基于FFT解调的ECPT系统全双工通信技术研究

电场耦合无线电能传输(ECPT)技术以其耦合机构轻便、系统电磁辐射小以及周边金属涡流效应小等优点,成为无线电能传输领域的研究热点。在ECPT技术的应用过程中,有时不仅需要实现原副边的无线电能传输,还需要实现电能原副边的全双工无线信号传输。目前无线电能与信号并行传输系统中信号解调环节均采用模拟电路实现滤波与解调,该方法电路设计复杂、通用性能差、抗干扰能力不足。针对上述问题,本文提出一种基于FFT运算的频域解调方法。该方法将叠加于系统中的双向信号载波以及低频电能串扰信号映射至频域中,依靠其频域的分离特性,解决了低频电能串扰对信号解调的干扰问题,同时实现双向信号的实时解调。最后通过仿真与实验验证了该方法的正确性与有效性。

Research on full-duplex communication technology of ECPT system based on FFT demodulation method

Electric-field coupled power transfer technology has been a research focus recently because of its advan-tages such as reduced volume and weight of the coupling structure, and low EMI and eddy current effect on the sur-rounding metals. In the application process of ECPT technologies, besides transferring power from transmitter to re-ceiver wirelessly, wireless signal transfer is also necessary. At present, analog circuits are adopted to filter and de-modulate signals from the wireless power and signal parallel transmission system in general. But it is complex to de-sign these analog circuits in this method, moreover, the generality and anti-interference capability of this method are unsatisfactory. To solve these problems, a demodulation method in the frequency domain based on FFT calcula-tion has been proposed in this paper. In this method, the mixed signal which consists of carrier of bidirectional communication and low-frequency power crosstalk is mapped to the frequency domain. The problem of interference of power crosstalk on the signal transmission has been addressed and a full-duplex communication has been realized because of the separation characteristics of the mixed signal in the frequency domain. Finally, the correctness and effectiveness have been verified by the simulated and experimental results.