Basic Study on Transmission Side Impedance Matching in MRC-WPT

In a wireless power transfer circuit, the input impedance fluctuates due to variations in the transfer distance between the transmitter and receiver coils. Input impedance fluctuations are problematic because they can cause the desired voltage value of the power supply or the current flowing through the circuit to be excessive. Therefore, this study examines the introduction of a CLC-type impedance matching circuit on the transmission side to suppress input impedance fluctuations, even when the transfer distance varies. The simulation results demonstrate that the input impedance can be kept constant and the power supply distance can simultaneously be extended. This research will contribute to the improvement of wireless power transfer technology used in unmanned vehicles and electric vehicles.