NON-CONTACT TYPE POWER RECEIVING APPARATUS, ELECTRONIC EQUIPMENT AND CHARGING SYSTEM USING THE POWER RECEIVING APPARATUS

• US 20110210696A1
• Filed: 08/20/2008
• Published: 09/01/2011
• Est. Priority Date: 08/21/2007
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation), Toshiba Materials Company Limited (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation), Toshiba Materials Company Limited (Toshiba Corporation)
• Inventors: Inoue, Tetsuo
• Granted Patent: US 8,922,160 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H01F 2038/143 for signals
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/366 made of ferromagnetic material
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• 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

Abstract

A non-contact type power receiving apparatus including: a power receiving coil having a spiral coil; a rectifier; a secondary battery; an electronic device operated by being supplied with direct voltage from the secondary battery, wherein a composite magnetic body is provided to at least one portion between the secondary battery and the spiral coil, and a portion between the electronic device and the spiral coil. The composite magnetic body includes at least first and other layers of magnetic sheets through an insulating layer in which when a relative magnetic permeability of the first magnetic sheet provided to a side of the spiral coil is μd, a thickness of the first magnetic sheet is tu, an average relative magnetic permeability of the other magnetic sheets other than the first magnetic sheet is μu, and a total thickness of the other magnetic sheets is tu, the composite magnetic body satisfies the following relations: μd·td≦60 [mm]; and μu·tu≧100 [mm].

Claims

1. A non-contact type power receiving apparatus comprising:

a power receiving coil having a spiral coil;

a rectifier for rectifying alternative voltage generated at the power receiving coil;

a secondary battery for being charged with direct voltage which is rectified by the rectifier; and

an electronic device operated by being supplied with the direct voltage from the secondary battery,

wherein said non-contact type power receiving apparatus further comprises a composite magnetic body which is provided to at least one portion between the secondary battery and the spiral coil, and a portion between the electronic device and the spiral coil, wherein said composite magnetic body comprises at least two layers including first and other layers of magnetic sheets through an insulating layer in which when a relative magnetic permeability of the first magnetic sheet provided to a side of the spiral coil is denoted as μ

d, a thickness of the first magnetic sheet is denoted as tu, an average relative magnetic permeability of the other layers of magnetic sheets other than the first magnetic sheet is denoted as μ

u, and a total thickness of the other layers of magnetic sheets is denoted as tu, said composite magnetic body satisfy the following relations;

μ

d·

td≦

60 [mm]; and

μ

u·

tu≧

100 [mm].

2. The non-contact type power receiving apparatus according to claim 1, wherein said composite magnetic body satisfy the following relation:

(μ

u·

tu)/(μ

d·

td)≧

10.

3. The non-contact type power receiving apparatus according to claim 1, wherein said first magnetic sheet has a surface area larger than that of the other layers of the magnetic sheets constituting the composite magnetic body.

4. The non-contact type power receiving apparatus according to claim 1, wherein said insulating layer of the composite magnetic body is composed of resin containing magnetic powder.

5. The non-contact type power receiving apparatus according to claim 1, wherein a distance between the first magnetic sheet and the other magnetic sheets is 30 μ

m or more.

6. The non-contact type power receiving apparatus according to claim 1, wherein a total thickness of the composite magnetic body is 0.3 mm or less.

7. The non-contact type power receiving apparatus according to claim 1, wherein said secondary battery is a Li-ion secondary battery.

8. An electronic equipment comprising the non-contact type power receiving apparatus according to claim 1.

9. A charging system comprising:

the electronic equipment according to claim 8; and

the non-contact type power receiving apparatus provided to the electronic equipment so as to allow the non-contact type power receiving apparatus to charge electricity to the electronic equipment.

10. The non-contact type power receiving apparatus according to claim 2, wherein said first magnetic sheet has a surface area larger than that of the other layers of the magnetic sheets constituting the composite magnetic body.

11. The non-contact type power receiving apparatus according to claim 2, wherein said insulating layer of the composite magnetic body is composed of resin containing magnetic powder.

12. The non-contact type power receiving apparatus according to claim 2, wherein a distance between the first magnetic sheet and the other magnetic sheets is 30 μ

m or more.

13. The non-contact type power receiving apparatus according to claim 2, wherein a total thickness of the composite magnetic body is 0.3 mm or less.

14. The non-contact type power receiving apparatus according to claim 2, wherein said secondary battery is a Li-ion secondary battery.

15. An electronic equipment comprising the non-contact type power receiving apparatus according to claim 2.