Dual-band wireless power transfer (WPT) system can provide two channels with different frequencies for power transfer and signal transmission. According to the impedance-frequency characteristic of the single-band WPT coil, a design method of dual-band WPT coil was proposed. The dual-band WPT system via magnetic resonant coupling (MRC) was designed, and the notch circuit was used to separate signal wave and power wave at receiving side. Partial element equivalent circuits (PEECs) were built for the dual-band system. Afterward, impedance characteristic of the dual-band coil, power transfer capacity and system efficiency were calculated. It is shown that the system can synchronously transfer signal without affecting the power transmission efficiency. The well consistency between experimental results and the theoretical analysis shows the effectiveness of the design method.%双频段无线电能传输系统可以提供两个不同频率的传输通道以实现电能和信号的同步传输.根据单一谐振频率的电能传输线圈的阻抗特性提出了双频段无线电能传输线圈的设计思路,并设计了双频段磁耦合谐振式无线电能传输系统,系统接收端采用陷波电路分离信号和电能.构建部分元等效电路对线圈阻抗特性、系统电能传输能力和传输效率进行计算,由此得出系统可同步传输信号并且不影响其电能传输效率.最后,设计了和理论计算系统参数一致的实验装置进行实验验证,结果与理论分析具有较好的一致性,验证了设计方法的有效性.
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