EP1542508B2 - Vorrichtung zur Bestimmung der Position von Kochgefässen auf einer Kochplatte - Google Patents

Vorrichtung zur Bestimmung der Position von Kochgefässen auf einer Kochplatte Download PDF

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Publication number
EP1542508B2
EP1542508B2 EP03028048A EP03028048A EP1542508B2 EP 1542508 B2 EP1542508 B2 EP 1542508B2 EP 03028048 A EP03028048 A EP 03028048A EP 03028048 A EP03028048 A EP 03028048A EP 1542508 B2 EP1542508 B2 EP 1542508B2
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EP
European Patent Office
Prior art keywords
heating elements
conductors
couple
cooking
loops
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
EP03028048A
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English (en)
French (fr)
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EP1542508B1 (de
EP1542508A1 (de
Inventor
Cristiano Pastore
Davide Parachini
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Whirlpool Corp
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Whirlpool Corp
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Application filed by Whirlpool Corp filed Critical Whirlpool Corp
Priority to DE2003608704 priority Critical patent/DE60308704T2/de
Priority to ES03028048T priority patent/ES2272879T5/es
Priority to EP03028048A priority patent/EP1542508B2/de
Publication of EP1542508A1 publication Critical patent/EP1542508A1/de
Publication of EP1542508B1 publication Critical patent/EP1542508B1/de
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00Ohmic-resistance heating
    • H05B3/68Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/746Protection, e.g. overheat cutoff, hot plate indicator
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/03Heating plates made out of a matrix of heating elements that can define heating areas adapted to cookware randomly placed on the heating plate
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/05Heating plates with pan detection means

Definitions

  • the present invention relates to a device for determining the location of cooking utensils on a cooking hob comprising a plurality of heating elements distributed in a matrix pattern below a heat-resistant surface on which the cooking utensil can be placed in a random manner, each heating element being capable of working also as a magnetic field transmitter, the device comprising loops placed substantially around portions of the matrix of heating elements and working as magnetic field receivers.
  • a device of this type is disclosed in EP-A-1206164 .
  • the present invention relates to an improvement of the receiving coil antennae or loops used to pick up the electromagnetic field generated by the heating elements.
  • the invention relates also to some enhancing and cost reduction techniques of the pan detection system for cooking hobs with discrete distributed heating elements as disclosed in EP-A-1303168 .
  • the basic form of said receiving pickup coils or loops is that of one or more coils made of conducing metal wires or the like laying between the glass-ceramic slab and the heating elements.
  • This basic implementation even if it works in a satisfactory manner, nevertheless has some practical and technological problems that are addressed in this invention.
  • the basic known solution presents the following problems:
  • the spatial resolution of the system i.e. the ability of detecting only metallic objects lying just over the heating element and not in its surroundings, is generally poor if the pickup loops are significantly larger than the emitting coils which are also the heating elements.
  • the present invention solves all the above problems, providing a solution that is economical, easy to be produced, robust and guarantees high and reliable detecting performances. It is an object of the present invention to overcome or minimize the problem associated with the conventional pickup loops, providing a cheaper, more reliable and better performing solution.
  • the solution according to the invention solves all said issues by using a conductor (i.e. wire, track or the like) interposed between each couple of adjacent rows or columns of the matrix of heating elements, connecting means being provided for linking each loop to a detection circuit.
  • a conductor i.e. wire, track or the like
  • a pot detection system is based on the cross-inductive principle (or transformer principle), in which each receiving conductor is substantially different than a coil or loop, but it can assume the function of a coil by establishing, for instance by means of electronic multiplexers, a conductive path substantially encircling the magnetic field generated by the emitting coil of the heating element.
  • More than one receiving loop is used in order to detect a magnetically induced voltage, said coils being connected together at one or more points and sharing one or more linear conductors.
  • an electronic multiplexing circuit that can be used to detect -in distinct times- the voltages developed by magnetic induction in two of at least three points of an electrically conducting material, these two points being substantially equivalent to the terminals of a single turn coil enclosing the magnetic field generated by the emitting coil to be sensed.
  • the differential voltage developed at the free ends of each pair of legs is substantially equivalent to the differential voltage that would be developed at the ends of a coil embracing the same area delimited by the two addressed legs and the common conductor.
  • connection of each loop to the detection circuit may be performed through an electronic multiplexing technique in order to realize loop equivalent conducting paths, starting from non coil-shaped conductive paths, in a manner that will be explained in the following detailed description of different embodiments, given by way of non-limiting example, and illustrated in the accompanying drawings, in which:
  • a first embodiment of the invention is realized by creating a single turn pick-up loop or coil over each column of heating elements by sharing a common "leg" 10 between two adjacent columns, the shared leg being connected to the ground reference 5 of the detection circuit 3.
  • Said arrangement has the advantage that the number of vertical conductors is reduced from 2n to 1.5n, being n the number of loops to be sensed.
  • a third embodiment of the present invention can further reduce the number of vertical conductors needed to implement n sensing loops from 1.5n to n+1 .
  • Such embodiment is shown in figure 4 , in which the leg-sharing concept is extended to all the legs but the outer ones.
  • the receiving loops are realized by means of electronic multiplexing of the legs on a comb-shaped conductive structure substituting the regular coils of the previous solutions.
  • Said comb-like structure is made of a common edge 12, and a number of legs 2a,.., 21 substantially running parallel to the rows or the columns of heating elements to be sensed for pot presence.
  • the heating element 6 for sensing pot presence, the heating element 6 is used. As described in the prior art, an alternate current is flown into the coil of the heating element 6, thus generating a magnetic field leaking from the cell as a fountain.
  • the two electronic multiplexers 7a and 7b are addressed by a suitable electronic control, in order to switch into the differential amplifier 8 the two comb legs 2h and 2i adjacent to the cell 6. This is electrically equivalent to have a real loop wound around the column into which lies the cell 6.
  • FIG. 5 A substantially equivalent solution is shown in figure 5 , in which the comb structure is electrically floating and is brought to ground 5 by means of the electronic multiplexer 7b', while the other multiplexer 7a' connects the other leg to a ground referenced amplifier 8' connected to the detection circuitry 9.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • General Induction Heating (AREA)

