DE102012210851A1 - Household induction cooking appliance, has infrared sensor for detection of infrared light of cookware placed on hob plate, where IR sensor is thermally connected with cooling body over circuit board and located on circuit board - Google Patents

Abstract

The appliance (11) has an infrared (IR) sensor (32) for detection of an IR light of a cookware (12) placed on a hob plate (15). The IR sensor is thermally connected with a cooling body over a circuit board. The IR sensor is located on the circuit board and forms IR sensor modules with the circuit board. The cooling body is provided for a power switch e.g. bipolar transistor, of the appliance. The IR sensor is arranged on a top side of the cooling body turned towards the hob plate and in a recess formed by return of a cooling fin.

Description

The invention relates to an induction cooking appliance, comprising at least one arranged below a cooktop panel infrared light (IR) sensor for detecting infrared light of a remote on the cooktop plate cookware.

For example, for hobs with cooking zones that are operated with a resistance heating element, it is DE 10 2004 015 255 A1 known to laterally sense a temperature of a side wall of a cooking pot by means of a top side protruding from the hob, one of the cooking zones permanently assigned IR sensor.

For example DE 10 2006 026 907 A1 An induction hob with a sensor device having a first sensor is known, which is capable of detecting measured values for determining a temperature of a defined preparation zone (cooking zone) on which a preparation container (cookware) can be placed for receiving a preparation, and with an IR sensor for the detection of heat radiation of the preparation zone and a bottom of the cookware, and an evaluation unit, which is electrically connected to the sensor and the IR sensor and with which information transmitted by the sensors, the temperature of the soil can be determined, wherein the two sensors are arranged such that their local detection areas at least partially overlapping, in particular substantially completely overlapping, are arranged. The sensors are arranged on a central recessed portion of a respective inductor, wherein each preparation zone is associated with a corresponding inductor.

As an IR sensor for an induction hob, an IR sensor element is known, which is preceded by a lens. The lens serves to focus the emanating from the bottom of the cookware IR radiation on the IR sensor element. The IR sensor is mounted on a front side of a board and directed vertically forward or upward. With its rear side, the board sits on a motherboard of the induction hob.

It is the object of the present invention, at least partially overcome the disadvantages of the prior art and in particular to provide an induction cooking appliance, which allows a particularly inexpensive realizable and / or accurate temperature measurement of cookware by IR radiation measurement.

This object is achieved according to the features of the independent claims. Preferred embodiments are in particular the dependent claims.

This object is achieved by an induction cooking appliance or induction hob, comprising at least one arranged below a cooktop IR sensor for detecting infrared light of a remote on the cooktop plate cookware, wherein the IR sensor is thermally connected to a heat sink. Unlike a construction in which the IR sensor is disposed substantially directly (i.e., not via a dedicated heat sink) on the electronic board of the induction cooker, heat from the IR sensor can now be dissipated particularly effectively. Consequently, the IR sensor does not heat up significantly or only minimally. In addition, temporal and / or local temperature gradients can thus be avoided or at least strongly suppressed at the IR sensor. This in turn allows a stable IR measurement and correspondingly high measurement accuracy. In addition, the IR sensor can now be brought closer to the hotplate heated during operation, which increases an evaluable IR light intensity and thus a measurement accuracy.

The fact that the IR sensor is thermally connected to a heat sink can mean, in particular, that heat of the IR sensor can be dissipated significantly by means of the heat sink, or heat of the IR sensor can be transmitted to the heat sink to a considerable extent. The heat sink is therefore provided in particular as a dedicated heat sink for the IR sensor.

The induction cooking appliance can have at least one inductor, in particular a plurality of inductors, which are arranged below the hob plate. A plurality of inductors may each be associated with a cooking zone, or a cookware may be freely positionable on the hob plate, in particular if the at least one inductor is designed as a field (comparatively smaller) of inductors.

On the underside of the inductor, a shield plate may be arranged to shield the (electro) magnetic field generated by the inductor. On the underside of the shielding plate may be arranged a device electronics. The device electronics may be particularly electronic switches, e.g. Semiconductor power switch, for switching on and off of the respective inductor or inductor group flowing through the excitation current. The semiconductor power switches may be e.g. be designed as IGBTs, bipolar transistors, field effect transistors, etc.

