EP0522345A1 - Supply voltage isolation with sensors below glass-ceramic cooking hob plates. - Google Patents

Supply voltage isolation with sensors below glass-ceramic cooking hob plates. Download PDF

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Publication number
EP0522345A1
EP0522345A1 EP19920110533 EP92110533A EP0522345A1 EP 0522345 A1 EP0522345 A1 EP 0522345A1 EP 19920110533 EP19920110533 EP 19920110533 EP 92110533 A EP92110533 A EP 92110533A EP 0522345 A1 EP0522345 A1 EP 0522345A1
Authority
EP
European Patent Office
Prior art keywords
sensor
glass ceramic
mains voltage
ceramic cooking
glass
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.)
Granted
Application number
EP19920110533
Other languages
German (de)
French (fr)
Other versions
EP0522345B1 (en
Inventor
Manfred Dipl.-Ing. Plankl
Günther Dipl.-Ing. Wittauer (FH)
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.)
BOSCH-SIEMENS HAUSGERAETE GMBH
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Individual
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Publication of EP0522345A1 publication Critical patent/EP0522345A1/en
Application granted granted Critical
Publication of EP0522345B1 publication Critical patent/EP0522345B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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 mains voltage insulation for sensors under glass ceramic cooktops, wherein a metallic sensor is arranged under a glass ceramic cooktop inside or outside the hot area of the glass ceramic cooktop caused by a radiant heater.
  • the object of the invention is therefore to be able to operate metallic sensors below the glass ceramic cooktop in the hot area thereof without having to work with protective low voltage.
  • the arrangement according to the invention for solving this problem is characterized in that the sensor can be operated at a higher-frequency operating point which is above normal operation, and in that the sensor is designed as a mains voltage-isolating, capacitive series circuit which is dimensioned for mains voltage contact protection.
  • An advantageous embodiment of the invention is characterized in that the arrangement-related capacitive series connection consists of three dielectrics, which are surrounded by metallizations. Further advantageous embodiments of the invention are contained in the subclaims.
  • FIG. 1 a glass ceramic cooktop 1, a metallic sensor 2, insulating dielectric layers 3 and a radiant heater 4 can be seen.
  • This sensor arrangement acts as a capacitive and temperature-dependent indicator as a result of changes in capacitance due to materials on the glass ceramic or via the loss factor delta as a function of the time of the glass ceramic.
  • the sensor created in this way is at the same time isolating the supply voltage from the metalization 2 as an insulation layer.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Insulators (AREA)
  • Glass Compositions (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention relates to mains voltage insulation for sensors under glass-ceramic cooking surfaces, a metallic sensor (2) being arranged under a glass-ceramic cooking surface (1) inside or outside the heating region, which is governed by a radiating heating element (4), of the glass-ceramic cooking surface (1), so that the sensor (2) can be driven at a higher-frequency operating point, above the normal mode, and the sensor (2) is designed as a capacitive series circuit, which provides insulation from the mains voltage and is dimensioned for protection against touching the mains voltage. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Netzspannungsisolierung für Sensoren unter Glaskeramik-Kochflächen, wobei ein metallischer Sensor unter einer Glaskeramik-Kochfläche innerhalb oder außerhalb des durch einen Strahlungsheizkörper bedingten Heißbereiches der Glaskeramik-Kochfläche angeordnet ist.The invention relates to a mains voltage insulation for sensors under glass ceramic cooktops, wherein a metallic sensor is arranged under a glass ceramic cooktop inside or outside the hot area of the glass ceramic cooktop caused by a radiant heater.

Bislang wurde für Glaskeramik-Kochflächen eine Temperaturabschaltung, die zum Schutz erhitzter Glaskeramikflächen diente, sensormäßig durchgeführt. Dabei war eine Anbringung von Temperatursensoren in Umgebung des Heißbereiches der Glaskeramik-Kochfläche nicht erforderlich. Die Anwendung metallischer Sensoren, beispielsweise zur Topferkennung, wobei die metallischen Sensoren unterhalb der Glaskeramik angeordnet sind, ist bislang nicht erfolgt. Da die Glaskeramik bei höheren Temperaturen, etwa ab 200°C, halbleitend wird, gelten Sensoren unter dem Heißbereich der Glaskeramik-Kochfläche als berührbar. Es ist deshalb üblich, daß beim Betrieb solcher Sensoranordnungen mit einer Schutz-Kleinspannung gearbeitet wird. Für diesen Betriebsfall ist infolge aufwendiger Leitungsisolierungen erheblicher Platzbedarf unterhalb der Glaskeramik-Kochfläche notwendig.So far, a temperature switch-off, which was used to protect heated glass ceramic surfaces, has been carried out for glass ceramic cooktops. It was not necessary to attach temperature sensors in the vicinity of the hot area of the glass ceramic cooktop. The use of metallic sensors, for example for pot detection, wherein the metallic sensors are arranged below the glass ceramic, has not yet taken place. Since the glass ceramic becomes semiconducting at higher temperatures, for example from 200 ° C, sensors under the hot area of the glass ceramic cooking surface are considered to be touchable. It is therefore customary to work with a protective low voltage when operating such sensor arrangements becomes. For this type of operation, considerable space is required below the glass ceramic cooktop as a result of complex cable insulation.

