EP0789504A2 - Dispositif de mesure de la température pour le circuit de contrÔle d'un radiateur électrique - Google Patents

Dispositif de mesure de la température pour le circuit de contrÔle d'un radiateur électrique Download PDF

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Publication number
EP0789504A2
EP0789504A2 EP97101687A EP97101687A EP0789504A2 EP 0789504 A2 EP0789504 A2 EP 0789504A2 EP 97101687 A EP97101687 A EP 97101687A EP 97101687 A EP97101687 A EP 97101687A EP 0789504 A2 EP0789504 A2 EP 0789504A2
Authority
EP
European Patent Office
Prior art keywords
heating conductor
temperature
measuring device
resistance
control circuit
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.)
Withdrawn
Application number
EP97101687A
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German (de)
English (en)
Other versions
EP0789504A3 (fr
Inventor
Roman-Hartmut Wauer
Berndt Gierer
Pia Krause
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
AKO Werke GmbH 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.)
Filing date
Publication date
Application filed by AKO Werke GmbH and Co KG filed Critical AKO Werke GmbH and Co KG
Publication of EP0789504A2 publication Critical patent/EP0789504A2/fr
Publication of EP0789504A3 publication Critical patent/EP0789504A3/fr
Withdrawn legal-status Critical Current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
    • H05B2213/07—Heating plates with temperature control means

