EP0520213A1 - Mains shock protection for sensors under glass ceramic hob - Google Patents

Mains shock protection for sensors under glass ceramic hob Download PDF

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Publication number
EP0520213A1
EP0520213A1 EP92109286A EP92109286A EP0520213A1 EP 0520213 A1 EP0520213 A1 EP 0520213A1 EP 92109286 A EP92109286 A EP 92109286A EP 92109286 A EP92109286 A EP 92109286A EP 0520213 A1 EP0520213 A1 EP 0520213A1
Authority
EP
European Patent Office
Prior art keywords
glass ceramic
sensor
mains voltage
mains
contact protection
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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
EP92109286A
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German (de)
French (fr)
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EP0520213B1 (en
Inventor
Manfred Dipl.-Ing. Plankl
Günther Dipl.-Ing.(FH) Wittauer
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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 contact protection for sensors under glass ceramic cooktops, a metallic sensor being 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 connected to a blocking filter which is dimensioned for mains voltage contact protection.
  • Advantageous embodiments of the invention are contained in the subclaims.
  • the glass ceramic cooktop 1 and sensors 2 arranged below it can be seen.
  • the radiant heaters not shown, which due to reduced thermal conductivity in the transverse direction of the glass ceramic cooktop also result in hot areas in their radiation area on the glass ceramic cooktop, increase the electrical conductivity of the glass ceramic cooktop 1 to towards the semiconductors.
  • the sensors 2 can be used for pot detection, for example, in that a pot placed or not placed on the sensor area on the glass ceramic cooktop 1 results in total capacitive changes.
  • a circuit of the sensor 2 with an oscillating circuit, consisting of a transmitter 3.1 and a capacitance 4 is shown.
  • the resonant frequency of the resonant circuit which acts as a blocking filter, is tuned to the sensor operating frequency, which is far above the mains frequency.
  • the network frequency can be derived from this low-pass filter to ground.
  • the sensor 2 is connected to an inductor (choke) 3.
  • this protective conductor choke 3 By grounding this protective conductor choke 3, impermissible voltages at sensor 2, for example the mains voltage, are derived.
  • the choke blocks for higher frequencies so that the sensor signal is not derived. This effect can be reinforced by the construction of a parallel resonant circuit, as shown in FIG. 2.
  • the notch filter is designed as a parallel resonant circuit, it is expedient to design the choke 3 as a transformer 3.1. This also simplifies the coupling and decoupling of the sensor signal.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Control Of Resistance Heating (AREA)
  • Laminated Bodies (AREA)
  • Insulators (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Surface Treatment Of Glass (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Electric Stoves And Ranges (AREA)
  • Cookers (AREA)

Abstract

The invention relates to mains-shock protection for sensors under glass-ceramic hobs, a metallic sensor (2) being arranged under a glass-ceramic hob (1) inside or outside the heating region, which is governed by a radiant heating element, of the glass-ceramic hob (1), which can be operated as a sensor (2) in the case of an operating point which is at a higher frequency than in normal operation, and the sensor (2) being connected to a blocking filter which is dimensioned for mains-shock protection. <IMAGE>

Description

Die Erfindung bezieht sich auf einen Netzspannungs-Berührungsschutz 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 contact protection for sensors under glass ceramic cooktops, a metallic sensor being 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 Vorschrift, 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 a requirement that when operating such sensor arrangements with a protective low voltage is worked. For this type of operation, considerable space is required below the glass ceramic cooktop due to the complex cable insulation.

Aufgabe der Erfindung ist es daher, metallische Sensoren unterhalb der Glaskeramik-Kochflache in deren Heißbereich betreiben zu können, ohne mit Schutz-Kleinspannung arbeiten zu müssen. 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 mit einem Sperrfilter, das für Netzspannung-Berührungsschutz dimensioniert ist, beschaltet ist. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen enthalten.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 connected to a blocking filter which is dimensioned for mains voltage contact protection. Advantageous embodiments of the invention are contained in the subclaims.

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

Fig. 1
eine prinzipielle Anordnung von Sensoren unter einer Glaskeramikfläche,
Fig. 2
eine erfindungsgemäße Beschaltung des Sensors,
Fig. 3
die Beschaltung des Sensors mit einem Tiefpaß.
An embodiment of the invention is described below with reference to the drawing. It shows:
Fig. 1
a basic arrangement of sensors under a glass ceramic surface,
Fig. 2
an inventive wiring of the sensor,
Fig. 3
the wiring of the sensor with a low pass.