Aufgabe der Erfindung ist es daher, metallische Sensoren unterhalb der Glaskeramik-Kochfläche in deren Heißbereich betreiben zu können, ohne mit Schutz-Kleinspannung arbeiten zu müssen.The object of the invention is therefore to be able to operate metallic sensors below the glass ceramic cooktop in the hot area thereof without having to work with protective low voltage.

Die erfindungsgemäße Anordnung zur Lösung dieser Aufgabe ist dadurch gekennzeichnet, daß der Sensor bei einem über dem Normalbetrieb liegenden, höherfrequenten Arbeitspunkt betreibbar ist, und daß der Sensor als netzspannungsisolierende, kapazitive Reihenschaltung, die für Netzspannungs-Berührungsschutz dimensioniert ist, ausgeführt ist. Eine vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß die anordnungsbedingte kapazitive Reihenschaltung aus drei Dielektriken, die von Metallisierungen eingefaßt sind, besteht. Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen enthalten.The arrangement according to the invention for solving this problem is characterized in that the sensor can be operated at a higher-frequency operating point which is above normal operation, and in that the sensor is designed as a mains voltage-isolating, capacitive series circuit which is dimensioned for mains voltage contact protection. An advantageous embodiment of the invention is characterized in that the arrangement-related capacitive series connection consists of three dielectrics, which are surrounded by metallizations. Further advantageous embodiments of the invention are contained in the subclaims.

Ein Ausführungsbeispiel nach der Erfindung ist in folgenden anhand der Zeichnung näher beschrieben. Es zeigt:

Fig. 1
eine Sensoranordnung unter einer Glaskeramik-Kochfläche,
Fig. 2a, b)
tiefe Ersatzschaltung der Sensoranordnung.
An embodiment according to the invention is described in more detail below with reference to the drawing. It shows:
Fig. 1
a sensor arrangement under a glass ceramic cooktop,
2a, b)
deep equivalent circuit of the sensor arrangement.

Gemäß Fig. 1 ist eine Glaskeramik-Kochfläche 1, ein metallischer Sensor 2, isolierende dielektrische Schichten 3 und ein Strahlungsheizkörper 4 erkennbar. Gemäß Fig. 2a, b) ist eine als Ersatzschaltung den Sachverhalt nach Fig. 1 darstellende Anordnung erkennbar. Dabei handelt es sich um die Dielektrika-Folge als die der Sensor 2 aufgebaut ist. Elektrostatisch stellt der Sensor eine netzspannungsisolierende kapazitive Reihenschaltung dar, die so dimensioniert ist, daß sie einen Netzspannungs-Berührungsschutz abgibt. Als Isolations- und Dielektrikamaterial wird Mikanit verwendet, wobei die anordnungsbedingt Dielektrika-Folge dann durch eine Mikanitschicht mit nachfolgender Glaskeramikschicht und eine gleiche Mikanitschicht ausgeführt ist. Diese Sensoranordnung, unter Einbeziehung der Glaskeramik-Kochfläche, wirkt infolge von Kapazitatsänderungen durch Materialien auf der Glaskeramik oder über den Verlustfaktor Delta als Funktion der Zeit der Glaskeramik als kapazitiver und temperaturabhängiger Indikator. Dabei ist der so erstellte Sensor gleichzeitig als Isolationsschicht gegenüber der Metalisierung 2 netzspannungsisolierend.1, a glass ceramic cooktop 1, a metallic sensor 2, insulating dielectric layers 3 and a radiant heater 4 can be seen. 2a, b) an arrangement representing the situation according to FIG. 1 as an equivalent circuit. This is the dielectric sequence in which the sensor 2 is constructed. Electrostatically, the sensor represents a mains voltage isolating capacitive series circuit, which is dimensioned so that it provides a mains voltage protection against contact. Micanite is used as the insulation and dielectric material, the arrangement-related dielectric sequence then being carried out by a micanite layer with a subsequent glass ceramic layer and an identical micanite layer. This sensor arrangement, including the glass ceramic cooking surface, acts as a capacitive and temperature-dependent indicator as a result of changes in capacitance due to materials on the glass ceramic or via the loss factor delta as a function of the time of the glass ceramic. The sensor created in this way is at the same time isolating the supply voltage from the metalization 2 as an insulation layer.

Eine Optimierung solcher Sensoranordnungen hängt von der Temperaturverträglichkeit der Isolationsschicht ab, da dies die Einbaunähe zum Heißbereich der Glaskeramik-Kochfläche entscheidend beeinflußt. Die Grenzen dieser Anordnung bezüglich der Sensortauglichkeit ist daher von der Temperaturverträglichkeit solcher Anordnungen entscheidend geprägt.Optimization of such sensor arrangements depends on the temperature compatibility of the insulation layer, since this has a decisive influence on the proximity to the hot area of the glass ceramic cooktop. The limits of this arrangement with regard to sensor suitability are therefore decisively influenced by the temperature tolerance of such arrangements.

