EP1049358A3 - Electric heater assembly - Google Patents

Electric heater assembly Download PDF

Info

Publication number
EP1049358A3
EP1049358A3 EP00303417A EP00303417A EP1049358A3 EP 1049358 A3 EP1049358 A3 EP 1049358A3 EP 00303417 A EP00303417 A EP 00303417A EP 00303417 A EP00303417 A EP 00303417A EP 1049358 A3 EP1049358 A3 EP 1049358A3
Authority
EP
European Patent Office
Prior art keywords
sensor loop
heater
resonant circuit
circuit
energising
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Withdrawn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
EP00303417A
Other languages
German (de)
French (fr)
Other versions
EP1049358A2 (en
Inventor
Richard Charles Scott
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.)
Ceramaspeed Ltd
Original Assignee
Ceramaspeed 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 Ceramaspeed Ltd filed Critical Ceramaspeed Ltd
Publication of EP1049358A2 publication Critical patent/EP1049358A2/en
Publication of EP1049358A3 publication Critical patent/EP1049358A3/en
Withdrawn legal-status Critical Current

Links

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
    • 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
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/05—Heating plates with pan detection means

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Baking, Grill, Roasting (AREA)

Abstract

An electric heater assembly comprises at least one electric heater, each of which incorporates at least one sensing means (8) for use in detecting a cooking vessel (9) on a cooking plate (7) overlying the heater. The sensing means (8) is provided for the purpose of effecting selective energising and/or de-energising of one or more electric heating elements (3) in the or each heater. The or each sensing means (8) comprises an electrically conductive sensor loop. The or each sensor loop is connected to a circuit (100) comprising a non-oscillatory resonant circuit (102, 103), for the or each sensor loop, driven by an oscillatory circuit (101) such that the or each resonant circuit is operated at within ± 15 percent of its resonant frequency, the resonant circuit not forming part of the oscillatory circuit (101). A transformer (104, 105, 106), associated with the or each sensor loop (8), has a first winding (105) connected in the resonant circuit and a second winding (106) connected to, or integral with, its associated sensor loop (8). Means (110, 111) is provided to monitor change in a parameter associated with electric current in and voltage across the or each resonant circuit (102, 103) as a result of placement and/or removal of a cooking vessel (9) on and/or from the cooking plate (7) and to effect selective energising and/or de-energising of one or more electric heating elements (3) in the or each heater.
EP00303417A 1999-04-27 2000-04-25 Electric heater assembly Withdrawn EP1049358A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9909636A GB2349471B (en) 1999-04-27 1999-04-27 Electric heater assembly
GB9909636 1999-04-27

Publications (2)

Publication Number Publication Date
EP1049358A2 EP1049358A2 (en) 2000-11-02
EP1049358A3 true EP1049358A3 (en) 2003-10-01

Family

ID=10852330

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00303417A Withdrawn EP1049358A3 (en) 1999-04-27 2000-04-25 Electric heater assembly

Country Status (2)

Country Link
EP (1) EP1049358A3 (en)
GB (1) GB2349471B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0217351D0 (en) * 2002-07-25 2002-09-04 Ceramaspeed Ltd Radiant electric heater
GB2392499B (en) * 2002-08-24 2005-10-05 Ceramaspeed Ltd Electric heater
DE10305788A1 (en) 2003-02-06 2004-09-02 E.G.O. Elektro-Gerätebau GmbH Inductive sensor arrangement, especially for detecting pots on cooker hobs, has a control circuit connected to the sensors via MOSFET switches with low drain-source resistance
KR100661226B1 (en) 2005-12-02 2006-12-22 엘지전자 주식회사 Apparatus and method for detecting load of electric cooker

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3508289C1 (en) * 1985-03-08 1986-09-11 Thomson Brandt Gmbh Inverter for feeding a consumer with an inductive component
US5012206A (en) * 1989-04-20 1991-04-30 Werner Turck Gmbh & Co. Kg Inductive proximity switch
WO1993013634A1 (en) * 1991-12-23 1993-07-08 Deutsche Thomson-Brandt Gmbh Process and device for the inductive heating of containers of different sizes
US5893996A (en) * 1996-02-05 1999-04-13 E.G.O. Elektro-Geratebau Gmbh Electric radiant heater with an active sensor for cooking vessel detection

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3508289C1 (en) * 1985-03-08 1986-09-11 Thomson Brandt Gmbh Inverter for feeding a consumer with an inductive component
US5012206A (en) * 1989-04-20 1991-04-30 Werner Turck Gmbh & Co. Kg Inductive proximity switch
WO1993013634A1 (en) * 1991-12-23 1993-07-08 Deutsche Thomson-Brandt Gmbh Process and device for the inductive heating of containers of different sizes
US5893996A (en) * 1996-02-05 1999-04-13 E.G.O. Elektro-Geratebau Gmbh Electric radiant heater with an active sensor for cooking vessel detection

Also Published As

Publication number Publication date
GB2349471A (en) 2000-11-01
GB2349471B (en) 2003-08-06
EP1049358A2 (en) 2000-11-02
GB9909636D0 (en) 1999-06-23

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