Induction cooking hob

Patent metadata

Field	Value
Publication number	US-10912158-B2
Application number	US-201615778394-A
Country	US
Kind code	B2
Filing date	Nov 15, 2016
Priority date	Dec 2, 2015
Publication date	Feb 2, 2021
Grant date	Feb 2, 2021

Abstract

The present invention relates to an induction cooking hob (10), in particular for a domestic appliance, comprising an optically transparent panel (12) for supporting cooking utensils, at least one illumination panel (14) arranged beneath the optically transparent panel (12), and at least one circuit board (18) arranged beneath the illumination panel (14), wherein said circuit board (18) includes a plurality of induction coils (16).

First claim

The invention claimed is:

1. An induction cooking hob, comprising:
an optically transparent panel for supporting cooking utensils,
at least one illumination panel arranged beneath the optically transparent panel,
at least one circuit board arranged beneath the illumination panel, wherein said circuit board includes a plurality of induction coils;
at least one pressure blower arranged at a margin of the circuit board, and
at least one suction blower arranged at a margin of the circuit board opposite from said at least one pressure blower,
wherein a gap is formed between the optically transparent panel and the illumination panel so that a further air stream runs between said optically transparent panel and said illumination panel from an outlet of the pressure blower to an inlet of the suction blower,
wherein a distance between the optically transparent panel and the illumination panel is between 1 mm and 5 mm, and
wherein a temperature sensing foil is attached at a bottom side of the optically transparent panel in order to control the pressure blower and the suction blower.

2. The induction cooking hob according to claim 1 , wherein an air stream is moved or movable between the illumination panel and the circuit board from an outlet of the pressure blower to an inlet of the suction blower.

3. The induction cooking hob according to claim 1 , wherein the illumination panel includes a plurality of light source elements arranged in a matrix form.

4. The induction cooking hob according to claim 1 , wherein the illumination panel is a thin film transistor (TFT) panel.

5. The induction cooking hob according to claim 1 , wherein the induction cooking hob comprises a casing, wherein said casing and the optically transparent panel form a closed or a substantially closed box.

6. The induction cooking hob according to claim 1 , wherein the induction coils are arranged on a top side of the circuit board.

7. The induction cooking hob according to claim 1 , wherein a plurality of electronic circuit elements is arranged at a bottom side of the circuit board.

8. The induction cooking hob according to claim 1 , wherein a distance between the illumination panel and the induction coils is between 1 mm and 5 mm.

9. The induction cooking hob according to claim 1 , wherein the pressure blower and/or the suction blower is an axial blower or are axial blowers, respectively, wherein a rotation axis of each said axial blower extends parallel to the corresponding circuit board margin.

10. The induction cooking hob according to claim 1 , wherein neighboring ones of said induction coils are spaced from each other so that gaps are formed between them.

11. The induction cooking hob according to claim 1 , wherein a plurality of temperature sensors is arranged as matrix inside the induction cooking hob, wherein said temperature sensors are provided for detecting a temperature of a cooking utensil upon the optically transparent panel, and wherein a distance between neighboured temperature sensors is between 5 cm and 10 cm.

12. The induction cooking hob according to claim 1 , said suction blower being arranged opposite to the pressure blower.

13. The induction cooking hob according to claim 2 , wherein another air stream is moved or movable beneath the circuit board from an outlet of the suction blower to an inlet of the pressure blower.

14. An induction cooking hob, comprising an optically transparent panel and a casing having an open top covered by said optically transparent panel in order to form a substantially closed box therebetween, an illumination panel located beneath said optically transparent panel and being selected from among a TFT display, an LCD display and a dot-matrix display, and a circuit board comprising a plurality of induction coils on an upper surface thereof located beneath the illumination panel, said illumination panel and said circuit board being disposed in said casing, said illumination panel comprising an plurality of light source elements arranged in a matrix and effective to illuminate said optically transparent panel independent of any arrangement or position of said induction coils, a pressure blower in said casing and a suction blower opposite said pressure blower in said casing, gap of at least 2 mm between said optically transparent panel and said illumination panel defining a first cooling pathway from an outlet of said pressure blower to an inlet of said suction blower, a first spacing of at least 2 mm between said illumination panel and said induction coils defining a second cooling pathway from said outlet of said pressure blower to said inlet of said suction blower, and a second spacing between a bottom surface of said circuit board and a bottom wall of said casing defining a return pathway from an outlet of said suction blower to an inlet of said pressure blower, wherein in operation first and second parallel air streams can be delivered via the respective first and second cooling pathways from said outlet of said pressure blower to said inlet of said suction blower, and a return air stream can be delivered via the return pathway from said outlet of said suction blower to said inlet of said pressure blower, wherein said return air stream will be antiparallel to said first and second air streams.

15. The induction cooking hob according to claim 14 , wherein the optically transparent panel is a glass ceramic panel, the induction cooking hob further comprising a temperature-sensing foil attached at a lower side of the glass ceramic panel in order to control said pressure blower and said suction blower, and a plurality of temperature sensors arranged in a matrix beneath the glass ceramic panel and/or beneath the illumination panel in order to detect temperatures of one or a plurality of cooking vessels arranged upon the glass ceramic panel during use.

Assignees

• Electrolux Appliances AB

Inventors

• Holzinger Jochen
• Hoffmann Harald

Classifications

• H05B6/1218 Primary

  with arrangements using lights for heating zone state indication · CPC title

• H05B6/1263

  using coil cooling arrangements · 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

• H05B6/1272

  with more than one coil or coil segment per heating zone · CPC title