EP1896917A1 - Dispositif de chauffage pour fluides, et appareil menager - Google Patents

Dispositif de chauffage pour fluides, et appareil menager

Info

Publication number
EP1896917A1
EP1896917A1 EP06724972A EP06724972A EP1896917A1 EP 1896917 A1 EP1896917 A1 EP 1896917A1 EP 06724972 A EP06724972 A EP 06724972A EP 06724972 A EP06724972 A EP 06724972A EP 1896917 A1 EP1896917 A1 EP 1896917A1
Authority
EP
European Patent Office
Prior art keywords
heating
heating element
heating device
switching means
temperature
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Withdrawn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
EP06724972A
Other languages
German (de)
English (en)
Inventor
Peter Schweier
Franz-Josef Wagner
Martin Stickel
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 EP1896917A1 publication Critical patent/EP1896917A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G05D23/2401—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 using a heating element as a sensing element

Definitions

  • the invention relates to a heating device for fluids, in particular for use in dishwashers, with a heating element whose resistance value is a function of its temperature and which is coupled via a switching means to a power supply, and with a protective device for protecting the heating element against overheating, which is set to operate the switching means in dependence of the temperature of the heating element.
  • the invention further relates to a domestic appliance, in particular a dishwasher with devices for washing dishes, with a heating device for heating liquid to be heated, in particular treatment liquid, for. B. rinse liquor.
  • Heating elements that are used in heaters for heating fluids can be permanently damaged in a drying cycle of the heater and the boiling over of water.
  • household appliances such as Kettles, coffee machines, dishwashers, washing machines, are used, among other things based on thick-film technology electrical resistance heaters as heating elements.
  • electrical resistance heaters as heating elements.
  • These are subject to certain security requirements. For example, there must be protection against fire, against leaks and against voltage flashovers on the heating element. In particular, voltage flashovers may not be protected by the existing building or house fuses according to a valid standard.
  • thermal circuit breakers, pressure switches, which detect the presence of a fluid, or fuses are used, which come in the case of a drying path and the resulting constant heating of the heating element to melt and separate the heating circuit.
  • the heater is configured to control the heating temperature of the heating element using a pulse-pause principle.
  • the preselection of the heating temperature is determined by a scaling means, which is designed as a voltage divider, in which a resistance is variable by a user.
  • the object of the present invention is to provide a heating device for fluids, which has a simple and inexpensive protection device for protecting a heating element of the heater from overheating. It is a further object of the present invention to provide a household appliance in which the monitoring of a heater is realized on overheating in a simple, reliable and cost-effective manner.
  • the protective device of the heating device for fluids, in particular for use in dishwashers is designed as an integrated circuit.
  • the integrated circuit is preferably designed as a microcontroller, which indirectly enables a determination and monitoring of the temperature of the heating element in a mathematical manner in order to actuate the switching means when a predetermined temperature is exceeded.
  • the departure of a discrete monitoring circuit and the replacement by an integrated circuit have the advantage of a particularly cost-effective and especially very flexible monitoring.
  • the necessary algorithms and threshold values can be stored in a memory of the integrated circuit.
  • the heater can thus be used identically in the widest variety of domestic appliances, in particular dishwashers, whereby in each case only parameters adapted to the domestic appliance need to be stored in the integrated circuit.
  • the protection device is supplied with a voltage derived from the current flowing through the heating element.
  • a current sensor means coupled to the heating element, at the output of which a current-proportional (voltage) signal flowing through the heating element can be tapped off, wherein the current sensor means is designed as a discrete component in the form of a shunt.
  • the analog signal which can be tapped off at the shunt is converted by the integrated circuit into a digital signal for further processing by means of the integrated circuit, using an analog-to-digital converter. To evaluate this signal, a comparison value is necessary, e.g. can be read from a memory of the integrated circuit.
  • the comparison value can also be supplied as a further input variable of the protective device in the form of a reference voltage.
  • a scaling means at the output of which a signal proportional to the supply voltage of the heating element can be tapped off, wherein the scaling means is designed as a discrete component in the form of a voltage divider coupled to the supply voltage.
  • the switching means for separating the heating circuit in the event of overheating is designed as a power semiconductor switch.
  • the switching means is formed together with the protective device in an integrated circuit.
  • the protection device is designed to detect a change in the resistance value of the heating element and to compare the resistance change with a reference value, preferably derived from the supply voltage, in order to be able to interrupt the heating circuit by driving the switching means when the reference value is exceeded.
  • a reference value preferably derived from the supply voltage
