INDUCTION HOB

Abstract

The invention relates to an induction hob comprising at least one switching element and at least one induction coil (3), the switching element providing an alternating current flow through said induction coil (3) and cooling means (4) providing an airflow through the induction hob for cooling said switching element and said induction coil (3). The induction coil (3) is arranged at a first side (5.1) of a first plate-shaped support element (5) and the switching element is arranged at a first side (6.1) of a second plate-shaped support element (6), wherein the first support element (5) and the second support element (6) are connected to one another and arranged at a distance (d) in order to form an air channel (7) between the first and second support element (5, 6) and wherein the cooling means (4) are arranged such that an airflow is provided through said air channel (7).

Claims

1. Induction hob comprising at least one switching element and at least one induction coil, the switching element providing an alternating current flow through said induction coil and cooling means providing an airflow through the induction hob for cooling said switching element and said induction coil, wherein the induction coil is arranged at a first side of a first plate-shaped support element and the switching element is arranged at a first side of a second plate-shaped support element, wherein the first support element and the second support element are connected to one another and arranged at a distance in order to form an air channel between the first and second support elements, and wherein the cooling means are arranged such that an airflow is provided through said air channel.

2. Induction hob according to claim 1, said at least one switching element comprising a plurality of switching elements and said at least one induction coil comprising a plurality of induction coils, wherein said plurality of induction coils is arranged at said first side of said first plate-shaped support element and said plurality of switching elements is arranged at said first side of said second support element.

3. Induction hob according to claim 1, wherein the first and second plate-shaped support elements are made of a material comprising thermal conductivity greater than 200 W/(m*K), said material being selected from the group consisting of aluminum, copper and metal alloys thereof. a metal alloy comprising aluminium or copper.

4. Induction hob according to claim 1, wherein the first plate-shaped support element comprises a second side being arranged opposite to the first side of said first support element, wherein said second side of the first plate-shaped support element faces the second plate-shaped support element.

5. Induction hob according to claim 1, wherein the second plate-shaped support element comprises a second side being arranged opposite to the first side of said second support element, wherein said second side of the second plate-shaped support element faces the first plate-shaped support element.

6. Induction hob according to claim 1, wherein the first and the second support element form a sandwich-like plate arrangement, wherein the at least one switching element and the at least one induction coil are arranged at opposite sides of said sandwich-like plate arrangement.

7. Induction hob according to claim 1, wherein the distance between the first and the second support elements is between 10 mm and 20 mm.

8. Induction hob according to claim 1, wherein the at least one induction coil is in thermally conductive contact with the first side of the first support element and the at least one switching element is in thermally conductive contact with the first side of the second support element.

9. Induction hob according to claim 1, wherein the at least one induction coil is glued to the first side of the first support element.

10. Induction hob according to claim 1, wherein the at least one switching element is included in an electronic power module powering the induction coil and said power module is mounted on the first side of the second support element using Insulated Metal Substrate (IMS) technology.

11. Induction hob according to claim 1, wherein one of said plate-shaped support elements laterally protrudes beyond the other plate-shaped support element, wherein said protrusion is used for deflecting the air flow provided by said cooling means.

12. Induction hob according to claim 1, wherein the cooling means are adapted to provide an air flow in a flow direction that is inclined relative to the longitudinal direction of the air channel by an angle α, wherein a is between 25° and 45°.

13. Method for cooling at least one switching element and at least one induction coil of an induction hob by cooling means providing an airflow through the induction hob, the method comprising the steps of: providing a first plate-shaped support element, the at least one induction coil being arranged at a first side of said first plate-shaped support element; providing a second plate-shaped support element, the at least one switching element being arranged at a first side of said second plate-shaped support element, wherein the first support element and the second support element are connected to one another and arranged at a distance in order to form an air channel between the first and second support element; providing an airflow through said air channel for cooling said at least one switching element and said at least one induction coil by removing heat from the first and second support elements.

