EP0576408B1 - Champ de cuisson avec plaques électriques multiples à commande électronique - Google Patents

Champ de cuisson avec plaques électriques multiples à commande électronique Download PDF

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Publication number
EP0576408B1
EP0576408B1 EP93830268A EP93830268A EP0576408B1 EP 0576408 B1 EP0576408 B1 EP 0576408B1 EP 93830268 A EP93830268 A EP 93830268A EP 93830268 A EP93830268 A EP 93830268A EP 0576408 B1 EP0576408 B1 EP 0576408B1
Authority
EP
European Patent Office
Prior art keywords
control unit
cooking hob
plate
input
user
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
EP93830268A
Other languages
German (de)
English (en)
Other versions
EP0576408A1 (fr
Inventor
Roberto Bertazzoni
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.)
Smeg SpA
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Smeg SpA
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Filing date
Publication date
Application filed by Smeg SpA filed Critical Smeg SpA
Publication of EP0576408A1 publication Critical patent/EP0576408A1/fr
Application granted granted Critical
Publication of EP0576408B1 publication Critical patent/EP0576408B1/fr
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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F24C15/102—Tops, e.g. hot plates; Rings electrically heated
    • F24C15/106—Tops, e.g. hot plates; Rings electrically heated electric circuits

Definitions

  • the present invention concerns the cooking hobs provided with electric plates and particularly refers to a cooking hob with electronically controlled multiple electric plates.
  • the cooking hobs provided with two or more electric plates presently have limited diffusion owing to the high power input required when several cooking points are activated. In fact, this need is in contrast with the limited input available for the domestic electric installations.
  • each activated plate is inserted at line voltage and works therefore with the maximum power input. Owing to this, assuming a normal power input to the other domestic appliances or the like connected to the installation, the activation of even two electric plates only of the cooking hob causes an overall power input which often exceeds the maximum allowed input.
  • the object of the present invention is therefore to provide a cooking hob with multiple electric plates having a varying power input adjusted so that the overall input does not exceed a prearrangeable level.
  • a cooking hob provided with two or more electric plates and including an electronic control unit which detects both the overall instant power input and possible variations of input demanded by the user, and controls the supply to the electric plates according thereto so that the overall electric power input of the cooking hob does not exceed a maximum predetermined value.
  • a cooking hob includes four electric plates 1 each one provided with an adjacent pilot light 2 and a respective power regulator 3.
  • Each one of said regulators consists of seven push-buttons and is arranged on the front side of the cooking hob, while a main board 4 is arranged in the frontal area of the cooking hob itself.
  • the board 4 includes in turn a main switch 5, a commutator 6 to select, from time to time, one of the plates 1, and a programmable timer 7 with which the desired operating period for the selected plate can be possibly preset.
  • the push-buttons of each regulator 3 preferably include a circular ring-shaped pilot light to clearly display their status.
  • the push-button "0" when continuously lit, shows that the corresponding plate is switched off, while its intermittent lighting shows an operating condition of the corresponding plate which will be made clear later on.
  • the remaining push-buttons of each regulator 3 are needed to control the switching on of the corresponding plate 1 at different power levels, with the push-button "6" only corresponding to the maximum power level and therefore to the supply of the plate with the whole line voltage.
  • the switching on of a plate 1 at any power level will preferably involve, for a better and faster understanding of the operating status of the plate itself, the lighting of the corresponding push-button and of all those corresponding to a lower power level, as well as the switching off of the push-button "0". This preferably has a colour different from the others and by pushing it, of course, the deactivation of the corresponding plate is obtained.
  • Each pilot light 2 is controlled by a temperature sensor not shown which controls the lighting of said light when the corresponding plate 1 reaches a temperature higher than a level above which the contact with the plate would be dangerous for the user.
  • the main board 4 is connected via a bus 4a to an electronic control unit 8, preferably of the microprocessor type.
  • the unit 8 receives the data relative to the selection of the plates 1 to activate and to the determination of the respective operating periods. It should be noted that for the activation of a plate it is not indispensable the use of the commutator 6 and the timer 7.
  • the unit 8 is connected also to each power regulator 3 via a respective bidirectional bus 3a.
  • the unit 8 therefore is able to receive the commands given by the user through the push-buttons of the regulator 3, as well as to control the switching on and off of the push-buttons themselves to inform the user on the operating conditions of each plate.
