Hybrid DC-DC Converter with Low Switching Loss, Low Primary Current and Wide Voltage Operation

Bor-Ren Lin and Yi-Kuan Lin
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Bor-Ren Lin: Department of Electrical Engineering, National Yunlin University of Science and Technology, Yunlin 640, Taiwan
Yi-Kuan Lin: Department of Electrical Engineering, National Yunlin University of Science and Technology, Yunlin 640, Taiwan

Energies, 2021, vol. 14, issue 9, 1-17

Abstract: A full-bridge converter with an additional resonant circuit and variable secondary turns is presented and achieved to have soft-switching operation on active devices, wide voltage input operation and low freewheeling current loss. The resonant tank is linked to the lagging-leg of the full bridge pulse-width modulation converter to realize zero-voltage switching (ZVS) characteristic on the power switches. Therefore, the wide ZVS operation can be accomplished in the presented circuit over the whole input voltage range and output load. To overcome the wide voltage variation on renewable energy applications such as DC wind power and solar power conversion, two winding sets are used on the output-side of the proposed converter to obtain the different voltage gains. Therefore, the wide voltage input from 90 to 450 V ( V in,max = 5 V in,min ) is implemented in the presented circuit. To further improve the freewheeling current loss issue in the conventional phase-shift pulse-width modulation converter, an auxiliary DC voltage generated from the resonant circuit is adopted to reduce this freewheeling current loss. Compared to the multi-stage DC converters with wide input voltage range operation, the proposed circuit has a low freewheeling current loss, low switching loss and a simple control algorithm. The studied circuit is tested and the experimental results are demonstrated to testify the performance of the resented circuit.

Keywords: phase-shift PWM converter; resonant converter; ZVS; circulating current (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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