Charging control method and apparatus

Patent metadata

Field	Value
Publication number	US-10622829-B2
Application number	US-201715725064-A
Country	US
Kind code	B2
Filing date	Oct 4, 2017
Priority date	Feb 5, 2016
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

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 a 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. The terminal includes a second charging interface and a battery. The second charging interface is coupled with the battery. When the second charging interface is coupled to the first charging interface, the second charging interface applies the voltage of the third pulsating waveform to the battery.

First claim

What is claimed is:

1. A system for charging, comprising:
a first rectification unit, configured to rectify an input alternating current (AC) and output a voltage of a first pulsating waveform;
a switch unit, configured to be in a switch-on state or a switch-off state according to a control signal to modulate the voltage of the first pulsating waveform, to obtain a modulated first pulsating waveform;
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 waveform and output a voltage of a third pulsating waveform, and configured to achieve synchronous rectification at the secondary side in a manner that the third pulsating waveform is synchronized with the modulated first pulsating waveform, wherein the third pulsating waveform being synchronized with the modulated first pulsating waveform comprises: the phase of the third pulsating waveform being consistent with that of the modulated first pulsating waveform;
a first charging interface, coupled with the second rectification unit;
a sampling unit, configured to synchronously sample an output voltage of the second rectification unit;
a control unit, coupled with the sampling unit and the switch unit respectively, wherein the control unit is configured to
output the control signal to the switch unit such that the sampling unit synchronously samples the voltage output from the second rectification unit to obtain a phase of the voltage of the first pulsating waveform;
adjust a frequency of the control signal according to the phase of the voltage of the first pulsating waveform to adjust a switch-on time and a switch-off time of the switch unit, such that a phase of a voltage of the modulated first pulsating waveform is consistent with a phase of a current of the modulated first pulsating waveform;
adjust a duty ratio of the control signal such that the voltage of the third pulsating waveform 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 to the battery when the second charging interface is coupled to the first charging interface.

2. The system of claim 1 , wherein the system further comprises a charge control switch and a controller, and the charge control switch is coupled between the second charging interface and the battery, and configured to control switching of the charging of the battery under the control of the controller.

3. The system of claim 1 , wherein the battery is capable of being charged with a first charging mode and a second charging mode, wherein
a charging current of the second charging mode is greater than the charging current of the first charging mode,
a controller is configured to conduct two-way communication with the control unit, such that the system determines to charge the battery with the second charging mode, and
the control unit controls the system to make outputs according to the charging current corresponding to the second charging mode to charge the battery.

4. A power adapter, comprising:
a first rectification unit, configured to rectify an input alternating current (AC) and output a voltage of a first pulsating waveform;
a switch unit, configured to be in a switch-on state or a switch-off state according to a control signal to modulate the voltage of the first pulsating waveform, to obtain a modulated first pulsating waveform;
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, and configured to achieve synchronous rectification at the secondary side in a manner that the third pulsating waveform is synchronized with the modulated first pulsating waveform, wherein the third pulsating waveform being synchronized with the modulated first pulsating waveform comprises: the phase of the third pulsating waveform being consistent with that of the modulated first pulsating waveform;
a first charging interface, coupled with the second rectification unit and configured to apply the voltage of the third pulsating waveform 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 synchronously sample an output voltage of the second rectification unit; and
a control unit, coupled with the sampling unit and the switch unit respectively wherein the control unit is configured to
output the control signal to the switch unit such that the sampling unit synchronously samples the voltage output from the second rectification unit to obtain a phase of the voltage of the first pulsating waveform;
adjust a frequency of the control signal according to the phase of the voltage of the first pulsating waveform to adjust a switch-on time and a switch-off time of the switch unit, such that a phase of a voltage of the modulated first pulsating waveform is consistent with a phase of a current of the modulated first pulsating waveform; and
adjust a duty ratio of the control signal such that the voltage of the third pulsating waveform meets charging requirements.

5. The power adapter of claim 4 , wherein the sampling unit is configured to sample at least one of the output voltage of the second rectification unit or an output current of the second rectification unit to obtain at least one of a voltage sampling value or a current sampling value, the control unit is configured to adjust a frequency of the control signal based on at least one of the voltage sampling value or the current sampling value.

6. 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.

7. The power adapter of claim 6 , wherein the control unit is further configured to adjust the duty ratio of the control signal based on at least one of the status information of the terminal, the voltage sampling value, or the current sampling value.

8. The power adapter of claim 4 , 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.

9. The power adapter of claim 8 , further comprising:
an auxiliary winding, configured to generate a voltage of a fourth pulsating waveform based on the voltage of the modulated first pulsating waveform; and
a power supply unit, coupled with the auxiliary winding and configured to convert the voltage of the fourth pulsating waveform and output a direct current (DC) to power at least one of the driving unit or the control unit.

10. The power adapter of claim 9 , further comprising:
a first voltage detecting unit, coupled with the auxiliary winding and the control unit, respectively, and configured to detect the voltage of the fourth pulsating waveform and generate a voltage detection value, wherein the control unit is further configured to adjust the duty ratio of the control signal based on the voltage detection value.

11. The power adapter of claim 4 , wherein the sampling unit comprises:
a first current sampling circuit, configured to sample a current output from the

Assignees

• Guangdong Oppo Mobile Telecommunications Corp Ltd

Inventors

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

Classifications

• H02J7/06

  using discharge tubes or semiconductor devices · CPC title

• H02J7/04

  Regulation of charging current or voltage · CPC title

• H02M3/156

  with automatic control of output voltage or current, e.g. switching regulators · CPC title

• H02J7/2434

  with pulse modulation · CPC title

• H01F27/425

  for voltage transformers · CPC title