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

• US 9,853,505 B2
• Filed: 05/02/2016
• Issued: 12/26/2017
• Est. Priority Date: 05/15/2015
• Status: Active Grant

• Current Assignee: Richtek Technology Corporation (MediaTek, Inc.)
• Original Assignee: Richtek Technology Corporation (MediaTek, Inc.)
• Inventors: Liu, Kuo-Chi, Wei, Wei-Hsin
• Primary Examiner(s): Houston, Adam
• Application Number:
  US15/144,553
• Publication Number:
  US 20160336808A1
• Time in Patent Office: 603 Days
• Field of Search: 307104, 307108
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02M 7/217 using semiconductor devices only
• CPC Class Codes: H02M 7/219 in a bridge configuration
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

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.

Claims

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.

2. The resonant wireless power receiver circuit of claim 1, wherein the switch controlled rectifier circuit includes a bridge rectifier circuit which includes a first rectifier device, a second rectifier device, and the multi-mode switch circuit, wherein the multi-mode switch circuit 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;

wherein the feedback control circuit controls the first and the second multi-mode switches by the multi-mode switch control signal, such that the first and the second multi-mode switches operate 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 at the level corresponding to the level of the output voltage reference signal, and/or to regulate the rectified output current at the level corresponding to the level of the output current reference signal.

3. The resonant wireless power receiver circuit of claim 2, wherein the switch control circuit is configured to operably control the first and the second multi-mode switches by the multi-mode switch control signal to operate in the Resonance Short Circuit Operation so as to limit a level of the AC resonant signal when the level of the rectified output voltage is larger than the rectified output voltage threshold and/or when the level of the rectified output current is larger than the rectified output current threshold, such that the level of the rectified output voltage is limited to be not larger than the rectified output voltage threshold, and/or the level of the rectified output current is limited to be not larger than the rectified output current threshold.

4. The resonant wireless power receiver circuit of claim 1, wherein the resonant circuit further includes an impedance matching circuit which includes one impedance matching capacitor coupled to the receiver coil in series or in parallel, or which includes two or more impedance matching capacitors coupled in series, or in parallel, or in a combination of parallel and series, and the two or more impedance matching capacitors being coupled to the receiver coil.

5. The resonant wireless power receiver circuit of claim 2, wherein the first rectifier device and the second rectifier device are configured as (A), (B), or (C):

(A) each of the first rectifier device and the second rectifier device including a diode, wherein the anodes and the cathodes of the diodes correspond to the current inflow nodes and the current outflow nodes of the first rectifier device and the second rectifier device respectively;

(B) the first rectifier device including a third multi-mode switch and the second rectifier device including a forth multi-mode switch, wherein the feedback control circuit controls the third multi-mode switch and the forth multi-mode switch by the multi-mode switch control signal to operate in the Synchronous Rectifying Switching Operation;

or

(C) the first rectifier device and the second rectifier device being a combination of a diode and a third multi-mode switch, wherein the anode and the cathode of the diode correspond to the current inflow node and the current outflow node of the first rectifier device or the second rectifier device, and the feedback control circuit controls the third multi-mode switch by the multi-mode switch control signal to operate in the Synchronous Rectifying Switching Operation.

6. The resonant wireless power receiver circuit of claim 1, wherein each of the first and the second multi-mode switches includes a semiconductor switch.

7. The resonant wireless power receiver circuit of claim 1, wherein the bridge rectifier circuit further includes a first bypass diode and a second bypass diode, the first and the second multi-mode switches being connected to the first and the second bypass diode in parallel respectively.

8. The resonant wireless power receiver circuit of claim 1, wherein the switch controlled rectifier circuit further includes a rectifier device, and each of the rectifier device and the multi-mode switch has a current inflow node and a current outflow node;

wherein the multi-mode switch and the rectifier device are 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;

wherein the feedback control circuit controls the multi-mode switch by the multi-mode switch control signal, such that the multi-mode switch operate in a time-divided combination of a Synchronous Rectifying Switching Operation and a Resonance Short Circuit Operation to regulate the rectified output voltage at the level corresponding to the level the output voltage reference signal, and/or to regulate the rectified output current at the level corresponding to the level of the output current reference signal.

