| Title |
A Bridgeless Half-Bridge AC-DC Converter with High-Efficiency |
| Authors |
Woo-Young Choi ; 柳Ju-Seung Yoo ; Jae-Yeon Choi |
| DOI |
10.6113/TKPE/2011.16.3.293 |
| Keywords |
Power factor correction (PFC); Half-bridge converter; Zero-voltage switching (ZVS); Bridgeless; Full-bridge diode rectifier |
| Abstract |
This paper proposes a bridgeless half-bridge AC-DC converter with high-efficiency. The proposed converter integrates the bridgeless power factor correction (PFC) circuit with the asymmetrical pulse-width modulated (APWM) half-bridge DC-DC converter. It provides the isolated DC output voltage from the AC line voltage without using any full-bridge 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. By using series-connected two transformers, the proposed converter provides a low-profile and high power density for AC-DC converters. The performance of the proposed converter is verified from a 250 W (48 V / 5.2 A) experimental prototype circuit at 90 Vrms line voltage. |