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Zero-Current-Switching in Full-Bridge DC-DC Converters Based on Activity Auxiliary Circuit
Enhui Chu¢Ó, Ping Lu*, Chang Xu*, and Jianqun Bao*
Abstract Aiming at the problem of circulating current loss in the traditional zero-current switching (ZCS) full-bridge (FB) DC/DC converter, a novel ZCS FB DC/DC converter topology and modulation strategy are proposed in this paper. It can achieve ZCS turn on and zero-voltage and zero-current switching (ZVZCS) turn off for the primary switches and realize ZVZCS turn on and zero-voltage switching (ZVS) turn off for the auxiliary switches and its resonant circuit power is small. Compared with the traditional phase shift full-bridge converter, it decreases circulating current loss and does not increase the current stress of the primary switches and the voltage stress of the rectifier diodes. The diodes turn off naturally when the current decreases to zero, thus, there is no reverse recovery current and loss on diodes. This paper analyzes the operating principle, steady-state characteristics and soft-switching conditions and range of the converter in detail. A 740V/1kW, 100 kHz experimental prototype was established, verifying the effectiveness of the converter through experimental results.
Keyword Full-bridge Converter, Zero-current switching (ZCS), Circulating current loss, Turn-off losses, Rectifier diodes
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