A Novel ZVS/ZCS Active-Clamping DC-DC Power Converter
Date Issued
2011
Date
2011
Author(s)
Hsia, Tsun-Hsiao
Abstract
In this dissertation, a novel ZVS/ZCS active-clamping DC-DC power converter configuration is proposed. It consists of two parts: the primary side is a constant-frequency asymmetrical converter with active clamp feature and the secondary side is a series resonant tank circuit. The energy stored in the magnetizing inductance of transformer is recycled to allow main/auxiliary switches turn-on at zero-voltage switching (ZVS) and the voltage stress of the main switches is clamped. In the secondary side the transformer leakage inductance and secondary resonant capacitance are employed by the series resonant tank to achieve zero-current switching of the output diodes. The circuit features constant-frequency operation and soft switching for both main transistors and the rectifier diodes. Interleaving operation of this configuration combines the benefits soft switching and low-profiled package. An 80-kHz, 500-Watt, 375-volt input, 170-volt output experimental circuit was demonstrated. Comparison with other configurations is also given. This configuration provides an attractive option for high-efficiency, low-noise, low-profiled and high-output-voltage DC-DC power conversion for application such as a plasma or a light-emitting diode display unit.
Subjects
Active-clamping converter
Interleave
ZVS (zero-current switching)
ZCS (zero-current switching)
Type
thesis
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