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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。
Switching power supply is the development direction of power supply, but switching power supply low power factor. Its input current waveform serious distortion, the harmonics contained interfere with the power grid, so how to improve the switching power supply power factor, harmonic suppression, reduce the interference to the power grid is an important issue. In this paper, three commonly used methods to suppress harmonics and improve power factor-series resonance filter, parallel resonant filter and step-up converter are studied. Show that the active step-up converter is to improve the switching power supply power factor of the best way.