反激变换器不同工作模式时的稳态分析与设计

Steady Analysis and Design of Flyback Converter with Different Working Mode

本文分析了反激变换器在电感电流连续模式(CCM)、临界连续模式、断续模式(DCM)时的稳态原理,得出了CCM和DCM模式下反激变换器分别具有类似于电压源和电流源外特性的结论。文中比较了CCM和DCM模式反激变换器的工作情况,指出了根据负载选择工作模式的方法。详细介绍了反激变换器中储能式变压器的设计方法,进行了反激变换器原理样机的设计与试验,并得出了试验结果与理论分析一致的结论。

This paper analyzes steady principles of flyback converter with inductance continuous current mode(DCM), critical continuous mode(CCM) and discontinuous mode.It draws a conclusion that flyback converter with DCM and CCM respectively has a similar output characteristic of current supply and voltage source. This paper compares performance of flyback converter with DCM and CCM,provides a method of selecting operation modes according to the load,and introduces the design method of the energy transformer in detail.It designs and tests prototypes of flyback converter and makes a conclusion that experiment results agree with the analysis.