应用二次谐波注入抵消原理的无源单相低谐波整流装置

Harmonic Current Counteracting Method in a Passive Single-PhaseDiode Bridge Rectifier by Second Harmonic Current Injection

提出一种明显改善单相桥式整流装置的交流输入电流波形的新颖方法。它的基本原理思想是通过增加一无源谐振电路，将单相桥式整流固有的二次谐波电流正、反相交替注入交流输入端，来抵销电流中所含的大部分谐波分量，使交流电流波形的ＴＨＤ从原来的５０％左右下降到小于１０％（最佳的实验结果约为６％）。利用这一思想，我们开发出了低成本的无功耗的无源单相低谐波整流装置。

This paper presents a novel method of reducing harmonic currents caused by an single-phase bridge rectifier.By adding an additional passive resonant net,the inherent second harmonic current of the rectifier can be reversed every other cycle,then be injected into the supply side to counteract most of harmonic currents of the rectifier.Thus the Total Harmonic Distortion(THD)of the current can be reduced from 50% to 10%(the best result of laboratary recordings is 6%).Based on the counteracting principle,a very cheap,power lossless and passive singlephase rectifier with lower harmonics has been developed.