  • An inventive household appliance in particular dishwasher has devices for washing dishes and a heating device for heating liquid to be heated, in particular treatment liquid, for.
  • B. rinsing liquor wherein the heater comprises a formed as an integrated circuit protection device for monitoring and deactivation of the heater, in the event of exceeding a predetermined temperature value of a heating element of the heater.
  • the electronic monitoring of the heater ensures a reliable shutdown in case of overheating of the heater. In this case, operation of the dishwasher is made possible again as soon as the heating device has cooled down again.
  • the electronic monitoring makes it possible to incorporate further influencing variables for switching off the heating device.
  • a monitoring of the fill level of the rinsing liquor in the heating device can additionally be taken into account. If an electronic signal is emitted by a level gauge that the level has fallen below a predetermined value, the electronic protection device can already cause the heating device to be switched off before the critical temperature value of the heating device has been reached.
  • the household appliance comprises a heating device as described above.
  • the heating element of the heating device of the household appliance is preferably designed as a thick film heater whose resistance value is a function of its temperature. In this way, electronic monitoring can be made possible in a particularly simple manner, since the resistance value of the heating element can be calculated by the protective device.
  • the principle underlying the invention of temperature monitoring of the heater is based on the DE 103 60 553.3 of the applicant, the content of which is incorporated in the present application.
  • the computational determination of the resistance value can take place on the basis of the method described in this application. It is proposed not to resort to a direct measurement of the resistance of the heating element, but to calculate the resistance indirectly via a measurement of the current through the heating element and the voltage across the heating element. It is based on an approximation of the ratio formation (division) by a Taylor series development and terminated after the second term. The division is thus replaced by a subtraction, which is mathematically very easy to replicate.
  • the switching means 2 is controllable via a switch control circuit 3.
  • the switching means 2 may be in the form of a relay, which is turned on when the heating element 1 has not exceeded a predetermined temperature value, and is not turned on, as soon as a critical temperature value of the heating element 1 is exceeded.
  • the switching means 2 could also be in the form of a power semiconductor switch, which is integrated together with the switch control circuit 3 in an integrated circuit.
  • the switch control circuit 3 and a protective device 300 designed as an integrated circuit are supplied with a supply voltage by a power supply 200, which will not be further described below.
  • the power supply 200 basically comprises a rectifier circuit that rectifies and transposes the AC signal present at the supply terminals VA1, VA2 to a corresponding voltage level to power the switch control circuit 3 and the protection device 300.
  • the node formed between the heating element 1 and the current sensor means 4 forms an output 41 of the current sensor means 4. Between the output 41 and the supply terminal VA2 is applied to a voltage U s .
  • the output 41 is coupled to a first input 63 of the protection device 300. This is represented by a microprocessor.
  • a second input 62 of the protection device 300 is connected to a scaling means 5, which is formed by a voltage divider consisting of the resistors 51, 52. More specifically, the node 53 formed between the resistors 51, 52 is connected to the second input 62 of the protection device 300.
  • An output 106 of the protection device 300 is coupled to a control input 31 of the switch control circuit 3. Upon application of a corresponding control signal at the output 106, the switch control circuit 3 is caused to set the switching means 2 from its closed state, in which the heating element 1 is energized, to an open state to interrupt the heating circuit.
  • the heating device has the current sensor means 4 and the scaling means 5 as discrete components.
  • the at this Components which can be tapped off from components are converted in the protective device 300 into digital signals by means of analog-to-digital converters connected to the inputs 63, 62, in order to enable computational further processing of the corresponding input variables. From these, as described in the applicant's DE 103 60 553.3, a resistance value corresponding to the temperature value of the heating element 1 is compared with a reference value, the reference value being set by the scaling means 5. From the determined resistance value of the heating element 1, it can be decided whether the temperature of the heating element 1 is in a temperature range outside the specification, which is indicative of a defect of the heating device or the device in which the heating device is installed. In this case, the protection device 300 outputs a signal at its output 106, which causes the switch control circuit 3 to open the switching means 2.
  • the electronic monitoring of the temperature of the heating element 1 based on a determination of the resistance value and a mathematical evaluation of the signals obtained allows a particularly simple, inexpensive and reliable monitoring of the heater, which is particularly suitable for use in a dishwasher. This provides a particularly reliable heating device for fluids in which mechanical damage to the heating device is excluded in the case of a drying path.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Resistance Heating (AREA)
  • Washing And Drying Of Tableware (AREA)