  • each voltage reducer 9 can produce, according to the control signals from the unit 8, six different values of output voltage with which to supply the corresponding plate 1, and it is obvious that the electronic control unit 8 can completely prevent the supply to one or more plates 1.
  • the power level demanded by the user through a regulator 3 does not necessarily correspond to the power actually supplied to the corresponding plate 1 since the corresponding voltage reducer 9 is controlled by the control unit 8 according to the overall power input that the unit 8 is able to calculate continuously by controlling all the reducing circuits 9.
  • the electronic control unit automatically acquires the stored value of the maximum allowed power input.
  • Said value is preferably set by the manufacturer of the control unit but one could think of making it adjustable by the installer, for example through suitable controls to be added to the main board, and this in order to adapt the cooking hob to the user's requirements as far as the power consumption is concerned.
  • the control unit When the user, in case after having selected a plate and programmed the length of its period of activation, demands the activation of the plate at a certain power level by acting on the corresponding regulator, the control unit first of all checks, through the test 11, if said activation would imply exceeding the maximum allowed limit of power input. In this case the control unit further checks (test 12) if it is possible to keep the input in said limit by switching on the required plate at a lower power level. In this case the control unit controls the switching on of the plate at the highest power level compatible with the allowed limit.
  • control unit waits to detect a sufficient lowering of the power input of the plates already activated, and if said lowering does not take place within a predetermined time Tmax (test 13) the control unit considers the request of activation of the selected plate as canceled. If, instead, a sufficient limitation of the instant power input takes place within said period, the control unit controls the activation of the selected plate at the highest power level which keeps anyway the overall input not above the allowed limit.
  • Both the forced limitation of the requested power, and the suspension and possible cancellation of the request of activation of a plate are preferably reported to the user by means of, respectively, e.g. the intermittent lighting of the push-button corresponding to the actual power level activated for the selected plate and the intermittent lighting of the push-button "0".
  • control unit controls the switching on of the selected plate at the power level demanded by the user. It is clear that this is what happens whenever the user demands the switching on of a plate while no other plate results to be activated.
  • control unit When the control unit detects the running out of the preset period of activation of a plate or the deactivation of the same by the user through the pushbutton "0", the control unit switches off the plate.
  • control unit carries out a single test 11' to check if the activation of a plate at the requested power level implies an overall input not higher than the maximum allowed, in which case the switching on of the selected plate with the requested power takes place.
  • control unit provides to calculate lower input values, among the allowed ones, for all the plates switched on as well as for the new selected plate, so that the new overall input does not exceed the maximum limit.
  • control unit controls the lowering of the input levels of the plates switched on to the values calculated in this way, and then the switching on of the selected plate, also with an actual input lower than that originally demanded by the user.
  • a different embodiment of the cooking hob according to the present invention can provide for eliminating the voltage reducers 9 and therefore activating each electric plate 1 at the respective maximum power level.
  • the electronic control unit in order to prevent the power input from exceeding the maximum allowed value, the electronic control unit must handle the periodical activation of each plate while achieving the continuity of heating anyway, thanks to the thermal inertia of the plate.
  • the electronic control unit devises a switching on sequence so as to avoid any way the exceeding of the maximum allowed input level. It is apparent that also in this case it is possible to account for predetermined priorities in the activation of the electric plates.
  • a cooking hob according to the present invention can include a different number of electric plates and therefore of the respective power regulators, while the latter may be of any type suitable for the purpose and in particular such as to allow the activation of the corresponding plate at different power levels.
  • both the main board and all the signals, particularly the optical ones, may be of any kind suitable for this use.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Control Of Resistance Heating (AREA)
  • Baking, Grill, Roasting (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electric Stoves And Ranges (AREA)
  • Regulation And Control Of Combustion (AREA)

