WIRELESS POWER TRANSMISSION DEVICE

• US 20140092659A1
• Filed: 01/27/2013
• Published: 04/03/2014
• Est. Priority Date: 09/28/2012
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Lin, Huang-Ti, Li, Yueh-Han, Lee, Tsung-Shiun, Liu, Jia-Wei
• Granted Patent: US 9,071,126 B2
• Time in Patent Office: Days
• US Class Current: 363/126
• CPC Class Codes: H02J 50/10 using inductive coupling

Abstract

A wireless power transmission device includes a power transmitter, a first transmission unit, a power receiver, a feedback regulator, a receive controller, and a second transmission unit. The power transmitter is for generating power, and the first transmission unit is for wirelessly transmitting power generated by the power transmitter. The power receiver is for receiving and rectifying the power from the first transmission unit. The feedback regulator is for receiving a feedback signal from the power receiver to generate an AC control signal. The receive controller is for receiving the control signal to generate a driving signal. The second transmission unit is for wirelessly transmitting the control signal to the receive controller.

Claims

1. A wireless power transmission device comprising:

a power transmitter for generating power;

a first transmission unit coupled to the power transmitter for wirelessly transmitting the power generated by the power transmitter;

a power receiver coupled to the first transmission unit for receiving and rectifying the power from the first transmission unit;

a feedback regulator comprising;

a feedback receiver coupled to the power receiver for receiving a feedback signal from the power receiver; and

a command adjuster coupled to the feedback receiver for generating an AC control signal;

a receive controller comprising;

a feedback judge controller for receiving the control signal; and

a control adjuster coupled to the feedback judge controller and the power transmitter for generating a driving signal to adjust the power generated by the power transmitter; and

a second transmission unit coupled between the feedback regulator and the receive controller for wirelessly transmitting the control signal to the receive controller.

2. The wireless power transmission device of claim 1 wherein the feedback signal is a DC signal or an AC signal.

3. The wireless power transmission device of claim 1 wherein the feedback signal is a voltage type or a current type.

4. The wireless power transmission device of claim 1 wherein the first transmission unit comprises:

a first inductive element coupled to the power transmitter; and

a second inductive element coupled to the power receiver;

wherein the first and the second inductive elements are coils and induce the power via magnetic coupling.

5. The wireless power transmission device of claim 1 wherein the feedback receiver comprises:

a rectifier coupled to the power receiver for rectifying the feedback signal, comprising;

a first diode having a first end coupled to the power receiver and a second end coupled to a reference voltage;

a second diode having a first end and a second end, the second end coupled to the first end of the first diode; and

a first capacitor having a first end coupled to the first end of the second diode and a second end coupled to the reference voltage.

6. The wireless power transmission device of claim 5 wherein the command adjuster comprises:

a digital frequency modulator coupled between the feedback receiver and the second transmission unit for generating a frequency signal according to the rectified feedback signal; and

a resonant tank coupled to the digital frequency modulator for generating the control signal according to the frequency signal.

7. The wireless power transmission device of claim 5 wherein the command adjuster comprises:

a digital frequency modulator coupled between the feedback receiver and the second transmission unit for generating a frequency signal according to the rectified feedback signal; and

an amplify circuit coupled to the digital frequency modulator for generating the control signal by amplifying the frequency signal.

8. The wireless power transmission device of claim 5 wherein the feedback receiver further comprises:

a duty modulator coupled to the rectifier;

an inductor coupled to the rectifier; and

a switch for generating a duty signal according to the rectified feedback signal.

9. The wireless power transmission device of claim 8 wherein the command adjuster comprises:

an amplify circuit coupled to the feedback receiver for generating the control signal by amplifying the duty signal.

10. The wireless power transmission device of claim 1 wherein the feedback judge controller comprises:

a comparator coupled between the second transmission unit and the control adjuster for generating a phase signal according to the control signal; and

a rectifier coupled between the second transmission unit and the control adjuster for generating an amplitude signal according to the control signal;

wherein the control adjuster generates the driving signal according to the phase signal and the amplitude signal.

11. The wireless power transmission device of claim 1 wherein the second transmission unit comprises:

a first conductive element coupled to the feedback regulator; and

a second conductive element coupled to the receive controller;

wherein the first conductive element transmits the control signal to the second conductive element via electrical coupling.

12. The wireless power transmission device of claim 11 wherein the first and the second conductive elements are conductive boards or metal probes.

13. A wireless power transmission device comprising:

a power transmitter for generating power;

a first transmission unit coupled to the power transmitter for wirelessly transmitting the power generated by the power transmitter;

a power receiver coupled to the first transmission unit for receiving and rectifying the power from the first transmission unit;

a feedback circuit coupled to the power receiver for detecting a rectified output voltage of the power receiver to generate a feedback control signal;

a phase feedback circuit coupled to the power receiver for detecting a phase of an input voltage of the power receiver to generate a phase signal;

a controller coupled between the feedback circuit and the phase feedback circuit for generating a compensating voltage according to the feedback control signal and the phase signal; and

a regulator device coupled between the controller and the power receiver for generating a regulating voltage according to the compensating voltage to regulate a pre-rectified output voltage of the power receiver by an in phase form or an out of phase form.

14. The wireless power transmission device of claim 13 wherein the feedback circuit comprises:

an amplifier;

a first resistor and a second resistor coupled to the amplifier for dividing the rectified output voltage of the power receiver; and

a plurality of resistors coupled to the amplifier.

15. The wireless power transmission device of claim 13 wherein the feedback control signal is a DC voltage signal.

16. The wireless power transmission device of claim 13 wherein generating the compensating voltage according to the feedback control signal and the phase signal is performed by computing the feedback control signal and the phase signal to derive a predetermined compensating voltage and outputting the predetermined compensating voltage via a set of amplify circuits to generate the compensating voltage.

17. The wireless power transmission device of claim 13 wherein the phase signal is an AC signal.

18. The wireless power transmission device of claim 17 wherein the phase feedback circuit comprises:

at least one amplify circuit for detecting the input voltage of the power receiver to generate the phase signal.

19. The wireless power transmission device of claim 18 wherein the phase feedback circuit further comprises:

a phase regulator coupled between the power receiver and the at least one amplify circuit, comprising a zero cross detector and a bandpass filter for detecting a zero cross of the input voltage and generating a phase regulating signal through the bandpass filter.

20. The wireless power transmission device of claim 13 wherein the regulator device is a transformer or a capacitor.

21. The wireless power transmission device of claim 13 wherein the rectified output voltage of the power receiver is a DC voltage.