FAST METHOD FOR IDENTIFYING COIL MISALIGNMENT/MUTUALCOUPLING IN WIRELESS CHARGING SYSTEMS

摘要

Methods and apparatus for determining the misalignment and mutual coupling between the transmitter coil and receiver coil, with or without an intermediate relay resonator coil, of a wireless power charging system are provided. The determination can be made without using any direct measurement from the receiver circuit. The technic involves exciting the transmitter coil of the wireless power charging system at several frequencies with equal or different input voltage/current, such that the number of equivalent circuit equations is at least equal to the number of unknown terms in the equations. The methods use the knowledge of only the input voltage and the input current of the transmitter coil. This means that the mutual inductance or magnetic coupling coefficient between the transmitter and receiver coils can be determined based on the information obtained from the transmitter circuit and there is no need for any wireless communication from or direct measurements of the receiver circuit.