Wide ZVS Range Asymmetric Half-Bridge Converter With Clamp Switch and Diode for High Conversion Efficiency

A conventional asymmetrical half-bridge (AHB) converter is widely used for dc-dc stage in low-to-medium power system. However, since the asymmetric operation of AHB converter causes the low efficiency over entire load condition, the conventional AHB converter is not usually considered for the candidate of server power system. In order to overcome the problems of the conventional AHB converter, a wide zero-voltage-switching (ZVS) range AHB converter with a clamp switch and a clamp diode is proposed in this paper. The proposed AHB converter (PAHBC) replaces a low-side clamp diode with a MOSFET switch and adds an auxiliary winding, which changes the transformer turns-ratio. From these modifications and the pulsewidth-modulation (PWM) control of clamp switch, the PAHBC can be designed optimally at nominal input condition and obtains additional dc gain at hold-up time condition. These advantages achieve the high conversion efficiency over the entire load condition. The operational principle and analysis of the PAHBC are presented in this paper and verified by a 340-400 V input and 50 V/500 W output laboratory prototype
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2016-05
Language
English
Keywords

DC-DC CONVERTER; ZERO-VOLTAGE; DC/DC CONVERTER; AUXILIARY TRANSFORMER; DESIGN CONSIDERATIONS

Citation

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, v.63, no.5, pp.2862 - 2870

ISSN
0278-0046
DOI
10.1109/TIE.2016.2515567
URI
http://hdl.handle.net/10203/209506
Appears in Collection
EE-Journal Papers(저널논문)
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