Patent ID: 8120316

Claim:
A wireless charging system for charging a battery of an electronic device, the wireless charging system comprising: a receiving coil in the electronic device connected to the battery; a base; a plurality of transmitting coils formed within the base, each of the plurality of transmitting coils is for transmitting electromagnetic energy which is capable of inducing a current in the receiving coil for charging the battery; and a processor connected to the transmitting coils for selectively activating the transmitting coils one by one and detecting a load power value of each transmitting coil before charging, and activating the transmitting coil having the highest load power but inactivating the other transmitting coils when charging; wherein the base comprising an upper surface, a lower surface, a first sidewall, and a second sidewall parallel to the first sidewall; the upper surface defines a groove thereon; and the groove comprises an open-end and a bottom surface; wherein the transmitting coils are formed under the bottom surface of the base; the transmitting coils are arranged in a matrix manner; and each of the transmitting coils is assigned a positioning code for distinguishing each other; wherein further comprising a power circuit connected to the transmitting coils for providing electrical power to the transmitting coils; and wherein the processor comprises: a detecting unit configured for selectively connecting the transmitting coils to the power circuit one by one and detecting the load power value of each of the transmitting coils; a memory unit configured for storing the load power values and the corresponding positioning codes of the transmitting coils; a comparing unit configured for comparing the load power value of each of the transmitting coils to locate the transmitting coil having the highest load power value; and a selecting unit configured for connecting the transmitting coil having the highest load power value to the power circuit and disconnecting the other transmitting coils from the power circuit.