Dual‐frequency three‐dimensional wireless power transfer system to achieve two‐channel independent maximum power transfer

Abstract

This paper proposes a dual‐frequency three‐dimensional wireless power transfer system, which can achieve dual channel independent maximum power transfer of two movable receivers. Based on the dual‐frequency compensation network, a dual‐frequency magnetic field orientation strategy and a current control strategy are developed. Accordingly, the mathematical model of the proposed system is established, providing the theoretical support for mutual non‐interference of the power transfer between the two power transfer channels with different frequencies. On this basis, an iterative optimization control system is designed for independent maximum power transfer for two power transfer channels without any interference. A 200‐W experimental prototype with an efficiency of around 80% is built to verify the correctness of the proposed system. In the case of load position change, the response time of the proposed system is around 200 ms.