EP1087640B1 - Dispositif de reconnaissance de présence et/ou de taille d'un pot - Google Patents

Dispositif de reconnaissance de présence et/ou de taille d'un pot Download PDF

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Publication number
EP1087640B1
EP1087640B1 EP00119241A EP00119241A EP1087640B1 EP 1087640 B1 EP1087640 B1 EP 1087640B1 EP 00119241 A EP00119241 A EP 00119241A EP 00119241 A EP00119241 A EP 00119241A EP 1087640 B1 EP1087640 B1 EP 1087640B1
Authority
EP
European Patent Office
Prior art keywords
heating element
resistance heating
cooking
resonant circuit
cooking plate
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.)
Expired - Lifetime
Application number
EP00119241A
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German (de)
English (en)
Other versions
EP1087640A3 (fr
EP1087640A2 (fr
Inventor
Henno Schotten
Norbert Mörsch
Jörg Meyer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Diehl AKO Stiftung and Co KG
Original Assignee
Diehl AKO Stiftung and Co KG
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Diehl AKO Stiftung and Co KG filed Critical Diehl AKO Stiftung and Co KG
Publication of EP1087640A2 publication Critical patent/EP1087640A2/fr
Publication of EP1087640A3 publication Critical patent/EP1087640A3/fr
Application granted granted Critical
Publication of EP1087640B1 publication Critical patent/EP1087640B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/746—Protection, e.g. overheat cutoff, hot plate indicator
    • 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
    • H05B2213/05—Heating plates with pan detection means

