Hybrid PWM rectifiers to reduce electromagnetic interference

A hybrid PWM rectifier is proposed as a method to reduce the electromagnetic interference. The hybrid PWM rectifier consists of parallel-connected two component bridge circuits, that is, main and auxiliary bridge circuits. The main bridge circuit to handle the active power has a full current rating and a low switching frequency. The auxiliary bridge circuit to improve the input current waveform has a small current rating and a high switching frequency. Because the high-frequency switching of the full current can be avoided in the hybrid rectifier, the EMI can be reduced. The effectiveness of the proposed hybrid PWM rectifier is demonstrated by some experimental results.