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In response to the problems of detuning, decreased transmission efficiency, and unstable output voltage caused by parameter changes in Magnetic Coupled Resonant Wireless Power Transmission systems, this paper analyzes the system characteristics under resonance and detuning states based on the S-S type MCR-WPT mathematical model. A frequency tracking and constant voltage output control strategy is adopted, and the transmitting end achieves real-time locking of the resonant frequency through orthogonal decomposition and quadrature axis voltage error feedback using a Second Order Generalized Integrated Phase Locked Loop; The receiving end dynamically adjusts the duty cycle through a Buck circuit combined with a PI controlled constant voltage output strategy to maintain stable output voltage. The MATLAB/Simulink simulation results show that the frequency tracking control method used can restore the resonant state of the system and improve the transmission efficiency of the system to over 90% when the capacitance of the transmitting end changes by ± 20nF and the self-inductance of the transmitting end coil changes by ± 8 μH; Constant voltage control can adjust the output voltage to the set value of 12 V and maintain stability when the load fluctuates(10 Ω to 5 Ω to 8 Ω).

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Research on WPT System Using SOGI-PLL Frequency Tracking and Buck Constant Voltage Output

  • 会议论文

  • 发表日期：

    2026年

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  • Xiaobo Wan,
  • Guokang Zhou,
  • Shihong Xie,
  • Rongshu Li

摘要

In response to the problems of detuning, decreased transmission efficiency, and unstable output voltage caused by parameter changes in Magnetic Coupled Resonant Wireless Power Transmission systems, this paper analyzes the system characteristics under resonance and detuning states based on the S-S type MCR-WPT mathematical model. A frequency tracking and constant voltage output control strategy is adopted, and the transmitting end achieves real-time locking of the resonant frequency through orthogonal decomposition and quadrature axis voltage error feedback using a Second Order Generalized Integrated Phase Locked Loop; The receiving end dynamically adjusts the duty cycle through a Buck circuit combined with a PI controlled constant voltage output strategy to maintain stable output voltage. The MATLAB/Simulink simulation results show that the frequency tracking control method used can restore the resonant state of the system and improve the transmission efficiency of the system to over 90% when the capacitance of the transmitting end changes by ± 20nF and the self-inductance of the transmitting end coil changes by ± 8 μH; Constant voltage control can adjust the output voltage to the set value of 12 V and maintain stability when the load fluctuates(10 Ω to 5 Ω to 8 Ω).