This article presents a maximum efficiency tracking method for an inductive power-transfer (IPT) system based on a Boost dc–dc converter. Impedance matching (IM) is achieved by maintaining the equivalent load impedance to be constant against load variations. The expression of the optimal equivalent load impedance corresponding to the maximum system-transfer efficiency is derived, and the impedance-transfer characteristics of the Boost converter in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) are analyzed. The duty cycle of the Boost converter is controlled to maintain the optimal equivalent load with extended range in DCM mode, and the switching frequency of the Boost converter is further adjusted to improve the accuracy of the IM. Both simulation and experimental results have demonstrated that the proposed IM method can help achieve the maximum power-transfer efficiency under a wide range of load variations.

中文翻译：

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通过基于升压转换器的阻抗匹配获得感应电力传输系统的最大效率

本文介绍了一种基于升压 dc-dc 转换器的感应功率传输 (IPT) 系统的最大效率跟踪方法。阻抗匹配 (IM) 是通过保持等效负载阻抗在负载变化时保持恒定来实现的。推导出最大系统传输效率对应的最优等效负载阻抗表达式，分析了Boost转换器在连续导通模式(CCM)和非连续导通模式(DCM)下的阻抗-传输特性。控制 Boost 转换器的占空比以在 DCM 模式下保持最佳等效负载和扩展范围，并进一步调整 Boost 转换器的开关频率以提高 IM 的精度。