EP2082467A1 - Procede pour la protection d'un element chauffant ainsi que dispositif de chauffage - Google Patents

Procede pour la protection d'un element chauffant ainsi que dispositif de chauffage

Info

Publication number
EP2082467A1
EP2082467A1 EP07821443A EP07821443A EP2082467A1 EP 2082467 A1 EP2082467 A1 EP 2082467A1 EP 07821443 A EP07821443 A EP 07821443A EP 07821443 A EP07821443 A EP 07821443A EP 2082467 A1 EP2082467 A1 EP 2082467A1
Authority
EP
European Patent Office
Prior art keywords
heating element
voltage
limit value
heating
heating device
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Withdrawn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
EP07821443A
Other languages
German (de)
English (en)
Inventor
Michael Georg Rosenbauer
Peter Schweier
Franz-Josef Wagner
Christian Wirth
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete 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 BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP2082467A1 publication Critical patent/EP2082467A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • H02H5/042—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using temperature dependent resistors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
    • 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
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • 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
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0258—For cooking
    • H05B1/0269—For heating of fluids
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00—Cooking-vessels
    • A47J27/21—Water-boiling vessels, e.g. kettles
    • A47J27/21008—Water-boiling vessels, e.g. kettles electrically heated
    • A47J27/21058—Control devices to avoid overheating, i.e. "dry" boiling, or to detect boiling of the water
    • A47J27/21091—Control devices to avoid overheating, i.e. "dry" boiling, or to detect boiling of the water of electronic type

