EP1087640B1 - Anwesenheit- und/oder Grössetopferkennung - Google Patents
Anwesenheit- und/oder Grössetopferkennung Download PDFInfo
- Publication number
- EP1087640B1 EP1087640B1 EP00119241A EP00119241A EP1087640B1 EP 1087640 B1 EP1087640 B1 EP 1087640B1 EP 00119241 A EP00119241 A EP 00119241A EP 00119241 A EP00119241 A EP 00119241A EP 1087640 B1 EP1087640 B1 EP 1087640B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heating element
- resistance heating
- cooking
- resonant circuit
- cooking plate
- 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
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 70
- 238000010411 cooking Methods 0.000 claims abstract description 45
- 239000003990 capacitor Substances 0.000 claims description 15
- 238000011156 evaluation Methods 0.000 claims description 12
- 239000002241 glass-ceramic Substances 0.000 claims description 5
- 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 2
- 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
- 230000005855 radiation Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration 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
Images
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 cooking plate according to the preamble of claim 1.
- EP 0 788 293 A1 describes an electric radiant heater with pan detection, in which an inductive sensor in the form of a loop of thick wire is used, which is mounted in the air space between heating conductor and hotplate and serves as an inductive element of a resonant circuit, the resonant frequency shifts when setting up a pot on the hotplate by changing the inductance of the wire loop.
- DE 196 46 826 A1 discloses a pot detection is disclosed in which capacitive sensors are used, which are formed by a plurality of electrodes, are also located between heating and cooking plate and with which an electrical resonant circuit is operated. When placing a pot on the hotplate, the capacity of these sensors and thus also the resonant frequency of the resonant circuit changes. Further arrangements of capacitive measuring electrodes for pot detection underneath glass ceramic cooking plates are described, for example, in DE 196 43 698 A1, DE 196 48 199 A1 and EP 0 652 688 A1.
- a cooktop in which a plurality of sensors are mounted to detect the footprint of different sized cooking vessels in the hob.
- a sensor capacitive the heat flow measuring, the radiation emanating from heating and hotplate radiation or ultrasonic sensors are provided.
- an electrical conductor is used as the sensor, which forms an open loop and is mounted between the heating element and the cooking plate. When placing a pot on the hotplate, the conductivity of this sensor changes.
- the present invention has the object to realize a simply constructed pan detection, which does not have the disadvantages mentioned above.
- the resistance heating element itself as a capacitive sensor for pot detection
- an additional sensor which would have to be accommodated in the system hotplate resistance heating, is not necessary.
- a deterioration of the electrical insulation system heating cooker is excluded from the outset.
- an air gap between the heating element and hotplate is not necessary, and the heating element can be brought into direct contact with the hotplate.
- the invention is designed so that the capacitance of the resistance heating element against a reference potential, preferably connected to earth, is connected in an electrical resonant circuit that the resonant frequency of this resonant circuit can be detected by an evaluation and so that the presence and / or size of a cooking vessel on the hotplate can be determined.
- the resistance heating element is preferably connected via electrical switching means, preferably throttles, to the heating voltage supply and connected via a further electrical switching means, preferably a separating capacitor, in the resonant circuit.
- 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 terminals of the resistance heating element.
- multi-circuit hotplates can be used in a further development of the invention, several resonant circuits, in each case the heating element forming the corresponding heating circuit is used as a capacitive sensor for pot detection.
- the cooking plate made of ceramic or glass ceramic, that the resistance heating element is a radiant heater, a foil heater or a heating layer applied to a carrier or heating track and that the resistance heating element has line windings or a flat band.
- the size of a cooking vessel standing on the hotplate or the extent of the covering of the hotplate by a cooking vessel of the evaluation unit recognizable.
- the invention relates to a device for pot detection, which is not only determined whether a cooking vessel is on the hotplate or not, but also how much of the surface of the cooking plate is covered by a cooking vessel, whether a large or a small cooking vessel is on the hotplate and whether it is centrally or laterally shifted.
