Charging circuit and control method therefor

• US 9,509,150 B2
• Filed: 08/22/2012
• Issued: 11/29/2016
• Est. Priority Date: 05/23/2012
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Liu, Jiajun, Wang, Jihong
• Primary Examiner(s): LIN, SUN J
• Application Number:
  US14/402,848
• Publication Number:
  US 20150326036A1
• Time in Patent Office: 1,560 Days
• Field of Search: 320/162
• US Class Current: 1/1
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/00714 in response to battery charging or discharging current

Abstract

A charging circuit and a control method for charging different brands of mobile devices are disclosed. The charging circuit comprises: a universal interface connected to a mobile device to be charged; a charging adaptation unit comprising at least two types of charging circuitries, wherein the charging adaptation unit is connected to the universal interface and configured to provide a corresponding charging circuitry for the mobile device; a voltage conversion unit connected to a charging power source and configured to adjust an output voltage of the charging power source to a charging voltage for the mobile device; and a current detection unit connected between the voltage conversion unit and the charging adaptation unit and configured to detect a charging current, wherein the charging current is configured to determine the corresponding charging circuitry for the mobile device. The charging circuit and the control method thereof can charge different brands of mobile devices by means of a single universal interface, and can also charge a mobile device by means of another mobile device, which makes the use of mobile devices more convenient.

Claims

1. A charging circuit, the charging circuit including:

a universal interface connected to a mobile device to be charged;

a charging adaptation unit including at least two types of charging circuitries, wherein the charging adaptation unit is connected to the universal interface and configured to provide a corresponding charging circuitry for the mobile device;

a voltage conversion unit connected to a charging power source and configured to adjust an output voltage of the charging power source to a charging voltage for the mobile device; and

a current detection unit connected between the voltage conversion unit and the charging adaptation unit and configured to detect a charging current, wherein the detected charging current is configured to determine the corresponding charging circuitry for the mobile device.

2. The charging circuit according to claim 1, wherein the at least two types of charging circuitries include a first circuit and a second circuit, wherein the first circuit is a charging circuitry having a same voltage on two data pins, and the second circuit is a charging circuitry having different voltages on two data pins.

3. The charging circuit according to claim 2, wherein the charging circuit further includes:

a control unit, connected to the current detection unit, the charging adaptation unit and the voltage conversion unit respectively and configured to determine, according to a current value detected by the current detection unit, whether charging of the mobile device is completed, and control the charging adaptation unit and the voltage conversion unit to turn on and turn off.

4. The charging circuit according to claim 3, wherein the control unit includes:

a power source management chip, connected to the charging power source and the current detection unit respectively and configured to acquire the current value and acquire a power supply voltage provided by the charging power source for the control unit;

a main control chip, connected to the power source management chip and the voltage conversion unit and configured to send a control instruction according to the current value and control the voltage conversion unit to turn on and turn off; and

a switch control unit, connected to the main control chip and the charging adaptation unit respectively and configured to send a control instruction according to the current value and control the charging adaptation unit to turn on and turn off.

5. The charging circuit according to claim 1, wherein the charging circuit further includes:

a control unit, connected to the current detection unit, the charging adaptation unit and the voltage conversion unit respectively and configured to determine, according to a current value detected by the current detection unit, whether charging of the mobile device is completed, and control the charging adaptation unit and the voltage conversion unit to turn on and turn off.

6. The charging circuit according to claim 5, wherein the control unit includes:

a power source management chip, connected to the charging power source and the current detection unit respectively and configured to acquire the current value and acquire a power supply voltage provided by the charging power source for the control unit;

a main control chip, connected to the power source management chip and the voltage conversion unit and configured to send a control instruction according to the current value and control the voltage conversion unit to turn on and turn off; and

a switch control unit, connected to the main control chip and the charging adaptation unit respectively and configured to send a control instruction according to the current value and control the charging adaptation unit to turn on and turn off.

7. The charging circuit according to claim 1, wherein the universal interface is a Universal Serial Bus (USB) interface.

8. A control method of a charging circuit, the control method including:

using, by a charging adaptation unit, a first circuit as a charging circuitry for a mobile device by default;

determining, by the charging adaptation unit, whether a first current value corresponding to a charging voltage of the first circuit is larger or smaller than a first threshold thereby obtaining a first determination result; and

controlling, by the charging adaptation unit, the first circuit to charge the mobile device when the first determination result is that the first current value is larger than the first threshold.

9. The control method according to claim 8, wherein after the step of controlling the first circuit to charge the mobile device, the method further comprises:

determining whether a second current value corresponding to the charging voltage of the first circuit is larger or smaller than a second threshold thereby obtaining a second determination result;

controlling the first circuit to continue to charge the mobile device when the second determination result is that the second current value is larger than the second threshold, and controlling the first circuit to stop charging the mobile device when the determination result is that the second current value is smaller than the second threshold.

10. The control method according to claim 9, wherein voltages on two data pins of the first circuit are the same.

11. The control method according to claim 10, wherein when the first determination result is that the first current value is smaller than or equal to the first threshold, the method further includes:

determining a second circuit to be a charging circuitry according to the first current value; and

controlling the second circuit to charge the mobile device.

12. The control method according to claim 11, wherein voltages on two data pins of the second circuit are different.

13. The control method according to claim 8, wherein voltages on two data pins of the first circuit are the same.

14. The control method according to claim 13, wherein when the first determination result is that the first current value is smaller than or equal to the first threshold, the method further includes:

determining a second circuit to be a charging circuitry according to the first current value; and

controlling the second circuit to charge the mobile device.

15. The control method according to claim 14, wherein voltages on two data pins of the second circuit are different.