DE102004033115A1 - A method for controlling the temperature of a cooker heating system has an inductive temperature variable coil heating element and control system monitoring the specific resonant frequency - Google Patents
A method for controlling the temperature of a cooker heating system has an inductive temperature variable coil heating element and control system monitoring the specific resonant frequency Download PDFInfo
- Publication number
- DE102004033115A1 DE102004033115A1 DE200410033115 DE102004033115A DE102004033115A1 DE 102004033115 A1 DE102004033115 A1 DE 102004033115A1 DE 200410033115 DE200410033115 DE 200410033115 DE 102004033115 A DE102004033115 A DE 102004033115A DE 102004033115 A1 DE102004033115 A1 DE 102004033115A1
- Authority
- DE
- Germany
- Prior art keywords
- cooking
- temperature
- resonant circuit
- radiator
- cookware
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/10—Tops, e.g. hot plates; Rings
- F24C15/102—Tops, e.g. hot plates; Rings electrically heated
- F24C15/106—Tops, e.g. hot plates; Rings electrically heated electric circuits
-
- 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
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/07—Heating plates with temperature control means
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Messung und Regelung der Temperatur des ferromagnetischen Bodens eines Kochgeschirrs, der mittels eines Kochheizkörpers durch eine nichtmetallische Kochfläche hindurch beheizt wird.The The invention relates to a method and a device for measuring and controlling the temperature of the ferromagnetic bottom of a cookware, the by means of a cooking radiator is heated by a non-metallic cooking surface.
In
der
In
der
Der
Erfindung liegt die Aufgabe zugrunde, die zur
Während der kurzen Schaltpause kann dem Schwingkreis zur Messung der Eigenfrequenz ein Schwingungsband mit zeitlich ansteigender oder abfallender Frequenz, zum Beispiel durch einen Wobbler, aufgeprägt werden, bis der Schwingkreis in Resonanz kommt. Die Resonanzfrequenz ist dann die Eigenfrequenz des Schwingkreises.During the short switching pause can the resonant circuit for measuring the natural frequency a vibration band with a time-increasing or decreasing frequency, For example, by a wobbler, be imprinted until the resonant circuit comes in resonance. The resonance frequency is then the natural frequency of the resonant circuit.
Es ist aber auch möglich, beim Abschalten der Kochleistung aus der Abklingkurve das Schwingkreises bezw. der in ihm gespeicherten Energie (z.B. durch Messung der Zeitspanne zwischen zwei Nulldurchgängen der Eigenschwingung) dessen Eigenfrequenz zu bestimmen.It but it is also possible when switching off the cooking power from the decay curve, the resonant circuit BEZW. the energy stored in it (e.g., by measuring the period of time between two zero crossings the natural vibration) whose natural frequency to determine.
Auch andere, zum Stand der Technik gehörende Verfahren zur Messung der Eigenfrequenz des Schwingkreises können im Rahmen der Erfindung zur Anwendung kommen.Also other prior art methods of measurement The natural frequency of the resonant circuit can in the invention for Application come.
Das Verfahren nach der Erfindung kann sowohl in Induktions-Kochherden als auch in Kochherden mit Strahlungsheizkörperr angewendet werden.The Method according to the invention can be used both in induction cookers as well as in cookers with radiant heaters.
