DE2831858A1 - Hotplate switched on by presence of cooking utensil - measures voltage across AC-supplied capacitors and operates heating-circuit switch - Google Patents

Hotplate switched on by presence of cooking utensil - measures voltage across AC-supplied capacitors and operates heating-circuit switch

Info

Publication number
DE2831858A1
DE2831858A1 DE19782831858 DE2831858A DE2831858A1 DE 2831858 A1 DE2831858 A1 DE 2831858A1 DE 19782831858 DE19782831858 DE 19782831858 DE 2831858 A DE2831858 A DE 2831858A DE 2831858 A1 DE2831858 A1 DE 2831858A1
Authority
DE
Germany
Prior art keywords
heating
hotplate
sensor
capacitors
detector
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
Application number
DE19782831858
Other languages
German (de)
Inventor
Hans-Karl Ing Grad Dausel
Klaus Ing Grad Fischer
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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.)
Filing date
Publication date
Application filed by Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to DE19782831858 priority Critical patent/DE2831858A1/en
Publication of DE2831858A1 publication Critical patent/DE2831858A1/en
Ceased legal-status Critical Current

Links

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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Cookers (AREA)
  • Electric Stoves And Ranges (AREA)

Abstract

The hotplate is such that the presence of a cooking utensils closes its heating circuit. A detector (2) is located beneath the ceramic plate (1). The detector is connected to an oscillator (3). The voltage measured at the detector's output is used to control a switch in the hotplate's heating circuit. The detector consists of two capacitors. The voltage across these capacitors is rectified and filtered (4) and passed to a digital amplifier or transistor switch (5). Alternatively, a comparator may be used to evaluate the output voltage. The detector is located between the turns, or in the centre of, the spiral heating element.

Description

Elektrische Heiz- oder Kochplatte für Herde Electric heating or cooking plates for stoves

Die Erfindung betrifft eine elektrische Heiz- oder Kochplatte für Herde, bei welcher der Stromkreis für deren Beheizung erst durch Abstellen eines Kochgeschirres auf dieser schließbar ist.The invention relates to an electric heating or cooking plate for Stoves in which the circuit for heating them only by turning off a Cookware is lockable on this.

Aus der DE-OS 23 O9 741 ist eine Zeiz- oder Kochplatte bekannt, bei der durch Aufsetzen eines Kochgeschirrs die Stromzufuhr zu deren Beheizung geschlossen und bei Wegnahme des Eochgeschirrs selbsttätig wieder unterbrochen wird. Zu diesem Zweck ist im Zentrum der Kochplatte ein durchgehender Schaltstift vorgesehen, der einerseits über dessen Oberseite bzw. Abstellfläche geringfügig hinausragt und der andererseits durch Niederdrücken mittels des Kochgeschirrs einen die Energiezufuhr zur Kochplatten-Beheizung steuernden Schalter in Schließstellung bringt. Da zur Führung des Schaltstiftes hier eine Durchbrechung der Kochplatte erforderlich ist, wird hier keine geschlossene Kochfläche erreicht. Auch muß der herausragende Schaltstift mit einer flexiblen Abdeckung versehen werden, um ein Eindringen von Kochgut bzw.From DE-OS 23 O9 741 a Zeiz- or hot plate is known at who closed the power supply for heating them by putting on cookware and is automatically interrupted again when the Eochware is removed. To this Purpose, a continuous switching pin is provided in the center of the hotplate, the on the one hand protrudes slightly over the top or shelf and the on the other hand, the energy supply by pressing down by means of the cookware brings the switch controlling the hotplate heating to the closed position. There for Guide the switch pin here an opening in the hotplate is required, a closed cooking surface is not reached here. Also must be the protruding switch pin be provided with a flexible cover to prevent the ingress of food or food.

Schmutz in die Schalteinrichtung zu verhindern. Eine solche Einrichtung ist daher für aus Glaskeramik bestehenden Kochflächen nicht geeignet.To prevent dirt in the switching device. Such a facility is therefore not suitable for cooking surfaces made of glass ceramic.

Der Erfindung liegt deshalb die Aufgabe zugrunde, eine durch Aufsetzen eines Kochgeschirrs auf die Kochfläche einer Kochplatte dessen Beheizung einschaltende Einrichtung zu schaffen, die vor allem für aus Glaskeramik od. dgl. bestehende Kochplatten geeignet ist.The invention is therefore based on the object of a by placing a cookware on the hob of a hotplate whose heating is switched on To create a device that is mainly used for ceramic hobs. The like. Existing hotplates suitable is.