Claims (4)

  1. Vorrichtung zur Bestimmung des Orts von Kochutensilien auf einem Kochfeld, umfassend eine Vielzahl von Heizelementen, die in einem Matrixmuster unterhalb einer hitzebeständingen Oberfläche, auf der das Kochutensil in einer zufälligen Weise platziert werden kann, verteilt sind, wobei jedes Heizelement in der Lage ist, ebenso als Transmitter oder Empfänger zu arbeiten, wobei die Vorrichtung Schleifen umfasst, die im Wesentlichen um Abschnitte der Matrix von Heizelementen platziert sind und als Empfänger bzw. Transmitter arbeiten, dadurch gekennzeichnet, dass die Schleifen Leiter (10, 2a, ... 2l) umfassen, die zwischen jedem Paar von benachbarten Spalten oder Zeilen der Heizelemente eingesetzt sind, und dass Verbindungselemente zum Verbinden jeder Schleife mit einem Detektions-Schaltkreis (3, 9) vorgesehen sind, das Verbindungselement eine Vielzahl von Massereferenzen (5) umfasst, wobei jede Massereferenz zwischen zwei benachbarten Leitern, die mit dem Detektions-Schaltkreis (3) verbunden sind, eingesetzt ist.
  2. Vorrichtung zur Bestimmung des Orts von Kochutensilien auf einem Kochfeld, umfassend eine Vielzahl von Heizelementen, die in einem Matrixmuster unterhalb einer hitzebeständingen Oberfläche, auf das Kochutensil in einer zufälligen Weise platziert werden kann, verteilt sind wobei jedes Heizelement in der Lage ist, ebenso als Transmitter oder Empfänger zu arbeiten, wobei die Vorrichtung Schleifen umfasst, die im Wesentlichen um Abschnitte der Matrix von Heizelementen platziert sind und als Empfänger bzw. Transmitter arbeiten, dadurch gekennzeichnet, dass die Schleifen Leiter (10, 2a, ... 2l) umfassen, die zwischen jedem Paar von benachbarten Spalten oder Zeilen der Heizelemente eingesetzt sind, und dass Verbindungselemente zum Verbinden jeder Schleife mit einem Detektions-Schaltkreis (3, 9) vorgesehen sind, das Verbindungselement eine Vielzahl von Differenzial-Empfänger (3'), Paaren von ersten Leitern (11a, 11 b), die mit der Eingabeseite von zwei benachbarten Differenzial-Empfänger (3) verbunden sind, zweite Leiter (10), die zwischen dem Paar von ersten Leitern (11 a, 11 b), die jeweils mit zwei Eingabeseiten der benachbarten Differenzial-Empfänger (3') verbunden sind, eingesetzt ist, umfasst.
  3. Vorrichtung zur Bestimmung des Ortes von Kochutensilien auf einem Kochfeld, umfassend eine Vielzahl von Heizelementen, die in einem Matrixmuster unterhalb einer hitzebeständingen Oberfläche, auf das Kochutensil in einer zufälligen Weise platziert werden kann, verteilt sind wobei jedes Heizelement in der Lage ist, ebenso als Transmitter oder Empfänger zu arbeiten, wobei die Vorrichtung Schleifen umfasst, die im Wesentlichen um Abschnitte der Matrix von Heizelementen platziert sind und als Empfänger bzw. Transmitter arbeiten, dadurch gekennzeichnet, dass die Schleifen Leiter (10, 2a, ... 