Abstract
Capacitive power transfer (CPT) is only considered to transfer low power at a short distance in the past few decades. To optimize the transmission characteristics, the double-sided LC compensation circuit for the CPT system is proposed. However, the capacitive coupler and compensation components of the double-sided LC compensated CPT system suffer very high voltage stresses due to very small coupling capacitances. It will reduce the reliability and security of the CPT system. With the fundamental harmonics approximation (FHA) method, this paper systematically analyzes a double-sided LC compensated CPT system. The input zero-phase angle (ZPA) frequency for load-independent constant current (CC) output is derived. The parameters of the double-sided LC compensated CPT system is designed to realize the reduction of voltage stresses among coupler plates and compensation components. The sensitivities of input impedance, output current to the variations of compensation parameters are also discussed to realize soft switching. Finally, a prototype of CPT converter with two types of proposed parameters and symmetric parameters is built to verify the analysis.
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