POWER ADAPTER AND MOBILE TERMINAL

• US 20170093189A1
• Filed: 12/14/2016
• Published: 03/30/2017
• Est. Priority Date: 05/13/2015
• Status: Active Grant

• Current Assignee: Guangdong OPPO Mobile Telecommunications Corporation Limited
• Original Assignee: Guangdong OPPO Mobile Telecommunications Corporation Limited
• Inventors: ZENG, Yuanqing
• Granted Patent: US 10,424,953 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• 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 7/0044 specially adapted for holding portable devices containing batteries H02J7/0045 takes precedence
• CPC Class Codes: H02J 7/0068 Battery or charger load switching, e.g. concurrent charging and load supply H02J7/0013 takes precedence
• CPC Class Codes: H02J 7/007 Regulation of charging or discharging current or voltage
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage
• CPC Class Codes: H04M 19/08 with current supply sources at the substations generating ringing current H04M19/04
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

The present disclosure provides a power adapter and a terminal. The power adapter is coupled to a mobile terminal via a USB interface, and a data line of the USB interface is used for a bidirectional communication between the power adapter and the mobile terminal. The power adapter supports a normal charging mode and a quick charging mode, and a charging current of the quick charging mode is greater than a charging current of the normal charging mode. The method includes: communicating, by the power adapter, with the mobile terminal via the data line of the USB interface, so as to determine to charge the mobile terminal in the quick charging mode; and adjusting, by the power adapter, a charging current of the power adapter to be the charging current of the quick charging mode to charge the mobile terminal.

Claims

1. A power adapter, the power adapter being coupled to a mobile terminal via a Universal Serial Bus (USB) interface, a power line of the USB interface being used for the power adapter to charge the mobile terminal, a data line of the USB interface being used for a bidirectional communication between the power adapter and the mobile terminal, the power adapter supporting a normal charging mode and a quick charging mode, a charging current of the quick charging mode being greater than a charging current of the normal charging mode, the power adapter comprising:

a communication circuit configured to communicate with the mobile terminal bidirectionally via the data line of the USB interface, so as to determine whether to charge the mobile terminal in the quick charging mode; and

a current adjusting circuit configured to adjust a charging current of the power adapter to be the charging current of the quick charging mode to charge the mobile terminal.

2. The power adapter of claim 1, wherein the communication circuit is configured to transmit a first instruction to the mobile terminal, and the first instruction is configured to query the mobile terminal for whether to activate the quick charging mode;

and the communication circuit is further configured to receive a reply instruction for the first instruction from the mobile terminal, and the reply instruction for the first instruction is configured to indicate that the mobile terminal agrees to activate the quick charging mode.

3. The power adapter of claim 2, wherein the power adapter further comprises:

a power conversion circuit configured to charge the mobile terminal in the normal charging mode;

the communication circuit is configured to transmit the first instruction to the mobile terminal when it is determined that a time length of using the normal charging mode for charging is greater than a preset threshold.

4. The power adapter of claim 1, wherein the communication circuit is further configured to communicate with the mobile terminal bidirectionally via the data line of the USB interface to determine a charging voltage of the quick charging mode;

the power adapter further comprises;

a voltage adjusting circuit configured to adjust a charging voltage of the power adapter to be the charging voltage of the quick charging mode.

5. The power adapter of claim 4, wherein the communication circuit is further configured to transmit a second instruction to the mobile terminal, and the second instruction is configured to query whether a current voltage of the power adapter is proper to be the charging voltage of the quick charging mode;

and the communication circuit is further configured to receive a reply instruction for the second instruction from the mobile terminal, and the reply instruction for the second instruction is configured to indicate that the current voltage of the power adapter is proper, high, or low;

the voltage adjusting circuit is configured to determine the charging voltage of the quick charging mode according to the reply instruction for the second instruction.

6. The power adapter of claim 1, wherein the communication circuit is configured to communicate with the mobile terminal bidirectionally via the data line of the USB interface to determine the charging current of the quick charging mode;

the communication circuit is configured to transmit a third instruction to the mobile terminal, and the third instruction is configured to query a maximum charging current which is currently supported by the mobile terminal;

the communication circuit is further configured to receive a reply instruction for the third instruction from the mobile terminal, and the reply instruction for the third instruction is configured to indicate the maximum charging current which is currently supported by the mobile terminal; and

the communication circuit is further configured to determine the charging current of the quick charging mode according to the reply instruction for the third instruction.