Die erfindungsgemäl3e Lösung dieser Aufgabe ist dem kennzeichnenden Teil des Patentanspruchs 1 zu entnehmen.The inventive solution to this problem is the characteristic one Part of claim 1 can be found.

Zweckmäßige Ausgestaltungen sind in den Unteransprüchen angegeben.Appropriate refinements are given in the subclaims.

Die vorgeschlagene Einrichtung arbeitet rein mit elektrischen bzw. elektronischen Schaltmitteln und ist daher insbesondere für aus Glaskeramik od. dgl. bestehende Kochplatten mit Vorteil geeignet, so daß deren vorteilhafte ebene und glatte Kochfläche erhalten bleibt und trotzdem die größtmögliche Sicherheit für diese Kochplatte gegeben ist.The proposed device works purely with electrical resp. electronic switching means and is therefore particularly suitable for od glass ceramic. Like. Existing hotplates suitable with advantage, so that their advantageous plane and smooth cooking surface is preserved and still the greatest possible safety is given for this hotplate.

Ein Ausführungsbeispiel der Erfindung ist im Prinzip in der beiliegenden Zeichnung dargestellt und wird an Rand dieser nachfolgend näher beschrieben.An embodiment of the invention is in principle in the enclosed Drawing shown and is described in more detail at the edge of this below.

Der mittels einer üblichen elektrischen Heizwendel beheizten Kochplatte 1 aus Glaskeramik ist ein Sensor 2 zugeordnet, der aus zwei Kondensatoren gebildet ist. Der Sensor 2 kann dabei zwischen den Windungen oder im Zentrum der Heizwendel angeordnet sein. Der Sensor 2 ist über einen vorgeschalteten Oszillator 3 ansteuerbar. Wird nun auf die Kochplatte 1 ein Kochgeschirr 10 abgestellt, so spricht der Sensor 2 in der Weise an, daß der Stromkreis für die Heizwendel der Kochplatte geschlossen und diese auf die vorgewählte Temperatur aufgeheizt werden kann.The hotplate heated by means of a conventional electrical heating coil 1 made of glass ceramic is assigned a sensor 2, which is formed from two capacitors is. The sensor 2 can be between the turns or in the center of the heating coil be arranged. The sensor 2 can be controlled via an upstream oscillator 3. If a cookware 10 is now placed on the hotplate 1, the sensor speaks 2 in such a way that the circuit for the heating coil of the hotplate is closed and this can be heated to the preselected temperature.

Das Einschalten der Beheizung bzw. Schließen des Heizstromkreises geschieht dabei in der Weise, daß die am Ausgang des Sensors 2 gemessene bzw. erfaßte, gegenüber der Eingangs-Spannung erhöhte Ausgangs-Spannung über einem Gleichrichter 4 mit Filter einen Schaltverstärker 5 zugeführt wird. Die Auswertung der Sensorausgangs-Spannung kann auch direkt mit einem Komparator 6 erfolgen, der dann an Stelle des Gleichrichters 4 und Schaltverstärker 5 tritt. Diese erhöhte Ausgangs-Spannung dient dann als Steuergröße für eine Schaltelektronik, welche den Stromkreis der elektrischen Heizwendel für die Kochplatte beherrscht.Switching on the heating or closing the heating circuit happens in such a way that the measured or detected at the output of the sensor 2, Output voltage higher than the input voltage via a rectifier 4 a switching amplifier 5 is supplied with a filter. The evaluation of the sensor output voltage can also be done directly with a comparator 6, which then takes the place of the rectifier 4 and switching amplifier 5 occurs. This increased output voltage then serves as a control variable for a switching electronics, which the circuit of the electrical heating coil for mastered the hotplate.

Nach Abnehmen des Kochgeschirrs von der Kochplatte 1 wird der Stromkreis zur Reizwendel und somit die Beheizung sofort wieder unterbrochen. Mit der beschriebenen Einrichtung wird damit sichergestellt, daß Fehleinschaltungen von Kochplatten vermieden werden.After removing the cookware from the hotplate 1, the circuit is to the stimulus coil and thus the heating is immediately interrupted again. With the described This ensures that incorrect switching on of hotplates is avoided will.

