Affiliations: [a] State Key Laboratory of Power Transmission Equipment {&} System Security and New Technology, Chongqing University, Chongqing 400044, China | [b] College of Automation, Chongqing University, Chongqing 400044, China
Correspondence:
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Corresponding author: Yu-Gang Su, College of Automation, Chongqing University, Chongqing 400044, China. Tel.: +86 18996016298; E-mail:[email protected]
Abstract: The capacitive power transfer (CPT) technology is a novel
solution to transfer power wirelessly by using electric field. Although
there is an insulating layer on the coupling plates, leakage electric field
is still existing around the plates. So there might have an electric shock
hazard when a human body touches the conductors placed around the coupling
plates. To solve this problem, an equivalent capacitor model of the metallic
conductor and the coupling plate is established. Besides, a human body
impedance model is introduced to obtain equivalent circuits of the CPT
system when a human touches the conductor. The formulas of the four coupling
plate voltages are derived for a full bridge series resonant CPT system.
Moreover, the distributed voltages of the conductor placed above different
coupling plates are given. The correctness of the theoretical analysis has
been verified by the experimental results.
Keywords: Capacitive power transfer (CPT), coupling plate, distributed voltage, safety issues
