RESONANT WIRELESS POWER RECEIVER CIRCUIT AND CONTROL CIRCUIT AND WIRELESS POWER CONVERSION METHOD THEREOF

摘要

The present invention provides a resonant wireless power receiver circuit, including: a resonant circuit for receiving a wireless power to generate an AC resonant signal; a switch controlled rectifier circuit which includes a multi-mode switch circuit, for rectifying the AC resonant signal into a rectifier output signal to drive a load, wherein the multi-mode switch circuit includes at least one multi-mode switch; and a feedback control circuit for generating a switch control signal according to a feedback signal related to the rectifier output signal to control the at least one multi-mode switch such that it operates at least in a Resonance Short Circuit Operation to limit the rectifier output signal or to regulate the rectifier output signal. In the Resonance Short Circuit Operation, a positive resonant output node and a negative resonant output node are short-circuited by the multi-mode switch circuit.

主权项

1. A resonant wireless power receiver circuit, comprising:
a resonant circuit which includes a receiver coil, configured to operably receive a wireless power to generate an AC resonant signal between a positive resonant output node and a negative resonant output node, wherein the AC resonant signal includes an AC resonant voltage, and the AC resonant voltage has an amplitude; a switch controlled rectifier circuit, configured to operably convert the AC resonant signal to generate a rectified output signal between a rectified output node and a ground node, wherein the rectified output signal includes a rectified output voltage and a rectified output current, wherein the switch controlled rectifier circuit includes a multi-mode switch circuit which includes at least one multi-mode switch; and a feedback control circuit, configured to operably generate a multi-mode switch control signal for controlling the multi-mode switch circuit according to a voltage feedback signal related to the rectified output voltage and/or a current feedback signal related to the rectified output current, such that the multi-mode switch circuit operates at least in a portion of time in a Resonance Short Circuit Operation to limit a level of the rectified output voltage not larger than a rectified output voltage threshold, and/or to limit a level of the rectified output current not larger than a rectified output current threshold, and/or to regulate the rectified output voltage at a level corresponding to a level of an output voltage reference signal, and/or to regulate the rectified output current at a level corresponding to a level of an output current reference signal; wherein in the “Resonance Short Circuit Operation”, the multi-mode switch circuit operates such that the positive resonant output node and the negative resonant output node are short-circuited.