Induction cooking device

Abstract

The invention relates to an induction cooking device. The induction cooking device comprises: a earner which is provided with a control unit and is configured to be arranged under a worktop; and a frame which is connected to the carrier in use and which is configured to be placed in an opening arranged in the worktop, wherein the frame comprises an induction device comprising an induction coil for heating a pan placeable on the frame by means of induction, wherein the induction device is connectable to the carrier.

Description

[0001] INDUCTION COOKING DEVICE

[0002] The present invention relates to an induction cooking device. The invention further relates to a method for integrating an induction cooking device.

[0003] Induction hot plates are known in practice. Induction hot plates are hot plates wherein pans can be heated by means of induction heating. The known induction hot plates usually comprise an induction coil for generating a magnetic field which is configured to heat pans that are made at least partially of magnetizable material. In the induction coil the mains voltage is converted into an alternating current with a determined frequency, depending on the desired heat generation. The heating is generated by eddy currents that start to run through the pan as a result of the changing magnetic field. The eddy currents are converted into heat due to the resistance of the pan. In the known induction hot plates the induction coils and the control units are covered by a glass ceramic plate connected fixedly thereto.

[0004] The known hot plates usually have a glass ceramic plate on which a plurality of cooking hobs are provided. A plurality of induction coils, one for each cooking hob, are for this purpose arranged under the glass ceramic plate. Alternatively, there are also induction cooking devices wherein each cooking hob comprises a separate glass ceramic plate.

[0005] The known induction cooking devices are normally fixedly connected, for instance glued or bonded, to an opening in the worktop of the kitchen. A drawback hereof is that the surface of the glass ceramic plate is difficult to clean thoroughly, this reducing hygiene during cooking. A further drawback is that the glass of the induction cooking device is difficult to replace following damage, for instance due to scratching.

[0006] The present invention has for its object to obviate or at least reduce the above stated problems. It can be a particular object of the invention to provide an induction cooking device which increases hygiene during cooking and facilitates cleaning.

[0007] This object is achieved with a induction cooking device, wherein the induction cooking device comprises: a carrier which is provided with a control unit and is configured to be arranged under a worktop; a frame which is connected to the carrier in use and which is configured to be placed in an opening arranged in the worktop, wherein the frame comprises an induction device comprising an induction coil for heating a pan placeable on the frame by means of induction, wherein the induction device is connectable to the carrier.

[0008] The carrier and the frame, which are mutually connected in use, realize an induction cooking device which can be integrated in simple manner. A further advantage is that, owing to the construction of the induction cooking device, a distance can be provided between the frame in which the induction device is arranged and the worktop. Alternatively or additionally, the distance between the pan and the worktop is also increased. This results in less heat transfer to the worktop, which reduces the chances of breaking and / or cracking of the worktop during use of the induction cooking device.

[0009] The construction of the present invention provides for additional thermal separation between the frame and the worktop. This protects the worktop against an excess of heat, which greatly reduces the chances of cracking and / or tearing of the worktop.

[0010] Yet another advantage is that the frame is anchored firmly in the opening in the worktop by the connection between the frame and the carrier. Undesirable movements of the frame arranged in the opening are hereby largely or wholly prevented.

[0011] Because the carrier is arranged on the underside of the worktop and the frame is placeable in the opening from the upper side, a clamping connection is as it were realized in use between the carrier and the frame when the carrier and the frame are connected, wherein the worktop is positioned at least partially between the carrier and the frame. This clamping is optionally realized by adjusting screws which are arranged on the carrier and which are placed against the underside of the worktop. A support edge of the frame here preferably rests on the upper side of the worktop.

[0012] The induction device is connectable to the carrier so that the control unit of the carrier is operatively connected to the induction coil. This enables the control unit to set the amount of current through the induction coil. The control unit can be configured to set the frequency of the induction coil. The carrier can comprise a power connection which is configured to be connected to the mains voltage. The induction device can be connected operatively to the carrier.

[0013] The frame can be a receptacle in which the induction coil is positioned. The carrier is connected to the frame, at least during use. The carrier is preferably physically connected to the frame. In use the induction coil is operatively connected to the control unit of the carrier, so that the carrier is able to set the amount of current through the induction coil and thereby the amount of heat released to the removable pan support element.

[0014] The frame can be provided with a coil holder and a pan support element. The coil holder is preferably fixedly connected to the carrier, for instance by brackets. The coil holder can be provided with the induction device. The pan support element is preferably connectable to the coil holder, preferably with a physical connection. For installation of the induction cooking device the carrier and the frame can be positioned under the worktop. The frame can then be placed through the openings of the worktop, after which the pan support element is connected to the coil holder. This connection can comprise a bayonet closure or bayonet connection. Other connections, such as clamping connections or screw connections, are also possible. The pan support element can be provided with a support edge which is configured to rest on the peripheral edge of the opening in the worktop. This achieves an effective installation of the induction cooking device on the worktop.

[0015] A further advantage is that the pan support element can be easily replaced with such a construction. This is particularly advantageous in the case that the pan support element is a glass plate, since the glass plate might become scratched during use.