7. The power adapter of claim 1, wherein the communication circuit is further configured to communicate with the mobile terminal bidirectionally via the data line of the USB interface during the process that the power adapter charges the mobile terminal in the quick charging mode to constantly adjust the charging current of the power adapter.

8. The power adapter of claim 7, wherein the communication circuit is configured to transmit a fourth instruction to the mobile terminal, and the fourth instruction is configured to query a current voltage of a battery of the mobile terminal;

and the communication circuit is further configured to receive a reply instruction for the fourth instruction from the mobile terminal, and the reply instruction for the fourth instruction is configured to indicate the current voltage of the battery of the mobile terminal;

the current adjusting circuit is configured to adjust the charging current of the power adapter according to be the current voltage of the battery.

9. The power adapter of claim 8, wherein the current adjusting circuit is configured to adjust the charging current of the power adapter to be a charging current of the current voltage of the battery according to the current voltage of the battery, and a preset corresponding relationship between battery voltage values and charging current values.

10. The power adapter of claim 9, wherein the communication circuit is configured to receive information for indicating path impedance of the mobile terminal from the mobile terminal, receive a reply instruction for the fourth instruction from the mobile terminal, and the reply instruction for the fourth instruction is configured to indicate the voltage of the battery of the mobile terminal;

the communication circuit is configured to determine path impedance from the power adapter to the battery according to the charging voltage of the power adapter and the voltage of the battery, and determine whether the USB interface is in bad contact according to the path impedance from the power adapter to the battery, the path impedance of the mobile terminal, and path impedance of a charging circuit between the power adapter and the mobile terminal.

11. A mobile terminal, the mobile terminal being coupled to a power adapter via a Universal Serial Bus (USB) interface, a power line of the USB interface being used for charging the mobile terminal, a data line of the USB interface being used for a bidirectional communication between the mobile terminal and the power adapter, the mobile terminal supporting a normal charging mode and a quick charging mode, a charging current of the quick charging mode being greater than a charging current of the normal charging mode, the mobile terminal comprising:

a communication circuit configured to communicate with the power adapter bidirectionally via the data line of the USB interface, so as to cause the power adapter to determine to charge the mobile terminal in the quick charging mode; and

a charging circuit configured to receive the charging current of the quick charging mode from the power adapter to charge a battery of the mobile terminal.

12. The mobile terminal of claim 11, wherein the communication circuit is configured to receive a first instruction from the power adapter, and the first instruction is configured to query the mobile terminal for whether to activate the quick charging mode;

and the communication circuit is further configured to transmit a reply instruction for the first instruction to the power adapter, and the reply instruction for the first instruction is configured to indicate that the mobile terminal agrees to activate the quick charging mode.

13. The mobile terminal of claim 12, wherein the charging circuit is further configured to cause the power adapter to charge the mobile terminal in the normal charging mode;

the communication circuit is configured to receive the first instruction from the power adapter when the power adapter determines that a time length of using the normal charging mode for charging is greater than a preset threshold.

14. The mobile terminal of claim 11, wherein the communication circuit is further configured to communicate with the power adapter bidirectionally via the data line of the USB interface to cause the power adapter to determine a charging voltage of the quick charging mode.

15. The mobile terminal of claim 14, wherein the communication circuit is configured to receive a second instruction from the power adapter, and the second instruction is configured to query whether a current voltage of the power adapter is proper to be the charging voltage of the quick charging mode;

the communication circuit is further configured to transmit a reply instruction for the second instruction to the power adapter, wherein the reply instruction for the second instruction is configured to indicate that the current voltage of the power adapter is proper, high, or low.

16. The mobile terminal of claim 11, wherein the communication circuit is further configured to communicate with the power adapter bidirectionally via the data line of the USB interface to cause the power adapter to determine the charging current of the quick charging mode.

17. The mobile terminal of claim 16, wherein the communication circuit is configured to receive a third instruction from the power adapter, and the third instruction is configured to query a maximum charging current which is currently supported by the mobile terminal;

and the communication circuit is further configured to transmit a reply instruction for the third instruction to the power adapter, and the reply instruction for the third instruction is configured to indicate the maximum charging current which is currently supported by the mobile terminal, so as to cause the power adapter to determine the charging current of the quick charging mode according to the maximum charging current.

