INDUCTION COOKING DEVICE AND METHOD

Abstract

The present disclosure provides an induction cooking device for heating a cooking vessel. The induction cooking device comprises a cooking surface comprising a cooking hob, an induction coil, a driving circuit electrically coupled to the induction coil, and a coil mount that is arranged under cooking hob. The induction coil is arranged on the coil mount and the coil mount is configured to dynamically adapt the distance between the induction coil and the cooking surface based on a temperature of the induction coil and/or at least a component of the driving circuit. The coil mount is configured to increase the distance between the induction coil and the cooking surface with increasing temperature of the induction coil and/or the at least one component of the driving circuit. Further, the present invention provides a respective method.

Claims

1. An induction cooking device for heating a cooking vessel, the induction cooking device comprising: a cooking surface comprising a cooking hob, an induction coil, a driving circuit electrically coupled to the induction coil, and a coil mount that is arranged under the cooking hob, wherein the induction coil is arranged on the coil mount and wherein the coil mount is configured to dynamically adapt the distance between the induction coil and the cooking surface based on a temperature of the induction coil and/or at least a component of the driving circuit, wherein the coil mount is configured to increase the distance between the induction coil and the cooking surface with increasing temperature of the induction coil and/or the at least one component of the driving circuit.

2. The induction cooking device according to claim 1, wherein the coil mount comprises a movable carrying structure configured to carry the induction coil, and a number of actuators configured to change the distance of the movable carrying structure from the cooking surface.

3. The induction cooking device according to claim 2, wherein the actuators comprise a flexible body and a phase change material provided in the flexible body.

4. The induction cooking device according to claim 3, wherein the phase change material comprises a salt hydrate and/or a paraffin and/or a bio-based phase change material.

5. The induction cooking device according to claim 2, wherein the actuators comprise electromechanical actuation elements and respective driving circuits.

6. The induction cooking device according to claim 5, comprising a distance control unit and a temperature sensor that is configured to measure the temperature of the induction coil and/or the at least one component of the driving circuit and that is coupled to the distance control unit, wherein the distance control unit is configured to control the actuators based on a temperature measured by the temperature sensor.

7. The induction cooking device according to claim 6, wherein the temperature sensor comprises an indirect temperature sensor.

8. A method for operating an induction cooking device with an induction coil and a driving circuit for heating a cooking vessel, the method comprising: operating the induction coil with the driving circuit, and dynamically adapting the distance between the induction coil and a cooking surface based on a temperature of the induction coil and/or at least one component of the driving circuit, wherein the distance is increased with increasing temperature of the induction coil and/or the at least one component of the driving circuit.

9. The method according to claim 8, wherein dynamically adapting the distance between the induction coil and the cooking surface comprises moving a movable carrying structure that carries the induction coil with a number of actuators.

10. The method according to claim 9, wherein moving the movable carrying structure is performed with a flexible body and a phase change material provided in the flexible body.

11. The method according to claim 10, wherein the phase change material comprises a salt hydrate and/or a paraffin and/or a bio-based phase change material.

12. The method according to claim 9, wherein moving the movable carrying structure is performed with electromechanical actuation elements and respective driving circuits.

13. The method according to claim 12, comprising measuring the temperature of the induction coil and/or the at least one component of the driving circuit, wherein moving comprises controlling the electromechanical actuation elements based on the measured temperature.

14. The method according to claim 13, wherein the temperature is measured with an indirect temperature sensor.

15. The method according to claim 14, wherein the indirect temperature sensor comprises a current sensor, and wherein the carrying structure is lowered if a predefined current threshold value is exceeded by a current measured by the current sensor, and wherein if the measured current is lower than the current threshold value, the carrying structure is positioned in a position nearest to the cooking surface.

16. The induction cooking device according to claim 6, wherein the temperature sensor comprises a current sensor.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0046] For a more complete understanding of the present disclosure and advantages thereof, reference is now made to the following description taken in conjunction with the accompanying drawings. The disclosure is explained in more detail below using exemplary embodiments which are specified in the schematic figures of the drawings, in which:

[0047] FIG. 1 shows a block diagram of an embodiment of an induction cooking device according to the present disclosure;

[0048] FIG. 2 shows a block diagram of another embodiment of an induction cooking device according to the present disclosure;

[0049] FIG. 3 shows a block diagram of another embodiment of an induction cooking device according to the present disclosure; and

[0050] FIG. 4 shows a flow diagram of an embodiment of a method according to the present disclosure.

[0051] In the figures like reference signs denote like elements unless stated otherwise.

