High-Power Capacitive Power Transfer System With Integrated Multichannel Coupler

The demand for high-power wireless power transfer systems has been gradually increasing in recent years. In this article, a high-power capacitive power transfer (CPT) system with integrated multi-channel coupler (IMCC) is proposed, which first realizing an output power more than 10kW, and the IMCC offers the advantages of reduced compensation inductors, reduced cross-coupling effects, and extendable performance. Since there is a cross coupling between every two plates, the IMCC results in a circuit model of 15n+16C<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup><sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n</sub> coupling capacitors (<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n</i> represents the number of channels). The induced current source model and induced voltage source model are used to modeling the IMCC, and the effects of cross-coupling mutual capacitances on the system are analyzed. Compared to the four-plate multi-channel coupler, the IMCC can reduce the cross-coupling effects in both aligned and misaligned cases. A M-M compensated three-channel CPT prototype with the IMCC is built, achieving impressive output power of 10.35 kW and dc-dc efficiency of 94.2% with a 50mm airgap. Experimental results show that the proposed CPT system with the IMCC is suitable for high-power applications and can effectively minimize the cross-coupling effects.