2l) umfassen, die zwischen jedem Paar von benachbarten Spalten oder Zeilen der Heizelemente eingesetzt sind, und dass Verbindungselemente zum Verbinden jeder Schleife mit einem Detektions-Schaltkreis (3, 9) vorgesehen sind, dass das Verbindungselement ein Paar von Multiplexern (7a, 7b) umfasst, die dazu geeignet sind, nacheinander das erste Ende jedes Paars einzelner der aufeinander folgenden Leiter (2a, ...21) mit dem Detektions-Schaltkreis (8, 9) zu vernetzen, um die gesamte Matrix zu scannen, wobei die zweiten Enden (12) derartiger Leiter sämtlich miteinander verbunden sind.
  4. Vorrichtung zur Bestimmung des Ortes von Kochutensilien auf einem Kochfeld, umfassend eine Vielzahl von Heizelementen, die in einem Matrixmuster unterhalb einer hitzebeständingen Oberfläche, auf das Kochutensil in einer zufälligen Weise platziert werden kann, verteilt sind wobei jedes Heizelement in der Lage ist, ebenso als Transmitter oder Empfänger zu arbeiten, wobei die Vorrichtung Schleifen umfasst, die im Wesentlichen um Abschnitte der Matrix von Heizelementen platziert sind und als Empfänger bzw. Transmitter arbeiten, dadurch gekennzeichnet, dass die Schleifen Leiter (10, 2a, ... 21) umfassen, die zwischen jedem Paar von benachbarten Spalten oder Zeilen der Heizelemente eingesetzt sind, und dass Verbindungselemente zum Verbinden jeder Schleife mit einem Detektions-Schaltkreis (3, 9) vorgesehen sind, dass das Verbindungselement ein Paar von Multiplexern (7b', 7a') umfasst, die dazu geeignet sind, nacheinander das erste Ende jedes Paars einzelner der aufeinander folgenden Leiter mit der Masse (5) bzw. dem Detektions-Schaltkreis (8', 9) zu vernetzen, um die gesamte Matrix zu scannen, wobei die zweiten Enden (12) derartiger Leiter sämtlich miteinander verbunden sind.
EP03028048A 2003-12-08 2003-12-08 Vorrichtung zur Bestimmung der Position von Kochgefässen auf einer Kochplatte Expired - Lifetime EP1542508B2 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE2003608704 DE60308704T2 (de) 2003-12-08 2003-12-08 Vorrichtung zur Bestimmung der Position von Kochgefässen auf einer Kochplatte
ES03028048T ES2272879T5 (es) 2003-12-08 2003-12-08 Un dispositivo para determinar la posición de utensilios de cocina sobre una placa de cocina.
EP03028048A EP1542508B2 (de) 2003-12-08 2003-12-08 Vorrichtung zur Bestimmung der Position von Kochgefässen auf einer Kochplatte

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03028048A EP1542508B2 (de) 2003-12-08 2003-12-08 Vorrichtung zur Bestimmung der Position von Kochgefässen auf einer Kochplatte

Publications (3)

Publication Number Publication Date
EP1542508A1 EP1542508A1 (de) 2005-06-15
EP1542508B1 EP1542508B1 (de) 2006-09-27
EP1542508B2 true EP1542508B2 (de) 2010-10-20

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EP03028048A Expired - Lifetime EP1542508B2 (de) 2003-12-08 2003-12-08 Vorrichtung zur Bestimmung der Position von Kochgefässen auf einer Kochplatte

