IEICE Communications Express
Online ISSN : 2187-0136
ISSN-L : 2187-0136
Representation of an equivalent circuit for capacitive wireless power transfer using a distributed-constant circuit
Yasumasa NakaMasaya Tamura
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2020 Volume 9 Issue 10 Pages 457-463


Capacitive wireless power transfer is performed using large electrodes or using a medium having high relative permittivity such as water. The transfer efficiency demonstrates a pronounced change with frequency. A lumped-constant equivalent circuit with parasitic elements represents the change. However, a relationship between conditions for generating minimum/maximum values of the transfer efficiency and structural parameters of the electrodes in the coupler has not clarified. In this study, an equivalent circuit is proposed using a distributed-constant circuit. We converted the lumped-constant circuit into two open-ended directional couplers. From the result, we derived the conditions for generating the minimum and maximum values of the voltage input/output ratio. The efficiencies calculated by the distributed-constant circuit and electromagnetic simulation were in good agreement.

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© 2020 The Institute of Electronics, Information and Communication Engineers
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