Gemäß Fig. 1 ist die Glaskeramik-Kochfläche 1, sowie unter dieser angeordnete Sensoren 2 erkennbar. Die nicht dargestellten Strahlungsheizkörper, die infolge verminderter Wärmeleitfähigkeit in Querrichtung der Glaskeramik-Kochfläche Heißbereiche in ihrem Strahlungsbereich auch auf der Glaskeramik-Kochfläche zur Folge haben, erhöhen die elektrische Leitfähigkeit der Glaskeramik-Kochfläche 1 bis hin zur Halbleitung. Die Sensoren 2 können beispielsweise zur Topferkennung dienen, indem ein aufgesetzter oder nicht aufgesetzter Topf über den Sensorbereich auf der Glaskeramik-Kochfläche 1 kapazitive Gesamtänderungen zur Folge hat. Gemäß Fig. 2 ist eine Beschaltung des Sensors 2 mit einem Schwingkreis, bestehend aus einem Übertrager 3.1 und einer Kapazität 4, dargestellt. Der als Sperrfilter wirkende Schwingkreis ist in seiner Resonanzfrequenz auf die Sensor-Betriebsfrequenz, die weit oberhalb der Netzfrequenz liegt, abgestimmt. Dadurch kann die Netzfrequenz über diesen Tiefpaß nach Masse abgeleitet werden. Gemäß Fig. 3 ist der Sensor 2 mit einer Induktivität (Drossel) 3 beschaltet. Durch die Erdung über diese Schutzleiterdrossel 3 werden unzulässige Spannungen am Sensor 2, beispielsweise die Netzspannung, abgeleitet. Für höhrere Frequenzen sperrt die Drossel, so daß das Sensorsignal nicht abgeleitet wird. Dieser Effekt kann durch den Aufbau eines Parallelschwingkreises, wie er in Fig. 2 dargestellt ist, noch verstärkt werden. Für den Fall, daß das Sperrfilter als Parallelschwingkreis ausgeführt ist, ist es zweckmäßig, die Drossel 3 als Übertrager 3.1 auszuführen. Dadurch wird zugleich die Ein- und Auskopplung des Sensorsignals vereinfacht.1, the glass ceramic cooktop 1 and sensors 2 arranged below it can be seen. The radiant heaters, not shown, which due to reduced thermal conductivity in the transverse direction of the glass ceramic cooktop also result in hot areas in their radiation area on the glass ceramic cooktop, increase the electrical conductivity of the glass ceramic cooktop 1 to towards the semiconductors. The sensors 2 can be used for pot detection, for example, in that a pot placed or not placed on the sensor area on the glass ceramic cooktop 1 results in total capacitive changes. 2, a circuit of the sensor 2 with an oscillating circuit, consisting of a transmitter 3.1 and a capacitance 4, is shown. The resonant frequency of the resonant circuit, which acts as a blocking filter, is tuned to the sensor operating frequency, which is far above the mains frequency. As a result, the network frequency can be derived from this low-pass filter to ground. 3, the sensor 2 is connected to an inductor (choke) 3. By grounding this protective conductor choke 3, impermissible voltages at sensor 2, for example the mains voltage, are derived. The choke blocks for higher frequencies so that the sensor signal is not derived. This effect can be reinforced by the construction of a parallel resonant circuit, as shown in FIG. 2. In the event that the notch filter is designed as a parallel resonant circuit, it is expedient to design the choke 3 as a transformer 3.1. This also simplifies the coupling and decoupling of the sensor signal.

Claims (5)

Netzspannungs-Berührungsschutz für Sensoren unter Glaskeramik-Kochflächen, wobei ein metallischer Sensor (2) unter einer Glaskeramik-Kochfläche (1) innerhalb oder außerhalb des durch einen Strahlungsheizkörper bedingten Heißbereiches der Glaskeramik-Kochfläche (1) angeordnet ist, dadurch gekennzeichnet, daß der Sensor (2) bei einem über dem Normalbetrieb liegenden, höherfrequenten Arbeitspunkt betreibbar ist, und daß der Sensor (2) mit einem Sperrfilter, das für Netzspannungs-Berührungsschutz dimensioniert ist, beschaltet ist.Mains voltage contact protection 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, characterized in that the sensor (2) can be operated at a higher-frequency operating point which is above normal operation, and that the sensor (2) is connected to a blocking filter which is dimensioned for mains voltage contact protection. Netzspannungs-Berührungsschutz nach Anspruch 1, dadurch gekennzeichnet, daß das Sperrfilter als Tiefpaß ausgeführt ist.Mains voltage contact protection according to claim 1, characterized in that the blocking filter is designed as a low-pass filter. Netzspannungs-Berührungsschutz nach Anspruch 1, dadurch gekennzeichnet, daß der Tiefpaß durch eine geerdete Schutzleiterdrossel (3) gebildet ist.Mains voltage contact protection according to claim 1, characterized in that the low-pass filter is formed by an earthed protective conductor choke (3). Netzspannungs-Berührungsschutz nach Anspruch 1, 3, dadurch gekennzeichnet, daß das Sperrfilter durch einen auf die Sensor-Betriebsfrequenz abgestimmten Prallelschwingkreis (3.1, 4) realisiert ist.Mains voltage contact protection according to claim 1, 3, characterized in that the blocking filter is implemented by a parallel resonant circuit (3.1, 4) matched to the sensor operating frequency. Netzspannungs-Berührungsschutz nach Anspruch 1, 4, dadurch gekennzeichnet, daß die Parallel-Schwingkreisdrossel (3.1) als Übertrager ausgeführt ist.Mains voltage contact protection according to claim 1, 4, characterized in that the parallel resonant circuit choke (3.1) is designed as a transformer.
EP92109286A 1991-06-28 1992-06-02 Mains shock protection for sensors under glass ceramic hob Expired - Lifetime EP0520213B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9108012U 1991-06-28
DE9108012U DE9108012U1 (en) 1991-06-28 1991-06-28 Mains voltage contact protection for sensors under glass ceramic cooking surfaces

