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Analysis and Design of Hybrid Inductive and Capacitive Wireless Power Transfer System

IPT system needs capacitor to compensate the system, while CPT system requires inductor to tune the system. Therefore, a hybrid system is one of the possible solutions to compensate the IPT coupler with CPT ones and vice versa. In this paper, an Inductive and capacitive hybrid wireless power transfer (HWPT) system is proposed to improve the system coupler anti-misalignment ability. The couplers of IPT and CPT are employed together to compensate each other and transfer power together. Superposition theory is used to analyze the system working principle in detail. With the analysis results, a scaled-down system is built to validate the performance of the proposed approach. Experimental results show that the proposed HWPT system can achieve 655 W output power with 85.82% DC-DC efficiency at the well-aligned condition, and the maximum variation of output power is only 10% with the coupler misalignment from 0-270 mm, which agree well with analysis results.