EP1087640A2 - Pot presence and size detection - Google Patents
Pot presence and size detection Download PDFInfo
- Publication number
- EP1087640A2 EP1087640A2 EP00119241A EP00119241A EP1087640A2 EP 1087640 A2 EP1087640 A2 EP 1087640A2 EP 00119241 A EP00119241 A EP 00119241A EP 00119241 A EP00119241 A EP 00119241A EP 1087640 A2 EP1087640 A2 EP 1087640A2
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- EP
- European Patent Office
- Prior art keywords
- heating element
- hotplate
- resistance heating
- resonant circuit
- cooking vessel
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- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 71
- 238000010411 cooking Methods 0.000 claims abstract description 21
- 239000003990 capacitor Substances 0.000 claims description 16
- 238000011156 evaluation Methods 0.000 claims description 11
- 239000002241 glass-ceramic Substances 0.000 claims description 4
- 230000001939 inductive effect Effects 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- 239000013256 coordination polymer Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000010292 electrical insulation Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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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
- H05B3/74—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
Definitions
- the invention relates to a device for detecting the presence and / or the size of a cooking vessel on an electrically heated hotplate after Preamble of claim 1.
- DE 196 46 826 A1 discloses a pot detection in which capacitive Sensors are used, which are formed by several electrodes are also located between the heating conductor and the hotplate and with which an electrical one Resonant circuit is operated. When placing a saucepan on the hotplate the capacitance of these sensors changes and thus the resonance frequency of the resonant circuit.
- pot detection Sensors necessary which are in the hob or between the heating conductor and Hotplate are arranged. These sensors must be designed so that they tolerate the high temperatures in the cooking zone. In addition, measures need to be taken be taken that these sensors the electrical insulation system Do not disturb the heating pan. Pot detection with such is also suitable Sensors not for use with hotplates, on the underside of which electrical resistance heating (via an insulating layer) is applied directly without that an air gap is created in which these sensors are housed could.
- the present invention The task is to implement a simple pot detection, which does not have the disadvantages mentioned above.
- the resistance heating element itself as a capacitive sensor for the pan detection is an additional sensor, which in the system hotplate resistance heating should be accommodated, not necessary. So is an impairment of the electrical insulation system of the heating pot excluded from the outset. In addition, there is also an air gap between the heating element and hot plate not necessary, and the heating element can be in direct Be brought into contact with the hotplate. In addition, the effort for the attachment and wiring of an additional pan detection sensor.
- the invention is preferably designed such that the capacitance of the resistance heating element against a reference potential, preferably against earth, in an electrical resonant circuit is connected that the resonance frequency of this Resonant circuit can be detected by an evaluation unit and so that the presence and / or the size of a cooking vessel can be determined on the hotplate.
- the resistance heating element is preferably via electrical switching means, preferably Chokes, connected to the heating voltage supply and another electrical switching means, preferably an isolating capacitor, in the Resonant circuit switched.
- the resonant circuit includes the resistance heating element, the separation capacitor, an inductive element, preferably a coil, and the reference potential.
- a capacitor is connected between the electrical connections of the resistance heating element a capacitor is connected.
- the heating element forming the corresponding heating circuit in each case is used as a capacitive sensor for pot detection.
- the hotplate is made of ceramic or glass ceramic there is that the resistance heating element is a radiant heater, a foil heating element or is a heating layer or heating track applied to a carrier and that the resistance heating element has line windings or a flat ribbon.
- the value or the change in the resonant frequency of the resonant circuit is the size of a standing on the hotplate or the degree of coverage of the The cooking plate can be recognized by the evaluation unit through a cooking vessel.
- the invention relates to a device for pot detection, with which it is not only possible to determine whether a cooking vessel is on the hotplate stands or not, but also how much of the surface of the hob of one Cooking vessel is covered, whether a large or a small cooking vessel on the hotplate stands and whether it stands on it in the middle or laterally.
- a device for pot detection has an electrically heated one Resistance heating element 1 on the hotplate (FIG. 1). This is over two Lines 2, 3 to an electrical heating voltage supply with 230 volt alternating current connected. In lines 2, 3 there are two chokes DR1 and DR2 switched. These have one for the low-frequency heating voltage (50 or 60 Hz) low impedance, so the heating current can flow almost unhindered.
- a coil in the branch point 4 via an isolating capacitor CN L connected, which on the other hand is connected to the housing 5 and to earth is.
- the resistance heating element 1 or its capacity to the grounded Housing 5, the separating capacitor CN, the coil L and earth a resonant circuit.
- the isolating capacitor CN has a very high impedance for low frequencies, a very low one for high frequencies. In doing so, he prevents the low-frequency 230 volt supply voltage is short-circuited to earth. On the other hand, it lets high-frequency currents, such as occur in such resonant circuits, happen almost unhindered. Thus, the separation capacitor CN separates the Resonant circuit effective from the heating circuit.
- the chokes DR1 and DR2 have for the high frequencies of the resonant circuit a high impedance so that these high frequencies do not get into the power grid can.
- a capacitor CP is connected on the side of the chokes DR1 and DR2. This in turn has a very high impedance for the low-frequency supply voltage, do not let the heating current through; however, for high frequencies (i.e. for the resonant circuit) has a very low impedance, this leaves it unimpeded by.
