Wireless charging system with double detecting circuits

• US 9,425,643 B2
• Filed: 10/29/2014
• Issued: 08/23/2016
• Est. Priority Date: 10/29/2013
• Status: Active Grant

• Current Assignee: GZ Electronic Company Limited
• Original Assignee: Knowmax Technology Ltd.
• Inventors: Huang, Kuo-Chan, Li, Che-Ying
• Primary Examiner(s): PELTON, NATHANIEL R
• Application Number:
  US14/527,509
• Publication Number:
  US 20150115882A1
• Time in Patent Office: 664 Days
• Field of Search: 320/108, 455/41.1
• US Class Current: 1/1
• CPC Class Codes: H02J 50/10 using inductive coupling
• 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 wireless charging system with double detecting circuits comprises a detecting circuit connected to an inductive loop to detect the induced electric field of the inductive loop; an auxiliary detection circuit connected to a power loop to detect the induced electric field of the power loop, wherein when the waveform detected by the detecting circuit is not applicable, it is replaced by the waveform detected by the auxiliary detecting circuit in order to determine the condition of the electrical receiver device and thus adjust the output to the inductive loop from the power loop.

Claims

1. A wireless charging system with double detecting circuits, comprising:

an inductive loop including an induction coil and a capacitor, wherein said induction coil and said capacitor are connected in series;

a power loop including a power source and a driving circuit, wherein said power source is connected to an input terminal of said driving circuit, two output terminals of said driving circuit are connected to said capacitor and said induction coil respectively; and

a control loop including;

a processor;

a detection circuit, coupled to said processor and a detection point of said inductive loop so that said processor can detect an induced electric field of said inductive loop, wherein a first current or a first voltage of said inductive loop is created by said induced electric field as an induced waveform over time;

an auxiliary detection circuit, connected to an auxiliary detection point of said power loop to detect said induced electric field, wherein a current or a voltage of said power loop induced by said induced electric field represents an auxiliary induced waveform over time, as said induced waveform is not applicable determined by said processor based on a protocol, said induced waveform is replaced by said auxiliary induced waveform;

a control line, coupled to said processor and said power source so that said processor can control a power supply of said power source outputted to said inductive loop; and

an auxiliary control line, coupled to said processor and said power source so that said processor can control a phase or a frequency of said driving circuit to control said power supply for said inductive loop;

wherein said processor determines a condition of said electrical receiver device based on said induced electric field, to adjust said power supply of said power loop outputted to said inductive loop.

2. The system of claim 1, wherein said processor performs the following process:

reading simultaneously said induced waveform detected by said detection circuit and said auxiliary induced waveform detected by said auxiliary detection circuit;

determining whether said induced waveform is correct or not by said protocol;

as said induced waveform is correct, selecting said induced waveform detected by said detection circuit;

as said induced waveform is not correct, determining whether said auxiliary induced waveform is correct or not; and

as said auxiliary induced waveform is correct, selecting said auxiliary induced waveform detected by said auxiliary detection circuit.

3. The system of claim 1, wherein said processor performs the following process:

reading simultaneously said induced waveform detected by said detection circuit and said auxiliary induced waveform detected by said auxiliary detection circuit;

determining whether a first channel of said detection circuit is applied to connect;

as said first channel of said detection circuit is applied to connect, determining whether said induced waveform is correct or not, if correct, then said induced waveform detected by the detection circuit is applied, if not correct, then a second channel of said auxiliary detection circuit is applied to connect; and

as a second channel of said auxiliary detection circuit is applied to connect, determining whether said auxiliary induced waveform is correct or not, if correct, then said auxiliary induced waveform is applied, if not correct, then said first channel of said detection circuit is applied to connect.

4. The system of claim 1, wherein said processor performs the following process:

determining whether a first channel of said detection circuit is applied to connect;

as said first channel of said detection circuit is applied to connect, reading said induced waveform detected by said detection circuit and determining whether said induced waveform is correct or not, if correct, then said induced waveform detected by the detection circuit is applied, if not correct, then a second channel of said auxiliary detection circuit is applied to connect; and

as a second channel of said auxiliary detection circuit is applied to connect, determining whether said auxiliary induced waveform is correct or not, if correct, then said auxiliary induced waveform is applied, if not correct, then said first channel of said detection circuit is applied to connect.

5. The system of claim 1, wherein said condition includes a variation of said induced electric field due to approaching of said electric receiver device.

6. The system of claim 1, wherein said condition includes a variation of said induced electric field due to a power dissipation of said electric receiver device.

7. The system of claim 1, wherein said detection point is located between said driving circuit and said capacitor.

8. The system of claim 1, wherein said detection point is located between said driving circuit and said induction coil.

9. The system of claim 1, wherein said detection point is located between said capacitor and said induction coil.

10. The system of claim 1, wherein said auxiliary detection point locates on a non-ground circuit between said power source and said driving circuit.

11. The system of claim 1, wherein said auxiliary detection point locates on a ground circuit between said power source and said driving circuit.

12. The system of claim 1, wherein said driving circuit is a full-bridge driving circuit.

13. The system of claim 1, wherein said driving circuit is a half-bridge driving circuit.

14. The system of claim 1, wherein said detection circuit includes a filter, wherein an input terminal of said filter is connected to said inductive loop, and an output terminal of said filter is connected to said processor.

15. The system of claim 14, wherein said auxiliary detection circuit includes an auxiliary filter, wherein an input terminal of said auxiliary filter is connected to said power loop, and an output terminal of said auxiliary filter is connected to said processor.

16. The system of claim 15, further comprising two detection lines, and each of said two detection lines is connected to an identical detection point, and wherein said filter or said auxiliary filter has a different modulation ratio to provide said induced waveform with different modulation ratio to said processor.

17. The system of claim 15, further comprising two auxiliary detection lines, and each of said two auxiliary detection lines is connected to an identical auxiliary detection point, and wherein said filter or said auxiliary filter has a different modulation ratio to provide said auxiliary induced waveform with different modulation ratio to said processor.

18. The system of claim 1, wherein said detection circuit includes a current-type detector in said inductive loop, wherein said detection circuit, said induction coil and said capacitor are connected in series.

19. The system of claim 18, wherein said auxiliary detection circuit includes an auxiliary current-type detector in said inductive loop to connect to said driving circuit and said power loop.

20. The system of claim 19, wherein driving circuit is a full-bridge driving circuit or a half-bridge driving circuit.