A Parallel-Connected Hybrid Inductive and Capacitive Coupler With Double-Sided LCL Compensation Topology

With a combination of the parallel compensated inductive and capacitive coupler, a hybrid coupler is proposed to take full advantage of the resonant components. The basic characteristics of the hybrid coupler are analyzed. To transfer the voltage excitation provided by the inverter into the current excitation, a double-sided LCL compensation topology is added and designed to work at the resonant frequency, so that it has no effect on the basic characteristics of the coupler. Based on the basic characteristics, a discussion of the voltage and current stress is conducted. The experiments are conducted with a 100 W output hybrid power transfer (HPT) system, achieving a DC-DC efficiency of 77.8%. The experimental results show that the proposed hybrid coupler can realize a unity current gain, which is in coincidence with the basic characteristics. Moreover, the measured voltage and current stress show good agreement with the calculated values, verifying the accuracy of the stress analysis.