- the interposition of the capacitor CP shows that both connections of the resistance heating element 1 for the high frequencies of the resonant circuit are at the same potential and so the entire area of the heating element 1 can be used as a capacitance-forming capacitor area.
- FIG. 2 shows an equivalent circuit diagram of the resonant circuit from FIG. 1, which - like mentioned above - is separated from the low-frequency heating circuit.
- CH designated the capacity of the heating element 1 against earth. This capacity CH changes - as will be explained in more detail below - when a saucepan 6 is placed on the hotplate With this change in capacitance of CH, the resonance frequency also changes of the resonant circuit.
- FIG. 3 outlines how the capacitance CH of the resistance heating element 1 against earth.
- the heating element 1 is embedded in an insulating layer 7, in the housing 5. There is a glass ceramic plate above the heating element 1 8, on which the saucepan 6 is placed.
- the resistance heating element 1 has on the one hand, a capacitance against the grounded housing 5, that is, against earth. This capacity is called CG.
- the heating element 1 has also has a capacitance CT compared to the saucepan 6.
- the saucepan 6 in turn has also a capacity against earth, which is designated CE.
- the resonance frequency of the resonant circuit can be detected by an evaluation unit. So it can Evaluation unit (not shown) the voltage in the resonant circuit at the connection points A1 or A2 (each against earth) or between points A3 and tap A4. Ports A3 and A4 are one with the two ends Coil L'connected, which is coupled to the coil L of the resonant circuit. Thereby becomes a transmission of the oscillation, i.e. the frequency of the oscillating circuit to the evaluation unit with simultaneous galvanic isolation.
- the signals transmitted in this way are evaluated in the evaluation unit general state of the art.
- the frequency of the resonant circuit can be adjusted be determined by e.g. B. the vibrations in a certain time interval be counted. Differential methods are also conceivable in which is directly recognized when the resonant circuit by setting up, moving or Removing a cooking vessel is out of tune. Using the size of the frequency change of the resonant circuit can be recognized in the evaluation unit is the size of the cooking vessel or how far a cooking vessel is on the hotplate is pushed on or pulled away from the hotplate.
- the respective heating circuit can be used as a separate sensor and so the size of the pot can be determined. It but can also have several, from the respective heating voltage supply Separating capacitors interconnected heating elements to form a capacitive sensor become. In this case, the size of the pot placed determined by the measure of the frequency change in the resonant circuit.
- the evaluation unit sends appropriate signals to a control unit for the hotplate, which then e.g. B. switches off the heating when there is no cooking vessel on the hotplate In the presence of a small pot, only switch on the inner heating circuit when present a large pot switches on both heating circuits or the heating too then turns off when the cooking vessel is too far from the central position on the The hotplate is pushed away.
- the control unit can also be set in this way that they ignore the signals of the evaluation unit of the pan detection and the heating is regulated solely according to the specified setting values.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Cookers (AREA)
- Electric Stoves And Ranges (AREA)
- Induction Heating Cooking Devices (AREA)
- Geophysics And Detection Of Objects (AREA)
- Traffic Control Systems (AREA)
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zur Erkennung der Anwesenheit und/oder der Größe eines Kochgefäßes auf einer elektrisch beheizten Kochplatte nach dem Oberbegriff des Anspruches 1.The invention relates to a device for detecting the presence and / or the size of a cooking vessel on an electrically heated hotplate after Preamble of claim 1.
Solche Topferkennungs-Vorrichtungen sind weithin bekannt. So wird in der EP 0 788 293 A1 ein elektrischer Strahlungsheizkörper mit einer Topferkennung beschrieben, bei welcher ein induktiver Sensor in Form einer Schleife aus dickem Draht verwendet wird, die in dem Luftraum zwischen Heizleiter und Kochplatte angebracht ist und als induktives Element eines Schwingkreises dient, dessen Resonanzfrequenz sich bei Aufstellen eines Topfes auf die Kochplatte durch Änderung der Induktivitat der Drahtschleife verschiebt.Such pot detection devices are well known. So in EP 0 788 293 A1 describes an electric radiant heater with a pot detection, where an inductive sensor in the form of a loop made of thick Wire is used in the air space between the heating conductor and the hotplate is attached and serves as an inductive element of a resonant circuit, the resonance frequency when changing a pot on the hotplate the inductance of the wire loop shifts.
In der DE 196 46 826 A1 ist eine Topferkennung offenbart, bei welcher kapazitive Sensoren verwendet werden, die durch mehrere Elektroden gebildet sind, sich ebenfalls zwischen Heizleiter und Kochplatte befinden und mit denen ein elektrischer Schwingkreis betrieben wird. Bei Aufsetzen eines Topfes auf die Kochplatte ändert sich die Kapazität dieser Sensoren und somit auch die Resonanzfrequenz des Schwingkreises.DE 196 46 826 A1 discloses a pot detection in which capacitive Sensors are used, which are formed by several electrodes are also located between the heating conductor and the hotplate and with which an electrical one Resonant circuit is operated. When placing a saucepan on the hotplate the capacitance of these sensors changes and thus the resonance frequency of the resonant circuit.