18. The mobile terminal of claim 11, wherein the communication circuit is further configured to communicate with the power adapter bidirectionally via the data line of the USB interface during the process that the power adapter charges the mobile terminal in the quick charging mode, so as to cause the power adapter to constantly adjust the charging current of the power adapter.

19. The mobile terminal of claim 18, wherein the communication circuit is configured to receive a fourth instruction from the power adapter, and the fourth instruction is configured to query a current voltage of the battery of the mobile terminal;

and the communication circuit is further configured to transmit a reply instruction for the fourth instruction to the power adapter, and the reply instruction for the fourth instruction is configured to indicate the current voltage of the battery of the mobile terminal, so as to cause the power adapter to constantly adjust the charging current of the power adapter according to the current voltage of the battery.

20. The mobile terminal of claim 11, wherein the communication circuit is further configured to communicate with the power adapter bidirectionally via the data line of the USB interface during the process that the power adapter charges the mobile terminal in the quick charging mode to cause the power adapter to determine whether the USB interface is in bad contact;

the communication circuit is configured to receive a fourth instruction from the power adapter, and the fourth instruction is configured to query a current voltage of the battery of the mobile terminal;

the communication circuit is further configured to transmit a reply instruction for the fourth instruction to the power adapter, and the reply instruction for the fourth instruction is configured to indicate the current voltage of the battery of the mobile terminal, so as to cause the power adapter to determine whether the USB interface is in bad contact according to a charging voltage of the power adapter and the current voltage of the battery.

21. A power adapter, the power adapter being coupled to a mobile terminal via a Universal Serial Bus (USB) interface, a power line of the USB interface being used for the power adapter to charge the mobile terminal, a data line of the USB interface being used for a bidirectional communication between the power adapter and the mobile terminal, the power adapter supporting a normal charging mode and a quick charging mode, and a charging current of the quick charging mode being greater than a charging current of the normal charging mode, the power adapter comprising:

a charging circuit; and

a communication control circuit configured to determine to activate the quick charging mode, conduct a handshake communication with the mobile terminal via a second instruction to determine a charging voltage of the quick charging mode, conduct a handshake communication with the mobile terminal via a third instruction to determine the charging current of the quick charging mode, adjust an output voltage and an output current of the power adapter to be the charging voltage of the quick charging mode and the charging current of the quick charging mode respectively to enter a constant current phase, and conduct a handshake communication with the mobile terminal via a fourth instruction during the constant current phase to adjust the output current of the power adapter, so as to charge the mobile terminal in a multi-stage constant current mode via the charging circuit.

22. The power adapter of claim 21, wherein the communication control circuit is configured to conduct a handshake communication with the mobile terminal via a first instruction to determine to activate the quick charging mode.

23. The power adapter of claim 22, wherein the communication control circuit is configured to transmit the first instruction to the mobile terminal, and the first instruction is configured to query the mobile terminal for whether to activate the quick charging mode, the communication control circuit is further configured to receive a reply instruction for the first instruction from the mobile terminal, and determine to activate the quick charging mode when the reply instruction for the first instruction indicates that the mobile terminal agrees to activate the quick charging mode.

24. The power adapter of claim 23, wherein the reply instruction for the first instruction comprises impedance information for indicating path impedance of the mobile terminal, and the impedance information is used for the power adapter to determine whether the USB interface is in bad contact during the constant current phase.

25. The power adapter of claim 23, wherein the communication control circuit is further configured to determine that the mobile terminal has recognized a type of the power adapter when the power adapter determines that within a preset time length a charging current provided to the mobile terminal by the power adapter is greater than or equal to a preset current threshold during the process that the power adapter is coupled to the mobile terminal, and transmit the first instruction to the mobile terminal when the power adapter determines that the mobile terminal has recognized the type of the power adapter.

26. The power adapter of claim 25, wherein when the reply instruction for the first instruction indicates that the mobile terminal disagrees to activate the quick charging mode, the communication control circuit is further configured to repeat the above process of detecting the charging current and the handshake communication based on the first instruction until the mobile terminal agrees to activate the quick charging mode or the charging current is less than the preset current threshold.

