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 the flyback converter with different operation modes

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DCM和CCM模式反激变换器分别具有类似于电流源和电压源外特性的结论。比较了CCM和DCM模式反激变换器的工作情况 ,指出根据负载选择工作模式的方法。详细地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 ,试验结果与理论分析一致。

In this paper ,steady principles of flyback converter with inductance continuous current mode,critical continuous mode and discontinuous mode are analyzed , the conclusion that flyback converter with DCM and CCM respectively has a similar output characteristic of current supply and voltage source is drawn.Performance of flyback converter with DCM and CCM is compared ,methods of selecting operation modes according to the load are pointed out.Design methods of the energy storage transformer are particularly presented. Prototypes of flyback converter are designed and experiments are made.Experimental results show agreement with the analysis.