The PWM choppercircuit and the selection of power switching elements, protecting circuits, driving units and software programming are given out.
主要内容包括PWM斩波电路结构及功率开关器件的选择，驱动电路，保护电路以及软件编程。
2
With the shift-phase modulated multiple choppercircuit, the equivalent switch frequency can be improved, so it can be used in large power occasion.
采用移相调制的多重斩波电路，可以提高等效开关频率，因此可应用在中大功率场合。
3
In this paper, using unity power factor PWM rectifier and choppercircuit, it establishes a new type of switching power supply about PWM input rectifier circuit.