Semtech Corporation
SINGLE SWITCH MODULATION CIRCUIT AND WIRELESS CHARGING RECEIVER

Abstract:

A wireless charging receiver that provides power delivered from a transmitter over an wireless path. The receiver includes a rectifier circuit, an LC circuit coupled to the rectifier circuit and the transmitter, a single switch modulation circuit coupled to the rectifier circuit and the LC circuit, an output circuit coupled to the rectifier circuit. The receiver further comprises an in-band controller coupled to the LC circuit and the single switch modulation circuit operational to detect a reflected parameter from incident RF power. A resistance value of the single switch modulation circuit can be set in response to a detected parametric value of the LC circuit. The resistance value can be set to cause the rectifier circuit to generate one of a stable RDCV value, an increased RDCV value, and a decreased RDCV value with respect to a normal PDC value in response to the received RF power.