Magnetically coupled resonant multi-frequency and multi-load wireless power transfer system with load-isolation

A multi-load wireless charging platform based on the principle of magnetic coupling resonant wireless power transfer (MCR-WPT) is proposed in this paper. The platform can simultaneously supply power to multiple receivers with different operating frequencies and each load is independent of the others loads. The system consists of a multi-frequency composite current source, a planar transmitter coil, an LC source multi-frequency tuning network, and several receivers operating at different frequencies. The mutual interference caused by cross-coupling and frequency cross-talk when multiple receivers are charging at the same time was analyzed. A load-independent principle to overcome these interferences was provided in the paper. Finally, a dual-frequency multi-load wireless charging experimental platform was built and measured. The well consistency between the experimental results and the theoretical analysis shows the effectiveness of the design method.