Charging apparatus

• US 9,450,444 B2
• Filed: 08/13/2013
• Issued: 09/20/2016
• Est. Priority Date: 03/07/2008
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Tanabe, Akihiro
• Primary Examiner(s): Fantu, Yalkew
• Application Number:
  US13/965,359
• Publication Number:
  US 20130328411A1
• Time in Patent Office: 1,134 Days
• Field of Search: 320/108
• US Class Current: 1/1
• 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 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

A charging apparatus includes: a charging unit configured to perform a contactless charging operation for a placed external device; a detector configured to detect a position of a placed object; a determining unit configured to determine that the placed object is an external device compatible with the charging unit; and a control unit configured to control the charging unit such that, during the contactless charging operation for an external device compatible with the charging unit, the charging operation for the external device being charged is restricted when an object that is determined by the determining unit not to be an external device compatible with the charging unit, has been placed within a predetermined distance from the charging unit.

Claims

1. A power transmission apparatus comprising:

a communication unit that communicates with an external device to receive information that is used to determine whether the external device is a chargeable device;

a power transmission unit that performs a first process that includes a process for transmitting power wirelessly to the external device;

a control unit that (a) performs a second process that includes a process for detecting a foreign object while the first process is performed, and (b) performs a third process after a foreign object is detected in the second process, wherein the third process includes a process for reducing power transmitted wirelessly from the power transmission unit; and

a temperature detection unit that detects a temperature, wherein, if a temperature detected by the temperature detection unit when the third process is performed is equal to or more than a predetermined temperature, the control unit performs a fourth process that includes a process for reducing power transmitted wirelessly from the power transmission unit.

2. The power transmission apparatus according to claim 1, wherein the control unit uses the communication unit to perform the second process.

3. The power transmission apparatus according to claim 1, further comprising an output unit that outputs information relating to a detected foreign object.

4. The power transmission apparatus according to claim 1, wherein the control unit determines whether to perform a process for stopping transmitting power wirelessly from the power transmission unit, after the fourth process is performed.

5. The power transmission apparatus according to claim 1, wherein, if a temperature detected by the temperature detection unit when the fourth process is performed is equal to or more than a predetermined temperature, the control unit performs a process for stopping transmitting power wirelessly from the power transmission unit.

6. The power transmission apparatus according to claim 1, wherein the control unit uses the communication unit to perform the second process, and wherein the second process includes a process for determining whether or not an object, which is different from the external device, is a foreign object.

7. The power transmission apparatus according to claim 1, wherein the power transmission unit uses electromagnetic induction to transmit power wirelessly.

8. The power transmission apparatus according to claim 1, wherein the power transmission unit transmits power via an antenna.

9. The power transmission apparatus according to claim 1, wherein the power transmission unit transmits power wirelessly via a resonant circuit.

10. The power transmission apparatus according to claim 1, wherein the third process includes a process for reducing power transmitted wirelessly near to a foreign object.

11. A method comprising:

causing a communication unit to communicate with an external device to receive information that is used to determine whether the external device is a chargeable device;

causing a power transmission unit to perform a first process that includes a process for transmitting power wirelessly from the power transmission unit to the external device;

performing a second process that includes a process for detecting a foreign object while the first process is performed;

performing a third process after a foreign object is detected in the second process, wherein the third process includes a process for reducing power transmitted wirelessly from the power transmission unit;

causing a temperature detection unit to detect a temperature; and

if a temperature detected by the temperature detection unit when the third process is performed is equal to or more than a predetermined temperature, performing a fourth process that includes a process for reducing power transmitted wirelessly from the power transmission unit.

23. The method according to claim 11, wherein the communication unit is used to perform the second process.

24. The method according to claim 11, further comprising causing an output unit to output information relating to a detected foreign object.

25. The method according to claim 11, further comprising determining whether to perform a process for stopping transmitting power wirelessly from the power transmission unit, after the fourth process is performed.

26. The method according to claim 11, further comprising

if a temperature detected by the temperature detection unit when the fourth process is performed is equal to or more than a predetermined temperature, performing a process for stopping transmitting power wirelessly from the power transmission unit.

27. The method according to claim 11,

wherein the communication unit is used to perform the second process, and

wherein the second process includes a process for determining whether or not an object, which is different from the external device, is a foreign object.

