Unified Theory of Series, Parallel and LCL/CLC Resonant Circuits in Inductive Power Transfer and Capacitive Power Transfer

This paper provides a general and systematic comparison of the transmission characteristics of series, parallel and LCL/CLC resonant circuits of both Inductive Power Transfer (IPT) and Capacitive Power Transfer (CPT). The transmission characteristics are CC/CV characteristic, efficiency, and output power when the power source is a voltage source or a current source. In terms of maximum efficiency, it was found to be common regardless of the transmission method or circuit. In terms of output power, it was found that when using a voltage source, high power was obtained by setting the transmitter side to S in IPT and the transmitter side to S or CLC in CPT. It was also found that when using a current source, high power was obtained by setting the transmitter side to P or LCL in IPT and the transmitter side to P in CPT. Furthermore, it was found that IPT obtains high power when the transmitter side circuit has the CV characteristic and CPT obtains high power when the transmitter side circuit has CC characteristic. In conclusion, S-S, S-LCL, LCL-S, LCL-P, and LCL-LCL are superior in IPT and S-CLC, P-P, P-CLC, CLC-P, and CLC-CLC are superior in CPT.