14. Induction hob according to claim 7, said distance being 12 mm, 14 mm, 16 mm or 18 mm.

15. An induction hob comprising a first, thermally conductive plate-shaped support element and a second, thermally conductive plate-shaped support element connected to and arranged at a distance from one another to form a sandwich structure defining an air channel between inner, adjacent faces of the first and second plate-shaped support elements, an induction coil mounted to and in thermally conductive contact with an outer face of the first plate-shaped support element opposite the inner face thereof, a switching element mounted to and in thermally conductive contact with an outer face of the second plate-shaped support element opposite the inner face thereof, a fan arranged to direct a flow of air along a flow direction toward, and at an angle, α, relative to, the inner surface of one of said first and second plate-shaped support elements, so that said flow of air will be deflected into said air channel to draw heat generated from said induction coil and from said switching element, respectively, from the first and second plate-shaped support elements, each of said first and second plate-shaped support elements having a thermal conductivity of at least 200 W/(m*K).

16. The induction hob of claim 15, said induction coil being glued to the outer face of said first plate-shaped support element via a thermally conductive adhesive, said switching element being mounted to the outer face of said second plate-shaped support element via an Insulated Metal Substrate (IMS) arrangement wherein said second support element forms a baseplate of said IMS arrangement and is covered by a dielectric layer, wherein a copper layer covers said dielectric layer and provides electrical connectivity to the switching element.

17. The induction hob of claim 15, said inner faces of both said first and second plate-shaped support elements being devoid of components that will impede said flow of air from flowing through said air channel.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The various aspects of the invention, including its particular features and advantages, will be readily understood from the following detailed description and the accompanying drawings, in which:

[0025] FIG. 1 shows a schematic view of an induction hob according to the current invention;

[0026] FIG. 2 shows an example induction hob module comprising a plate arrangement with a plurality of induction coils and a plurality of switching elements in a perspective top view;

[0027] FIG. 3 shows an example induction hob module comprising a plate arrangement with a plurality of induction coils and a plurality of switching elements in a side view; and

[0028] FIG. 4 shows an example induction hob module comprising a plate arrangement with a plurality of induction coils and a plurality of switching elements in a perspective rear view.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0029] The present invention will now be described more fully with reference to the accompanying drawings, in which example embodiments are shown. However, this invention should not be construed as limited to the embodiments set forth herein. Throughout the following description similar reference numerals have been used to denote similar elements, parts, items or features, when applicable.

[0030] FIG. 1 shows an induction hob 1 according to an embodiment. The induction hob 1 comprises a cooking surface 10, e.g. a glass ceramic plate and a plurality of hob induction coils 3 which are placed beneath the cooking surface 10. The hob induction coils 3 may be arranged in a matrix-like manner. The hob induction coils 3 form heating elements being adapted to heat a piece of cookware 11 placed on the cooking surface 10 by induction heating.

[0031] FIGS. 2 to 4 show an arrangement of a plurality of induction coils 3 and a plurality of electronic power modules 8 which are mounted at a sandwich-like plate arrangement. Said electronic power modules 8 are adapted to provide electric power to said induction coils 3. More in detail, each electronic power module 8 comprises at least one switching element for providing an alternating current through a respective induction coil 3. The switching element may be, for example, an insulated-gate bipolar transistor (IGBT).

[0032] The plate arrangement comprises at least a first and a second plate-shaped support element 5, 6. Said support elements 5, 6 may be formed by a sheet material, specifically a planar sheet material. The plate-shaped support elements 5, 6 are connected to one another by interconnecting means. Said interconnecting means may be, for example, studs or bolts. By means of said interconnecting means, said support elements 5, 6 are arranged at a distance d to one another. Said distance may be in the range between 10 mm and 20 mm, for example 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm or 19 mm.

