In wireless power receiver systems, the buck converter is widely used to step down the higher rectified voltage derived from the wireless receiver coil, to a lower output voltage for the immediate battery charging process. In this work, the presence and effect of the right-half-plane (RHP) zeros found in the small-signal inductor-current-to-duty-ratio and output-voltage-to-duty ratio transfer functions of the buck converter in the wireless power receiver system on the control performance, are investigated. It is found and mathematically proved that the RHP zeros are introduced by the current source nature of the system attributed to the series-series compensation and finite DC-link capacitance. The RHP zero not only results in non-monotonic open-loop dynamic response but also complicates the design of feedback control and causes potential closed-loop instability. Theoretical and experimental results are provided to validate the presence of the RHP zeros and their effect on open-loop and closed-loop dynamic responses.

中文翻译：

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无线电力接收器系统中具有输入电流源的降压转换器中右半平面零存在的影响

在无线电源接收器系统中，降压转换器广泛用于将来自无线接收器线圈的较高整流电压降压到较低的输出电压，以便立即为电池充电。在这项工作中，在降压转换器的小信号电感器电流占空比和输出电压占空比传递函数中发现的右半平面 (RHP) 零点的存在和影响对无线电力接收器系统的控制性能进行了研究。已经发现并在数学上证明了 RHP 零点是由系统的电流源性质引入的，这归因于串联-串联补偿和有限的直流链路电容。RHP 零不仅导致非单调的开环动态响应，而且使反馈控制的设计复杂化并导致潜在的闭环不稳定。提供了理论和实验结果来验证 RHP 零点的存在及其对开环和闭环动态响应的影响。