In der DE 39 34 157 A1 ist eine Kochmulde beschrieben, bei der zur Erkennung der Stellfläche unterschiedlich großer Kochgefäße in der Kochmulde mehrere Fühler angebracht sind. Als Fühler sind kapazitive, den Wärmefluß messende, die von Heizung und Kochplatte ausgehende Strahlung messende oder Ultraschall-Sensoren vorgesehen. DE 39 34 157 A1 describes a hob with which to detect the space of different sized cooking vessels in the hob several Sensors are attached. Capacitors that measure the heat flow are the sensors Radiation measuring or ultrasonic sensors emanating from heating and hotplate intended.
Bei der in der EP 0 553 425 B1 offenbarten Topferkennung wird als Sensor ein elektrischer Leiter verwendet, welcher eine offene Schleife bildet und zwischen Heizelement und Kochplatte angebracht ist. Bei Aufsetzen eines Topfes auf die Kochplatte ändert sich die Leitfähigkeit dieses Sensors.In the pot detection disclosed in EP 0 553 425 B1, a is used as the sensor electrical conductor used, which forms an open loop and between Heating element and hot plate is attached. When placing a pot on the Hotplate changes the conductivity of this sensor.
In dem beschriebenen Stand der Technik sind für die Topferkennung stets spezielle Sensoren notwendig, welche in der Kochmulde bzw. zwischen Heizleiter und Kochplatte angeordnet sind. Diese Sensoren müssen so ausgebildet sein, daß sie die hohen Temperaturen der Kochzone vertragen. Darüber hinaus müssen Maßnahmen getroffen werden, daß diese Sensoren das elektrische Isolationssystem Beheizung-Kochtopf nicht stören. Zudem eignet sich eine Topferkennung mit solchen Sensoren nicht zur Verwendung bei Kochplatten, an deren Unterseite die elektrische Widerstandsbeheizung (über eine Isolierschicht) direkt anliegt, ohne daß ein Luftzwischenraum entsteht, in dem diese Sensoren untergebracht werden könnten.In the prior art described there are always special ones for pot detection Sensors necessary which are in the hob or between the heating conductor and Hotplate are arranged. These sensors must be designed so that they tolerate the high temperatures in the cooking zone. In addition, measures need to be taken be taken that these sensors the electrical insulation system Do not disturb the heating pan. Pot detection with such is also suitable Sensors not for use with hotplates, on the underside of which electrical resistance heating (via an insulating layer) is applied directly without that an air gap is created in which these sensors are housed could.
Ausgehend von diesem Stand der Technik liegt der vorliegenden Erfindung die Aufgabe zugrunde, eine einfach aufgebaute Topferkennung zu verwirklichen, welche die oben genannten Nachteile nicht aufweist.Based on this prior art, the present invention The task is to implement a simple pot detection, which does not have the disadvantages mentioned above.
Diese Aufgabe wird durch eine Vorrichtung zur Topferkennung mit den Merkmalen des Patentanspruches 1 gelöst. Ausführungsformen und Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.This object is achieved by a device for pot detection with the features of claim 1 solved. Embodiments and developments of Invention result from the subclaims.
Durch die Verwendung des Widerstandsheizelementes selbst als kapazitiver Sensor für die Topferkennung ist ein zusätzlicher Sensor, der in dem System Kochplatte-Widerstandsbeheizung untergebracht werden müßte, nicht notwendig. Somit ist eine Beeinträchtigung des elektrischen Isolationssystems Beheizung-Kochtopf von vornherein ausgeschlossen. Darüber hinaus ist auch ein Luftspalt zwischen Heizelement und Kochplatte nicht notwendig, und das Heizelement kann in direkten Kontakt mit der Kochplatte gebracht werden. Außerdem entfällt der Aufwand für die Befestigung und Verdrahtung eines zusätzlichen Topferkennungssensors. By using the resistance heating element itself as a capacitive sensor for the pan detection is an additional sensor, which in the system hotplate resistance heating should be accommodated, not necessary. So is an impairment of the electrical insulation system of the heating pot excluded from the outset. In addition, there is also an air gap between the heating element and hot plate not necessary, and the heating element can be in direct Be brought into contact with the hotplate. In addition, the effort for the attachment and wiring of an additional pan detection sensor.
Vorzugsweise ist die Erfindung so ausgeführt, daß die Kapazität des Widerstandsheizelementes gegen ein Referenzpotential, vorzugsweise gegen Erde, in einen elektrischen Schwingkreis geschaltet ist, daß die Resonanzfrequenz dieses Schwingkreises von einer Auswerteeinheit erfaßbar ist und daß so die Anwesenheit und/oder die Größe eines Kochgefäßes auf der Kochplatte ermittelbar ist.The invention is preferably designed such that the capacitance of the resistance heating element against a reference potential, preferably against earth, in an electrical resonant circuit is connected that the resonance frequency of this Resonant circuit can be detected by an evaluation unit and so that the presence and / or the size of a cooking vessel can be determined on the hotplate.
Das Widerstandsheizelement ist bevorzugt über elektrische Schaltmittel, vorzugsweise Drosseln, an die Heizspannungsversorgung angeschlossen und über ein weiteres elektrisches Schaltmittel, vorzugsweise einen Trennkondensator, in den Schwingkreis geschaltet. In vorteilhafter Ausbildung beinhaltet der Schwingkreis das Widerstandsheizelement, den Trennkondensator, ein induktives Element, vorzugsweise eine Spule, und das Referenzpotential. Darüber hinaus ist bevorzugt vorgesehen, daß zwischen die elektrischen Anschlüsse des Widerstandsheizelementes ein Kondensator geschaltet ist.The resistance heating element is preferably via electrical switching means, preferably Chokes, connected to the heating voltage supply and another electrical switching means, preferably an isolating capacitor, in the Resonant circuit switched. In an advantageous embodiment, the resonant circuit includes the resistance heating element, the separation capacitor, an inductive element, preferably a coil, and the reference potential. In addition, is preferred provided that between the electrical connections of the resistance heating element a capacitor is connected.
