Charging device and terminal providing power with alternating current

Patent metadata

Field	Value
Publication number	US-10333331-B2
Application number	US-201816113167-A
Country	US
Kind code	B2
Filing date	Aug 27, 2018
Priority date	Feb 5, 2016
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

The present disclosure discloses a charging device and a terminal. The device includes: a charging receiving terminal configured to receive a first alternating current; a first rectifier configured to rectify the first alternating current and output a first voltage with a first pulsating waveform, a switch unit configured to modulate the first voltage according to a control signal to obtain a modulated first voltage, a transformer configured to output a plurality of voltages with pulsating waveforms according to the modulated first voltage, and a synthesizing unit configured to synthesize the plurality of voltages to output a second alternating current; and a central control module configured to output the control signal to the switch unit so as to adjust voltage and/or current of the second alternating current in response to a charging requirement of the battery.

First claim

What is claimed is:

1. A charging device, comprising:
a charging receiving terminal, configured to receive a first alternating current from a mains supply;
a first rectifier, configured to rectify the first alternating current from the mains supply and to output a voltage with a first pulsating waveform;
a switch unit, configured to modulate the voltage with the first pulsating waveform according to a control signal;
a transformer, configured to output a plurality of voltages with pulsating waveforms according to the modulated voltage with the first pulsating waveform; and
a synthesizing unit, configured to synthesize the plurality of voltages with the pulsating waveforms to output a second alternating current; wherein an output end of the synthesizing unit is configured to be coupled to a battery such that the second alternating current is applied to the battery directly, and for each cycle of the second alternating current, a peak voltage of a positive half is greater than an absolute value of a valley voltage of a negative half; and
a central control module, configured to output the control signal to the switch unit so as to adjust at least one of a voltage and a current of the second alternating current outputted by the synthesizing unit, in response to a charging requirement of the battery.

2. The charging device according to claim 1 , wherein the transformer comprises a primary winding, a first secondary winding and a second secondary winding, a first end of the primary winding is coupled to a first output end of the first rectifier, a second end of the primary winding is coupled to the switch unit, the first secondary winding and the second secondary winding both are coupled to the synthesizing unit, and the transformer is configured to output a second voltage with a second pulsating waveform via the first secondary winding according to the modulated first voltage and to output a third voltage with a third pulsating waveform via the second secondary winding according to the modulated first voltage, and the synthesizing unit is configured to composite the second voltage and the third voltage to output the second alternating current.

3. The charging device according to claim 1 , wherein the charging device further comprises:
a sampling unit, configured to sample at least one of the voltage and the current of the second alternating current to obtain at least one of a voltage sampling value and a current sampling value,
the central control module is further configured to adjust a duty ratio of the control signal according to the at least one of the voltage sampling value and the current sampling value, in response to the charging requirement.

4. The charging device according to claim 3 , wherein the central control module is further configured to adjust a frequency of the control signal according to the at least one of the voltage sampling value and the current sampling value.

5. The charging device according to claim 3 , wherein the central control module is further configured to switch the switch unit off when the voltage sampling value is greater than a first predetermined voltage value.

6. The charging device according to claim 3 , wherein the central control module is further configured to switch the switch unit off when the current sampling value is greater than a predetermined current value.

7. The charging device according to claim 1 , wherein the central control module is further configured to determine a charging mode for charging the battery, in which the charging mode comprises a first charging mode and a second charging mode, a charging speed of the first charging mode is different from that of the second charging mode.

8. The charging device according to 1 , wherein the synthesizing unit comprises:
two controllable switch circuits; and
a control module, configured to control the two controllable switch circuits to switch on or off alternately.

9. The charging device according to 8 , wherein
when the control module controls a first one of the two controllable switch circuits to switch on and controls a second one of the two controllable switch circuits to switch off, the synthesizing unit is configured to output a first half cycle of the second alternating current; and
when the control module controls the first one of the two controllable switch circuits to switch off and controls the second one of the two controllable switch circuits to switch on, the synthesizing unit is configured to output a second half cycle of the second alternating current.

10. The charging device according to claim 1 , further comprising:
a driving unit, coupled between the switch unit and the central control module, and configured to drive the switch unit to switch on or off according to the control signal.

11. The charging device according to claim 1 , wherein the transformer further comprises: an auxiliary winding configured to generate a voltage with a fourth pulsating waveform according to the modulated voltage with the first pulsating waveform; the charging device further comprises: a power supply unit coupled to the auxiliary winding and configured to convert the voltage with the fourth pulsating waveform to output a direct current and to supply power to the central control module.

12. The charging device according to claim 11 , wherein the charging device further comprises:
a first voltage detecting unit, coupled to the auxiliary winding and the central control module, configured to detect the voltage with the fourth pulsating waveform to generate a voltage detecting value;
the central control module is further configured to adjust a duty ratio of the control signal according to the voltage detecting value.

13. The charging device according to claim 1 , further comprising:
a second sampling circuit, coupled to the central control module, configured to sample the voltage with the first pulsating waveform;
wherein the central control module is further configured to switch the switch unit on for a predetermined time period when the voltage sampled by the second sampling circuit is greater than a second predetermined voltage value.

14. The charging device according to claim 1 , further comprising: a controllable switch and a rectifying and filtering unit; wherein
the controllable switch is configured to control an operation of the rectifying and filtering unit;
the rectifying and filtering unit is configured to rectify and filter one of the plurality of voltages with pulsating waveforms to output a second direct current;
wherein the central control module is further configured to:
control the rectifying and filtering unit to work by controlling the controllable switch and control the synthesizing unit to stop working, when determining a charging mode as a first charging mode;
control the rectifying and filtering unit to stop working by controlling the controllable switch and control the synthesizing unit to work, when determining a charging mode as a second charging mode;

wherein a charging speed of the first charging mode is different from that of the second charging mode.

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

16. The charging device according to claim 1 , wherein a peak voltage of the second alternating current is less than a peak voltage of the first alternating current, and a cycle of the second alternating current is greater than a cycle of the first alternating current.

17. The charging device according to claim 1 , wherein the charging device is positioned in a power

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