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| Research on Constant Current and Constant Voltage of WPT System Based on Variable Frequency Reconfiguration S/SP Topology |
| Li Zhongqi1,2, Zhang Chenxi1, Wang Jianbin1, Wang Zhongmei1, Huang Shoudao2 |
1. College of Railway Transportation Hunan University of Technology Zhuzhou 412007 China;
2. College of Electrical and Information Engineering Hunan University Changsha 410082 China |
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Abstract Wireless power transfer (WPT) technology achieves contactless power transfer through the media, such as electromagnetic fields, which provides a new, feasible way to solve safety and convenience problems in traditional contact charging. In the wireless charging of electric vehicles, the WPT system must have a constant current and constant voltage output and reduce output current and voltage fluctuations to prolong the service life of the battery. However, in practice, the output of the WPT system is affected by the coupling coefficient between the coils and the load variation. This paper proposes a WPT system comprising a staggered stacked coil structure and variable frequency reconfiguration S/SP compensation. The system's anti-offset performance is improved by optimizing the coil structure, and fluctuations in constant current and constant voltage outputs are suppressed by reconfiguring the compensation topology and switching the operating frequency.
Firstly, a variable frequency reconfiguration control strategy combined with topology reconfiguration and frequency switching is proposed. The characteristics of constant current output, constant voltage output, and zero phase angle of the variable frequency reconfiguration S/SP compensation system are analyzed. The size of the compensation capacitors in the constant current and constant voltage operating modes is compared, and a method for system parameter adjustment is given, which effectively solves the problems of complex system design and wide frequency switching range. Secondly, the magnetic field superposition theorem is applied to analyze coils. An isotropic series compensation coil is introduced at the edges of the rectangular coil to compensate for the coupling coefficient at the edges of the main coil, which forms an SSC structure with good anti-offset properties. Finally, a 500 W experimental prototype was built to verify the anti-offset performance.
The experimental results show that the fluctuation rate of the coupling coefficient of the staggered stacked coil is less than 5% when the X-axis direction is offset by 55% (187 mm) of the outer diameter of the transmitting coil or the Y-axis direction is offset by 120 mm. The error between the simulation and experiment is not greater than 5%, and the error between the theoretical value and experiment does not exceed 5%. The output current of the system in constant current mode is 6.3 A with a current fluctuation rate of 3.58%, and the output voltage in constant voltage mode is 74 V with a voltage fluctuation rate of 4.83%, which meets the constant current and voltage requirements of the wireless charging system. In future research, switching between the two operating modes of constant current and constant voltage will be considered to achieve automatic switching.
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Received: 18 December 2023
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2024, Vol. 39 
