Terminal and battery charging control device and method thereof for overcurrent and/or overvoltage protection

• US 10,186,895 B2
• Filed: 08/02/2017
• Issued: 01/22/2019
• Est. Priority Date: 01/28/2014
• Status: Active Grant

• Current Assignee: Guangdong OPPO Mobile Telecommunications Corporation Limited
• Original Assignee: Guangdong OPPO Mobile Telecommunications Corporation Limited
• Inventors: Zhang, Jialiang, Wu, Kewei, Zhang, Jun, Liao, Fuchun, Hu, Yuanxiang
• Primary Examiner(s): Fantu, Yalkew
• Assistant Examiner(s): Sharief, Mohammed J
• Application Number:
  US15/666,881
• Publication Number:
  US 20170358945A1
• Time in Patent Office: 538 Days
• Field of Search: 320107
• 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 7/00302 Overcharge protection
• CPC Class Codes: H02J 7/00304 Overcurrent protection
• CPC Class Codes: H02J 7/00308 Overvoltage protection
• CPC Class Codes: H02J 7/0031 using battery or load disconnect circuits H02J9/002 takes precedence
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

The present disclosure relates to the technical field of charging. A terminal and a battery charging control device and method are provided. The battery charging control device including a battery connector, a main control module and a quick charging switch module is adopted. During the regular charging or the quick charging, the main control module performs a data communication with the external power adapter via the communication interface, and obtains a charging voltage and a charging current for the battery; if the charging voltage is greater than a voltage threshold and/or the charging current is greater than a current threshold, the main control module sends a charging switch-off instruction, such that the controller controls the communication interface to switch off; if the charging voltage is less than or equal to the voltage threshold and the charging current is less than or equal to the current threshold, the main control module continues to obtain the charging voltage and the charging current.

Claims

1. A battery charging control device, configured to be coupled with a battery and a controller in a terminal, the battery being charged by obtaining direct current from an external power adapter via a communication interface of the terminal, the controller controlling the communication interface of the terminal to switch on or off, wherein, the battery charging control device comprises a battery connector, a main control module and a quick charging switch module;

the battery connector is configured to be coupled with an electrode of the battery, the main control module is coupled with the battery connector, a first switch control terminal and a second switch control terminal of the main control module are coupled with a first controlled terminal and a second controlled terminal of the quick charging switch module respectively, both a first communication terminal and a second communication terminal of the main control module are coupled with the communication interface, the main control module is also coupled with the controller, an input terminal of the quick charging switch module is coupled with a power wire of the communication interface, and an output terminal of the quick charging switch module is coupled with the battery connector;

when a regular charging is performed on the battery, the main control module is configured to control the quick charging switch module to switch off;

when a quick charging is performed on the battery, the main control module is configured to control the quick charging switch module to switch on, and the direct current is introduced into the quick charging switch module via the communication interface, so as to charge the battery via the battery connector;

during the regular charging or the quick charging, the main control module is configured to perform a data communication with the external power adapter via the communication interface, and obtains a charging voltage and a charging current for the battery; and

when the charging voltage is greater than a voltage threshold and/or the charging current is greater than a current threshold, the main control module is configured to send a charging switch-off instruction, such that the controller controls the communication interface to switch off;

when the charging voltage is less than or equal to the voltage threshold and the charging current is less than or equal to the current threshold, the main control module is configured to continue to obtain the charging voltage and the charging current;

the main control module is configured to control the quick charging switch module to switch off when receiving a quick charging switch-off instruction indicating an abnormal battery temperature of the battery, when the quick charging is performed on the battery.