Ferner wird beispielsweise bei Verwendung von Keramik-Steinguttöpfen als Kochgeschirr eine Unterbrechung des Heiz-Stromkreises auch schon dann bewirkt, wenn in diesen die Kochflüssigkeit völlig verdampft ist und ein Entfernen des betreffenden Eochgeschirrs von der Kochplatte nicht rechtzeitig vorgenommen wird.Furthermore, for example, when using ceramic earthenware pots as cookware causes an interruption of the heating circuit even then, if in these the cooking liquid has completely evaporated and a removal of the relevant Cookware is not removed from the hotplate in time.

Claims (5)

Patentansprüche rB 0 Elektrische Heiz- oder Kochplatte für Herde, bei welcher der Stromkreis für deren Beheizung erst durch Abstellen eines Kochgeschirrs auf dieser schließbar ist, dadurch gekennzeichnet, daß unterhalb der aus Glaskeramik od. dgl. bestehenden Seiz- oder Kochplatte (1) ein Sensor (2) vorgesehen ist, der über ein in Serie liegenden Oszillator (3) ansteuerbar ist und daß die am Ausgang des Sensors gemessene Ausgangs-Spannung als Steuergröße für eine Schaltelektronik zum Steuern der Beheizung für die Eeiz- oder Kochplatte dient. Claims rB 0 Electric heating or cooking plate for cookers, in which the electric circuit for their heating only by putting down a cookware can be closed on this, characterized in that underneath the glass ceramic Od. Like. Existing Seiz or hot plate (1) a sensor (2) is provided which can be controlled via a series oscillator (3) and that the output output voltage measured by the sensor as a control variable for switching electronics is used to control the heating for the Eeiz- or hotplate. 2. Heiz- oder Kochplatte nach Anspruch 1, dadurch gekennzeichnet, daß der Sensor (2) aus zwei Kondensatoren gebildet ist. 2. heating or cooking plate according to claim 1, characterized in that that the sensor (2) is formed from two capacitors. 3. Heiz- oder Kochplatte nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die am Ausgang des Sensors (2) gemessene Ausgangs-Spannung über einemGleichrichter und Filter (4) einen Schaltverstärker (5) zugeführt wird. 3. heating or cooking plate according to claim 1 or 2, characterized in that that the output voltage measured at the output of the sensor (2) via a rectifier and filter (4) is fed to a switching amplifier (5). 4. Heiz- oder Kochplatte nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Auswertung der Sensorausgangs-Spannung mittels eines Komperators (6) erfolgt. 4. heating or cooking plate according to claim 1 or 2, characterized in that that the evaluation of the sensor output voltage is carried out by means of a comparator (6). 5. Xeiz- oder Kochplatte nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Sensor (2) zwischen den Windungen oder im Zentrum der wendelartigen Beheizung der Kochplatte angeordnet ist. 5. Xeiz- or hotplate according to claim 1 or 2, characterized in that that the sensor (2) between the windings or in the center of the helical heating the hotplate is arranged.
DE19782831858 1978-07-20 1978-07-20 Hotplate switched on by presence of cooking utensil - measures voltage across AC-supplied capacitors and operates heating-circuit switch Ceased DE2831858A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19782831858 DE2831858A1 (en) 1978-07-20 1978-07-20 Hotplate switched on by presence of cooking utensil - measures voltage across AC-supplied capacitors and operates heating-circuit switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782831858 DE2831858A1 (en) 1978-07-20 1978-07-20 Hotplate switched on by presence of cooking utensil - measures voltage across AC-supplied capacitors and operates heating-circuit switch

Publications (1)

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DE2831858A1 true DE2831858A1 (en) 1980-02-07