Bei Mehrkreiskochplatten sind in Weiterbildung der Erfindung mehrere Schwingkreise verwendbar, wobei jeweils das den entsprechenden Heizkreis bildende Heizelement als kapazitiver Sensor für die Topferkennung verwendet ist.In the case of multi-circuit hotplates, in a further development of the invention, several resonant circuits can be used, the heating element forming the corresponding heating circuit in each case is used as a capacitive sensor for pot detection.
Weiterhin ist vorgesehen, daß die Kochplatte aus Keramik oder aus Glaskeramik besteht, daß das Widerstandsheizelement ein Strahlungsheizkörper, ein Folienheizelement oder eine auf einem Träger aufgebrachte Heizschicht bzw. Heizbahn ist und daß das Widerstandsheizelement Leitungswicklungen oder ein Flachband aufweist.It is also provided that the hotplate is made of ceramic or glass ceramic there is that the resistance heating element is a radiant heater, a foil heating element or is a heating layer or heating track applied to a carrier and that the resistance heating element has line windings or a flat ribbon.
Die Verwendung eines Flachbandheizkörpers, eines Folienheizelementes, einer Heizschicht oder Heizbahn ist für die Erfindung besonders günstig, da ein solches flaches Heizelement besonders gut als kapazitives Element geeingnet ist.The use of a flat ribbon heater, a foil heater, one Heating layer or heating track is particularly favorable for the invention, since such flat heating element is particularly well suited as a capacitive element.
In bevorzugter Ausführungsform der Erfindung ist aufgrund des Wertes oder aufgrund der Änderung der Resonanzfrequenz des Schwingkreises die Größe eines auf der Kochplatte stehenden Kochgefäßes bzw. das Maß der Bedeckung der Kochplatte durch ein Kochgefäß von der Auswerteeinheit erkennbar. In a preferred embodiment of the invention is based on the value or the change in the resonant frequency of the resonant circuit is the size of a standing on the hotplate or the degree of coverage of the The cooking plate can be recognized by the evaluation unit through a cooking vessel.
Hier sei angemerkt, daß die Erfindung eine Vorrichtung zur Topferkennung betrifft, mit welcher nicht nur feststellbar ist, ob ein Kochgefäß auf der Kochplatte steht oder nicht, sondern auch, wie viel der Oberfläche der Kochplatte von einem Kochgefäß bedeckt ist, ob ein großes oder ein kleines Kochgefäß auf der Kochplatte steht und ob es mittig oder seitlich verschoben darauf steht.It should be noted here that the invention relates to a device for pot detection, with which it is not only possible to determine whether a cooking vessel is on the hotplate stands or not, but also how much of the surface of the hob of one Cooking vessel is covered, whether a large or a small cooking vessel on the hotplate stands and whether it stands on it in the middle or laterally.
Anhand der Zeichnungen wird im folgenden eine Ausführungsform der Erfindung näher erläutert, ohne daß die Erfindung auf eine solche Ausführungsform beschränkt sein soll.An embodiment of the invention will be described below with reference to the drawings explained in more detail without the invention being limited to such an embodiment should be.
Es zeigen:
- Figur 1
- einen Schaltplan einer erfindungsgemäßen Topferkennung,
Figur 2- ein Ersatzschaltbild des Schwingkreises aus Figur 1,
- Figur 3
- eine Prinzipskizze zur Ermittlung der verschiedenen Kapazitäten und
- Figur 4
- ein erweitertes Ersatzschaltbild des Schwingkreises aus
Figur 2.
- Figure 1
- a circuit diagram of a pot detection according to the invention,
- Figure 2
- 2 shows an equivalent circuit diagram of the resonant circuit from FIG. 1,
- Figure 3
- a schematic diagram to determine the different capacities and
- Figure 4
- an expanded equivalent circuit diagram of the resonant circuit from Figure 2.
Eine Vorrichtung zur Topferkennung weist ein unter einer elektrisch beheizten
Kochplatte befindliches Widerstandsheizelement 1 auf (Fig. 1). Dieses ist über zwei
Leitungen 2, 3 an eine elektrische Heizspannungsversorgung mit 230 Volt Wechselstrom
angeschlossen. In die Leitungen 2, 3 sind zwei Drosseln DR1 und DR2
geschaltet. Diese haben für die niederfrequente Heizspannung (50 bzw. 60 Hz) eine
geringe Impedanz, lassen also den Heizstrom nahezu ungehindert fließen. An der
Leitung 3 ist im Abzweigungspunkt 4 über einen Trennkondensator CN eine Spule
L angeschlossen, welche andererseits mit dem Gehäuse 5 und mit Erde verbunden
ist. Somit bilden das Widerstandsheizelement 1 bzw. seine Kapazität zum geerdeten
Gehäuse 5, der Trennkondensator CN, die Spule L und Erde einen Schwingkreis.A device for pot detection has an electrically heated one
Resistance heating element 1 on the hotplate (FIG. 1). This is over two
Der Trennkondensator CN hat für niedrige Frequenzen eine sehr hohe Impedanz,
für hohe Frequenzen dagegen eine sehr niedrige. Dadurch verhindert er, daß die
niederfrequente 230-Volt-Versorgungsspannung gegen Erde kurzgeschlossen ist.
