Charging control apparatus and method for electronic device

• US 10,291,050 B2
• Filed: 05/06/2014
• Issued: 05/14/2019
• 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, Huang, Dashuai, Hu, Yuanxiang
• Primary Examiner(s): Berhanu, Samuel
• Application Number:
  US15/114,990
• Publication Number:
  US 20160344218A1
• Time in Patent Office: 1,834 Days
• Field of Search: 320128
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/0071 with a programmable schedule
• CPC Class Codes: H02J 7/00714 in response to battery charging or discharging current
• CPC Class Codes: H02J 7/007182 in response to battery voltage
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage
• CPC Class Codes: H02M 1/0009 Devices or circuits for detecting current in a converter
• CPC Class Codes: H02M 1/44 Circuits or arrangements for compensating for electromagnetic interference in converters or inverters

Abstract

A charging control apparatus and method for an electronic device are provided. During a process of charging, the power adapter first charges the battery with a constant-voltage direct current output, and then after the power adapter receives a quick-charging instruction, the power adapter adjusts an output voltage according to the voltage of the battery fed back by the charging control circuit, and if the output voltage meets a quick-charging voltage condition pre-set by the charging control circuit, the power adapter adjusts an output current and the output voltage respectively according to a preset quick-charging current value and a preset quick-charging voltage value for quick-charging the battery, and meanwhile the charging control circuit introduces direct current from the power adapter for charging the battery; during a process of quick-charging, the power adapter adjusts the output current in real time according to the output voltage thereof and the voltage of the battery.

Claims

1. A charging control apparatus for electronic device, comprising a power adapter and a charging control circuit;

the power adapter being configured to charge a battery in the electronic device and to perform data communication with the charging control circuit via a communication interface thereof;

the charging control circuit is-being built in the electronic device and being configured to detect a voltage of the battery;

each of the charging control circuit and the battery being coupled to the communication interface of the power adapter via a communication interface of the electronic device;

wherein during a process of charging the battery, the power adapter first charges the battery with a constant-voltage direct current output, and then after the power adapter receives a quick-charging instruction sent by the charging control circuit, the power adapter adjusts an output voltage according to the voltage of the battery fed back by the charging control circuit, and if the output voltage meets a quick-charging voltage condition pre-set by the charging control circuit, the power adapter adjusts an output current and the output voltage respectively according to a preset quick-charging current value and a preset quick-charging voltage value for quick-charging the battery, and meanwhile the charging control circuit introduces direct current from the power adapter for charging the battery; and

during a process of quick-charging the battery, the power adapter adjusts the output current in real time according to the output voltage thereof and the voltage of the battery.

2. The charging control apparatus for electronic device according to claim 1, wherein, the power adapter comprises an EMI filter circuit, a high-voltage rectifier and filter circuit, an isolation transformer, an output filter circuit and a voltage tracking and control circuit;

the EMI filter circuit is configured to perform an electromagnetic interference filter on the city electricity, the high-voltage rectifier and filter circuit is configured to perform a rectifier and filter on the city electricity after the electromagnetic interference filter for outputting a high-voltage direct current, the isolation transformer is configured to perform an electrical isolation on the high-voltage direct current, the output filter circuit is configured to perform a filter process on an output voltage of the isolation transformer for charging the battery, and the voltage tracking and control circuit is configured to adjust the output voltage of the isolation transformer according to an output voltage of the output filter circuit;

the power adapter further comprises a power circuit, a main control circuit, a potential adjustment circuit, a current detection circuit, a voltage detection circuit and an output switch circuit;

