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

Patent metadata

Field	Value
Publication number	US-9935490-B2
Application number	US-201415115045-A
Country	US
Kind code	B2
Filing date	May 7, 2014
Priority date	Jan 28, 2014
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

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 circuit and a quick charging switch circuit is adopted. During the regular charging or the quick charging, the main control circuit 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 circuit 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 circuit continues to obtain the charging voltage and the charging current.

First claim

What is claimed is:

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 circuit and a quick charging switch circuit;
the battery connector is configured to be coupled with an electrode of the battery, the main control circuit is coupled with the battery connector, a first switch control terminal and a second switch control terminal of the main control circuit are coupled with a first controlled terminal and a second controlled terminal of the quick charging switch circuit respectively, both a first communication terminal and a second communication terminal of the main control circuit are coupled with the communication interface, the main control circuit is also coupled with the controller, an input terminal of the quick charging switch circuit is coupled with a power wire of the communication interface, and an output terminal of the quick charging switch circuit is coupled with the battery connector;
when a regular charging is performed on the battery, the main control circuit controls the quick charging switch module circuit to switch off; when a quick charging is performed on the battery, the main control circuit controls the quick charging switch circuit to switch on, and the direct current is introduced into the quick charging switch circuit 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 circuit 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 circuit 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 circuit continues to obtain the charging voltage and the charging current.

2. The battery charging control device according to claim 1 , wherein, the main control circuit 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 circuit 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 circuit respectively.

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 circuit 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 circuit, 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 circuit, 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 circuit, 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 circuit 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, in response to a power source reversal connection for the communication interface, when the quick charging is performed on the battery, 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, the controller feeds back a quick charging switch-off instruction to the main control circuit at an abnormal battery temperature, such that the m

Assignees

• Guangdong Oppo Mobile Telecommunications Corp Ltd
• Guangdong Oppo Mobile Telelcommunications Corp Ltd

Inventors

• Zhang Jialiang
• Wu Kewei
• Zhang Jun
• Liao Fuchun
• Hu Yuanxiang

Classifications

• H02J7/62

  against overcurrent · CPC title

• H02J7/61

  against overcharge · CPC title

• H02J7/42

  with electronic devices having internal batteries, e.g. mobile phones · CPC title

• H02J7/663

  using battery or load disconnect circuits (H02J9/002 takes precedence) · CPC title

• H02J7/64 Primary

  against overvoltage · CPC title