| Summary: | In order to solve the problem of low efficiency and transmission distance of multi-to-1(multi transmit(TX) coils to one receive(RX) coil)coupled magnetic resonance(CMR) wireless power transmission system, this paper presents 2-to-1(two TX Coils to one RX coil) of the CMR wireless energy transmission system of the adaptive impedance matching method. The principle of this method is that when the load impedance is matched to the equivalent internal impedance of the power source, power can be transmitted to the load without reflection, but it is usually not matched. Therefore, the LC impedance matching network(IMN) is used to make the source resistance and the load side impedance equal. As the RX coil changes in the spatial position of the transmitter will cause the input impedance changes, this paper sets different LC impedance matching network for different RX coil position, so that it can achieve the purpose of adaptive impedance matching. Finally, after the test, with the RX coil in the spatial position of the change, the impedance matching network can quickly achieve automatic matching, energy transfer efficiency is up to 87%, and the mobile phone charging distance increases to 10 cm or more.
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