Induction hob and method for controlling an induction hob

Patent metadata

Field	Value
Publication number	US-2016150600-A1
Application number	US-201514951182-A
Country	US
Kind code	A1
Filing date	Nov 24, 2015
Priority date	Nov 25, 2014
Publication date	May 26, 2016
Grant date	—

Abstract

An induction hob has a hob plate, a plurality of induction heating coils arranged under the hob plate and a plurality of sensor coils arranged under the hob plate. The induction heating coils are rectangular, wherein at least two induction heating coils are arranged one behind the other and at least three induction heating coils are arranged one next to the other. Two adjacent induction heating coils form an adjacent region with one another in which the two induction heating coils lie with their adjacent sides. At least one sensor coil is arranged in each adjacent region, wherein precisely a single sensor coil is provided in a spacing direction from the one induction heating coil to the adjacent induction heating coil.

First claim

That which is claimed:

1 . An induction hob comprising:
a hob plate; a plurality of induction heating coils arranged under said hob plate; and a plurality of sensor coils arranged under said hob plate,
wherein:
said induction heating coils are embodied to be rectangular or approximately rectangular; at least two of said induction heating coils are arranged one behind the other and at least three of said induction heating coils are arranged one next to the other; two adjacent of said induction heating coils form an adjacent region with one another, wherein said two induction heating coils lie with sides adjacent to each other in said adjacent region; at least one sensor coil is arranged in each said adjacent region; and precisely one single of said sensor coils is provided in a spacing direction from one of said induction heating coils to adjacent one of said induction heating coils.

2 . The induction hob according to claim 1 , wherein at least two said sensor coils are provided one next to another along said adjacent sides of said induction heating coils in at least one said adjacent region.

3 . The induction hob according to claim 1 , wherein a centre point of one of said sensor coils lies between two of said adjacent sides of said induction heating coils.

4 . The induction hob according to claim 1 , wherein one of said sensor coils is arranged above a central region of one of said induction heating coils.

5 . The induction hob according to claim 1 , wherein all said induction heating coils are embodied so as to be of equal size.

6 . The induction hob according to claim 1 , wherein all said induction heating coils have a same winding direction.

7 . The induction hob according to claim 1 , wherein precisely one single sensor coil is arranged in adjacent regions on two of said induction heating coils being arranged with their short sides adjacent to one another.

8 . The induction hob according to claim 7 , wherein precisely two sensor coils are provided in adjacent regions between two induction heating coils being arranged with their long sides adjacent to one another.

9 . The induction hob according to claim 1 , wherein said sensor coils are not distributed uniformly or symmetrically along said long sides, but rather are shifted towards a central region of said induction hob, and away from an edge of said induction hob.

10 . The induction hob according to claim 1 , wherein, in adjacent regions between two of said adjacent induction heating coils in which only single of said sensor coils is provided, said sensor coil is arranged centrally with respect to said longitudinal sides of said induction heating coil running in said adjacent regions.

11 . The induction hob according to claim 1 , wherein said sensor coils have a round shape.

12 . The induction hob according to claim 11 , wherein said sensor coils have ten to forty turns.

13 . The induction hob according to claim 1 , wherein said sensor coils are arranged at least partially above said induction heating coils, wherein said sensor coils overlap said induction heating coils uniformly and to a same degree in the same way.

14 . The induction hob according to claim 1 , wherein said induction heating coils have a single layer of turns, or said turns run in a single layer.

15 . The induction hob according to claim 1 , wherein said sensor coils are wound in a single layer and turns of said sensor coils run in a single layer.

16 . The induction hob according to claim 1 , wherein said sensor coils are provided with a temperature sensor in their central area.

17 . The induction hob according to claim 16 , wherein said temperature sensor is a temperature dependent resistor.

18 . A method for controlling an induction hob according to claim 1 , wherein said sensor coils are continuously operated or continuously sense whether a pan is placed on said hob plate above said sensor coils.

19 . The method according to claim 18 , wherein said resonant frequency of said sensor coils and of an evaluation circuit is significantly higher than a working frequency of said induction coils.

20 . The method according to claim 18 , wherein one of said induction coils is actuated only if at least one of said sensor coils is covered by a pan.

Assignees

• Ego Elektro Geraetebau Gmbh

Inventors

• Lomp Stephane
• Rupp Michael
• Dalaker Timo
• Stoeffler Michael
• Friedrich Hartmut
• Egenter Christian
• Mohr Wolfgang
• Eberle Michael
• Grunow Thorsten

Classifications

• H05B2213/05

  Heating plates with pan detection means · CPC title

• H05B6/36 Primary

  Coil arrangements · CPC title

• H05B6/062 Primary

  for cooking plates or the like · CPC title

• H05B2213/03

  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 title

• H05B6/065

  using coordinated control of multiple induction coils · CPC title