- a device for pot detection has a resistance heating element 1 located under an electrically heated cooking plate (FIG. 1). This is connected via two lines 2, 3 to an electrical Walkerwoodsmakers with 230 volts AC. In the lines 2, 3, two throttles DR1 and DR2 are connected. These have low impedance for the low-frequency heating voltage (50 or 60 Hz), thus allowing the heating current to flow almost unhindered.
- a coil L is connected at branch point 4 via a separator capacitor CN which, on the other hand, is connected to housing 5 and to ground connected is.
- the resistance heating element 1 or its capacitance to the grounded housing 5, the separating capacitor CN, the coil L and ground form a resonant circuit.
- the isolating capacitor CN has a very high impedance for low frequencies, but a very low one for high frequencies. This will prevent the low frequency 230 volt supply voltage from being shorted to ground. On the other hand, it allows high frequency currents, as they occur in such resonant circuits, happen almost unhindered. Thus, the separation capacitor CN effectively disconnects the oscillation circuit from the heating circuit.
- the chokes DR1 and DR2 have a high impedance for the high frequencies of the resonant circuit, so that these high frequencies can not get into the mains.
- a capacitor CP is connected on the side remote from the supply voltage of the chokes DR1 and DR2. This in turn has a very high impedance for the low-frequency supply voltage, so does not let the heating current through; However, it has a very low impedance for high frequencies (ie for those of the resonant circuit), thus allowing them to pass through unhindered.
- the interposition of the capacitor CP shows that both terminals of the resistance heating element 1 for the high frequencies of the resonant circuit are at the same potential and so the entire surface of the heating element 1 can be used as a capacitance-forming capacitor surface.
- FIG. 2 an equivalent circuit diagram of the resonant circuit of Fig. 1 is shown, which - as mentioned above - is separated from the low-frequency heating circuit.
- CH denotes the capacity of the heating element 1 to ground. This capacity CH changes - as will be explained in more detail below - when a cooking pot 6 is placed on the hotplate. This change in capacitance of CH also changes the resonant frequency of the resonant circuit.
- FIG 3 is outlined how the capacitance CH of the resistance heating element 1 is composed of earth.
- the heating element 1 is embedded in an insulating layer 7, in the housing 5.
- About the heating element 1 is a glass ceramic plate 8, on which the cooking pot 6 is.
- the resistance heating element 1 now has on the one hand a capacitance against the grounded housing 5, that is to earth. This capacity is designated CG.
- the heating element 1 but also has a capacity CT relative to the cooking pot 6.
- the cooking pot 6 in turn also has a capacity to earth, which is designated by CE.
- the evaluation unit (not shown) can pick up the voltage in the resonant circuit at the connection points A1 or A2 (in each case to ground) or between the points A3 and A4.
- the terminals A3 and A4 are connected to the two ends of a coil L ', which is coupled to the coil L of the resonant circuit.
- the evaluation of the signals thus transmitted in the evaluation unit takes place according to the general state of the art.
- the frequency of the resonant circuit can be determined by z. B. the vibrations are counted in a certain time interval.
- With the help of the size of the frequency change of the resonant circuit can be detected in the evaluation unit, how large the installed cooking vessel or how far a cooking vessel is pushed onto the cooking plate or pulled away from the cooking plate.
- the respective heating circuit can be used as a separate sensor and thus the size of the installed pot can be determined.
- a plurality of heating elements separated from the respective heating voltage supply via isolating capacitors to be connected together to form a capacitive sensor.
- the size of the installed pot is determined by the extent of the frequency change in the resonant circuit.
- the evaluation After detecting the conditions on the hotplate, the evaluation sends corresponding signals to a control unit for the hotplate, which then z. B. switches off the heater when no cooking vessel is on the hotplate, in the presence of a small pot turns on only the inner heating circuit, in the presence of a large pot both heating circuits turns on or off the heating even if the cooking vessel too far from the central position the cooking plate is pushed away.
