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| Hybrid Self-Switching Resonant Wireless Charging System Based on LCL-LCL/S |
| Guo Xing1, Liu Liqiang1, Qi Yongsheng1, Gao Xuejin2, Li Yongting1 |
1. College of Electric Power Inner Mongolia University of Technology Hohhot 010080 China;
2. Department of Information School of Automation Beijing University of Technology Beijing 100124 China |
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Abstract This paper aims to reduce the number of switching devices and passive components in a hybrid topology charging system, improve the output power of the system, and simplify the control strategy of the primary and secondary sides. A hybrid self-switching resonant wireless charging system based on LCL-LCL/S is proposed, which does not need primary and secondary side communication or any passive components. The constant current and constant voltage switching of the wireless charging system is realized only by changing the network topology through the automatic switching operation of the LCL structure. Firstly, a relationship between constant current or constant voltage output and input impedance was analyzed by a T-type network. Then, a mathematical model of the hybrid compensation network was introduced to analyze the parameter configuration conditions for realizing the zero-phase angle (ZPA) between the input current and voltage of the system and the constant current or constant voltage output characteristics. Next, according to the characteristics of the battery charging curve, resonant current threshold, voltage jump threshold, and coupling coefficient change constraints, a design method suitable for hybrid resonant topology network parameter optimization was proposed. This solution not only avoids the problem of parameter uncertainty caused by the limitation of empirical selection of resonant network parameters, but also provides a theoretical basis for parameter selection. Finally, an experimental platform was built to verify the feasibility and effectiveness of the solution. The experimental results show that the wireless charging system with optimized resonant network parameters possesses good constant current and constant voltage output characteristics. The maximum transmission efficiency of the system is 81%, which fully meets the requirements of constant current and constant voltage wireless charging.
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Received: 27 April 2021
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2022, Vol. 37 
