NOVEL PASSIVE RECTIFIER WITH LOW THD BASED ON HARMONIC INJECTING AND COUNTERACTING PRINCIPLE

The paper presents a novel solution to the problem of harmonic polluti on caused by an AC/DC single-phase bridge rectifier. By adding an addi tional passive resonant net, the inherent second harmonic current of t he traditional rectifier can be phase-reversed every other period and then be forced to inject into the AC supply side to counteract most of the harmonic currents. The total harmonic distortion (THD) of the sup ply current can be reduced from 50% to similar to 10%. Based on the ha rmonic injecting and counteracting principle, a very cheap, lossless a nd passive single-phase rectifier with low THD and unity gower factor has been developed.