| Wireless power transfer(WPT)technology has the advantages of convenience and security compared with traditional power transmission methods,and has become one of the hot research directions of scholars both here and abroad.However,the coil misalignment problem is a key issue that needs to be solved before the WPT technology becomes practical.When the position of the receiver coil relative to the transmitter coil is misalignment,the mutual inductance between the coils will be reduced,and the impedance of the system will be mismatched.As a result,the transmission efficiency of the system will drastically decrease.Therefore,in order to improve the tolerance of WPT system to coil misalignment,it is necessary to optimize the coil structure design,and it is of great significance to achieve good impedance matching to improve the system transmission performance.In this paper,a multi-emission switching coupling mechanism is designed firstly.The transmitting end of the mechanism consists of 13 small hexagonal hexagons,which can form three power supply areas with different positions.Each power supply area consists of six small hexagonal hexagons.Based on the analysis of the working mechanism of the coupling mechanism,a coil switching control method based on the compensating capacitor voltage of the transmitting end is proposed,which can realize the adaptive switching of different power supply areas and improve the tolerance of the WPT system to coil offset.Based on BPF theory,a CLC impedance matching network is proposed to improve the system transmission performance.Finally,the effectiveness of the control strategy and impedance matching network for multi-emission switching WPT system is verified by electromagnetic simulation and prototype experiments.The main work of this article is as follows:(1)Aiming at the optimization of the coil structure,a multi-emission switching coupling mechanism is proposed.The switching logic of the power supply area of the transmitting coil is analyzed.The equivalent model of the coupling mechanism is established.The influence mechanism of the coil offset on the coupling coefficient is studied.(2)The intrinsic relationship between the compensation capacitor voltage and the offset degree of the coil at the transmitter is discussed.A coil switching control method based on the compensation capacitor voltage at the transmitter is proposed to realize adaptive switching of different power supply regions of the transmitter coil.(3)Based on the BPF theory,the WPT system model is established and the matching conditions of the optimal load of the system are deduced.Based on this,a CLC impedance matching network is constructed to solve the problem of system impedance mismatch caused by switching the transmitting coils. |
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