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<p>Wireless power transfer (WPT) systems are loosely coupled systems with multiple parameters that vary drastically and randomly, making it challenging to operate in constant current (CC) and constant voltage (CV) mode across a wide range of parameters. This paper presents an autonomous WPT system based on parallel–parallel (PP) topology, which can achieve CV output despite large variations in load and coupling coefficient. Additionally, it can be configured as a WPT charger for lithium batteries, featuring an automatic transition from CC to CV mode. The system presented in this paper eliminates the need for digital controllers, DC–DC converters, and wireless communication links, resulting in reduced cost and improved efficiency and robustness. To validate the theoretical analysis, a 150-W experimental prototype is constructed. The experimental results demonstrate that when the coupling coefficient and load change simultaneously, the fluctuation in output voltage is maintained within a narrow range. Furthermore, a specific WPT charger prototype is designed, achieving a peak overall efficiency of 90.0%.</p>

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Discovering autonomous CC-to-CV transition characteristics of wireless charging system using frequency tracking for large coupling and load variation tolerance

  • 期刊论文

  • 发表日期：

    2026年4月10日

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  • Ruozhong Gao,
  • Xin Dai,
  • Lei Zhao,
  • Shunsheng Hong,
  • Jinde Wu,
  • Yanling Li

摘要

Wireless power transfer (WPT) systems are loosely coupled systems with multiple parameters that vary drastically and randomly, making it challenging to operate in constant current (CC) and constant voltage (CV) mode across a wide range of parameters. This paper presents an autonomous WPT system based on parallel–parallel (PP) topology, which can achieve CV output despite large variations in load and coupling coefficient. Additionally, it can be configured as a WPT charger for lithium batteries, featuring an automatic transition from CC to CV mode. The system presented in this paper eliminates the need for digital controllers, DC–DC converters, and wireless communication links, resulting in reduced cost and improved efficiency and robustness. To validate the theoretical analysis, a 150-W experimental prototype is constructed. The experimental results demonstrate that when the coupling coefficient and load change simultaneously, the fluctuation in output voltage is maintained within a narrow range. Furthermore, a specific WPT charger prototype is designed, achieving a peak overall efficiency of 90.0%.