27. The power adapter of claim 21, wherein the communication control circuit is configured to receive a query message from the mobile terminal, and the query message is configured to query whether the power adapter supports the quick charging mode, the communication control circuit is further configured to transmit a response message to mobile terminal, and the response message is configured to indicate that the power adapter supports the quick charging mode, the communication control circuit is further configured to receive an indication message from the mobile terminal, and the indication message is configured to instruct the power adapter to activate the quick charging mode.

28. The power adapter of claim 21, wherein the communication control circuit is configured to transmit a second instruction to the mobile terminal, and the second instruction is configured to query whether a current output voltage of the power adapter is proper to be the charging voltage of the quick charging mode, the communication control circuit is further configured to receive a reply instruction for the second instruction from the mobile terminal, and the reply instruction for the second instruction is configured to indicate that the current output voltage of the power adapter is proper, high, or low, the communication control circuit is further configured to determine the current output voltage of the power adapter as the charging voltage of the quick charging mode when the reply instruction for the second instruction indicates that the current output voltage of the power adapter is proper, and when the reply instruction for the second instruction indicates that the current output voltage of the power adapter is high or low, the communication control circuit is further configured to adjust the current output voltage of the power adapter according to the reply instruction for the second instruction, and repeat the handshake communication based on the second instruction to constantly adjust the current output voltage of the power adapter until the reply instruction for the second instruction indicates that the current output voltage of the power adapter is proper.

29. The power adapter of claim 28, wherein the communication control circuit is further configured to determine a time length of the handshake communication based on the second instruction, and when the time length is greater than a preset time length threshold, the communication control circuit is further configured to determine that the handshake communication based on the second instruction is abnormal, exit the handshake communication of the quick charging mode, or redetermine whether to activate the quick charging mode.

30. The power adapter of claim 21, wherein the communication control circuit is configured to transmit a third instruction to the mobile terminal, and the third instruction is configured to query a maximum charging current which is currently supported by the mobile terminal, the communication control circuit is further configured to receive a reply instruction for the third instruction from the mobile terminal, and the reply instruction for the third instruction is configured to indicate the maximum charging current which is currently supported by the mobile terminal, the communication control circuit is further configured to determine the charging current of the quick charging mode according to the reply instruction for the third instruction.

31. The power adapter of claim 21, wherein the communication control circuit is configured to adjust the output current of the power adapter to be the charging current of the quick charging mode by controlling speed for adjusting current, and the speed for adjusting current is within a preset speed range for adjusting current.

32. The power adapter of claim 21, wherein the communication control circuit is configured to transmit the fourth instruction to the mobile terminal during the constant current phase, and the fourth instruction is configured to query a current voltage of a battery of the mobile terminal, the communication control circuit is further configured to receive a reply instruction for the fourth instruction from the mobile terminal, and the reply instruction for the fourth instruction is configured to indicate the current voltage of the battery of the mobile terminal, the communication control circuit is further configured to adjust the output current of the power adapter according to the current voltage of the battery.

33. The power adapter of claim 32, wherein the communication control circuit is configured to transmit the fourth instruction to the mobile terminal every a preset time interval during the constant current phase.

34. The power adapter of claim 32, wherein the communication control circuit is further configured to receive impedance information for indicating path impedance of the mobile terminal from the mobile terminal, determine an impedance of a charging circuit from the power adapter to the battery according to the current output voltage of the power adapter and the current voltage of the battery during the constant current phase, determine whether the USB interface is in bad contact according to the impedance of the charging circuit from the power adapter to the battery, the path impedance of the mobile terminal, and path impedance of a charging circuit between the power adapter and the mobile terminal, and exit the quick charging mode or redetermine whether to activate the quick charging mode when the USB interface is in bad contact.

35. The power adapter of claim 34, wherein the communication control circuit is further configured to transmit a fifth instruction to the mobile terminal when the USB interface is in bad contact, and the fifth instruction is configured to indicate that the USB interface is in bad contact and the power adapter is ready to exit the quick charging mode or redetermine whether to activate the quick charging mode.

36. The power adapter of claim 21, wherein during the constant current phase, a communication time interval between the power adapter and the mobile terminal is less than a preset time interval threshold, otherwise the power adapter exits the quick charging mode or redetermines whether to activate the quick charging mode.

37. The power adapter of claim 21, wherein stop of the quick charging mode comprises two stop modes:

a recoverable stop mode and a non-recoverable stop mode, in the recoverable stop mode, the power adapter or the mobile terminal again activates the quick charging mode, and the power adapter again conducts the handshake communication with the mobile terminal, in the non-recoverable stop mode, the power adapter or the mobile terminal does not activate the quick charging mode again, and the power adapter charges the mobile terminal in the normal charging mode, or does not charge the mobile terminal again.

