Adaptive Magnetic Resonance Wireless Power Transfer System with Optimum frequency and Power-Leve Tracking for maintaining highly efficient

To supply the optimum amount of required power to a load device even when the environmental situations including variation of transfer distance, automated adaptive frequency with power-level tracking systems are proposed based on direct monitoring of the power transfer efficiency (PTE) with received power-level and minimum reflection level observed in the transmitter output via bidirectional out-of-band signalling for efficient and stable mid-range magnetic resonance wireless power transfer (WPT) operations. The effectiveness of the proposed schemes has been successfully demonstrated using a normal digital LED TV, as one of representative exemplary cases. Thus, it is anticipated that the proposed solutions can be commonly useful for any WPT application including mobile devices, electric vehicles, biomedical devices, and many more.