EP1255420B1 - Anzeigevorrichtung - Google Patents

Anzeigevorrichtung Download PDF

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Publication number
EP1255420B1
EP1255420B1 EP02007843A EP02007843A EP1255420B1 EP 1255420 B1 EP1255420 B1 EP 1255420B1 EP 02007843 A EP02007843 A EP 02007843A EP 02007843 A EP02007843 A EP 02007843A EP 1255420 B1 EP1255420 B1 EP 1255420B1
Authority
EP
European Patent Office
Prior art keywords
residual heat
mains voltage
counter
cooking appliance
heat indicator
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.)
Expired - Lifetime
Application number
EP02007843A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1255420A2 (de
EP1255420A3 (de
Inventor
Ralf Schneider
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 EP1255420A2 publication Critical patent/EP1255420A2/de
Publication of EP1255420A3 publication Critical patent/EP1255420A3/de
Application granted granted Critical
Publication of EP1255420B1 publication Critical patent/EP1255420B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to a display device, in particular a residual heat indicator of an electric cooking appliance according to the features of the independent claims.
  • Electric cooking appliances especially those with a hob or cooking zones made of a non-metallic material such as glass ceramic, typically have a residual heat warning device.
  • the warning device emits a warning signal if the surface temperature of a cooking zone is above a critical value for a contact. In this way, the risk is reduced to burn in contact with heated surfaces of the hob. Since the hob remains hot even after the shutdown of the cooking device for a certain period of time, it makes sense to continue to output the warning of the residual heat indicator even after switching off the cooking appliance until the hob has cooled down.
  • the direct detection of the hob temperature by means of a temperature sensor would be possible, but relatively expensive and expensive.
  • a counter is set to a starting value on the basis of empirically determined cooling times as a function of the switch-on or power level and the switch-on duration of the cooking appliance. After switching off the hob, the counter counts back from its current starting value to zero. Once this zero value is reached, the residual heat warning device is turned off.
  • the disadvantage here is the volatility of the counter start value, for example, in an interruption of the mains voltage as in a power failure. In such a case, the counter is set to zero and thus the residual heat warning device is switched off, although the hob may still be in a hot state.
  • a mains interruption or a power failure is also taken into account, in that in addition to the residual heat indicator, a mains voltage detector is provided, which is the concern of the Mains voltage detected on the cooking appliance. After a mains voltage interruption, the residual heat warning device emits a special warning signal, which indicates a previous power failure.
  • the present invention has for its object to provide a residual heat warning device for a cooking appliance available that allows a reliable display of the residual heat of a hob even with mains voltage interruptions.
  • an electric cooking appliance with at least one hob with hot in the hot state cooking zones an optical residual heat indicator, which indicates hot cooking zones when placed at mains voltage cooking appliance.
  • the cooking appliance has a counter in order to switch off the residual heat display after switching off the appliance connected to mains voltage with a time delay.
  • a mains voltage detector is provided on the cooking appliance, which detects the concerns of the mains voltage on the cooking appliance.
  • information is stored in a memory as long as the counter reading is greater than zero, and that after a mains voltage interruption, the residual heat indicator remains activated for a certain period of time as a function of the requested memory content, if the information in the memory indicates a counter value greater than zero ,
  • This electric cooking appliance according to the invention has the advantage of a reliable residual heat indicator even after a previous mains voltage interruption, for example. Due to a power failure, on. As a result, in contrast to known residual heat indicators in almost all cases can reliably be warned against touching the still hot cooktops by optical and / or acoustic means.
  • An embodiment of the invention provides that at least two meter readings are stored in the memory, as long as the count is greater than zero, with the advantage that in this way a more reliable estimate of the remaining remaining heat duration is possible.