Andererseits läßt er hochfrequente Ströme, wie sie in solchen Schwingkreisen auftreten,
nahezu ungehindert passieren. Somit trennt der Trennkondensator CN den
Schwingkreis wirksam von dem Heizstromkreis. The isolating capacitor CN has a very high impedance for low frequencies,
a very low one for high frequencies. In doing so, he prevents the
low-
Die Drosseln DR1 und DR2 haben für die hohen Frequenzen des Schwingkreises eine hohe Impedanz, so daß diese hohen Frequenzen nicht ins Stromnetz gelangen können.The chokes DR1 and DR2 have for the high frequencies of the resonant circuit a high impedance so that these high frequencies do not get into the power grid can.
Zwischen die Leitungen 2 und 3 ist auf der von der Versorgungsspannung abgewandten
Seite der Drosseln DR1 und DR2 ein Kondensator CP geschaltet. Dieser
hat wiederum für die niederfrequente Versorgungsspannung eine sehr hohe Impedanz,
laßt also den Heizstrom nicht durch; er hat jedoch für hohe Frequenzen (also
für die des Schwingkreises) eine sehr geringe Impedanz, läßt diese demnach ungehindert
durch. Die Zwischenschaltung des Kondensators CP ergibt, daß beide Anschlüsse
des Widerstandsheizelementes 1 für die hohen Frequenzen des Schwingkreises
auf gleichem Potential liegen und so die gesamte Fläche des Heizelementes
1 als kapazitätsbildende Kondensatorfläche genutzt werden kann.Between
In Figur 2 ist ein Ersatzschaltbild des Schwingkreises aus Fig. 1 gezeigt, der - wie oben erwähnt - vom niederfrequenten Heizstromkreis getrennt ist. CH bezeichnet die Kapazität des Heizelementes 1 gegen Erde. Diese Kapazität CH ändert sich - wie weiter unten näher erläutert wird -, wenn ein Kochtopf 6 auf die Kochplatte gestellt wird, Mit dieser Kapazitätsänderung von CH ändert sich auch die Resonanzfrequenz des Schwingkreises.FIG. 2 shows an equivalent circuit diagram of the resonant circuit from FIG. 1, which - like mentioned above - is separated from the low-frequency heating circuit. CH designated the capacity of the heating element 1 against earth. This capacity CH changes - as will be explained in more detail below - when a saucepan 6 is placed on the hotplate With this change in capacitance of CH, the resonance frequency also changes of the resonant circuit.
In Figur 3 ist skizziert, wie sich die Kapazität CH des Widerstandsheizelementes 1
gegen Erde zusammensetzt. Das Heizelement 1 liegt, eingebettet in eine Isolierschicht
7, in dem Gehäuse 5. Über dem Heizelement 1 befindet sich eine Glaskeramikplatte
8, auf welcher der Kochtopf 6 steht. Das Widerstandsheizelement 1 hat
nun zum einen eine Kapazität gegen das geerdete Gehäuse 5, also gegen Erde.
Diese Kapazität ist mit CG bezeichnet. Zum anderen hat das Heizelement 1 aber
auch eine Kapazität CT gegenüber dem Kochtopf 6. Der Kochtopf 6 wiederum hat
ebenfalls eine Kapazität gegen Erde, welche mit CE bezeichnet ist.FIG. 3 outlines how the capacitance CH of the resistance heating element 1
against earth. The heating element 1 is embedded in an insulating layer
7, in the
In Figur 4 ist das Ersatzschaltbild des Schwingkreises gezeigt, wobei die Kapazitäten CG, CT und CE aus Figur 3 die Kapazität CH aus Figur 2 ersetzen. Hier wird nun auch deutlich, warum CH eine veränderliche Kapazität ist: Wenn der Kochtopf 6 von der Kochplatte genommen wird oder auch nur auf der Glaskeramikplatte 8 seitlich verschoben wird, ändert sich die Kapazität CT zwischen Widerstandsheizelement 1 und Kochtopf 6. Somit ist also CT die Kapazität, die für eine Veränderung der Gesamtkapazität CH zwischen Heizelement 1 und Erde bei Hinstellen oder Wegnehmen eines Kochtopfes 6 und damit eine Veränderung der Resonanzfrequenz des Schwingkreises bewirkt.In Figure 4, the equivalent circuit of the resonant circuit is shown, the capacities CG, CT and CE from FIG. 3 replace the capacitance CH from FIG. 2. Here will now also clear why CH is a variable capacity: when the saucepan 6 is removed from the hotplate or only on the glass ceramic plate 8 is shifted laterally, the capacitance CT changes between the resistance heating element 1 and saucepan 6. So CT is the capacity for a change the total capacitance CH between heating element 1 and earth when placed or removing a saucepan 6 and thus a change in the resonance frequency of the resonant circuit.