- the control unit can also be set so that it ignores the signals of the evaluation of pan detection and controls the heating only according to preset settings
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Cookers (AREA)
- Induction Heating Cooking Devices (AREA)
- Electric Stoves And Ranges (AREA)
- Traffic Control Systems (AREA)
- Geophysics And Detection Of Objects (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19945297 | 1999-09-22 | ||
DE19945297A DE19945297A1 (de) | 1999-09-22 | 1999-09-22 | Topferkennung |
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 EP1087640A2 (de) | 2001-03-28 |
EP1087640A3 EP1087640A3 (de) | 2003-09-17 |
EP1087640B1 true EP1087640B1 (de) | 2006-11-02 |
Family
ID=26055028
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00119241A Expired - Lifetime EP1087640B1 (de) | 1999-09-22 | 2000-09-06 | Anwesenheit- und/oder Grössetopferkennung |
Country Status (5)
Country | Link |
---|---|
US (1) | US6259069B1 (es) |
EP (1) | EP1087640B1 (es) |
AT (1) | ATE344609T1 (es) |
DE (2) | DE19945297A1 (es) |
ES (1) | ES2275464T3 (es) |
Families Citing this family (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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. |
US6583392B2 (en) * | 2000-12-22 | 2003-06-24 | General Electric Company | Apparatus and method for determining properties of a cooktop using ultrasound techniques |
DE10129175A1 (de) * | 2001-06-12 | 2003-01-09 | Ego Elektro Geraetebau Gmbh | Elektrischer Strahlungsheizkörper mit einem Sensor zur Kochgefäßerkennung |
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 (de) * | 2001-11-19 | 2012-08-02 | BSH Bosch und Siemens Hausgeräte GmbH | Verfahren zur Übertragung der Einstellungsdaten einer Kochstelle auf eine andere Kochstelle sowie Gargerät zur Durchführung dieses Verfahrens |
ITMI20031602A1 (it) * | 2003-08-04 | 2005-02-05 | Whirlpool Co | Piano di cottura a piazzamento casuale con interfaccia utente |
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 |
DE102005050035A1 (de) * | 2005-10-14 | 2007-07-19 | E.G.O. Elektro-Gerätebau GmbH | Verfahren zur Topferkennung und Induktionsheizeinrichtung |
FR2895639B1 (fr) * | 2005-12-27 | 2008-02-29 | Brandt Ind Sas | Foyer de cuisson par induction de taille variable |
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 (ko) * | 2007-01-20 | 2008-07-24 | 삼성전자주식회사 | 용기센서와 이를 갖는 발열유닛 및 그 발열유닛을 갖는조리장치와 그 제어방법 |
JP5145822B2 (ja) * | 2007-08-20 | 2013-02-20 | セイコーエプソン株式会社 | 噴射検査装置、印刷装置及び噴射検査方法 |
EP2194754A1 (en) | 2008-12-05 | 2010-06-09 | Electrolux Home Products Corporation N.V. | Sensor arrangement for cookware detection |
ES2356441B1 (es) * | 2008-12-19 | 2012-03-13 | Bsh Electrodomésticos España, S.A. | Campo de cocción con un inductor, un inversor y un dispositivo de conexión. |
FI122808B (fi) * | 2009-02-24 | 2012-07-13 | Marimils Oy | Tasoelektrodijärjestelmä |
ES2362782B1 (es) * | 2009-04-17 | 2012-05-22 | Bsh Electrodomésticos España, S.A. | Campo de cocción con una disposición de detección y procedimiento para accionar un campo de cocción. |
DE102009020905A1 (de) | 2009-05-12 | 2010-12-09 | Diehl Ako Stiftung & Co. Kg | Kochfeld |
