EP0620698A1 - Vorrichtung zur Anwesenheitserkennung eines Nahrungsmittelbehälters, wie einer Kochtopf oder ähnliches, auf einer Glaskeramik-Kochmulde - Google Patents

Vorrichtung zur Anwesenheitserkennung eines Nahrungsmittelbehälters, wie einer Kochtopf oder ähnliches, auf einer Glaskeramik-Kochmulde Download PDF

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Publication number
EP0620698A1
EP0620698A1 EP93106000A EP93106000A EP0620698A1 EP 0620698 A1 EP0620698 A1 EP 0620698A1 EP 93106000 A EP93106000 A EP 93106000A EP 93106000 A EP93106000 A EP 93106000A EP 0620698 A1 EP0620698 A1 EP 0620698A1
Authority
EP
European Patent Office
Prior art keywords
heating element
region
fed
detection means
electrical
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Withdrawn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
EP93106000A
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English (en)
French (fr)
Inventor
Daniele C/O Whiripool Italia S.R.L. Turetta
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.)
Whirlpool Europe BV
Original Assignee
Whirlpool Europe BV
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 Whirlpool Europe BV filed Critical Whirlpool Europe BV
Priority to EP93106000A priority Critical patent/EP0620698A1/de
Publication of EP0620698A1 publication Critical patent/EP0620698A1/de
Withdrawn legal-status Critical Current

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    • 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
    • F24C15/105—Constructive details concerning the regulation of the temperature
    • 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

