Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
  • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
  • G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B6/00—Heating by electric, magnetic or electromagnetic fields
  • H05B6/02—Induction heating
  • H05B6/06—Control, e.g. of temperature, of power
  • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B6/00—Heating by electric, magnetic or electromagnetic fields
  • H05B6/02—Induction heating
  • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
  • H05B6/12—Cooking devices
  • H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
  • H05B6/1227—Cooking devices induction cooking plates or the like and devices to be used in combination with them for wok pans and wok pans supports for induction cooking plates
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
  • G01K2207/00—Application of thermometers in household appliances
  • G01K2207/02—Application of thermometers in household appliances for measuring food temperature
  • G01K2207/06—Application of thermometers in household appliances for measuring food temperature for preparation purposes
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
  • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Definitions

• the invention relates to a device for measuring the temperature of an induction heating device, in particular a so-called wok hob as electric cooking appliance, and a method for measuring temperature with such a device.
• Inductive hobs for heating a wok as a cookware are known for example from DE 10336325 A1.
• the advantage of inductive heating is, among other things, the very rapid heating.
• the inductive energy transfer ensures efficient energy transfer.
• the invention has for its object to provide an aforementioned device and a corresponding method with which disadvantages of the prior art can be avoided and in particular a temperature measurement of both the recording and the cookware can be done as well as possible.
• an induction coil of the induction heating device adapted to its course, is provided below the receptacle, which forms a downwardly curved and advantageously closed surface.
• a temperature sensor is disposed in the immediate vicinity of the receptacle without a portion of the induction heating device between the temperature sensor and the receptacle. This means that a direct effect between temperature sensor on the one hand and recording on the other hand is guaranteed. Neither the induction heater nor other parts are in between, which could complicate or distort a temperature measurement. Details will be explained below.
• the temperature sensor is arranged outside the central region of the receptacle or the induction heating device.
• the device may essentially be the induction heating device with the extension around the temperature sensor.
• it may consist essentially only of the temperature sensor, possibly even from a fixture on the receptacle or on the induction heater.
• the temperature sensor can either be arranged outside the induction heating device or induction coil or next to it or at its edge. Here it is easily possible that it is provided directly or only a short distance to the recording. Alternatively, it may be arranged in a recess or opening in the induction heating device. This is especially advantageous when the induction heating or induction coil has a flat carrier on which sit the coil turns.
• a particularly good or accurate temperature measurement, even with a small time delay, can be obtained if the temperature sensor has only a small distance to the recording.
• Particularly advantageous he even lies directly on the recording.
• it can be attached to the recording, for example, glued.
• the temperature sensor can be supported or attached to the induction coil or an aforementioned coil support.
• the temperature sensor can for example be clipped or screwed to the receptacle.
• the temperature sensor is arranged not only outside the central region of the induction heater, but approximately in the outer third of the recording. Preferably, it is even arranged in the outer fifth to tenth, so relatively close to the edge.
• the wall of the cookware very close to the recording with the aforementioned advantages for a good and accurate temperature measurement.
• the temperature sensor can be arranged in the region of the induction coil such that it is completely surrounded by the induction coil, so to speak. This ensures that the temperature sensor is provided at a location that experiences a relatively strong and areal surrounding heating by the induction coil.
• the temperature sensor may be provided outside the induction coil. But then he should be provided relatively close to its edge, in particular as directly as possible. This has the advantage that the induction coil can be constructed without possibly changing its course by the temperature sensor located between two turns.
• an aforementioned coil carrier is similar to that of the recording, so it is preferably also curved or shaped like a partial ball. It may consist of an insulating material, such as temperature-resistant plastic.
• the bobbin advantageously extends between the induction coil and recording.
• a measurement of the temperature of the recording can be provided, in particular by a sensor in the best possible heat-conducting connection.
• a temperature sensor may operate with an optical scan, in particular an IR sensor or a pyrometer.
• Such temperature sensors are known, for example, from EP 690 659 A1 or DE 102004033454 A1.
• they can optically detect the temperature of the cookware through the correspondingly permeable receptacle, similar to what is known in the case of glass-ceramic cooking hobs in planar design.
• they detect the temperature at the recording are known, for example, from EP 690 659 A1 or DE 102004033454 A1.
• the receptacle is advantageously a substantially closed surface, particularly advantageously of glass ceramic. From a predominantly flat surface, there is a seamless transition into the part-spherical depression of the receptacle.
• the receptacle is designed in such a way that its diameter is slightly larger than its depth at the lowest point, so that the receptacle is thus somewhat smaller than a hemisphere.
• the invention also includes an induction heating device as explained above. This is in particular when attached to the induction heater temperature sensor, a structural unit that can be attached to the recording. Furthermore, the invention comprises an electric cooker, in particular as a so-called wok hob, either with the device mentioned above or the aforementioned induction heating.
• the calculation of the temperature for the cookware can be done so advantageously for a period of 5 to 10 minutes. After this period it is assumed that the temperature of the recording corresponds to that of the cookware. This temperature can then be further processed as known from the prior art in a control of the induction heating device or the electric cooking appliance.