9. The resonant wireless power receiver circuit of claim 8, wherein the switch control circuit is configured to operably control the multi-mode switch by the multi-mode switch control signal to operate in the Resonance Short Circuit Operation so as to limit a level of the AC resonant signal when the voltage level of the rectified output voltage is larger than the rectified output voltage threshold and/or when the current level of the rectified output current is larger than the rectified output current threshold, such that the level of the rectified output voltage is limited to be not larger than the rectified output voltage threshold, and/or the level of the rectified output current is limited to be not larger than the rectified output current threshold.

10. The resonant wireless power receiver circuit of claim 8, wherein the resonant circuit further includes an impedance matching circuit which includes one impedance matching capacitor coupled to the receiver coil in series or in parallel, or which includes two or more impedance matching capacitors coupled in series, or in parallel, or in a combination of parallel and series, and the two or more impedance matching capacitors being coupled to the receiver coil.

11. The resonant wireless power receiver circuit of claim 8, wherein the rectifier device is configured as (A) or (B):

(A) the rectifier device including a diode, wherein the anode and the cathode of the diode correspond to the current inflow node and the current outflow node of the rectifier device respectively;

or

(B) the rectifier device includes another multi-mode switch, wherein the feedback control circuit controls this another multi-mode switch by the multi-mode switch control signal to operate in the Synchronous Rectifying Switching Operation.

12. The resonant wireless power receiver circuit of claim 8, wherein the multi-mode switch includes a semiconductor switch.

13. The resonant wireless power receiver circuit of claim 8, wherein the switch controlled rectifier circuit further includes a bypass diode connected to the multi-mode switch in parallel.

14. 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.

15. The feedback control circuit of claim 14, wherein the resonant circuit further includes an impedance matching circuit which includes one impedance matching capacitor coupled to the receiver coil in series or in parallel, or which includes two or more impedance matching capacitors coupled in series, or in parallel, or in a combination of parallel and series, and the two or more impedance matching capacitors being coupled to the receiver coil.

16. The feedback control circuit of claim 14, wherein the first rectifier device and the second rectifier device are configured as (A), (B), or (C):

(A) each of the first rectifier device and the second rectifier device including a diode respectively, wherein the anodes and the cathodes of the diodes correspond to the current inflow nodes and the current outflow nodes of the first rectifier device and the second rectifier device respectively;

(B) the first rectifier device and the second rectifier device including a third multi-mode switch and a forth multi-mode switch, respectively, wherein the feedback control circuit controls the third multi-mode switch and the forth multi-mode switch by the multi-mode switch control signal to operate in the Synchronous Rectifying Switching Operation;

or

(C) the first rectifier device and the second rectifier device being a combination of a diode and a third multi-mode switch, wherein the anode and the cathode of the diode correspond to the current inflow node and the current outflow node of the first rectifier device or the second rectifier device, and the feedback control circuit controls the third multi-mode switch by the multi-mode switch control signal to operate in the Synchronous Rectifying Switching Operation.

17. The feedback control circuit of claim 14, wherein each of the first and the second multi-mode switches includes a semiconductor switch.

18. The feedback control circuit of claim 14, wherein the bridge rectifier circuit further includes a first bypass diode and a second bypass diode, and the first and the second multi-mode switches are connected to the first and the second bypass diode in parallel respectively.

19. 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.

20. The feedback control circuit of claim 19, wherein the first rectifier device and the second rectifier device are configured as (A), (B), or (C):

(A) each of the first rectifier device and the second rectifier device including a diode respectively, wherein the anodes and the cathodes of the diodes correspond to the current inflow nodes and the current outflow nodes of the first rectifier device and the second rectifier device respectively;

(B) the first rectifier device and the second rectifier device including a third multi-mode switch and a forth multi-mode switch, respectively, wherein the feedback control circuit controls the third multi-mode switch and the forth multi-mode switch by the multi-mode switch control signal to operate in the Synchronous Rectifying Switching Operation;

or

(C) the first rectifier device and the second rectifier device being a combination of a diode and a third multi-mode switch, wherein the anode and the cathode of the diode correspond to the current inflow node and the current outflow node of the first rectifier device or the second rectifier device, and the feedback control circuit controls the third multi-mode switch by the multi-mode switch control signal to operate in the Synchronous Rectifying Switching Operation.

21. 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.

