APPARATUS FOR AND METHOD OF PROTECTING WIRELESS-COUPLED POWER DEVICES FROM OVERVOLTAGE, OVERCURRENT, AND OVERTEMPERATURE USING HYSTERESIS

• US 20150318713A1
• Filed: 07/10/2015
• Published: 11/05/2015
• Est. Priority Date: 05/17/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: KIM, Dong Zo, KWON, Sang Wook, PARK, Yun Kwon, PARK, Eun Seok, HONG, Young Tack, KIM, Ki Young, RYU, Young Ho, KIM, Nam Yun, CHOI, Jin Sung, YOON, Chang Wook
• Granted Patent: US 9,966,799 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02H 3/08 responsive to excess current responsive to abnormal temperature caused by excess current H02H5/04
• CPC Class Codes: H02H 3/20 responsive to excess voltage
• CPC Class Codes: H02H 5/042 using temperature dependent resistors
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• 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

Abstract

An overvoltage protecting unit and an overcurrent protecting unit protect a power device from an overvoltage and an overcurrent using a comparator having hysteresis. An overtemperature protecting unit protects the power device from an overtemperature using a thermistor having a resistance that changes as a temperature of the thermistor changes.

Claims

1. An apparatus for wireless power transmission, the apparatus comprising:

a power device;

an overvoltage protecting unit and an overcurrent protecting unit configured to protect the power device; and

a control unit configured to perform an operation on an output signal of the overvoltage protecting unit and an output signal of the overcurrent protecting unit, and determine whether an input signal is transmitted to the power device in response to an operation result.

2. The apparatus of claim 1, further comprising:

an overtemperature protecting unit configured to adjust a level of a bias voltage of the power device using a thermistor.

3. The apparatus of claim 1, wherein the control unit comprises:

an OR gate configured to perform an OR operation on the output signal of the overvoltage protecting unit and the output signal of the overcurrent protecting unit; and

a NAND gate configured to perform a NAND operation on an output signal of the OR gate and the input signal.

4. The apparatus of claim 1, wherein when at least one of the output signal of the overvoltage protecting unit and the output signal of the overcurrent protecting unit is a first level, the control unit transmits the input signal to the power device.

5. The apparatus of claim 1, wherein when each of the output signal of the overvoltage protecting unit and the output signal of the overcurrent protecting unit is a second level, the control unit block the input signal from being input to the power device.

6. The apparatus of claim 1, wherein when each of the output signal of the overvoltage protecting unit and the output signal of the overcurrent protecting unit is a second level, the control unit block the input signal from being input to the power device.

7. The apparatus of claim 1, wherein the overvoltage protecting unit detects an overvoltage of the power device using an hysteresis comparator.

8. The apparatus of claim 1, wherein the overcurrent protecting unit detects an overcurrent of the power device using at least one hysteresis comparator.

9. A method of an apparatus for wireless power transmission, the method comprising:

performing an operation on an output signal of an overvoltage protecting unit and an output signal of an overcurrent protecting unit; and

determining whether an input signal is transmitted to the power device in response to an operation result.

10. The method of claim 9, further comprising:

adjusting a level of a bias voltage of the power device using a thermistor.

11. The method of claim 9, wherein the performing comprises:

performing an OR operation on the output signal of the overvoltage protecting unit and the output signal of the overcurrent protecting unit.

12. The method of claim 11, wherein the determining comprises:

performing a NAND operation on an OR operation result and the input signal.

13. The method of claim 9, wherein when at least one of the output signal of the overvoltage protecting unit and the output signal of the overcurrent protecting unit is a first level, the determining comprises transmitting the input signal to the power device.

14. The method of claim 9, wherein when each of the output signal of the overvoltage protecting unit and the output signal of the overcurrent protecting unit is a second level, the determining comprises blocking the input signal from being input to the power device.