Electronic device and power adapter, including main control circuit, therefor

Patent metadata

Field	Value
Publication number	US-10218192-B2
Application number	US-201415114929-A
Country	US
Kind code	B2
Filing date	May 12, 2014
Priority date	Jan 28, 2014
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

An electronic device and a power adapter are provided. The power adapter 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. When a conventional charging or a quick charging is performed on the battery in the electronic device, the main control circuit determines whether the output current of the power adapter is greater than a current threshold according to the current detecting signal and determines whether the output voltage of the power adapter is greater than a voltage threshold according to the voltage detecting signal; if the output current of the power adapter is greater than the current threshold and/or the output voltage of the power adapter is greater than the voltage threshold, the main control circuit controls the output switch circuit to turn off the direct current output of the power adapter.

First claim

What is claimed is:

1. A power adapter, comprising a communication interface through which the power adapter charges a battery in an electronic device and performs a data communication with the electronic device, an electromagnetic interference (EMI) filtering circuit, a high-voltage rectifying and filtering circuit, an isolation transformer, an output filtering circuit, and a voltage tracking and controlling circuit, wherein,
the power adapter further comprises a power circuit, a main control circuit, a potential adjusting circuit, a current detection circuit, a voltage detection circuit and an output switch circuit;
an input end of the power circuit is connected with a secondary end of the isolation transformer; a power end of the main control circuit, a power end of the potential adjusting circuit and a power end of the current detection circuit are collectively connected with an output end of the power circuit; both a high-level end of the main control circuit and a high-level end of the potential adjusting circuit are connected with a positive output end of the output filtering circuit; a potential adjusting end of the potential adjusting circuit is connected with the voltage tracking and controlling circuit; a direct current input end of the current detection circuit is connected with the positive output end of the output filtering circuit; a current feedback end of the current detection circuit is connected with a current detecting end of the main control circuit; a clock output end of the main control circuit is connected with a clock input end of the potential adjusting circuit; a data output end of the main control circuit is connected with a data input end of the potential adjusting circuit; a first detecting end and a second detecting end of the voltage detection circuit are connected with a direct current output end of the current detection circuit and a negative output end of the output filtering circuit respectively; a first output end and a second output end of the voltage detection circuit are connected with a first voltage detecting end and a second voltage detecting end of the main control circuit respectively; an input end of the output switch circuit is connected with the direct current output end of the current detection circuit; an output end of the output switch circuit is connected with a third detecting end of the voltage detection circuit; a ground end of the output switch circuit is connected with the negative output end of the output filtering circuit; a controlled end of the output switch circuit is connected with a switching control end of the main control circuit; a power end of the output switch circuit is connected with the secondary end of the isolation transformer; each of the negative output end of the output filtering circuit, the output end of the output switch circuit and a first communication end and a second communication end of the main control circuit is connected with the communication interface;
the power circuit obtains power supply from the isolation transformer and provides the power supply for the main control circuit, the potential adjusting circuit and the current detection circuit; when a quick charging is performed on the battery in the electronic device, the potential adjusting circuit drives the voltage tracking and controlling circuit to adjust an output voltage of the isolation transformer according to a control signal sent by the main control circuit; the current detection circuit detects an output current of the power adapter and feeds back a current detecting signal to the main control circuit, and the voltage detection circuit detects an output voltage of the power adapter and feeds back a voltage detecting signal to the main control circuit; the output switch circuit turns on or off a direct current output of the power adapter according to a switching control signal sent by the main control circuit;
when a conventional charging or a quick charging is performed on the battery in the electronic device, the main control circuit determines whether the output current of the power adapter is greater than a current threshold according to the current detecting signal and determines whether the output voltage of the power adapter is greater than a voltage threshold according to the voltage detecting signal; if the output current of the power adapter is greater than the current threshold and/or the output voltage of the power adapter is greater than the voltage threshold, the main control circuit controls the output switch circuit to turn off the direct current output of the power adapter;
during the data communication between the main control circuit and the electronic device, if the electronic device determines that the output current of the power adapter is greater than the current threshold and/or the output voltage of the power adapter is greater than the voltage threshold, and feeds back a charging stop instruction to the main control circuit, the main control circuit controls the output switch circuit to turn off the direct current output of the power adapter according to the charging stop instruction.

2. The power adapter according to claim 1 , wherein,
the power circuit comprises: a first capacitor, a voltage stabilizing chip, a second capacitor, a first inductor, a second inductor, a fist diode, a second diode, a third capacitor, a first resistor and a second resistor;
a collective node of a first end of the first capacitor, an input power pin and an enable pin of the voltage stabilizing chip is configured as the input end of the power circuit, a second end of the first capacitor and a ground pin of the voltage stabilizing chip are collectively grounded, a switch pin of the voltage stabilizing chip and a first end of the second capacitor are collectively connected with a first end of the first inductor; an inside switch pin of the voltage stabilizing chip and a second end of the second capacitor are collectively connected with a cathode of the first diode; a feedback voltage pin of the voltage stabilizing chip is connected with a first end of the first resistor and a first end of the second resistor respectively; a second end of the first inductor and a cathode of the second diode are collectively connected with a first end of the second inductor; a collective node formed by collectively connecting a second end of the second inductor, an anode of the first diode, a second end of the first resistor and a first end of the third capacitor is configured as the output end of the power circuit, an anode of the second diode, a second end of the second resistor and a second end of the third capacitor are collectively grounded.

3. The power adapter according to claim 2 , wherein,
the power circuit outputs a voltage of +3.3V for providing power supply for the main control circuit, the potential adjusting circuit and the current detection circuit, after using the voltage stabilizing chip as a core to perform a voltage converting process on a voltage at the secondary end of the isolation transformer.

4. The power adapter according to claim 2 , wherein,
the voltage stabilizing chip is a buck direct current/direct current (DC/DC) converter.

5. The power adapter according to claim 1 , 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 N-metal-oxide-semiconductor (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 end 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

Assignees

• Guangdong Oppo Mobile Telecommunications Corp Ltd

Inventors

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

Classifications

• H02J4/25

  for transfer of electric power between AC and DC networks, e.g. for supplying the DC section within a load from an AC mains system · CPC title

• H02J7/663

  using battery or load disconnect circuits (H02J9/002 takes precedence) · CPC title

• H02J7/485

  with provisions for charging different types of batteries · CPC title

• H02J7/90 Primary

  Regulation of charging or discharging current or voltage · CPC title

• H02J7/62

  against overcurrent · CPC title