In Figur 4 sind weiterhin mehrere Möglichkeiten aufgezeigt, wie die Resonanzfrequenz des Schwingkreises durch eine Auswerteeinheit erfaßbar ist. So kann die Auswerteeinheit (nicht gezeigt) die Spannung in dem Schwingkreis an den Anschlußpunkten A1 oder A2 (jeweils gegen Erde) oder zwischen den Punkten A3 und A4 abgreifen. Die Anschlüsse A3 und A4 sind mit den beiden Enden einer Spule L'verbunden, welche mit der Spule L des Schwingkreises gekoppelt ist. Dadurch wird eine Übertragung der Schwingung, also der Frequenz des Schwingkreises zur Auswerteeinheit bei gleichzeitiger galvanischer Trennung erreicht.In Figure 4, several options are also shown, such as the resonance frequency of the resonant circuit can be detected by an evaluation unit. So it can Evaluation unit (not shown) the voltage in the resonant circuit at the connection points A1 or A2 (each against earth) or between points A3 and tap A4. Ports A3 and A4 are one with the two ends Coil L'connected, which is coupled to the coil L of the resonant circuit. Thereby becomes a transmission of the oscillation, i.e. the frequency of the oscillating circuit to the evaluation unit with simultaneous galvanic isolation.
Die Auswertung der so übermittelten Signale in der Auswerteeinheit erfolgt nach allgemeinem Stand der Technik. Dabei kann jeweils die Frequenz des Schwingkreises bestimmt werden, indem z. B. die Schwingungen in einem bestimmten Zeitintervall gezählt werden. Es sind aber auch Differenzmethoden denkbar, bei denen direkt erkannt wird, wenn der Schwingkreis durch Aufstellen, Verschieben oder Wegnehmen eines Kochgefäßes verstimmt wird. Mit Hilfe der Größe der Frequenzänderung des Schwingkreises kann in der Auswerteeinheit erkannt werden, wie groß das aufgestellte Kochgefäß ist bzw. wie weit ein Kochgefäß auf die Kochplatte aufgeschoben oder von der Kochplatte weggezogen ist.The signals transmitted in this way are evaluated in the evaluation unit general state of the art. The frequency of the resonant circuit can be adjusted be determined by e.g. B. the vibrations in a certain time interval be counted. Differential methods are also conceivable in which is directly recognized when the resonant circuit by setting up, moving or Removing a cooking vessel is out of tune. Using the size of the frequency change of the resonant circuit can be recognized in the evaluation unit is the size of the cooking vessel or how far a cooking vessel is on the hotplate is pushed on or pulled away from the hotplate.
Bei Mehrkreis-Heizelementen kann der jeweilige Heizkreis als eigener Sensor verwendet werden und so die Größe des aufgestellten Topfes ermittelt werden. Es können aber auch mehrere, von der jeweiligen Heizspannungsversorgung über Trennkondensatoren abgetrennte Heizelemente zu einem kapazitiven Sensor zusammengeschaltet werden. In diesem Fall wird die Größe des aufgestellten Topfes durch das Maß der Frequenzänderung im Schwingkreis ermittelt. With multi-circuit heating elements, the respective heating circuit can be used as a separate sensor and so the size of the pot can be determined. It but can also have several, from the respective heating voltage supply Separating capacitors interconnected heating elements to form a capacitive sensor become. In this case, the size of the pot placed determined by the measure of the frequency change in the resonant circuit.
Nach der Erkennung der Verhältnisse auf der Kochplatte sendet die Auswerteeinheit entsprechende Signale an eine Steuereinheit für die Kochplatte, die daraufhin z. B. die Heizung abschaltet, wenn kein Kochgefäß auf der Kochplatte steht, bei Anwesenheit eines kleinen Topfes nur den inneren Heizkreis einschaltet, bei Anwesenheit eines großen Topfes beide Heizkreise einschaltet oder die Heizung auch dann abstellt, wenn das Kochgefäß zu weit von der zentrischen Position auf der Kochplatte weggeschoben ist. Bei Bedarf kann die Steuereinheit auch so eingestellt werden, daß sie die Signale der Auswerteeinheit der Topferkennung ignoriert und die Heizung allein nach vorgegebenen Einstellwerten regelt.After the conditions on the hotplate have been recognized, the evaluation unit sends appropriate signals to a control unit for the hotplate, which then e.g. B. switches off the heating when there is no cooking vessel on the hotplate In the presence of a small pot, only switch on the inner heating circuit when present a large pot switches on both heating circuits or the heating too then turns off when the cooking vessel is too far from the central position on the The hotplate is pushed away. If necessary, the control unit can also be set in this way that they ignore the signals of the evaluation unit of the pan detection and the heating is regulated solely according to the specified setting values.
