WIRELESS CHARGING SYSTEM AND TRANSMITTING END CIRCUIT THEREOF

• US 20120139359A1
• Filed: 12/06/2011
• Published: 06/07/2012
• Est. Priority Date: 12/06/2010
• Status: Abandoned Application

• Current Assignee: ASUSTek Computer, Inc.
• Original Assignee: ASUSTek Computer, Inc.
• Inventors: LAI, Ming-Iu, WANG, Chun-Hsiung
• Application Number:
  US13/312,731
• Publication Number:
  US 20120139359A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Abstract

A transmitting end circuit includes a rectifying unit, a control unit, a resonant unit, a primary coil and an inductor unit. The control unit outputs a control signal to the rectifying unit. The resonant unit has a first end connected to the rectifying unit. The primary coil is connected to the resonant unit. The inductor unit is connected to a second end of the primary coil and the controlling unit.

Claims

1. A transmitting end circuit, comprising:

a rectifying unit;

a control unit outputting a control signal to the rectifying unit;

a resonant unit including a first end connected to the rectifying unit;

a primary coil connected to the resonant unit; and

an inductor unit connected to a second end of the primary coil and the control unit.

2. The transmitting end circuit according to claim 1, wherein when a receiving end circuit approaches the transmitting end circuit in a preset distance, a phase difference is between the first end and the second end.

3. The transmitting end circuit according to claim 1, wherein when a receiving end circuit does not approach the transmitting end circuit in a preset distance, the first end and the second end have the same phase.

4. The transmitting end circuit according to claim 1, wherein the inductor unit includes an inductor.

5. The transmitting end circuit according to claim 4, wherein the inductor unit further includes:

a filter unit connected to the second end of the primary coil and the inductor unit.

6. The transmitting end circuit according to claim 5, wherein the filter unit includes

a resistor connected in series with a capacitor.

7. The transmitting end circuit according to claim 4, wherein the inductor unit further includes:

a measuring unit connected to the second end of the primary coil and the control unit, measuring a first voltage value of the second end at a first time point, and measuring a second voltage value of the second end at the second time point.

8. The transmitting end circuit according to claim 7, wherein when a receiving end circuit approaches the transmitting end circuit in the preset distance, the first voltage and the second voltage have opposite voltage phases.

9. The transmitting end circuit according to claim 7, wherein when a receiving end circuit does not approach the transmitting end circuit in a preset distance, the first voltage and the second voltage have the same voltage phase.

10. The transmitting end circuit according to claim 7, wherein the control unit has a preset value, when the first voltage or the second voltage is larger than the preset value, the control unit stops outputting the control signal.

11. A wireless charging system, comprising:

a transmitting end circuit, including;

a rectifying unit;

a control unit outputting a control signal to the rectifying unit;

a resonant unit including a first end connected to the rectifying unit;

a primary coil connected to the resonant unit; and

an inductor unit connected to a second end of the primary coil and the control unit; and

a receiving end circuit including a secondary coil.

12. The wireless charging system according to claim 11, wherein when the receiving end circuit approaches the transmitting end circuit in a preset distance, the primary coil interacts with the secondary coil, and a phase difference is between the first end and the second end.

13. The wireless charging system according to claim 11, wherein when the receiving end circuit does not approach the transmitting end circuit in a preset distance, the first end and the second end have the same phase.

14. The wireless charging system according to claim 11, wherein the inductor unit includes an inductor.

15. The wireless charging system according to claim 14, wherein the inductor unit further includes:

a filter unit connected to the second end of the primary coil and connected in parallel to the inductor unit.

16. The wireless charging system according to claim 15, wherein the filter unit includes a resistor connected in series with a capacitor.

17. The wireless charging system according to claim 14, wherein the inductor unit further includes:

a measuring unit connected to the second end of the primary coil and the control unit, measuring a first voltage of the second end at a first time point, and measuring a second voltage of the second end at a second time point.

18. The wireless charging system according to claim 17, wherein when the receiving end circuit approaches the transmitting end circuit in a preset distance, the first voltage and the second voltage have opposite voltage phases.

19. The wireless charging system according to claim 17, wherein when the receiving end circuit does not approach the transmitting end circuit in a preset distance, the first voltage and the second voltage have the same voltage phase.

20. The wireless charging system according to claim 17, wherein the control unit has a preset value, when the first voltage or the second voltage is larger than the present value, the control unit stops outputting the control signal.