The IR sensor may in particular have an IR reflector, which is connected upstream of an IR sensor element.

It is an embodiment that at least the IR sensor (and optionally additionally at least one electronic component such as a resistor, a coil, a capacitor, an integrated circuit, etc.) is arranged on a circuit board with which the board forms an IR sensor module and connected via the board to the heat sink. Thus, in addition, an electronic circuit constructed by the at least one electronic component can be cooled. This improves reliability. In the following, the IR sensor module and the IR sensor can be used interchangeably, if there is nothing to prevent this from the context. In addition, mounting the board is easier than on a flat surface.

It is still an embodiment that the heat sink is a heat sink for at least one further electronic component of the induction cooking appliance, in particular circuit breaker. Thus, the number of heat sinks can be limited, which simplifies installation and reduces costs.

It is a further embodiment that the IR sensor is arranged on one of the hob plate facing top of the heat sink. As a result, the advantage is achieved that the IR sensor can be positioned effectively coolably close to the cooktop panel, which allows a high accuracy of measurement. In addition, the IR sensor or the IR sensor module alone can be at least partially shielded due to such positioning relative to the radiant energy emitted by the cooking appliance electronics on the electronic board.

It is yet another embodiment that the cooling body has a plurality of, in particular mutually parallel, cooling fins and the IR sensor is arranged on at least one cooling fin. This allows a particularly simple installation, in particular support on the heat sink. The cooling ribs can in principle be arranged on each side, in particular on the upper side or on the upper side and underside of the cooling body. The cooling fins are in particular continuous cooling fins, which allows effective heat dissipation and easy forced ventilation. The cooling fins may be in particular straight.

It is also an embodiment that at least one electrical supply line is laid to the IR sensor in a gap between two cooling fins, in particular of cooling fins on which the IR sensor is arranged. The cooling fins provide the at least one electrical lead, e.g. Test lead, effectively shielded from interference fields, which further improves measurement accuracy in a particularly simple and cost-effective manner. It can supply lines laid in a same gap between two cooling fins, or in different columns.

It is also an embodiment that the IR sensor is arranged in a receptacle formed by a recess of at least one cooling fin and at least the cooling fins carrying the IR sensor or whose gap can be forced through with air. As a result, at least the part of the IR sensor or the IR sensor module which is sunk into the cooling ribs is blown through the (cooling) air and consequently additionally cooled. In addition, the air impinging on the IR sensor or the IR sensor module is deflected along the part projecting out of the cooling ribs, so that it is also cooled. In an IR sensor arranged on an upper side of the heat sink, etc., an air flow directed upwardly is thus also generated, which cools the components arranged on or in front of the IR sensor, etc. Consequently, the IR sensor or the IR sensor module can be brought closer to the hob plate while maintaining a high accuracy of measurement. In addition, at least the part of the IR sensor or the IR sensor module which is sunk into the cooling fins is even better shielded from electromagnetic fields by the cooling fins (made of metal) surrounding it laterally. The part of the IR sensor or of the IR sensor module which is sunk into the cooling fins can in particular comprise the at least one electronic component and / or the IR sensor element.

It is also an embodiment that at least some of the positive-flow cooling fins are covered by a cover plate, e.g. top side arranged cooling fins. This allows a sufficiently strong air flow over the entire length of these cooling fins and thus a particularly uniform and strong cooling effect. The cover plate is in particular electrically conductive, in particular metallic, configured (for example made of aluminum), so that the region of the heat sink covered by it is also shielded from the top against interference fields.

It is still an embodiment that the IR sensor is essentially free (that is not laterally sealed). This avoids obstruction of airflow along the IR sensor.

It is also an embodiment that the IR sensor, in particular an IR reflector of the sensor, is passed through gaps with at least one cover. Thus, the IR sensor can be brought very close to the cooking plate cover. The cover can be at least one Cover for thermal insulation (eg mica or insulating board) include. Additionally or alternatively, the cover may comprise at least one shield against an electromagnetic field (eg a shielding plate and / or a cover of a heat sink).

It is a development that the IR sensor or its measuring spot is arranged eccentrically with respect to the inductor, since such a falsification can be avoided by a present in the middle of a bottom of the cookware cambering, printing or embossing.

