A Parallel-Output CLTCL Multi-Element Resonant Soft-Switching DC-DC Converter
Han Fuqiang1, Wang Yifeng1, Yang Liang1, Chen Mengying1, Zhou Biao2
1. Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin 300072 China; 2. State Grid Tianjin Dongli District Power Supply Company Tianjin 300300 China
Abstract：In this paper, a novel parallel-output type CLTCL multi-element resonant soft- switching DC-DC converter is proposed. It employs the dual transformers architecture, whose secondary sides are connected in parallel. The resonant tank contains multiple resonant components of capacitors and inductors. Through appropriate parameter design, the converter can transmit the fundamental and 3rd harmonic active power simultaneously, increasing the utilization of the resonant current and ensuring high efficiency conversion. Widely adjustable range of DC voltage gain is also achieved within a narrow frequency range. Besides, all the power switching devices have obtained the turn-on zero-voltage soft-switching (ZVS), and all the diodes realize the turn-on and turn-off zero-current soft-switching (ZCS) or quasi-soft-switching. The leakage inductance of the dual transformers is absorbed by the corresponding series resonant inductor. They also participate in the resonance process, which weakens the adverse effects of the parasitic parameters on the circuit. To verify the feasibility of the circuit design, a 500W prototype is tested. The proposed converter can achieve high efficiency of nearly 95% over a wide load range with a maximum efficiency point of 95.4%. The voltage gain is adjustable from half rating value to the rating value in the frequency range of 20% near the rating point.
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2018, Vol. 33 