[0033] The induction coils 3 may be arranged at a first side 5.1 of the first support element 5. For example, the induction coils 3 may be arranged in rows, wherein the induction coils 3 of consecutive rows are offset by half the distance of consecutive induction coils 3. The induction coils 3 may be attached to the first side 5.1 of the first support element 5 such that a high thermal conductivity is achieved. For example, the induction coils 3 may be glued to the first side 5.1 of the first support element 5.

[0034] The electronic power modules 8 including the switching elements may be arranged at a first side 6.1 of the second support element 6. Regarding the sandwich-like plate arrangement, the first side 6.1 of the second support element 6 may be arranged opposite to the first side 5.1 of the first support element 5. In other words, the switching elements and the induction coils 3 may be arranged at opposite sides of the sandwich-like plate arrangement.

[0035] For example, the electronic power modules 8 may be mounted on the first surface 6.1 of the second support element 6 using Insulated Metal Substrate (IMS) technology. The second support element 6 forms the baseplate of the IMS structure which is covered by a dielectric layer. Said dielectric layer is covered by a copper layer providing the electrical connectivity to the switching element.

[0036] Due to the distance d between the first and second support element 5, 6 and the plate-like shape of the first and second support element 5, 6, an air channel 7 is formed between the first and second support element 5, 6. More in detail, the second sides 5.2, 6.2 of the first and second support element 5, 6 laterally confine an air channel 7 through which heat emitted by the switching elements and the induction coils 3 may be removed by the provision of an air flow. Preferably, said second sides 5.2, 6.2 of the first and second support element 5, 6 do not or essentially not comprise any components or devices which may impede the air flow through the air channel 7.

[0037] In order to enable an effective heat transfer to the second sides 5.2, 6.2 of the first and second support element 5, 6, i.e. the sides confining the air channel 7, the support elements 5, 6 may be formed out of a material comprising a high thermal conductivity, for example a thermal conductivity greater than 200 W/(m*K). Preferably, the support elements 5, 6 may be made of aluminium, copper, or a metal alloy comprising aluminium or copper.

[0038] For providing an air flow through the air channel 7 in order to remove heat provided by the switching elements and the induction coils 3, cooling means 4 are arranged at the plate arrangement. Said cooling means 4 may comprise one or more fans, for example, axial, radial or tangential fans. Said cooling means 4 may provide an air flow in a flow direction FD, wherein said flow direction FD is inclined relative to the longitudinal direction LD of the air channel 7 by an angle α. Said angle α may be in the range between 25° and 45°, preferably 30°, 35° or 40° and may open in a direction opposite to the plate arrangement. The air flow provided by the cooling means 4 may be deflected by one of said support elements 5, 6 and thereby guided into the air channel 7.

[0039] Preferably, the cooling means 4 may be adapted to provide an upwardly directed air flow which is deflected by the first support element 5 forming the upper support element of said support element arrangement. For example, the first support element 5 may laterally protrude beyond the second support element 6 and the cooling means 4 may be adapted to provide an air flow towards the second side 5.2 of the first support element 5. By means of said first support element 5, the air flow is redirected into the longitudinal direction LD of the air channel 7.

[0040] By means of upper-mentioned plate arrangement comprising the induction coils 3 and the switching elements, an effective cooling of said induction coils 3 and said switching elements is achieved paired with a compact design thereby reducing the necessary installation space.

[0041] It should be noted that the description and drawings merely illustrate the principles of the proposed methods and systems.

[0042] Those skilled in the art will be able to implement various arrangements that, although not explicitly described or shown herein, embody the principles of the invention.

LIST OF REFERENCE NUMERALS

[0043] 1 induction hob [0044] 3 induction coil [0045] 4 cooling means [0046] 5 first support element [0047] 5.1 first side [0048] 5.2 second side [0049] 6 second support element [0050] 6.1 first side [0051] 6.2 second side [0052] 7 air channel [0053] 8 electronic power module [0054] 10 cooking surface [0055] 11 piece of cookware [0056] α angle [0057] d distance [0058] FD flow direction [0059] LD longitudinal direction