自限幅电路建模及在无线电能传输中的应用

在一些无线电能传输(WPT)技术的应用场合，对供电的可靠性与能量接收端的体积有严苛要求。回顾了用于LLC谐振变换器的自限幅电路，提出了基于基波法、通用于这些自限幅电路的非线性电容-非线性电阻等效电路模型。利用自限幅电路构建了本质安全且有利于减小接收端体积的WPT变换器拓扑。基于所提模型的计算结果表明，该拓扑具有本质安全性，并估算了自限幅电路工作后其电压增益变化规律。仿真与实验也验证了该拓扑是本质安全的，且提高了WPT装置的偏移容忍度，所提模型可用于估算其电压增益等指标。

Modeling of self-amplitude-limitation circuit and its application in wireless power transfer

In some application areas of wireless power transfer(WPT) technology, there are strict requirements on the reliability of power supply and the volume of energy receiver. The self-amplitude-limitation circuits for LLC resonant converter are reviewed, and based on the fundamental harmonic analysis, a nonli-near capacitor-nonlinear resistor equivalent model common to these self-amplitude-limitation circuits is proposed. An intrinsically safe WPT converter topology is constructed based on the self-amplitude-limitation circuit, which is beneficial to reduce the volume of the receiver. The numerical calculation results based on the proposed model show that this topology is intrinsically safe, and the variation law of voltage gain after the self-amplitude-limitation circuit operates is estimated. Simulation and experiment also verify that the topology is intrinsically safe, and the misalignment tolerance of the WPT device is improved, performance indexes such as the voltage gain of the converter can be estimated by the proposed model.