POWER ADAPTER, ELECTRONIC DEVICE, AND CHARGING APPARATUS FOR ELECTRONIC DEVICE

• US 20160380462A1
• Filed: 05/12/2014
• Published: 12/29/2016
• 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: LIAO, Fuchun, ZHANG, Jialiang, WU, Kewei, ZHANG, Jun, HU, Yuanxiang
• Granted Patent: US 10,224,725 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 2207/10 Control circuit supply, e.g. means for supplying power to the control circuit
• 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 7/00036 Charger exchanging data with battery
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/0034 using reverse polarity correcting or protecting circuits mechanical means of polarity protection H02J7/0045
• CPC Class Codes: H02J 7/0036 using connection detecting circuits H02J7/0034 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 7/00714 in response to battery charging or discharging current
• CPC Class Codes: H02J 7/007184 in response to battery voltage gradient
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage

Abstract

The present disclosure provides a power adapter, an electronic device and a charging apparatus for an electronic device. In the process of charging a battery in a conventional charge mode after the power adapter is powered on, the power adapter carries out quick charge inquiry communication with the electronic device when an output current value of the power adapter is within a conventional current range for a preset time interval; after the electronic device sends a quick charge command to the power adapter, the power adapter adjusts the output voltage according to the battery voltage information fed back by the electronic device; and when the output voltage meets a voltage requirement for quick charge preset by the electronic device, the power adapter adjusts the output current and the output voltage for charging the battery in a quick charge mode.

Claims

1. A power adapter, configured to be coupled to a communication interface of an electronic device via a communication interface thereof and to charge a battery in the electronic device, and configured to:

switch off direct current output thereof and detect an output voltage thereof, after being powered on or reset;

if the output voltage is greater than a voltage threshold, continue to judge the output voltage thereof;

if the output voltage is not greater than the voltage threshold, switch on the direct current output, set the output voltage as a conventional output voltage, and detect an output current thereof;

if the output current is within a conventional current range for a preset time period, perform a quick charge inquiry communication with the electronic device;

adjust the output voltage according to battery voltage information fed back by the electronic device, after receiving a quick charge command sent by the electronic device;

and if the output voltage meets a voltage requirement for quick charge predefined by the electronic device, adjust the output voltage and the output current for outputting direct current according to a quick charge voltage value and a quick charge current value.

11. The power adapter of 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 mains supply, the high-voltage rectifier and filter circuit is configured to perform a rectifier and filtering process on an output voltage of the EMI filter circuit 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 filtering process on an output voltage of the isolation transformer so as to charge the battery, and the voltage tracking and control circuit is configured to regulate 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 regulation 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 regulation circuit, and a power terminal of the current detection circuit are jointly coupled to an output terminal of the power circuit, a high-potential terminal of the main control circuit and a high-potential terminal of the potential regulation circuit are both coupled to a positive output terminal of the output filter circuit, a potential regulation terminal of the potential regulation circuit is coupled to the voltage tracking and control circuit;

a direct current input terminal of the current detection circuit is coupled to a positive output terminal of the output filter circuit;

a current detection 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 regulation circuit;

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 a 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 a negative output terminal of the output filter circuit, the output terminal of the output switch circuit, and a first communication terminal and a second communication terminal of the main control circuit is coupled to the communication interface of the power adaptor.

12. The power adapter of claim 1, wherein, during the quick charge inquiry communication, the main control circuit sends a quick charge inquiry command to the electronic device, such that the electronic device determines whether a voltage of the battery reaches the quick charge voltage value according to the quick charge inquiry command, feeds back the quick charge command to the main control circuit if the voltage of the battery reaches the quick charge voltage value, and feeds back a quick charge rejecting command to the main control circuit if the voltage of the battery does not reach the quick charge voltage value.

13. The power adapter of claim 12, wherein, after receiving the quick charge command, the main control circuit sends a request for obtaining the voltage of the battery to the electronic device according to the quick charge command, such that the electronic device feeds back the battery voltage information to the main control circuit according to the request of obtaining the voltage of the battery, and the main control circuit drives the voltage tracking and control circuit through the potential regulation circuit to adjust the output voltage of the isolation transformer, according to battery voltage information fed back by the electronic device.

14. The power adapter of claim 11, wherein,

if the electronic device determines that the output voltage of the power adapter meets the voltage requirement for quick charge, the electronic device feeds back a command for starting a quick charge mode to the main control circuit;

and

based on the command for starting the quick charge mode, the main control circuit drives the voltage tracking and control circuit through the potential regulation circuit to adjust the output voltage and output current of the isolation transformer, such that the power adapter outputs the direct current according to the quick charge voltage value and the quick charge current value.