Bei Verwendung einer Induktionsspule als Kochheizkörper ist der zur Ausübung des Verfahrens nach der Erfingung erforderliche Kondensator als Kommutierungskondensator normalerweise ohnehin vorhanden. Es muss lediglich darauf geachtet werden, dass ein Kondensator guter Qualität verwendet wird, dessen Kapazität durch die an seinem Einsatzort auftretenden Temperaturschwankungen nicht nennenswert beeinflusst wird. Es können auch zwei parallel geschaltete Kondensatoren eingesetzt werden, von denen einer einen positiven, der andere einen negativen Temperatur-Koeffizienten mit gleichem Betrag aufweist, sodass sich beide bezüglich ihrer Temperaturabhängigkeit kompensieren. So wird erreicht, dass die Eigenfrequenz und da mit die gemessene Temperatur nicht durch einen Temperaturgang des Kondensators verfälscht wird. Weiter ist es wichtig, dass unter der Induktionsspule normalerweise angeordnete Ferritplatten, die der Lenkung der Induktionsstrahlung nach oben in den Kochgeschirrboden dienen, eine konstante, von den dort auftretenden Temperaturschwankungen weitgehend unabhängige Permeabilität aufweisen, um auch diesen möglichen Störeinfluss auf die Eigenfrequenz des Schwingkreises auszuschliessen. Ferner sollten sich im Nahbereich der Induktionsspule auch keine anderen Metallteile befinden, deren Eigenschaftswerte in störendem Masse von dar Temperatur abhängen. Solche Störeinflüsse können zum Beispiel von der unteren Abdeckung einer Herdmulde ausgehen, wenn diese aus Stahlblech (und nicht aus Aluminium oder temperaturfestem Kunststoff) besteht. Auch ein aus Stahlblech bestehendes Backofengehäuse kann stören, wenn sein Abstand zur Induktionsspule nicht wesentlich grösser ist als der zwischen Induktionsspule und Kochgeschirrboden.at Use of an induction coil as a cooking radiator is the one to exercise the Method required after the Erfingung capacitor as Kommutierungskondensator usually available anyway. It just has to pay attention be that a capacitor of good quality is used, its capacity through The occurring at its site temperature fluctuations are not significant being affected. It can also two parallel connected capacitors are used, one of which has a positive, the other a negative temperature coefficient with the same amount, so that both respect their temperature dependence compensate. This ensures that the natural frequency and there with the measured temperature is not due to a temperature gradient of the capacitor falsified becomes. Next, it is important that under the induction coil normally arranged ferrite plates, which guide the induction radiation Serve upwards in the cookware tray, a constant, of the have temperature fluctuations that are largely independent of permeability, around this possible too interference effect to exclude to the natural frequency of the resonant circuit. Further should be in the vicinity of the induction coil and no other Metal parts are located whose property values are disturbing depend on the temperature. Such Disturbances can for Example emanating from the bottom cover of a hob, if These are made of sheet steel (and not made of aluminum or temperature resistant Plastic). Even an existing steel plate oven housing can interfere, if its distance from the induction coil is not significantly greater as that between induction coil and cookware bottom.
Bei Verwendung eines Strahlungsheizkörpers als Kochheizkörper muss sein Heizdraht anstelle der meist gewählten mäanderförmigen Anordnung als Spirale ausgebildet sein, ähnlich wie dies bei Induktionsspulen stets der Fall ist. Nur dann kann ein elektromagnetisches Messfeld vom Strahlungsheizkörper zum Kochgeschirrboden hin aufgebaut werden. Um Messfehler zu vermeiden, sollte der Heizdraht aus nicht ferromagnetischem Material bestehen, und auch in seinem Nahbereich sollten sich ausser dem Kochgeschirrboden keine anderen Metallgegenstände befinden, deren Eigenschaftswerte in störendem Masse von der Temperatur abhängen. Um Probleme bei dem häufigen Abschalten zu vermeiden und für die Messung der Eigenfrequenz stets die gleiche Startposition zu gewährleisten, wird durch eine Spezialschaltung die Kochleistung stets im Strom-Nulldurchgang abgeschaltet. Entsprechendes kann zum Einschalten im Spannungs-Nulldurchgang vorgesehen werden. Der erfindungsgemässe Kodensator liegt parallel zu dem mit Netzfrequenz (z.B. 50 Hz) betriebenen Strahlungsheizkörper. Seine Kapazität ist so zu bemessen, dass einerseits sein Blindstrom bei Netzfrequenz klein gegenüber dem Wirkstrom im Strahlungsheizkörper ist, sodass er im Normalbetrieb praktisch keine Rolle spielt. Andererseits soll die Kapazität so bemessen sein, dass der Kondensator zusammen mit dem Strahlungsheizkörper einen Hochfrequenzschwingkreis bildet, der z. B. Eigenfrequenzen in der Grössenordnung von um die 100 kHz hat.When using a radiant heater as a stove radiator must be heating wire le be the most selected meandering arrangement formed as a spiral, similar to that is always the case with induction coils. Only then can an electromagnetic measuring field be built up from the radiant heater to the bottom of the cookware. In order to avoid measurement errors, the heating wire should be made of non-ferromagnetic material, and also in its vicinity, there should be no other metal objects other than the bottom of the cookware, the property values of which depend to a great extent on the temperature. To avoid problems with the frequent shutdown and always ensure the same starting position for the measurement of the natural frequency, the cooking power is always switched off in the current zero crossing by a special circuit. The same can be provided for switching on in the voltage zero crossing. The inventive Kodensator is parallel to the operated at mains frequency (eg 50 Hz) radiant heater. Its capacity is to be dimensioned so that on the one hand its reactive current at mains frequency is small compared to the active current in the radiant heater, so that it plays virtually no role in normal operation. On the other hand, the capacity should be such that the capacitor forms a high-frequency resonant circuit together with the radiant heater, the z. B. has natural frequencies of the order of about 100 kHz.