Abstract

L'invention concerne un dispositif de chauffage pour fluides, conçu en particulier pour être utilisé dans des lave-vaisselle, comprenant un élément de chauffage (1) dont la valeur de résistance dépend de sa température, et qui est couplé avec une alimentation en courant (200) par l'intermédiaire d'un moyen de commutation (2). Le dispositif de chauffage selon l'invention comprend en outre un dispositif de protection (300) qui est destiné à protéger l'élément de chauffage contre la surchauffe, et qui est configuré pour actionner le moyen de commutation (2) en fonction de la température de l'élément de chauffage. Selon l'invention, ce dispositif de protection (300) se présente sous la forme d'un circuit intégré.
EP06724972A 2005-06-22 2006-03-08 Dispositif de chauffage pour fluides, et appareil menager Withdrawn EP1896917A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510029921 DE102005029921A1 (de) 2005-06-22 2005-06-22 Heizvorrichtung für Fluide und Haushaltsgerät
PCT/EP2006/060550 WO2006136464A1 (fr) 2005-06-22 2006-03-08 Dispositif de chauffage pour fluides, et appareil menager

Publications (1)

Publication Number Publication Date
EP1896917A1 true EP1896917A1 (fr) 2008-03-12

Family

ID=36235447

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06724972A Withdrawn EP1896917A1 (fr) 2005-06-22 2006-03-08 Dispositif de chauffage pour fluides, et appareil menager

Country Status (4)

Country Link
EP (1) EP1896917A1 (fr)
CN (2) CN2884768Y (fr)
DE (1) DE102005029921A1 (fr)
WO (1) WO2006136464A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007077170A2 (fr) * 2006-01-05 2007-07-12 Arcelik Anonim Sirketi Appareil electromenager
DE102007056917A1 (de) * 2007-11-27 2009-06-04 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Fertigungstoleranzausgleich von elektrischen Verbrauchern
ITMI20100862A1 (it) * 2010-05-14 2011-11-15 Electrolux Home Products Corporatio N N V Monitoraggio di guasti del circuito di riscaldamento di un elettrodomestico
EP2386675B1 (fr) * 2010-05-14 2014-07-16 Electrolux Home Products Corporation N.V. Circuit de chauffage avec surveillance de l'agencement pour appareil domestique
EP2386680B1 (fr) * 2010-05-14 2014-06-04 Electrolux Home Products Corporation N.V. Circuit de chauffage avec surveillance de l'agencement pour appareil domestique
DE102011108991A1 (de) 2011-08-01 2013-02-07 Florian Schilling Leitung für Fluide mit einem Heizelement und Verfahren zum Steuern eines Heizelementes zur Erwärmung einer fluidführenden Leitung
DE102012023366B4 (de) * 2012-11-29 2022-12-29 Audi Ag Verfahren für den Betrieb einer in einem Kraftfahrzeug einsetzbaren Heizung, Heizung für ein Bauteil eines Kraftfahrzeugs und Kraftfahrzeug
CN108574265A (zh) * 2017-03-13 2018-09-25 鸿富锦精密工业（深圳）有限公司 温度保护电路
CN108742414A (zh) * 2018-05-23 2018-11-06 佛山市顺德区美的洗涤电器制造有限公司 洗碗机加热保护方法、装置及计算机可读存储介质
KR102661664B1 (ko) 2019-01-10 2024-04-29 엘지전자 주식회사 인덕션 히터를 갖는 세탁장치
DE102019103593A1 (de) * 2019-02-13 2020-08-13 Miele & Cie. Kg Verfahren und Vorrichtung zum Betrieb eines einen Behandlungsraum aufweisenden Haushaltsgeräts mit einem Heizkörper und Haushaltsgerät

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT300989B (de) * 1969-03-11 1972-08-10 Barvy A Laky Narodni Podnik Mit Wasser verdünnbares, säurehärtendes Anstrichmittel
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
AUPO043896A0 (en) * 1996-06-13 1996-07-04 Philips Electronics Australia Limited Circuit arrangement for controlling a heating element
DE19645095A1 (de) * 1996-11-01 1998-05-07 Ego Elektro Geraetebau Gmbh Beheizung
DE10220413A1 (de) * 2002-05-08 2003-11-27 Behr Gmbh & Co Verfahren und Vorrichtung zur Temperaturüberwachung eines elektrischen Heizelements
DE10260163A1 (de) * 2002-12-20 2004-07-08 BSH Bosch und Siemens Hausgeräte GmbH Geschirrspülmaschine
DE10342924B4 (de) * 2003-09-15 2006-07-06 Geßler Electronic GmbH Überhitzungsschutzschaltung und Verfahren zu deren Betrieb

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006136464A1 *

Also Published As

Publication number Publication date
CN2884768Y (zh) 2007-03-28
CN101203819A (zh) 2008-06-18
DE102005029921A1 (de) 2007-01-04
WO2006136464A1 (fr) 2006-12-28

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