Definitions

  • the invention relates to a device for detecting the presence and / or the size of a cooking vessel on an electrically heated cooking plate according to the preamble of claim 1.
  • EP 0 788 293 A1 describes an electric radiant heater with pan detection, in which an inductive sensor in the form of a loop of thick wire is used, which is mounted in the air space between heating conductor and hotplate and serves as an inductive element of a resonant circuit, the resonant frequency shifts when setting up a pot on the hotplate by changing the inductance of the wire loop.
  • DE 196 46 826 A1 discloses a pot detection is disclosed in which capacitive sensors are used, which are formed by a plurality of electrodes, are also located between heating and cooking plate and with which an electrical resonant circuit is operated. When placing a pot on the hotplate, the capacity of these sensors and thus also the resonant frequency of the resonant circuit changes. Further arrangements of capacitive measuring electrodes for pot detection underneath glass ceramic cooking plates are described, for example, in DE 196 43 698 A1, DE 196 48 199 A1 and EP 0 652 688 A1.
  • a cooktop in which a plurality of sensors are mounted to detect the footprint of different sized cooking vessels in the hob.
  • a sensor capacitive the heat flow measuring, the radiation emanating from heating and hotplate radiation or ultrasonic sensors are provided.
  • an electrical conductor is used as the sensor, which forms an open loop and is mounted between the heating element and the cooking plate. When placing a pot on the hotplate, the conductivity of this sensor changes.
  • the present invention has the object to realize a simply constructed pan detection, which does not have the disadvantages mentioned above.
  • the resistance heating element itself as a capacitive sensor for pot detection
  • an additional sensor which would have to be accommodated in the system hotplate resistance heating, is not necessary.
  • a deterioration of the electrical insulation system heating cooker is excluded from the outset.
  • an air gap between the heating element and hotplate is not necessary, and the heating element can be brought into direct contact with the hotplate.
  • the invention is designed so that the capacitance of the resistance heating element against a reference potential, preferably connected to earth, is connected in an electrical resonant circuit that the resonant frequency of this resonant circuit can be detected by an evaluation and so that the presence and / or size of a cooking vessel on the hotplate can be determined.
  • the resistance heating element is preferably connected via electrical switching means, preferably throttles, to the heating voltage supply and connected via a further electrical switching means, preferably a separating capacitor, in the resonant circuit.
  • the resonant circuit includes the resistance heating element, the separation capacitor, an inductive element, preferably a coil, and the reference potential.
  • a capacitor is connected between the electrical terminals of the resistance heating element.
  • multi-circuit hotplates can be used in a further development of the invention, several resonant circuits, in each case the heating element forming the corresponding heating circuit is used as a capacitive sensor for pot detection.
  • the cooking plate made of ceramic or glass ceramic, that the resistance heating element is a radiant heater, a foil heater or a heating layer applied to a carrier or heating track and that the resistance heating element has line windings or a flat band.
  • the size of a cooking vessel standing on the hotplate or the extent of the covering of the hotplate by a cooking vessel of the evaluation unit recognizable.
  • the invention relates to a device for pot detection, which is not only determined whether a cooking vessel is on the hotplate or not, but also how much of the surface of the cooking plate is covered by a cooking vessel, whether a large or a small cooking vessel is on the hotplate and whether it is centrally or laterally shifted.
  • a device for pot detection has a resistance heating element 1 located under an electrically heated cooking plate (FIG. 1). This is connected via two lines 2, 3 to an electrical Walkerwoodsmakers with 230 volts AC. In the lines 2, 3, two throttles DR1 and DR2 are connected. These have low impedance for the low-frequency heating voltage (50 or 60 Hz), thus allowing the heating current to flow almost unhindered.
  • a coil L is connected at branch point 4 via a separator capacitor CN which, on the other hand, is connected to housing 5 and to ground connected is.
  • the resistance heating element 1 or its capacitance to the grounded housing 5, the separating capacitor CN, the coil L and ground form a resonant circuit.
  • the isolating capacitor CN has a very high impedance for low frequencies, but a very low one for high frequencies. This will prevent the low frequency 230 volt supply voltage from being shorted to ground. On the other hand, it allows high frequency currents, as they occur in such resonant circuits, happen almost unhindered. Thus, the separation capacitor CN effectively disconnects the oscillation circuit from the heating circuit.
  • the chokes DR1 and DR2 have a high impedance for the high frequencies of the resonant circuit, so that these high frequencies can not get into the mains.
  • a capacitor CP is connected on the side remote from the supply voltage of the chokes DR1 and DR2. This in turn has a very high impedance for the low-frequency supply voltage, so does not let the heating current through; However, it has a very low impedance for high frequencies (ie for those of the resonant circuit), thus allowing them to pass through unhindered.
  • the interposition of the capacitor CP shows that both terminals of the resistance heating element 1 for the high frequencies of the resonant circuit are at the same potential and so the entire surface of the heating element 1 can be used as a capacitance-forming capacitor surface.
  • FIG. 2 an equivalent circuit diagram of the resonant circuit of Fig. 1 is shown, which - as mentioned above - is separated from the low-frequency heating circuit.
  • CH denotes the capacity of the heating element 1 to ground. This capacity CH changes - as will be explained in more detail below - when a cooking pot 6 is placed on the hotplate. This change in capacitance of CH also changes the resonant frequency of the resonant circuit.
  • FIG 3 is outlined how the capacitance CH of the resistance heating element 1 is composed of earth.
  • the heating element 1 is embedded in an insulating layer 7, in the housing 5.
  • About the heating element 1 is a glass ceramic plate 8, on which the cooking pot 6 is.
  • the resistance heating element 1 now has on the one hand a capacitance against the grounded housing 5, that is to earth. This capacity is designated CG.
  • the heating element 1 but also has a capacity CT relative to the cooking pot 6.
  • the cooking pot 6 in turn also has a capacity to earth, which is designated by CE.
  • the evaluation unit (not shown) can pick up the voltage in the resonant circuit at the connection points A1 or A2 (in each case to ground) or between the points A3 and A4.
  • the terminals A3 and A4 are connected to the two ends of a coil L ', which is coupled to the coil L of the resonant circuit.
  • the evaluation of the signals thus transmitted in the evaluation unit takes place according to the general state of the art.
  • the frequency of the resonant circuit can be determined by z. B. the vibrations are counted in a certain time interval.
  • With the help of the size of the frequency change of the resonant circuit can be detected in the evaluation unit, how large the installed cooking vessel or how far a cooking vessel is pushed onto the cooking plate or pulled away from the cooking plate.
  • the respective heating circuit can be used as a separate sensor and thus the size of the installed pot can be determined.
  • a plurality of heating elements separated from the respective heating voltage supply via isolating capacitors to be connected together to form a capacitive sensor.
  • the size of the installed pot is determined by the extent of the frequency change in the resonant circuit.
  • the evaluation After detecting the conditions on the hotplate, the evaluation sends corresponding signals to a control unit for the hotplate, which then z. B. switches off the heater when no cooking vessel is on the hotplate, in the presence of a small pot turns on only the inner heating circuit, in the presence of a large pot both heating circuits turns on or off the heating even if the cooking vessel too far from the central position the cooking plate is pushed away.
  • the control unit can also be set so that it ignores the signals of the evaluation of pan detection and controls the heating only according to preset settings

