Patent ID: 9203380
Filing Date: 2015-12-01
Classification: H02J,H03J

Abstract:
1. A method suitable for wireless power transfer between a wireless power transfer device coupled to an alternating current (AC) power source, and a wireless power receiver device, each device including a series resonator with a resonator capacitor in series with a resonator power transfer coil that establish a self-resonant frequency, the wireless power transfer device including a series resonator in which the resonator capacitor is an adjustable tuning capacitor with an adjustable tuning capacitance C_A, comprising: establishing an initial self-resonant frequency fA for the power transfer device based on an initial capacitance value C_A for the adjustable tuning capacitor; coupling the power transfer device and the power receiver device; iteratively adjusting self-resonant frequency fA for the power transfer device by iteratively adjusting capacitance C_A for the tuning capacitor based on iteratively estimating a self-resonant frequency fB of the power receiver device by: if (fA−fB_est) is not different than the threshold, then transferring power between Dower transfer device and the power receiver device.