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电力电子技术
第四版
课后习题答案
目录
第1章电力电子器件···················································································1
第2章整流电路·························································································4
第3章直流斩波电路·················································································20
第4章交流电力控制电路和交交变频电路······················································26
第5章变电路·······················································································31
第6章PWM控制技术···············································································35
第7章软开关技术····················································································40
第8章组合变流电路·················································································42
1
第1章电力电子器件
1.使晶闸管导通的条件是什么？
答：使晶闸管导通的条件是：晶闸管承受正向阳极电压，并在门极施加触发电流（脉冲）。
或：u0且u0。
AKK
2.维持晶闸管导通的条件是什么？怎样才能使晶闸管由导通变为关断？
答：维持晶闸管导通的条件是使晶闸管的电流大于能保持晶闸管导通的最小电流，即维持
电流。
要使晶闸管由导通变为关断，可利用外加电压和外电路的作用使流过晶闸管的电流降
到接近于零的某一数值以下，即降到维持电流以下，便可使导通的晶闸管关断。
3.图143中阴影部分为晶闸管处于通态区间的电流波形，各波形的电流最大值均为
I，试计算各波形的电流平均值I、I、I与电流有效值I、I、I。
123123
0205202
4442
图143晶闸管导电波形
1I2
解：IItdt10.2717I
1
2π2π2
4
12I31
IItdt0.4767I
1
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