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EP (1) EP1542508B2 (de)
DE (1) DE60308704T2 (de)
ES (1) ES2272879T5 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100925033B1 (ko) * 2005-06-29 2009-11-04 와틀로 일렉트릭 매뉴팩츄어링 컴파니 스마트 적층형 히터면
DE102009020628A1 (de) 2009-05-09 2010-11-11 Hettich Holding Gmbh & Co. Ohg Kochfeld und Verfahren zum Erhitzen von auf dem Kochfeld aufgestellten Kochgefäßen
ES2382431B1 (es) * 2009-07-29 2013-05-08 BSH Electrodomésticos España S.A. Aparato de coccion con al menos dos zonas de calentamiento
CN102609017B (zh) * 2012-03-01 2014-06-11 大连理工大学 一种在金属翼形结构上产生可控温度梯度场的加热装置和方法
TR201602883A2 (tr) 2016-03-04 2017-09-21 Arcelik As İndüksi̇yon isiticili ocak güç kontrol devresi̇
ES2673130B1 (es) * 2016-12-19 2019-03-28 Bsh Electrodomesticos Espana Sa Dispositivo de aparato domestico de coccion por induccion con una matriz de elementos de calentamiento
TR201721881A2 (tr) 2017-12-26 2019-07-22 Arcelik As Yüksek frekans üreteci̇ i̇le beslenen bobi̇n i̇çeren bi̇r metal algilama si̇stemi̇

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4484048A (en) 1981-07-10 1984-11-20 Cem Compagnie Electro-Mecanique Process and apparatus for the homogeneous, electromagnetic induction heating with transverse flux of conducting and non-magnetic flat products
DE3327622A1 (de) 1983-07-30 1985-02-07 Blanc Gmbh & Co, 7519 Oberderdingen Elektrische heizplatte fuer ein glaskeramik-kochfeld
JPS618615A (ja) 1984-06-23 1986-01-16 Yoshio Shimizu 物体の位置検出・追跡装置
DE19643698A1 (de) 1996-05-11 1997-11-13 Aeg Hausgeraete Gmbh Vorrichtung zur Abschirmung von für kapazitive Messungen verwendeten Leiterbahnen eines Kochfeldes
DE10048254C1 (de) 2000-09-29 2001-09-20 Schott Glas Einrichtung zur Topferkennung für Kochfelder mit einer Glaskeramikplatte
DE10033361A1 (de) 2000-07-08 2002-01-24 Thomas Wartmann Matrix-Kochfeld

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4007680A1 (de) * 1990-03-10 1991-09-19 Grass Ag Heizplatte
DK0862714T3 (da) * 1995-11-21 2003-06-02 Electrolux Ab Madlavningsoverflade med styreorganer
IT1319292B1 (it) * 2000-11-08 2003-10-10 Whirlpool Co Dispositivo per rilevare la collocazione di utensili di cottura su unpiano di cottura ad elementi riscaldanti discreti e distribuiti.
US6693262B2 (en) * 2001-10-17 2004-02-17 Whirlpool Corporation Cooking hob with discrete distributed heating elements

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4484048A (en) 1981-07-10 1984-11-20 Cem Compagnie Electro-Mecanique Process and apparatus for the homogeneous, electromagnetic induction heating with transverse flux of conducting and non-magnetic flat products
DE3327622A1 (de) 1983-07-30 1985-02-07 Blanc Gmbh & Co, 7519 Oberderdingen Elektrische heizplatte fuer ein glaskeramik-kochfeld
JPS618615A (ja) 1984-06-23 1986-01-16 Yoshio Shimizu 物体の位置検出・追跡装置
DE19643698A1 (de) 1996-05-11 1997-11-13 Aeg Hausgeraete Gmbh Vorrichtung zur Abschirmung von für kapazitive Messungen verwendeten Leiterbahnen eines Kochfeldes
DE10033361A1 (de) 2000-07-08 2002-01-24 Thomas Wartmann Matrix-Kochfeld
DE10048254C1 (de) 2000-09-29 2001-09-20 Schott Glas Einrichtung zur Topferkennung für Kochfelder mit einer Glaskeramikplatte

Also Published As

Publication number Publication date
DE60308704D1 (de) 2006-11-09
EP1542508B1 (de) 2006-09-27
ES2272879T5 (es) 2011-03-18
ES2272879T3 (es) 2007-05-01
EP1542508A1 (de) 2005-06-15
DE60308704T2 (de) 2007-08-16

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