22. The feedback control circuit of claim 21, wherein the resonant circuit further includes an impedance matching circuit which includes one impedance matching capacitor coupled to the receiver coil in series or in parallel, or which includes two or more impedance matching capacitors coupled in series, or in parallel, or in a combination of parallel and series, and the two or more impedance matching capacitors being coupled to the receiver coil.

23. The feedback control circuit of claim 21, wherein the rectifier device is configured as (A) or (B):

(A) the rectifier device including a diode, wherein the anode and the cathode of the diode correspond to the current inflow node and the current outflow node of the rectifier device respectively;

or

(B) the rectifier device including another multi-mode switch, wherein the feedback control circuit controls this another multi-mode switch by the multi-mode switch control signal to operate in the Synchronous Rectifying Switching Operation.

24. The feedback control circuit of claim 21, wherein the multi-mode switch includes a semiconductor switch.

25. The feedback control circuit of claim 21, wherein the switch controlled rectifier circuit further includes a bypass diode connected to the multi-mode switch in parallel.

26. 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.

27. The feedback control circuit of claim 26, wherein the rectifier device is configured as (A) or (B):

(A) the rectifier device including a diode, wherein the anode and the cathode of the diode correspond to the current inflow node and the current outflow node of the rectifier device respectively;

or

(B) the rectifier device including another multi-mode switch, wherein the feedback control circuit controls this another multi-mode switch by the multi-mode switch control signal to operate in the Synchronous Rectifying Switching Operation.

28. 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.

29. The resonant wireless power conversion method of claim 28, wherein the switch controlled rectifier circuit includes a bridge rectifier circuit which includes a first rectifier device, a second rectifier device, and the 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;

wherein the step of converting the AC resonant signal to generate a rectified output signal further includes;

controlling the first and the second multi-mode switches by the multi-mode switch control signal, such that the first and the second multi-mode switches operate 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 at a level corresponding to a level the output voltage reference signal, and/or to regulate the rectified output current at a level corresponding to a level of the output current reference signal.

30. The resonant wireless power conversion method of claim 29, wherein the step of converting the AC resonant signal to generate a rectified output signal further includes:

controlling the first and the second multi-mode switches by the multi-mode switch control signal to operate in the Resonance Short Circuit Operation so as to limit a level of the AC resonant signal when the level of the rectified output voltage is larger than the rectified output voltage threshold and/or when the level of the rectified output current is larger than the rectified output current threshold, such that the level of the rectified output voltage is limited to be not larger than the rectified output voltage threshold, and/or the level of the rectified output current is limited to be not larger than the rectified output current threshold.

31. The resonant wireless power conversion method of claim 28, wherein each of the first and the second multi-mode switches includes a semiconductor switch.

32. The resonant wireless power conversion method of claim 28, wherein the bridge rectifier circuit further includes a first bypass diode and a second bypass diode, and the first and the second multi-mode switches are connected to the first and the second bypass diode in parallel respectively.

33. The resonant wireless power conversion method of claim 28, wherein the switch controlled rectifier circuit further includes a rectifier device, and each of the rectifier device and the multi-mode switch has a current inflow node and a current outflow node;

wherein the multi-mode switch and the rectifier device are 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;

wherein the step of converting the AC resonant signal to generate a rectified output signal further includes;

controlling the multi-mode switch by the multi-mode switch control signal, such that the multi-mode switch operate in a time-divided combination of a Synchronous Rectifying Switching Operation and a Resonance Short Circuit Operation to regulate the rectified output voltage at the level corresponding to the level the output voltage reference signal, and/or to regulate the rectified output current at the level corresponding to the level of the output current reference signal.

34. The resonant wireless power conversion method of claim 33, wherein the step of converting the AC resonant signal to generate a rectified output signal further includes:

controlling the multi-mode switch by the multi-mode switch control signal to operate in the Resonance Short Circuit Operation so as to limit the level of the AC resonant signal when the voltage level of the rectified output voltage is larger than the rectified output voltage threshold and/or when the current level of the rectified output current is larger than the rectified output current threshold, such that the level of the rectified output voltage is limited to be not larger than the rectified output voltage threshold, and/or the level of the rectified output current is limited to be not larger than the rectified output current threshold.

35. The resonant wireless power conversion method of claim 33, wherein the multi-mode switch includes a semiconductor switch.

36. The resonant wireless power conversion method of claim 33, wherein the switch controlled rectifier circuit further includes a bypass diode connected to the multi-mode switch in parallel.