15. The power adapter of claim 11, wherein,

if the electronic device determines that the output voltage of the power adapter does not meet the voltage requirement for quick charge, the electronic device sends a voltage bias feedback signal to the main control circuit, and the main control circuit drives the voltage tracking and control circuit through the potential regulation circuit to adjust the output voltage of the isolation transformer and continues to perform the quick charge inquiry communication with the electronic device.

16. The power adapter of claim 14, wherein after receiving the command for starting the quick charge mode,

the main control circuit drives the voltage tracking and control circuit through the potential regulation circuit to adjust the output voltage of the isolation transformer, such that the output voltage and the output current of the power adapter are adjusted to the quick charge voltage value and the quick charge current value respectively;

the main control circuit obtains the battery voltage information from the electronic device in real time, and determines according to a voltage feedback signal fed back by the voltage detection circuit in real time, whether a voltage difference between Response to Notification of Insufficiency &

Second Preliminary Amendment the voltage of the battery and the output voltage of the power adapter is greater than a voltage difference threshold;

if the voltage difference between the voltage of the battery and the output voltage of the power adapter is greater than the voltage difference threshold, the main control circuit controls the output switch circuit to switch off the direct current output of the power adapter; and

if the voltage difference between the voltage of the battery and the output voltage of the power adapter is less than or equal to the voltage difference threshold, the main control circuit drives the voltage tracking and control circuit through the potential regulation circuit to adjust the output voltage of the isolation transformer according to the battery voltage information, so as to adjust the output current of the power adapter.

17. The power adapter of claim 1, wherein the quick charge current value is 4 A, and the quick charge voltage value is any value selected from 3.4V to 4.8V.

18. The power adapter of claim 1, wherein the power adapter is configured to:

detect an output current value thereof after being powered on or reset;

continue to detect the output current value if the output current value is less than a lower current limit; and

switch off the direct current output thereof if the output current value is greater than an upper current limit.

19. The power adapter of claim 11, wherein during the power adapter charges the battery according to the quick charge voltage value and the quick charge current value, the electronic device stops introducing direct current from the power adapter and feeds back a quick charge stop command to the main control circuit if the voltage of the battery is greater than a quick charge voltage threshold, and the main control circuit controls the power adapter to switch from a quick charge mode to a conventional charge mode according to the quick charge stop command.

20. The power adapter of claim 11, 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 junction 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 jointly grounded;

a switch pin of the voltage stabilizing chip and a first terminal of the second capacitor are jointly 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 jointly coupled to a cathode of the first diode;

a voltage feedback pin of the voltage stabilizing chip is coupled to a first terminal of the first resistor and a first terminal of the second resistor, a second terminal of the first inductor and a cathode of the second diode are jointly coupled to a first terminal of the second inductor, a junction of 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;

an anode of the second diode, a second terminal of the second resistor and a second terminal of the third capacitor are jointly grounded.

21. The power adapter of claim 11, 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 grounded, 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 jointly coupled to a cathode of the reference voltage chip, an anode of the reference voltage chip is grounded, a vacant pin of the reference voltage chip 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 configured as 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 jointly coupled to the power pin of the main control chip, a second terminal of the fourth capacitor is grounded;

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 gate electrode of the first NMOS transistor are jointly 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 jointly grounded;

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 tenth input/output pin and a ninth input/output pin of the main control chip are configured as the first voltage detection terminal and the second 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 jointly grounded;

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 jointly 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.

22. The power adapter of claim 11, wherein

the potential regulation 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 junction 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 regulation 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 jointly grounded;

a second terminal of the sixth capacitor is coupled to the power pin of the digital potentiometer;

a junction 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 regulation circuit;

a junction 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 regulation circuit;

an address zero pin of the digital potentiometer is grounded;

a first potential wiring pin of the digital potentiometer and a first terminal of the eighteenth resistor are jointly 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 jointly 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 regulation circuit; and

a potential tap pin of the digital potentiometer is configured as the potential regulation terminal of the potential regulation circuit.

23. The power adapter of claim 11, 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 detection 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 a first terminal and a second terminal of the twentieth resistor respectively;

a second terminal of the twenty-first resistor and a first terminal of the seventh capacitor are jointly coupled to a positive input pin of the current detection chip;

a second terminal of the twenty-second resistor and a first terminal of the eighth capacitor are jointly coupled to a negative input pin of the current detection chip;

a junction of a power pin of the current detection 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 detection chip is suspended;

an output pin of current detection 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 detection feedback terminal of the current detection circuit;

a first terminal of the tenth capacitor and a first terminal of the twenty-fourth resistor are jointly coupled to a 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 detection chip are jointly grounded.

24. The power adapter of claim 11, 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 junction 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 jointly coupled to a second terminal of the twenty-sixth resistor;

a junction 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.