The induction cooking appliance is in particular a household appliance.

In the following figures, the invention will be described schematically with reference to exemplary embodiments. In this case, the same or equivalent elements may be provided with the same reference numerals for clarity.

1 shows a sectional side view of a section of an induction cooking appliance according to a first embodiment with an attached cookware;

2 shows a sectional side view of an IR sensor of the induction cooking apparatus according to the first embodiment;

3 shows an induction cooking apparatus according to a second embodiment comprising a equipped with the IR sensor heat sink;

4 shows the equipped with the IR sensor heat sink in plan view;

5 shows a sectional side view of a section of an induction cooking appliance according to a third embodiment with an attached cookware; and

6 shows a sectional side view of optical components of an induction cooking appliance according to a third embodiment with an attached cookware.

1 shows a section of an induction cooker according to the invention 11 with a cookware placed on top 12 , wherein the induction cooker 11 and the cookware 12 are shown spaced apart only for clarity.

The induction cooker 11 has a housing bottom 13 a housing 14 on which top of a hob plate 15 is covered. The hob plate 15 may for example consist of glass, including toughened glass or glass ceramic. Immediately below the hob plate 15 there is a thin plate 16 made of mica, eg for temperature shielding from under the plate 16 located components.

At the bottom of the plate 16 is an annular inductor 17 attached, which is a carrier housing 18 , For example, made of plastic, which has a field guide 19 , Eg ferrite, and a coil 20 for generating an (electro) magnetic alternating field at an associated cooking zone. The alternating field has a frequency of about 25 to 30 kHz or higher. Higher values can occur especially with harmonics. Due to the magnetic alternating field can be in a soil 21 of cooking utensils placed on the cooking zone 12 An induction current can be generated which covers the ground 21 for the preparation of in the cookware 12 warmed up food.

Below the inductor 17 there is a metallic shielding plate 22 , eg made of aluminum. The shielding plate 22 shields an electronics board equipped with the device electronics 23 at least partially against the alternating electric field. The electronic board 23 lies with its unassembled back on the caseback 13 on.

In the area of a central hole 24 of the annular inductor 17 Show both the plate 16 as well as the shielding plate 22 concentric holes 25 respectively. 26 on. A contact temperature sensor in the form of an NTC sensor 27 is through the hole 25 in the plate 16 guided and at the bottom of the hob plate 15 attached to sense their temperature. Electric lines 28 of the NTC sensor 27 be through the hole 24 of the inductor 17 and the hole 26 of the shielding plate 22 led out.

Also in the area of the inductor 17 (and thus off-center) is a vertically continuous recess 29 , and in the plate 16 and in the shielding plate 22 in each case a concentric recess 30 respectively. 31 , Below the recess 29 of the inductor 17 There is an infrared (IR) sensor 32 which is in the recess 31 of the shielding plate 22 is inserted and whose field of view through the recesses 29 and 30 on the hob plate 15 is directed. The hob plate 15 is for at least a part of the IR measurement spectrum of the IR sensor 32 permeable, leaving the IR sensor 32 from a measuring spot M at the bottom 21 Outgoing IR radiation IR can sense and from this a temperature of the soil 21 is derivable.

This temperature can be used in particular to control the temperature of the cookware 12 or the temperature of a content of the cookware 12 The temperature may be used to detect dangerous situations (eg overheating of a cookware filled with oil or fat) 12 ), for example, to avoid a fire hazard and to turn off, for example, a power supply when the contents of the cookware overheats.

A preferably transmissive region of the IR measurement spectrum of the IR sensor 32 is between one and five microns, especially between one and three microns. By means of the through the NTC sensor 27 sensed temperature of the hob plate 15 may be a measurement corruption of the IR measurement of the soil 21 due to the temperature of the hob plate 15 Getting corrected.

The eccentric arrangement of the IR sensor 31 has the advantage that sometimes at a middle of the ground 21 located stamps, color marks, etc. are not detected and therefore can not distort a temperature measurement.

The electronic board 23 is from the shielding plate 22 spaced so that a space forms between them which acts as an air channel 33 serves. At the air duct 33 can eg a fan on the side 34 be present, which in the air duct 3 generates a stream of air K. The airflow can both the electronics board 23 Cool directly as well as waste heat from the floor or the inductor 17 over the shielding plate 22 dissipate.

