Adapter and method for charging control

Patent metadata

Field	Value
Publication number	US-10644529-B2
Application number	US-201715739618-A
Country	US
Kind code	B2
Filing date	Jan 7, 2017
Priority date	Feb 5, 2016
Publication date	May 5, 2020
Grant date	May 5, 2020

Abstract

An adapter and a method for charging control are provided. The adapter includes a power converting unit, a sample and hold unit, a current acquisition and control unit. The power converting unit is configured to convert an input AC to obtain an output voltage and an output current of the adapter, and the output current of the adapter is a current of a first pulsating waveform. The sample and hold unit is connected to the power converting unit, and is configured to sample the current of the first pulsating waveform when the sample and hold unit is in a sample state and hold a peak value of the current of the first pulsating waveform when the sample and hold unit is in a hold state. The current acquisition and control unit is connected to the sample and hold unit.

First claim

What is claimed is:

1. An adapter, comprising:
a power converting unit, configured to convert an input alternating current (AC) to obtain an output voltage and an output current of the adapter, wherein the output current of the adapter is a current of a first pulsating waveform;
a sample and hold unit, connected to the power converting unit, and configured to sample the current of the first pulsating waveform when the sample and hold unit is in a sample state and hold a peak value of the current of the first pulsating waveform when the sample and hold unit is in a hold state; and
a current acquisition and control unit, connected to the sample and hold unit, and configured to determine whether the sample and hold unit is in the hold state and acquire the peak value of the current of the first pulsating waveform held by the sample and hold unit when the sample and hold unit is in the hold state.

2. The adapter of claim 1 , further comprising:
a voltage adjusting unit, connected to the power converting unit and configured to detect and adjust the output voltage of the adapter,
wherein the current acquisition and control unit is connected to the voltage adjusting unit and configured to adjust the peak value of the current of the first pulsating waveform via the voltage adjusting unit.

3. The adapter of claim 2 , wherein the voltage adjusting unit comprises:
a voltage dividing unit, having an input end connected to the power converting unit, and configured to divide the output voltage of the adapter by a voltage division ratio to generate a second voltage;
a voltage comparing unit, having an input end connected to an output end of the voltage dividing unit, and configured to compare the second voltage with a second reference voltage; and
a voltage control unit, having an input end connected to the input end of the voltage comparing unit and an output end connected to the power converting unit, and configured to control the output voltage of the adapter based on a comparison result between the second voltage and the second reference voltage,
the current acquisition and control unit being connected to the voltage comparing unit and configured to adjust the peak value of the current of the first pulsating waveform through adjusting the voltage division ratio.

4. The adapter of claim 3 , wherein the current acquisition and control unit comprises a control unit, and the voltage dividing unit comprises a digital potentiometer; the digital potentiometer having a high-potential end connected to the power converting unit, a low-potential end grounded, and an output end connected to the voltage comparing unit; the control unit is connected to a control end of the digital potentiometer and configured to adjust the voltage division ratio of the digital potentiometer via the control end of the digital potentiometer, so as to adjust the peak value of the current of the first pulsating waveform.

5. The adapter of claim 1 , wherein the current acquisition and control unit is configured to receive a sync signal and determine based on the sync signal whether the sample and hold unit is in the hold state, wherein the period of the sync signal is 1/N of the period of the first pulsating waveform, and wherein N is an integer greater than or equal to one.

6. The adapter of claim 5 , wherein the current acquisition and control unit is configured to determine based on the sync signal whether the first pulsating waveform is on the peak or falling edge and acquire the peak value of the current of the first pulsating waveform held by the sample and hold unit when the first pulsating waveform is on the peak or falling edge.

7. The adapter of claim 6 , wherein the current acquisition and control unit comprises:
a comparator and a control unit, wherein the comparator has a first input end configured to receive the sync signal and a second input end configured to receive a reference voltage, the control unit is connected to an output end of the comparator and configured to determine based on a comparison result between the voltage of the sync signal and the reference voltage whether the first pulsating waveform is on the peak or falling edge.

8. The adapter of claim 1 , wherein the current acquisition and control unit is further configured to control the sample and hold unit to switch from the hold state to the sample state after the current acquisition and control unit acquires the peak value of the current of the first pulsating waveform.

9. The adapter of claim 8 , wherein the sample and hold unit comprises a capacitor and is configured to hold the peak value of the current of the first pulsating waveform based on the capacitor of the sample and hold unit, and
wherein the current acquisition and control unit comprises a discharging unit and a control unit, the discharging unit is connected to the control unit and the capacitor of the sample and hold unit respectively and configured to release the charge across the capacitor of the sample and hold unit under the control of the control unit, whereby the sample and hold unit switches from the hold state to the sample state.

10. The adapter of claim 1 , wherein the sample and hold unit comprises:
a current sampling unit, connected to the power converting unit, and configured to detect the current of the first pulsating waveform to obtain a sampling current and convert the sampling current to a sampling voltage, wherein the sampling voltage is configured to indicate the magnitude of the current of the first pulsating waveform; and
a current holding unit, connected to the current sampling unit and the current acquisition and control unit, and configured to receive the sampling voltage from the current sampling unit and charge the capacitor of the current holding unit based on the sampling voltage,
wherein the current acquisition and control unit is configured to acquire the peak value of the current of the first pulsating waveform by detecting a voltage across the capacitor of the sample and hold unit.

11. The adapter of claim 1 , the adapter being operable in a first charging mode and a second charging mode, wherein charging speed of a device to be charged by the adapter in the second charging mode is faster than the charging speed of the device to be charged by the adapter in the first charging mode, wherein the current of the first pulsating waveform is the output current of the adapter in the second charging mode, and wherein the adapter comprises a control unit, which is configured to perform two-way communication with the device to be charged to control the output of the adapter in the second charging mode, when the adapter is connected to the device to be charged.

12. The adapter of claim 11 , wherein the control unit configured to perform two-way communication with the device to be charged to control the output of the adapter in the second charging mode is configured to:
perform two-way communication with the device to be charged to negotiate a charging mode between the adapter and the device to be charged.

13. The adapter of claim 11 , wherein the control unit configured to perform two-way communication with the device to be charged to control the output of the adapter in the second charging mode is configured to:
perform two-way communication with the device to be charged, to determine a charging voltage, which is output from the adapter in the second charging mode for charging the device to be charged; and
the control unit is configured to adjust the output voltage of the adapter, whereby the output voltage of the adapter is equal to the charging voltage that is output from the adapter in the second charging mode for charging

Assignees

• Guangdong Oppo Mobile Telecommunications Corp Ltd

Inventors

• Tian Chen
• Zhang Jialiang

Classifications

• H01M10/425

  Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00) · CPC title

• H02J7/06

  using discharge tubes or semiconductor devices · CPC title

• H02M3/33592

  having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer · CPC title

• H02M3/33523

  with galvanic isolation between input and output of both the power stage and the feedback loop · CPC title

• H01M2010/4271

  Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing · CPC title