Noncontact power-transmission coil, portable terminal, and terminal charging device

• US 20080164840A1
• Filed: 01/07/2008
• Published: 07/10/2008
• Est. Priority Date: 01/09/2007
• Status: Abandoned Application

• Current Assignee: Seiko Epson Corporation (Seiko Group), Sony Ericsson Mobile Communications (Sony Group Corp.)
• Original Assignee: Seiko Epson Corporation (Seiko Group), Sony Ericsson Mobile Communications Japan Incorporated (Sony Group Corp.)
• Inventors: Suzuki, Katsuya, Yamazaki, Manabu, Onishi, Kota, Jin, Mikimoto, Kato, Hiroshi, Kamijo, Takahiro, Kondo, Yoichiro, Suzuki, Kuniharu, Yoda, Kentaro, Sogabe, Haruhiko
• Application Number:
  US12/007,078
• Publication Number:
  US 20080164840A1
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H01F 2027/2819 Planar transformers with printed windings, e.g. surrounded by two cores and to be mounted on printed circuit
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 27/2828 Construction of conductive connections, of leads
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/361 made of combinations of electrically conductive material and ferromagnetic material
• 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 50/10 using inductive coupling
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 7/00045 Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source

Abstract

A noncontact power-transmission coil is provided. The noncontact power-transmission coil includes a planar coil and a printed-circuit board. The planar coil is formed by spirally winding a linear conductor made of a single or twisted wire in a substantially same plane. The printed-circuit board includes a first external connection terminal portion, a second external connection terminal portion, a first contact portion connected to an inner peripheral end of the spirally-wound linear conductor, a second contact portion connected to the outer peripheral end of the spirally-wound linear conductor, a first conductor pattern connecting the first contact portion to a first external connection terminal portion, and a second conductor pattern connecting the second contact portion to a second external connection terminal portion. One planar portion of the planar coil is attached on the surface of the flexible printed-circuit board.

Claims

1. A noncontact power-transmission coil, comprising:

a planar coil formed by spirally winding a linear conductor made of a single or twisted wire in a substantially same plane; and

a printed-circuit board including a first external connection terminal portion, a second external connection terminal portion, a first contact portion connected to an inner peripheral end of the spirally-wound linear conductor, a second contact portion connected to the outer peripheral end of the spirally-wound linear conductor, a first conductor pattern connecting the first contact portion to a first external connection terminal portion, and a second conductor pattern connecting the second contact portion to a second external connection terminal portion;

wherein

one planar portion of the planar coil is attached on the surface of the flexible printed-circuit board.

2. A noncontact power-transmission coil according to claim 1, wherein

a magnetic layer is formed to cover at least the other planar portion of the planar coil.

3. A noncontact power-transmission coil according to claim 1, wherein

the printed-circuit board includes a temperature-detecting element layer on which a temperature-detecting element is formed, and a conductor pattern and an external connection terminal portion for taking out a temperature-detecting signal detected by the temperature-detecting element to the outside.

4. A portable terminal comprising:

a rechargeable battery;

a noncontact power-transmission coil including a planar coil formed by spirally winding a linear conductor made of a single or twisted wire in a substantially same plane and a printed-circuit board having a first external connection terminal portion, a second external connection terminal portion, a first contact portion connected to the inner peripheral end of the spirally-wound linear conductor, a second contact portion connected to the outer peripheral end of the spirally-wound linear conductor, a first conductor pattern connecting the first contact portion to a first external connection terminal portion, and a second conductor pattern connecting the second contact portion to a second external connection terminal portion, one planar portion of the planar coil being attached on the surface of the flexible printed-circuit board; and

a charging control circuit executing control to charge the rechargeable battery with power received through the noncontact power-transmission coil.

5. A portable terminal according to claim 4, wherein

a magnetic layer is formed on the noncontact power-transmission coil to cover at least the other planar portion of the planar coil.

6. A portable terminal according to claim 4, wherein

the printed-circuit board of the noncontact power-transmission coil includes:

a temperature-detecting element layer on which a temperature-detecting element is formed, and a conductor pattern and an external connection terminal portion for taking out a temperature-detecting signal detected by the temperature-detecting element to the outside.

7. A terminal charging device, comprising:

a terminal-mounting base on which a predetermined portable terminal including a rechargeable battery is mounted;

a noncontact power-transmission coil that includes a planar coil formed by spirally winding a linear conductor made of a single or twisted wire in a substantially same plane and a printed-circuit board having a first external connection terminal portion, a second external connection terminal portion, a first contact portion connected to the inner peripheral end of the spirally-wound linear conductor, a second contact portion connected to the outer peripheral end of the spirally-wound linear conductor, a first conductor pattern connecting the first contact portion to a first external connection terminal portion, and a second conductor pattern connecting the second contact portion to a second external connection terminal portion, one planar portion of the planar coil being attached on the surface of the flexible printed-circuit board, using electromagnetic induction with a coil installed in the predetermined portable terminal to charge the rechargeable battery of the portable terminal in a noncontact manner; and

a power-supply control unit for controlling power supply to the noncontact power-transmission coil.

8. A terminal charging device according to claim 7, wherein

a magnetic layer is formed on the noncontact power-transmission coil to cover at least the other planar portion of the planar coil.

9. A terminal charging device according to claim 7,

wherein the printed-circuit board of the noncontact power-transmission coil includes a temperature-detecting element layer on which a temperature-detecting element is formed and a conductor pattern and an external connection terminal portion for taking out a temperature-detecting signal detected by the temperature-detecting element to the outside, and

wherein the power-supply control unit controls power supply to the noncontact power-transmission coil on the basis of at least a temperature-detecting signal detected by the temperature-detecting element.