[0016] The frame can be made at least partially of ceramic material, ABS, a heat-resistant plastic such as Ketron PEEK, Techtron, polyamide 66 or nylon 66, PPS, Fluorosint, and / or Symalit PVDF, stainless steel, steel, and / or aluminium.

[0017] The carrier is preferably provided with an upper side which extends parallel to the underside of the worktop in use. The upper side of the carrier is directed toward the underside of the worktop. The upper side of the carrier is preferably plate-like.

[0018] Being connected in use can also be understood to mean a carrier connected to the frame or, alternatively, a carrier connectable to the frame.

[0019] In an embodiment according to the invention a plurality of frames are provided on each carrier, these frames each being configured to be placed through a respective opening arranged in the worktop. In the context of the present application a plurality of frames should be understood to mean at least two, at least three, at least four, at least five or at least six frames.

[0020] In an embodiment according to the invention the frame is placeable in the opening from above the worktop so as to be connected to the carrier arranged under the worktop.

[0021] Because the frame is placeable from above the worktop and the carrier from below, arranging of the induction cooking device is greatly simplified.

[0022] In an alternative embodiment according to the invention the carrier and at least a part of the frame are placeable in the openings of the worktop from below so as to be connected to the pan support element arranged above the worktop.

[0023] Because the carrier and the frame are both placeable from below, only the pan support element need then still be connected to the rest of the frame from above the worktop. This greatly simplifies arranging of the induction cooking device on, in or at the worktop.

[0024] In the context of the present application the pan support element can be seen as part of the frame in that it is connected to the frame.

[0025] In an embodiment according to the invention the induction cooking device further comprises a removable pan support element which is arranged on the frame and which is configured to support a pan.

[0026] An advantage of the pan support element is that the pan support element or a part of this element can be removed from the frame in simple manner. This makes the pan support element easier to clean. With the induction cooking device according to the invention it is thus possible to wash the pan support element in a dishwasher. This enables the pan support element to be cleaned better than a fixed glass ceramic plate of the known induction cooking device. This increases the hygiene of the induction cooking device, which decreases the chances of the user of the induction cooking device developing an illness or food poisoning.

[0027] A further advantage of the removable pan support element is that the edge which is created between the removable pan support element and the worktop of the kitchen can be cleaned in simple manner. Any food residues which may have remained under the edge can be removed in simple manner by removing the removable pan support element. This increases the hygiene of the induction cooking device still further.

[0028] By arranging the pan support element on the frame the pan support element forms part of the frame.

[0029] The pan support element is preferably circular. A pan, which is usually also circular, can hereby be placed stably on the pan support element.

[0030] The removable pan support element is preferably positioned on an upper side of the worktop, at least in use. The pan support element is preferably positioned on an upper side of the frame. Un underside of the frame is preferably connected to an upper side of the carrier. The upper side of the carrier is preferably directed toward an underside of the worktop. The underside of the carrier is preferably directed toward a ground surface.

[0031] The removable pan support element can be made at least partially of cast iron, stainless steel, steel, silicone, a heat-resistant plastic such as Ketron PEEK, Techtron, PPS, Fluorosint, and / or Symalit PVDF, and / or aluminium.

[0032] In an embodiment according to the invention the removable pan support element comprises an at least partially glass plate.

[0033] The at least partially glass plate is made at least partially of glass. In the present application the at least partially glass plate is also understood to mean a glass ceramic plate.

[0034] In an embodiment the (removable) pan support element is made from a panel of Micanite with a layer of High Pressure Laminate (HPL), ceramic material, stone or glass thereon. Any possible combination of materials is possible here.

[0035] An advantage of the at least partially glass plate is that it is easy to clean. A further advantage is that the at least partially glass plate has a flat surface, whereby less residual dirt will remain thereon. This increases the hygiene of the removable pan support element.

[0036] In an embodiment according to the invention the removable pan support element comprises a filler body, wherein the filler body preferably comprises a body removed from the opening of the worktop.

[0037] The body preferably has a size which is substantially equal to the opening in the worktop. This can be realized by using the body removed from the opening as removable pan support element and / or as filler body in the removable pan support element. A body removed from the opening can alternatively be fixedly connected to the frame. This can optionally be realized by means of a glue connection. In this embodiment it is possible to arrange a removable pan support element, optionally provided with an at least partially glass plate, on the body which is connected fixedly to the frame. The filler body can be made of any suitable material, such as ceramic material.

[0038] An advantage of the body is that the material of the body is the same as the worktop. Because the body has the same material, a material saving is realized for the induction cooking device. This reduces the manufacturing costs of the induction cooking device. A further advantage is that the design of the worktop can be incorporated in the pan carriers.

[0039] In an embodiment according to the invention a temperature conduction element, which is configured to conduct heat to a temperature sensor arranged under the pan support element, is arranged in the filler body, wherein the temperature conduction element is preferably made of non- magnetizable material.

[0040] Het temperature conduction element is preferably made of non-magnetizable material so that the temperature conduction element itself does not heat up under the effect of the induction coil. The non-magnetizable material preferably comprises copper.

