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An Optimization Method of Dual-Side LCC Compensation Networks Simultaneously Considering Output Power and Transmission Efficiency in Two Directions for BWPT Systems

This article presents an optimization method of dual-side LCC compensation networks for bidirectional wireless power transfer systems, which aims to simultaneously realize the rated forward and reverse output power directly through compensation network designing. In addition, due to that the optimization results of compensation networks are close to the values that meet the condition of the maximum transmission efficiency, good system efficiency in the two directions can be simultaneously obtained under the rated condition. Firstly, an equivalent circuit of bidirectional power converter (BPC) working in rectification mode is established, which includes the parasitic and external parallel capacitance of metal oxide semiconductor (MOS) devices. Also, its equivalent impedance is calculated. Then, considering the reactance part of the BPC equivalent impedance, the optimization method of the dual-side LCC compensation networks is analyzed. Finally, a 3.3 kW BWPT prototype is developed to verify the proposed method. The simulation and experiment results showed that the effect of the parasitic and parallel capacitance of MOS devices, on the reactance part of BPC equivalent impedance is more obvious; the proposed optimization method can simultaneously realize the rated forward and reverse output power, and both forward and reverse transmission efficiency are greater than 94% under the rated condition.