Current research in selectively supplying power to multi-receiving coil by each means has advantages and disadvantages. In response, the authors designed a more efficient selective power transmission and power allocation method. Multiple different specifications coaxial decoupling coils as the receiving coils. And the transmitting coils of the same specification as the receiving coils are integrally arranged on the same axis. Since the cross-coupling between the receiver coils can be eliminated. Therefore, excite the transmit coil can selectively supply power to the same specification receiver coil. And the load power can be designed by the impedance inverter of the receiving coil.

This paper proposes a dual-receiver wireless power transfer system that uses bipolar coils as a transmitter and receivers. Compared with a traditional dual-receiver system with unipolar coils, the proposed system can effectively and conveniently eliminate cross-coupling between the receivers, and another significant feature of the system is the ease of changing the received power of the two receiver loads by changing the relative angle of the bipolar coils. The mutual inductance of the bipolar coils is modelled by Newman's formula. Then a system design method to eliminate the influence of cross-coupling and realize controllable power allocation is proposed.

An innovative extendible wireless power transfer system with load independent output voltage is developed in this paper. This system eliminates the interference caused by the cross coupling between nonadjacent coils and unrelated circuit networks among the receiving coils. The wireless power transfer system consists of a full-bridge converter power supply, transmitting resonator, relay resonators, and multiple receiving resonators. The theory of load independent output voltage is demonstrated in detail in this paper. The structure and features of the system has also been carefully illustrated. The simulation and experimental results show that the multiple receiving resonators do not affect each other when obtaining power and that the system can obtain load-independent output voltage. Experimental results and simulation analysis are highly consistent and the integrity of the theory is verified.