an input terminal of the power circuit is coupled to a secondary terminal of the isolation transformer, a power terminal of the main control circuit, a power terminal of the potential adjustment circuit and a power terminal of the current detection circuit are collectively coupled to an output terminal of the power circuit, each of a high-potential terminal of the main control circuit and a high-potential terminal of the potential adjustment circuit is coupled to a positive output terminal of the output filter circuit, a potential adjustment terminal of the potential adjustment circuit is coupled to the voltage tracking and control circuit, a direct current input terminal of the current detection circuit is coupled to the positive output terminal of the output filter circuit, a current sensing and feedback terminal of the current detection circuit is coupled to a current detection terminal of the main control circuit, a clock output terminal and a data output terminal of the main control circuit are coupled to a clock input terminal and a data input terminal of the potential adjustment circuit respectively, a first detection terminal and a second detection terminal of the voltage detection circuit are coupled to a direct current output terminal of the current detection circuit and a negative output terminal of the output filter circuit respectively, a first output terminal and a second output terminal of the voltage detection circuit are coupled to a first voltage detection terminal and a second voltage detection terminal of the main control circuit respectively, an input terminal of the output switch circuit is coupled to the direct current output terminal of the current detection circuit, an output terminal of the output switch circuit is coupled to a third detection terminal of the voltage detection circuit, a ground terminal of the output switch circuit is coupled to the negative output terminal of the output filter circuit, a controlled terminal and a power terminal of the output switch circuit are coupled to a switch control terminal of the main control circuit and the secondary terminal of the isolation transformer respectively, each of the negative output terminal of the output filter circuit, the output terminal of the output switch, a first communication terminal and a second communication terminal of the main control is coupled to the communication interface of the power adapter;

during charging the battery by the power adapter with the constant-voltage direct-current output, the main control circuit controls the output switch circuit to switch off the direct current output of the power adapter;

the voltage detection circuit detects the output voltage of the power adapter and feeds back a voltage detection signal to the main control circuit;

the main control circuit determines whether the output voltage of the power adapter is greater than a voltage threshold according to the voltage detection signal, if yes, the voltage detection circuit continues to detect and determine the output voltage of the power adapter, and if no, the main control circuit controls the output switch circuit to switch on the direct current output of the power adapter, and drives the voltage tracking and control circuit via the potential adjustment circuit to set the output voltage of the isolation transformer as a conventional output voltage;

the current detection circuit detects the output current of the power adapter and feeds back a current detection signal to the main control circuit;

if the main control circuit determines that the output current of the power adapter is within a conventional current range for a preset period of time according to the current detection signal, the main control circuit performs a quick-charging inquiry communication with the charging control circuit;

after the charging control circuit sends a quick-charging instruction to the main control circuit, the main control circuit drives the voltage tracking and control circuit via the potential adjustment circuit to adjust the output voltage of the isolation transformer according to the voltage of the battery fed back by the charging control circuit, and if the output voltage of the power adapter meets the quick-charging voltage condition pre-set by the charging control circuit, the main control circuit drives the voltage tracking and control circuit via the potential adjustment circuit to adjust the output voltage of the isolation transformer such that the power adapter outputs the direct current according to the quick-charging current value and the quick-charging voltage value for quick-charging the battery, and meanwhile the charging control circuit introduces the direct current from the power adapter for charging the battery;

during the process of quick-charging, the main control circuit determines whether a difference between the output voltage and the voltage of the battery is greater than a voltage difference threshold according to the voltage of the battery fed back by the charging control circuit, if yes, the main control circuit controls the output switch circuit to switch off the direct current output, and if no, the main control circuit drives the voltage tracking and control circuit via the potential adjustment circuit to adjust the output voltage of the isolation transformer according to the voltage of the battery fed back by the charging control circuit, such that adjusting the output current of the power adapter is realized.

3. The charging control apparatus for electronic device according to claim 2, wherein,

the power circuit comprises:

a first capacitor, a voltage stabilizing chip, a second capacitor, a first inductor, a second inductor, a first diode, a second diode, a third capacitor, a first resistor and a second resistor;

a collective node of a first terminal of the first capacitor, and an input power pin and an enable pin of the voltage stabilizing chip is configured as the input terminal of the power circuit a second terminal of the first capacitor and a ground pin of the voltage stabilizing chip are collectively coupled to ground, a switch pin of the voltage stabilizing chip and a first terminal of the second capacitor are collectively coupled to a first terminal of the first inductor, an internal switch pin of the voltage stabilizing chip and a second terminal of the second capacitor are collectively coupled to a cathode of the first diode, a feedback voltage pin of the voltage stabilizing chip is coupled to a first terminal of the first resistor and a first terminal of the second resistor respectively, a second terminal of the first inductor and a cathode of the second diode are collectively coupled to a first terminal of the second inductor, a collective node formed by collectively connecting a second terminal of the second inductor, an anode of the first diode, a second terminal of the first resistor and a first terminal of the third capacitor is configured as the output terminal of the power circuit, and an anode of the second diode, a second terminal of the second resistor and a second terminal of the third capacitor are collectively coupled to ground.

