Apparatus for receiving wireless power and method of controlling same

• US 10,284,002 B2
• Filed: 06/27/2017
• Issued: 05/07/2019
• Est. Priority Date: 07/29/2016
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Jung-Min, Ha, Young-Mi, Son, Hong-Min, Cho, Sung-Joon
• Primary Examiner(s): Memula, Suresh
• Application Number:
  US15/633,947
• Publication Number:
  US 20180034305A1
• Time in Patent Office: 679 Days
• Field of Search: 320108
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H02J 7/00304 Overcurrent protection
• CPC Class Codes: H02J 7/007192 in response to temperature

Abstract

A reception device for receiving wireless power may include: a power reception circuit configured to wirelessly receive power from a transmission device, rectify the received power, and output the rectified power; a charger configured to process the rectified power received from the power reception circuit and charge a battery of the reception device or output the rectified power to a system of the reception device; and a control circuit configured to, when an event for changing an input current limit of the charger is detected, gradually change the input current limit of the charger by stepping up or stepping down the input current limit to one or more intermediary values until the input current limit reaches a predetermined value.

Claims

1. A reception device for receiving wireless power, the reception device comprising:

a power reception circuit configured to wirelessly receive power from a transmission device, rectify the received power, and output the rectified power;

a charger configured to process the rectified power received from the power reception circuit and charge a battery of the reception device or output the rectified power to a system of the reception device; and

a control circuit configured to, when an event for changing an input current limit of the charger is detected, gradually change the input current limit of the charger by stepping up or stepping down the input current limit to one or more intermediary values until the input current limit reaches a predetermined value,

wherein when the event for changing the input current limit of the charger corresponds to a change of an input current of the charger over a first time period that causes a disconnection between the reception device and the transmission device, the input current of the charger is gradually changed over a second time period longer than the first time period, such that connection between the reception device and the transmission device is maintained.

2. The reception device of claim 1, wherein, when a requested amount of a change in the input current limit of the charger is larger than a preset threshold value, the control circuit is configured to gradually change the input current limit of the charger by stepping up or stepping down the input current limit to the one or more intermediary values until the input current limit reaches the predetermined value.

3. The reception device of claim 1, wherein when the event for changing the input current limit of the charger corresponds to a request for decreasing an output current of the charger, the control circuit is configured to:

gradually decrease the input current limit of the charger by stepping down the input current limit to the one or more intermediary values until the input current limit reaches the predetermined value, and

decrease a setting value of the output current of the charger after the decreasing of the input current limit of the charger is finished.

4. The reception device of claim 1, wherein when the event for changing the input current limit of the charger corresponds to a request for increasing an output current of the charger, the control circuit is configured to:

increase a setting value of the output current of the charger, and

after the setting value of the output current of the charger is increased, gradually increase the input current limit of the charger by stepping up the input current limit to the one or more intermediary values until the input current limit reaches the predetermined value.

5. The reception device of claim 1, wherein when the event for changing the input current limit of the charger corresponds to a detection of a full charge of the battery, the control circuit is configured to decrease the input current limit of the charger to a preset value.

6. The reception device of claim 5, wherein when re-initiation of charging of the battery is requested, the control circuit is configured to increase the input current limit of the charger.

7. The reception device of claim 1, wherein when the event for changing the input current limit of the charger corresponds to detection of output voltage change information from the transmission device, the control circuit is configured to gradually change the input current limit of the charger by stepping down the input current limit to the one or more intermediary values until the input current limit reaches the predetermined value.

8. The reception device of claim 7, wherein after output voltage change by the transmission device is complete, the control circuit is configured to gradually re-adjust the input current limit of the charger by stepping up the input current limit to another one or more intermediary values until the input current limit reaches another predetermined value.

9. The reception device of claim 1, wherein when the event for changing the input current limit of the charger corresponds to switching of a charging mode of the battery from a Constant Current (CC) mode to a Constant Voltage (CV) mode, the control circuit is configured to adjust the input current limit of the charger to have a preset offset from the output current of the charger.

10. The reception device of claim 1, wherein when the event for changing the input current limit of the charger corresponds to switching of a charging mode of the battery from a Constant Current (CC) mode to a Constant Voltage (CV) mode, and when a temperature in at least one part of the reception device exceeds a threshold value, the control circuit is configured to adjust the input current limit of the charger to have a preset offset from the output current of the charger.

11. The reception device of claim 1, wherein when the event for changing the input current limit of the charger corresponds to a request for executing an application of the reception device or a request for terminating the application, the control circuit is configured to:

gradually increase the input current limit of the charger by stepping up the input current limit to the one or more intermediary values until the input current limit reaches the predetermined value when the request for executing the application is detected; and

gradually decrease the input current limit of the charger by stepping down the input current limit to another one or more intermediary values until the input current limit reaches another predetermined value when the request for terminating the application is detected.

12. The reception device of claim 11, wherein when a size of an expected current change according to the execution or the termination of the application exceeds a preset threshold, the control circuit is configured to gradually change the input current limit of the charger.

13. The reception device of claim 1, wherein when the event for changing the input current limit of the charger corresponds to a request for a quick charge operation of the battery, the control circuit is configured to gradually increase the input current limit of the charger by stepping up the input current limit to the one or more intermediary values until the input current limit reaches the predetermined value.

14. The reception device of claim 13, wherein when a request for terminating the quick charge operation is detected, the control circuit is configured to gradually decrease the input current limit of the charger by stepping down the input current limit to another one or more intermediary values until the input current limit reaches another predetermined value in accordance with a normal charging mode.