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 (de) * | 2012-04-04 | 2024-05-29 | Rational Aktiengesellschaft | Gargerät mit Einschuberkennung |
DE102013201386A1 (de) * | 2013-01-29 | 2014-07-31 | BSH Bosch und Siemens Hausgeräte GmbH | Kochfeld mit einer Kochfeldplatte und einer Leiterbahn als Flächenbegrenzung für Elektronikkomponenten |
ITUB20155746A1 (it) * | 2015-11-19 | 2017-05-19 | De Longhi Appliances Srl | Apparato per la cottura di alimenti e relativo metodo di cottura |
CN111837454B (zh) * | 2018-03-16 | 2022-08-09 | 三菱电机株式会社 | 感应加热烹调器 |
GB2593468B (en) * | 2020-03-23 | 2022-04-13 | Equip Line Ltd | An apparatus for heating a pot of food or beverage |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4334135A (en) * | 1980-12-22 | 1982-06-08 | General Electric Company | Utensil location sensor for induction surface units |
DE3720720A1 (de) * | 1987-06-23 | 1989-01-05 | Bosch Siemens Hausgeraete | Energieuebertragung fuer kabellose haushaltgeraete |
DE3934157C2 (de) * | 1989-10-12 | 1999-01-28 | Bosch Siemens Hausgeraete | Kochmulde |
DE4004129A1 (de) * | 1990-02-10 | 1991-08-14 | Ego Elektro Blanc & Fischer | Einrichtung zum erkennen eines in einer heizzone eines koch- oder waermegeraetes aufgestellten kochgefaesses |
IT1260456B (it) | 1992-01-28 | 1996-04-09 | Whirlpool Italia | Metodo e dispositivo per rilevare a presenza di un corpo per esempio una pentola su un piano di cottura in vetroceramica in corrispondenza di un elemento riscaldante associato a tale piano |
IT1272028B (it) * | 1993-03-15 | 1997-06-10 | Whirlpool Italia | Dispositivo per rilevare la presenza di un contenitore per alimenti, quale una pentola, una pirofila o similare, su un piano di cottura in vetroceramica. |
DE4345472C2 (de) * | 1993-10-28 | 2001-05-10 | Aeg Hausgeraete Gmbh | Verfahren zum Zubereiten von Speisen in einem wenigstens teilweise mit Wasser gefüllten Kochgeschirr auf einem Kochfeld aus Keramik, insbesondere Glaskeramik |
DE19603845B4 (de) * | 1996-02-05 | 2010-07-22 | E.G.O. Elektro-Gerätebau GmbH | Elektrischer Strahlungsheizkörper mit einem aktiven Sensor zur Kochgefäßerkennung |
DE19646826C5 (de) | 1996-02-22 | 2008-10-16 | AEG Hausgeräte GmbH | Vorrichtung zur Temperaturmessung an Kochstellen |
DE19643698C2 (de) * | 1996-05-11 | 2000-04-13 | Aeg Hausgeraete Gmbh | Vorrichtung zur Abschirmung von für kapazitive Messungen verwendeten Leiterbahnen eines Kochfeldes |
GB2321699B (en) * | 1997-01-31 | 1999-11-17 | Ceramaspeed Ltd | Electric heating method |
-
1999
- 1999-09-22 DE DE19945297A patent/DE19945297A1/de not_active Withdrawn
-
2000
- 2000-09-06 ES ES00119241T patent/ES2275464T3/es not_active Expired - Lifetime
- 2000-09-06 EP EP00119241A patent/EP1087640B1/de not_active Expired - Lifetime
- 2000-09-06 DE DE50013682T patent/DE50013682D1/de not_active Expired - Lifetime
- 2000-09-06 AT AT00119241T patent/ATE344609T1/de not_active IP Right Cessation
- 2000-09-21 US US09/666,636 patent/US6259069B1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE50013682D1 (de) | 2006-12-14 |
ATE344609T1 (de) | 2006-11-15 |
DE19945297A1 (de) | 2001-03-29 |
EP1087640A3 (de) | 2003-09-17 |
US6259069B1 (en) | 2001-07-10 |
EP1087640A2 (de) | 2001-03-28 |
ES2275464T3 (es) | 2007-06-16 |
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