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Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200410033115 DE102004033115A1 (en) | 2004-07-08 | 2004-07-08 | A method for controlling the temperature of a cooker heating system has an inductive temperature variable coil heating element and control system monitoring the specific resonant frequency |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE200410033115 DE102004033115A1 (en) | 2004-07-08 | 2004-07-08 | A method for controlling the temperature of a cooker heating system has an inductive temperature variable coil heating element and control system monitoring the specific resonant frequency |
Publications (1)
Publication Number | Publication Date |
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DE102004033115A1 true DE102004033115A1 (en) | 2006-02-09 |
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DE200410033115 Ceased DE102004033115A1 (en) | 2004-07-08 | 2004-07-08 | A method for controlling the temperature of a cooker heating system has an inductive temperature variable coil heating element and control system monitoring the specific resonant frequency |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007051638B3 (en) * | 2007-10-26 | 2009-08-20 | Rational Ag | Method for detecting the loading state of a cooking appliance with microwave cooking and cooking appliance for carrying out such a method |
DE102009047185A1 (en) * | 2009-11-26 | 2011-06-01 | E.G.O. Elektro-Gerätebau GmbH | A method and induction heater for detecting a temperature of a cooking vessel bottom heated by an induction heating coil |
WO2012092683A3 (en) * | 2011-01-07 | 2012-11-15 | Inducs Ag | Induction cooking device for temperature-controlled cooking |
DE102011079689A1 (en) * | 2011-07-22 | 2013-01-24 | E.G.O. Elektro-Gerätebau GmbH | Temperature measurement in the cooking vessel |
DE102011083397A1 (en) * | 2011-09-26 | 2013-03-28 | E.G.O. Elektro-Gerätebau GmbH | Method for preparing food by means of an induction heating device and induction heating device |
US20130087553A1 (en) * | 2011-09-26 | 2013-04-11 | E.G.O. Elektro-Gerätebau GmbH | Method for Heating a Cooking Vessel with an Induction Heating Device and Induction Heating Device |
US9451657B2 (en) | 2011-09-26 | 2016-09-20 | E.G.O. Elektro-Gerätebau GmbH | Method for heating a liquid in a cooking vessel and induction heating device |
GB2582930A (en) * | 2019-04-08 | 2020-10-14 | Edwards Ltd | Induction heating method and apparatus |
CN113654676A (en) * | 2020-05-12 | 2021-11-16 | 佛山市顺德区美的电热电器制造有限公司 | Heating temperature measurement circuit, temperature measurement circuit and cooking device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19808229A1 (en) * | 1998-02-27 | 1999-09-02 | Pks Systemtechnik | Repeated energizing of AC circuit switchgear |
DE10231122A1 (en) * | 2002-07-05 | 2004-01-22 | E.G.O. Elektro-Gerätebau GmbH | Method of measuring the temperature of a metal cooking vessel |
-
2004
- 2004-07-08 DE DE200410033115 patent/DE102004033115A1/en not_active Ceased
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19808229A1 (en) * | 1998-02-27 | 1999-09-02 | Pks Systemtechnik | Repeated energizing of AC circuit switchgear |
DE10231122A1 (en) * | 2002-07-05 | 2004-01-22 | E.G.O. Elektro-Gerätebau GmbH | Method of measuring the temperature of a metal cooking vessel |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007051638B3 (en) * | 2007-10-26 | 2009-08-20 | Rational Ag | Method for detecting the loading state of a cooking appliance with microwave cooking and cooking appliance for carrying out such a method |
