ELECTROMAGNETIC INDUCTION COIL UNIT AND ELECTROMAGNETIC INDUCTION DEVICE

• US 20120154101A1
• Filed: 09/08/2010
• Published: 06/21/2012
• Est. Priority Date: 09/11/2009
• Status: Abandoned Application

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Miyashita, Norihiro, Fujita, Atsushi
• Application Number:
  US13/393,135
• Publication Number:
  US 20120154101A1
• Time in Patent Office: Days
• US Class Current: 336/225
• CPC Class Codes: H01F 27/2871 Pancake coils
• 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: H05B 6/1254 using conductive pieces to direct the induced magnetic field
• CPC Class Codes: H05B 6/365 using supplementary conductive or ferromagnetic pieces
• CPC Class Codes: Y02B 40/00 Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Abstract

In order to provide an electromagnetic induction coil unit and an electromagnetic induction device with reduced coil loss and high power transmission efficiency, and hence whose manufacturing costs are reduced, what is included is a coil (101) formed with a spiral conductor, and a magnetic partition wall (102) formed with a spiral magnetic element and disposed so as to sandwich at least a part of the spiral conductor of the coil (101).

Claims

1. An electromagnetic induction coil unit, comprising:

a coil which is formed with a spiral conductor; and

a magnetic partition wall which is formed with a spiral magnetic element and which is disposed so as to sandwich at least a part of the spiral conductor of the coil.

2. The electromagnetic induction coil unit according to claim 1, wherein

the magnetic partition wall is disposed so as to sandwich the conductor by a predetermined length from a central-axis-side end of the coil.

3. The electromagnetic induction coil unit according to claim 1, further comprising

a dielectric element for holding the coil.

4. The electromagnetic induction coil unit according to claim 1, further comprising

an outer circumferential magnetic partition wall which is disposed so as to cover an outer circumference of the coil.

5. The electromagnetic induction coil unit according to claim 1, wherein

the magnetic partition wall is structured with a magnetic element whose relative permeability is 5 or more and 1000 or less.

6. The electromagnetic induction coil unit according to claim 2, wherein

the magnetic partition wall is disposed so as to sandwich the conductor falling within a range spanning 25% to 75% of a total number of turns of the coil from the center-axis-side end of the coil.

7. The electromagnetic induction coil unit according to claim 1, wherein

a dimension of the magnetic partition wall in a direction of the central axis of the coil is greater than a dimension of the coil in the direction of the central axis, and

a surface of the coil opposing in the direction of the central axis is disposed on an inner side by 1.5 mm or more from a surface of the magnetic partition wall opposing in the direction of the central axis.

8. The electromagnetic induction coil unit according to claim 1, wherein

the magnetic partition wall has a multi-turn structure having a gap penetrating in a direction of the central axis of the coil.

9. The electromagnetic induction coil unit according to claim 1, wherein

the coil has a multilayer structure layered in a direction of the central axis of the coil.

10. The electromagnetic induction coil unit according to claim 1, wherein

a dielectric element is added to the coil to have a shunt capacitance.

11. The electromagnetic induction coil unit according to claim 1, wherein

a shunt capacitance is connected to both ends of the coil.

12. The electromagnetic induction coil unit according to claim 1 for use in an electromagnetic induction device which comprises:

an inverter circuit which supplies high frequency power to the coil of the electromagnetic induction coil unit; and

a matching circuit which matches the coil and the inverter circuit.

13. The electromagnetic induction coil unit according to claim 2 for use in an electromagnetic induction device which comprises:

an inverter circuit which supplies high frequency power to the coil of the electromagnetic induction coil unit; and

a matching circuit which matches the coil and the inverter circuit.

14. The electromagnetic induction coil unit according to claim 3 for use in an electromagnetic induction device which comprises:

an inverter circuit which supplies high frequency power to the coil of the electromagnetic induction coil unit; and

a matching circuit which matches the coil and the inverter circuit.

15. The electromagnetic induction coil unit according to claim 4 for use in an electromagnetic induction device which comprises:

an inverter circuit which supplies high frequency power to the coil of the electromagnetic induction coil unit; and

a matching circuit which matches the coil and the inverter circuit.

16. The electromagnetic induction coil unit according to claim 5 for use in an electromagnetic induction device which comprises:

an inverter circuit which supplies high frequency power to the coil of the electromagnetic induction coil unit; and

a matching circuit which matches the coil and the inverter circuit.

17. The electromagnetic induction coil unit according to claim 6 for use in an electromagnetic induction device which comprises:

an inverter circuit which supplies high frequency power to the coil of the electromagnetic induction coil unit; and

a matching circuit which matches the coil and the inverter circuit.

18. The electromagnetic induction coil unit according to claim 7 for use in an electromagnetic induction device which comprises:

an inverter circuit which supplies high frequency power to the coil of the electromagnetic induction coil unit; and

a matching circuit which matches the coil and the inverter circuit.

19. The electromagnetic induction coil unit according to claim 8 for use in an electromagnetic induction device which comprises:

an inverter circuit which supplies high frequency power to the coil of the electromagnetic induction coil unit; and

a matching circuit which matches the coil and the inverter circuit.

20. The electromagnetic induction coil unit according to claim 9 for use in an electromagnetic induction device which comprises:

an inverter circuit which supplies high frequency power to the coil of the electromagnetic induction coil unit; and

a matching circuit which matches the coil and the inverter circuit.

21. The electromagnetic induction coil unit according to claim 10 for use in an electromagnetic induction device which comprises:

an inverter circuit which supplies high frequency power to the coil of the electromagnetic induction coil unit; and

a matching circuit which matches the coil and the inverter circuit.

22. The electromagnetic induction coil unit according to claim 11 for use in an electromagnetic induction device which comprises:

an inverter circuit which supplies high frequency power to the coil of the electromagnetic induction coil unit; and

a matching circuit which matches the coil and the inverter circuit.