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Analysis of triple phase shift strategy in wireless power transfer systems considering asymmetric parameters and harmonics for enhanced energy efficiency

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  • Wang, Xiaosheng
  • Jiang, C.Q.
  • Wang, Yibo
  • Chen, Chen
  • Zhou, Jiayu
  • Luo, Bo

Abstract

Wireless power transfer (WPT) systems with dual-side control can achieve bidirectional energy flow and impedance matching, as well as less conduction loss in rectifying. These systems typically employ a triple phase shift (TPS) control strategy to track the maximum system efficiency point, regulate output power, and achieve zero voltage switching (ZVS) for energy conversion. However, the traditional TPS strategy barely achieves optimal efficiency in the strong coupling case, as it is derived based on the fundamental harmonic analysis method. Additionally, the optimal solution in the existing literature is not general enough for weak coupling due to the asymmetric voltage and parasitic resistance on both sides. This paper presents the modified analytical solution of the TPS strategy for the weak coupling case. For the strong coupling case, it is found that the influence of 2nd and 3rd harmonics on the output power and system efficiency is quite significant. Finally, simulation and experiments based on a 1.3 kW prototype are conducted to verify the theoretical analysis.

Suggested Citation

  • Wang, Xiaosheng & Jiang, C.Q. & Wang, Yibo & Chen, Chen & Zhou, Jiayu & Luo, Bo, 2025. "Analysis of triple phase shift strategy in wireless power transfer systems considering asymmetric parameters and harmonics for enhanced energy efficiency," Energy, Elsevier, vol. 333(C).
    • Handle: RePEc:eee:energy:v:333:y:2025:i:c:s0360544225031378
    DOI: 10.1016/j.energy.2025.137495
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