Method and apparatus for controlling abnormal condition in wireless power receiver

• US 9,379,574 B2
• Filed: 05/05/2014
• Issued: 06/28/2016
• Est. Priority Date: 05/03/2013
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Noh, Yun-Jeong, Park, Se-ho, Lee, Ho-Seong, Byun, Kang-Ho, Lee, Kyung-Woo, Kim, Yu-Su, Ha, Min-Cheol
• Primary Examiner(s): Tso, Edward
• Application Number:
  US14/269,514
• Publication Number:
  US 20140327393A1
• Time in Patent Office: 785 Days
• Field of Search: 320/108, 320/114, 320/150, 320/153
• US Class Current: 1/1
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• 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 7/00308 Overvoltage protection
• CPC Class Codes: H02J 7/00309 Overheat or overtemperature protection
• CPC Class Codes: H02J 7/0031 using battery or load disconnect circuits H02J9/002 takes precedence
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters

Abstract

A method for controlling an abnormal state of a wireless Power Receiving Unit (PRU) is provided. The method includes measuring a temperature by a period shorter than a previous measurement period when a temperature measured by the wireless PRU in response to a transmission of power from a wireless Power Transmitting Unit (PTU) is higher than a temperature required to be monitored; determining whether the measured temperature is higher than a temperature at which a load switch connected to a charging unit is turned off if the measured temperature is equal to or higher than the temperature required to be monitored; and turning off the load switch if the measured temperature is higher than the temperature at which the load switch is turned off.

Claims

1. A method for controlling an abnormal condition of a wireless Power Receiving Unit (PRU), the method comprising:

measuring a temperature of the wireless PRU by a period shorter than a previous measurement period when a temperature measured by the wireless PRU in response to a transmission of power from a wireless Power Transmitting Unit (PTU) is higher than a temperature required to be monitored;

determining whether the measured temperature is higher than a temperature at which a load switch connected to a charging unit is turned off if the measured temperature is equal to or higher than the temperature required to be monitored; and

turning off the load switch if the measured temperature is higher than the temperature at which the load switch is turned off.

2. The method as claimed in claim 1, further comprising:

determining whether the measured temperature is higher than a predetermined over-temperature, after the load switch is turned off; and

notifying wireless PTU of an over-temperature state so that the wireless PTU interrupts the transmission of the power, if it is determined that the measured temperature is higher than the predetermined over-temperature.

3. The method as claimed in claim 1, further comprising:

notifying of a status of the load switch after the load switch is turned off.

4. The method as claimed in claim 3, wherein the load switch status is transmitted to the wireless PTU by using a PRU dynamic signal.

5. The method as claimed in claim 1, further comprising:

turning on the load switch if the measured temperature is lower than a temperature at which the load switch must be turned off after the load switch is turned off.

6. The method as claimed in claim 2, further comprising:

determining whether an over-temperature recovery (OTR) interrupt occurs for a predetermined time if the measured temperature is higher than the predetermined over-temperature.

7. The method as claimed in claim 6, further comprising:

turning on the load switch if the OTR interrupt occurs within the predetermined time.

8. The method as claimed in claim 6, wherein the notifying of the over-temperature state to the wireless PTU includes notifying the wireless PTU of an over-temperature if the OTR interrupt does not occur within the predetermined time.

9. The method as claimed in claim 1, further comprising:

determining whether an Negative Temperature Coefficient High (NTCH) interrupt occurs; and

measuring a temperature by a period shorter than the previous measurement period when the NTCH interrupt occurs.

10. The method as claimed in claim 1, further comprising:

turning on a detuning capacitor if a voltage measured in the wireless PTU corresponds to a power transmission from the wireless PTU;

determining whether the measured voltage is higher than a predetermined overvoltage after the detuning capacitor is turned off; and

turning off the detuning capacitor if the measured voltage is lower than the predetermined overvoltage.

11. The method as claimed in claim 10, further comprising:

notifying a wireless PTU of an overvoltage state if it is determined that the measured temperature is higher than the predetermined overvoltage.

12. A wireless Power Receiving Unit (PRU) for controlling an abnormal state, the wireless PRU comprising:

a temperature measurement unit which measures a temperature of the wireless PRU corresponding to a power transmission from a wireless Power Transmitting Unit (PTU); and

a controller which controls to measure a temperature by a period shorter than a previous measurement period if a measurement temperature is higher than a temperature required to be monitored, to determine whether the measured temperature is higher than a temperature at which a load switch is turned off if the measured temperature is higher than a temperature required to be monitored, and to turn off the load switch if the measured temperature is higher than a temperature at which the load switch is turned off.

13. The wireless PRU as claimed in claim 12, wherein the controller controls to determine whether the measured temperature is higher than a predetermined over-temperature after the load switch is turned off, and to notify the wireless PTU of an over-temperature state so that the wireless PTU interrupts the power transmission if the measured temperature is higher than the predetermined over-temperature.

14. The wireless PRU as claimed in claim 13, further comprising:

a communication unit which transmits a signal notifying of the over-temperature state.

15. The wireless PRU as claimed in claim 13, wherein the controller transmits a signal notifying of a state of the load switch through the communication unit after the load switch is turned off.

16. The wireless PRU as claimed in claim 15, wherein the state of the load switch is transmitted to the wireless PTU by using a PRU dynamic signal.

17. The wireless PRU as claimed in claim 12, wherein the controller turns on the load switch if the measured temperature is lower than a temperature at which the load switch must be turned off after the load switch is turned off.

18. The wireless PRU as claimed in claim 12, wherein the controller determines whether an overtemperature recovery (OTR) interrupt occurs for a predetermined time if the measured temperature is higher than the predetermined over-temperature.

19. The wireless PRU as claimed in claim 12, wherein the temperature measuring unit measures a temperature of an output terminal of a rectifier or a temperature of a battery of the PRU.