4. The charging control apparatus for electronic device according to claim 2, wherein,

the main control circuit comprises:

a main control chip, a third resistor, a reference voltage chip, a fourth resistor, a fifth resistor, a fourth capacitor, a sixth resistor, a seventh resistor, a first NMOS transistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor and a fourteenth resistor;

a power pin of the main control chip is configured as the power terminal of the main control circuit, a ground pin of the main control chip is coupled to ground, a first input/output pin of the main control chip is suspended, a first terminal of the third resistor is coupled to the power pin of the main control chip, a second terminal of the third resistor and a first terminal of the fourth resistor are collectively coupled to a cathode of the reference voltage chip, an anode of the reference voltage chip is coupled to ground, a vacant pin of the reference voltage chip U3 is suspended, a second terminal of the fourth resistor is coupled to a second input/output pin of the main control chip, a third input/output pin of the main control chip is the current detection terminal of the main control circuit, a fourth input/output pin of the main control chip is coupled to a first terminal of the fifth resistor, a second terminal of the fifth resistor and a first terminal of the fourth capacitor are collectively coupled to the power pin of the main control chip, a second terminal of the fourth capacitor is coupled to ground, a fifth input/output pin of the main control chip is configured as the switch control terminal of the main control circuit, a sixth input/output pin of the main control chip is coupled to a first terminal of the sixth resistor, a second terminal of the sixth resistor and a grid electrode of the first NMOS transistor are collectively coupled to a first terminal of the seventh resistor, a second terminal of the seventh resistor and a source electrode of the first NMOS transistor are collectively coupled to ground, a drain electrode of the first NMOS transistor is coupled to a first terminal of the eighth resistor, a second terminal of the eighth resistor is configured as the high-potential terminal of the main control circuit, a seventh input/output pin and an eighth input/output pin of the main control chip are configured as the clock output terminal and the data output terminal of the main control circuit respectively, a ninth input/output pin and a tenth input/output pin of the main control chip are configured as the second voltage detection terminal and the first voltage detection terminal of the main control circuit respectively, an eleventh input/output pin and a twelfth input/output pin of the main control chip are coupled to a first terminal of the ninth resistor and a first terminal of the tenth resistor respectively, a first terminal of the eleventh resistor and a first terminal of the twelfth resistor are coupled to a second terminal of the ninth resistor and a second terminal of the tenth resistor respectively, a second terminal of the eleventh resistor and a second terminal of the twelfth resistor are collectively coupled to ground, a first terminal of the thirteenth resistor and a first terminal of the fourteenth resistor are coupled to the second terminal of the ninth resistor and the second terminal of the tenth resistor respectively, a second terminal of the thirteenth resistor and a second terminal of the fourteenth resistor are collectively coupled to the power pin of the main control chip, and the second terminal of the ninth resistor and the second terminal of the tenth resistor are configured as the first communication terminal and the second communication terminal of the main control circuit respectively.

5. The charging control apparatus for electronic device according to claim 2, wherein,

the potential adjustment circuit comprises:

a fifteenth resistor, a sixteenth resistor, a digital potentiometer, a seventeenth resistor, an eighteenth resistor, a fifth capacitor, a sixth capacitor and a nineteenth resistor;