Claims (10)

  1. Dispositif de détection de la présence et/ou de la taille d'un récipient de cuisson sur une plaque de cuisson à chauffage électrique comprenant un élément chauffant résistif qui se trouve sous la plaque de cuisson et qui est raccordé à une alimentation électrique de chauffage, caractérisé en ce que l'élément chauffant résistif (1) est utilisé en tant que capteur capacitif pour la détection de casserole.
  2. Dispositif selon la revendication 1, caractérisé en ce que la capacité de l'élément chauffant résistif (1) est branchée par rapport à un potentiel de référence, de préférence par rapport à la terre, dans un circuit électrique oscillant dont la fréquence de résonnance peut être détectée par une unité d'interprétation, la présence et/ou la taille d'un récipient de cuisson (6) sur la plaque de cuisson pouvant ainsi être déterminées.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que l'élément chauffant résistif (1) est raccordé à l'alimentation électrique de chauffage par le biais de moyens de commutation électriques, de préférence des bobines (DR1, DR2), et branché dans le circuit oscillant par le biais d'un moyen de commutation électrique supplémentaire, de préférence un condensateur d'isolement (CN).
  4. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que le circuit oscillant comprend l'élément chauffant résistif (1), le condensateur d'isolement (CN), un élément inductif, de préférence une bobine (L), et le potentiel de référence.
  5. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'un condensateur (CP) est branché entre les bornes électriques de l'élément chauffant résistif (1).
  6. Dispositif selon l'une des revendications précédentes, caractérisé en ce que plusieurs circuits oscillants peuvent être utilisés en présence de plaques de cuisson à plusieurs circuits, l'élément chauffant formant le circuit chauffant correspondant constituant à chaque fois le capteur capacitif pour la détection de casserole.
  7. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la plaque de cuisson est en céramique ou en vitrocéramique.
  8. Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'élément chauffant résistif (1) est un corps chauffant à rayonnement, un élément chauffant en film ou encore une couche chauffante ou un ruban chauffant appliqué sur un support.
  9. Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'élément chauffant résistif (1) présente des enroulements conducteurs ou un ruban plat.
  10. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la taille d'un récipient de cuisson (6) posé sur la plaque de cuisson ou l'étendue du recouvrement de la plaque de cuisson par un récipient de cuisson (6) peut être détectée en se basant sur la valeur ou la modification de la fréquence de résonance du circuit oscillant.
EP00119241A 1999-09-22 2000-09-06 Dispositif de reconnaissance de présence et/ou de taille d'un pot Expired - Lifetime EP1087640B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19945297 1999-09-22
DE19945297A DE19945297A1 (de) 1999-09-22 1999-09-22 Topferkennung
US09/666,636 US6259069B1 (en) 1999-09-22 2000-09-21 Apparatus for detecting the presence of a cooking vessel

Publications (3)

Publication Number Publication Date
EP1087640A2 EP1087640A2 (fr) 2001-03-28
EP1087640A3 EP1087640A3 (fr) 2003-09-17
EP1087640B1 true EP1087640B1 (fr) 2006-11-02

Family

ID=26055028

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00119241A Expired - Lifetime EP1087640B1 (fr) 1999-09-22 2000-09-06 Dispositif de reconnaissance de présence et/ou de taille d'un pot

Country Status (5)

Country Link
US (1) US6259069B1 (fr)
EP (1) EP1087640B1 (fr)
AT (1) ATE344609T1 (fr)
DE (2) DE19945297A1 (fr)
ES (1) ES2275464T3 (fr)

