Over-voltage protection device for resonant wireless power transmission device and method for controlling the over-voltage protection device

• US 9,847,668 B2
• Filed: 05/13/2015
• Issued: 12/19/2017
• Est. Priority Date: 01/11/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Yu-Su, Park, Se-Ho, Byun, Kang-Ho, Yeo, Sung-Ku
• Primary Examiner(s): Leja, Ronald W
• Application Number:
  US14/711,416
• Publication Number:
  US 20150249361A1
• Time in Patent Office: 951 Days
• Field of Search: 361113
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02H 3/20 responsive to excess voltage
• CPC Class Codes: H02H 9/045 adapted to a particular application and not provided for elsewhere
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00308 Overvoltage protection

Abstract

A wireless power transmission device is provided. The wireless power transmission device includes a resonance signal generator and a controller. The resonance signal generator is configured to transmit wireless power to a wireless power reception device. The controller is configured to adjust the wireless power transmitted to the wireless power reception device, when a predetermined condition caused by over-voltage protection operation at the wireless power reception device is detected.

Claims

1. A wireless power transmission device comprising:

a resonance signal generator configured to transmit wireless power to a wireless power reception device; and

a controller configured to adjust the wireless power to be transmitted to the wireless power reception device, based on a predetermined condition caused by a voltage detected at the resonance signal generator, which exceeds a reference voltage, and by periodically executing an over-voltage protection operation and a release of the over-voltage protection operation at the wireless power reception device during a period.

2. The wireless power transmission device of claim 1, wherein the predetermined condition is a voltage variation at the resonance signal generator.

3. The wireless power transmission device of claim 2, wherein the voltage variation at the resonance signal generator occurs by detuning a resonant frequency of the wireless power reception device.

4. The wireless power transmission device of claim 2, wherein the predetermined condition is that the voltage repetitively increases and decreases with periodicity.

5. The wireless power transmission device of claim 4, wherein the periodicity of the voltage variation is 500 microseconds (μ

S)−

2 milliseconds (mS).

6. The wireless power transmission device of claim 2, if the controller detects the voltage variation at the resonance signal generator, the controller decreases an output of the wireless power transmission device.

7. The wireless power transmission device of claim 6, further comprising:

an amplifier for amplifying inputted power and outputting the amplified power to the resonance signal generator,

wherein the controller controls the amplifier so that the output of the wireless power transmission device is decreased by at least 30%.

8. The wireless power transmission device of claim 6, further comprising:

an amplifier for amplifying inputted power and outputting the amplified power to the resonance signal generator,

wherein the controller controls the amplifier so that the output of the wireless power transmission device is shut down during a preset period.

9. The wireless power transmission device of claim 1, wherein the wireless power reception device changes a resonant frequency as the over-voltage protection operation.

10. A method for controlling a wireless power transmission device comprising:

transmitting wireless power to a wireless power reception device; and

adjusting the wireless power to be transmitted to the wireless power reception device, based on a predetermined condition caused by a voltage detected at a resonance signal generator, which exceeds a reference voltage, and by periodically executing an over-voltage protection operation and a release of the over-voltage protection operation at the wireless power reception device during a period.

11. The method of claim 10, wherein the predetermined condition is a voltage variation at the resonance signal generator of the wireless power transmission device.

12. The method of claim 11, wherein the voltage variation at the resonance signal generator occurs by detuning a resonant frequency of the wireless power reception device.

13. The method of claim 11, wherein the predetermined condition is that the voltage repetitively increases and decreases with periodicity.

14. The method of claim 13, wherein the periodicity of the voltage variation is 500 microseconds (μ

S)−

2 milliseconds (mS).

15. The method of claim 11, further comprising:

decreasing an output of the wireless power transmission device, if the voltage variation at the resonance signal generator is detected.

16. The method of claim 15, wherein decreasing the output of the wireless power transmission device comprises decreasing the output of the wireless power transmission device by at least 30%.

17. The method of claim 15, wherein decreasing the output of the wireless power transmission device comprises shutting down the output of the wireless power transmission device during a preset period.

18. The method of claim 10, wherein the wireless power reception device changes a resonant frequency as the over-voltage protection operation.