a collective node of a first terminal of the fifteenth resistor, a first terminal of the sixteenth resistor, a power pin of the digital potentiometer and a first terminal of the fifth capacitor is configured as the power terminal of the potential adjustment circuit, a second terminal of the fifth capacitor, a first terminal of the sixth capacitor, a ground pin of the digital potentiometer and a first terminal of the seventeenth resistor are collectively coupled to ground, a second terminal of the sixth capacitor is coupled to the power pin of the digital potentiometer, a collective node of a second terminal of the fifteenth resistor and a serial data pin of the digital potentiometer is configured as the data input terminal of the potential adjustment circuit, a collective node of a second terminal of the sixteenth resistor and a clock input pin of the digital potentiometer is configured as the clock input terminal of the potential adjustment circuit, an address zero pin of the digital potentiometer is coupled to ground, a first potential wiring pin of the digital potentiometer and a first terminal of the eighteenth resistor are collectively coupled to a second terminal of the seventeenth resistor, a second terminal of the eighteenth resistor and a second potential wiring pin of the digital potentiometer are collectively coupled to a first terminal of the nineteenth resistor, a second terminal of the nineteenth resistor is configured as the high-potential terminal of the potential adjustment circuit, and a potential tap pin of the digital potentiometer is configured as the potential adjustment terminal of the potential adjustment circuit.

6. The charging control apparatus for electronic device according to claim 2, wherein,

the current detection circuit comprises:

a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a seventh capacitor, an eighth capacitor, a current sensing chip, a twenty-third resistor, a ninth capacitor, a tenth capacitor and a twenty-fourth resistor;

a first terminal and a second terminal of the twentieth resistor are configured as the direct current input terminal and the direct current output terminal of the current detection circuit respectively, a first terminal of the twenty-first resistor and a first terminal of the twenty-second resistor are coupled to the first terminal and the second terminal of the twentieth resistor respectively, a second terminal of the twenty-first resistor and a first terminal of the seventh capacitor are collectively coupled to a positive input pin of the current sensing chip, a second terminal of the twenty-second resistor and a first terminal of the eighth capacitor are collectively coupled to a negative input pin of the current sensing chip, a collective node of a power pin of the current sensing chip and a first terminal of the ninth capacitor is configured as the power terminal of the current detection circuit, a vacant pin of the current sensing chip is suspended, an output pin of the current sensing chip is coupled to a first terminal of the twenty-third resistor, a second terminal of the twenty-third resistor is configured as the current sensing and feedback terminal of the current detection circuit, a first terminal of the tenth capacitor and a first terminal of the twenty-fourth resistor are collectively coupled to the second terminal of the twenty-third resistor, a second terminal of the seventh capacitor, a second terminal of the eighth capacitor, a second terminal of the ninth capacitor, a second terminal of the tenth capacitor, a second terminal of the twenty-fourth resistor, and a ground pin, a first reference voltage pin and a second reference voltage pin of the current sensing chip are collectively coupled to ground.

7. The charging control apparatus for electronic device according to claim 2, wherein,

the voltage detection circuit comprises:

a twenty-fifth resistor, a twenty-sixth resistor, an eleventh capacitor, a twelfth capacitor, a twenty-seventh resistor and a twenty-eighth resistor;

a first terminal of the twenty-fifth resistor is configured as the first detection terminal of the voltage detection circuit, a collective node of a second terminal of the twenty-fifth resistor, a first terminal of the twenty-sixth resistor and a first terminal of the eleventh capacitor is configured as the second output terminal of the voltage detection circuit, a second terminal of the twenty-sixth resistor is configured as the second detection terminal of the voltage detection circuit, a second terminal of the eleventh capacitor, a first terminal of the twelfth capacitor and a first terminal of the twenty-seventh resistor are collectively coupled to the second terminal of the twenty-sixth resistor, a collective node of a second terminal of the twelfth capacitor, a second terminal of the twenty-seventh resistor and a first terminal of the twenty-eighth resistor is configured as the first output terminal of the voltage detection circuit, and a second terminal of the twenty-eighth resistor is configured as the third detection terminal of the voltage detection circuit.

