Charging circuit and terminal for wired and wireless charging

• US 10,141,774 B2
• Filed: 03/04/2014
• Issued: 11/27/2018
• Est. Priority Date: 03/04/2014
• Status: Active Grant

• Current Assignee: Huawei Device Company Limited (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Device, Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Liu, Wenju, Peng, Zhonghui, Yang, Jiangtao
• Primary Examiner(s): Tso, Edward
• Application Number:
  US15/123,583
• Publication Number:
  US 20170077743A1
• Time in Patent Office: 1,729 Days
• Field of Search: 320132, 320137, 320149, 320161-164
• CPC Class Codes: H02J 2207/40 adapted for charging from various sources, e.g. AC, DC or multivoltage
• CPC Class Codes: H02J 50/00 Circuit arrangements or systems for wireless supply or distribution of electric power
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/0029 with safety or protection devices or circuits
• CPC Class Codes: H02J 7/0036 using connection detecting circuits H02J7/0034 takes precedence
• CPC Class Codes: H03K 17/122 in field-effect transistor switches

Abstract

The present invention disclose a charging circuit including: a first input/output end of a wired connection module is configured to connect to an output end, a second input/output end of the wired connection module connects to a first input end of a switch circuit, and the second input/output end connects to a first input/output end; a first input end of a control circuit connects to the second input/output end, and an output end connects to an enabling end of a wireless charging module; an output end connects to a second input end of the switch circuit; a first output end connects to an input/output end; a second input/output end of the shunt circuit connects to the input/output end, a third end of the shunt circuit connects to the output end; an output end of the charging management module is configured to connect to a battery.

Claims

1. A charging circuit, comprising:

a wired connection module, a wireless charging module, a switch circuit, a control circuit, a shunt circuit, and a charging management module, wherein;

a first input/output end of the wired connection module is configured to connect to an output end of a wired charger, a second input/output end of the wired connection module connects to a first input end of the switch circuit, and the second input/output end further connects to a first input/output end of the shunt circuit;

a first input end of the control circuit connects to the second input/output end of the wired connection module, and an output end of the control circuit connects to an enabling end of the wireless charging module;

an output end of the wireless charging module connects to a second input end of the switch circuit;

a first output end of the switch circuit connects to an input/output end of the charging management module;

a second input/output end of the shunt circuit connects to the input/output end of the charging management module, and a third end of the shunt circuit connects to the output end of the wireless charging module; and

an output end of the charging management module is configured to connect to a battery.

2. The circuit according to claim 1, wherein the wired connection module is configured to receive a first charging signal output by the wired charger, wherein the first charging signal charges the battery after passing through the second input/output end of the wired connection module, the first input end of the switch circuit, the first output end of the switch circuit, an input end of the charging management module, and the output end of the charging management module;

when the third end of the shunt circuit does not receive a second charging signal output by the output end of the wireless charging module, the first input/output end of the shunt circuit and the second input/output end of the shunt circuit are conducted, so that the first charging signal charges the battery after passing through the second input/output end of the wired connection module, the first input/output end of the shunt circuit, the second input/output end of the shunt circuit, the input end of the charging management module, and the output end of the charging management module; and

the first charging signal is further transmitted to the first input end of the control circuit by using the second input/output end of the wired connection module, and when the first input end of the control circuit receives the first charging signal, the output end of the control circuit outputs a high level signal, the high level signal is transmitted to the enabling end of the wireless charging module, the enabling end of the wireless charging module receives the high level signal, and the output end of the wireless charging module does not output a signal.

3. The circuit according to claim 1, wherein the third end of the shunt circuit connects to the output end of the wireless charging module by using a protection circuit.

4. The circuit according to claim 3, wherein the shunt circuit comprises:

at least one group of P-type MOS transistors, wherein;

each group of P-type MOS transistors comprises a first P-type MOS transistor and a second P-type MOS transistor, wherein a drain electrode of the first P-type MOS transistor connects to the second input/output end of the wired connection module, a source electrode of the first P-type MOS transistor connects to a source electrode of the second P-type MOS transistor, a drain electrode of the second P-type MOS transistor connects to the input/output end of the charging management module, a gate electrode of the first P-type MOS transistor connects to a gate electrode of the second P-type MOS transistor, and the gate electrode of the first P-type MOS transistor connects to the output end of the wireless charging module by using the protection circuit.

