US Patent 9698632 Wireless battery charger and charge-receiving device

A wireless charger includes a plurality of conductive coils and electronic circuitry. The coils are disposed around a perimeter and face a generally central area of the perimeter. The coils are connected to and controlled by the electronic circuitry, which includes an electric power receiving circuit and a coil controller. The electric power receiving circuit receives electrical power from an external source and conditions the power for provision to the coil controller. The coil controller controls provision of an oscillating current to select coils within the plurality of coils. A protective enclosure or portable electronic device may have receiving coils disposed at its sides for corresponding to at least two of the conductive coils of the wireless charger.