Definitions

  • This invention relates to a a device for detecting the presence of a food container such as a saucepan, dish or the like, placed on a cooking region of a hob of glass ceramic or similar material, below which there is positioned in correspondence with the cooking region at least one usual heating element or heat source such as a resistance element, a gas burner, a halogen lamp or the like.
  • a heating element or heat source such as a resistance element, a gas burner, a halogen lamp or the like.
  • Devices for detecting the presence of a container on the cooking region of a glass ceramic hob plate, for the purpose of controlling the operation of the heating element.
  • two elements acting as capacitor plates are provided below said hob plate or silk-screen printed onto it in the cooking region, to define a "capacitive sensor" able to detect the presence of the container in said region by a variation in the capacitance of the capacitor on placing the container on said glass ceramic hob plate.
  • the detecting efficiency of this known device varies with increasing temperature of the cooking region. Specifically, above 150°C the reliability of the device decreases, until above 300°C it becomes totally unreliable. This is because the conductivity of the glass ceramic hob plate increases with increasing temperature, this conductivity falsifying the data obtained from the capacitive sensor.
  • An object of the present invention is to provide a device for detecting the presence of a food container on the cooking region which is reliable in use independently of the temperature reached by said region during food preparation.
  • a further object is to provide a device which is of safe use for the user and results in a considerable energy saving during the use of the glass ceramic cooking hob.
  • a further object is to provide a device which, when the food container is placed on a given cooking region, indicates which knob the user must operate in order to activate the heating element of that particular region.
  • a further object is to provide a device by which the power of the heating element is automatically reduced when the container is removed from the corresponding cooking region, this power being automatically zeroed if the container is not returned to said region within a given time. This results in considerable energy saving and limits the annoying luminosity of this region which occurs when the heating element below it is powered without the container being present on it.
  • a glass ceramic cooking hob is indicated overall by 1 and comprises a plurality of cooking regions 2 (only one of which is shown in Figures 1 and 2) in which at least one usual heating element is provided,
  • a usual halogen lamp 3 and a resistance element 4 are provided in said region 2, the halogen lamp being powered (or not, as the case may be) via a usual power controller of known type, indicated by 5 in Figure 5.
  • Said heating elements 3 and 4 are associated with a usual support 7 comprising thermally insulating walls 8 (see Figures 1 and 2).
  • a part of the device of the invention namely a member 10 for detecting the presence of a food container (such as a metal saucepan, a glass or ceramic dish or the like) on the region 2, is associated with the support 7.
  • the member 10 comprises a cylindrical body 12 with a base diameter D (see Figure 3) considerably smaller than the dimensions of the container or saucepan 11 lying on the region 2 (which in known manner depends on the dimensions of this latter). This results in considerable precision in detecting the presence of the saucepan as this detection is not influenced by the glass ceramic interposed between the member 10 and the saucepan 11.
  • the said body 12, constructed of light material such as aluminium, of the detecting member comprises an upper sensing part 15 defined by a metal layer 16 (for example of aluminium) with which a plurality of conducting elements 18, 19, 20 and 21 are associated (these will be defined as, although the last of them is a disc element in the drawings under examination).
  • Said elements are shown in the example as endless rings provided with projections or stems 18A, B, 19A, B, 20A, B and 21A, B housed in corresponding slots 23 in the layer 16.
  • Usual electrical connection cables 24 are connected to the projections on the elements 18 to 21 to feed electrical signals (such as a voltage) to the elements.
  • the elements 18, 19, 20 and 21 can however be in the form of broken rings, or straight or curved elements placed side by side.
  • the most outer ring 18 and the most inner ring 21 define the plates of a flat capacitor and are fed with sinusoidal signals of identical form, amplitude and frequency, but phase-displaced by 180°. This feed creates an electrical (and magnetic) field which starts from one ring and closes onto the other.
  • the device of the invention comprises ( Figure 8) an oscillator 30 connected to a transformer 31 having two secondary branches 32 and 33, connected at one end to earth at 34 and at their other end to high output impedance members such as buffers 35. These latter are connected to the rings 18 and 21.
  • the rings 19 and 20 are connected to an electrical member of high input impedance such as a buffer or emitter follower 36. This latter generates an output which is fed to a control unit such as a microprocessor circuit 37 (shown in Figure 5) the use of which is described hereinafter.
  • the connection to the buffer 36 is via said coaxial cable, in which the usual central element 26A is connected to the ring 19 and the sheathing 26B is connected to the ring 20.
  • a feedback branch 36A connects the output 36B of the buffer 36 to the sheathing 26B of said cable 26.
  • Figure 9 shows that circuit part which feeds the rings 18 and 21 of the member 10.
  • parts corresponding to those of the already described figures are indicated by the same reference numerals.
  • the oscillator 30 is a usual Colpetts oscillator and is connected to the two buffers 35 which are identical (and hence only one is shown completely) except for the presence of a return branch 40 from the buffer 35 to the oscillator 30, and connected to the ring 21.
  • a signal V A returns to the oscillator via the branch 40, in order, by means of a resistor associated with this latter, to control the amplitude of the signal fed to the buffers 35.
  • the oscillator 30 and the buffers 35 also comprise other usual circuit components and connections (shown) the characteristics and use of which are apparent to the average expert of the art.
  • the members 30 and 35 are therefore not further described.
  • Figure 10 shows the circuit part corresponding to one embodiment of the components for receiving and processing the signals from the ring 19.
  • pacts already described in relation to the preceding figures are indicated by the same reference numerals.
  • the circuit part under examination comprises the buffer 36, and a decoupling stage 47 (defined by a capacitor) to allow passage of the alternating component of a signal V B generated by the buffer, to an alternating current rectifier 48.
  • the signal V B is firstly connected to a direct current source 50, then amplified by an amplifier 51 and then connected to a second direct current source 52.
  • the use of the rectifier 48 enables a continuous signal V U to be obtained at the output of the circuit part of Figure 10, to be then fed to the unit 37 of Figure 5.
  • the use of the current rectifier 48 also limits losses of the signal withdrawn from the ring 19 and enables it to be fed virtually totally to the unit 37 for reliable control of the utilization and operation of the cooking hob 1.
  • circuit parts of Figures 8, 9 and 10 are grouped into the block 60 of Figure 5, connected to the member 10 and to the unit 37. These latter define the device K of the invention.
  • the block 60 also receives signals from another block representing a usual temperature sensor 70 for measuring the temperature of the heating elements and for protecting their integrity in known manner.
  • This sensor passes through a hole 69 in the body 12 of the member 10.
  • the unit 37 is also connected, via an analog/digital converter 71, to said power controller 5, to a display 72 and to the usual knobs 73 for for operating the heating elements of the cooking hob.
  • the ring 19 (and the ring 20) are traversed by an electrical signal generated by induction by the said electrical (and magnetic) field.
  • This signal is withdrawn via the cable 26 and fed to the buffer 36.
  • At the output of this latter there is a sinusoidal signal of the same phase and frequency as the signal present in the ring 18 and with an amplitude which is considered as the reference amplitude by the unit 37 to which this signal is fed.
  • said amplitude is different from that of the signal present in the ring 18. This is because of the normal losses present in the sensor material and because of the influence of the cables 24 and 26 connected to the rings 18, 19, 20 and 21.
  • This amplitude variation is amplified and then transformed by the rectifier 48 of Figure 10 into a different signal V U (from that generated in the absence of the saucepan 11), fed by the block 60 of Figure 5 to the unit 37,
  • This latter measures the difference between the signal V U and the reference signal previously measured (and preferably memorized in a suitable memory area of the unit 37, not shown) in the absence of the saucepan 11, and feeds a signal to the display 72 which, in any known manner, displays the presence of the saucepan on the region 2.
  • a display (such as a light element) is associated with each knob, and if activated tells the user which knob to use in order to activate the heating element corresponding to that region 2 on which the saucepan is present.
  • the unit 37 detects the presence of the saucepan 11 when the signal V U varies suddenly (ie within a predetermined short time interval), said unit therefore detecting independently of comparisons with predetermined reference values. This means that the device does not need to be calibrated before being used on the cooking hob 1.
  • the unit 37 can also enable the operation of the knob in any known manner, for example by closing an electrical contact 80 provided in an electrical branch 81 connecting the knob to the power controller for the corresponding heating element.
  • the food in the saucepan 11 can be subjected to heat.
  • the unit 37 causes the power controller 5 to make the heating element operate at minimum power, and if the saucepan is not returned to the region 2 within a predetermined time period (for example one minute), measured by a usual clock (not shown), the unit 37 switches off the heating element.
  • the aforegoing can be achieved with a heating element of any type (halogen lamp, electrical resistor or gas burner).
  • the power controller 5 must be of a suitable type for the particular type heating element used, such as a solenoid valve (in the case of gas) or a potentiometer (in the case of an electrical resistor), or a usual halogen lamp controller.
  • this is connected to the support 7 via an elastic metal strip 90 (see Figure 2) fixed to said support by usual screws 91.
  • the body 12 of said member is inserted through a through hole 7A in said support and is urged against and maintained in contact with the hob 1 by the elastic strip 90 so as to bring the rings 18, 19, 20 and 21 into contact with said hob.
  • FIG 7 shows a further embodiment of the invention.
  • the temperature sensor 70 is positioned within the body 12 of the member 10, with its usual sensitive part 70A in a central region of the ring 21 and inserted through a hole therein (not shown) so as to make contact with the cooking hob 1.
  • An electric cable 70B feeds the signal from the sensor 70 to the outside of the body 12 of the member 10.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
EP93106000A 1993-04-13 1993-04-13 Vorrichtung zur Anwesenheitserkennung eines Nahrungsmittelbehälters, wie einer Kochtopf oder ähnliches, auf einer Glaskeramik-Kochmulde Withdrawn EP0620698A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP93106000A EP0620698A1 (de) 1993-04-13 1993-04-13 Vorrichtung zur Anwesenheitserkennung eines Nahrungsmittelbehälters, wie einer Kochtopf oder ähnliches, auf einer Glaskeramik-Kochmulde

