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An Inductive and Capacitive Combined Parallel Transmission of Power and Data for Wireless Power Transfer Systems

无线电能传输系统电感与电容感应电容组合​能量与信号并行传输

【作 者】李小飞,唐春森,戴欣,邓鹏奇,苏玉刚

【摘 要】

A new parallel transmission method of power and data is proposed for peer-to-peer wireless power transfer (WPT) systems. Essentially, data are modulated and transferred via highfrequency electric field generated by the parasitic capacitances of the coupling coils and the metal shield plates, while power is transferred through relatively low-frequency magnetic field generated by the coupling coils. Coupling structure and operation principle are illustrated and analyzed. Besides, the signal to noisy ratio performance is studied and optimized. With the proposed method, a 40 W prototype is built and the data transmission rate reaches 230 kbps. Experimental results have verified that the proposed method is valid and has the advantages of good flexibility and large spatial position offset redundancy. Because the method does not do any modification on the main circuit of the WPT system, it also has advantages of low cost and easy to implement.

【关键词】Data transfer, parasitic capacitances, wireless power transfer (WPT).

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