Resonant wireless power receiver circuit and control circuit and wireless power conversion method thereof

A feedback control circuit, configured to operably control a resonant wireless power receiver circuit which comprises:

• 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;
• and a bridge 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 bridge rectifier circuit includes a first rectifier device, a second rectifier device, and a multi-mode switch circuit which includes a first multi-mode switch and a second multi-mode switch, wherein each of the first rectifier device, the second rectifier device, the first multi-mode switch and the second multi-mode switch has a current inflow node and a current outflow node;
• wherein the bridge rectifier circuit is configured as (A) or (B):
• (A) the current outflow nodes of the first rectifier device and the second rectifier device being connected to each other at the rectified output node;
• the current inflow nodes of the first multi-mode switch and the second multi-mode switch being connected to each other at the ground node;
• the current inflow node of the first rectifier device and the current outflow node of the first multi-mode switch being connected to each other at the negative resonant output node;
• and the current inflow node of the second rectifier device and the current outflow node of the second multi-mode switch being connected to each other at the positive resonant output node;
• or (B) the current outflow nodes of the first multi-mode switch and the second multi-mode switch being connected to each other at the rectified output node;
• the current inflow nodes of the first rectifier device and the second rectifier device being connected to each other at the ground node;
• the current inflow node of the first multi-mode switch and the current outflow node of the first rectifier device being connected to each other at the negative resonant output node;
• and the current inflow node of the second multi-mode switch and the current outflow node of the second rectifier device being connected to each other at the positive resonant output node;
• the feedback control circuit includes:
• an error feedback circuit, configured to operably generate a voltage error feedback signal according to a voltage feedback signal related to the rectified output voltage and/or to generate a current error feedback signal according to a current feedback signal related to the rectified output current;
• a synchronous control circuit, configured to operably generate a synchronous control signal according to the rectified output signal and the AC resonant signal;
• and
• a switch control circuit, configured to operably generate a multi-mode switch control signal for controlling the multi-mode switch circuit according to the voltage error feedback signal and/or the current error feedback signal such that the multi-mode switch circuit operates in a time-divided combination of any two or more among a Synchronous Rectifying Switching Operation, a Resonance Short Circuit Operation, and an OSOC (One Synchronous-rectifying-switching, One Conductive Operation) Operation to regulate the rectified output voltage to a level corresponding to a level of the output voltage reference signal, and/or to regulate the rectified output current to a level corresponding to a level of the 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.

A feedback control circuit, configured to operably control a resonant wireless power receiver circuit which comprises:

• 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;
• and a bridge 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 bridge rectifier circuit includes a first rectifier device, a second rectifier device, and a multi-mode switch circuit which includes a first multi-mode switch and a second multi-mode switch, wherein each of the first rectifier device, the second rectifier device, the first multi-mode switch and the second multi-mode switch has a current inflow node and a current outflow node;
• wherein the bridge rectifier circuit is configured as (A) or (B):
• (A) the current outflow nodes of the first rectifier device and the second rectifier device are connected to each other at the rectified output node;
• the current inflow nodes of the first multi-mode switch and the second multi-mode switch being connected to each other at the ground node;
• the current inflow node of the first rectifier device and the current outflow node of the first multi-mode switch being connected to each other at the negative resonant output node;
• and the current inflow node of the second rectifier device and the current outflow node of the second multi-mode switch being connected to each other at the positive resonant output node;
• or (B) the current outflow nodes of the first multi-mode switch and the second multi-mode switch being connected to each other at the rectified output node;
• the current inflow nodes of the first rectifier device and the second rectifier device being connected to each other at the ground node;
• the current inflow node of the first multi-mode switch and the current outflow node of the first rectifier device being connected to each other at the negative resonant output node;
• and the current inflow node of the second multi-mode switch and the current outflow node of the second rectifier device being connected to each other at the positive resonant output node;
• the feedback control circuit includes:
• a threshold determination circuit which includes a comparing circuit, configured to operably generate a threshold determination signal by comparing the rectified output voltage with a rectified output voltage threshold or by comparing the rectified output current with a rectified output current threshold;
• and
• a switch control circuit, configured to operably generate a multi-mode switch control signal for controlling the multi-mode switch circuit according to the threshold determination signal such that the multi-mode switch circuit operates in the Resonance Short Circuit Operation so as to limit a level of the AC resonant signal, and such that a level of the rectified output voltage is limited to be not larger than the rectified output voltage threshold, and/or a level of the rectified output current is limited to be not larger than the rectified output current threshold;
• 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.

