A high efficiency and high power factor rectifier using the BHB type AC-DC converter with the transformer of asymmetrical secondary windings

A high efficiency and high power factor AC-DC rectifier is proposed, which employs the combined circuit of boost and half-bridge (BHB) DC-DC converter that was recently developed to realize the high efficient DC-DC converter with low output voltage and is applied to AC-DC rectifier in this paper. The mechanism of reducing the commercial low frequency output voltage ripple is clarified and using a transformer of asymmetrical secondary windings, the current ripple through output inductor can be reduced. Furthermore, a novel rectifier circuit is proposed, which is used instead of bridge-diode rectifier for improving the power efficiency. As a result, the power efficiency is improved to 90.9% and low input current harmonic distortion factor satisfies IEC 61000-3-2 Class D when the AC input voltage and DC output are 100 V and 54 V/2 A, respectively