[0041] An advantage of the temperature conduction element is that the temperature sensor which is arranged under the pan support element can measure the heat of the pan placed on top of the pan support element at least partially. This prevents overheating of the pan and the upper side of the pan support element. This increases the safety of the induction cooking device. This is particularly relevant if the filler body is made of substantially poorly heat-conducting material, such as for instance polyphenylene sulfide (PPS).

[0042] In an embodiment the temperature conduction element comprises two different materials, wherein a first material is a heat conductor and the second material has an insulating function. The second material is therefore also referred to as an insulator. With the combination of the first and second material a desired heat conduction coefficient of the temperature conduction element can be achieved. The thickness of the materials and the type of materials opted for are preferably such that a heat conduction coefficient of the temperature conduction element is similar to the heat conduction coefficient of ceramic glass.

[0043] An advantage of realizing a heat conduction coefficient equal to ceramic glass is that standard temperature sensors and control units can be used. This lowers the production costs of the device.

[0044] In an embodiment the first material is copper with a heat conduction coefficient of 150 W / (m-K) and the second material is a silicone material with a heat conduction coefficient of 0.2 W / (m-K). By arranging a layer of the second material above or under the first material the heat conduction coefficient of ceramic glass, which amounts to about 0.9 W / (m-K), can be realized. In an embodiment according to the invention the device further comprises a temperature sensor arranged under the pan support element.

[0045] The temperature sensor is preferably operatively connected to the control unit. On the basis of the transmitted measurement values of the temperature by the temperature sensor the control unit can switch off the induction coil, or in any case reduce the power frequency. With the temperature sensor the pan and / or the pan support element is prevented from becoming too warm and this resulting in damage to the pan and / or the pan support element. The temperature sensor is preferably arranged above the induction coil.

[0046] In an embodiment according to the invention the device further comprises a number of electronic knobs which are operatively connected to a second control unit, wherein each of the electronic knobs comprises an activation switch which is configured to send an activation signal to the control unit on the basis of an activation operation.

[0047] The activation switch is preferably a physical switch. The physical switch can preferably be activated by the activation operation. The activation operation can for instance be a pushing movement. The second control unit is configured to switch the number of electronic knobs off to a rest state. The activation operation sends an activation signal to the control unit, which can activate the power supply to the number of electronic knobs for the number of electronic knobs on the basis of the activation signal. The number of electronic knobs is hereby switched to the operational state.

[0048] The number of electronic knobs can comprise a physical switch which is operatively connected to an interface and which further comprise a display. The operational state of the induction coil can be shown on the display. A pushing movement onto the electronic knob causes the physical switch to make contact.

[0049] The number of electronic knobs is preferably connected in parallel to the second control unit. It is hereby possible that when one of the knobs is activated, each of the number of electronic knobs is activated by the second control unit.

[0050] In an embodiment according to the invention the number of electronic knobs has a rest state and an operational state, wherein in the rest state no power is supplied to the electronic knobs by the second control unit, wherein in the operational state the electronic knobs are supplied with power by the second control unit such that the induction coil is controllable, and wherein the second control unit switches the number of electronic knobs from the rest state to the operational state on the basis of the received activation signal.

[0051] The control unit referred to in the remainder of the application can also be referred to as first control unit. The first and second control unit are preferably separate control units which are connected to each other by means of a bus connection. In an embodiment the second control unit receives power supply from the first control unit. The control unit can switch the induction coil from the rest state to the operational state by switching on the supply voltage to the number of electronic knobs. The control unit can switch the induction coil from the operational state to the rest state by switching off the supply voltage to the number of electronic knobs. An advantage of the rest state is that the power consumption of the number of electronic knobs is zero in the rest state. This reduces the energy consumption of the device over its whole lifespan.

[0052] The number of electronic knobs can comprise 1, 2, 3, 4, 5 or more electronic knobs. Each of the number of electronic knobs is preferably configured to control an induction coil associated therewith.

[0053] In an embodiment according to the invention the induction cooking device further comprises a connection for connecting the frame to the carrier.

[0054] An advantage of the connection between the frame and the carrier is that a plurality of induction cooking devices can be connected to one single carrier in simple manner. The carrier can then function as the central control for the different induction devices, whereby the different induction coils can be controlled efficiently. The frames can hereby also be integrated in a worktop in modular manner.

[0055] Alternatively or additionally, the connection provides the option for the carrier to regulate the current through the different induction coils, thus preventing an excess of current being demanded by the induction cooking devices. This prevents the fuses in the meter cabinet from blowing.

[0056] In an embodiment according to the invention the connection comprises a bayonet closure.

[0057] The bayonet closure secures the frame to the carrier in such a manner that it cannot come loose easily. A pin or protrusion which can be displaced in a slot can for example be provided on the carrier, wherein the slot is arranged in the frame. Alternatively or additionally, a pin or protrusion which can be displaced in a slot can also be provided on the frame, wherein the slot is arranged in the carrier.

[0058] In an embodiment according to the invention the connection comprises a clamping ring.