  • the residual heat indicator can first be reset in order, after switching off the cooktop, to let the display be activated again by means of the counter for a certain period of time.
  • the residual heat indicator can output an optical and / or acoustic signal after a mains voltage interruption, whereby the advantage of a conspicuous signaling of residual heat is connected, which can ensure a high degree of attention.
  • An inventive method for operating a residual heat indicator of an electric cooking device includes detecting the on state of the cooking appliance, signaling a residual heat warning signal on the residual heat indicator, as long as the cooking appliance is connected to mains voltage and generating a delay interval by means of a counter to the residual heat indicator after switching off the Switch off the mains voltage of the cooking appliance with a time delay. It is further provided that the cooking appliance has a mains voltage detector which detects the concerns of the mains voltage on the cooking appliance. In addition, the method provides that information is stored in a memory, as long as the count is greater than zero, and that after a mains voltage interruption, the residual heat indicator remains activated for a certain period of time depending on the requested memory content, if the information in memory a counter value greater Contains zero.
  • This method according to the invention has the advantage of a reliable residual heat indicator even after a previous mains voltage interruption, which can be reliably warned against contact of the still hot hobs by optical and / or acoustic means in almost all cases occurring.
  • a variant of the method according to the invention provides that at least two meter readings are stored in the memory as long as the meter reading is greater than zero. This has the advantage of a more reliable estimation of the remaining residual heat duration.
  • the values of the counter are stored at regular intervals and used after a mains voltage interruption for the time-delayed switching off of the residual heat indicator and / or for issuing a power failure warning signal.
  • This embodiment of the invention has the advantage of a very reliable determination of the residual heat duration due to the stored counter values, resulting in a relatively exact correspondence of the residual heat indicator with the actual time during which the cooktop is hot.
  • a further embodiment of the method according to the invention provides that in an EEPROM of the memory, a residual heat flag can assume two different states and that after the remaining heat duration has elapsed, the residual heat indicator is deactivated and the residual heat flag is deleted.
  • a very cost-effective and at the same time very reliable protection function can be represented, which can provide a residual heat indicator even after a power failure.
  • a variant of the method according to the invention provides that after a mains voltage interruption an interrogation of the residual heat flag is provided, that a pre-assignment of the counter is provided with a meaningful value and that after the expiration of the residual heat duration of the residual heat flag is deleted.
  • the pre-assignment with an empirically determined meaningful default value of the counter ensures a better match of the actual residual heat duration and the display duration of the residual heat indicator.
  • the counter reading is stored at regular intervals in the EEPROM.
  • a query of the memory value of the EEPROM is provided after a mains voltage interruption, after which a re-initialization of the counter takes place due to the memory value of the EEPROM.
  • the residual heat indicator outputs a flashing signal after a mains voltage interruption, whereby the advantage of an increase of the signal effect due to the optically conspicuous signal is accompanied.
  • the residual heat indicator emits an acoustic signal after a mains voltage interruption.
  • an embodiment according to the invention provides that the residual heat indicator is switched off after the cooking appliance has been switched on again. This has the advantage that a re-initialization of the counter is thus possible in order to reliably display the residual heat indicator after a shutdown of the cooking appliance again the residual heat. In addition, the residual heat indicator is usually no longer needed when the device is switched on again.
  • FIG. 1 shows a schematic plan view of a hob 2 a cooking appliance or a cooker with four cooking zones 4.
  • the hob 2 is preferably a per se known glass ceramic hob with a flat surface. Below the glass ceramic plate of the hob 2 four known controllable heating elements are arranged, which are not visible in the illustration shown.
  • Each cooking zone 4 is associated with a residual heat indicator 6, for example.
