Regional Coupling Enhanced Self-Decoupling Omnidirectional Wireless Power Transfer Transmitter With Optimal Efficiency Strategy

Omnidirectional wireless power transfer (OWPT) systems are widely used in consumer electronics products (CEPs), industrial robots, unmanned detection equipment, etc. However, nondirectional electromagnetic energy transfer reduces system transmission efficiency and increases magnetic field leakage in the free working space. Besides, existing control strategies find it difficult to simultaneously ensure system simplicity and efficiency, thereby increasing system development and operating costs. In this article, a novel transmitter structure with high efficiency and low-leakage flux has first proposed, consisting of three square coils placed in an orthogonal position. Moreover, a self-decoupling reconfiguration method can further stimulate the potential of the transmitter, and the space electromagnetic field can be homogenized by the proposed optimal efficiency strategy. An OWPT platform with 100 V/100 kHz is built to prove the effectiveness of our designed transmitter structure. The experiment results show that the system efficiency remains 75.06%-77.17% within a 90 degrees rotation range, with the fluctuation rate reduced to a maximum of 7.81%. The efficiency in the planar range is increased to 86.8%, with a fluctuation rate of only 4.1%.