The induction cooker 11 in particular has several cooking zones with a respective associated inductor 17 , IR sensor 32 and NTC sensor 27 etc. on.

2 shows a sectional view in side view of the IR sensor 32 in higher accuracy. The IR sensor 32 has an IR diode 41 on which one in a metallic housing 42 housed IR sensor element 43 having. At an upper side of the housing 42 is located on, possibly designed as a filter window 44 , by the IR radiation on the IR sensor element 43 can fall. On the reverse, the IR diode 41 electrical connections 45 on. The housing 42 is designed as a TO ("transistor single outline") - housing.

On the case 42 is an IR reflector 46 placed. The IR reflector 46 one has the IR diode 41 laterally surrounding outer can or sleeve 47 on. The sleeve 47 is tubular and made of electrically good conductive material, such as copper or aluminum. The sleeve 47 For example, it can be made deep-drawn or rotated.

At its front edge 48 sets a cup-shaped inner carrier 49 made of plastic, that of the sleeve 47 is surrounded and a front light exit opening E and a rear opening ("neck hole") 51 having. The front, further opening 50 is located in the region of a front open end of the sleeve 47 , which serves as a light passage opening E. The neck hole 51 is through the IR diode 41 closed, in particular covered. In particular, likes the neck hole 51 a tubular neck 52 connect in the rearward direction, which on the housing 42 attachable, which simplifies assembly. The light transmission opening E can be open or through an IR-permeable cover 50 to be introverted.

The carrier 49 indicates on its inside 53 an IR-reflecting, in particular reflecting, reflection layer 54 and likes on its outside 55 be at least partially IR-mirrored. The reflection layer 54 is preferably a (thin) aluminum layer, which is easy and inexpensive to apply and also high reflectance (often 96% or more) allows.

The use of an IR reflector 46 or a reflection layer 54 opposite to a lens made of plastic as Strahlenbündelndem or focusing, the IR diode 41 upstream element has, inter alia, the advantage that at the IR reflector 46 In contrast to the lens as a transmitted light element no or a much lower attenuation of the IR radiation occurs. With respect to a lens, attenuation could be countered with a silicon or germanium lens, with germanium being expensive and silicon disadvantageously exhibiting temperature dependence of its emission and reflection. In addition, in silicon, a dependence of the refractive index of the temperature can occur. Another problem is the usually present coating (surface treatment / coating) of the silicon. Coatings are applied to optimize the reflection behavior and / or to define a wavelength range in which the lens has a particularly high transmission. Thus, a filter function can be achieved. However, these coatings generally tolerate only low temperatures. Because in the area of the inductor 17 Temperatures of up to more than 150 ° C may occur, is therefore to be expected in a silicon lens with disturbances in the transmission and / or destruction of the coating. The optical properties of IR reflectors 46 On the other hand, in general, they do not depend on the temperature of the reflective layer 54 from.

The inside 53 of the carrier 49 and thus also the reflection layer 54 have here specifically a form of a so-called. "Winston Cone" on. The Winston Cone has a one Paraboloid paraboloid similar shape and can in particular incident, divergent radiation in a point in the neck hole 51 reflect. A Winston cone can also be considered as a rotationally symmetric CPC (compound parabolic concentrator) concentrator. In particular, the Winston cone has the advantage of high efficiency and a high radiance at the point in the region of the neck in comparison with, for example, a simple paraboloid or ellipsoid 51 on. For example, the Winston Cone may be shaped to have this point on the window 44 is or, preferably, on the IR sensor element 43 located. This achieves a particularly high measuring sensitivity. The inside 53 of the carrier 49 here has an opening angle between about 10 ° and about 20 °.

Part of the IR reflector 46 sticking out through the hole 31 in the shielding plate 22 and is therefore the strong (electro) magnetic alternating field of the overlying coil 20 exposed to high field strength. Also, the alternating field basically through the hole 31 penetrate. To avoid interference by this alternating field, there is the sleeve 47 made of electrically good conductive (full) material and can therefore serve as a shield against the alternating field. In particular, an induction of interference voltages in existing conductor loops, which would otherwise disturb measurement signals and thus reduce measurement accuracy, can be avoided. Also, this can cause generation of significant eddy currents in the reflective layer 54 be avoided, which eddy currents otherwise the reflection layer 54 damage or even destroy it (eg by being heated, by electromigration or by a combination of both effects).

