Charging device

• US 20080174266A1
• Filed: 01/14/2008
• Published: 07/24/2008
• Est. Priority Date: 01/19/2007
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Tamura, Hikaru
• Granted Patent: US 8,143,844 B2
• Time in Patent Office: Days
• US Class Current: 320/107
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction
• CPC Class Codes: H05B 6/76 Prevention of microwave leakage, e.g. door sealings

Abstract

The charging circuit includes an antenna circuit receiving radio waves, a rectifier circuit rectifying AC voltage generated in the antenna circuit to generate DC voltage, and a power supply circuit adjusting the magnitude of the DC voltage and charging a rechargeable battery using the adjusted DC voltage. The charging device may further include a charge control circuit controlling the power supply circuit so as to prevent overcharge of the rechargeable battery. The rechargeable battery may be charged by application of DC voltage to a pair of terminals, or it may be charged wirelessly in such a manner that an oscillation circuit and an output antenna circuit are additionally provided.

Claims

1. A charging device comprising:

an antenna circuit for receiving a radio wave;

a charging circuit for rectifying AC voltage generated in the antenna circuit to generate DC voltage and adjusting a magnitude of the DC voltage;

a terminal configured to be supplied with the adjusted DC voltage;

a first protective material covering the charging circuit and the terminal; and

a second protective material covering the antenna circuit,

wherein the terminal is adapted to be electrically connected to a rechargeable battery.

2. The charging device according to claim 1, wherein the second protective material is further covering the charging circuit and the terminal.

13. The charging device according to claim 1, wherein the first protective material is a material in which a carbon material, a ferrite material, or a carbonyl iron material is mixed into a synthetic rubber or urethane.

18. The charging device according to claim 1, wherein the second protective material is either one of a synthetic resin or ceramic.

23. The charging device according to claim 1, wherein the first protective material is thicker than the second protective material.

3. A charging device comprising:

an antenna circuit for receiving a radio wave;

a charging circuit for rectifying AC voltage generated in the antenna circuit to generate DC voltage and adjusting a magnitude of the DC voltage;

a storage portion for storing a rechargeable battery to be charged by the charging circuit;

a first protective material covering the charging circuit and the storage portion; and

a second protective material covering the antenna circuit.

4. The charging device according to claim 3, wherein the second protective material is further covering the charging circuit and the storage portion.

14. The charging device according to claim 3, wherein the first protective material is a material in which a carbon material, a ferrite material, or a carbonyl iron material is mixed into a synthetic rubber or urethane.

19. The charging device according to claim 3, wherein the second protective material is either one of a synthetic resin or ceramic.

24. The charging device according to claim 3, wherein the first protective material is thicker than the second protective material.

5. A charging device comprising:

an antenna circuit for receiving a radio wave;

a rectifier circuit for rectifying AC voltage generated in the antenna circuit to generate DC voltage;

a power supply circuit for adjusting a magnitude of the DC voltage;

a terminal configured to be supplied with the adjusted DC voltage;

a charge control circuit for controlling the power supply circuit;

a first protective material covering the rectifier circuit, the power supply circuit, the terminal, and the charge control circuit; and

a second protective material covering the antenna circuit,

wherein the terminal is adapted to be electrically connected to a rechargeable battery.

6. The charging device according to claim 5, wherein the second protective material is further covering the rectifier circuit, the power supply circuit, the terminal, and the charge control circuit.

15. The charging device according to claim 5, wherein the first protective material is a material in which a carbon material, a ferrite material, or a carbonyl iron material is mixed into a synthetic rubber or urethane.

20. The charging device according to claim 5, wherein the second protective material is either one of a synthetic resin or ceramic.

25. The charging device according to claim 5, wherein the first protective material is thicker than the second protective material.

7. A charging device comprising:

a first antenna circuit for receiving a first radio wave;

a charging circuit for generating second AC voltage using first AC voltage generated in the first antenna circuit;

a second antenna circuit for generating a second radio wave when the second AC voltage is supplied to the second antenna circuit;

a first protective material covering the charging circuit and the second antenna circuit; and

a second protective material covering the first antenna circuit.

8. The charging device according to claim 7, wherein the second protective material is further covering the charging circuit, and the second antenna circuit.

11. The charging device according to claim 7, wherein a frequency of the second radio wave is lower than a frequency of the first radio wave.

16. The charging device according to claim 7, wherein the first protective material is a material in which a carbon material, a ferrite material, or a carbonyl iron material is mixed into a synthetic rubber or urethane.

21. The charging device according to claim 7, wherein the second protective material is either one of a synthetic resin or ceramic.

26. The charging device according to claim 7 wherein the first protective material is thicker than the second protective material.

9. A charging device comprising:

a first antenna circuit for receiving a first radio wave;

a rectifier circuit for rectifying first AC voltage generated in the first antenna circuit to generate DC voltage;

a power supply circuit for adjusting a magnitude of the DC voltage;

an oscillation circuit for generating second AC voltage when the adjusted DC voltage is inputted to the oscillation circuit;

an oscillation control circuit for controlling the oscillation circuit;

a second antenna circuit for generating a second radio wave when the second AC voltage is supplied to the second antenna circuit;

a first protective material covering the rectifier circuit, the power supply circuit, the oscillation circuit, the oscillation control circuit, and the second antenna circuit; and

a second protective material covering the first antenna circuit.

10. The charging device according to claim 9, wherein the second protective material is further covering the rectifier circuit, the power supply circuit, the oscillation circuit, the oscillation control circuit, and the second antenna circuit.

12. The charging device according to claim 9, wherein a frequency of the second radio wave is lower than a frequency of the first radio wave.

17. The charging device according to claim 9, wherein the first protective material is a material in which a carbon material, a ferrite material, or a carbonyl iron material is mixed into a synthetic rubber or urethane.

22. The charging device according to claim 9, wherein the second protective material is either one of a synthetic resin or ceramic.

27. The charging device according to claim 9, wherein the first protective material is thicker than the second protective material.