DE102007051638B8 (en) * | 2007-10-26 | 2010-06-10 | Rational Ag | Method for detecting the loading state of a cooking appliance with microwave cooking and cooking appliance for carrying out such a method |
DE102009047185A1 (en) * | 2009-11-26 | 2011-06-01 | E.G.O. Elektro-Gerätebau GmbH | A method and induction heater for detecting a temperature of a cooking vessel bottom heated by an induction heating coil |
CN102186271A (en) * | 2009-11-26 | 2011-09-14 | E.G.O.电气设备制造股份有限公司 | Method and induction heating device for determining a temperature of the base of a cooking vessel |
EP2330866A3 (en) * | 2009-11-26 | 2012-03-07 | E.G.O. ELEKTRO-GERÄTEBAU GmbH | Method and induction heating device for determining a temperature of the base of a cooking vessel heated using an induction heating coil |
DE102009047185B4 (en) * | 2009-11-26 | 2012-10-31 | E.G.O. Elektro-Gerätebau GmbH | Method and induction heating device for determining a temperature of a cooking vessel bottom heated by means of an induction heating coil |
US10085303B2 (en) | 2009-11-26 | 2018-09-25 | E.G.O. Elektro-Geraetebau Gmbh | Method and induction heating device for determining a temperature of a cooking vessel base |
CN102186271B (en) * | 2009-11-26 | 2014-11-26 | E.G.O.电气设备制造股份有限公司 | Method and induction heating device for determining a temperature of the base of a cooking vessel |
WO2012092683A3 (en) * | 2011-01-07 | 2012-11-15 | Inducs Ag | Induction cooking device for temperature-controlled cooking |
US9867234B2 (en) | 2011-01-07 | 2018-01-09 | Garland Commercial Industries Llc | Induction cooking device for temperature-controlled cooking |
DE102011079689B4 (en) * | 2011-07-22 | 2014-07-03 | E.G.O. Elektro-Gerätebau GmbH | Temperature measurement in the cooking vessel |
US9544947B2 (en) | 2011-07-22 | 2017-01-10 | E.G.O. Elektro-Geraetebau Gmbh | Temperature measurement in a cooking vessel |
DE102011079689A1 (en) * | 2011-07-22 | 2013-01-24 | E.G.O. Elektro-Gerätebau GmbH | Temperature measurement in the cooking vessel |
US20130087553A1 (en) * | 2011-09-26 | 2013-04-11 | E.G.O. Elektro-Gerätebau GmbH | Method for Heating a Cooking Vessel with an Induction Heating Device and Induction Heating Device |
US9451657B2 (en) | 2011-09-26 | 2016-09-20 | E.G.O. Elektro-Gerätebau GmbH | Method for heating a liquid in a cooking vessel and induction heating device |
US9491807B2 (en) | 2011-09-26 | 2016-11-08 | E.G.O. Elektro-Gerätebau GmbH | Method for induction heating and induction heating device |
US9554424B2 (en) | 2011-09-26 | 2017-01-24 | E.G.O. Elektro-Gerätebau GmbH | Method for heating a cooking vessel with an induction heating device and induction heating device |
DE102011083397A1 (en) * | 2011-09-26 | 2013-03-28 | E.G.O. Elektro-Gerätebau GmbH | Method for preparing food by means of an induction heating device and induction heating device |
GB2582930A (en) * | 2019-04-08 | 2020-10-14 | Edwards Ltd | Induction heating method and apparatus |
GB2582930B (en) * | 2019-04-08 | 2023-01-11 | Edwards Ltd | Induction heating method and apparatus |
CN113654676A (en) * | 2020-05-12 | 2021-11-16 | 佛山市顺德区美的电热电器制造有限公司 | Heating temperature measurement circuit, temperature measurement circuit and cooking device |
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