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Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3229380A1 (en) * 1981-08-08 1983-02-24 Micropore International Ltd RADIATION HEATER FOR COOKERS WITH GLASS CERAMIC PLATES
DE3327622A1 (en) * 1983-07-30 1985-02-07 Blanc Gmbh & Co, 7519 Oberderdingen Electrical hotplate for a glass-ceramic cooking plate
DE3444348A1 (en) * 1984-12-05 1986-06-12 Diehl Gmbh & Co Device for electrical irons having a heating device which is preferably mains-powered
DE3619762A1 (en) * 1986-06-12 1987-12-23 Licentia Gmbh Pan recognition device
EP0286215A1 (en) * 1987-02-25 1988-10-12 THORN EMI plc Electrically resistive tracks
DE3711589A1 (en) * 1987-04-06 1988-10-27 Kueppersbusch Cooking appliance
DE3715497A1 (en) * 1987-05-09 1988-11-17 Braun Ag SAFETY SWITCHING DEVICE FOR CONTROLLING A POWER CONSUMER
DE3720720A1 (en) * 1987-06-23 1989-01-05 Bosch Siemens Hausgeraete Energy transmission for wire-free domestic appliances
DE3733108C1 (en) * 1987-09-30 1989-02-23 Bosch Siemens Hausgeraete Circuit arrangement for a pot (saucepan) recognition system with a pot recognition sensor
DE3737712A1 (en) * 1987-11-06 1989-05-24 Licentia Gmbh Method and device for protecting an electric stove against inadvertent operation
EP0374868A1 (en) * 1988-12-23 1990-06-27 INDUSTRIEELEKTRONIK DR.ING. WALTER KLASCHKA GMBH & CO. Cooking hob
FR2645660A1 (en) * 1989-04-06 1990-10-12 Gatineau Jacques Method for control of processing appliances, especially for cooking, and device for implementing the method
US5001328A (en) * 1986-02-26 1991-03-19 E.G.O. Eleckro-Gerate Blanc U. Fischer Cooking unit with radiant heaters
DE3934157A1 (en) * 1989-10-12 1991-04-18 Bosch Siemens Hausgeraete Hotplate with elements switched according to pan size - exploits effect on capacitance ratios among concentric sensing rings when large or small vessel is imposed
EP0429120A2 (en) * 1989-11-17 1991-05-29 Whirlpool Europe B.V. Device for detecting the presence of a food cooking container on a cooking hob
DE4004129A1 (en) * 1990-02-10 1991-08-14 Ego Elektro Blanc & Fischer DEVICE FOR RECOGNIZING A COOKING VESSEL SET UP IN A HEATING ZONE OF A COOKING OR HEATING APPLIANCE
EP0469189A2 (en) * 1990-08-02 1992-02-05 Oskar Locher Ag Method and apparatus for controlling heating elements of a cooking oven
DE4038017A1 (en) * 1990-11-29 1992-06-04 Ego Elektro Blanc & Fischer Electric hotplate with sensing unit identifying pan - in form of induction coil embedded in recess of insulating body mounted in opening
EP0520213A1 (en) * 1991-06-28 1992-12-30 BOSCH-SIEMENS HAUSGERÄTE GmbH Mains shock protection for sensors under glass ceramic hob
US5243172A (en) * 1990-09-28 1993-09-07 U.S. Philips Corp. Cook-top with automatic controls
EP0620698A1 (en) * 1993-04-13 1994-10-19 Whirlpool Europe B.V. Device for detecting the presence of a food container, such as a saucepan, dish or the like, on a glass ceramic cooking hob
US5424512A (en) * 1992-01-28 1995-06-13 Whirlpool Europe B.V. Method and device for detecting the presence of a body, for example a saucepan, on a glass ceramic cooking hob in correspondence with a heating element associated with said hob
US5491423A (en) * 1993-03-15 1996-02-13 Whirlpool Europe B.V. Device for detecting the presence of a food container, such as a saucepan, dish or the like, on a glass ceramic cooking hob
WO1998031198A1 (en) * 1997-01-11 1998-07-16 Schott Glaswerke Cooktop with a non-metallic hotplate
DE4224934C2 (en) * 1992-07-28 2003-05-15 Bsh Bosch Siemens Hausgeraete Radiator with sensor technology for a pan detection system