25. The power adapter of claim 11, wherein

the output switch circuit comprises:

a twenty-ninth resistor, a thirtieth resistor, a thirteenth capacitor, a thirty-first resistor, a first NPN triode, a thirty-second resistor, a second NPN triode, 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 jointly coupled to a base electrode of the first NPN triode;

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 jointly 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 electrode of the second NPN triode are jointly coupled to a collector electrode of the first NPN triode;

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 jointly coupled to a collector electrode of the second NPN triode;

a second terminal of the thirtieth resistor, a second terminal of the thirteenth capacitor, an emitter electrode of the first NPN triode, an emitter electrode of the second NPN triode and an anode of the voltage stabilizing diode are jointly grounded;

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 gate electrode of the second NMOS transistor and a gate electrode of the third NMOS transistor are jointly grounded;

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 jointly 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.

2-7. -7. (canceled)

8. A charging apparatus for an electronic device, comprising a power adapter and a charging control circuit, wherein the power adapter is coupled to a communication interface of the electronic device via a communication interface thereof, and charges a battery in the electronic device;

the charging control circuit is coupled to the power adapter via the communication interface of the electronic device;

after the power adapter is powered on or reset, the power adapter switches off direct current output thereof and detects an output voltage thereof;

if the output voltage of the power adapter is greater than a voltage threshold, the power adapter continues to judge the output voltage thereof;

if the output voltage of the power adapter is not greater than the voltage threshold, the power adapter switches on the direct current output thereof, sets the output voltage thereof as a conventional output voltage, and detects an output current thereof;

if the output current of the power adapter is within a conventional current range for a preset time period, the power adapter performs a quick charge inquiry communication with the charging control circuit;

after the charging control circuit sends a quick charge command to the power adapter, the power adapter adjusts the output voltage thereof according to battery voltage information fed back by the charging control circuit; and

if the output voltage of the power adapter meets a voltage requirement for quick charge predefined by the charging control circuit, the power adapter adjusts the output voltage and the output current thereof so as to output the direct current according to a quick charge voltage value and a quick charge current value.

9-10. -10. (canceled)

26. An electronic device, comprising a communication interface, a charging control circuit and a battery, wherein

each of the charging control circuit and the battery is coupled to a communication interface of a power adapter via the communication interface of the electronic device, such that the power adapter communicates with the charging control circuit and charges the battery;

the charging control circuit is further coupled to an electrode of the battery and configured to detect a voltage of the battery;

the charging control circuit is further configured to determine whether the battery meets a quick charge condition after receiving a quick charge inquiry message from the power adapter, and to feed back a quick charge command and battery voltage information to the power adapter if the battery meets the quick charge condition;

the charging control circuit is further configured to receive output voltage information sent by the power adapter, to determine whether an output voltage of the power adapter meets a preset voltage requirement for quick charge according to the output voltage information, and to send a command for starting a quick charge to the power adapter if the output voltage of the power adapter meets the preset voltage requirement for quick charge.

27. The electronic device of claim 26, wherein,

the charging control circuit is further configured to stop introducing direct current from the power adapter and send a quick charge stop command to the power adapter for switching from a quick charge mode to a convention charge mode, if the voltage of the battery is greater than a quick charge voltage threshold.

28. The electronic device of claim 26, 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 triode, a fourth NMOS transistor and a fifth NMOS transistor;

the battery connector is coupled to an electrode of the battery;

a first pin and a second pin of the battery connector are jointly grounded;

a first ground pin and a second ground pin of the battery connector are jointly 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, 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 both grounded;

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 both 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 configured to 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;

the sixth input/output pin and the twelfth input/output pin of the main controller are coupled to a first communication terminal and a 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 jointly coupled to a tenth input/output terminal of the main controller;

a second terminal of the thirty-seventh resistor is coupled to the power pin of the main controller;

a second terminal of the thirty-eighth resistor is coupled to a base electrode of the third NPN triode;

a fifth input/output terminal 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 jointly 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 jointly 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 electrode of the third NPN triode is coupled to a gate electrode of the fourth NMOS transistor and a gate electrode of the fifth NMOS transistor;

a second terminal of the fortieth resistor and a second terminal of the fifteenth capacitor are jointly grounded;

a source electrode of the fourth NMOS transistor is coupled to an anode of the first Schottky diode, and also coupled to a seventh pin and an 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 the communication interface of the electronic device;

an emitter electrode of the third NPN triode is coupled to an anode of the third Schottky diode, and a cathode of the third Schottky diode is grounded.

29. The electronic device of claim 28, 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 the 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 the collector electrode of the third NPN triode, a gate electrode of the sixth NMOS transistor and a gate electrode of the seventh NMOS transistor are jointly coupled to a first terminal of the forty-first resistor, and a second terminal of the forty-first resistor is grounded.