5. The circuit according to claim 1, wherein the control circuit comprises:

a resistor R3, a resistor R4, a resistor R5, and a first N-type MOS transistor, wherein;

one end of the resistor R3 connects to the second input/output end of the wired connection module, and the other end of the resistor R3 connects to a gate electrode of the first N-type MOS transistor and one end of the resistor R4;

the one end of the resistor R4 connects to the gate electrode of the first N-type MOS transistor, and the other end of the resistor R4 is grounded; and

a drain electrode of the first N-type MOS transistor is configured to connect to a stable potential, a source electrode of the first N-type MOS transistor connects to the enabling end of the wireless charging module, and the source electrode of the first N-type MOS transistor is further grounded by using the resistor R5.

6. The circuit according to claim 2, wherein the circuit further comprises a controller, and the enabling end of the wireless charging module further connects to a first input/output end of the controller;

the first input/output end of the wired connection module is further configured to connect to an external device;

the controller is configured to;

when the first input/output end of the wired connection module connects to the external device, output a high level signal to the enabling end of the wireless charging module, wherein the output end of the wireless charging module does not output a signal when the enabling end of the wireless charging module receives the high level signal; and

the controller is further configured to control the charging management module, wherein a current output by the charging management module supplies power to the external device after passing through the second input/output end of the shunt circuit, the first input/output end of the shunt circuit, the second input/output end of the wired connection module, and the first input/output end of the wired connection module.

7. The circuit according to claim 6, wherein the circuit further comprises a display signal transmission circuit and a display screen, wherein an input end of the display signal transmission circuit connects to a second output end of the switch circuit, an output end of the display signal transmission circuit connects to a second input/output end of the controller, and an input end of the display screen connects to a third input/output end of the controller, wherein:

the switch circuit is further configured to;

when the switch circuit receives the first charging signal, output a high level signal by using the second output end of the switch circuit, when the input end of the display signal transmission circuit receives the high level signal, the display signal transmission circuit outputs a low level signal to the controller, the controller is further configured to output a first display instruction to the display screen according to the low level signal transmitted by the display signal transmission circuit, and the display screen is configured to display a first display message according to the first display instruction, wherein the first display message is used to indicate that wired charging is currently performed on the battery; and

the switch circuit is further configured to;

when the switch circuit receives the second charging signal, output a low level signal by using the second output end of the switch circuit, when the input end of the display signal transmission circuit receives the low level signal, the display signal transmission circuit outputs a high level signal to the controller, the controller is further configured to output a second display instruction to the display screen according to the high level signal transmitted by the display signal transmission circuit, and the display screen is configured to display a second display message according to the second display instruction, wherein the second display message is used to indicate that wireless charging is currently performed on the battery.

8. The circuit according to claim 4, wherein:

the protection circuit comprises;

a resistor R1, a resistor R2, and a capacitor C1, wherein the resistor R1 is serially connected between the gate electrode of the first P-type MOS transistor and the output end of the wireless charging module, the capacitor C1 is serially connected between the gate electrode of the first P-type MOS transistor and ground, and the resistor R2 is serially connected between the output end of the wireless charging module and the ground.

9. The circuit according to claim 7, wherein the display signal transmission circuit comprises:

a resistor R6, a resistor R7, and a second N-type MOS transistor, wherein;

a gate electrode of the second N-type MOS transistor connects to the second output end of the switch circuit, the gate electrode of the second N-type MOS transistor is further grounded by using the resistor R7, a drain electrode of the second N-type MOS transistor connects to the second input/output end of the controller, the drain electrode of the second N-type MOS transistor further connects to a stable potential by using the resistor R6, and a source electrode of the second N-type MOS transistor is grounded.

10. The circuit according to claim 1, wherein the circuit further comprises:

a first electrostatic protection circuit comprising;

a capacitor C2, a capacitor C3, and an electrostatic protection diode D1, wherein;

one end of the capacitor C2 connects to the output end of the wireless charging module, and the other end of the capacitor C2 is grounded;

one end of the capacitor C3 connects to the output end of the wireless charging module, and the other end of the capacitor C3 is grounded; and

one end of the electrostatic protection diode D1 connects to the output end of the wireless charging module, and the other end of the electrostatic protection diode D1 is grounded.

11. The circuit according to claim 1, wherein the circuit further comprises:

a second electrostatic protection circuit comprising;

an electrostatic protection diode D2, wherein;

one end of the electrostatic protection diode D2 connects to the enabling end of the wireless charging module and the first input/output end of the controller, and the other end of the electrostatic protection diode D2 is grounded.

12. The circuit according to claim 2, wherein the wireless charging module is configured to receive a second charging signal output by a wireless charger, wherein the enabling end of the wireless charging module receives a low level signal, and the second charging signal charges the battery after passing through the output end of the wireless charging module, the second input end of the switch circuit, the first output end of the switch circuit, an input end of the charging management module, and the output end of the charging management module.