Definitions

  • the invention relates to a temperature measuring device for a control circuit, in particular an electric radiant heater with a heating conductor arranged below a glass ceramic cooktop.
  • DE 31 00 758 A1 describes a switching device for cooking appliances with a glass ceramic plate, a mechanical expansion element being arranged as a temperature sensor between the glass ceramic plate and a heating conductor.
  • a switching contact coupled to the expansion element, the heating conductor is switched off when a target temperature is reached and switched on again with a certain hysteresis.
  • a temperature controller for electric hot plates with a hydraulic temperature sensor is known from DE 28 50 389 B2.
  • a temperature control for electrical surface heating is known.
  • a heat-sensitive element is arranged between the heating element and a temperature sensor electrode.
  • additional elements namely the temperature sensor electrode and the heat-sensitive element, are also required for temperature detection.
  • the object of the invention is to propose a temperature measuring device of the type mentioned, in which the heating conductor itself is sufficient for the temperature detection.
  • the above object is achieved in a temperature measuring device of the type mentioned at the outset in that a changeover switch is provided, which connects the heating conductor cyclically to a resistance measuring circuit, which detects the respective temperature-dependent ohmic resistance value of the heating conductor and generates a temperature-proportional control signal for the control circuit.
  • heating conductor wires that can be used for radiant heating systems have known resistance characteristics or temperature coefficients. According to the invention, the respective resistance value of the heating conductor is recorded during operation and evaluated to regulate the heating power. This eliminates the need for a separate temperature sensor.
  • the heating conductor therefore has a double function, in that it heats the hob and detects its temperature on the one hand, so that the control circuit regulates the temperature of the hob to an adjustable setpoint.
  • the resistance measuring circuit only evaluates the ohmic resistance value of the heating conductor after a cooling time as a control signal for the control circuit, the cooling time being dimensioned such that the temperature of the heating conductor reflects the temperature of the Cooktop is.
  • the resistance measuring circuit generates a switch-off signal for the control circuit in the event of a heating conductor resistance value which occurs when the heating conductor is overheated. It is achieved in that the heating conductor can be operated up to very close to its limit temperature. This has the advantage that for the calculation of the life span of the heating conductor to be guaranteed, at most small safety reserves have to be considered. The dimensioning of the heating conductor can thus be fully utilized in operation. This switch-off signal is only effective for a short time until the temperature of the heating conductor has dropped below the excess temperature.
  • the resistance measuring circuit In order to detect faults in the heating conductor, such as a short circuit and / or an interruption in the heating conductor, the resistance measuring circuit generates a switch-off signal for the control circuit and an alarm signal if the resistance value is outside the normal operating range.
  • the temperature measuring device described can be used not only with a radiant heater, but also with other heaters in which the heating wire is in close proximity to the measuring point. Since the heating wire must be separated from the energy supply circuit to determine the ambient temperature, use is particularly possible where a large thermal mass is to be heated, as is the case, for example, with night storage heaters.
  • a heating conductor (2) is arranged at a distance in the usual manner below a hob (1) of a glass ceramic plate.
  • the heating conductor (2) forms a spiral heating coil.
  • the heating conductor (2) consists of a resistance wire with a positive temperature coefficient.
  • the heating conductor (2) is connected to an energy regulator (3) which is connected to the electrical network (4).
  • the energy regulator (3) works with an electronic load switch (5) on which the heating conductor (2) is connected via a two-pole switch (6).
  • the switch (6) is preferably formed by electronic components.
  • a resistance measuring circuit (7) is connected to the changeover switch (6), which has measuring electronics (8) and evaluation electronics (9).
  • the resistance measuring circuit (7) generates a control signal for a control circuit (10) which controls the electronic load switch (5) and the changeover switch (6).
  • a setpoint adjuster (11) is connected to the control circuit (10).
  • the heating conductor (2) is connected to the network (4) via the load switch (5) and a corresponding load current flows through it.
  • the heating conductor (2) glows and heats the cooktop (1) or a vessel standing on it by means of radiant heat.
  • the control circuit (10) switches the changeover switch (6) so that the glowing heating conductor (2) is connected to the measuring electronics (8).
  • the evaluation electronics (9) generate a corresponding temperature-proportional control signal for the control circuit (10) from the measured resistance value.
  • the resistance value is evaluated which is available immediately after the switch (6) has been switched over (cf. t1 in FIG. 2), then this corresponds to the annealing temperature (approximately 1100 ° C.) of the heating conductor (2). Evaluating this inherent resistance of the heating conductor (2) is advantageous if the circuit described is intended to prevent a maximum annealing temperature of the heating conductor (2) from being exceeded. When the maximum annealing temperature has been reached, the heating conductor (2) remains switched off from the mains (4) for a certain time.
  • the temperature of the hob (1) is to be detected.
  • the previously switched on, glowing heating conductor (2) remains switched off for a certain cooling time (t2-t1, for example about 1s) until it no longer glows or only glows dark. This is the case in the temperature range of around 750 ° C. Goes into the temperature prevailing on the heating conductor (2) now the temperature of the hob (1). Its resistance is therefore an image of the temperature of the hob (1) (cf. t2, t3 in FIG. 2).
  • the cooling time can have a fixed value.
  • the measuring time (t3-t2) is, for example, about 0.3 s. It is also possible to carry out the measurement in some points of the e-function immediately after the time (t1) and to extrapolate the further curve profile from the measured value profile and then to calculate the ambient temperature.
  • the total measuring time can be shorter than the cooling time (t2-t1). Depending on the desired accuracy, the measurement can be stopped at an earlier or later time (before t2).
  • the total cooling time (t3-t1) is significantly shorter than the cycle time specified above, after which the measurement described takes place again and again, so that the actual heating time is longer than the measuring time.
  • the control circuit (10) switches off the load switch (5) before the changeover switch (6) switches from the load switch (5) to the resistance measuring circuit (7) is switched, and only switches on the load switch (5) when after the measuring process the changeover switch (6) is switched back from the resistance measuring circuit (7) to the load switch (5).
  • the resistance measuring circuit (7) it is also possible to detect a resistance value that lies outside the normal operating range and to generate a switch-off signal for the control circuit (10) and an alarm signal.
  • a resistance value outside the normal operating range is, for example, a short circuit and / or an interruption in the heating conductor (2).
  • a resistance value which is not customary in operation is also one which is substantially smaller than the resistance value occurring at room temperature and / or which is significantly greater than the resistance value occurring at the maximum annealing temperature.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Control Of Resistance Heating (AREA)
EP97101687A 1996-02-09 1997-02-04 Dispositif de mesure de la température pour le circuit de contrÔle d'un radiateur électrique Withdrawn EP0789504A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19604658A DE19604658A1 (de) 1996-02-09 1996-02-09 Temperaturmeßeinrichtung für eine Regelschaltung eines elektrischen Strahlungsheizgeräts
DE19604658 1996-02-09

Publications (2)

Publication Number Publication Date
EP0789504A2 true EP0789504A2 (fr) 1997-08-13
EP0789504A3 EP0789504A3 (fr) 1998-01-14

Family

ID=7784903

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97101687A Withdrawn EP0789504A3 (fr) 1996-02-09 1997-02-04 Dispositif de mesure de la température pour le circuit de contrÔle d'un radiateur électrique

Country Status (3)

Country Link
US (1) US5951897A (fr)
EP (1) EP0789504A3 (fr)
DE (1) DE19604658A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10104787A1 (de) * 2001-01-29 2002-08-22 Ego Elektro Geraetebau Gmbh Verfahren zur Beheizung einer Kochplatte und Kochplatte

