Power adapter, electronic device, and charging apparatus for electronic device

Patent metadata

Field	Value
Publication number	US-10224725-B2
Application number	US-201415113973-A
Country	US
Kind code	B2
Filing date	May 12, 2014
Priority date	Jan 28, 2014
Publication date	Mar 5, 2019
Grant date	Mar 5, 2019

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.

First claim

What is claimed is:

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 first output voltage, and detect an output current thereof;
if the output current is within a first 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.

2. 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.

3. 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.

4. The power adapter of claim 3 , 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.

5. The power adapter of claim 2 , 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.

6. The power adapter of claim 2 , 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.

7. The power adapter of claim 5 , 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 ele

Assignees

• Guang Dong Oppo Mobile Telecomm Corp Ltd
• Guangdong Oppo Mobile Telecommunications Corp Ltd

Inventors

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

Classifications

• H02J7/685

  using connection detecting circuits (H02J7/68 takes precedence) · CPC title

• H02J7/94

  in response to battery current · CPC title

• H02J7/68

  using circuits for correcting or protecting against reverse-polarity · 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