Design of a Half-Bridge Converter for Self-Adapting Capacitive Wireless Power Transfer

N. Seliger
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引用次数: 2

Abstract

We present the design of a half-bridge converter for a capacitively coupled wireless power transfer system. The load signal acts as a positive feedback signal for a self-oscillation circuit which generates the driving gate signals for the converter. Our research reveals a robust wireless operation for a large range of load resistors and coupling capacitors. Based on an electric network analysis we obtain design criteria for self-oscillation and for the power transfer. The theoretical predictions are confirmed by circuit simulation and measurement results on a converter prototype with GaN-HEMTs. We report on a transfer efficiency of 92% for a power greater than 50W at a switching frequency of 300kHz and 200V DC link voltage.
自适应电容式无线电力传输半桥变换器的设计
提出了一种用于电容耦合无线电力传输系统的半桥变换器的设计。负载信号作为自振荡电路的正反馈信号,自振荡电路为变换器产生驱动门信号。我们的研究揭示了一个强大的无线操作的大范围负载电阻和耦合电容器。通过对电网的分析,得到了自振荡和功率传输的设计准则。电路仿真和gan - hemt变换器样机的测量结果证实了理论预测。我们报告了在300kHz开关频率和200V直流链路电压下,功率大于50W的传输效率为92%。
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