WO2015101400A1 - Four électrique comprenant un montage de circuit conçu pour exciter des éléments chauffants à oxyde conducteur - Google Patents

Four électrique comprenant un montage de circuit conçu pour exciter des éléments chauffants à oxyde conducteur Download PDF

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Publication number
WO2015101400A1
WO2015101400A1 PCT/EP2013/078156 EP2013078156W WO2015101400A1 WO 2015101400 A1 WO2015101400 A1 WO 2015101400A1 EP 2013078156 W EP2013078156 W EP 2013078156W WO 2015101400 A1 WO2015101400 A1 WO 2015101400A1
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WO
WIPO (PCT)
Prior art keywords
conductive oxide
resistance
oxide coating
electrical oven
circuit
Prior art date
Application number
PCT/EP2013/078156
Other languages
English (en)
Inventor
Yusuf KUYUMCU
Ahmet Ihsan Yuce
Original Assignee
Arcelik Anonim Sirketi
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 Arcelik Anonim Sirketi filed Critical Arcelik Anonim Sirketi
Priority to PCT/EP2013/078156 priority Critical patent/WO2015101400A1/fr
Publication of WO2015101400A1 publication Critical patent/WO2015101400A1/fr

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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
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0258—For cooking
    • H05B1/0261—For cooking of food
    • H05B1/0263—Ovens
    • 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
    • H05B3/10—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • H05B3/141—Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds
    • 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
    • H05B3/62—Heating elements specially adapted for furnaces
    • 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
    • H05B2203/013—Heaters using resistive films or coatings