Definitions

  • the invention relates to a method for protecting a heating element with at least one voltage tap against overheating. Furthermore, the invention relates to a heating device and a water-conducting household appliance with such a heater.
  • Heaters with an electrically operated resistance heating element require protection against overheating, especially when used in water-bearing domestic appliances, such as e.g. Kettle, coffee machines, dishwashers or washing machines are used.
  • To protect against overheating is provided that during heating operation by measuring the heating current and - voltage of the heater resistance is determined and a shutdown of the heating takes place when a fixed limit is exceeded.
  • this requires a very accurate and long-term stable measurement of heating current and voltage.
  • the heating resistors used for the production may have only a small specimen scattering in order to realize a current measuring device with the required accuracy.
  • problematic are critical partial overheating with relatively small area expansion, which can also lead to destruction of the heating element. You can not be distinguished from uncritical, large-scale warming.
  • the object of the invention is achieved by a method for protecting a heating element with at least one voltage tap against overheating, with the following steps: - determining a heater element limit,
  • the method according to the invention uses, by means of a heating element with at least one voltage tap, further characteristic values of the heating element to be detected and used for the evaluation.
  • the detection of the heating element value and of the at least one voltage pick-off value which takes place continuously or at a predetermined sampling frequency, allows even partial overheating to be reliably detected. Furthermore, the method eliminates the influence of specimen scattering.
  • At least one resistance value is used to determine the limit value.
  • This may be the resistance value of the heating element, which is determined by means of a monitoring device from the electric current flowing through the heating element and the voltage drop across the heating element. This resistance value is then monitored and compared with the previously determined and stored Schutgrenzwert continuously or at a predetermined sampling frequency during operation, wherein when the determined Schuelementgrenzives exceeds the heating element is deactivated.
  • the conductance may be used instead of using a resistance value.
  • At least one stress ratio is used for determining the limit value.
  • the voltage ratio is the ratio of the voltage drop across the at least one voltage tap and the voltage drop across the heating element. If a plurality of voltage taps are provided on the heating element, a corresponding number of voltage ratios in relation to the voltage drop at the heating element are determined in accordance with the number of voltage taps.
  • the respective voltages dropping across the voltage taps are detected by means of the Monitoring devices detected continuously or at a predetermined sampling frequency and compared with predetermined voltage tap limit values. As soon as a value exceeds a predetermined voltage tap limit, the heating element is deactivated.
  • the heater takes place in an initialization step. That is, the heater is heated in the new state in the manufacturing during the initialization step and a self-adjustment takes place, in which the electrical current through the heating element, the voltage drop across the heating element and the voltage drops across the voltage drops detected electrical voltages.
  • the values determined from these measured values become the corresponding limit values, i. the Schuelementgrenzwert and the at least onechrosabgriffsgrenzwert, formed and stored. In this case, a multiplication with a correction factor can be provided to increase the security.
  • the monitoring device is switched to a monitoring mode in which only a continuous or with a predetermined sampling frequency detecting the Schuelementgrenzwertsund the at least onedersabgriffgrenzhongs and if a limit value is exceeded deactivating the heating element takes place.
  • the invention includes a heating device, at least comprising a heating element with at least one voltage tap and with a monitoring device for
  • the heating device is deactivated. This device allows it in a simple way
  • the at least one predetermined limit value is a resistance value which is detected by means of a current and voltage measurement.
  • This may be, for example, the heating element limit value of the heating element of the heating device.
  • the corresponding conductance can also be used.
  • the at least one predetermined limit value is a voltage ratio that is formed from the electrical voltage falling on the heating element and the voltage drop across the at least one voltage tap.
  • the predefined limit value may, for example, be the at least one voltage threshold limit value.
  • the heating device has current measuring means for detecting the electric current flowing through the heating element so as to determine the resistance value of the heating element.
  • the current measurement is done by measuring a voltage drop via a shunt resistor.
  • the monitoring device has a memory in which the at least one predetermined limit value can be stored.
  • a memory in which the at least one predetermined limit value can be stored.
  • This allows, in an initialization process e.g. to detect a Schuelementgrenzwert and at least onepalsabgriffgrenzwert and to determine therefrom the respective limits, which can then be stored in the memory.
  • a microcontroller of a monitoring device After completion of the initialization process, a microcontroller of a monitoring device then has access to the stored limit value in order to be able to compare it with the heating element values detected continuously or at a predetermined sampling frequency and the at least one voltage tap value.
  • the invention includes a water-conducting household appliance, such. a kettle, a coffee machine, a dishwasher or a washing machine, which has at least one heating device according to the invention.
  • Fig. 1 is a schematic representation of a heating device according to the invention.
  • the heating device 2 has a heating element 4, which is an electric heating element in thick-film technology with a substantially elongated shape.
  • the heating element 4 has two voltage taps 6 in the present exemplary embodiment. Alternatively, however, a different number of voltage taps may be provided.
  • the heating device 2 has a connection 22 for supplying electrical energy, which flows through the heating element 4 when the relay switch 16 is closed.
  • a shunt resistor 10 is arranged, which serves to measure the current flowing through the heating element 4 electrical current.
  • the heater 2 includes a transducer unit 12, which serves to adapt the input voltage of the heating element 4, the voltage drop across the shunt resistor 10 and the voltage drops across the voltage taps 6.
  • the heating device 2 comprises a monitoring device 8, which has a microcontroller (not shown) and a memory (not shown).
  • the microcontroller is connected on the input side to the voltage converter unit 8 and is on the output side with a relay 14 in operative connection.
  • the monitoring device 8 is connected to a reference voltage source 20.
  • the voltage drop across the heating element 4 and the electrical current flowing through the heating element 4 is detected by means of the shunt resistor 10.
  • These values are adjusted by the transducer unit 12 of the monitoring device 8 with the microcontroller fed and determined from a limit value for the resistance value.
  • the metrologically determined limit value can be multiplied by a predetermined correction factor become. This value is then stored in memory as a predetermined Schuelementgrenzwert.
  • the values for the voltage drops at the voltage taps 6 are detected, adjusted by means of the transducer unit 12 and supplied to the monitoring unit 8 with the microcontroller. Subsequently, a voltage ratio based on the voltage drop across the heating element 4 is determined for each voltage tap 6 and stored in the memory asppsabgriffsgrenzhong, where also a multiplication with a predetermined correction factor can be provided. In addition, it is possible for the voltage ratio of the two voltage taps 6 to be formed and stored as a further limit value. This completes the initialization process.
  • the heating device 2 is again supplied with a voltage source connected to the terminal 22 with electrical energy, which causes a flowing through the heating element electrical current when the relay switch 16 is closed, which causes heating of the heating element 4.
  • the current flowing through the heating element 4 is detected by means of the shunt resistor 10 and the voltage drop across the heating element 4 by means of the transducer unit 12 and the monitoring device 8.
  • the actual resistance value is determined from the electric current flowing through the heating element 4 and the voltage dropping across the heating element 4, which current value is compared with the heating element limit value determined and stored during the initialization step. If the current resistance value is greater than the predetermined heating element limit value, the monitoring device causes the relay 14 to be de-energized so that the relay switch 16 opens, thereby disconnecting the heating element 4 from the power supply.
  • the voltage drops at the voltage taps 6 are detected continuously and at a predetermined sampling ratio, and the ratios of the voltages at the voltage taps 6 to the voltage drop across the heating element 4 are formed. In addition, the ratios of the two voltages at the voltage taps 6 can be formed. These are stored with the predetermined voltage tap limits compared. If one of the currentmatsabgriffsgrenzowski exceeds the correspondingchrosabgriffswert, causes the analog monitoring device 8 that the relay 14 is no longer flowed through by an electric current, so that the relay switch 16 opens and the heating resistor 4 disconnects from the power supply.
  • the heating device according to the invention allows reliable protection of the heating element against overheating.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Resistance Heating (AREA)