8. The charging control apparatus for electronic device according to claim 2, wherein,

the output switch circuit comprises:

a twenty-ninth resistor, a thirtieth resistor, a thirteenth capacitor, a thirty-first resistor, a first NPN type transistor, a thirty-second resistor, a second NPN type transistor, a third diode, a voltage stabilizing diode, a thirty-third resistor, a thirty-fourth resistor, a thirty-fifth resistor, a second NMOS transistor and a third NMOS transistor;

a first terminal of the twenty-ninth resistor is configured as the controlled terminal of the output switch circuit, a second terminal of the twenty-ninth resistor and a first terminal of the thirtieth resistor are collectively coupled to a base of the first NPN type transistor, a first terminal of the thirteenth capacitor, a first terminal of the thirty-first resistor and a first terminal of the thirty-second resistor are collectively coupled to a cathode of the third diode, an anode of the third diode is configured as the power terminal of the output switch circuit, a second terminal of the thirty-first resistor and a base of the second NPN type transistor are collectively coupled to a collector of the first NPN type transistor, a second terminal of the thirty-second resistor, a cathode of the voltage stabilizing diode and a first terminal of the thirty-third resistor are collectively coupled to a collector of the second NPN type transistor, a second terminal of the thirtieth resistor, a second terminal of the thirteenth capacitor, an emitter of the first NPN type transistor, an emitter of the second NPN type transistor and an anode of the voltage stabilizing diode are collectively coupled to ground, a second terminal of the thirty-third resistor, a first terminal of the thirty-fourth resistor, a first terminal of the thirty-fifth resistor, a grid electrode of the second NMOS transistor and a grid electrode of the third NMOS transistor are collectively coupled, a second terminal of the thirty-fourth resistor is configured as the ground terminal of the output switch circuit, a drain electrode of the second NMOS transistor is configured as the input terminal of the output switch circuit, a source electrode of the second NMOS transistor and a second terminal of the thirty-fifth resistor are collectively coupled to a source electrode of the third NMOS transistor, and a drain electrode of the third NMOS transistor is configured as the output terminal of the output switch circuit.

9. The charging control apparatus for electronic device according to claim 2, being characterized at that,

the charging control circuit comprises:

a battery connector, a main controller, a thirteenth capacitor, a thirty-sixth resistor, 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 type transistor, a fourth NMOS transistor and a fifth NMOS transistor;

the battery connector is coupled to a plurality of electrodes of the battery, a first pin and a second pin of the battery connector are collectively coupled to ground, a first ground pin and a second ground pin of the battery connector are collectively coupled to ground, 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 to a sixth pin, a fifth pin, a fourth pin and a third pin of the battery connector respectively, an analog ground pin and a ground pin of the main controller are coupled to ground, 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 collectively 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 perform data communication with the electronic device, the thirty-sixth resistor is coupled between the fourth input/output pin and the power pin of the main controller, a sixth input/output pin and a twelfth input/output pin of the main controller are coupled to the first communication terminal and the second communication terminal of the main control circuit in the power adapter respectively, a first terminal of the thirty-seventh resistor and a first terminal of the thirty-eighth resistor are collectively coupled to a tenth input/output pin of the main controller, a second terminal of the thirty-seventh resistor is coupled to the power pin of the power adapter, a second terminal of the thirty-eighth resistor is coupled to a base of the third NPN type transistor, a fifth input/output pin of the main controller is coupled to a first terminal of the fourteenth capacitor, a second terminal of the fourteenth capacitor and a cathode of the first Schottky diode are collectively 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 collectively 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 type transistor is coupled to a grid electrode of the fourth NMOS transistor and a grid electrode of the fifth NMOS transistor respectively, a second terminal of the fortieth resistor and a second terminal of the fifteenth capacitor are collectively coupled to ground, a source electrode of the fourth NMOS transistor is coupled to an anode of the first Schottky diode and further coupled to the seventh pin and the eighth pin of the battery connector, a drain electrode of the fourth NMOS transistor is coupled to a drain electrode of the fifth NMOS transistor, a source electrode of the fifth NMOS transistor is coupled to a power wire of the communication interface of the electronic device, an emitter of the third NPN type transistor is coupled to an anode of the third Schottky diode, and a cathode of the third Schottky diode is coupled to ground.