[0059] With the clamping ring the induction cooking device can be mounted stably in the opening of the worktop.

[0060] In embodiment according to the invention the pan support element and the frame are provided with a support element locking for the purpose of locking the pan support element to the frame.

[0061] The removable pan support element is held at the desired position above the frame by the support element locking. This reduces the chances of pans sliding, tipping or falling. This increases the safety of the induction cooking device according to the invention during cooking. In an embodiment according to the invention the support element locking comprises a form locking.

[0062] The form locking can for instance be realized in that the removable pan support element comprises a circular recess on the underside, wherein the circular recess can be arranged over the circular upper plate of the frame. Form locking prevents shifting of the pan support element, while the pan support element is removable in simple manner at the same time.

[0063] In an embodiment according to the invention the support element locking comprises a bayonet closure.

[0064] A secured connection between the removable pan support element and the frame is realized by the bayonet closure. This reduces the chances of the removable pan support element moving during cooking. A pin or protrusion which can be displaced in a slot arranged in the frame can for example be provided on the pan support element. Alternatively or additionally, a pin or protrusion which can be displaced in a slot arranged in the removable pan support element can also be arranged on the frame.

[0065] In an embodiment according to the invention the carrier is provided with adjusting means for securing the carrier to the worktop.

[0066] With the adjusting means the induction cooking device can be adjusted to different thicknesses of the worktop. An induction cooking device which can be integrated in different worktops and / or kitchens is hereby obtained. The adjusting means enable the induction cooking device to be integrated in worktops with thicknesses in the range of 4-35 millimetres.

[0067] In an embodiment according to the invention the adjusting means comprise adjusting screws.

[0068] The adjusting screws are preferably provided through the upper side of the carrier. The length of the adjusting screws protruding from the carrier is adjustable by means of tightening the adjusting screws. After placing the frame and the carrier through the opening, and optionally after connecting the frame and the carrier, the adjusting screws can hereby be set to extend from the carrier to the underside of the worktop. The induction cooking device as a whole is hereby stably locked to or onto the worktop. A further advantage is that the induction cooking device is pressed water-tightly against the worktop by the adjusting screws. This reduces the chances of water damage to the induction device.

[0069] In an embodiment according to the invention the induction device comprises a protective element provided above the induction coil.

[0070] The protective element protects the induction device against dirt and / or water, this increasing the safety of the device. The protective element can be made at least partially of mica, micanite, ceramic material, micanite-reinforced glass, fibre-reinforced glass, and / or a heat-resistant plastic such as Ketron PEEK, Techtron, PPS, Fluorosint and / or Symalit PVDF.

[0071] In an embodiment according to the invention the protective element comprises a glass plate.

[0072] In an embodiment according to the invention the induction cooking device further comprises a spring element configured to push the induction coil toward the protective element.

[0073] An advantage of the spring element is that the induction coil is pushed against the pan support element, this preferably being a glass plate, and thereby upward. The induction coil is hereby positioned as close as possible to the surface of the pan. This increases the efficiency of the induction cooking device for heating the pan.

[0074] In an embodiment according to the invention the protective element comprises a watertight film arranged above the induction coil.

[0075] The watertight film prevents moisture from being able to leak to the induction coil if the pan support element were to break or crack. This minimizes the chances of dangerous situations, such as short-circuiting. The watertight film is particularly advantageous if the pan support element is made of glass. The watertight film is also applicable for removable pan support elements.

[0076] In an embodiment according to the invention the watertight film comprises a silicone elastomer film.

[0077] The silicone elastomer film has the advantageous properties that it is temperatureconducting, temperature-resistant, flame-extinguishing within 10 seconds (UL94 VO rating), sufficiently strong not to be damaged by possible shards, and is electrically insulating. A good temperature conduction is important for any temperature sensor that may be present. It will be apparent to the skilled person that any watertight film having similar or better properties compared to silicone elastomer film is suitable.

[0078] In an embodiment according to the invention the frame comprises a support edge which is configured to support on a peripheral edge of the opening of the worktop after being placed.

[0079] The support edge makes the frame placeable on the peripheral edge of the opening of the worktop in simple manner. The diameter of the support edge is preferably substantially greater than the diameter of the opening in the worktop.

[0080] In an embodiment according to the invention a clamping ring, which is positioned between the support edge and the peripheral edge in use, is arranged round the support edge.

[0081] In the current application a clamping ring can also be referred to as a mounting ring. With the clamping ring the induction cooking device can be mounted stably in the opening of the worktop. The clamping ring can be connected to the pan support element. After connection of the pan support element, the clamping ring is hereby positioned on the peripheral edge of the opening and the induction cooking device is connected to the worktop in effective manner.

[0082] In an embodiment according to the invention a ring is arranged around the pan support element, preferably a metal ring, for instance aluminium.

[0083] The pan support element is additionally strengthened by the ring which is arranged around the pan support element. This reduces the chances of damage to the removable pan support element if the pan support element were to fall. Arranging the ring round the pan support element particularly ensures that the pan support element is protected against lateral impact. This might for instance happen when a pan is placed onto the pan support element. The ring hereby reduces the chances of breaking and / or cracking of the pan support element.