The IR sensor 32 is here standing vertically on a circuit board 56 arranged, which together, possibly with on the board 56 located electronic components 71 (please refer 4 ) an IR sensor module 32 . 56 form. In front of the IR sensor 32 If necessary, an optical filter and / or a diaphragm can be arranged (o.Fig.).

3 shows an induction cooker 61 according to a second embodiment, the one with the IR sensor 32 equipped heatsink 62 having. 4 shows that with the IR sensor 32 equipped heatsink 62 in plan view.

The induction cooker 61 is different from the induction cooker 11 in that the IR sensor 32 or the IR sensor module 32 . 56 on the heat sink 62 is appropriate. This results in a particularly precise sensing of the IR radiation and consequently temperature measurement at the bottom 21 of the cookware 12 allows. The heat sink 62 For example, it is made of aluminum.

Although the heat sink basically also on only one for cooling the IR sensor 32 or the IR sensor module 32 . 56 provided heat sink may be applied, is the heat sink 62 here a combined heat sink 62 which also for cooling at least one electronic component of the electronic board 23 can be used. In the present case, the combined heat sink is used 62 for cooling electronic switches 63 , which eg the coils 20 turn the cooking zones on and off. The electronic switches 63 are here as power semiconductors, in particular IGBTs but also bipolar transistors or field effect transistors, etc., formed, and for cooling surface on a lateral, planar surface 64 of the heat sink 62 applied.

To enhance a cooling effect, the heat sink 62 at its the hob plate 15 facing top and on its serving for support underside cooling fins 65 on which by means of the fan 34 With air K are positively flowed along its longitudinal extent (ie in particular that the air K in a gap between two cooling fins 65 can flow).

On top of the heat sink 62 is in the cooling fins 65 a recording 66 introduced, for example milled, in which the IR sensor module 32 . 56 arranged or partially sunk. The IR sensor module 32 . 56 therefore lies with his board 56 on several cooling fins 65 on which in the field of recording 66 have a return. Alternatively, the cooling fins 65 in the field of recording 66 also be completely removed locally and the board 56 sit flat on the heat sink.

This arrangement provides the advantage that the IR sensor module 32 . 56 does not heat up significantly or only minimally due to its operation. There is also the IR sensor module 32 . 56 thermally stable, ie that it is in one of the operation of the induction cooking appliance 61 resulting heating heated only slowly and evenly and thus in particular on the IR sensor module 32 . 56 no significant temperature gradients occur.

In addition, the electronic components 71 , the IR sensor element 43 and connecting cables 69 of the IR sensor module 32 . 56 be safely shielded from all typically occurring electrical and / or magnetic fields. The shielding of the electronic components or IR sensor electronics improves their sensitivity. The shielding is through the air duct over the heat sink 62 optimized. This is especially true if this air duct is made of aluminum. The connecting cables 69 are in particular in the recesses or gaps between the cooling fins 65 relocated in particular to avoid the interference of interfering signals in the connection cables (EMC problems). In addition, such an arrangement is inexpensive feasible and easy to install.

To maintain an effective airflow also away from the blower 34 is the top of the heat sink 62 , as in 3 shown by serving as an air guide and as a further shield against electrical and / or magnetic fields cover plate 67 covered. The cover plate 67 can eg on the shield 22 attached, eg screwed or glued be. The cover plate 67 can be made of aluminum, for example.