10. The charging control apparatus for electronic device according to claim 9, wherein,

the charging control circuit further comprises:

a sixth NMOS transistor, a seventh NMOS transistor and a forty-first resistor;

a source electrode of the sixth NMOS transistor is coupled to a source electrode of the fifth NMOS transistor, a drain electrode of the sixth NMOS transistor is coupled to a drain electrode of the seventh NMOS transistor, a source electrode of the seventh NMOS transistor is coupled to a collector of the third NPN transistor, a grid electrode of the sixth NMOS transistor and a grid electrode of the seventh NMOS transistor are collectively coupled to a first terminal of the forty-first resistor, and a second terminal of the forty-first resistor is coupled to ground.

18. The charging control apparatus for electronic device according to claim 2, wherein

when the power adapter charges the battery with the constant-voltage direct-current output firstly, if the output current of the power adapter is less than a current lower limit, the current detection circuit continues to detect the output current of the power adapter and to feed back the current detection signal to the main control circuit, and if the output current of the power adapter is greater than a current upper limit, the main control circuit controls the output switch circuit to turn off the direct current output of the power adapter.

19. The charging control apparatus for electronic device according to claim 2, wherein

if the output voltage of the power adapter does not meet the quick-charging voltage condition, the main control circuit drives the voltage tracking and control circuit via the potential adjustment circuit to adjust the output voltage of the isolation transformer according to a voltage deviation feedback signal sent by the charging control circuit.

20. The charging control apparatus for electronic device according to claim 2, wherein,

the charging control circuit comprises:

a battery connector, a main controller, a thirteenth capacitor, a thirty-sixth resistor, 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 type transistor, a fourth NMOS transistor and a fifth NMOS transistor;

the battery connector is coupled to a plurality of electrodes of the battery, a first pin and a second pin of the battery connector are collectively coupled to ground, a first ground pin and a second ground pin of the battery connector are collectively coupled to ground, 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 to a sixth pin, a fifth pin, a fourth pin and a third pin of the battery connector respectively, an analog ground pin and a ground pin of the main controller are coupled to ground, 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 collectively 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 perform data communication with the electronic device, the thirty-sixth resistor is coupled between the fourth input/output pin and the power pin of the main controller, a sixth input/output pin and a twelfth input/output pin of the main controller are coupled to the first communication terminal and the second communication terminal of the main control circuit in the power adapter respectively, a first terminal of the thirty-seventh resistor and a first terminal of the thirty-eighth resistor are collectively coupled to a tenth input/output pin of the main controller, a second terminal of the thirty-seventh resistor is coupled to the power pin of the power adapter, a second terminal of the thirty-eighth resistor is coupled to a base of the third NPN type transistor, a fifth input/output pin of the main controller is coupled to a first terminal of the fourteenth capacitor, a second terminal of the fourteenth capacitor and a cathode of the first Schottky diode are collectively 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 collectively 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 type transistor is coupled to a grid electrode of the fourth NMOS transistor and a grid electrode of the fifth NMOS transistor respectively, a second terminal of the fortieth resistor and a second terminal of the fifteenth capacitor are collectively coupled to ground, a source electrode of the fourth NMOS transistor is coupled to an anode of the first Schottky diode and further coupled to the seventh pin and the eighth pin of the battery connector, a drain electrode of the fourth NMOS transistor is coupled to a drain electrode of the fifth NMOS transistor, a source electrode of the fifth NMOS transistor is coupled to a power wire of the communication interface of the electronic device, an emitter of the third NPN type transistor is coupled to an anode of the third Schottky diode, and a cathode of the third Schottky diode is coupled to ground.

11. A charging control method for electronic device, comprising steps of:

during a process of charging the battery, firstly charging the battery by the power adapter with the constant-voltage direct-current output;

after receiving a quick-charging instruction sent by the charging control circuit, adjusting an output voltage by the power adapter according to a voltage of the battery fed back by the charging control circuit;

if the output voltage meets a quick-charging voltage condition pre-set by the charging control circuit, adjusting an output current and the output voltage respectively by the power adapter according to a preset quick-charging current value and a preset quick-charging voltage value for quick-charging the battery, and introducing the direct current from the power adapter simultaneously by the charging control circuit for charging the battery;

adjusting the output current in real time by the power adapter according to the output voltage of the power adapter and the voltage of the battery.