[0084] The ring is preferably connected to the pan support element with a form connection. This makes the ring easily removable from the pan support element. An advantage hereof is that the ring is easy to clean, for instance by putting the ring in the dishwasher.

[0085] In an embodiment according to the invention the control unit comprises wireless communication means for connection to a mobile device.

[0086] The wireless communication means enable the control unit to be connected to a mobile device. The state of the induction cooking device can hereby be monitored, for instance by means of an app. The amount of current being fed to the induction device can alternatively or additionally be adjusted hereby. This enables the induction device to be switched off, even when the user is not present. This prevents the chances of overheating and / or fire, which increases the safety of the invention.

[0087] In an embodiment according to the invention a heat-conducting element, preferably a plate-like element, is provided on the carrier, wherein the heat-conducting element is configured to be positioned against an underside of the worktop.

[0088] The heat difference built up in the worktop is reduced by the heat-conducting element, which is preferably made substantially of aluminium. This reduces the tension which may have built up in the worktop. This prevents cracking of the worktop during use of the device according to the invention.

[0089] A further advantage of the heat-conducting element is that the point load caused by the adjusting screws is distributed uniformly over the worktop. This reduces the chances of breakage and / or cracks in the worktop.

[0090] In an embodiment it is also possible to provide a heat-conducting element in the frame. The heat-conducting element is then preferably provided under the body or under the removable pan support element.

[0091] The invention further relates to a kitchen provided with an induction cooking device according to the invention. The kitchen has similar effects and advantages as described for the induction cooking device.

[0092] The invention further relates to a method for integrating an induction cooking device, wherein the method comprises the following steps of: providing an induction cooking device according to the invention; placing the frame in an opening of a worktop; arranging the carrier from below the worktop; and connecting the frame and the carrier to each other by means of the connection.

[0093] The method has similar effects and advantages as described for the induction cooking device and the kitchen.

[0094] Further features, advantages and details of the invention are described on the basis of embodiments thereof, wherein reference is made to the accompanying drawings, in which: figure 1 shows a first example of an induction cooking device according to the invention; figure 2 shows a second example of an induction cooking device according to the invention; figure 3 shows a third example of an induction cooking device according to the invention; figure 4 shows an example of a kitchen according to the invention; figure 5 shows an example of a number of electronic knobs connected to the control unit; figures 6A-B show a fourth example of an induction cooking device according to the invention; figure 7 shows a fifth example of an induction cooking device according to the invention; figure 8 shows a schematic view of a sixth example of an induction cooking device according to the invention; figure 9 shows an enlarged view of a schematic view of a sixth example of an induction cooking device according to the invention; figure 10 shows a perspective cross-section of a sixth example of an induction cooking device; and figure 11 shows a perspective view of a sixth example of an induction cooking device according to the invention.

[0095] Induction cooking device 2 (figure 1) is provided in worktop 4 in kitchen 6. Worktop 4 comprises opening 8 in which induction cooking device 2 is placed. Induction cooking device 2 comprises a frame 10 and a carrier 12 connected to the frame. Carrier 12 is connected to frame 10 by means of bayonet closure 14. The bayonet closure comprises a pin 15 which is connected fixedly to carrier 12. In the shown attached state pin 15 has been displaced into slot 17, wherein slot 17 is arranged in frame 10. In the shown embodiment frame 10 is made of plastic.

[0096] Frame 10 is provided with a support edge 16. Support edge 16 is placed on periphery 18 of opening 8 of worktop 4. Because the diameter of support edge 16 is greater than the diameter of periphery 18, frame 10 remains positioned in opening 8. Frame 10 comprises induction coil 20. Induction coil 20 is pressed against glass plate 24 by means of springs 22. This increases the size of the magnetic field positioned above glass plate 24. In the shown embodiment glass plate 24 is a circular glass plate. Glass plate 24 is mounted onto frame 10.

[0097] Removable pan support element 40 is further arranged on top of frame 10. Removable pan support element 40 comprises a glass plate 42. Glass plate 42 are surrounded by ring 44. Ring 44 is provided with four protrusions 28. Removable pan support element 40 can gripped and removed in simple manner owing to protrusions 28. In the shown embodiment ring 44 is made of metal. Glass plate 42 has a form-fitting connection with frame 10. This on one hand makes removable pan support element 40 easily removable for cleaning, and on the other makes removable pan support element 40 a stable base for placing pans on in order to cook.

[0098] Carrier 12 is further provided with control unit 30. Control unit 30 is connected operatively to induction coil 20 and to adjusting unit 32. Adjusting unit 32 protrudes through opening 34 of worktop 4 of kitchen 6. The amount of current and / or the frequency through induction coil 20 can be set by turning rotary knob 36 of adjusting unit 32. Carrier 12 is further provided with adjusting means 46. In the shown embodiment adjusting means 46 are embodied as adjusting screws. By tightening adjusting screws 46 support edge 16 of frame 10 is pressed firmly against periphery 18, whereby frame 10 and carrier 12 are together connected stably to worktop 4.