  • a residual heat indicator 6 for example.
  • the glass ceramic plate light emitting diode In the form of a arranged below the glass ceramic plate light emitting diode.
  • the cooking zones 4 are connected to the associated heating elements or the stove and the hob 2 via a network connection 12 to a conventional 230-volt AC mains.
  • the heating elements of the cooktops 4 are switched on by a known per se control unit 14 of the cooker according to the power settings made by an operator on known setting elements of the stove power settings and their heating power adjustable.
  • the control unit 14 may be, for example, a power switching electronics with a microprocessor control.
  • a counter 8 is provided and coupled to the control unit 14 and the residual heat indicator 6.
  • the counter 8 may be part of the microprocessor control.
  • a mains voltage detector 10 is provided in the cooking appliance, which detects the voltage applied to the cooktop 2 via the network connection 12 or voltage derived therefrom. As a result, it can also be detected whether the cooking appliance is connected to mains voltage.
  • the mains voltage detector 10 is also coupled to the residual heat display 6, the counter 8 and the control unit 14. A voltage increase from zero to operating voltage can typically occur in two situations; in a first installation of the cooking appliance when connecting the network connection 12 to the mains and in the restoration of the power supply after a mains voltage interruption, eg. Due to a power failure. If an application of the mains voltage to the cooking appliance is detected, a power failure warning signal is triggered.
  • the residual heat indicator 6 shows different display contents depending on the desired information content for the user.
  • a residual heat of the already switched off but still hot cooking zone 4 is represented by an interruption-free shining optical signal. That is, as long as the residual heat indicator 6 is lit, the cooking zone 4 is still hot and should not be touched.
  • a previous power failure can be signaled by a regular intermittent display, whereby increased attention of the operator can be guaranteed.
  • the operator is made clear with the flashing display that the actual residual heat duration may possibly differ from the duration of the flashing display, because the counter 8 has possibly been set to a meaningful value, but not to a value corresponding to the actual remaining heat duration.
  • a shutdown of the power failure warning signal can be provided by a suitable key provided. Pressing this key may cause a reset of the residual heat indicator 6.
  • the counter 8 can be incremented up to a maximum value in each cooking operation of a cooking zone 4 in response to the set cooking level.
  • a memory cell is set in the EEPROM of the counter 8, a so-called residual heat flag.
  • the counter 8 is decremented. As long as the counter value is greater than zero, the residual heat indicator 6 is activated. After the residual heat has expired, the residual heat indicator 6 is deactivated and deleted the residual heat in the EEPROM. After a mains voltage interruption detected by the mains voltage detector 10, the residual heat flag is interrogated in the EEPROM.
  • the counter 8 is pre-assigned with a meaningful value previously determined empirically, which corresponds to a certain residual heat duration.
  • the residual heat indicator 6 is switched to the flashing and / or acoustic mode.
  • the counter 8 is then decremented and the flag cleared in the EEPROM.
  • the current state of the counter 8 can be stored in the EEPROM at regular intervals. This variant is preferably suitable if the internal or external EEPROM used is suitable for a high number of write accesses. After a mains voltage interruption, the counter 8 can be assigned the last value stored in the EEPROM. If the counter reading is greater than zero, the residual heat indicator 6 is activated (flashing) and the counter 8 is decremented until the calculated residual heating time ends. The estimated residual heat duration in this way corresponds relatively accurately to the residual heat still remaining in the cooking zone 4.
  • the operator is signaled that the display duration does not necessarily correspond to the actual residual heat duration.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Cookers (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Vehicle Body Suspensions (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Baking, Grill, Roasting (AREA)
  • Control Of Resistance Heating (AREA)
EP02007843A 2001-05-03 2002-04-08 Anzeigevorrichtung Expired - Lifetime EP1255420B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10121534A DE10121534A1 (de) 2001-05-03 2001-05-03 Anzeigevorrichtung
DE10121534 2001-05-03

