Microsoft Corporation
Adaptive wireless charging receiver loading

Abstract:

A charging receiver device adapts wireless charging receiver loading. The charging receiver device receives energy wirelessly transferred from a wireless charging coil of a charging transmitter device. The charging receiver device includes a charger circuit electrically coupled to a wireless charging receiver coil to receive the charging power. The charging power is a function of a rectified receiver voltage at the charger circuit. A received power monitoring circuit monitors the rectified receiver voltage at the charger circuit, detects a deviation of the monitored rectified receiver voltage from a target rectified receiver voltage for the charging receiver device, and decreases a charge current output from the charger circuit to increase the rectified receiver voltage toward the target rectified receiver voltage, responsive to determining that the detected deviation indicates that the monitored rectified receiver voltage is less than the target rectified receiver voltage.