[0099] Induction cooking device 102 (figure 2) is an alternative to induction cooking device 2. Induction cooking device 102 is also provided in worktop 104 in kitchen 106 and comprises a frame 110 and a carrier 112 connected to the frame. Carrier 112 is connected to frame 110 by means of bayonet closure 114. The bayonet closure comprises a pin 115 which is connected fixedly to carrier 112. In the shown attached state pin 115 has been displaced into slot 117, wherein slot 117 is arranged in frame 110.

[0100] Frame 110 is likewise provided with a support edge 116 which is placed on periphery 118 of opening 108 of worktop 104. Because the diameter of support edge 116 is greater than the diameter of periphery 118, frame 110 remains positioned in opening 108. Frame 110 comprises induction coil 120. Induction coil 120 is pressed against body 124 by means of springs 122. This increases the strength of the magnetic field positioned above body 124. In the shown embodiment body 124 is a circular body removed from opening 118 of worktop 104. Body 124 is mounted onto frame 110. Metal ring 126 is arranged round body 124. Metal ring 126 is provided with four protrusions 128. A removable pan support element 40 as described in figure 1 can also be arranged on body 124.

[0101] As in figure 1, carrier 112 is provided with a first control unit 130 which is connected to induction coil 120 and to adjusting unit 132. Adjusting unit 132 protrudes through opening 134 of worktop 104 of kitchen 106. The amount of electric current through induction coil 120 can be adjusted by turning rotary knob 136 of adjusting unit 132.

[0102] Induction cooking device 202 (figure 3), shown in exploded view, likewise comprises frame 210. Frame 210 is provided with induction coil 220. In the shown embodiment frame 210 is connected fixedly to carry a 212 in use, so not shown in figure 3. Removable pan support element 240 is arranged on top of frame 210. In order to mount induction cooking device 202 to worktop 204, frame 210 is placed through opening 208 of worktop 204, after which camping and sealing ring 248 is fastened on underside 250 of frame 210. Adjusting screws 246 can then be tightened in order to firmly fasten induction cooking device 202. Arranged on carrier 212 is heat-conducting plate 252, which in the shown embodiment is made of aluminium with a thickness of about 5 millimetres. Heat-conducting plate 252 is shown transparently in figure 3. The heat-conducting plate is pressed against underside 254 of worktop 204 in use by means of adjusting screws 246. The heat-conducting plate 252 comprises an opening 256 through which frame 210 is placed in use. In an embodiment it is also possible to provide heat-conducting plates in frame 210. The heat- conducting plate is then preferably provided under body 124 or under removable pan support element 40.

[0103] Kitchen 306 (figure 4) is provided with worktop 304. Induction cooking device 302 is arranged in worktop 304. Adjusting units 332 are configured to control the amount of current through the induction coil of induction cooking device 302.

[0104] Second control unit 430 (figure 5) is configured to control induction coil 420. Induction coil unit 420 is drawn schematically in figure 5, but can be both a single induction coil and a plurality of induction coils, such as 2, 3, 4 or 5 induction coils. Electronic knobs 432a, 432b, 432c, 432d, 432e are operatively connected to second control unit 430. Second control unit 430 can provide the supply voltage and the communication (in the shown embodiment on the basis of RS- 485) by means of cable 462. Electronic knobs 432a, 432b, 432c, 432d, 432e are connected in parallel to second control unit 430 by means of activation cables 464a, 464b, 464c, 464d, 464e.

[0105] Physical switches 466a, 466b, 466c, 466d, 466e are arranged at the end of activation cables 464a, 464b, 464c, 464d, 464e. Physical switches 466a, 466b, 466c, 466d, 466e can be activated by means of pressing down electronic knobs 432a, 432b, 432c, 432d, 432e. By pressing down one of the electronic knobs 432a, 432b, 432c, 432d, 432e an activation signal is sent to second control unit 430 via the respective activation cable 464a, 464b, 464c, 464d, 464e. Second control unit 430 can switch on the supply voltage for all electronic knobs 432a, 432b, 432c, 432d, 432e on the basis of the activation signal. Electronic knobs 432a, 432b, 432c, 432d, 432e are hereby switched from the rest state to the operational state. In the rest state no power is supplied to electronic knobs 432a, 432b, 432c, 432d, 432e. In the rest state it is hereby on one hand possible to save energy, since no electricity is being used, and on the other hand the user can switch all electronic knobs 432a, 432b, 432c, 432d, 432e on again in simple manner by simply pushing the knob.

[0106] Induction coil 520 (figure 6A) is arranged under pan support element 540. Pan 570 is provided on pan support element 540. Pan support element 540 can be both a removable pan support element and a fixed pan support element. In the shown embodiment pan support element 540 is a fixed pan support element made of ceramic glass. Temperature sensor 568 is arranged under pan support element 540. Temperature sensor 568 is connected operatively to first control unit 530. On the basis of the temperature measured by temperature sensor 568 first control unit 530 can switch off induction coil 520 or, alternatively, reduce the frequency of the current through induction coil 520.