2. The battery charging control device according to claim 1, wherein, the main control module comprises a main controller, a thirteenth capacitor and a thirty-sixth resistor;

a first pin and a second pin of the battery connector are commonly grounded, a first ground pin and a second ground pin of the battery connector are commonly grounded, a first input/output pin of the main controller is coupled to a seventh pin and an eighth pin of the battery connector, a second input/output pin is coupled with a sixth pin of the battery connector, a seventh input/output pin is coupled with a fifth pin of the battery connector, an eighth input/output pin is coupled with a fourth pin of the battery connector and a ninth input/output pin of the main controller is coupled with a third pin of the battery connector, both an analog ground pin and a ground pin of the main controller are grounded, both a first vacant pin and a second vacant pin of the main controller are suspended, a power pin of the main controller and a first terminal of the thirteenth capacitor are commonly coupled to the seventh pin and the eighth pin of the battery connector, a fourth input/output pin and an eleventh input/output pin of the main controller are coupled with a controller in the terminal, the thirty-sixth resistor is coupled between the fourth input/output pin and the power pin of the main controller, a fifth input/output pin is configured as the first switch control terminal of the main control module and a tenth input/output pin of the main controller is configured as the second switch control terminal of the main control module, a sixth input/output pin is configured as the first communication terminal of the main control module and a twelfth input/output pin of the main controller is configured as the second communication terminal of the main control module.

3. The battery charging control device according to claim 2, wherein, the main controller is a single chip microcomputer.

4. The battery charging control device according to claim 1, wherein, the quick charging switch module comprises a thirty-seventh resistor, a fourteenth capacitor, a first Schottky diode, a second Schottky diode, a third Schottky diode, a fifteenth capacitor, a thirty-eighth resistor, a thirty-ninth resistor, a fortieth resistor, a third NPN triode, a fourth NMOS transistor and a fifth NMOS transistor;

a first terminal of the fourteenth capacitor is configured as the first controlled terminal of the quick charging switch module, a common node between a first terminal of the thirty-seventh resistor and a first terminal of the thirty-eighth resistor is configured as the second controlled terminal of the quick charging switch module, a second terminal of the thirty-seventh resistor and an anode of the first Schottky diode are commonly coupled to a source of the fourth NMOS transistor, a second terminal of the thirty-eighth resistor is coupled to a base of the third NPN triode, a second terminal of the fourteenth capacitor and a cathode of the first Schottky diode are commonly coupled to an anode of the second Schottky diode, a first terminal of the thirty-ninth resistor and a first terminal of the fifteenth capacitor are commonly coupled to a cathode of the second Schottky diode, each of a second terminal of the thirty-ninth resistor, a first terminal of the fortieth resistor, and a collector of the third NPN triode is coupled to a grid of the fourth NMOS transistor and a gird of the fifth NMOS transistor, a second terminal of the fortieth resistor and a second terminal of the fifteenth capacitor are commonly grounded, the source of the fourth NMOS transistor is configured as the output terminal of the quick charging switch module and coupled with the seventh pin and the eighth pin of the battery connector, a drain of the fourth NMOS transistor is coupled with a drain of the fifth NMOS transistor, a source of the fifth NMOS transistor is configured as the input terminal of the quick charging switch module, an emitter of the third NPN triode is coupled with an anode of the third Schottky diode, and a cathode of the third Schottky diode is grounded.

5. The battery charging control device according to claim 4, wherein, the quick charging switch module further comprises a sixth NMOS transistor, a seventh NMOS transistor and a forty-first resistor;

a source of the sixth NMOS transistor is coupled with the source of the fifth NMOS transistor, a drain of the sixth NMOS transistor is coupled with a drain of the seventh NMOS transistor, a source of the seventh NMOS transistor is coupled with the collector of the third NPN triode, a grid of the sixth NMOS transistor and a grid of the seventh NMOS transistor are commonly coupled to a first terminal of the forty-first resistor, and a second terminal of the forty-first resistor is grounded.

6. The battery charging control device according to claim 5, wherein, when quick charging is performed on the battery, when a power source reversal connection occurs for the communication interface, the direct current is introduced from ground into the second terminal of the forty-first resistor for driving the sixth NMOS transistor and the seventh NMOS transistor to switch off.