Publications (3)

Publication Number Publication Date
EP1255420A2 EP1255420A2 (de) 2002-11-06
EP1255420A3 EP1255420A3 (de) 2005-04-27
EP1255420B1 true EP1255420B1 (de) 2009-09-16

Family

ID=7683504

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02007843A Expired - Lifetime EP1255420B1 (de) 2001-05-03 2002-04-08 Anzeigevorrichtung

Country Status (5)

Country Link
US (1) US6797297B2 (es)
EP (1) EP1255420B1 (es)
AT (1) ATE443425T1 (es)
DE (2) DE10121534A1 (es)
ES (1) ES2331603T3 (es)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005109956A1 (ja) * 2004-05-10 2005-11-17 Kabushiki Kaisha Toshiba 加熱調理器
US7069090B2 (en) * 2004-08-02 2006-06-27 E.G.O. North America, Inc. Systems and methods for providing variable output feedback to a user of a household appliance
ES2325108B1 (es) * 2006-09-13 2010-06-01 Bsh Electrodomesticos España, S.A. Dispositivo de cocina.
US7554060B2 (en) * 2006-09-29 2009-06-30 England Raymond O Displaying cooking-related information
DE102009001740B4 (de) * 2009-03-23 2013-10-31 BSH Bosch und Siemens Hausgeräte GmbH Hausgerätvorrichtung
ES2363698B1 (es) * 2009-04-29 2012-06-13 BSH Electrodomésticos España S.A. Aparato doméstico con una pantalla con medios de introducción por contacto.
DE102009035758A1 (de) * 2009-07-27 2011-02-03 E.G.O. Elektro-Gerätebau GmbH Bedieneinheit
DE102010002882A1 (de) 2010-03-15 2011-09-15 BSH Bosch und Siemens Hausgeräte GmbH Glaskeramik-Kochfeld
ES2404339B1 (es) * 2011-03-23 2014-05-21 BSH Electrodomésticos España S.A. Procedimiento para ajustar una corriente de conexión de un aparato doméstico, y aparato doméstico, en especial, campo de cocción, con una unidad de control para ejecutar el procedimiento
US9006614B2 (en) 2012-05-17 2015-04-14 Whirlpool Corporation Cooking appliance and method for same
PL399809A1 (pl) 2012-07-05 2014-01-07 Diehl Ako Stiftung & Co. Kg Sposób i uklad gradientowego wskazywania ciepla resztkowego plyt kuchennych
US9119248B2 (en) * 2012-12-18 2015-08-25 General Electric Company Method for controlling a light emitting device in a cooktop appliance
US10024545B2 (en) * 2014-04-17 2018-07-17 Whirlpool Corporation Power management for home appliances
CN112524648A (zh) * 2019-09-18 2021-03-19 博西华电器（江苏）有限公司 用于灶具的余热提示方法及灶具

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3003419A1 (de) * 1980-01-31 1981-08-06 Ego Regeltech Verfahren und vorrichtung zur heissanzeige
DE3118414C2 (de) * 1981-05-09 1984-02-23 Diehl Gmbh & Co, 8500 Nuernberg Restwärmeanzeige für einen elektrisch beheizbaren Herd
FR2650669B1 (fr) * 1989-08-04 1993-10-29 Equipement Menager Cie Europ Dispositif de mesure de temperature pour appareil de cuisson a induction et appareil comportant un tel dispositif
DE4004309A1 (de) * 1990-02-13 1991-08-14 Ego Elektro Blanc & Fischer Anzeigeeinrichtung fuer kochgeraete
IT1296492B1 (it) * 1997-11-21 1999-06-25 Whirlpool Co Sistema per indicare il calore residuo delle griglie di apparecchi domestici di cottura a gas
DE19923995A1 (de) * 1999-05-26 2000-11-30 Bsh Bosch Siemens Hausgeraete Haushaltsgerät mit Uhreinheit und Verfahren zum Betreiben der Uhreinheit
DE19925228B4 (de) * 1999-06-01 2007-11-15 BSH Bosch und Siemens Hausgeräte GmbH Gargerät mit Restwärmeanzeige und Verfahren zum Betrieb der Restwärmeanzeige

Also Published As

Publication number Publication date
US6797297B2 (en) 2004-09-28
DE50213842D1 (de) 2009-10-29
ES2331603T3 (es) 2010-01-11
ATE443425T1 (de) 2009-10-15
EP1255420A2 (de) 2002-11-06
EP1255420A3 (de) 2005-04-27
US20020189464A1 (en) 2002-12-19
DE10121534A1 (de) 2002-11-07

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