Charging device

• US 8,143,844 B2
• Filed: 01/14/2008
• Issued: 03/27/2012
• 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
• Primary Examiner(s): Fantu, Yalkew
• Application Number:
  US12/007,622
• Publication Number:
  US 20080174266A1
• Time in Patent Office: 1,534 Days
• Field of Search: 320/108
• US Class Current: 320/108
• 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:

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.

2. The charging device according to claim 1, 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.

3. The charging device according to claim 1, wherein a frequency of the second radio wave is lower than a frequency of the first radio wave.

4. 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.

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

6. The charging device according to claim 1, 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 electric power;

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 electric power 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.

8. The charging device according to claim 7, wherein the first electric power is a first radio wave and the second electric power is a second radio wave.

9. The charging device according to claim 7, 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.

10. The charging device according to claim 8, wherein a frequency of the second radio wave is lower than a frequency of the first radio wave.

11. 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.

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

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

14. A charging device comprising:

a first antenna circuit for receiving a first electric power;

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; and

a second antenna circuit for generating a second electric power when the second AC voltage is supplied to the second antenna circuit.

15. The charging device according to claim 14, wherein the first electric power is a first radio wave and the second electric power is a second radio wave.

16. The charging device according to claim 15, wherein a frequency of the second radio wave is lower than a frequency of the first radio wave.