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access icon free LC–CLC compensation topology for capacitive power transfer system to improve misalignment performance

© The Institution of Engineering and Technology
Received 23/06/2018, Accepted 13/11/2018, Revised 17/10/2018, Published 14/11/2018

To improve the coupler misalignment performance, this study proposes an LC–CLC compensation topology for high-power and long-distance capacitive power transfer system. The LC circuit in the transmitter and the CLC circuit in the receiver are adopted as the resonant tank for the capacitive coupler. The fundamental harmonics approximation method is employed to analyse the system working principle. Considering the misalignment of coupler, the characteristic of output power is provided against the variation of coupler capacitance. A 1 kW CPT system with 150 mm transfer distance is set up to validate the proposed compensation circuit under various misalignment conditions. The experiment results show that the system can transfer 1009 W output power with 90.56% DC–DC efficiency at 150 mm transfer distance when the coupler is well aligned. When the misalignment is 325 mm, the variation of the output power is only 10.6% in X-direction and 15.2% in Y-direction. The proposed system can achieve high anti-misalignment performance.

Inspec keywords: compensation; inductive power transmission

Other keywords: output power; CPT system; misalignment conditions; fundamental harmonics approximation method; power 1009.0 W; CLC circuit; size 325.0 mm; compensation circuit; size 150.0 mm; power 1.0 kW; LC–CLC compensation topology; high-power; coupler misalignment performance; coupler capacitance; system working principle; LC circuit; high anti-misalignment performance; capacitive coupler; long-distance capacitive power transfer system; transfer distance

Subjects: Power convertors and power supplies to apparatus; Wireless power transmission

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