7. The battery charging control device according to claim 4, wherein, when the quick charging is performed on the battery, a controller in the terminal is configured to feed back a quick charging switch-off instruction to the main control module at an abnormal battery temperature when the terminal has a function of detecting a temperature of the battery, such that the main control module controls the quick charging switch module to switch off according to the quick charging switch-off instruction.

8. The battery charging control device according to claim 7, wherein, the main controller is configured, when the main control module receives the quick charging switch-off instruction, to output high level voltage according to the quick charging switch-off instruction for turning on the third NPN triode, such that the fourth NMOS transistor and the fifth NMOS transistor are controlled to switch off.

9. The battery charging control device according to claim 4, wherein, the main controller is configured to output high level voltage via a fifth input/output pin of the main controller for controlling the fourth NMOS transistor and the fifth NMOS transistor to switch on, and to control the third NPN triode to switch off via a tenth input/output pin of the main controller, such that the direct current is introduced by the quick charging switch module via the communication interface.

10. A terminal, comprising:

a communication interface, a controller and a battery, wherein, the terminal further comprises a battery charging control device;

wherein the battery charging control device is coupled with a battery and a controller in a terminal;

the battery is charged by obtaining direct current from an external power adapter via a communication interface of the terminal, the controller controls the communication interface of the terminal to switch on or off, and the battery charging control device comprises a battery connector coupled with the battery, a main control module and a quick charging switch module;

the battery connector is coupled with an electrode of the battery, the main control module is coupled with the battery connector, a first switch control terminal and a second switch control terminal of the main control module are coupled with a first controlled terminal and a second controlled terminal of the quick charging switch module respectively, both a first communication terminal and a second communication terminal of the main control module are coupled with the communication interface, the main control module is also coupled with the controller, an input terminal of the quick charging switch module is coupled with a power wire of the communication interface, and an output terminal of the quick charging switch module is coupled with the battery connector;

when a regular charging is performed on the battery, the main control module is configured to control the quick charging switch module to switch off;

when a quick charging is performed on the battery, the main control module is configured to control the quick charging switch module to switch on, and the direct current is introduced into the quick charging switch module via the communication interface, so as to charge the battery via the battery connector;

during the regular charging or the quick charging, the main control module is configured to performs a data communication with the external power adapter via the communication interface, and obtain a charging voltage and a charging current for the battery;

when the charging voltage is greater than a voltage threshold and/or the charging current is greater than a current threshold, the main control module is configured to send a charging switch-off instruction, such that the controller controls the communication interface to switch off;

when the charging voltage is less than or equal to the voltage threshold and the charging current is less than or equal to the current threshold, the main control module is configured to continue to obtain the charging voltage and the charging current;

the main control module is configured to control the quick charging switch module to switch off when receiving a quick charging switch-off instruction indicating an abnormal battery temperature of the battery, when the quick charging is performed on the battery.

11. A battery charging control method, based on a battery charging control device, wherein:

the battery charging control device is coupled with a battery and a controller in a terminal;

the battery is charged by obtaining direct current from an external power adapter via a communication interface of the terminal, the controller controls the communication interface of the terminal to switch on or off, and the battery charging control device comprises a battery connector, a main control module and a quick charging switch module;

the battery connector is coupled with an electrode of the battery, the main control module is coupled with the battery connector, a first switch control terminal and a second switch control terminal of the main control module are coupled with a first controlled terminal and a second controlled terminal of the quick charging switch module respectively, both a first communication terminal and a second communication terminal of the main control module are coupled with the communication interface, the main control module is also coupled with the controller, an input terminal of the quick charging switch module is coupled with a power wire of the communication interface, and an output terminal of the quick charging switch module is coupled with the battery connector;

when a regular charging is performed on the battery, the main control module controls the quick charging switch module to switch off;

when a quick charging is performed on the battery, the main control module controls the quick charging switch module to switch on, and the direct current is introduced into the quick charging switch module via the communication interface, so as to charge the battery via the battery connector;

during the regular charging or the quick charging, the main control module performs a data communication with the external power adapter via the communication interface, and obtains a charging voltage and a charging current for the battery;

if the charging voltage is greater than a voltage threshold and/or the charging current is greater than a current threshold, the main control module sends a charging switch-off instruction, such that the controller controls the communication interface to switch off;

if the charging voltage is less than or equal to the voltage threshold and the charging current is less than or equal to the current threshold, the main control module continues to obtain the charging voltage and the charging current,

the battery charging control method comprises acts of;

