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

• US 8,929,043 B2
• Filed: 12/19/2012
• Issued: 01/06/2015
• 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, Kim, Joon-Il, Park, Se-Ho, Park, Sung-Kweon
• Primary Examiner(s): Nguyen, Danny
• Application Number:
  US13/720,242
• Publication Number:
  US 20130176653A1
• Time in Patent Office: 748 Days
• Field of Search: 361/91.1, 361/91.6, 361/111
• US Class Current: 361/91.1
• CPC Class Codes: H02H 9/028 Current limitation by detuning a series resonant circuit H02H9/021, H02H9/023 take precedence
• CPC Class Codes: H02H 9/04 responsive to excess voltage lightning arrestors H01C7/12, H01C8/04, H01G9/18, H01T
• CPC Class Codes: H02H 9/042 comprising means to limit the absorbed power or indicate damaged over-voltage protection device
• CPC Class Codes: H02J 50/10 using inductive coupling
• 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 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge

Abstract

Provided is an over-voltage protection device for a resonant wireless power reception device. The over-voltage protection device includes a resonance signal receiver for receiving a wireless resonance signal transmitted from a wireless power transmission device, an over-voltage protector which is driven by a driver in an over-voltage protection operation to detune a resonance frequency of the reception device, thereby reducing reception power, the driver for driving the over-voltage protector according to a control signal in the over-voltage protection operation, and a controller for outputting the control signal for driving the over-voltage protector to the driver when it is determined that over-voltage occurs.

Claims

1. An over-voltage protection device for a resonant wireless power reception device, the over-voltage protection device comprising:

a resonance signal receiver including a resonator for receiving a wireless resonance signal transmitted from a wireless power transmission device;

an over-voltage protector which is driven by a driver in an over-voltage protection operation to detune a resonance frequency of the reception device, thereby reducing reception power;

the driver for driving the over-voltage protector according to a control signal in the over-voltage protection operation; and

a controller for outputting the control signal for driving the over-voltage protector to the driver when it is determined that over-voltage occurs;

wherein the over-voltage protector includes detuning capacitors for detuning a resonance frequency of the resonator, and detrimentally affects receiving performance of the resonance signal receiver.

2. The over-voltage protection device of claim 1, wherein the over-voltage protector comprises resonance-detuning first and second capacitors which are connected with two connection terminals of a resonator of the resonance signal receiver, respectively.

3. The over-voltage protection device of claim 2, wherein the driver comprises a switch structure in which the driver performs a switching operation according to the control signal output from the controller to connect the first and second capacitors of the over-voltage protector to a ground terminal.

4. The over-voltage protection device of claim 2, wherein capacities of the first and second capacitors are selected such that Δ

S21 is 30% or more in Δ

S21=(S21)−

(S21 in over-voltage protection state), wherein S21 is a rate of power transferred from the transmission device to the reception device.

5. The over-voltage protection device of claim 3, wherein capacities of the first and second capacitors are selected such that Δ

S21 is 30% or more in Δ

S21=(S21)−

(S21 in over-voltage protection state), wherein S21 is a rate of power transferred from the transmission device to the reception device.

6. The over-voltage protection device of claim 2, wherein capacities of the first and second capacitors are set to be larger than 2 nano Farads (2 nF).

7. The over-voltage protection device of claim 3, wherein capacities of the first and second capacitors are set to be larger than 2 nano Farads (2 nF).

8. The over-voltage protection device of claim 1, further comprising:

a rectifier for rectifying Alternating Current (AC) power received in the resonance signal receiver into a Direct Current (DC) power; and

an auxiliary over-voltage protector comprising a Zener Diode (ZD) which has a breakdown voltage to additionally protect an over-voltage on an output terminal of the rectifier.

9. The over-voltage protection device of claim 2, further comprising:

a rectifier for rectifying Alternating Current (AC) power received in the resonance signal receiver into a Direct Current (DC) power; and

an auxiliary over-voltage protector comprising a Zener Diode (ZD) which has a breakdown voltage to additionally protect an over-voltage on an output terminal of the rectifier.

10. The over-voltage protection device of claim 3, further comprising:

a rectifier for rectifying Alternating Current (AC) power received in the resonance signal receiver into a Direct Current (DC) power; and

an auxiliary over-voltage protector comprising a Zener Diode (ZD) which has a breakdown voltage to additionally protect an over-voltage on an output terminal of the rectifier.

11. An over-voltage protection method of an over-voltage protection device for a resonant wireless power reception device, the over-voltage protection method comprising:

monitoring an input voltage of a constant-voltage generator;

determining whether the input voltage is higher than an over-voltage protection start reference voltage, and performing an over-voltage protection operation by detuning a resonance frequency if the input voltage is higher than the over-voltage protection start reference voltage; and

releasing the over-voltage protection operation of detuning the resonance frequency if the input voltage of the constant-voltage generator is lower than the over-voltage protection start reference voltage during the performing of the over-voltage protection operation.

12. The over-voltage protection method of claim 11, wherein detuning the resonance frequency comprises connecting a resonator of a resonance signal receiver to preset detuning first and second capacitors.

13. The over-voltage protection method of claim 11, wherein the resonance frequency is detuned such that Δ

S21 is 30% or more in Δ

S21=(S21)−

(S21 in over-voltage protection state), wherein S21 is a rate of power transferred from the transmission device to the reception device.

14. The over-voltage protection method of claim 12, wherein the resonance frequency is detuned such that Δ

S21 is 30% or more in Δ

S21=(S21)−

(S21 in over-voltage protection state), wherein S21 is a rate of power transferred from the transmission device to the reception device.