文档介绍：2010-2011学年第1学期
《Power Electronic Devices》测验A
课程代码考试方式闭卷考试时长 100 分钟
姓名学号教学班号专业级班
得分
一、Fills up the topic
1、In single-phase bridge fully-controlled rectifier with R-L load,(L is large enough) the thyristor voltage UFM is___________ URM is_________
2、In single-phase half-wave controlled rectifier with resistance load, the range of the delay angle is________.
3、In three-phase half-wave controlled rectifier with resistance load, the current will be constant when the delay angle is_______________________.
4、In single-phase bridge half-controlled rectifier, the method to avoid out of control is________________________.
得分
二、Replies simply
1、What is the advantage and disadvantage of half wave rectifier and bridge rectifier? Which is often well used in the practice?
2、With small ripple approximation, design a chopper which can output dc 24v, which input voltage is dc18v.
3、What are the necessary conditions for the inverter mode operation of controlled rectifiers?
得分
三、Calculate
1、In the Single-phase bridge half-controlled rectifier, the input voltage of the transformer is ac 220v and the load is resistance and big inductance with Additional freewheeling