DETAILED DESCRIPTION

[0052] FIG. 1 shows a block diagram of an induction cooking device 100. The induction cooking device 100 comprises a cooking surface 101 with a cooking hob 106. On the cooking hob 106 a cooking vessel 150 may be provided for heating cooking goods. Further, an induction coil 102 is provided below the cooking surface 101. The induction coil 102 is electrically coupled to a driving circuit 103. In addition, in the induction cooking device 100 coil mount 105 is arranged under the cooking hob 106 and carries the induction coil 102.

[0053] During operation of the induction cooking device 100, the coil mount 105 dynamically adapts the distance between the induction coil 102 and the cooking surface 101 based on a temperature of the induction coil 102 and/or at least a component of the driving circuit 103, e.g., switching element 104. If the temperature of the induction coil 102 and/or at least a component of the driving circuit 103 increases, e.g., to more than a predefined threshold, the coil mount 105 increases the distance between the induction coil 102 and the cooking surface 101, and vice versa.

[0054] This means, that if a specific temperature in the driving circuit 103 or the induction coil 102 is exceeded, the induction coil 102 will be lowered. It is understood, that the coil mount 105 may be configured such that lowering starts at a temperature that is not achieved under normal operating conditions, but only with cooking vessels that comprise inferior ferromagnetic properties. This temperature may, e.g., be determined experimentally during development or design of the induction cooking device 100.

[0055] FIG. 2 shows a block diagram of another induction cooking device 200. The induction cooking device 200 is based on the induction cooking device 100. Therefore, the induction cooking device 200 comprises a cooking surface 201 with a cooking hob 206. On the cooking hob 206 a cooking vessel 250 is provided for heating cooking goods. Further, an induction coil 202 is provided below the cooking surface 201. The induction coil 202 is electrically coupled to a driving circuit 203. A schematic switching element 204 is shown in the driving circuit 203. In the induction cooking device 200 the coil mount is not explicitly shown. Instead a carrying structure 210 and actuators comprising flexible bodies 211, 212 filled with phase change materials 213, 214 are provided.

[0056] The carrying structure 210 carries the induction coil 202 and is mechanically coupled to the flexible bodies 211, 212, which are positioned under the carrying structure 210. As already explained above, the phase change materials 213, 214 may become soft or liquid when they are heated up to a specific temperature. If the phase change material 213, 214 becomes soft, the flexible bodies 211, 212 may be compressed by the weight of the carrying structure 210 and the induction coil 202. Alternatively, the phase change materials 213, 214 may expand when liquifying and may therefore expand the flexible bodies 211, 212 sideways, therefore contracting them vertically. To this end, the top and bottom of the flexible bodies 211, 212 may be non-flexible.

[0057] The embodiment of FIG. 2 therefore provides a very simple arrangement without the requirement of a dedicated electrical control.

[0058] FIG. 3 shows a block diagram of another induction cooking device 300. The induction cooking device 300 is based on the induction cooking device 200. Therefore, the induction cooking device 300 comprises a cooking surface 301 with a cooking hob 306. On the cooking hob 306 a cooking vessel 350 is provided for heating cooking goods. Further, an induction coil 302 is provided below the cooking surface 301. The induction coil 302 is electrically coupled to a driving circuit 303. A schematic switching element 304 is shown in the driving circuit 303. In the induction cooking device 300 the coil mount is not explicitly shown. Instead of the flexible bodies 211, 212, the induction cooking device 300 comprises an electromechanical actuation element 315 that is provided under the carrying structure 310. Further, in the driving circuit 303 a distance control unit 316 is provided. The distance control unit 316 is coupled to the electromechanical actuation element 315 to control the electromechanical actuation element 315. Further, a temperature sensor 317 is provided at the switching element 304 and coupled to the distance control unit 316, and a current sensor 318 is provided in the power line from the induction coil 302 to the driving circuit 303. The current sensor 318 is also coupled to the distance control unit 316. It is understood, that the current sensor 318 may be used as alternative to the temperature sensor 317 and that only one of the two sensors 317, 318 may be provided.

[0059] The distance control unit 316 controls the electromechanical actuation element 315 based either on a temperature measured by the temperature sensor 317 or based on a current measured by the current sensor 318, or both. If the temperature or the current or both exceed a predetermined threshold value, the distance control unit 316 may control the electromechanical actuation element 315 to lower the induction coil 302 with respect to the cooking surface 301.

[0060] The current through the switching element 304 and the induction coil 302 influences the temperature of the switching element 304 and the induction coil 302. The current sensor 318 in this embodiment may therefore be seen as an indirect temperature sensor.

