Battery charging apparatus and battery charging protection control method

Patent metadata

Field	Value
Publication number	US-11545843-B2
Application number	US-201916572071-A
Country	US
Kind code	B2
Filing date	Sep 16, 2019
Priority date	Jan 28, 2014
Publication date	Jan 3, 2023
Grant date	Jan 3, 2023

Abstract

The present disclosure provides a battery charging apparatus and a battery charging protection control method. A power adapter in the battery charging apparatus performs data communication with a charging control circuit; when the power adapter determines that overvoltage and/or overcurrent occurs in the direct current output by a communication interface of the power adapter, the power adapter notifies the charging control circuit to drive a controller in the electronic device to switch off a communication interface of the electronic device and switches off the direct current output automatically; when the charging control circuit determines that overvoltage and/or overcurrent occurs upon receiving output voltage and output current of the power adapter, the charging control circuit notifies the power adapter to switch off the direct current output and drives the controller in the electronic device to switch off the communication interface of the electronic device.

First claim

What is claimed:

1. A power adapter, comprising:
a first communication interface; and
a main control circuit, configured to:
control the first communication interface to output direct current to charge an electronic device;
when an output voltage of the first communication interface is greater than a voltage threshold and/or an output current of the first communication interface is greater than a current threshold, control the first communication interface to switch off the direct current output, and send a first charging stop command via the first communication interface, wherein the first charging stop command is configured to indicate the electronic device to switch off a second communication interface of the electronic device;
send output voltage information of the first communication interface and output current information of the first communication interface to the electronic device; and
control the first communication interface to switch off the direct current output when receiving a second charging stop command fed back by the electronic device, wherein the second charging stop command is fed back when the electronic device determines that the output voltage of the first communication interface is greater than the voltage threshold and/or the output current of the first communication interface is greater than the current threshold according to the output voltage information and the output current information.

2. The power adapter according to claim 1 , further comprising an output switch circuit, wherein,
the main control circuit is configured to output a switching off signal to the output switch circuit when the output voltage of the first communication interface is greater than the voltage threshold and/or the output current of the first communication interface is greater than the current threshold; and
the output switch circuit is configured to switch off the first communication interface according to the switching off signal to switch off the direct current output.

3. The power adapter according to claim 2 , wherein the main control circuit is configured to output the switching off signal to the output switch circuit when receiving the second charging stop command.

4. The power adapter according to claim 1 , further comprising:
a current detection circuit, configured to detect the output current of the first communication interface, and output the detected output current to the main control circuit.

5. The power adapter according to claim 1 , further comprising:
a voltage detection circuit, configured to detect the output voltage of the first communication interface, and output the detected output voltage to the main control circuit.

6. The power adapter according to claim 1 , wherein the power adapter supports a first charging mode and a second charging mode, a charging speed of the first charging mode is greater than a charging speed of the second charging mode.

7. The power adapter according to claim 6 , wherein the main control circuit is configured to:
send a mode switching instruction when a preset condition is satisfied, wherein the mode switching instruction is configured to control to switch from the first charging mode to the second charging mode.

8. The power adapter according to claim 7 , wherein the preset condition comprises at least one of:
charging of a battery to be charged of the electronic device being completed using the first charging mode; and
a temperature of the battery to be charged being greater than a preset temperature threshold.

9. An electronic device, comprising:
a second communication interface; and
a charging control circuit, wherein the charging control circuit is coupled to a battery in the electronic device and the second communication interface, the charging control circuit is configured to receive a first charging stop command sent from the power adapter via the second communication interface, and to drive the second communication interface to switch off according to the first charging stop command to switch off a direct current receiving interface, the first charging stop command is sent by the power adapter when the power adapter determines that an output voltage of the power adapter is greater than a voltage threshold and/or an output current of the power adapter is greater than a current threshold, and that it is need to switch off the direct current output of the power adapter;
the charging control circuit is further configured to:
receive output voltage information and output current information of the power adapter via the second communication interface; and
when determining that the output voltage of power adapter is greater than the voltage threshold and/or the output current of power adapter is greater than the current threshold according to the output voltage information and the output current information, switch off the direct current receiving interface, and send a second charging stop command via the second communication interface.

10. A battery charging system, comprising a power adapter and a charging control device, wherein,
the power adapter comprises: a first communication interface; and
a main control circuit, configured to:
control the first communication interface to output direct current to charge an electronic device;
when an output voltage of the first communication interface is greater than a voltage threshold and/or an output current of the first communication interface is greater than a current threshold, control the first communication interface to switch off the direct current output, and send a first charging stop command via the first communication interface, wherein the first charging stop command is configured to indicate the electronic device to switch off a second communication interface of the electronic device;

the charging control device comprises: a second communication interface; and
a charging control circuit, wherein the charging control circuit is coupled to a battery in the electronic device and the second communication interface, the charging control circuit is configured to receive the first charging stop command sent from the power adapter via the second communication interface, and to drive the second communication interface to switch off according to the first charging stop command to switch off a direct current receiving interface, the first charging stop command is sent by the power adapter when the power adapter determines that the output voltage of the power adapter is greater than the voltage threshold and/or the output current of the power adapter is greater than the current threshold, and that it is need to switch off the direct current output of the power adapter;
the main control circuit is further configured to:
send output voltage information of the first communication interface and output current information of the first communication interface to the electronic device; and
control the first communication interface to switch off the direct current output when receiving a second charging stop command fed back by the electronic device, wherein the second charging stop command is fed back when the electronic device determines that the output voltage of the first communication interface is greater than the voltage threshold and/or the output current of the first communication interface is greater than the current threshold according to the output voltage information and the output current information.

11. The battery charging system according to claim 10 , wherein the power adapter further comprises an output switch circuit,
the main control circuit is configured to output a switching off signal to the output switch circuit when the output voltage of the first

Assignees

• Guangdong Oppo Mobile Telecommunications Corp Ltd

Inventors

• Zhang Jialiang
• Wu Kewei
• Cheng Wenqiang
• Hu Yuanxiang

Classifications

• H02J7/00

  Circuit arrangements for charging or discharging batteries or for supplying loads from batteries · CPC title

• H02J7/61

  against overcharge · CPC title

• H02J7/42

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

• H02J7/963

  in response to battery voltage gradient · CPC title

• H02J7/953

  in response to charge current gradient · CPC title