An Isolated Three-Port Bidirectional LCLC Multi-Resonant DC-DC Converter
Li Wei1, Wang Yifeng2, Han Fuqiang2, Chen Bo2
1. School of Electrical and Electronic Engineering Tianjin University of Technology Tianjin 300384 China; 2. Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin 300072 China
Abstract：In this paper, an isolated multi-resonant bidirectional DC-DC converter is proposed. The LCLC resonant tank has three resonant frequencies, by parameters design, the three resonant frequencies are two series resonant frequencies of fundamental and third order and a second order parallel resonant frequency. The resonant tank can transfer the energy of fundamental and third order frequencies to increase efficiency of the converter. The resonant current is a superposition of the fundamental and third harmonics, which effectively reduces its peak value. Power transfer is managed by controlling the phase shift angles among three ports. By adjusting the driving frequency under different load conditions, zero voltage switching (ZVS) of all the switches in three ports is guaranteed. Therefore, lower switching loss and high efficiency are achieved in full load range. Besides, in the proposed structure, leakage inductors of transformer are integrated into the resonant inductors, weakening the adverse effects of leakage inductors. At last, a 1.5kW prototype is built to verify the reliability and feasibility of the proposed topology. The maximum efficiency in the forward and reverse operating conditions is 96.7% and 96.9% respectively. When the power is above 0.5kW, the bidirectional efficiency is higher than 95.5%, which improves that the proposed converter has high efficiency in the whole load range.
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2018, Vol. 33 