28. The method according to claim 11, wherein the power transmission unit uses electromagnetic induction to transmit power wirelessly.

29. The method according to claim 11, wherein the power transmission unit transmits power via an antenna.

30. The method according to claim 11, wherein the power transmission unit transmits power wirelessly via a resonant circuit.

31. The method according to claim 11, wherein the third process includes a process for reducing power transmitted wirelessly near to a foreign object.

12. A power transmission apparatus comprising:

a communication unit that communicates with an external device to receive information that is used to determine whether the external device is a chargeable device;

a power transmission unit that performs a first process that includes a process for transmitting power wirelessly to the external device;

a control unit that (a) performs a second process that includes a process for detecting a foreign object while the first process is performed, and (b) performs a third process after a foreign object is detected in the second process, wherein the third process includes a process for restricting power transmitted wirelessly from the power transmission unit; and

a temperature detection unit that detects a temperature, wherein, if a temperature detected by the temperature detection unit when the third process is performed is equal to or more than a predetermined temperature, the control unit performs a fourth process that includes a process for restricting power transmitted wirelessly from the power transmission unit.

13. The power transmission apparatus according to claim 12, wherein the control unit uses the communication unit to perform the second process.

14. The power transmission apparatus according to claim 12, further comprising an output unit that outputs information relating to a detected foreign object.

15. The power transmission apparatus according to claim 12, wherein the control unit determines whether to perform a process for stopping transmitting power wirelessly from the power transmission unit, after the fourth process is performed.

16. The power transmission apparatus according to claim 12, wherein, if a temperature detected by the temperature detection unit when the fourth process is performed is equal to or more than a predetermined temperature, the control unit performs a process for stopping transmitting power wirelessly from the power transmission unit.

17. The power transmission apparatus according to claim 12, wherein the control unit uses the communication unit to perform the second process, and wherein the second process includes a process for determining whether or not an object, which is different from the external device, is a foreign object.

18. The power transmission apparatus according to claim 12, wherein the power transmission unit uses electromagnetic induction to transmit power wirelessly.

19. The power transmission apparatus according to claim 12, wherein the power transmission unit transmits power via an antenna.

20. The power transmission apparatus according to claim 12, wherein the power transmission unit transmits power wirelessly via a resonant circuit.

21. The power transmission apparatus according to claim 12, wherein the third process includes a process for restricting power transmitted wirelessly near to a foreign object.

22. A method comprising causing a communication unit to communicate with an external device to receive information that is used to determine whether the external device is a chargeable device;

causing a power transmission unit to perform a first process that includes a process for transmitting power wirelessly from the power transmission unit to the external device;

performing a second process that includes a process for detecting a foreign object while the first process is performed;

performing a third process after a foreign object is detected in the second process, wherein the third process includes a process for restricting power transmitted wirelessly from the power transmission unit;

causing a temperature detection unit to detect a temperature; and

if a temperature detected by the temperature detection unit when the third process is performed is equal to or more than a predetermined temperature, performing a fourth process that includes a process for restricting power transmitted wirelessly from the power transmission unit.

32. The method according to claim 22, wherein the communication unit is used to perform the second process.

33. The method according to claim 22, further comprising causing an output unit to output information relating to a detected foreign object.

34. The method according to claim 22, further comprising determining whether to perform a process for stopping transmitting power wirelessly from the power transmission unit, after the fourth process is performed.

35. The method according to claim 22, further comprising

if a temperature detected by the temperature detection unit when the fourth process is performed is equal to or more than a predetermined temperature, performing a process for stopping transmitting power wirelessly from the power transmission unit.

36. The method according to claim 22,

wherein the communication unit is used to perform the second process, and

wherein the second process includes a process for determining whether or not an object, which is different from the external device, is a foreign object.

37. The method according to claim 22, wherein the power transmission unit uses electromagnetic induction to transmit power wirelessly.

38. The method according to claim 22, wherein the power transmission unit transmits power via an antenna.

39. The method according to claim 22, wherein the power transmission unit transmits power wirelessly via a resonant circuit.

40. The method according to claim 22, wherein the third process includes a process for restricting power transmitted wirelessly near to a foreign object.