Publications (2)

Publication Number Publication Date
EP0520213A1 true EP0520213A1 (en) 1992-12-30
EP0520213B1 EP0520213B1 (en) 1995-08-23

Family

ID=6868789

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92109286A Expired - Lifetime EP0520213B1 (en) 1991-06-28 1992-06-02 Mains shock protection for sensors under glass ceramic hob

Country Status (5)

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US (1) US5296682A (en)
EP (1) EP0520213B1 (en)
AT (1) ATE126961T1 (en)
DE (2) DE9108012U1 (en)
ES (1) ES2078588T3 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1272028B (en) * 1993-03-15 1997-06-10 Whirlpool Italia DEVICE TO DETECT THE PRESENCE OF A FOOD CONTAINER, SUCH AS A POT, A BAKER OR SIMILAR, ON A GLASS-CERAMIC HOB.
DE19500351A1 (en) * 1995-01-07 1996-07-11 Philips Patentverwaltung Cooking utensil
GB2320626B (en) * 1996-12-19 2000-10-18 Ceramaspeed Ltd Cooking utensil detection method
US6756569B2 (en) * 2001-05-11 2004-06-29 Emerson Electric Co. Temperature sensor for heater unit in cooktop range
EP1649410A2 (en) * 2003-07-17 2006-04-26 SanDisk Corporation Memory card with raised portion
ES1135492Y (en) * 2014-12-11 2015-04-13 Eika S Coop Radiant light adapted to a cooking hob
GB2593468B (en) * 2020-03-23 2022-04-13 Equip Line Ltd An apparatus for heating a pot of food or beverage

Citations (4)

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Publication number Priority date Publication date Assignee Title
DE2831858A1 (en) * 1978-07-20 1980-02-07 Licentia Gmbh Hotplate switched on by presence of cooking utensil - measures voltage across AC-supplied capacitors and operates heating-circuit switch
EP0374868A1 (en) * 1988-12-23 1990-06-27 INDUSTRIEELEKTRONIK DR.ING. WALTER KLASCHKA GMBH &amp; CO. Cooking hob
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

Family Cites Families (8)

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US1757658A (en) * 1926-04-29 1930-05-06 Dubilier Condenser Corp Electric sadiron
US1819260A (en) * 1927-10-20 1931-08-18 Westinghouse Electric & Mfg Co Electrical control system
GB370889A (en) * 1930-05-06 1932-04-06 Process Dev Company Process for preparing carbon dioxide and siliceous materials
FR791504A (en) * 1934-09-08 1935-12-12 Mors DC device protection device
US2545760A (en) * 1948-02-17 1951-03-20 Pearl B Blanchard Protective filter condenser unit
SU491169A1 (en) * 1973-12-03 1975-11-05 High Speed Current Relay
DE3706184A1 (en) * 1987-02-26 1988-09-08 Beurer Gmbh & Co Safety circuit for electrical heating or warming apparatuses which are operated with AC voltage
DE8706277U1 (en) * 1987-05-01 1987-06-25 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Electric radiant heater for heating a plate, in particular a glass ceramic plate

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2831858A1 (en) * 1978-07-20 1980-02-07 Licentia Gmbh Hotplate switched on by presence of cooking utensil - measures voltage across AC-supplied capacitors and operates heating-circuit switch
EP0374868A1 (en) * 1988-12-23 1990-06-27 INDUSTRIEELEKTRONIK DR.ING. WALTER KLASCHKA GMBH &amp; CO. Cooking hob
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

Also Published As

Publication number Publication date
DE59203351D1 (en) 1995-09-28
US5296682A (en) 1994-03-22
ATE126961T1 (en) 1995-09-15
ES2078588T3 (en) 1995-12-16
DE9108012U1 (en) 1991-09-05
EP0520213B1 (en) 1995-08-23

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