A feedback control circuit, configured to operably control a resonant wireless power receiver circuit which comprises:

• 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;
• and 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 rectifier device and a multi-mode switch, wherein each of the rectifier device and the multi-mode switch has a current inflow node and a current outflow node;
• wherein the switch controlled rectifier circuit is configured as (A) or (B):
• (A) the current outflow node of the multi-mode switch and the current inflow node of the rectifier device being connected to each other at the positive resonant output node, the current inflow node of the multi-mode switch being connected to the negative resonant output node, the current outflow node of the rectifier device being connected to the rectified output node, and the negative resonant output node being connected to the ground node;
• or (B) the current inflow node of the multi-mode switch and the current outflow node of the rectifier device being connected to each other at the positive resonant output node, the current outflow node of the multi-mode switch being connected to the rectified output node, the current inflow node of the rectifier device being connected to the ground node, the negative resonant output node being connected to the rectified output node;
• the feedback control circuit includes:
• an error feedback circuit, configured to operably generate a voltage error feedback signal according to a voltage feedback signal related to the rectified output voltage and/or to generate a current error feedback signal according to a current feedback signal related to the rectified output current;
• a synchronous control circuit, configured to operably generate a synchronous control signal according to the rectified output signal and the AC resonant signal;
• and
• a switch control circuit, configured to operably generate a multi-mode switch control signal for controlling the multi-mode switch according to the voltage error feedback signal and/or the current error feedback signal such that the multi-mode switch operates in a time-divided combination of a Synchronous Rectifying Switching Operation and a Resonance Short Circuit Operation to regulate a level of the rectified output voltage corresponding to a level the output voltage reference signal, and/or to regulate a level of the rectified output current corresponding to a level of the output current reference signal;
• wherein in the “Resonance Short Circuit Operation”, the multi-mode switch operates such that the positive resonant output node and the negative resonant output node are short-circuited.

A feedback control circuit, configured to operably control a resonant wireless power receiver circuit which comprises:

• 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;
• and 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 rectifier device and a multi-mode switch, wherein each of the rectifier device and the multi-mode switch has a current inflow node and a current outflow node;
• wherein the switch controlled rectifier circuit is configured as (A) or (B):
• (A) the current outflow node of the multi-mode switch and the current inflow node of the rectifier device being connected to each other at the positive resonant output node, the current inflow node of the multi-mode switch being connected to the negative resonant output node, the current outflow node of the rectifier device being connected to the rectified output node, and the negative resonant output node being connected to the ground node;
• or (B) the current inflow node of the multi-mode switch and the current outflow node of the rectifier device being connected to each other at the positive resonant output node, the current outflow node of the multi-mode switch being connected to the rectified output node, the current inflow node of the rectifier device being connected to the ground node, the negative resonant output node being connected to the rectified output node;
• the feedback control circuit includes:
• a threshold determination circuit which includes a comparing circuit, configured to operably generate a threshold determination signal by comparing the rectified output voltage with a rectified output voltage threshold or by comparing the rectified output current with a rectified output current threshold;
• and
• a switch control circuit, configured to operably generate a multi-mode switch control signal for controlling the multi-mode switch according to the threshold determination signal such that the multi-mode switch operates in the Resonance Short Circuit Operation so as to limit a level of the AC resonant signal, and such that a level of the rectified output voltage is limited to be not larger than the rectified output voltage threshold, and/or a level of the rectified output current is limited to be not larger than the rectified output current threshold;
• wherein in the “Resonance Short Circuit Operation”, the multi-mode switch operates such that the positive resonant output node and the negative resonant output node are short-circuited.

A resonant wireless power conversion method, wherein a resonant circuit receives a wireless power and 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;

• the resonant wireless power conversion method includes:
• controlling a switch controlled rectifier circuit to 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
• generating 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.