Between the cover plate 67 and the shielding plate 22 can (at least) an intermediate layer 68 be present, which is a hole 70 to carry out the IR sensor 32 having. Also, the cover plate has a hole here. The liner 68 serves the thermal shielding between the shielding plate 22 and the cover plate 67 and may consist of mica or insulating cardboard, for example. It is preferred that the liner 68 the cover plate 67 completely covered, but at least in the area around the hole 70 to carry out the IR sensor 32 or from the sleeve 47 ,

The holes 70 . 31 in the liner 68 or in the shielding plate 22 (as well as in the cover plate 67 ) do not close close to the sleeve 47 but leave an associated annular gap. The sleeve 47 is thus free. Because of the heat sink 62 flowing air K through the IR sensor module 32 . 56 , especially the sleeve 47 , is prevented from a horizontal air flow, it will be on the sleeve 47 deflected upwards and flows, the sleeve 47 sweeping through the holes 70 . 31 high. This will cause the sleeve 47 or the IR reflector 46 flows of relatively cool air K with a relatively constant temperature and tempered so. In addition, by the around the sleeve 47 The air K flowing around it is also cooled or at least tempered by its immediate surroundings, which further reduces disturbances in the radiation measurement. By cooling the environment, especially the inductor 17 and the shielding plate 22 Also, the temperature stability of the IR sensor 32 further improved.

The IR sensor module 32 . 56 can in principle be attached as desired, for example in or on the heat sink 62 , on the shielding plate 22 etc.

5 shows a section in side view of a section of an induction cooker 81 according to a third embodiment with an attached cookware. In contrast to the induction cooker 11 is the IR sensor 32 (of which here only the cup-shaped inner carrier 49 shown) is not perpendicular to the cookware 12 aligned, but horizontal. To still IR radiation IR from the ground 21 of the cookware 12 to be able to receive is below the holes 29 to 31 an IR radiation reflecting deflecting mirror 82 arranged, which through the holes 29 to 31 passing IR radiation at least partially into the IR sensor 32 deflects. Basically, a distance between the IR sensor 32 and the deflecting mirror 82 be any size.

The induction cooker 81 has the advantage that the IR sensor module 32 . 56 already through the shielding 22 in front of the coil 20 generated field is safely shielded. For example, it is also possible in principle for the sleeve 47 be dispensed with or, for example, a plastic sleeve can be used. In addition, like one for the IR sensor module 32 . 56 required height to be lower. In addition, and a positioning flexibly selectable, for example, also laterally next to the inductor 17 , Especially at a position next to the inductor 17 becomes the IR sensor module 32 . 56 not so much warmed up, and a cooling of the sensor module 32 is structurally easier to implement.

6 shows a sectional view in side view optical components 92 . 93 . 41 . 56 an induction cooker 91 according to a third embodiment with an attached cookware 12 , In contrast to the induction cooker 81 is the deflection mirror 92 now even designed as a focusing element, so that on an IR reflector 46 at the IR diode 41 can be dispensed with. This may simplify assembly and reduce costs. This type of construction allows, among other things, a simple arrangement (at least) of a spectral filter 93 ,

The deflection mirror 92 is here designed as an ellipsoidal surface (in particular as a partial surface of an ellipsoid of revolution), so that from the bottom 21 outgoing IR radiation IR, which is from a virtual first focus above the ground 21 is directed to a second focal point F2 at the location of the IR sensor element 43 focused. An advantage of the focusing, in particular ellipsoid, deflecting mirror 92 lies in the fact that adjustment problems between otherwise independent (pure) deflecting mirror and reflector omitted.

To further reduce the height of the present here IR sensor module 41 . 56 is the IR sensor 41 not on a large side surface of the board 56 attached, but on the side of the board 56 , The entire IR sensor module 41 . 56 then fits much easier in the induction cooker 91 , Especially if working with deflecting mirrors.

The embodiments shown are highly accurate and relatively inexpensive to implement.

Of course, the present invention is not limited to the embodiments shown.

In particular, features of the various embodiments can also be combined, for example, an arrangement of the IR sensor module on a heat sink with each of the embodiments shown.

Furthermore, instead of a Winston Cones also a simple paraboloid or ellipsoidal reflection layer or reflector can be used. Also, instead of a Winston Cones, another optical concentrator may be used, eg, another CPC concentrator (such as a non-rotationally symmetric CPC concentrator), a compound elliptic concentrator (CEC) concentrator, or a compound hyperbolic (CHC) concentrator ") - concentrator. In particular, the CEC concentrator and the CHC concentrator can be used to concentrate light from a flat IR emitter within a short distance, but mostly not to a point but to a surface. This can be the case, for example, with a considerably extended IR sensor element 43 and / or be advantageous in a vertical installation with low height.

