开关电源输入平波电路的设计与实现

Design & realization of input smoothing circuit in switching power supply

介绍了基于二端口网络的开关电源输入平波电路设计的一般原理和方法。该方法通过对平波电路输入导纳和输出阻抗的设计,能保证平波电路在对高频分量具有良好平波效果的同时,尽可能减小对低频分量的衰减,而且在平波的同时不影响电源的负荷能力。依据该原理设计的四阶直流线路平波器应用到了工程实际,运行结果表明该原理具有良好的工程实践性。

This paper presents the general principle and method of inputing smoothing circuit design in switching power supply, which is based on the theory of dual-port network . The scheme can ensure the excellent smoothing effect on the high-frequency components, lower the attenuation on the low-frequency components and the load capacity maintenance while running, with the designs of input conductance and output impedance. The four-step DC line smoothing circuit, which is designed according to this principle, has been applied to practice. And the operating result demonstrates its good engineering feasibility.