A Dual Transformer-Structured Multi-Resonant Soft-Switching DC-DC Converter
Wang Yifeng1, Han Fuqiang1, Yang Liang1, Chen Bo1, Lin Song2
1. Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin 300072 China; 2. State Grid Jibei Electric Power Co. Ltd Maintenance Branch Beijing 102488 China
Abstract：：A dual transformer-structured multi-resonant soft-switching DC-DC converter is proposed in this paper. Through the introduction of high-frequency transformers into the resonant tank, the converter obtains several resonant points including a unique resonant zero point. By properly configuring the resonance point position, the converter is able to transmit the 1st and the 3rd harmonic active power simultaneously in a wide frequency range. Thus, it contributes to the improved utilization rate of the resonant current and the reduced reactive circulation in the resonant tank. Moreover, inherent over-current protection is also obtained for the converter thanks to the adoption of the resonant zero point. Besides, the converter achieves the excellent turn-on zero-voltage switching (ZVS) for all the power switching devices in the primary side. Meanwhile, all the diodes in the secondary side realize the turn-on zero-current switching (ZCS) and turn-off zero-current quasi-soft-switching (Q-ZCS). Therefore, high conversion efficiency is assured due to the switching loss restricted effectively. To verify the feasibility of the proposed converter and the rationality of parameter design method, a 330W prototype is built in the laboratory. The maximum efficiency is 94.7% for experimental tests.
王议锋, 韩富强, 杨良, 陈博, 林松. 一种双变压器结构的多谐振型软开关直流变换器[J]. 电工技术学报, 2019, 34(4): 738-746.
Wang Yifeng, Han Fuqiang, Yang Liang, Chen Bo, Lin Song. A Dual Transformer-Structured Multi-Resonant Soft-Switching DC-DC Converter. Transactions of China Electrotechnical Society, 2019, 34(4): 738-746.
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2019, Vol. 34 
