提高开关电源功率因数的方法

ON THE METHOD FOR IMPROVING THE POWER FACTOR OF A SWITCH-MODE POWER SUPPLY

开关电源是电源的发展方向，但开关电源功率因数很低。它的输入电流波形严重畸变，所含谐波对电网有干扰，故如何提高开关电源的功率因数，抑制谐波，减小对电网的干扰是一个重要课题。本文对抑制谐波、改善功率因数的三种常用方法──串联谐振滤波器、并联谐振滤波器和升压式变换器进行了试验研究。表明有源升压式变换器是提高开关电源功率因数的最好方法。

The commonly used switch-mode power supply shows itself a low power factor,due to its high harmonic currents.Its input current wave is significantly distored.The harmonic waves involved disturbes the power system,and therefore,how to improve the power factor of a switch-mode power supply,and to reduce the disturben become a problem for research and has been focused more and more attention from the powe-relectronic industry.This paper presents an experimental research on three methods for restricting harmonic currents and improving the power factor,namely methods of series connected resonant filters,of paralled connected resonant filters and of active boost converters.