15. A method of controlling a reception device for receiving wireless power, the method comprising:

wirelessly receiving power from a transmission device, and rectifying and outputting the received power;

processing the rectified power to charge a battery of the reception device or outputting the rectified power to a system of the reception device; and

when an event for changing an input current limit of a charger is detected, gradually changing the input current limit of the charger by stepping up or stepping down the input current limit to one or more intermediary values until the input current limit reaches a predetermined value,

wherein when the event for changing the input current limit of the charger corresponds to a change of an input current of the charger over a first time period that causes a disconnection between the reception device and the transmission device, the input current of the charger is gradually changed over a second time period longer than the first time period, such that connection between the reception device and the transmission device is maintained.

16. The method of claim 15, wherein the input current limit of the charger is gradually changed when a requested amount of a change in the input current limit of the charger is larger than a preset threshold value.

17. The method of claim 15, wherein when the event for changing the input current limit of the charger corresponds to a request for decreasing an output current of the charger, the method further comprises:

gradually decreasing the input current limit of the charger by stepping down the input current limit to the one or more intermediary values until the input current limit reaches the predetermined value; and

decreasing a setting value of the output current of the charger after the decreasing of the input current limit of the charger is finished.

18. The method of claim 15, wherein when the event for changing the input current limit of the charger corresponds to a request for increasing an output current of the charger, the method further comprises:

increasing a setting value of the output current of the charger; and

after the setting value of the output current of the charger is increased, gradually increasing the input current limit of the charger by stepping up the input current limit to the one or more intermediary values until the input current limit reaches the predetermined value.

19. The method of claim 15, wherein when the event for changing the input current limit of the charger corresponds to a detection of a full charge of the battery, the method further comprises decreasing the input current limit of the charger to a preset value.

20. The method of claim 19, wherein when re-initiation of charging of the battery is requested, the method further comprises increasing the input current limit of the charger.

21. The method of claim 15, wherein the input current limit of the charger is gradually decreased when the event for changing the input current limit of the charger corresponds to detection of output voltage change information from the transmission device.

22. The method of claim 21, further comprising:

after the output voltage change by the transmission device is complete, gradually re-adjusting the input current limit of the charger by stepping up the input current limit to another one or more intermediary values until the input current limit reaches another predetermined value.

23. The method of claim 15, wherein when the event for changing the input current limit of the charger corresponds to switching of a charging mode of the battery from a Constant Current (CC) mode to a Constant Voltage (CV) mode, the method further comprises adjusting the input current limit of the charger to have a preset offset from the output current of the charger.

24. The method of claim 15, wherein when the event for changing the input current limit of the charger corresponds to switching of a charging mode of the battery from a Constant Current (CC) mode to a Constant Voltage (CV) mode, and when a temperature in at least one part of the reception device exceeds a threshold value, the method further comprises adjusting the input current limit of the charger to have a preset offset from the output current of the charger.

25. The method of claim 15, wherein when the event for changing the input current limit of the charger corresponds to a request for executing an application of the reception device or a request for terminating the application, the method further comprises:

gradually increasing the input current limit of the charger by stepping up the input current limit to the one or more intermediary values until the input current limit reaches the predetermined value when the request for executing the application is detected; and

gradually decreasing the input current limit of the charger by stepping down the input current limit to another one or more intermediary values until the input current limit reaches another predetermined value when the request for terminating the application is detected.

26. The method of claim 25, wherein the input current limit of the charger is gradually changed when a size of an expected current change according to the execution or the termination of the application exceeds a preset threshold.

27. The method of claim 15, wherein when the event for changing the input current limit of the charger corresponds to a request for a quick charge operation of the battery, the method further comprises gradually increasing the input current limit of the charger by stepping up the input current limit to the one or more intermediary values until the input current limit reaches the predetermined value.

28. The method of claim 27, wherein when a request for terminating the quick charge operation is detected, the method further comprises gradually decreasing the input current limit of the charger by stepping down the input current limit to another one or more intermediary values until the input current limit reaches another predetermined value in accordance with a normal charging mode.

29. A reception device for receiving wireless power, the reception device comprising:

a power reception circuit configured to wirelessly receive power from a transmission device, and rectify and output the received power;

a charger configured to process the rectified power received from the power reception circuit and charge a battery of the reception device or output the power to a system of the reception device;

a temperature sensor; and

a control circuit configured to, when a temperature sensed by the temperature sensor exceeds a preset threshold value, control to increase an output voltage of the power reception circuit to a preset value.

30. A reception device for receiving wireless power, the reception device comprising:

a power reception circuit configured to wirelessly receive power from a transmission device and comprising a rectifier to rectify the received power;

a charger configured to process the rectified power received from the power reception circuit and charge a battery of the reception device or output the power to a system of the reception device; and

a control circuit configured to set a headroom value between an output voltage of the rectifier and an output voltage of the power reception circuit as a first value for a first period during which the reception device is recognized by the transmission device and set the headroom value as a second value for a second period during which the reception device wirelessly receives the power from the transmission device.

31. The reception device of claim 30, wherein when switching of a charging mode of the charger from a Constant Current (CC) mode to a Constant Voltage (CV) mode is detected, the control circuit is configured to change the headroom from the second value to the first value.

32. A reception device for receiving wireless power, the reception device comprising:

a power reception circuit configured to wirelessly receive power from a transmission device and comprising a rectifier to rectify the received power;

a communication module;

a charger configured to process the rectified power received from the power reception circuit and charge a battery of the reception device or output the power to a system of the reception device; and

a control circuit configured to, when switching of a charging mode of the charger from a Constant Current (CC) mode to a Constant Voltage (CV) mode is detected, control the communication module to transmit a request for resetting a foreign material detection setting value to the transmission device.