Abstract

L'invention concerne un procédé pour la protection d'un élément chauffant (4) doté d'au moins une prise de tension (6) contre la surchauffe, comprenant les étapes suivantes : détermination d'une valeur de seuil d'élément chauffant, détermination d'au moins une valeur de seuil de prise de tension, enregistrement de la valeur d'élément chauffant (4) et de la ou les valeur(s) de prise de tension, et désactivation de l'élément chauffant (4) lorsque la valeur de seuil d'élément chauffant ou la ou les valeurs de seuil de prise de tension est dépassée. L'invention concerne en outre un dispositif de chauffage (2) ainsi qu'un appareil à usage domestique utilisant de l'eau équipé d'un tel dispositif de chauffage (2).
EP07821443A 2006-10-19 2007-10-17 Procede pour la protection d'un element chauffant ainsi que dispositif de chauffage Withdrawn EP2082467A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006049395A DE102006049395A1 (de) 2006-10-19 2006-10-19 Verfahren zum Schutz eines Heizelementes sowie Heizvorrichtung
PCT/EP2007/061078 WO2008046852A1 (fr) 2006-10-19 2007-10-17 Procédé pour la protection d'un élément chauffant ainsi que dispositif de chauffage

Publications (1)

Publication Number Publication Date
EP2082467A1 true EP2082467A1 (fr) 2009-07-29

Family

ID=38721196

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07821443A Withdrawn EP2082467A1 (fr) 2006-10-19 2007-10-17 Procede pour la protection d'un element chauffant ainsi que dispositif de chauffage

Country Status (6)

Country Link
US (1) US20100018963A1 (fr)
EP (1) EP2082467A1 (fr)
KR (1) KR20090074189A (fr)
CN (1) CN101529684B (fr)
DE (1) DE102006049395A1 (fr)
WO (1) WO2008046852A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2464533A (en) * 2008-05-15 2010-04-28 Vladimir Davidov Safe planar electrical heater
DE102013200277A1 (de) 2013-01-10 2014-01-30 E.G.O. Elektro-Gerätebau GmbH Heizeinrichtung und Verfahren zur Temperaturmessung an der Heizeinrichtung
JP2015060740A (ja) * 2013-09-19 2015-03-30 株式会社東芝 照明装置
US20170049296A1 (en) * 2015-08-18 2017-02-23 General Electric Company Controlling the operation of a dishwashing appliance
DE102016216295A1 (de) * 2016-08-30 2018-03-01 Dbk David + Baader Gmbh Elektrischer heizer und verfahren zum erkennen einer überhitzung eines solchen elektrischen heizers
ES2927247T3 (es) 2018-01-17 2022-11-03 Vorwerk Co Interholding Procedimiento para hacer funcionar un elemento calentador
PT3808235T (pt) * 2019-10-15 2023-04-04 Vorwerk Co Interholding Processo de operação de um sistema de aquecimento e máquina de cozinha
CN111671371B (zh) * 2020-06-18 2022-06-14 上海明略人工智能(集团)有限公司 洗碗机的加热模式的确定方法和装置、存储介质

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Publication number Priority date Publication date Assignee Title
US4511791A (en) * 1983-04-25 1985-04-16 Owens-Corning Fiberglas Corporation Electronic balance meter
DE3718809A1 (de) * 1987-06-05 1988-12-15 Memmert Gmbh & Co Kg Waerme Me Verfahren zur temperaturregelung und temperaturregelschaltung
IT1259221B (it) * 1992-07-23 1996-03-11 Zanussi Elettrodomestici Macchina lavatrice con dispositivo di controllo della temperatura degli organi elettrici di riscaldamento dell'acqua
DE19835622A1 (de) * 1998-08-06 2000-02-10 Bsh Bosch Siemens Hausgeraete Haushaltgerät
DE50304818D1 (de) * 2002-06-12 2006-10-12 Ig Bauerhin Gmbh Überwachungsvorrichtung für in Serie geschaltete elektrische Heizelemente
DE10360553A1 (de) * 2003-12-22 2005-07-14 BSH Bosch und Siemens Hausgeräte GmbH Stromsensor zur Überwachung vor Überhitzung von Heizelementen
US7256371B2 (en) * 2004-03-22 2007-08-14 Integrated Electronic Solutions Pty Ltd. Temperature control method for positive temperature coefficient type heating element

Non-Patent Citations (1)

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Title
See references of WO2008046852A1 *

Also Published As

Publication number Publication date
DE102006049395A1 (de) 2008-04-24
WO2008046852A1 (fr) 2008-04-24
US20100018963A1 (en) 2010-01-28
CN101529684B (zh) 2011-12-07
KR20090074189A (ko) 2009-07-06
CN101529684A (zh) 2009-09-09

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