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3229380A1 (en) * 1981-08-08 1983-02-24 Micropore International Ltd RADIATION HEATER FOR COOKERS WITH GLASS CERAMIC PLATES
DE3327622A1 (en) * 1983-07-30 1985-02-07 Blanc Gmbh & Co, 7519 Oberderdingen Electrical hotplate for a glass-ceramic cooking plate
DE3444348A1 (en) * 1984-12-05 1986-06-12 Diehl Gmbh & Co Device for electrical irons having a heating device which is preferably mains-powered
US5001328A (en) * 1986-02-26 1991-03-19 E.G.O. Eleckro-Gerate Blanc U. Fischer Cooking unit with radiant heaters
DE3619762A1 (en) * 1986-06-12 1987-12-23 Licentia Gmbh Pan recognition device
EP0286215A1 (en) * 1987-02-25 1988-10-12 THORN EMI plc Electrically resistive tracks
DE3711589A1 (en) * 1987-04-06 1988-10-27 Kueppersbusch Cooking appliance
US4859869A (en) * 1987-05-09 1989-08-22 Braun Aktiengesellschaft Safety switching means for controlling a current consumer
DE3715497A1 (en) * 1987-05-09 1988-11-17 Braun Ag SAFETY SWITCHING DEVICE FOR CONTROLLING A POWER CONSUMER
DE3720720A1 (en) * 1987-06-23 1989-01-05 Bosch Siemens Hausgeraete Energy transmission for wire-free domestic appliances
DE3733108C1 (en) * 1987-09-30 1989-02-23 Bosch Siemens Hausgeraete Circuit arrangement for a pot (saucepan) recognition system with a pot recognition sensor
DE3737712A1 (en) * 1987-11-06 1989-05-24 Licentia Gmbh Method and device for protecting an electric stove against inadvertent operation
EP0374868A1 (en) * 1988-12-23 1990-06-27 INDUSTRIEELEKTRONIK DR.ING. WALTER KLASCHKA GMBH & CO. Cooking hob
WO1990007851A1 (en) * 1988-12-23 1990-07-12 Industrieelektronik Dr.Ing. Walter Klaschka Gmbh & Co. Cook top
FR2645660A1 (en) * 1989-04-06 1990-10-12 Gatineau Jacques Method for control of processing appliances, especially for cooking, and device for implementing the method
DE3934157A1 (en) * 1989-10-12 1991-04-18 Bosch Siemens Hausgeraete Hotplate with elements switched according to pan size - exploits effect on capacitance ratios among concentric sensing rings when large or small vessel is imposed
DE3934157C2 (en) * 1989-10-12 1999-01-28 Bosch Siemens Hausgeraete Hob
EP0429120A2 (en) * 1989-11-17 1991-05-29 Whirlpool Europe B.V. Device for detecting the presence of a food cooking container on a cooking hob
EP0429120A3 (en) * 1989-11-17 1991-09-11 Whirlpool International B.V. Device for detecting the presence of a food cooking container on a cooking hob
DE4004129A1 (en) * 1990-02-10 1991-08-14 Ego Elektro Blanc & Fischer DEVICE FOR RECOGNIZING A COOKING VESSEL SET UP IN A HEATING ZONE OF A COOKING OR HEATING APPLIANCE
US5296684A (en) * 1990-02-10 1994-03-22 E.G.O. Elektro-Gerate Blanc U. Fischer Device for detecting a cooking vessel positioned in a heating zone of a cooker or heater
EP0469189A2 (en) * 1990-08-02 1992-02-05 Oskar Locher Ag Method and apparatus for controlling heating elements of a cooking oven
EP0469189A3 (en) * 1990-08-02 1993-06-09 Oskar Locher Ag Method and apparatus for controlling heating elements of a cooking oven
US5243172A (en) * 1990-09-28 1993-09-07 U.S. Philips Corp. Cook-top with automatic controls
DE4038017A1 (en) * 1990-11-29 1992-06-04 Ego Elektro Blanc & Fischer Electric hotplate with sensing unit identifying pan - in form of induction coil embedded in recess of insulating body mounted in opening
EP0520213A1 (en) * 1991-06-28 1992-12-30 BOSCH-SIEMENS HAUSGERÄTE GmbH Mains shock protection for sensors under glass ceramic hob
US5296682A (en) * 1991-06-28 1994-03-22 Bosch-Siemens Hausgeraete Gmbh AC power line voltage contact protector for sensors under glass-ceramic cooktops utilizing rejection filter
US5424512A (en) * 1992-01-28 1995-06-13 Whirlpool Europe B.V. Method and device for detecting the presence of a body, for example a saucepan, on a glass ceramic cooking hob in correspondence with a heating element associated with said hob
DE4224934C2 (en) * 1992-07-28 2003-05-15 Bsh Bosch Siemens Hausgeraete Radiator with sensor technology for a pan detection system
US5491423A (en) * 1993-03-15 1996-02-13 Whirlpool Europe B.V. Device for detecting the presence of a food container, such as a saucepan, dish or the like, on a glass ceramic cooking hob
EP0620698A1 (en) * 1993-04-13 1994-10-19 Whirlpool Europe B.V. Device for detecting the presence of a food container, such as a saucepan, dish or the like, on a glass ceramic cooking hob
WO1998031198A1 (en) * 1997-01-11 1998-07-16 Schott Glaswerke Cooktop with a non-metallic hotplate

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