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP93106000A EP0620698A1 (de) 1993-04-13 1993-04-13 Vorrichtung zur Anwesenheitserkennung eines Nahrungsmittelbehälters, wie einer Kochtopf oder ähnliches, auf einer Glaskeramik-Kochmulde

Publications (1)

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EP0620698A1 true EP0620698A1 (de) 1994-10-19

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EP93106000A Withdrawn EP0620698A1 (de) 1993-04-13 1993-04-13 Vorrichtung zur Anwesenheitserkennung eines Nahrungsmittelbehälters, wie einer Kochtopf oder ähnliches, auf einer Glaskeramik-Kochmulde

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EP (1) EP0620698A1 (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2320573A (en) * 1996-12-19 1998-06-24 Ceramaspeed Ltd Electric heater and sensor
EP0857006A2 (de) * 1997-01-31 1998-08-05 Ceramaspeed Limited Elektrisches Heizverfahren
EP0967839A3 (de) * 1998-06-05 2001-10-31 BSH Bosch und Siemens Hausgeräte GmbH Kochfeld mit Bedieneinheit zur Vorgabe der Leistungsstufe
ES2164595A1 (es) * 2000-03-24 2002-02-16 Eika S Coop Circuito para la deteccion de recipiente en una placa de cocina.
US10145568B2 (en) 2016-06-27 2018-12-04 Whirlpool Corporation High efficiency high power inner flame burner
USD835775S1 (en) 2015-09-17 2018-12-11 Whirlpool Corporation Gas burner
US10551056B2 (en) 2017-02-23 2020-02-04 Whirlpool Corporation Burner base
US10619862B2 (en) 2018-06-28 2020-04-14 Whirlpool Corporation Frontal cooling towers for a ventilation system of a cooking appliance
US10627116B2 (en) 2018-06-26 2020-04-21 Whirlpool Corporation Ventilation system for cooking appliance
DE202020102221U1 (de) 2019-05-03 2020-05-08 Eika, S. Coop. Sensorvorrichtung für einen Heizstrahler
US10660162B2 (en) 2017-03-16 2020-05-19 Whirlpool Corporation Power delivery system for an induction cooktop with multi-output inverters
US10837652B2 (en) 2018-07-18 2020-11-17 Whirlpool Corporation Appliance secondary door
US10837651B2 (en) 2015-09-24 2020-11-17 Whirlpool Corporation Oven cavity connector for operating power accessory trays for cooking appliance
US11777190B2 (en) 2015-12-29 2023-10-03 Whirlpool Corporation Appliance including an antenna using a portion of appliance as a ground plane