Definitions

  • the present invention relates to a circuit powering a heating element of an electrical oven, the heating element being provided in the form of a conductive oxide coating.
  • Transparent conductive films are composed of any one of various transparent conductive oxide materials, including indium oxide, indium tin oxide (ITO), tin oxide, tin oxide doped with fluorine (F) or antimony (Sb), zinc oxide and zinc oxide doped with aluminium (Al).
  • ITO indium tin oxide
  • tin oxide tin oxide doped with fluorine (F) or antimony (Sb)
  • ZnO zinc oxide
  • Al aluminium
  • Indium tin oxide is a transparent conducting oxide having wide-spread use due to its electrical conductivity and optical transparency. It further has the advantage of easy implementation as it can be deposited as a thin film.
  • certain disadvantages are to be presented in association with iridium, namely in regards to its high cost and limited supply, the fragility of iridium tin oxide layers, and also the costly layer deposition requiring vacuum.
  • an iridium tin oxide heater is typically provided as a deposited material applied to a glass cover in a food processing appliance such as an electrical oven. Electrical current is then passed through the ITO coating across the respective bottom and side walls to provide uniform heating.
  • FR 2848289 disclosing an oven chamber with guides at the sides to receive at least one heated partition made from a substrate in the form of a base with an external layer of direct heating conductors covered by an insulating layer.
  • the partition has contacts to make electrical contact and the oven chamber has guides at the sides to receive at least one heated partition.
  • the heating conductors are applied by vacuum deposition or pyrolysis projection, using an alloy based on NiCr, FeCr or an oxide such as tin oxide doped with Ce, La, Sb or Zn.
  • the present invention provides a simple circuit solution in terms of the number of the circuit elements involved and their functional complexity, by which a conductive oxide material based heating coating is supplied with electrical energy such that the time-dependant change in the ohmic resistivity of the conductive oxide material is compensated.
  • the present invention provides an electrical oven comprising at least one conductive oxide material based coating whose resistivity change is monitored to regulate its power output such that time-dependant resistance change is compensated as provided by the characterizing features defined in Claim 1.
  • Primary object of the present invention is to provide an electrical oven with conductive oxide material based heating coating involving no time-dependant change in the power output.
  • the present invention proposes an electrical oven having a plurality of walls with conductive oxide coating heating elements to which power is delivered by means of a heating coating power circuit incorporating a voltage regulation circuit and a resistance measurement circuit.
  • Each conductive oxide coating heating element has a conductive oxide coating resistance that is measured by the resistance measurement circuit such that a corresponding voltage is applied to said conductive oxide coating heating element, whereby a fixed power rate is obtainable.
  • Said conductive oxide coating heating element comprises indium oxide, zinc oxide or tin oxide layers and more preferably comprises an iridium tin oxide layer.
  • the resistance measurement can be made by means of a voltage divider or alternatively by disconnecting the conductive oxide coating heating element from the supply and applying a reference voltage.
  • Change rates in the ambient temperature and the conductive oxide coating heating element’s temperature can be monitored and an estimated resistance value can be obtained based on a preloaded reference data set.
  • the preloaded references values may include voltage values and these can be compared to actual voltage values in correlation with temperature data to make an estimate for the resistance value.
  • Fig. 1 demonstrates the power circuit’s general block diagram effecting the measurement of a respective heating element’s resistance according to an embodiment of the present invention.
  • Fig. 2 demonstrates the power circuit’s general block diagram for the measurement of a respective heating element’s resistance according to an alternative embodiment of the present invention.
  • Fig. 3 demonstrates the power circuit of Fig. 2 with a voltage regulation block according to the present invention.
  • Fig. 4 demonstrates the power circuit’s general block diagram according to the present invention.
  • the present invention proposes an electrical food processing appliance and particularly an electrical oven having a bottom wall, a top wall, a rear wall and side walls defining an inner closed food processing chamber accessible via a front door.
  • the food processing appliance’s walls comprises a planar heating coating for effecting heating of the food to be processed, said heating coating comprising a conductive oxide material composed of any one of various transparent conductive oxide materials, including indium oxide, indium tin oxide (ITO), tin oxide, tin oxide doped with fluorine (F) or antimony (Sb), zinc oxide and zinc oxide doped with aluminium (Al).
  • a conductive coating with a layer of tin oxide deposited on a substrate is described in US 5,798,142.
  • the heating coating or film maintaining its transparency in the operational temperature range provides that processed food can be monitored in a visually attractive manner.
  • Vacuum is typically interposed between said heating coating and an electrochromic layer on the outermost layer of the substrate.
  • the present invention provides a circuit which regulates the output power by changing the RMS value of the voltage applied to a respective heating element. It is established that instead of applying 230 V AC voltage to an iridium tin oxide (ITO) heating element of 40 ohm, 154 V can be applied starting from the first use of the electrical oven and time-dependant change in the resistance value can therefore be compensated by proportional voltage increase up to 230 V AC as in the case of domestic use. This ensures that the iridium tin oxide heating coating will be operable with a constant 600 W power rate as originally designed.
  • ITO iridium tin oxide
  • Fig. 1 demonstrates the circuit diagram for the measurement of a respective heating element’s resistance according to an embodiment of the present invention.
  • a voltage divider is used in the form of an indirect resistance measurement circuit (4) so as to perform measurement of the heating element’s resistance, by which a shunt resistance (3) is employed in series with the heating element.
  • resistance can be measured by means of a direct resistance measurement circuit (5), in which the conductive oxide coating resistance’s (2) terminals are disconnected from the power supply by means of respective relays (7).
  • the indirect resistance measurement can also performed by way of using temperature sensors and by measuring the heating element’s temperature as well as the ambient temperature in the electrical oven and by monitoring the change rate in the measured values over time.
  • the obtained change rate can be compared to a preloaded reference data set, and a correlation can be made to calculate an estimated resistance value.
  • the reference data set can optionally include voltage data in respect of a given temperature and the change in the measured temperature values over time can also be compared to preloaded voltage data and actual voltage data so that an estimated resistance value is obtained.
  • a control block (8) incorporating a microprocessor can perform the operational steps of the system such that the electrical oven is operable under a constant power rate.
  • Power regulation according to the invention can be realized by way of using a triac so that the duty cycle of the voltage waveform powering the heating element can be adjusted by triggering the switch at different voltage points.
  • the RMS power delivered to the load is hence effectively controllable.
  • an optocoupler module chip is used to isolate the high voltage triac from the logic circuits.
  • the control block (8) conventionally incorporates a triac driving block as well as circuit blocks in electrical communication with said resistance measurement circuits (4, 5).
  • the present invention proposes an electrical oven having a food processing chamber accessible via a front door and a plurality of planar walls enclosing said food processing chamber, said plurality of planar walls having at least one conductive oxide coating heating element effecting heating of food items in said food processing chamber.
  • the electrical oven further comprises a heating coating power circuit (1) delivering power to said at least one conductive oxide coating heating element having a conductive oxide coating resistance (2), said heating coating power circuit (1) comprising a voltage regulation circuit (6) and a resistance measurement circuit (4, 5).
  • said conductive oxide coating heating element preferably comprises indium oxide, zinc oxide or tin oxide layers and more preferably an iridium tin oxide layer.
  • said indirect resistance measurement circuit (4) performing measurement of conductive oxide coating resistance (2) comprises a voltage divider with a shunt resistance (3) in series with said conductive oxide coating resistance (2).
  • said direct resistance measurement circuit (5) performs measurement of conductive oxide coating resistance (2) by which the conductive oxide coating resistance’s (2) terminals are disconnected from the power supply by means of respective relays (7).
  • said electrical oven comprises temperature sensors measuring ambient temperature in the electrical oven as well as temperature of said conductive oxide coating resistance (2) upon which change rate in the measured values over time is compared to a preloaded reference data set so that an estimated resistance value is obtained.
  • Said preloaded reference data set may include voltage data in respect of a given temperature and the change rate in the measured temperature values over time can be compared to said preloaded voltage data and actual voltage data so that an estimated resistance value is obtainable.
  • said voltage regulation circuit (6) comprises a triac the duty cycle of which is adjusted, by which the RMS power delivered to the conductive oxide coating resistance (2) is controlled.
  • the present invention provides a simple circuit solution in terms of the number of the involved circuit elements and their functional complexity, by which a conductive oxide material based heating coating is supplied with electrical energy such that the time-dependant change in the ohmic resistivity of the conductive oxide material is compensated.