• 1 is a side view of an electric cooking appliance according to the invention with induction heating and temperature sensor on the outer edge
• 2 is an enlarged view of the arrangement of the temperature sensor on the recording
• Fig. 3 shows a modification of Fig. 2 with the temperature sensor on the bobbin and
• Fig. 4 is a diagram of different temperatures over time for determining the temperature of the cookware from the temperature at the temperature sensor.
• an electric hob 11 is shown in the lateral section, which operates with induction heating. It has a glass ceramic plate 12 with a receptacle 13 in a conventional manner.
• the substantially planar glass-ceramic plate 12 merges in a transitional region 14 into the partially spherical, downwardly curved receptacle 13. Details on the exact configuration of glass ceramic plate 12 and receptacle 13 are known in the art.
• the receptacle 13 has the diameter D.
• the induction heater 16 Under the receptacle 13 is an induction heater 16 for inductive heating.
• the induction heater 16 has the induction coil 17. This consists of coil windings 18 which are spirally applied to a bobbin 20 in the form of the receptacle 13.
• This structure is known to the person skilled in the art, for example, from the aforementioned DE 10336325 A1.
• the temperature sensor 22 is mechanically supported on the edge of the bobbin 20 in a manner not shown mechanically. At the same time it is almost at the bottom of the receptacle 13 and has only a very small distance to it. In particular, if it is a resistance temperature sensor, it can also be a heat-conducting Have connection to the bottom of the receptacle 13, for example, from thermal grease.
• the attachment of the temperature sensor 22 at the edge of the bobbin 20 can be effected for example by the fact that the slightly raised upwards upper edge of the bobbin 20 has a corresponding recess in which the temperature sensor 22 is held, for example glued.
• the temperature sensor 22 and the induction coil 17 are connected to a controller 24, which in particular evaluates the temperature sensor and controls the coil or its application of power.
• a cookware 26 Inserted into the receptacle 13 is a cookware 26 in the form of a wok. It can be seen that the cookware 26 rests in the transition region 14 on the glass ceramic. The distance between the outer wall of the cookware and the receptacle 13 and thus also the induction coil 17 becomes larger towards the lowest point of the cookware. Although this distance still allows inductive heating, it makes a temperature measurement there, in particular with a resistance temperature sensor on the outside of the receptacle 13, difficult or inaccurate.
• a further embodiment of the invention is shown in which a temperature sensor 122 is also attached to a bobbin 120.
• the coil support 120 With an otherwise identical glass ceramic plate 112 and receptacle 113, the coil support 120 has a recess 121 near its upper left edge. Above the recess 121, a temperature sensor 122 is arranged, being fastened by holding clips 123. By forming the retaining clips 123, the temperature sensor 122 can be both easily assembled and easily disassembled, for example for repair or service.
• the temperature sensor 122 For example, as the above-mentioned IR sensor or as a pyrometer through the recess 122 through very well the temperature of the receptacle 113 or even therethrough, the temperature of the cookware 126 directly detect.
• the recess 121 either with thermally conductive paste or the like. be filled or with another part that transmits the heat very well.
• Fig. 2 is still a above the temperature sensor 122 extending, shown in dashed lines coil winding 118 'is shown.
• the temperature sensor does not necessarily have to be outside the induction coil or the coil windings, but can be directly in the inductively heated area, so to speak.
• the temperature sensor can also be mounted somewhat more downwards or towards the central region from its position which is relatively high or low in FIGS. 1 and 2. In the positions shown here it is approximately in the outermost 10% to 15% of the recording or its diameter D.
• the coil support 220 in a modification to FIG. 2, extends significantly further down at least in the region of a temperature sensor 222 or does not extend so far upwards.
• the temperature sensor 222 is attached directly to the underside of the receptacle 213, in particular glued to a corresponding temperature-resistant adhesive.
• the attachment of the temperature sensor 222 is independent of the induction coil 217 or the carrier 220.
• the temperature sensor 222 is directly against the receptacle 213 and is advantageously designed as a resistance temperature sensor. Its location is still sufficiently close to the area of the cooking zone heated by the induction coil 217. harness 226, so that the desired temperature detection on the receptacle 213 can be made.
• FIG. 4 An inventive method for determining the temperature T K of the cookware 26 by the temperature sensor 22 is shown in Fig. 4.
• the temperature T s is detected.
• the temperature T K is calculated by evaluating the slew rate of Ts and evaluating the differential fraction. This results in the calculated temperature T R. It can be clearly seen in FIG. 4 that this temperature T R is very close to the cookware temperature T K and can thus be determined well and reliably from T s .
• the timing in the diagram of FIG. 4 extends over a few minutes, for example 5 to 10 minutes. After a long time, the difference between the temperatures becomes smaller and closer to each other. For this purpose, the controller 24 calculates the temperature T R via a PD algorithm.

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• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• General Physics & Mathematics (AREA)
• Cookers (AREA)
• Induction Heating Cooking Devices (AREA)
• Radiation Pyrometers (AREA)
• Measuring Temperature Or Quantity Of Heat (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38520611

Family Applications (1)

Country Status (5)

Families Citing this family (19)

Citations (2)

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• 2006
  • 2006-04-28 DE DE102006021029A patent/DE102006021029A1/de not_active Withdrawn
• 2007
  • 2007-04-24 JP JP2009506962A patent/JP2009535608A/ja active Pending
  • 2007-04-24 WO PCT/EP2007/003581 patent/WO2007124891A1/de active Application Filing
  • 2007-04-24 CN CN2007800149955A patent/CN101432608B/zh not_active Expired - Fee Related
  • 2007-04-24 EP EP07724511A patent/EP2013595A1/de not_active Ceased

Patent Citations (2)

Non-Patent Citations (1)

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