[0061] For sake of clarity in the following description of the method-based FIG. 4 the reference signs used above in the description of apparatus-based FIGS. 1-3 will be maintained.

[0062] FIG. 4 shows a flow diagram of a method for operating an induction cooking device 100, 200, 300 with an induction coil 102, 202, 302 and a driving circuit 103, 203, 303 for heating a cooking vessel 150, 250, 350.

[0063] The method comprises operating S1 the induction coil 102, 202, 302 with the driving circuit 103, 203, 303, and dynamically adapting S2 the distance between the induction coil 102, 202, 302 and the cooking surface 101, 201, 301 based on a temperature of the induction coil 102, 202, 302 and/or the at least one component of the driving circuit 103, 203, 303, wherein the distance is increased with increasing temperature of the induction coil 102, 202, 302 and/or the at least one component of the driving circuit 103, 203, 303.

[0064] The step of adapting S2 may comprise moving a movable carrying structure 210, 310 that carries the induction coil 102, 202, 302 with a number of actuators.

[0065] Moving the movable carrying structure 210, 310 may be performed especially with two different options.

[0066] For example, a flexible body 211, 212 and a phase change material 213, 214 provided in the flexible body 211, 212 may be arranged such that when the phase change material 213, 214 heats up, the flexible body 211, 212 deforms and lowers the carrying structure 210, 310. The phase change material 213, 214 may comprise salt hydrates and/or paraffins and/or bio-based phase change materials 213, 214.

[0067] As alternative, moving the movable carrying structure 210, 310 may be performed with electromechanical actuation elements 315 and respective driving circuits 103, 203, 303. To this end, the temperature of the induction coil 102, 202, 302 and/or the at least one component of the driving circuit 103, 203, 303 may be measured and moving may comprise controlling the electromechanical actuation elements 315 based on the measured temperature. The temperature may be measured with a dedicated temperature sensor or with an indirect temperature sensor 317. The indirect temperature sensor 317 may, e.g., comprise a current sensor 318. The carrying structure 210, 310 may be lowered if a predefined current threshold value is exceeded by a current measured by the current sensor 318. If the measured current is lower than the current threshold value, the carrying structure 210, 310 may, e.g., be positioned in the position nearest to the cooking surface 101, 201, 301. As alternative, a linear relationship may be established between temperature/current and the distance.

[0068] Although specific embodiments have been illustrated and described herein, it will be appreciated by those of ordinary skill in the art that a variety of alternate and/or equivalent implementations exist. It should be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration in any way. Rather, the foregoing summary and detailed description will provide those skilled in the art with a convenient road map for implementing at least one exemplary embodiment, it being understood that various changes may be made in the function and arrangement of elements described in an exemplary embodiment without departing from the scope as set forth in the appended claims and their legal equivalents. Generally, this application is intended to cover any adaptations or variations of the specific embodiments discussed herein.

[0069] The present disclosure provides an induction cooking device 100, 200, 300 for heating a cooking vessel 150, 250, 350, the induction cooking device 100, 200, 300 comprising a cooking surface 101, 201, 301 comprising a cooking hob 106, an induction coil 102, 202, 302, a driving circuit 103, 203, 303 electrically coupled to the induction coil 102, 202, 302, and a coil mount 105 that is arranged under cooking hob 106, wherein the induction coil 102, 202, 302 is arranged on the coil mount 105 and wherein the coil mount 105 is configured to dynamically adapt the distance between the induction coil 102, 202, 302 and the cooking surface 101, 201, 301 based on a temperature of the induction coil 102, 202, 302 and/or at least a component of the driving circuit 103, 203, 303, wherein the coil mount 105 is configured to increase the distance between the induction coil 102, 202, 302 and the cooking surface 101, 201, 301 with increasing temperature of the induction coil 102, 202, 302 and/or the at least one component of the driving circuit 103, 203, 303.

LIST OF REFERENCE SIGNS

[0070] 100, 200, 300 induction cooking device [0071] 101, 201, 301 cooking surface [0072] 102, 202, 302 induction coil [0073] 103, 203, 303 driving circuit [0074] 104, 204, 205 switching element [0075] 105 coil mount [0076] 106 cooking hob [0077] 210, 310 carrying structure [0078] 211, 212 flexible body [0079] 213, 214 phase change material [0080] 315 electromechanical actuation element [0081] 316 distance control unit [0082] 317 temperature sensor [0083] 318 current sensor [0084] S1, S2 method steps [0085] 150, 250, 350 cooking vessel