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2831858A1 (de) * 1978-07-20 1980-02-07 Licentia Gmbh Elektrische heiz- oder kochplatte fuer herde
DE3711589A1 (de) * 1987-04-06 1988-10-27 Kueppersbusch Kochgeraet
EP0374868A1 (de) * 1988-12-23 1990-06-27 INDUSTRIEELEKTRONIK DR.ING. WALTER KLASCHKA GMBH & CO. Kochfeld
DE3934157A1 (de) * 1989-10-12 1991-04-18 Bosch Siemens Hausgeraete Kochmulde fuer einen elektroherd oder dgl.
EP0429120A2 (de) * 1989-11-17 1991-05-29 Whirlpool Europe B.V. Vorrichtung zur Feststellung des Vorhandenseins eines Kochbehälters auf einer Kochplatte
EP0478081A1 (de) * 1990-09-28 1992-04-01 Laboratoires D'electronique Philips S.A.S. Heizplatte mit automatischer Steuerung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2831858A1 (de) * 1978-07-20 1980-02-07 Licentia Gmbh Elektrische heiz- oder kochplatte fuer herde
DE3711589A1 (de) * 1987-04-06 1988-10-27 Kueppersbusch Kochgeraet
EP0374868A1 (de) * 1988-12-23 1990-06-27 INDUSTRIEELEKTRONIK DR.ING. WALTER KLASCHKA GMBH & CO. Kochfeld
DE3934157A1 (de) * 1989-10-12 1991-04-18 Bosch Siemens Hausgeraete Kochmulde fuer einen elektroherd oder dgl.
EP0429120A2 (de) * 1989-11-17 1991-05-29 Whirlpool Europe B.V. Vorrichtung zur Feststellung des Vorhandenseins eines Kochbehälters auf einer Kochplatte
EP0478081A1 (de) * 1990-09-28 1992-04-01 Laboratoires D'electronique Philips S.A.S. Heizplatte mit automatischer Steuerung

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2320573A (en) * 1996-12-19 1998-06-24 Ceramaspeed Ltd Electric heater and sensor
EP0857006A2 (de) * 1997-01-31 1998-08-05 Ceramaspeed Limited Elektrisches Heizverfahren
EP0857006A3 (de) * 1997-01-31 1998-12-23 Ceramaspeed Limited Elektrisches Heizverfahren
US5977523A (en) * 1997-01-31 1999-11-02 Ceramaspeed Limited Electric heating method
EP0967839A3 (de) * 1998-06-05 2001-10-31 BSH Bosch und Siemens Hausgeräte GmbH Kochfeld mit Bedieneinheit zur Vorgabe der Leistungsstufe
ES2164595A1 (es) * 2000-03-24 2002-02-16 Eika S Coop Circuito para la deteccion de recipiente en una placa de cocina.
ES2178577A1 (es) * 2000-03-24 2002-12-16 Eika S Coop Sensor de recipiente en una placa de cocina, con un circuito de medicion a baja frecuencia.
USD835775S1 (en) 2015-09-17 2018-12-11 Whirlpool Corporation Gas burner
US10837651B2 (en) 2015-09-24 2020-11-17 Whirlpool Corporation Oven cavity connector for operating power accessory trays for cooking appliance
US11460195B2 (en) 2015-09-24 2022-10-04 Whirlpool Corporation Oven cavity connector for operating power accessory trays for cooking appliance
US11777190B2 (en) 2015-12-29 2023-10-03 Whirlpool Corporation Appliance including an antenna using a portion of appliance as a ground plane
US10145568B2 (en) 2016-06-27 2018-12-04 Whirlpool Corporation High efficiency high power inner flame burner
US10551056B2 (en) 2017-02-23 2020-02-04 Whirlpool Corporation Burner base
US10660162B2 (en) 2017-03-16 2020-05-19 Whirlpool Corporation Power delivery system for an induction cooktop with multi-output inverters
US10627116B2 (en) 2018-06-26 2020-04-21 Whirlpool Corporation Ventilation system for cooking appliance
US11226106B2 (en) 2018-06-26 2022-01-18 Whirlpool Corporation Ventilation system for cooking appliance
US10619862B2 (en) 2018-06-28 2020-04-14 Whirlpool Corporation Frontal cooling towers for a ventilation system of a cooking appliance
US11137145B2 (en) 2018-06-28 2021-10-05 Whirlpool Corporation Frontal cooling towers for a ventilation system of a cooking appliance
US10837652B2 (en) 2018-07-18 2020-11-17 Whirlpool Corporation Appliance secondary door
DE202020102221U1 (de) 2019-05-03 2020-05-08 Eika, S. Coop. Sensorvorrichtung für einen Heizstrahler

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