Claims (10)
dadurch gekennzeichnet,
daß das Widerstandsheizelement (1) als kapazitiver Sensor zur Topferkennung verwendet ist.Device for detecting the presence and / or the size of a cooking vessel on an electrically heatable hotplate with a resistance heating element located under the hotplate and connected to an electrical heating voltage supply,
characterized,
that the resistance heating element (1) is used as a capacitive sensor for pot detection.
dadurch gekennzeichnet,
daß die Kapazität des Widerstandsheizelementes (1) gegen ein Referenzpotential, vorzugsweise gegen Erde, in einen elektrischen Schwingkreis geschaltet ist, dessen Resonanzfrequenz von einer Auswerteeinheit erfaßbar ist, wodurch die Anwesenheit und/oder die Größe eines Kochgefäßes (6) auf der Kochplatte ermittelbar ist.Device according to claim 1,
characterized,
that the capacitance of the resistance heating element (1) is connected to a reference potential, preferably to earth, in an electrical resonant circuit, the resonance frequency of which can be detected by an evaluation unit, whereby the presence and / or the size of a cooking vessel (6) on the hotplate can be determined.
dadurch gekennzeichnet,
daß das Widerstandsheizelement (1) über elektrische Schaltmittel, vorzugsweise Drosseln (DR1, DR2), an die Heizspannungsversorgung angeschlossen und über ein weiteres elektrisches Schaltmittel, vorzugsweise einen Trennkondensator (CN), in den Schwingkreis geschaltet ist.Device according to claim 1 or 2,
characterized,
that the resistance heating element (1) is connected to the heating voltage supply via electrical switching means, preferably chokes (DR1, DR2) and is connected to the resonant circuit via a further electrical switching means, preferably an isolating capacitor (CN).
dadurch gekennzeichnet,
daß der Schwingkreis das Widerstandsheizelement (1), den Trennkondensator (CN), ein induktives Element, vorzugsweise eine Spule (L), und das Referenzpotential beinhaltet. Device according to one of claims 1 to 3,
characterized,
that the resonant circuit contains the resistance heating element (1), the isolating capacitor (CN), an inductive element, preferably a coil (L), and the reference potential.
dadurch gekennzeichnet,
daß zwischen die elektrischen Anschlüsse des Widerstandsheizelementes (1) ein Kondensator (CP) geschaltet ist.Device according to one of the preceding claims,
characterized,
that a capacitor (CP) is connected between the electrical connections of the resistance heating element (1).
dadurch gekennzeichnet,
daß bei Mehrkreiskochplatten mehrere Schwingkreise verwendbar sind, wobei jeweils das den entsprechenden Heizkreis bildende Heizelement den kapazitiyen Sensor für die Topferkennung bildet.Device according to one of the preceding claims,
characterized,
that in the case of multi-circuit hotplates, a plurality of resonant circuits can be used, the heating element forming the corresponding heating circuit in each case forming the capacitive sensor for the pot detection.
dadurch gekennzeichnet,
daß die Kochplatte aus Keramik oder aus Glaskeramik besteht.Device according to one of the preceding claims,
characterized,
that the hot plate is made of ceramic or glass ceramic.
dadurch gekennzeichnet,
daß das Widerstandsheizelement (1) ein Strahlungsheizkörper, ein Folienheizelement oder eine auf einem Träger aufgebrachte Heizschicht bzw. Heizbahn ist.Device according to one of the preceding claims,
characterized,
that the resistance heating element (1) is a radiant heater, a film heating element or a heating layer or heating track applied to a carrier.
dadurch gekennzeichnet,
daß das Widerstandsheizelement (1) Leitungswicklungen oder ein Flachband aufweist.Device according to one of the preceding claims,
characterized,
that the resistance heating element (1) has line windings or a flat ribbon.
dadurch gekennzeichnet,
daß aufgrund des Wertes oder aufgrund der Änderung der Resonanzfrequenz des Schwingkreises die Größe eines auf der Kochplatte stehenden Kochgefäßes (6) bzw. das Ausmaß der Bedeckung der Kochplatte durch ein Kochgefäß (6) von der Auswerteeinheit erkennbar ist.Device according to one of the preceding claims,
characterized,
that due to the value or due to the change in the resonance frequency of the resonant circuit, the size of a cooking vessel (6) standing on the hotplate or the extent to which the hotplate is covered by a cooking vessel (6) can be recognized by the evaluation unit.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19945297A DE19945297A1 (en) | 1999-09-22 | 1999-09-22 | Pot detection |
| DE19945297 | 1999-09-22 | ||
| US09/666,636 US6259069B1 (en) | 1999-09-22 | 2000-09-21 | Apparatus for detecting the presence of a cooking vessel |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1087640A2 true EP1087640A2 (en) | 2001-03-28 |
| EP1087640A3 EP1087640A3 (en) | 2003-09-17 |
| EP1087640B1 EP1087640B1 (en) | 2006-11-02 |
Family
ID=26055028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00119241A Expired - Lifetime EP1087640B1 (en) | 1999-09-22 | 2000-09-06 | Pot presence and size detection |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6259069B1 (en) |
| EP (1) | EP1087640B1 (en) |
| AT (1) | ATE344609T1 (en) |
