fourth edition, after-school questions, answers Chapter 1） The first chapter, power electronic device 1. what are the conditions for thyristor switching on? Answer: the condition that the thyristor is switched on is that the thyristor receives the positive anode voltage and applies a trigger current (pulse) at the gate. Or: uAK0 and uGK0. 2. what are the conditions for maintaining the thyristor conduction? How to make the change for the thyristor turn off? Answer: the condition of maintaining the thyristor conduction is to make the thyristor current greater than the minimum current to maintain the thyristor current, that is, to maintain current. To make the thyristor conduction by change off current, applied voltage and the external circuit can be used to make the role through the thyristor is reduced to a value close to zero, that is to maintain the current, can make the thyristor turn-on switch off. 3. the shadow part in Fig. 1-43 is the current waveform of the thyristor in the pass section. The maximum current value of each waveform is Im. The current average value of each waveform is calculated by Id1, Id2, Id3 and current effective values I1, I2 and I3. Fig. 1-43 thyristor conduction waveform Solution: a) Id1= = () 0.2717 Im I1= = 0.4767 Im B) Id2 = = () 0.5434 Im I2 = = 0.6741I C) = Id3= = Im I3 = = Im On the 4. question if you do not consider the safety margin, ask 100A thyristor, Id3 Id2 Id1, the average current can be sent for? At this time, corresponding to the current maximum value of Im1, Im2, Im3 each? Solution: rated current I T (AV) =100A thyristor, allowing current effective value I =157A, calculated by the results of the above title A) Im1 329.35, Id1 0.2717, Im1 89.48 B) Im2 232.90, Id2 0.5434, Im2 126.56 C) Im3=2, I = 314, Id3=, Im3=78.5 5. GTO and common thyristors are PNPN structures. Why does GTO turn off itself, and ordinary thyristors do not? Answer: GTO and ordinary thyristor with PNPN structure