In principle, the IR sensor can be preceded by at least one optical element which is effective for IR light, e.g. at least one aperture, at least one filter, at least one beam-forming transmitted light element, at least one reflector, etc.

Also, an imaging, in particular focusing, deflection mirror may be used together with an IR reflector mounted directly on the IR sensor.

LIST OF REFERENCE NUMBERS

11

 Induction cooker

12

 Cookware

13

 caseback

14

 casing

15

 Hotplate

16

 plate

17

 inductor

18

 support housing

19

 field guide

20

 Kitchen sink

21

 Bottom of the cookware

22

 shield

23

 electronic board

24

 central hole of the annular inductor

25

 Hole of the plate

26

 Hole of the shielding plate

27

 NTC sensor

28

 Electric cable of the NTC sensor

29

 Recess of the inductor

30

 Recess in the plate

31

 Recess in the shielding plate

32

 IR sensor

33

 air duct

34

 Fan

41

 IR-diode

42

 Housing of the IR diode

43

 IR sensor element

44

 Window of the IR diode

45

 electrical connection of the IR diode

46

 IR reflector

47

 shell

48

 Edge of the sleeve

49

 carrier

50

 IR-transparent cover of the IR reflector

51

 neckhole

52

 Support

53

 Inside of the carrier

54

 reflective layer

55

 Outside of the vehicle

56

 circuit board

61

 Induction cooker

62

 heatsink

63

 electronic switch

64

 plane surface of the heat sink

65

 cooling fin

66

 admission

67

 cover

68

 liner

69

 connecting cable

70

 Hole in the liner

71

 electronic component

81

 Induction cooker

82

 deflecting

91

 Induction cooker

92

 deflecting

93

 spectral filter

e

 Light opening

F2

 focus

IR

 IR radiation

K

 air

M

 measuring spot

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102004015255 A1 [0002]
• DE 102006026907 A1 [0003]

Claims (10)

Induction cooker ( 61 ), comprising at least one below a cooking plate ( 15 ) arranged IR sensor ( 32 ) for detecting infrared light (IR) of a cooking field plate ( 15 ) remote cookware ( 12 ), characterized in that the IR sensor ( 32 ) with a heat sink ( 62 ) is thermally connected. Induction cooker ( 61 ) according to claim 1, characterized in that at least the IR sensor ( 32 ) on a board ( 56 ) is arranged with the board ( 56 ) an IR sensor module ( 32 . 56 ) and over the board ( 56 ) with the heat sink ( 62 ) connected is. Induction cooker ( 61 ) according to one of the preceding claims, characterized in that the heat sink ( 62 ) a heat sink ( 62 ) for at least one further electronic component of the induction cooking appliance ( 61 ), in particular circuit breakers ( 63 ). Induction cooker ( 61 ) according to one of the preceding claims, characterized in that the IR sensor ( 32 ) on one of the hob plate ( 15 ) facing the top of the heat sink ( 62 ) is arranged. Induction cooker ( 61 ) according to one of the preceding claims, characterized in that the heat sink ( 62 ), in particular mutually parallel, cooling fins ( 65 ) and the IR sensor ( 32 ) on at least one cooling fin ( 35 ) is arranged. Induction cooker ( 61 ) according to claim 5, characterized in that at least one electrical supply line to the IR sensor ( 32 ) in a gap between two cooling fins ( 65 ), in particular of cooling fins ( 35 ) on which the IR sensor ( 32 ) is arranged. Induction cooker ( 61 ) according to one of claims 5 or 6, characterized in that the IR sensor ( 32 ) in a by a return of at least one cooling rib ( 65 ) ( 66 ) and at least the IR sensor ( 62 ) carrying cooling fins ( 65 ) are positively flowed through with air (K). Induction cooker ( 61 ) according to claim 7, characterized in that at least some of the forced-flow cooling fins ( 65 ) by means of a, in particular metallic, cover plate ( 67 ) are covered. Induction cooker ( 61 ) according to one of claims 7 or 8, characterized in that the IR sensor ( 32 ) stands upright substantially free. Induction cooker ( 61 ) according to claim 9, characterized in that the IR sensor ( 32 ) cleaved by at least one cover ( 67 . 68 . 22 ) is passed.

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