12. The charging control method for the electronic device according to claim 11, further comprising steps of:

if the output voltage of the power adapter does not meet the quick-charging voltage condition pre-set by the charging control circuit, adjusting the output current by the power adapter according to a voltage deviation feedback signal sent by the charging control circuit.

13. The charging control method for electronic device according to claim 11 wherein, firstly charging the battery by the power adapter with the constant-voltage direct-current output comprises:

detecting and determining by the power adapter whether a voltage at a communication interface of the power adapter is greater than a voltage threshold under a case that the direct current output is switched off;

if yes, continuing to detect and determine by the power adapter whether the voltage at the communication interface of the power adapter is greater than the voltage threshold under the case that the direct current output is switched off;

if no, outputting the direct current by the power adapter according to a preset conventional output voltage.

14. The charging control method for electronic device according to claim 11 wherein, adjusting the output voltage by the power adapter according to the voltage of the battery fed back by the charging control circuit comprises:

calculating, by the power adapter, a sum of the voltage of the battery fed back by the charging control circuit and a preset voltage incremental value to obtain a preset quick-charging voltage value;

adjusting, by the power adapter, the output voltage according to the preset quick-charging voltage value.

15. The charging control method for electronic device according to claim 11 wherein, adjusting the output in real time current by the power adapter according to the output voltage of the power adapter and the voltage of the battery comprises:

determining, by the power adapter, whether a difference between the output voltage and the voltage of the battery is greater than a voltage difference threshold according to the voltage of the battery fed back by the charging control circuit;

if yes, turning off, by the power adapter, the direct current output; and

if no, adjusting, by the power adapter, the output current according to the voltage of the battery fed back by the charging control circuit.

16. The charging control method for electronic device according to claim 11, further comprising:

sending by the power adapter a quick-charging inquiry instruction to the charging control circuit if the output current of the power adapter is within a conventional current range during a preset period of time;

determining by the charging control circuit the voltage of the battery according to the quick-charging inquiry instruction and feeding back by the charging control circuit the quick-charging instruction to the power adapter if the voltage of the battery reaches the quick-charging voltage value.

17. The charging control method for electronic device according to claim 12, further comprising:

sending by the power adapter output voltage information to the charging control circuit when the power adapter performs data communication with the charging control circuit;

determining by the charging control circuit whether the output voltage of the power adapter is within a rated quick-charging voltage range or equal to a rated quick-charging voltage value according to the output voltage information;

if yes, adjusting the output current and the output voltage respectively by the power adapter according to the preset quick-charging current value and the preset quick-charging voltage value for quick-charging the battery, and introducing the direct current from the power adapter simultaneously by the charging control circuit for charging the battery; and

if no, adjusting the output current by the power adapter according to the voltage deviation feedback signal sent by the charging control circuit.

21. A charging device for battery comprising:

a transformer configured to output voltage and current to charge the battery;

a potential adjustment circuit coupled to the transformer and configured to adjust output current of the transformer;

a main control circuit coupled to the potential adjustment circuit and configured to control the potential adjusting circuit to adjust the output current of the transformer;

a charging control circuit coupled to the main control circuit and configured to communicate with the main control circuit and obtain a real-time voltage of the battery;

wherein, when the battery is charged, when the transformer outputs a first output current, the main control circuit communicates with the charging control circuit to inquiry whether the battery needs to be charged with a second output current output by the transformer, the second output current is larger than the first output current, the charging control circuit replies the main control circuit the real-time voltage of the battery and send charging instruction with the second output current to the main control circuit, the main control circuit controls the transformer to output the second output current to charge the battery via the potential adjustment circuit according to the real-time voltage of the battery.

22. The charging device of claim 21, wherein, before the transformer outputs the second output current to charge the battery, the main control circuit controls the transformer to adjust output voltages via the potential adjustment circuit until the output voltage of the transformer matches with the real-time voltage of the battery.

23. The charging device of claim 22, wherein the first output current is less than 4 A.

24. The charging device of claim 23, wherein the second output current is no less than 4 A.

25. The charging device of claim 24, wherein when the transformer outputs the second output current, the output voltage of the transformer is in a range from about 3.4V to about 4.8V.