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DE19813996A1 (de) * 1998-03-28 1999-10-07 Aeg Hausgeraete Gmbh Gareinrichtung mit einer Struktur zur Induktionsbeheizung und Widerstandsbeheizung
DE19835622A1 (de) * 1998-08-06 2000-02-10 Bsh Bosch Siemens Hausgeraete Haushaltgerät
IT1313951B1 (it) * 1999-12-16 2002-09-26 Whirlpool Co Metodo e dispositivo per rilevare il surriscaldamento di uncontenitore posto su un piano di cottura in vetroceramica durante la
TW552669B (en) * 2000-06-19 2003-09-11 Infineon Technologies Corp Process for etching polysilicon gate stacks with raised shallow trench isolation structures
DE10048181B4 (de) * 2000-09-28 2011-08-11 Gustav Magenwirth GmbH & Co. KG, 72574 Fahrzeug mit einem beheizbaren Gasdrehgriff
DE10120098B4 (de) * 2001-04-25 2004-02-05 Brose Fahrzeugteile Gmbh & Co. Kg Heizung und Verfahren zur Steuerung einer Heizung einer Funktionseinheit eines Kraftfahrzeuges
GB0115831D0 (en) * 2001-06-28 2001-08-22 Ceramaspeed Ltd Radiant electric heater
DE10156037A1 (de) * 2001-11-15 2003-06-05 Behr Hella Thermocontrol Gmbh Verfahren zur Funktionsüberwachung eines elektrischen Heizelements einer Kfz-Zusatzheizung
GB0206069D0 (en) * 2002-03-15 2002-04-24 Ceramaspeed Ltd Electrical heating assembly
DE20304149U1 (de) 2003-03-15 2003-05-22 Theben AG, 72401 Haigerloch Raumthermostat für eine elektrische Fußbodenheizung
DE102004014024B4 (de) * 2003-03-24 2006-01-26 Stiebel Eltron Gmbh & Co. Kg Verfahren und Einrichtung zur Verkalkungserkennung eines elektrischen Heizkörpers
DE102004059159A1 (de) * 2004-12-08 2006-06-14 BSH Bosch und Siemens Hausgeräte GmbH Kochfeld
DE102006022327A1 (de) * 2006-05-12 2007-11-15 BSH Bosch und Siemens Hausgeräte GmbH Vorrichtung und Verfahren zur Steuerung und/oder Regelung einer Heizleistung eines Heizelements einer Kochmulde
DE102006032698A1 (de) * 2006-07-14 2008-01-24 Bleckmann Gmbh & Co. Kg Vorrichtung und Verfahren zur Steuerung und Absicherung eines Heizelements
DE102007040891A1 (de) * 2007-08-24 2009-04-30 E.G.O. Elektro-Gerätebau GmbH Heizeinrichtung, Verfahren zum Betrieb einer Heizeinrichtung und Elektrowärmegerät mit einer solchen Heizeinrichtung
US20180051888A1 (en) * 2016-08-22 2018-02-22 Haier Us Appliance Solutions, Inc. Oven appliance surface element with no onboard sensor

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DE2936890A1 (de) 1978-09-15 1980-03-27 Matsushita Electric Works Ltd Temperaturregelung fuer elektrische oberflaechenheizung
DE2850389B2 (de) 1978-11-21 1980-12-04 E.G.O. Regeltechnik Gmbh, 6833 Waghaeusel Temperaturregler für Elektrowärmegeräte, insbesondere für Elektrokochplatten
DE3100758A1 (de) 1981-01-13 1982-09-02 Ako Werke Gmbh & Co Schalteinrichtung

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DE2936890A1 (de) 1978-09-15 1980-03-27 Matsushita Electric Works Ltd Temperaturregelung fuer elektrische oberflaechenheizung
DE2850389B2 (de) 1978-11-21 1980-12-04 E.G.O. Regeltechnik Gmbh, 6833 Waghaeusel Temperaturregler für Elektrowärmegeräte, insbesondere für Elektrokochplatten
DE3100758A1 (de) 1981-01-13 1982-09-02 Ako Werke Gmbh & Co Schalteinrichtung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10104787A1 (de) * 2001-01-29 2002-08-22 Ego Elektro Geraetebau Gmbh Verfahren zur Beheizung einer Kochplatte und Kochplatte
DE10104787B4 (de) * 2001-01-29 2006-01-26 E.G.O. Elektro-Gerätebau GmbH Verfahren zur Beheizung einer Kochplatte

Also Published As

Publication number Publication date
EP0789504A3 (fr) 1998-01-14
DE19604658A1 (de) 1997-08-14
US5951897A (en) 1999-09-14

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