13. The circuit according to claim 6, wherein the switch circuit is further configured to:

when the switch circuit receives the first charging signal, output a low level signal by using the second output end of the switch circuit, when the input end of the display signal transmission circuit receives the low level signal, the display signal transmission circuit outputs a high level signal to the controller, the controller is further configured to output a first display instruction to the display screen according to the high level signal transmitted by the display signal transmission circuit, and the display screen is configured to display a first display message according to the first display instruction, wherein the first display message is used to indicate that wired charging is currently performed on the battery; and

the switch circuit is further configured to;

when the switch circuit receives the second charging signal, output a high level signal by using the second output end of the switch circuit, when the input end of the display signal transmission circuit receives the high level signal, the display signal transmission circuit outputs a low level signal to the controller, the controller is further configured to output a second display instruction to the display screen according to the low level signal transmitted by the display signal transmission circuit, and the display screen is configured to display a second display message according to the second display instruction, wherein the second display message is used to indicate that wireless charging is currently performed on the battery.

14. The terminal comprising:

a charging circuit comprising a wired connection module, a wireless charging module, a switch circuit, a control circuit, a shunt circuit, and a charging management module, wherein;

a first input/output end of the wired connection module is configured to connect to an output end of a wired charger, a second input/output end of the wired connection module connects to a first input end of the switch circuit, and the second input/output end further connects to a first input/output end of the shunt circuit;

a first input end of the control circuit connects to the second input/output end of the wired connection module, and an output end of the control circuit connects to an enabling end of the wireless charging module;

an output end of the wireless charging module connects to a second input end of the switch circuit;

a first output end of the switch circuit connects to an input/output end of the charging management module;

a second input/output end of the shunt circuit connects to the input/output end of the charging management module, and a third end of the shunt circuit connects to the output end of the wireless charging module; and

an output end of the charging management module is configured to connect to a battery.

15. The terminal according to claim 14, wherein the wired connection module is configured to receive a first charging signal output by the wired charger, wherein the first charging signal charges the battery after passing through the second input/output end of the wired connection module, the first input end of the switch circuit, the first output end of the switch circuit, an input end of the charging management module, and the output end of the charging management module;

when the third end of the shunt circuit does not receive a second charging signal output by the output end of the wireless charging module, the first input/output end of the shunt circuit and the second input/output end of the shunt circuit are conducted, so that the first charging signal charges the battery after passing through the second input/output end of the wired connection module, the first input/output end of the shunt circuit, the second input/output end of the shunt circuit, the input end of the charging management module, and the output end of the charging management module; and

the first charging signal is further transmitted to the first input end of the control circuit by using the second input/output end of the wired connection module, and when the first input end of the control circuit receives the first charging signal, the output end of the control circuit outputs a high level signal, the high level signal is transmitted to the enabling end of the wireless charging module, the enabling end of the wireless charging module receives the high level signal, and the output end of the wireless charging module does not output a signal.

16. The terminal according to claim 15, wherein the wireless charging module is configured to receive a second charging signal output by a wireless charger, wherein the enabling end of the wireless charging module receives a low level signal, and the second charging signal charges the battery after passing through the output end of the wireless charging module, the second input end of the switch circuit, the first output end of the switch circuit, an input end of the charging management module, and the output end of the charging management module.

17. The terminal according to claim 14, wherein the third end of the shunt circuit connects to the output end of the wireless charging module by using a protection circuit.

18. The terminal according to claim 14, wherein the control circuit comprises:

a resistor R3, a resistor R4, a resistor R5, and a first N-type MOS transistor, wherein;

one end of the resistor R3 connects to the second input/output end of the wired connection module, and the other end of the resistor R3 connects to a gate electrode of the first N-type MOS transistor and one end of the resistor R4;

the one end of the resistor R4 connects to the gate electrode of the first N-type MOS transistor, and the other end of the resistor R4 is grounded; and

a drain electrode of the first N-type MOS transistor is configured to connect to a stable potential, a source electrode of the first N-type MOS transistor connects to the enabling end of the wireless charging module, and the source electrode of the first N-type MOS transistor is further grounded by using the resistor R5.

19. The terminal according to claim 14, wherein the circuit further comprises:

a second electrostatic protection circuit, wherein the second electrostatic protection circuit comprises;

an electrostatic protection diode D2, wherein;

one end of the electrostatic protection diode D2 connects to the enabling end of the wireless charging module and the first input/output end of the controller, and the other end of the electrostatic protection diode D2 is grounded.