[0107] In this alternative embodiment pan support element 640 (figure 6B) is made of polyphenylene sulfide (PPS). PPS has poor heat conduction compared to ceramic glass. This results in temperature sensor 668 not receiving adequate information regarding the temperature of pan 670 if pan support element 640 were to consist wholly of PPS. In order to obviate this problem a temperature conduction element 672 is arranged in the centre of pan support element 640. In the shown embodiment temperature conduction element 672 is made of copper. It will be apparent to the skilled person that temperature conduction element 672 can be made of any non- magnetizable heat-conducting material. It is thus possible in an embodiment to make temperature conduction element 672 of two different materials, for instance partially of copper and partially of silicone material. This makes it possible to obtain a desired heat conduction coefficient of temperature conduction element 672 through the thickness and the placement of the different materials. It is thus possible to realize the heat conduction coefficient of ceramic glass with temperature conduction element 672. A layer of silicone material is preferably placed on the upper side or underside of the copper part of temperature conduction element 672. Temperature conduction element 672 preferably extends over the whole thickness of pan support element 640. Because temperature conduction element 672 is positioned above temperature sensor 668, temperature sensor 668 can measure the temperature of pan 670. First control unit 630 can control induction coil 620 on the basis of the measured temperature.

[0108] Induction coil 720 (figure 7) comprises a coil and, arranged on the upper side and the underside, mica sheet 721. Mica sheet 721 comprises mica paper, glass fabric and ceramic paper which is bonded with silicone adhesive. Induction coil 720 is arranged in induction housing 723. Induction housing 723 is connected to pan support element 740. In the shown embodiment pan support element 740 is made of ceramic glass. Pan support element 740 supports on worktop 704 by means of mounting ring 741. Watertight film 774, which is made of silicone elastomer film, is provided between pan support element 740 and induction coil 720. Watertight film 774 hangs with side walls 776 over the side of induction coil 720. This gives watertight film 774 a U-shape. Induction coil 720 is hereby well-shielded from moisture on all sides if breakage were to occur in pan support element 740. It will be apparent to the skilled person that watertight film 774 can also be arranged on an induction coil 720 without mica sheets 721.

[0109] Induction cooking device 802 (figures 8 and 9) comprises carrier 812 and frame 810 connected thereto. Frame 810 comprises brackets 878, coil holder 880 and pan support element 840. Brackets 878 extend from carrier 812 to coil holder 880. Coil 820 is arranged in coil holder 880. Frame 810 is positioned in opening 808 of worktop 804. Pan support element 840 is provided with glass plate 842. Mounting ring 882 is connected to glass plate 842. In the shown embodiment glass plate 842 is bonded to mounting ring 882. Mounting ring 882 is provided with support edge 816 which rests on peripheral edge 818 of opening 808 in worktop 804. It will be apparent to the skilled person that in alternative embodiments element 842 can also be made of materials other than glass, for instance ceramic material or polyphenylene sulfide.

[0110] Frame 810 (figure 10) comprises bracket 878 which is connected to underside 881 of coil holder 880. In the shown embodiment coil holder 880 takes the form of a receptacle. Coil 820 is arranged in coil holder 880. Coil holder 880 is provided with opening 886. Opening 886 is configured to receive pin 884 of mounting ring 882. Mounting ring 882 is provided with support edge 816 which rests on peripheral edge 818 of opening 808. Mounting ring 882 is further provided with connecting part 833. Connecting part 883 is attached to glass plate 842, whereby mounting ring 882 is connected to glass plate 842. Mounting ring 882 and glass plate 842 together form pan support element 840. Due to the connection to coil holder 880, pan support element 840 forms part of frame 810.

[0111] Adjusting unit 832 (figure 11) comprises a knob 833 which is provided with display 835. Adjusting unit 832 protrudes with cylinder 841 through worktop 804. Cylinder 841 is provided with screw thread 837. Nut 839 can be tightened over screw thread 837, such that nut 839 is secured against underside 803 of worktop 804. This secures adjusting unit 832 to worktop 804 in effective manner.

[0112] In an embodiment according to the invention carrier 812 and frame 810, which are fixedly connected to each other, are positioned under worktop 804. Carrier 812 and frame 810 are then moved upward toward worktop 804, such that frame 810 is positioned in opening 808 of worktop 804. Coil holder 880 of frame 810 must be inserted through opening 808 such that opening 886 of bayonet closure 814 protrudes above upper side 805 of worktop 804.

[0113] Pan support element 840 can then be connected to the rest of frame 810. For this purpose pin 884 of mounting ring 882 is inserted into opening 886 of coil holder 880. It will be apparent to the skilled person that opening 886 of coil holder 880 can be reached by pin 884 by means of a slot. Arranging pin 884 in opening 886 connects pan support element 840 to coil holder 880. The whole of induction cooking device 802 can then be positioned such that support edge 816 of mounting ring 882 engages on peripheral edge 818 of opening 808. Adjusting screws 846 are then tightened so that they press against underside 803 of worktop 804. An effective clamping connection is hereby achieved, wherein support edge 816 presses onto upper side 805 of worktop 804 and adjusting screws 846 press onto underside 803 of worktop 804. Induction cooking device 802 is hereby mounted in worktop 804 in effective manner. An additional locking screw which protrudes through mounting ring 882 and coil holder 880 is optionally arranged. The present invention is by no means limited to the above described embodiments thereof.

