Charging device and method, power adapter and terminal

Patent metadata

Field	Value
Publication number	US-10790696-B2
Application number	US-201715646174-A
Country	US
Kind code	B2
Filing date	Jul 11, 2017
Priority date	Feb 5, 2016
Publication date	Sep 29, 2020
Grant date	Sep 29, 2020

Abstract

The present disclosure discloses a charging device, a charging method, a power adapter and a terminal. The charging device includes a charging receiving terminal, a voltage adjusting circuit and a central control module. The charging receiving terminal is configured to receive an alternating current. The voltage adjusting circuit includes a first rectifier, a switch unit, a transformer and a second rectifier. The first rectifier is configured to rectify the alternating current and output a first voltage. The switch unit is configured to modulate the first voltage to output a modulated first voltage. The transformer is configured to output a second voltage according to the modulated first voltage. The second rectifier is configured to rectify the second voltage to output a third voltage. The voltage adjusting circuit applies the third voltage to a battery directly.

First claim

What is claimed is:

1. A charging device, comprising:
a charging receiving terminal, configured to receive an alternating current;
a voltage adjusting circuit, having an input end coupled to the charging receiving terminal, and comprising:
a first rectifier, configured to rectify the alternating current to output a first voltage with a first ripple waveform;
a switch unit, configured to modulate the first voltage without filtering according to a control signal to output a modulated first voltage;
a transformer, configured to output a second voltage with a second ripple waveform according to the modulated first voltage without filtering;
a second rectifier, configured to rectify the second voltage to output a third voltage with a third ripple waveform; and
a controllable switch and a filtering unit in series, wherein the controllable switch and the filtering unit are coupled to an output end of the second rectifier;
an output end configured to be coupled to a battery; and
a central control module, configured to output the control signal to the switch unit so as to adjust voltage and/or current outputted by the voltage adjusting circuit, in response to a charging requirement of the battery;
wherein, the central control module is further configured to control the controllable switch to switch on to incorporate the filtering unit into the voltage adjusting circuit for filtering the third voltage to output direct current to the battery when determining a charging mode as a first charging mode;
wherein the central control module is further configured to control the controllable switch to switch off when determining the charging mode as a second charging mode to directly apply the third voltage without filtering to the battery;
wherein the charging mode comprises the first charging mode and the second charging mode, and the second charging mode is different from the first charging mode.

2. The charging device according to claim 1 , wherein the working frequency of the transformer ranges from 50 KHz to 2 MHz.

3. The charging device according to claim 1 , wherein a waveform of the modulated first voltage keeps synchronous with the third ripple waveform.

4. The charging device according to claim 1 , wherein the voltage adjusting circuit employs any one of a flyback switching power supply, a forward switching power supply, a push-pull switching power supply, a half-bridge switching power supply and a full-bridge switching power supply.

5. The charging device according to claim 1 , wherein the charging device is configured to be built in a power adapter.

6. The charging device according to claim 5 , wherein the charging device is configured to communicate with a terminal to determine the charging mode.

7. The charging device according to claim 6 , wherein when determining the charging mode as the second charging mode, the control unit is configured to obtain status information of the terminal via communication, and to obtain a charging current and/or a charging voltage corresponding to the second charging mode according to the status information of the terminal, so as to adjust the duty ratio of the control signal according to the charging current and/or the charging voltage corresponding to the second charging mode.

8. The charging device according to claim 1 , wherein the charging device is configured to be built in a terminal.

9. The charging device according to claim 8 , wherein the charging device is configured to communicate with a power adapter, so as the power adapter obtain the charging mode.

10. The charging device according to claim 9 , wherein when determining the charging mode as the second charging mode, the control unit is configured to obtain status information of the terminal, and to obtain a charging current and/or a charging voltage corresponding to the second charging mode according to the status information of the terminal, so as to adjust the duty ratio of the control signal according to the charging current and/or the charging voltage corresponding to the second charging mode.

11. A charging method, comprising:
receiving an alternating current;
rectifying the alternating current to output a first voltage with a ripple waveform, and modulating the first voltage without filtering to obtain a modulated first voltage;
converting the modulated first voltage without filtering to a second voltage with a second ripple waveform, and rectifying the second voltage to output a third voltage with a third ripple waveform;
obtaining status information of the battery, and adjusting voltage and/or current applied to the battery according to the status information of the battery, in response to a charging requirement of the battery;
controlling a controllable switch to switch on to incorporate a filtering unit for filtering the third voltage to output direct current to the battery when determining a charging mode as a first charging mode, wherein the controllable switch and the filtering unit in series, are coupled to an output end of the second rectifier; and
controlling the controllable switch to switch off when determining the charging mode as a second charging mode, and directly outputting the third voltage without filtering to the battery;
wherein the charging mode comprises the first charging mode and the second charging mode, and the second charging mode is different from the first charging mode.

12. The charging method according to claim 11 , further comprising:
sampling a voltage sampling value and/or a current sampling value of the first voltage; and
adjusting voltage and/or current applied to the battery according to the voltage sampling value and/or the current sampling value.

13. The charging method according to claim 11 , wherein a waveform of the modulated first voltage keeps synchronous with the third ripple waveform.

14. The charging method according to claim 11 , further comprising:
determining a charging mode, in which the charging mode comprises a first charging mode and a second charging mode and the second charging mode is different from the first charging mode.

15. The charging method according to claim 11 , wherein when determining the charging mode as the second charging mode, the method further includes:
obtaining status information of the battery;
obtaining a charging current and/or a charging voltage corresponding to the second charging mode according to the status information of the terminal; and
adjusting the duty ratio of the control signal according to the charging current and/or the charging voltage corresponding to the second charging mode.

16. The charging method according to claim 12 , further comprising:
when the voltage sampling value is greater than a predetermined voltage value, or the current sampling value is greater than a predetermined current value, stopping applying the third voltage to a battery.

17. A power adapter, comprising:
a first rectifier, configured to rectify an inputting alternating current and output a first voltage with a first ripple waveform;
a switch unit, configured to modulate the first voltage without filtering according to a control signal to output a modulated first voltage;
a transformer, configured to output a second voltage with a second ripple waveform according to the modulated first voltage without filtering;
a second rectifier, configured to rectify the second voltage to output a third voltage with a third ripple waveform to a battery of a terminal; and
a controllable switch and a filtering unit in series, wherein the controllable switch and the filtering unit are coupled to

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