混沌开关电源输出端有源滤波器的设计

Design of active filter for output circuit of power converter

混沌扩频技术是从源头上改善高频开关电源EMC特性的一种有效方法,但同时开关电源输出电压的纹波会随频率调制系数的增大而有所增加。为使输出电压的纹波降低到原来的水准,本文在开关电源的输出端增加一个简单的有源滤波器。这个有源滤波器结构简单、成本低、体积小、对开关电源输出电压的动态特性影响不大。本文主要阐述这个有源滤波器的设计。

Chaotic spectrum-spread technology is advantageous in improving EMC of power converters, but it increases ripple of output voltage. For suppressing the ripple of output voltage, we suggest adding an active filter to the output circuit of power converter. The active filter has simple construction, small size and low cost. It has little effect to the dynamic characteristic of power converter.