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<p>Wireless power transfer (WPT) is considered to be an advantageous solution for charging lithium batteries due to its safety and convenience. Due to the limitations of WPT system topologies, the output usually presents a constant current (CC) or constant voltage (CV) mode. However, the inherent load-dependent power fluctuations in conventional WPT topologies implementing CC or CV output can result in suboptimal charging profiles, such as reduced average charging power or prolonged charging time, leading to economic inefficiencies. The charging current and voltage can be more accurately controlled by the constant power (CP) charging mode, which can largely maintain the stability of the charging state, shorten the charging time, and improve the energy efficiency. In this paper, a PPS-S topology with adjustable output power is designed, and a quasi-constant-power-constant-voltage QCP-CV) charging strategy is proposed. The feasibility of this strategy is validated through simulations and experiments. The QCP-CV charging strategy meets zero-voltage-switching (ZVS) requirements and stabilizes output power at around 65&#xa0;W. Compared with the CC–CV charging strategy under the same load change, the power fluctuation is reduced by 80%.</p>

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Quasi-constant power wireless charging strategy based on power adjustable PPS-S topology

  • 期刊论文

  • 发表日期：

    2025年8月27日

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  • Kairui Li,
  • Wei Wang,
  • Zheng Lu,
  • Siyuan Sheng,
  • Jingyu Yang

摘要

Wireless power transfer (WPT) is considered to be an advantageous solution for charging lithium batteries due to its safety and convenience. Due to the limitations of WPT system topologies, the output usually presents a constant current (CC) or constant voltage (CV) mode. However, the inherent load-dependent power fluctuations in conventional WPT topologies implementing CC or CV output can result in suboptimal charging profiles, such as reduced average charging power or prolonged charging time, leading to economic inefficiencies. The charging current and voltage can be more accurately controlled by the constant power (CP) charging mode, which can largely maintain the stability of the charging state, shorten the charging time, and improve the energy efficiency. In this paper, a PPS-S topology with adjustable output power is designed, and a quasi-constant-power-constant-voltage QCP-CV) charging strategy is proposed. The feasibility of this strategy is validated through simulations and experiments. The QCP-CV charging strategy meets zero-voltage-switching (ZVS) requirements and stabilizes output power at around 65 W. Compared with the CC–CV charging strategy under the same load change, the power fluctuation is reduced by 80%.