开关电源的谐波及其抑制

The Harmonics of Switch Power and Its Restraint

开关电源是一种性能很好的电源，它的体积小、重量轻、功耗小、效率高、调整范围宽．但是，目前的开关电源由于直接对市电进行桥式整流电容滤波，输入电流是一串串尖窄的脉冲，因而含有丰富的谐波，使电路的功率因数变低并对电网产生污染．本文对开关电源的存在问题进行了分析，并提出了一些改进方法。

Being a kind of functional power,switch power features on its small bulk,little weight,high effect and covers a wide range of adjustment.Nowadays,Switch power is directly bridge rectifying and capactance filtering the main power,but the input electric current is a scrics of pulsc which contains rich harmonics that make the powcr factor lower and pollute the electrified wire netting.The author analyses the problems of the switch power and their solutions.