Claims (4)

Netzspannungsisolierung für Sensoren unter Glaskeramik-Kochflächen, wobei ein metallischser Sensor (2) unter einer Glaskeramik-Kochfläche (1) innerhalb oder außerhalb des durch einen Strahlungsheizkörper (4) bedingten Heißbereiches der Glaskeramik-Kochfläche (1) angeordnet ist, dadurch gekennzeichnet, daß der Sensor (2) einem über dem Normalbetrieb liegenden, höherfrequenten Arbeitspunkt betreibbar ist, und daß der Sensor (2) als netzspannungsisolierende, kapazitive Reihenschaltung, die für Netzspannungsberührungsschutz dimensioniert ist, ausgeführt ist.Mains voltage insulation for sensors under glass ceramic cooktop, a metallic sensor (2) being arranged under a glass ceramic cooktop (1) inside or outside the hot area of the glass ceramic cooktop (1) caused by a radiant heater (4), characterized in that the sensor (2) can be operated at a higher-frequency operating point that is above normal operation, and that the sensor (2) is designed as a line voltage-isolating, capacitive series circuit which is dimensioned for line voltage protection. Netzspannungsisolierung nach Anspruch 1, dadurch gekennzeichnet, daß die anordnungsbedingte, kapazitive Reihenschaltung aus drei Dielektriken, die von Metallisierungen eingefaßt sind, besteht.Mains voltage insulation according to claim 1, characterized in that the arrangement-related, capacitive series connection consists of three dielectrics, which are surrounded by metallizations. Netzspannungsisolierung nach Anspruch 1 und 4, dadurch gekennzeichnet, daß die Dielektriken durch Isolationsmittel (3) und die Glaskeramik-Kochfläche (1) gebildet werden.Mains voltage insulation according to Claims 1 and 4, characterized in that the dielectrics are formed by insulation means (3) and the glass ceramic cooking surface (1). Netzspannungsisolierung nach Anspruch 1 und 3, dadurch gekennzeichnet, daß als Isolationsmittel (3) Mikanit verwendet ist.Mains voltage insulation according to Claims 1 and 3, characterized in that micanite is used as the insulation means (3).
EP92110533A 1991-06-28 1992-06-23 Supply voltage isolation with sensors below glass-ceramic cooking hob plates. Expired - Lifetime EP0522345B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9108013U DE9108013U1 (en) 1991-06-28 1991-06-28 Mains voltage insulation for sensors under glass ceramic cooking surfaces
DE9108013U 1991-06-28

Publications (2)

Publication Number Publication Date
EP0522345A1 true EP0522345A1 (en) 1993-01-13
EP0522345B1 EP0522345B1 (en) 1995-08-23

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EP92110533A Expired - Lifetime EP0522345B1 (en) 1991-06-28 1992-06-23 Supply voltage isolation with sensors below glass-ceramic cooking hob plates.

Country Status (4)

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EP (1) EP0522345B1 (en)
AT (1) ATE126876T1 (en)
DE (2) DE9108013U1 (en)
ES (1) ES2078593T3 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0639743A2 (en) * 1993-08-18 1995-02-22 Bosch-Siemens HausgerÀ¤te GmbH Cooking top
GB2414559A (en) * 2004-05-26 2005-11-30 Ceramaspeed Ltd Cooker plate temperature sensing assembly with an electrically insulating layer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES1231039Y (en) 2019-05-03 2019-09-09 Eika S Coop RADIANT DEVICE

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0288915A2 (en) * 1987-05-01 1988-11-02 E.G.O. Elektro-Geräte Blanc u. Fischer Electric radiant heating element for heating a plate, in particular a glass-ceramic plate

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0288915A2 (en) * 1987-05-01 1988-11-02 E.G.O. Elektro-Geräte Blanc u. Fischer Electric radiant heating element for heating a plate, in particular a glass-ceramic plate

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0639743A2 (en) * 1993-08-18 1995-02-22 Bosch-Siemens HausgerÀ¤te GmbH Cooking top
EP0639743A3 (en) * 1993-08-18 1998-11-25 BSH Bosch und Siemens Hausgeräte GmbH Cooking top
GB2414559A (en) * 2004-05-26 2005-11-30 Ceramaspeed Ltd Cooker plate temperature sensing assembly with an electrically insulating layer
GB2414559B (en) * 2004-05-26 2007-08-08 Ceramaspeed Ltd Temperature sensor assembly

Also Published As

Publication number Publication date
ES2078593T3 (en) 1995-12-16
EP0522345B1 (en) 1995-08-23
DE59203358D1 (en) 1995-09-28
ATE126876T1 (en) 1995-09-15
DE9108013U1 (en) 1991-09-05

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