EP0384659A2 - Plaques de cuisinière - Google Patents

Plaques de cuisinière Download PDF

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Publication number
EP0384659A2
EP0384659A2 EP90301684A EP90301684A EP0384659A2 EP 0384659 A2 EP0384659 A2 EP 0384659A2 EP 90301684 A EP90301684 A EP 90301684A EP 90301684 A EP90301684 A EP 90301684A EP 0384659 A2 EP0384659 A2 EP 0384659A2
Authority
EP
European Patent Office
Prior art keywords
hotplate
elements
relay
series
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Withdrawn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
EP90301684A
Other languages
German (de)
English (en)
Other versions
EP0384659A3 (fr
Inventor
Michael H. Buttery
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.)
Electrolux Household Appliances Ltd
Original Assignee
Emaco Ltd
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 Emaco Ltd filed Critical Emaco Ltd
Publication of EP0384659A2 publication Critical patent/EP0384659A2/fr
Publication of EP0384659A3 publication Critical patent/EP0384659A3/fr
Withdrawn legal-status Critical Current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
    • H05B3/72—Plates of sheet metal
    • 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
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/02—Heaters using heating elements having a positive temperature coefficient

Definitions

  • the invention relates to improvements in electric hotplates suitable for use in cooker hobs.
  • the initial current is at a maximum and falls to lower levels as the hotplate warms up.
  • the initial current may be high enough to cause unacceptable variations in local mains voltage or to cause fuses to fail or overload protection to operate and it is an object of the present invention to avoid this difficulty.
  • a hotplate suitable for use in a cooker hob comprises heating elements, two or more of which are connected in parallel in at least one mode of operation, the elements having a positive temperature coefficient of resistance, with the contacts of a relay connected in series with a said element and the operating coil of the relay connected to a source of power through a temperature-dependent resistor mounted in the hotplate, the arrangement being such that the relay contacts close when the temperature of the hotplate rises.
  • a cooker hotplate includes two resistive heating elements denoted by R1 and R2, both of which are made from a material having a substantial positive temperature, coefficient of resistivity.
  • the two elements are connected in parallel with one another and R2 is in series with a pair of normally open contacts S1 of a relay device.
  • the parallel pair of resistive elements R1 and R2 are connected between the terminals of a supply in series with a switching device S2 which is in the form of an energy regulator.
  • An operating coil C, of the relay device is connected between the supply terminals in series with a temperature sensitive resistor T, also having a high positive temperature coefficient of resistance.
  • a switch S3 is mounted on the control axle of the energy regulator S2 and is so positioned that it closes as the energy regulator is turned ON before power is applied to the heating elements R1 and R2.
  • the switching device S2 is not an energy regulator, but a series-parallel multi-positioned switch by means of which a number of elements, usually three or four, can be variously connected in different series and parallel combinations.
  • a number of elements usually three or four
  • the relay contacts S1 are arranged to be in series with at least one, but not all, of the elements.
  • the switch S3 in this case is arranged to close before the multi-position switch reaches the higher power settings, in which these parallel combinations of elements occur.
  • Figure 2 shows a modification in which one of the heating elements Rl/R2 itself acts as the temperature sensing resistor to control the current through the operating coil C of the relay device.
  • the relay is of a quick acting type, with normally closed contacts, and energization of the coil C by a sufficiently large current rapidly opens the contacts S1 against the force of the control spring P.
  • the invention is particularly suitable for use with hotplates of the kind in which a vitreous enamelled metal plate has a film, for example, a thick film, of resistive material formed on the enamelled insulating surface to form the heater elements, and also, in the case of an arrangement such as in Figure 1, the temperature sensing resistor T.
  • Such hotplates are particularly useful, since they have a low thermal capacity and, consequently, they warm up relatively rapidly, and also because there are many suitable resistive materials which cannot be drawn into wire to form conventional elements, but which can be applied in the form of a thick film. Suitable materials for this purpose are described in European Patent Application Publications Nos. 0286215A1, 0286216A1, 0286217A1 and 0300685A2.
  • Such materials include an electrically resistive track containing "a metal and a glass in such proportions as to produce a suitable resistivity and thermal expansion coefficient to match an electrically insulative substrate to which said track is applied and to permit adhesion of said track to said substrate".