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IT1319292B1 (it) * 2000-11-08 2003-10-10 Whirlpool Co Dispositivo per rilevare la collocazione di utensili di cottura su unpiano di cottura ad elementi riscaldanti discreti e distribuiti.
US6583392B2 (en) * 2000-12-22 2003-06-24 General Electric Company Apparatus and method for determining properties of a cooktop using ultrasound techniques
DE10129175A1 (de) * 2001-06-12 2003-01-09 Ego Elektro Geraetebau Gmbh Elektrischer Strahlungsheizkörper mit einem Sensor zur Kochgefäßerkennung
US6492627B1 (en) * 2001-07-26 2002-12-10 Emerson Electric Co. Heating unit and control system for cooktops having capability to detect presence of a pan and methods of operating same
CA2358602A1 (fr) * 2001-10-09 2003-04-09 Norax Canada Inc. Chauffage par conduction regule par circuit resonnant
DE10156777B4 (de) * 2001-11-19 2012-08-02 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zur Übertragung der Einstellungsdaten einer Kochstelle auf eine andere Kochstelle sowie Gargerät zur Durchführung dieses Verfahrens
ITMI20031602A1 (it) * 2003-08-04 2005-02-05 Whirlpool Co Piano di cottura a piazzamento casuale con interfaccia utente
US20050067399A1 (en) * 2003-09-30 2005-03-31 Chen-Lung Huang Safety device of a coffee pot
US6834160B1 (en) * 2003-11-14 2004-12-21 Huang Chen-Lung Electric heater with a sensor preventing no-water heating
DE102005050035A1 (de) * 2005-10-14 2007-07-19 E.G.O. Elektro-Gerätebau GmbH Verfahren zur Topferkennung und Induktionsheizeinrichtung
FR2895639B1 (fr) * 2005-12-27 2008-02-29 Brandt Ind Sas Foyer de cuisson par induction de taille variable
US20080153182A1 (en) * 2006-12-21 2008-06-26 Sokudo Co., Ltd Method and system to measure and compensate for substrate warpage during thermal processing
US20080160462A1 (en) * 2007-01-03 2008-07-03 Sokudo Co., Ltd. Method and system for bake plate heat transfer control in track lithography tools
KR20080068775A (ko) * 2007-01-20 2008-07-24 삼성전자주식회사 용기센서와 이를 갖는 발열유닛 및 그 발열유닛을 갖는조리장치와 그 제어방법
JP5145822B2 (ja) * 2007-08-20 2013-02-20 セイコーエプソン株式会社 噴射検査装置、印刷装置及び噴射検査方法
EP2194754A1 (fr) 2008-12-05 2010-06-09 Electrolux Home Products Corporation N.V. Agencement de capteur pour la détection d'un appareil de cuisson
ES2356441B1 (es) * 2008-12-19 2012-03-13 Bsh Electrodomésticos España, S.A. Campo de cocción con un inductor, un inversor y un dispositivo de conexión.
FI122808B (fi) 2009-02-24 2012-07-13 Marimils Oy Tasoelektrodijärjestelmä
ES2362782B1 (es) * 2009-04-17 2012-05-22 Bsh Electrodomésticos España, S.A. Campo de cocción con una disposición de detección y procedimiento para accionar un campo de cocción.
DE102009020905A1 (de) 2009-05-12 2010-12-09 Diehl Ako Stiftung & Co. Kg Kochfeld
GB0913704D0 (en) * 2009-08-05 2009-09-16 Next Row Ltd Induction heating unit for hair rollers
US8699299B2 (en) * 2010-04-26 2014-04-15 Semiconductor Components Industries, Llc Self-tuning acoustic measurement system
DE102012006847A1 (de) * 2012-04-04 2013-10-10 Rational Aktiengesellschaft Gargerät mit Einschuberkennung
DE102013201386A1 (de) * 2013-01-29 2014-07-31 BSH Bosch und Siemens Hausgeräte GmbH Kochfeld mit einer Kochfeldplatte und einer Leiterbahn als Flächenbegrenzung für Elektronikkomponenten
ITUB20155746A1 (it) * 2015-11-19 2017-05-19 De Longhi Appliances Srl Apparato per la cottura di alimenti e relativo metodo di cottura
EP3768043A4 (fr) * 2018-03-16 2021-03-17 Mitsubishi Electric Corporation Appareil de cuisson à induction
GB2593468B (en) * 2020-03-23 2022-04-13 Equip Line Ltd An apparatus for heating a pot of food or beverage

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GB2321699B (en) * 1997-01-31 1999-11-17 Ceramaspeed Ltd Electric heating method

Also Published As

Publication number Publication date
EP1087640A3 (fr) 2003-09-17
DE19945297A1 (de) 2001-03-29
DE50013682D1 (de) 2006-12-14
ES2275464T3 (es) 2007-06-16
US6259069B1 (en) 2001-07-10
EP1087640A2 (fr) 2001-03-28
ATE344609T1 (de) 2006-11-15

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