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| A Dynamic Tuning Method with an Auxiliary Coil for Wireless Power Transfer System Considering the Influence of Higher Harmonics |
| Xie Shiyun1, Huang Jie1, Peng Chunyao1, Liu Ruijie1, Chen Long2 |
1. School of Electrical and Electronic Engineering Chongqing University of Technology Chongqing 400054 China;
2. College of Applied Science and Technology Chongqing University of Technology Chongqing 400054 China |
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Abstract Inductive coupling wireless power transfer (IPT) technology features flexibility, safety, and convenience. IPT systems can meet the demand for power in harsh environments, solving problems such as mechanical wear and tear, dust accumulation, and poor contact.
In practical applications, the deviation of the receiving structure of the IPT system causes variation in the self-inductance and mutual-inductance parameters of the transmitting and receiving coils, resulting in the system operating at an untuned state and increasing the ratio of the higher harmonics in the output current of the inverter. Considering the effects of the higher harmonics, a dynamic tuning method for the IPT system is proposed, constructing an integrated system with LCC-S as the power transfer channel and the auxiliary coil as the tuning channel. By controlling the input voltage amplitude of the tuning channel, the system can remain in a resonant state. At the same time, impedance matching to the load ensures that the percentage of the higher harmonics is not higher than the required value. The dynamic tuning method enables step less-continuous tuning for the power transfer channel without reconstruction of the power transfer channel, and the process does not affect the pickup power.
The system's fundamental tuning and power transfer channel model is developed. The interaction between the two channels is analyzed. Accordingly, the voltage expression for the resonant state of the power transfer channel is provided to drive the tuning channel. A relationship is established between the input voltage of the tuning channel and the input impedance characteristics of the power transfer channel. The power distribution mechanism of the two energy channels is revealed when the auxiliary coil and the energy-transmitting coil operate simultaneously. The input current of the power transfer channel is derived analytically when considering the effect of the 3rd and 5th current harmonics. Based on that, the influence of the 3rd and 5th harmonics on the imaginary part of the input current is investigated. The equivalent load resistance corresponds to the higher harmonic suppression ratio of the energy transmission channel. A control method for the input voltage of the tuning channel is provided to meet the resonance conditions of the energy transmission channel while achieving higher harmonic suppression. Finally, a dynamic tuning control procedure is developed for the energy transmission channel using the control method.
A transmitting structure with a flat hollow coil serving as the tuning channel and a DD coil as the power transfer channel was designed to verify the proposed dynamic tuning method. An experimental platform with a 120 mm distance of 500 W was built. Envelope and temporary waveforms were measured when the impedance matching circuit and the auxiliary coil of the tuning channel were operating. Simulation and experimental results show that the phase difference of the inverter output of the prototype is always below 8° at ±30% X-axis and ±50% Y-axis offsets, and the fundamental component is more than ten times the higher harmonic component.
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Received: 30 July 2024
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| Fund:国家自然科学基金项目（52207004）、重庆市自然科学基金项目（cstc2021jcyj-msxm0406）和重庆市基础研究项目（KJQN202101128）资助 |
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Corresponding Authors:
陈 龙 男,1989年生,博士,讲师,研究方向为电力电子与电能变换、无线电能传输。E-mail: chenlong118@cqut.edu.cn
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2025, Vol. 40 
