Patent ID: 9419469
Filing Date: 2016-08-16
CPC Classification: H02J

Claim Text:
1. A control method for a high efficiency wireless charging system, comprising the steps of: keeping a resonant frequency point of a wireless charging system in an operating frequency range of the wireless charging system by performing impedance matching on an antenna of the wireless charging system; tracing an optimal frequency point by sending a sensing signal with a default transmission frequency, and calculating a transmission efficiency of the sensing signal; determining whether the transmission efficiency meets a transmission requirement; when the transmission efficiency does not meet the transmission requirement, repeats the previous steps with another default transmission frequency until the transmission efficiency meeting the transmission requirement; when the transmission efficiency meeting the transmission requirement, the default transmission frequency is defined as the optimal frequency point; setting the optimal frequency point as an operating frequency of the wireless charging system for charging; wherein the step of tracing the optimal frequency point is to determine whether the transmission efficiency meets the transmission requirement comprises steps of: determining whether a ratio of an efficiency variation to a frequency variation of the sensing signal is less than or equal to 0, when the ratio of the efficiency variation to the frequency variation of the sensing signal is greater than 0, the sensing signal is resent with the default transmission frequency by increasing a frequency value, and then recalculates the transmission efficiency of the sensing signal; when the ratio of the efficiency variation to the frequency variation of the sensing signal is less than or equal to 0, the default transmission frequency is defined as the optimal frequency point.