Claims (7)

  1. Table de cuisson munie de deux ou plusieurs plaques électriques (1), caractérisée en ce qu'elle comporte une unité de commande électronique (8) qui détecte à la fois la puissance d'entrée totale instantanée et ses variations possibles requises par l'utilisateur et commande en conséquence l'alimentation des plaques électriques de manière que la puissance électrique totale d'entrée de la table de cuisson n'excède pas une valeur maximale prédéterminée.
  2. Plaque de cuisson selon la revendication 1, caractérisée en ce que l'unité de commande électronique (8) commande des circuits réducteurs de tension (9) qui reçoivent en entrée la tension du réseau et produisent une tension qui n'est pas supérieure à une tension de sortie avec laquelle ils alimentent les plaques électriques correspondantes (1).
  3. Table de cuisson selon la revendication 2, caractérisée en ce que l'unité de commande électronique (8) permet l'alimentation d'une plaque électrique (1) avec la puissance d'entrée demandée par l'utilisateur si la puissance d'entrée totale correspondante, calculée par l'unité de commande, n'est pas plus élevée que la valeur maximale prédéterminée.
  4. Table de cuisson selon la revendication 3, caractérisée en ce que l'unité de commande électronique (8) permet l'alimentation d'une plaque électrique (1) même si la puissance d'entrée totale qui résulte des demandes de l'utilisateur, calculée par l'unité de commande, est plus élevée que la valeur maximale préréglée, l'unité de commande vérifiant la possibilité de maintenir la puissance d'entrée totale dans ladite limite en mettant cette plaque (1) en service à une puissance plus faible que celle demandée.
  5. Table de cuisson selon la revendication 5, caractérisée en ce que l'unité de commande (8) permet l'alimentation d'une plaque électrique (1) même si la puissance d'entrée totale qui résulte de la demande de l'utilisateur, calculée par l'unité de commande, est plus élevée que la valeur maximale préréglée, l'unité de commande détectant, dans un laps de temps prédéterminé à partir de la requête de l'utilisateur, un abaissement de la puissance d'entrée instantanée totale suffisant pour la mise en service de la plaque (1) à l'un des niveaux de puissance disponibles pour elle.
  6. Table de cuisson selon la revendication 3, caractérisée en ce que l'unité de commande électronique (8) permet l'alimentation d'une plaque électrique (1) même si la puissance d'entrée totale résultant de la demande par l'utilisateur, calculée par l'outil de commande, est plus élevée que la valeur maximale préréglée , par calcul de valeurs d'entrée plus faibles à la fois pour la plaque (1) dont la mise en service est demandée et pour les plaques (1) déjà en service de sorte que la puissance d'entrée totale n'excède pas la limite permise, et réglage de la puissance d'entrée instantanée aux dites valeurs.
  7. Table de cuisson selon la revendication 1, caractérisée en ce que l'outil de commande (8) commande la mise en service périodique et combinée des plaques (1) alimentées avec la tension du réseau.
EP93830268A 1992-06-23 1993-06-23 Champ de cuisson avec plaques électriques multiples à commande électronique Expired - Lifetime EP0576408B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI921540 1992-06-23
ITMI921540A IT1255162B (it) 1992-06-23 1992-06-23 Piano di cottura a piastre elettriche multiple controllate elettronicamente

Publications (2)

Publication Number Publication Date
EP0576408A1 EP0576408A1 (fr) 1993-12-29
EP0576408B1 true EP0576408B1 (fr) 1997-03-05

Family

ID=11363566

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93830268A Expired - Lifetime EP0576408B1 (fr) 1992-06-23 1993-06-23 Champ de cuisson avec plaques électriques multiples à commande électronique

Country Status (4)

Country Link
EP (1) EP0576408B1 (fr)
DE (1) DE69308397T2 (fr)
ES (1) ES2098715T3 (fr)
IT (1) IT1255162B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU240762U1 (ru) * 2025-06-30 2026-01-29 Открытое акционерное общество "Авангард" Контроллер электрической варочной панели

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4445558A1 (de) * 1994-12-20 1996-06-27 Bosch Siemens Hausgeraete Leistungssteuerung für elektrische Verbraucher, vorzugsweise Heizkörper für Kochfelder
DE59611116D1 (de) * 1996-09-04 2004-11-18 Siebe Appliance Controls Gmbh Vorrichtung zur Begrenzung und Verteilung der von einem Herd aufgenommenen elektrischen Leistung
DE19900185A1 (de) * 1999-01-07 2000-07-13 Ego Elektro Geraetebau Gmbh Verfahren und Vorrichtung zum Schalten von Verbrauchern eines Elektrogerätes
ITMI20011253A1 (it) * 2001-06-14 2002-12-14 Whirlpool Co Sistema di gestione della potenza in apparecchi di cottura elettrici
ITMC20010102A1 (it) * 2001-10-17 2003-04-17 Tecnowind Spa Sistema per la gestione coordinata delle piastre dei piani di cotturaelettrici.
DE102004033449A1 (de) * 2004-07-06 2006-01-26 E.G.O. Elektro-Gerätebau GmbH Kochfeld mit mehreren Heizeinrichtungen
ES2328550B1 (es) 2007-10-18 2010-08-30 Bsh Electrodomesticos España, S.A. Campo de coccion.
US10024545B2 (en) * 2014-04-17 2018-07-17 Whirlpool Corporation Power management for home appliances
CN108006720B (zh) * 2017-11-17 2019-04-30 广东美的厨房电器制造有限公司 炉具的控制方法以及控制系统

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4237368A (en) * 1978-06-02 1980-12-02 General Electric Company Temperature sensor for glass-ceramic cooktop
US4816647A (en) * 1987-11-13 1989-03-28 General Electric Company Power control for appliance having a glass ceramic cooking surface

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU240762U1 (ru) * 2025-06-30 2026-01-29 Открытое акционерное общество "Авангард" Контроллер электрической варочной панели

Also Published As

Publication number Publication date
ITMI921540A0 (it) 1992-06-23
DE69308397D1 (de) 1997-04-10
IT1255162B (it) 1995-10-20
ES2098715T3 (es) 1997-05-01
EP0576408A1 (fr) 1993-12-29
DE69308397T2 (de) 1997-08-07
ITMI921540A1 (it) 1993-12-23

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