Charging system, charging method, and power adapter

Patent metadata

Field	Value
Publication number	US-10340717-B2
Application number	US-201715725055-A
Country	US
Kind code	B2
Filing date	Oct 4, 2017
Priority date	Feb 5, 2016
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

A charging system, a charging method, and a power adapter are provided. The power adapter includes a first rectification unit, a switch unit, a transformer, a second rectification unit, a first charging interface, a sampling unit, and a control unit. The control unit is configured to output a control signal to the switch unit, and adjust a duty ratio of the control signal based on a voltage sampling value and/or current sampling value sampled by the sampling unit, in which a voltage of a third pulsating waveform output from the second rectification unit meets the charging requirements.

First claim

What is claimed is:

1. A system for charging, comprising:
a first rectification unit, configured to rectify an input alternating current (AC) voltage and output a voltage of a first pulsating waveform;
a switch unit, configured to modulate the voltage of the first pulsating waveform according to a control signal;
a transformer, configured to output a voltage of a second pulsating waveform based on the voltage of the modulated first pulsating waveform;
a second rectification unit, configured to rectify the voltage of the second pulsating wave form and output a voltage of a third pulsating waveform;
a filter unit, configured to filter the voltage of the third pulsating waveform and output a second direct current (DC) voltage;
a controllable switch, configured to control whether the filter unit operates;
a first charging interface;
a sampling unit, configured to sample at least one of an output voltage or an output current of the second rectification unit to obtain at least one of a voltage sampling value or a current sampling value;
a control unit, coupled with the sampling unit, the switch unit, and the controllable switch, respectively, the control unit being configured to control the controllable switch to cause the filter unit to operate to
output the second DC voltage via the first charging interface;
control the controllable switch to cause the filter unit to stop operating to output the voltage of the third pulsating waveform via the first charging interface; and
output the control signal to the switch unit to adjust at least one of a duty ratio of the control signal based on the voltage sampling value or the current sampling value, wherein the voltage of the third pulsating waveform or the second DC voltage meets charging requirements; and

a second charging interface and a battery coupled with the second charging interface, wherein the second charging interface is configured to apply the voltage of the third pulsating waveform or the second DC voltage to the battery when the second charging interface is coupled to the first charging interface.

2. The system of claim 1 , wherein the control unit is configured to communicate via the first charging interface to determine a charging mode, the charging mode comprising a quick charging mode and a normal charging mode.

3. The system of claim 2 , further comprising a charging control switch and a controller, wherein the charging control switch is coupled between the second charging interface and the battery, and configured to control switching of a charging process of the battery under the control of the controller.

4. The system of claim 3 , wherein the battery is capable of being charged with the normal charging mode and the quick charging mode, wherein a charging current of the quick charging mode is greater than the charging current of the normal charging mode, the controller is configured to conduct two-way communication with the control unit, such that the system determines to charge a terminal with the quick charging mode, wherein the control unit controls the system to make outputs according to the charging current corresponding to the quick charging mode to charge the battery.

5. A power adapter, comprising:
a first rectification unit, configured to rectify an input alternating current (AC) voltage and output a voltage of a first pulsating waveform;
a switch unit, configured to modulate the voltage of the first pulsating waveform according to a control signal;
a transformer, configured to output a voltage of a second pulsating waveform based on the voltage of the modulated first pulsating waveform;
a second rectification unit, configured to rectify the voltage of the second pulsating wave form and output a voltage of a third pulsating waveform;
a filter unit, configured to filter the voltage of the third pulsating waveform and output a second direct current (DC) voltage;
a controllable switch, configured to control whether the filter unit operates;
a first charging interface, configured to apply the voltage of the third pulsating waveform or the second DC voltage to a battery of a terminal via a second charging interface of the terminal when the first charging interface is coupled with the second charging interface, wherein the second charging interface is coupled with the battery;
a sampling unit, configured to sample at least one of an output voltage or an output current of the second rectification unit to obtain at least one of a voltage sampling value or a current sampling value; and
a control unit, coupled with the sampling unit, the switch unit, and the controllable switch, respectively; the control unit being configured to
control the controllable switch to cause the filter unit to operate to output the second DC voltage via the first charging interface;
control the controllable switch to cause the filter unit to stop operating to output the voltage of the third pulsating waveform via the first charging interface; and
output the control signal to the switch unit to adjust at least one of a duty ratio of the control signal based on the voltage sampling value or the current sampling value, wherein the voltage of the third pulsating waveform or the second DC voltage meets charging requirements.

6. The power adapter of claim 5 , wherein the control unit is further configured to adjust a frequency of the control signal based on at least one of the voltage sampling value or the current sampling value.

7. The power adapter of claim 5 , wherein the control unit is coupled to the first charging interface and configured to communicate with the terminal via the first charging interface to acquire status information of the terminal.

8. The power adapter of claim 7 , wherein the control unit is further configured to adjust at least one of the duty ratio of the control signal based on the status information of the terminal, the voltage sampling value, or the current sampling value.

9. The power adapter of claim 5 , further comprising:
a driving unit, coupled between the switch unit and the control unit and configured to drive the switch unit to switch on or off according to the control signal.

10. The power adapter of claim 5 , wherein the sampling unit comprises:
a first current sampling circuit, configured to sample a current output from the second rectification unit to obtain the current sampling value; and
a first voltage sampling circuit, configured to sample a voltage output from the second rectification unit to obtain the voltage sampling value.

11. The power adapter of claim 10 , wherein the first voltage sampling circuit comprises:
a peak voltage sample-and-hold unit, configured to sample and hold a peak voltage of the voltage of the third pulsating waveform;
a zero-crossing point sampling unit, configured to sample a zero-crossing point of the voltage of the third pulsating waveform;
a bleeder unit, configured to bleed down the voltage of the peak voltage sample-and-hold unit at the zero-crossing point; and
an analog-digital (AD) sampling unit, configured to sample the peak voltage of the peak voltage sample-and-hold unit to obtain the voltage sampling value.

12. The power adapter of claim 5 , wherein the modulated first pulsating waveform is synchronized with the third pulsating waveform.

13. The power adapter of claim 5 , further comprising:
a second voltage sampling circuit, coupled with the control unit and configured to sample the voltage of the first pulsating waveform; and
the control unit being further configured to control the switch unit to switch on for a first preset time period for discharging, when a voltage value sampled by the second voltag

Assignees

• Guangdong Oppo Mobile Telecommunications Corp Ltd

Inventors

• Zhang Jialiang
• Chen Shebiao
• Zhang Jun
• Tian Chen
• Wan Shiming
• Li Jiada

Classifications

• H02J7/825

  Detection of fully charged condition · CPC title

• H02J7/94

  in response to battery current · CPC title

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H02J7/42

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

• H02J7/975

  in response to temperature · CPC title