Abstract: A method, a portable electronic device and a wireless charging system enables a load to be charged by selectively using a detection circuit configuration and a power receiving circuit configuration. A controller is coupled within a wireless power receiver (i) to a sensing circuit having a multi-tapped coil and (ii) to a rectifier that is coupled to the sensing circuit and removably coupled to a load. The controller detects, at an output of the rectifier, a first signal corresponding to an externally transmitted signal that is magnetically coupled to the multi-tapped coil while the sensing circuit is in the detection circuit configuration. In response to detecting the first signal, the controller switches from the detection circuit configuration to the power receiving circuit configuration. The controller then connects the load to the output of the rectifier in order to deliver power to the load.

Abstract: A method, a portable electronic device and a wireless charging system enables a load to be charged by selectively using a detection circuit configuration and a power receiving circuit configuration. A controller is coupled within a wireless power receiver (i) to a sensing circuit having a multi-tapped coil and (ii) to a rectifier that is coupled to the sensing circuit and removably coupled to a load. The controller detects, at an output of the rectifier, a first signal corresponding to an externally transmitted signal that is magnetically coupled to the multi-tapped coil while the sensing circuit is in the detection circuit configuration. In response to detecting the first signal, the controller switches from the detection circuit configuration to the power receiving circuit configuration. The controller then connects the load to the output of the rectifier in order to deliver power to the load.