[0114] The rights sought are defined by the following claims, within the scope of which many modifications can be envisaged.

Claims

CLAIMS1. Induction cooking device, comprising: a carrier which is provided with a control unit and is configured to be arranged under a worktop; and a frame which is connected to the carrier in use and which is configured to be placed in an opening arranged in the worktop, wherein the frame comprises an induction device comprising an induction coil for heating a pan placeable on the frame by means of induction, wherein the induction device is connectable to the carrier.

2. Induction cooking device according to claim 1, wherein at least a part of the frame is placeable in the opening from below the worktop so as to be connected to a pan support element arranged above the worktop.

3. Induction cooking device according to claim 1 or 2, further comprising a plurality of frames which are connected to the carrier, wherein each of the plurality of frames is configured to be placed through a respective opening arranged in the worktop,4. Induction cooking device according to claim 1, 2 or 3, further comprising a removable pan support element which is arranged on the frame and which is configured to support a pan.

5. Induction cooking device according to claim 4, wherein the removable pan support element comprises a glass plate.

6. Induction cooking device according to claim 4, wherein the removable pan support element comprises a filler body, wherein the filler body preferably comprises a body removed from the opening of the worktop.

7. Induction cooking device according to claim 6, wherein a temperature conduction element, which is configured to conduct heat to a temperature sensor arranged under the pan support element, is arranged in the filler body, wherein the temperature conduction element is preferably made of non-magnetizable material.

8. Induction cooking device according to any one of the foregoing claims, further comprising a temperature sensor arranged under the pan support element.

9. Induction cooking device according to any one of the foregoing claims, further comprising a number of electronic knobs which are operatively connected to the control unit, wherein each of the electronic knobs comprises an activation switch which is configured to send an activation signal to the control unit on the basis of an activation operation.

10. Induction cooking device according to claim 9, wherein the number of electronic knobs has a rest state and an operational state, wherein in the rest state no power is supplied to the electronic knobs by the control unit, wherein in the operational state the electronic knobs are supplied with power by the control unit in order to control the induction coil, and wherein the control unit switches the electronic knobs from the rest state to the operational state on the basis of the received activation signal.

11. Induction cooking device according to any one of the foregoing claims, further comprising a connection for connecting the frame to the carrier.

12. Induction cooking device according to claim 11, wherein the connection comprises a bayonet closure.

13. Induction cooking device according to claim 11 or 12, wherein the connection comprises a clamping ring.

14. Induction cooking device according to any one of the foregoing claims, wherein the pan support element and the frame are provided with a support element locking for the purpose of locking the pan support element to the frame.

15. Induction cooking device according to claim 14, wherein the support element locking comprises a form locking.

16. Induction cooking device according to claim 14 or 15, wherein the support element locking comprises a bayonet closure.

17. Induction cooking device according to any one of the foregoing claims, wherein the carrier is provided with adjusting means for securing the carrier to the worktop.

18. Induction cooking device according to claim 17, wherein the adjusting means comprise adjusting screws.

19. Induction cooking device according to any one of the foregoing claims, wherein the induction device comprises a protective element which is provided above the induction coil.

20. Induction cooking device according to claim 19, wherein the protective element comprises a glass plate.

21. Induction cooking device according to claim 19 or 20, further comprising a spring element configured to push the induction coil toward the support element.

22. Induction cooking device according to any one of the claims 19-21, wherein the protective element comprises a watertight film arranged above the induction coil.

23. Induction cooking device according to claim 22, wherein the watertight film comprises a silicone elastomer film.

24. Induction cooking device according to any one of the foregoing claims, wherein the frame comprises a support edge which is configured to support on a peripheral edge of the opening of the worktop after being placed.

25. Induction cooking device according to claim 24, wherein a clamping ring, which is positioned between the support edge and the peripheral edge in use, is arranged round the support edge.

26. Induction cooking device according to any one of the foregoing claims, wherein a metal ring is arranged round the pan support element.

27. Induction cooking device according to any one of the foregoing claims, wherein the control unit comprises wireless communication means for connection to a mobile device.

28. Induction cooking device according to any one of the foregoing claims, wherein a heat- conducting element, preferably a plate-like element, is provided on the carrier, wherein the heat-conducting element is configured to be positioned against an underside of the worktop.

29. Kitchen provided with an induction cooking device according to any one of the claims 1-30. Method for integrating an induction cooking device, comprising of: providing an induction cooking device according to any one of the claims 1-28; placing the frame in an opening of a worktop; arranging the carrier from below the worktop; and - connecting the frame and the carrier to each other by means of the connection.

31. Method according to claim 30, wherein placing the frame in the opening of the worktop comprises of placing the frame through the opening from below the worktop, and wherein connecting the frame and the carrier to each other comprises of connecting the frame to the pan support element arranged above the worktop.

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