CHARGING CONTROL APPARATUS AND METHOD FOR ELECTRONIC DEVICE

• US 20160344218A1
• Filed: 05/06/2014
• 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, HUANG, Dashuai, HU, Yuanxiang
• Granted Patent: US 10,291,050 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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. In the process of charging a battery by the charging control apparatus for the electronic device, first, a power adapter charges the battery with a constant-voltage output direct current; after receiving a fast charge command sent by a charging control module, the power adapter adjusts the output voltage according to a battery voltage fed back by the charging control module; when the output voltage meets a fast charge voltage condition preset by the charging control module, the power adapter adjusts the output current and the output voltage according to a fast charge current value and a fast charge voltage value so as to perform fast charge on the battery; and during the fast charge, the power adapter further adjusts the output current in real time according to its output voltage and the battery voltage, so that fast charge of the battery is accomplished by adjusting the output current and the output voltage of the power adapter.

Claims

1. A charging control apparatus for an electronic device, being characterized at that, the charging control apparatus for the electronic device comprises a power adapter and a charging control module;

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

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

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

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 module, the power adapter adjusts an output voltage according to the voltage of the battery fed back by the charging control module, and if the output voltage meets a quick-charging voltage condition pre-set by the charging control module, 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 module introduces direct current from the power adapter for charging the battery;

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 the electronic device according to claim 1, being characterized at that, 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 module, a main control module, a potential adjustment module, a current detection module, a voltage detection module and an output switch module;

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

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

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

the main control module 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 module continues to detect and determine the output voltage of the power adapter, and if no, the main control module controls the output switch module to switch on the direct current output of the power adapter, and drives the voltage tracking and control module via the potential adjustment module to set the output voltage of the isolation transformer as a conventional output voltage;

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

if the main control module 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 module performs a quick-charging inquiry communication with the charging control module;

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

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

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

the power module 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 module, 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 module, 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 the electronic device according to claim 2, being characterized at that,

the main control module 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 module, 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 module, 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 module, 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 module, 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 module 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 module 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 module respectively.

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

the potential adjustment module 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 module, 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 module, 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 module, 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 module, and a potential tap pin of the digital potentiometer is configured as the potential adjustment terminal of the potential adjustment module.

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

the current detection module 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 module 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 module, 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 module, 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 the electronic device according to claim 2, being characterized at that,

the voltage detection module 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 module, 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 module, a second terminal of the twenty-sixth resistor is configured as the second detection terminal of the voltage detection module, 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 module, and a second terminal of the twenty-eighth resistor is configured as the third detection terminal of the voltage detection module.

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

the output switch module 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 module, 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 module, 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 module, a drain electrode of the second NMOS transistor is configured as the input terminal of the output switch module, 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 module.

9. The charging control apparatus for the electronic device according to claim 1 or 2, being characterized at that,

the charging control module 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 module 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 the electronic device according to claim 9, being characterized at that,

the charging control module 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.

11. A charging control method for an electronic device, based on claim 1, and being characterized at that, the charging control method for the electronic device comprises steps of:

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

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

C. if the output voltage meets a quick-charging voltage condition pre-set by the charging control module, 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 module for charging the battery;

D. 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, being characterized at that, after step B, the method further comprises steps of:

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

13. The charging control method for the electronic device according to claim 11 or 12, being characterized at that, firstly charging the battery by the power adapter with the constant-voltage direct-current output in step A 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 the electronic device according to claim 11 or 12, being characterized at that, adjusting an output voltage by the power adapter according to a voltage of the battery fed back by the charging control module in step B comprises:

calculating, by the power adapter, a sum of the voltage of the battery fed back by the charging control module 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 the electronic device according to claim 11 or 12, being characterized at that, step D 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 module;

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 module.