A) performing by the main control module a data communication with the external power adapter, and obtaining a charging voltage and a charging current for the battery;

B) determining by the main control module whether the charging voltage is greater than a voltage threshold and determining by the main control module whether the charging current is greater than a current threshold, executing act C if the charging voltage is greater than the voltage threshold and/or the charging current is greater than the current threshold, and returning to act A if the charging voltage is less than or equal to the voltage threshold and the charging current is less than or equal to the current threshold;

C) sending by the main control module a charging switch-off instruction, such that the controller controls the communication interface to switch off.

12. The battery charging control method according to claim 11, wherein, when a quick charging is performed on the battery, the method further comprises following acts after act A:

D) determining by the main control module whether the charging voltage for the battery is zero, executing act E when the charging voltage for the battery is zero, and returning to act A when the charging voltage for the battery is not zero; and

E) controlling by the main control module the quick charging switch module to switch off, and executing act C.

13. The battery charging control method according to claim 12, wherein, act A comprises:

sending by the main control module, a charging parameter obtaining request to the external power adapter;

feeding back by the external power adapter, charging voltage information and charging current information to the main control module according to the charging parameter obtaining request;

obtaining by the main control module, the charging current and the charging voltage for the battery from the charging voltage information and the charging current information.

14. The battery charging control method according to claim 11, wherein, when a quick charging is performed on the battery, the method further comprises following acts after act A:

F) detecting by the main control module a voltage of the battery via the battery connector, determining by the main control module whether the voltage of the battery is greater than a quick charging voltage threshold, executing act G if the voltage of the battery is greater than the quick charging voltage threshold, and executing act B if the voltage is battery is less than or equal to the quick charging voltage threshold; and

G) controlling by the main control module the quick charging switch module to switch off, and executing act B.

15. The battery charging control method according to claim 14, wherein, act A comprises:

sending by the main control module, a charging parameter obtaining request to the external power adapter;

feeding back by the external power adapter, charging voltage information and charging current information to the main control module according to the charging parameter obtaining request;

obtaining by the main control module, the charging current and the charging voltage for the battery from the charging voltage information and the charging current information.

16. The battery charging control method according to claim 14, wherein, the method further comprises following acts executed simultaneously with act F:

H) detecting by the main control module an electric quantity of the battery via the battery connector, and feeding back the electric quantity to the controller.

17. The battery charging control method according to claim 16, wherein, act A comprises:

sending by the main control module, a charging parameter obtaining request to the external power adapter;

feeding back by the external power adapter, charging voltage information and charging current information to the main control module according to the charging parameter obtaining request;

obtaining by the main control module, the charging current and the charging voltage for the battery from the charging voltage information and the charging current information.

18. The battery charging control method according to claim 11, wherein, when a quick charging is performed on the battery, the method further comprises:

feeding back by the controller a quick charging switch-off instruction to the main control module at an abnormal battery temperature;

controlling by the main control module the quick charging switch module to switch off according to the quick charging switch-off instruction.

19. The battery charging control method according to claim 11, wherein, act A comprises following acts:

sending by the main control module, a charging parameter obtaining request to the external power adapter;

feeding back by the external power adapter, charging voltage information and charging current information to the main control module according to the charging parameter obtaining request;

obtaining by the main control module, the charging current and the charging voltage for the battery from the charging voltage information and the charging current information.