Method and Apparatus for Wirelessly Charging Portable Electronic Devices

摘要

Wireless charging of portable electronic devices is carried out by detecting load variations caused by the device and dynamically compensating for these variations during charging to increase system efficiency and regulate delivered power. In some embodiments, load variations are tracked by comparing a feedback signal to a value range and determining whether the feedback value is higher than, lower than, or within the range of values. This information is then used to modify one or more parameters associated with a power amplifier in a transmitter device.

主权项

1. An electronic device comprising:
a power amplifier circuit for use in wirelessly charging an external portable device, the power amplifier having a switching transistor and a resonant circuit, the resonant circuit having at least one variable capacitance and at least one variable inductance, the variable inductance being positioned for magnetic coupling to an inductance within the external portable device, the external portable device creating a time varying load within the electronic device during charging operations; and a load variation detection and compensation circuit to identify load variation within the power amplifier circuit based on feedback from the power amplifier circuit and to generate control signals to adjust the at least one variable capacitance and the at least one variable inductance of the resonant circuit to compensate for variations in load, wherein the load variation detection and compensation circuit operates continually during charging operations to compensate for time varying load.