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A Novel Bridgeless Single-Stage Half-Bridge AC/DC Converter

Author: W. Choi, W. Yu, and J. Lai, Virginia Polytechnic Institute and State University, U.S.A.

Source: IEEE Applied Power Electronics Conf., Feb. 21-25, 2010, Palm Springs, CA, pp.42-46

This paper proposes a new bridgeless single-stage half-bridge ac-dc converter. The proposed converter integrates the operation of the bridgeless power factor correction (PFC) boost rectifier and the asymmetrical pulse-width modulation (APWM) half-bridge dc-dc converter. The proposed converter provides high power factor and direct power conversion from the line voltage to an isolated dc output voltage without using the fullbridge diode rectifier. Conduction losses are lowered with a simple circuit structure. Switching losses are also reduced by achieving zero-voltage switching (ZVS) of the power switches. The effectiveness of the proposed converter is verified on a 250 W (48 V/5.2 A) experimental prototype.