Improved Dual Active Bridge Bidirectional DC-DC Converter with Four-Winding Transformer Structure
Liu Feilong, Zhang Han, Sun Xiaofeng, Zhang Huixin, Wu Junjuan
Key Lab of Power Electronics for Energy Conservation & Motor Drive of Hebei Province School of Electrical Engineering Yanshan University Qinhuangdao 066004 China
Abstract：In this paper, an improved dual-active bridge bidirectional converter (DAB) topology with four-winding transformer structure based on traditional DAB is proposed. It is based on the conventional DAB transformer that the center taps of the primary and secondary winding are taken out and are connected to the midpoints of the voltage dividing capacitors on both sides respectively. In the applications with both buck and boost requirements, triple phase shift (TPS) control is used, which retains the advantages of traditional DAB, and the center taps on both sides provide a zero voltage switching (ZVS) reverse current for the switches with the worst soft-switching condition on the primary and secondary sides at low power levels, further broadening the soft-switching range. In this paper, the topology evolution process and basic circuit structure of the improved bidirectional converter were introduced firstly, and the delta equivalent circuit model was derived by equivalent simplification of the circuit. The working mode of the circuit in the TPS modulation mode was classified, and the steady state working process of the circuit was analyzed by taking the forward mode (Ⅰ-1) A as an example. Next, the soft switching characteristics of the converter were analyzed. When the voltage gain was in the boost and buck characteristics respectively, the intra-bridge phase shift angles ϕ1 and ϕ2 were used as the main variables in the control process to control the soft switching in the full power range. Finally, a 1kW experimental prototype was established to verify the correctness of the above analysis.
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2019, Vol. 34 