Landscapes

  • Control Of Resistance Heating (AREA)
  • Resistance Heating (AREA)
EP19900301684 1989-02-20 1990-02-16 Plaques de cuisinière Withdrawn EP0384659A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8903828A GB2228395A (en) 1989-02-20 1989-02-20 Electric hotplates
GB8903828 1989-02-20

Publications (2)

Publication Number Publication Date
EP0384659A2 true EP0384659A2 (fr) 1990-08-29
EP0384659A3 EP0384659A3 (fr) 1992-02-19

Family

ID=10651989

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900301684 Withdrawn EP0384659A3 (fr) 1989-02-20 1990-02-16 Plaques de cuisinière

Country Status (3)

Country Link
EP (1) EP0384659A3 (fr)
JP (1) JPH03171584A (fr)
GB (1) GB2228395A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997021326A1 (fr) * 1995-12-04 1997-06-12 Aktiebolaget Electrolux Element chauffant a resistance pour cuiseur

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2344944A (en) * 1998-12-08 2000-06-21 Otter Controls Ltd Liquid heating appliance with thick film heating element

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0079483A1 (fr) * 1981-11-10 1983-05-25 E.G.O. Elektro-Geräte Blanc u. Fischer Dispositif de commande pour une plaque de cuisson électrique
EP0087511A1 (fr) * 1982-02-03 1983-09-07 E.G.O. Elektro-Geräte Blanc u. Fischer Dispositif de commande pour une plaque chauffante électrique
DE3518124A1 (de) * 1985-05-21 1986-11-27 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Elektrokochgeraet
FR2583947A1 (fr) * 1985-06-24 1986-12-26 Bosch Siemens Hausgeraete Dispositif de branchement pour la commande de puissance de chauffage dans des cuisinieres electriques
EP0233375A2 (fr) * 1986-01-04 1987-08-26 Schott Glaswerke Plaque céramique avec radiateurs ayant des conducteurs de chauffage à incandescence instantanée à l'allumage
GB2193617A (en) * 1986-07-09 1988-02-10 Ako Werke Gmbh & Co Radiant heating means
EP0103741B1 (fr) * 1982-09-16 1988-11-17 E.G.O. Elektro-Geräte Blanc u. Fischer Elément chauffant, en particulier élément chauffant radiant pour le chauffage de plaques en céramique

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0079483A1 (fr) * 1981-11-10 1983-05-25 E.G.O. Elektro-Geräte Blanc u. Fischer Dispositif de commande pour une plaque de cuisson électrique
EP0087511A1 (fr) * 1982-02-03 1983-09-07 E.G.O. Elektro-Geräte Blanc u. Fischer Dispositif de commande pour une plaque chauffante électrique
EP0103741B1 (fr) * 1982-09-16 1988-11-17 E.G.O. Elektro-Geräte Blanc u. Fischer Elément chauffant, en particulier élément chauffant radiant pour le chauffage de plaques en céramique
DE3518124A1 (de) * 1985-05-21 1986-11-27 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Elektrokochgeraet
FR2583947A1 (fr) * 1985-06-24 1986-12-26 Bosch Siemens Hausgeraete Dispositif de branchement pour la commande de puissance de chauffage dans des cuisinieres electriques
EP0233375A2 (fr) * 1986-01-04 1987-08-26 Schott Glaswerke Plaque céramique avec radiateurs ayant des conducteurs de chauffage à incandescence instantanée à l'allumage
GB2193617A (en) * 1986-07-09 1988-02-10 Ako Werke Gmbh & Co Radiant heating means

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997021326A1 (fr) * 1995-12-04 1997-06-12 Aktiebolaget Electrolux Element chauffant a resistance pour cuiseur

Also Published As

Publication number Publication date
GB8903828D0 (en) 1989-04-05
GB2228395A (en) 1990-08-22
JPH03171584A (ja) 1991-07-25
EP0384659A3 (fr) 1992-02-19

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