38. The power adapter of claim 37, wherein a condition suitable for the recoverable stop mode comprises:

when a communication fault occurs between the power adapter and the mobile terminal, or a battery of the mobile terminal becomes abnormal, the quick charging mode is stopped, the power adapter requeries whether the mobile terminal agrees to activate the quick charging mode, and the mobile terminal agrees to again activate the quick charging mode;

or

a condition suitable for the non-recoverable stop mode comprises;

when the battery of the mobile terminal is fully charged or the USB interface is in bad contact, the power adapter requeries the mobile terminal for whether to agree to activate the quick charging mode, and the mobile terminal disagrees to activate the quick charging mode.

39. The power adapter of claim 21, wherein the communication control circuit is further configured to determine whether the data line of the USB interface of the power adapter and the mobile terminal is the data line which is able to support the quick charging mode.

40. The power adapter of claim 21, wherein during the process of the communication between the power adapter and the mobile terminal, the power adapter is used as a host device to provide clock signal for synchronization between the power adapter and the mobile terminal.

41. A mobile terminal, the mobile terminal being coupled to a power adapter via a Universal Serial Bus (USB) interface, a power line of the USB interface being used for charging the mobile terminal, a data line of the USB interface being used for a bidirectional communication between the mobile terminal and the power adapter, the mobile terminal supporting a normal charging mode and a quick charging mode, and a charging current of the quick charging mode being greater than a charging current of the normal charging mode, the mobile terminal comprising:

a charging circuit; and

a communication control circuit configured to determine to activate the quick charging mode, conduct a handshake communication with the power adapter via a second instruction to determine a charging voltage of the quick charging mode, conduct a handshake communication with the mobile terminal via a third instruction to determine the charging current of the quick charging mode, and conduct a handshake communication with the power adapter via a fourth instruction when the power adapter adjusts an output voltage and an output current of the power adapter to be the charging voltage of the quick charging mode and the charging current of the quick charging mode respectively and enters a constant current phase, so as to cause the power adapter to adjust the output current to charge the mobile terminal in a multi-stage constant current mode via the charging circuit.

42. The mobile terminal of claim 41, wherein the communication control circuit is configured to conduct a handshake communication with the power adapter via a first instruction to determine to activate the quick charging mode.

43. The mobile terminal of claim 42, wherein the communication control circuit is configured to receive the first instruction from the power adapter, and the first instruction is configured to query the mobile terminal for whether to activate the quick charging mode, and the communication control circuit is further configured to transmit a reply instruction for the first instruction to the power adapter, and the reply instruction for the first instruction indicates that the mobile terminal agrees to activate the quick charging mode.

44. The mobile terminal of claim 43, wherein the reply instruction for the first instruction comprises impedance information for indicating path impedance of the mobile terminal, and the impedance information is used for the power adapter to determine whether the USB interface is in bad contact during the constant current phase.

45. The mobile terminal of claim 43, wherein the communication control circuit is further configured to detect a type of the power adapter via a D+ data line and a D−

data line of the USB interface during a process that the mobile terminal is coupled to the power adapter, and receive a charging current from the power adapter, and the charging current is greater than or equal to a preset current threshold, and the communication control circuit is further configured to receive the first instruction from the power adapter when the power adapter determines that within a preset time length the charging current provided to the mobile terminal by the power adapter is greater than or equal to the preset current threshold.

46. The mobile terminal of claim 41, wherein the communication control circuit is configured to transmit a query message to the power adapter, and the query message is configured to query whether the power adapter supports the quick charging mode, the communication control circuit is further configured to receive a response message from the power adapter, and the response message is configured to indicate that the power adapter supports the quick charging mode;

and the communication control circuit is further configured to transmit an indication message to the power adapter, wherein the indication message is configured to instruct the power adapter to activate the quick charging mode.

47. The mobile terminal of claim 41, wherein the communication control circuit is configured to receive the second instruction from the power adapter, and the second instruction is configured to query whether a current output voltage of the power adapter is proper to be the charging voltage of the quick charging mode, the communication control circuit is further configured to transmit a reply instruction for the second instruction to the power adapter, and the reply instruction for the second instruction is configured to indicate that the current output voltage of the power adapter is proper, high, or low, so as to cause the power adapter to determine the charging voltage of the quick charging mode according to the reply instruction for the second instruction.