Abstract

La présente invention concerne un four électrique comprenant une chambre de traitement d'aliments accessible par une porte avant, et une pluralité de parois planes délimitant ladite chambre de traitement d'aliments. Lesdites parois planes présentent au moins un élément chauffant en forme de revêtement d'oxyde conducteur qui chauffe des produits alimentaires dans ladite chambre de traitement. Ledit four électrique comprend en outre un circuit d'alimentation de revêtement chauffant (1) qui fournit du courant audit/auxdits élément(s) chauffant(s) en forme de revêtement d'oxyde conducteur (2), ledit circuit d'alimentation de revêtement chauffant (1) comprenant un circuit de régulation de tension (6) et un circuit de mesure de résistance (4, 5).
PCT/EP2013/078156 2013-12-30 2013-12-30 Four électrique comprenant un montage de circuit conçu pour exciter des éléments chauffants à oxyde conducteur WO2015101400A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2013/078156 WO2015101400A1 (fr) 2013-12-30 2013-12-30 Four électrique comprenant un montage de circuit conçu pour exciter des éléments chauffants à oxyde conducteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2013/078156 WO2015101400A1 (fr) 2013-12-30 2013-12-30 Four électrique comprenant un montage de circuit conçu pour exciter des éléments chauffants à oxyde conducteur

Publications (1)

Publication Number Publication Date
WO2015101400A1 true WO2015101400A1 (fr) 2015-07-09

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PCT/EP2013/078156 WO2015101400A1 (fr) 2013-12-30 2013-12-30 Four électrique comprenant un montage de circuit conçu pour exciter des éléments chauffants à oxyde conducteur

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109931963A (zh) * 2019-02-01 2019-06-25 奥佳华智能健康科技集团股份有限公司 一种共享陪护床柜关门检测结构

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0169642A1 (fr) * 1984-06-14 1986-01-29 Donnelly Corporation Panneau composé chauffé electriquement
GB2274915A (en) * 1993-01-11 1994-08-10 Ist Lab Ltd An electrically heated oven
WO1996004766A1 (fr) * 1994-07-29 1996-02-15 Thermal Dynamics U.S.A., Ltd. Co. Element de chauffe par resistance electrique a grande surface et a film mince et procede d'application dudit film
GB2293253A (en) * 1994-09-14 1996-03-20 Glaverbel Aheated glazing panel
US6037572A (en) * 1997-02-26 2000-03-14 White Consolidated Industries, Inc. Thin film heating assemblies
WO2009135148A2 (fr) * 2008-05-01 2009-11-05 Thermoceramix Inc. Appareils de cuisson utilisant des revêtements de résistance

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0169642A1 (fr) * 1984-06-14 1986-01-29 Donnelly Corporation Panneau composé chauffé electriquement
GB2274915A (en) * 1993-01-11 1994-08-10 Ist Lab Ltd An electrically heated oven
WO1996004766A1 (fr) * 1994-07-29 1996-02-15 Thermal Dynamics U.S.A., Ltd. Co. Element de chauffe par resistance electrique a grande surface et a film mince et procede d'application dudit film
GB2293253A (en) * 1994-09-14 1996-03-20 Glaverbel Aheated glazing panel
US6037572A (en) * 1997-02-26 2000-03-14 White Consolidated Industries, Inc. Thin film heating assemblies
WO2009135148A2 (fr) * 2008-05-01 2009-11-05 Thermoceramix Inc. Appareils de cuisson utilisant des revêtements de résistance

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109931963A (zh) * 2019-02-01 2019-06-25 奥佳华智能健康科技集团股份有限公司 一种共享陪护床柜关门检测结构
CN109931963B (zh) * 2019-02-01 2021-06-04 奥佳华智能健康科技集团股份有限公司 一种共享陪护床柜关门检测结构

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