TERMINAL AND BATTERY CHARGING CONTROL DEVICE AND METHOD THEREFOR

• US 20160344227A1
• Filed: 05/07/2014
• Published: 11/24/2016
• 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
• Granted Patent: US 9,935,490 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 therefore. The battery charging control device comprising a battery connector, a main control module and a fast charge switch module is adopted. During normal charge or fast charge of a battery in the terminal, the main control module carries out data communication with an external power adapter through a communication interface of the terminal, and obtains a charging voltage and a charging current of the battery; and if the charging voltage is larger than a voltage threshold and/or the charging current is larger than a current threshold, the main control module sends a charging OFF command so that a controller of the terminal enables the communication interface of the terminal, thereby achieving overvoltage and/or overcurrent protection on the battery.

Claims

1. A battery charging control device, configured to 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, and being characterized at that, 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 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.

2. The battery charging control device according to claim 1, being characterized at that, 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 respectively, a second input/output pin, a seventh input/output pin, an eighth input/output pin and a ninth input/output pin of the main controller are coupled with a sixth pin, a fifth pin, a fourth pin and a third pin of the battery connector respectively, 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 the controller, 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 and a tenth input/output pin of the main controller are configured as the first switch control terminal and the second switch control terminal of the main control module respectively, a sixth input/output pin and a twelfth input/output pin of the main controller are configured as the first communication terminal and the second communication terminal of the main control module respectively.

3. The battery charging control device according to claim 1, being characterized at that, the quick charging switch module comprises a thirty-seventh resistor, a fourteenth capacitor, a first Schottky diode, a second 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.

4. The battery charging control device according to claim 3, being characterized at that, 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.

5. A terminal, comprising a communication interface, a controller and a battery, and being characterized at that, the terminal further comprises a battery charging control device according to any one of claims 1-4.

6. A battery charging control method, based on a battery charging control device according to claim 1, and being characterized at that, the battery charging control method comprises acts of:

A. performing by the main control module a data communication with an 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.

7. The battery charging control method according to claim 6, being characterized at that, 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 if the charging voltage for the battery is zero, and returning to act A if the charging voltage for the battery is not zero;

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

8. The battery charging control method according to claim 6, being characterized at that, 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;

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

9. The battery charging control method according to claim 8, being characterized at that, 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.

10. The battery charging control method according to any one of claims 6-9, being characterized at that, 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.