Modular induction heated cooking hob having reduced radiation and a method of making the same

• US 6,498,325 B1
• Filed: 04/07/2000
• Issued: 12/24/2002
• Est. Priority Date: 04/09/1999
• Status: Expired due to Term

• Current Assignee: Jaeger Regulation
• Original Assignee: Jaeger Regulation
• Inventors: Akel, Dominique, Schlumberger, Henri
• Primary Examiner(s): Leung, Philip H.
• Application Number:
  US09/545,693
• Time in Patent Office: 991 Days
• Field of Search: 219/622, 219/624, 219/623, 219/626, 219/627, 219/665, 219/667, 219/672, 219/673, 219/675, 219/676, 99D/IG.14, 994/51, 336/225, 336/232, 336/223, 336/224
• US Class Current: 219/624
• CPC Class Codes: H05B 2213/03 Heating plates made out of a matrix of heating elements that can define heating areas adapted to cookware randomly placed on the heating plate
• CPC Class Codes: H05B 6/065 using coordinated control of multiple induction coils
• CPC Class Codes: H05B 6/1218 with arrangements using lights for heating zone state indication
• CPC Class Codes: H05B 6/1263 using coil cooling arrangements
• CPC Class Codes: H05B 6/1272 with more than one coil or coil segment per heating zone
• 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

A modular induction heated cooking hob inductor and hob are disclosed. The inductor is a wound conductor having turns at substantially right angles to previous turns. Parallel turns of the conductor are separated by a layer of insulation adjacent to the turns of the conductor. The hob may comprise multiple inductors. The inductor may have sensors for detecting a device to be heated and/or illuminatable segments that light up in response to the presence of an object to be heated.

Claims

1. An inductor for a cooking hob comprising:

a wound conductor with a rectangular cross section having a plurality of turns, each turn being a substantially a right angle to a previous turn and at substantially a right angle to a next turn; and

a layer if insulation having a plurality of turns, each turn being at substantially a right angle to a previous turn and at substantially a right angle to a next turn, the layer of insulation being adjacent to the conductor and located between adjacent turns of the conductor, and being thinner than the thickness of the conductor.

2. The inductor for a cooking hob of claim 1, wherein the inductor further comprises

a second wound conductor with a rectangular cross section having a plurality of turns, each turn being at substantially a right angle to a previous turn and at substantially a right angle to a next turn; and

a second layer of insulation having a plurality of turns, each turn being at substantially a right angle to a previous turn and at a substantially a right angle to a next turn, the layer of insulation being adjacent to the conductor and located between adjacent turns of the conductor, and being thinner than the thickness of the conductor;

wherein the second conductor and second layer of insulation are wound in parallel with the conductor and the layer of insulation.

3. A cooking hob comprising:

an inductor, the inductor comprising

a wound conductor with a rectangular cross section having a plurality of turns, each turn being at substantially a right angle to a previous turn and at substantially a right angle to a next turn; and

a layer of insulation having a plurality of turns, each turn being at substantially a right angle to a previous turn and at substantially a right angle to a next turn, the layer of insulation being adjacent to the conductor, and located between adjacent turns of the conductor, and being thinner than the thickness of the conductor;

a generator connected to the inductor for supplying power thereto.

4. The cooking hob of claim 3, further comprising:

at least one additional inductor spaced apart from the inductor, the additional inductor comprising;

a wound conductor with a rectangular cross section having a plurality of turns, each turn being at substantially a right angle to a previous turn and a substantially a right angle to a next turn;

a layer of insulation having a plurality of turns, each turn being at substantially a right angle to a previous turn and at a substantially a right angle to a next turn, the layer of insulation being adjacent to the conductor, and located between adjacent turns of the conductor, and being thinner than the thickness of the conductor;

wherein the inductor and the at least one additional inductor are in spaced apart relation to one another.

5. The cooking hob of claim 4, wherein the generator supplies power to the inductor and the at least one additional inductor.

6. The cooking hob of claim 4, wherein the inductor and the additional inductor generate flux, and the inductors are arranged so that flux is cumulative.

7. The cooking hob of claim 6, wherein there are an equal number of inductors per direction of flux.

8. The cooking hob of claim 4, further comprising:

a temperature sensor having heat conductive strips placed between the inductor and the at least one additional inductor, the strips measuring temperature data.

9. The cooking hob of claim 4, further comprising:

an illuminated indicator made up of illuminated segments mounted between the inductor and the at least one additional inductor;

a control circuit having a presence sensor to detect the presence of object above an inductor, the control circuit controlling the illuminated segment associated with the inductor in contact with said object.

10. The cooking hob of claim 4, further comprising:

a temperature sensor for detecting temperature between the inductor and the at least one additional inductor.

11. The cooking hob of claim 4, further comprising:

an illuminatable segment between the inductor and at least one additional inductor, said segment including a sensor for detecting the presence of an object to be heated and illuminating in response to presence of said object.

12. The cooking hob of claim 11, wherein the illumination of the illuminatable segment is proportional to temperature in the inductor and the at least one additional inductor.

13. The cooking hob of claim 3, wherein the inductor further comprises:

a second wound conductor with a rectangular cross section having a plurality of turns, each turn being at substantially a right angle to a previous turn and at substantially a right angle to a next turn; and

a second layer of insulation having a plurality of turns, each turn being at substantially a right angle to a previous turn and at substantially a right angle to a next turn, the layer of insulation being adjacent to the conductor, and located between adjacent turns of the conductor, and being thinner than the thickness of the conductor;

wherein the second conductor and second layer of insulation are wound in parallel with the conductor and layer of insulation.

14. The cooking hob of claim 3, further comprising;

a temperature sensor for detecting temperature near an inductor.

15. The cooking hob of claim 3, further comprising:

a temperature sensor for detecting temperature of an inductor.

16. A cooking hub supplied with a high frequency electric conductor comprising:

a wound conductor with a rectangular cross section having a plurality of turns, each turn being at substantially a right angle to a previous turn and at substantially a right angle to a next turn; and

a layer of insulation having a plurality of turns, each turn being at substantially a right angle to a previous turn and at substantially a right angle to a next turn, the layer of insulation being adjacent to the conductor, and located between adjacent turns of the conductor, and being thinner than the thickness of the conductor,

wherein the generator supplies power to the indicator,

a top surface formed by a protective electrically insulating layer underneath which the inductor is placed;

a layer of ferrite underneath the inductor in order to loop the magnetic circuit of the inductor;

a heat diffuser forming a magnetic screen underneath the layer of ferrite;

a printed circuit board bearing the components of the generator associated with the inductor, this board being mounted underneath the diffuser, power components of the board being in heat-conduction contact therewith;

the conductors being directly connected to the printed circuit;

at least one of the supply conductors of the inductor passing through current sensors prior to the supply conductors being connected to the printed circuit.

17. A hob as claimed in claim 16 wherein the diffuser is made from a single part and the diffuser forms a ventilation passage on the side directed towards the coil and heat-exchanger fins project into this passage.

18. A hob as claimed in claim 16 wherein the difuser is made of more than one part, each part being in heat transfer contact with another part, and the diffuser forms a ventilation passage on the side directed towards the coil and heat-exchanger fins project into this passage.

19. A hob as claimed in claim 16, wherein at least one of the power components is in direct electrical contact with the diffuser.