48. The mobile terminal of claim 47, wherein the communication control circuit is configured to transmit the reply instruction for the second instruction to the power adapter when the mobile terminal determines that the current output voltage of the power adapter is greater than the voltage of the battery of the mobile terminal and a voltage difference between the current output voltage of the power adapter and the voltage of the battery is within a preset voltage difference threshold range, and the reply instruction for the second instruction is configured to indicate that the current output voltage of the power adapter is proper.

49. The mobile terminal of claim 41, wherein the communication control circuit is further configured to determine a time length of the handshake communication based on the second instruction, and when the time length is greater than a preset time length threshold, the communication control circuit is further configured to determine that the handshake communication based on the second instruction is abnormal, exit the handshake communication of the quick charging mode, or redetermine whether to activate the quick charging mode.

50. The mobile terminal of claim 41, wherein the communication control circuit is configured to receive a third instruction from the power adapter, and the third instruction is configured to query a maximum charging current which is currently supported by the mobile terminal, the communication control circuit is further configured to transmit a reply instruction for the third instruction to the power adapter, and the reply instruction for the third instruction indicates the maximum charging current which is currently supported by the mobile terminal, so as to cause the power adapter to determine the charging current of the quick charging mode according to the reply instruction for the third instruction.

51. The mobile terminal of claim 41, wherein the communication control circuit is configured to receive a fourth instruction from the power adapter during the constant current phase, and the fourth instruction is configured to query the current voltage of the battery of the mobile terminal, and the communication control circuit is configured to transmit a reply instruction for the fourth instruction to the power adapter, and the reply instruction for the fourth instruction is configured to indicate the current voltage of the battery of the mobile terminal, so as to cause the power adapter to adjust the output current of the power adapter according to the current voltage of the battery.

52. The mobile terminal of claim 51, wherein the communication control circuit is configured to receive the fourth instruction from the power adapter every a preset time interval during the constant current phase.

53. The mobile terminal of claim 51, wherein the communication control circuit is further configured to transmit an information for indicating path impedance of the mobile terminal to the power adapter to cause the power adapter to determine whether the USB interface is in bad contact according to the path impedance during the constant current phase, receive a fifth instruction from the power adapter when the power adapter determines that USB interface is in bad contact, and the fifth instruction is configured to indicate that the USB interface is in bad contact, and the power adapter is ready to exit the quick charging mode or redetermine whether to activate the quick charging mode.

54. The mobile terminal of claim 41, wherein during the constant current phase, a communication time interval between the power adapter and the mobile terminal is less than a preset time interval threshold, otherwise the power adapter exits the quick charging mode or again activate the quick charging mode.

55. The mobile terminal of claim 41, wherein stop of the quick charging mode comprises two stop modes:

a recoverable stop mode and a non-recoverable stop mode, in the recoverable stop mode, the power adapter or the mobile terminal again activates the quick charging mode, and the power adapter again conducts the handshake communication with the mobile terminal, in the non-recoverable stop mode, the power adapter or the mobile terminal does not activate the quick charging mode again, and the power adapter charges the mobile terminal in the normal charging mode, or does not charge the mobile terminal again.

56. The mobile terminal of claim 55, wherein a condition suitable for the recoverable stop mode comprises:

when a communication fault occurs between the power adapter and the mobile terminal, or the battery of the mobile terminal becomes abnormal, the quick charging mode is stopped, the power adapter requeries the mobile terminal for whether to agree to activate the quick charging mode, and the mobile terminal agrees to again activate the quick charging mode;

or

a condition suitable for the non-recoverable stop mode comprises;

when the battery of the mobile terminal is fully charged or the USB interface is in bad contact, the power adapter requeries the mobile terminal for whether to agree to activate the quick charging mode, and the mobile terminal disagrees to activate the quick charging mode.

57. The mobile terminal of claim 41, wherein the communication control circuit is further configured to determine whether the data line of the USB interface of the power adapter and the mobile terminal is the data line which is able to support the quick charging mode.

58. The mobile terminal of claim 41, wherein during the process of the communication between the power adapter and the mobile terminal, the power adapter is used as a host device to provide clock signal for synchronization between the power adapter and the mobile terminal.