INDUCTION DEVICE COMPRISING MULTIPLE INDIVIDUAL COILS FOR INDUCTION HEATING PLATES

• US 20090020526A1
• Filed: 12/27/2006
• Published: 01/22/2009
• Est. Priority Date: 12/27/2005
• Status: Abandoned Application

• Current Assignee: Groupe Brandt
• Original Assignee: Fagorbrandt Sas (Cevital SPA)
• Inventors: Roux, Alain
• Application Number:
  US12/159,207
• Publication Number:
  US 20090020526A1
• Time in Patent Office: Days
• US Class Current: 219/672
• CPC Class Codes: H05B 6/1254 using conductive pieces to direct the induced magnetic field
• 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

An induction device for an induction heating plate (5), is adapted in such a way as to be arranged beneath a vitroceramic plate and includes at least first and second individual electroconductive windings (3A and 3B) which are arranged next to each other in a first plane. The device includes a magnetic conductive element (6) forming a coupling member which extends beneath the first individual winding (3A) and the second individual winding (3B) in such a way as to magnetically couple the first and second individual windings (3A and 3B). The invention can be especially used in an induction cooking surface.

Claims

1. Induction device for an induction heating plate designed to be positioned under a glass-ceramic plate (1), comprising at least first and second individual coils (3A and 3B) with electrically conductive windings, positioned side by side in a first plane, characterized in that it comprises a magnetic conductive element (6) forming coupling means extending below the first individual coil (3A) and below the second individual coil (3B) so as to magnetically couple said first and second individual coils (3A and 3B).

2. Device according to claim 1, characterized in that the magnetic conductive element (6) is a one-piece element.

3. Device according to claim 1, characterized in that the magnetic conductive element (6) is split into two parts (6A, 6B) separated by an airgap (E).

4. Device according to claim 3, characterized in that the airgap (E) is less than or equal to 5 mm.

5. Device according to claim 3, characterized in that the two parts (6A and 6B) of the magnetic conductive element extend beyond the first and second individual coils (3A and 3B) respectively.

6. Device according to claim 1, characterized in that the magnetic conductive element (6;

6′

) extends in a direction (D) coincident with an axis (X) passing through the centers of said first and second coils (3A, 3B;

3B, 3C).

7. Device according to claim 1, characterized in that the magnetic conductive element (6;

6′

) extends in a direction (D) shifted relative to the axis (X) passing through the centers of said first and second coils (3A, 3B;

3B, 3C).

8. Device according to claim 1, characterized in that the portion of surface (S1;

S1′

) of the magnetic conductive element (6;

6′

) covered by the first coil (3B) is less than the portion of surface (S2;

S2′

) of the magnetic conductive element (6;

6′

) covered by the second coil (3A;

3C).

9. Device according to claim 1, characterized in that the dimensions of the first coil (3B) are greater than the dimensions of the second coil (3A).

10. Device according to claim 1, characterized in that it comprises at least a third coil (3C) and at least a second magnetic conductive element (6′

) forming coupling means extending below the first coil (3B) and below the third coil (3C).

11. Device according to claim 1, characterized in that the electrically conductive windings of the individual coils (3A, 3B) are not parallel to each other.

12. Device according to claim 1, characterized in that the first and second individual coils (3A, 3B) are biased in opposite directions.

13. Device according to claim 1, characterized in that the first and second individual coils (3A, 3B) are connected in series.

14. Device according to claim 1, characterized in that the first and second individual coils (3A, 3B) each extend in a disk.

15. Device according to claim 1, characterized in that the material of the magnetic conductive element(s) (6, 6′

) forming coupling means is a ferrite.

16. Induction hob comprising at least one heating plate (5) and a glass-ceramic plate (1), characterized in that it comprises an induction device claim 1 associated with said heating plate.

17. Device according to claim 4, characterized in that the two parts (6A and 6B) of the magnetic conductive element extend beyond the first and second individual coils (3A and 3B) respectively.