A High-Efficiency Isolated LCLC Multi-Resonant Three-Port Bidirectional DC-DC Converter
In this paper, an isolated multi-resonant three-port bidirectional direct current-direct current (DC-DC) converter is proposed, which is composed of three full bridges, two inductor-capacitorinductor-capacitor (LCLC) multi-resonant tanks and a three-winding transformer. The phase shift control method is employed to manage the power transmission among three ports. Relying on the appropriate parameter selection, both of the fundamental and the third order power can be delivered through the
... through the multi-element LCLC resonant tanks, and consequently, it contributes to restrained circulating energy and the desirable promoted efficiency. Besides, by adjusting the driving frequency under different load conditions, zero-voltage-switching (ZVS) characteristics of all the switches of three ports are guaranteed. Therefore, lower switching loss and higher efficiency are achieved in full load range. In order to verify the feasibility of the proposed topology, a 1.5 kW prototype is established, of which the maximum efficiencies under forward and reverse operating conditions are 96.7% and 96.9% respectively. In addition, both of the bidirectional efficiencies maintain higher than 95.5% when the power level is above 0.5 kW. The isolated TP-BDC exhibits pronounced advantages over its two counterparts, since the three-port power exchanges are realized through a three-winding high-frequency transformer, and the completely galvanic isolation is also ensured. Furtherly, among the numerous previously published references         about isolated TP-BDCs, two more detailed main sub-classifications are used: the triple-active-bridge (TAB) converter shown in Figure 1a and the series-resonant TP-BDC (SR-TP-BDC) in Figure 1b . designed the main parts of the study, including the circuit simulation model, topology innovation and simulation development. Fu-Qiang Han and Bo Chen helped in the hardware development and experiment. Conflicts of Interest: The authors declare no conflict of interest.