A Design of the Snubber Circuit for Flyback Converter

The transformer is the core of the flyback switching power supply,the coorbing states of the flyback converter were analysed in detail,but the leakage inductance of the transformer in the switching process pipe segment is large,which may lead to output voltage spikes.Through the analysis of a flyback converter,we compare circuit RCD snubber circuit with LCD absorption circuit about the effect on their energy conversion.The clamping voltage of the RCD snubber circuit is reduced with the resistance decrease,but the loss increased;the LC resonance frequency of LCD snubber circuit requires less than the switching frequency;energy feedback clamping voltage of the buffer circuit is low,and it has not need of additional inductor.Eventually gives the LCD absorption circuit design methods,in order to achieve a good effect to reduce the spike voltage on the circuit performance.