| DE (2) | DE19945297A1 (en) |
| ES (1) | ES2275464T3 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007042316A1 (en) * | 2005-10-14 | 2007-04-19 | E.G.O. Elektro-Gerätebau GmbH | Pot detection method and induction heating device |
| EP2763500A1 (en) * | 2013-01-29 | 2014-08-06 | BSH Bosch und Siemens Hausgeräte GmbH | Hob with a hotplate field and a conductor as surface boundary for electronic components |
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| IT1319292B1 (en) * | 2000-11-08 | 2003-10-10 | Whirlpool Co | DEVICE TO DETECT THE PLACEMENT OF COOKING TOOLS ON A COOKING HOB WITH DISCRETE AND DISTRIBUTED HEATING ELEMENTS. |
| US6583392B2 (en) * | 2000-12-22 | 2003-06-24 | General Electric Company | Apparatus and method for determining properties of a cooktop using ultrasound techniques |
| DE10129175A1 (en) * | 2001-06-12 | 2003-01-09 | Ego Elektro Geraetebau Gmbh | Electrical radiation heating body for cooker hobs has sensor for cooking pot detection in form of radiation heating element, preferably corrugated flat metal strip |
| US6492627B1 (en) * | 2001-07-26 | 2002-12-10 | Emerson Electric Co. | Heating unit and control system for cooktops having capability to detect presence of a pan and methods of operating same |
| CA2358602A1 (en) * | 2001-10-09 | 2003-04-09 | Norax Canada Inc. | Resonance controlled conductive heating |
| DE10156777B4 (en) * | 2001-11-19 | 2012-08-02 | BSH Bosch und Siemens Hausgeräte GmbH | Method for transferring the setting data of a cooking area to another cooking area and cooking appliance for carrying out this method |
| ITMI20031602A1 (en) * | 2003-08-04 | 2005-02-05 | Whirlpool Co | COOKING PLAN WITH RANDOM PLACING WITH USER INTERFACE |
| US20050067399A1 (en) * | 2003-09-30 | 2005-03-31 | Chen-Lung Huang | Safety device of a coffee pot |
| US6834160B1 (en) * | 2003-11-14 | 2004-12-21 | Huang Chen-Lung | Electric heater with a sensor preventing no-water heating |
| FR2895639B1 (en) * | 2005-12-27 | 2008-02-29 | Brandt Ind Sas | VARIABLE SIZE INDUCTION COOKING FIREPLACE |
| US20080153182A1 (en) * | 2006-12-21 | 2008-06-26 | Sokudo Co., Ltd | Method and system to measure and compensate for substrate warpage during thermal processing |
| US20080160462A1 (en) * | 2007-01-03 | 2008-07-03 | Sokudo Co., Ltd. | Method and system for bake plate heat transfer control in track lithography tools |
| KR20080068775A (en) * | 2007-01-20 | 2008-07-24 | 삼성전자주식회사 | Pan sensor and radiant heater having the same and heating cooker having the radiant heater and control method thereof |
| JP5145822B2 (en) * | 2007-08-20 | 2013-02-20 | セイコーエプソン株式会社 | Injection inspection apparatus, printing apparatus, and injection inspection method |
| EP2194754A1 (en) | 2008-12-05 | 2010-06-09 | Electrolux Home Products Corporation N.V. | Sensor arrangement for cookware detection |
| ES2356441B1 (en) * | 2008-12-19 | 2012-03-13 | Bsh Electrodomésticos España, S.A. | COOKING FIELD WITH AN INDUCTOR, AN INVESTOR AND A CONNECTION DEVICE. |
| FI122808B (en) * | 2009-02-24 | 2012-07-13 | Marimils Oy | Plane Electrode System |
| ES2362782B1 (en) * | 2009-04-17 | 2012-05-22 | Bsh Electrodomésticos España, S.A. | COOKING FIELD WITH A DETECTION AND PROCEDURE PROVISION TO OPERATE A COOKING FIELD. |
| DE102009020905A1 (en) | 2009-05-12 | 2010-12-09 | Diehl Ako Stiftung & Co. Kg | Hob for use in cookware, has multiple heating elements, which are arranged in or below hot plate for cooking zone, such that each heating element is assigned detection unit for pan detection |
| GB0913704D0 (en) * | 2009-08-05 | 2009-09-16 | Next Row Ltd | Induction heating unit for hair rollers |
| US8699299B2 (en) * | 2010-04-26 | 2014-04-15 | Semiconductor Components Industries, Llc | Self-tuning acoustic measurement system |
| DE102012006847B4 (en) * | 2012-04-04 | 2024-05-29 | Rational Aktiengesellschaft | Cooking appliance with rack detection |
| ITUB20155746A1 (en) * | 2015-11-19 | 2017-05-19 | De Longhi Appliances Srl | APPARATUS FOR COOKING FOOD AND ITS COOKING METHOD |
| CN111837454B (en) * | 2018-03-16 | 2022-08-09 | 三菱电机株式会社 | Induction heating cooker |
| GB2593468B (en) * | 2020-03-23 | 2022-04-13 | Equip Line Ltd | An apparatus for heating a pot of food or beverage |
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- 2000-09-06 AT AT00119241T patent/ATE344609T1/en not_active IP Right Cessation
- 2000-09-06 EP EP00119241A patent/EP1087640B1/en not_active Expired - Lifetime
- 2000-09-06 DE DE50013682T patent/DE50013682D1/en not_active Expired - Lifetime
- 2000-09-21 US US09/666,636 patent/US6259069B1/en not_active Expired - Fee Related
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| EP2763500A1 (en) * | 2013-01-29 | 2014-08-06 | BSH Bosch und Siemens Hausgeräte GmbH | Hob with a hotplate field and a conductor as surface boundary for electronic components |
Also Published As
| Publication number | Publication date |
|---|---|
| DE50013682D1 (en) | 2006-12-14 |
| US6259069B1 (en) | 2001-07-10 |
| EP1087640B1 (en) | 2006-11-02 |
| ATE344609T1 (en) | 2006-11-15 |
| DE19945297A1 (en) | 2001-03-29 |
| EP1087640A3 (en) | 2003-09-17 |
| ES2275464T3 (en) | 2007-06-16 |
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