EP0188980B1 - Einrichtung zur Herstellung von Induktionskochplatten mit mehreren einzelregelbaren Kocheinheiten und einem einzigen Generator - Google Patents

Einrichtung zur Herstellung von Induktionskochplatten mit mehreren einzelregelbaren Kocheinheiten und einem einzigen Generator Download PDF

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Publication number
EP0188980B1
EP0188980B1 EP19850420234 EP85420234A EP0188980B1 EP 0188980 B1 EP0188980 B1 EP 0188980B1 EP 19850420234 EP19850420234 EP 19850420234 EP 85420234 A EP85420234 A EP 85420234A EP 0188980 B1 EP0188980 B1 EP 0188980B1
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EP
European Patent Office
Prior art keywords
generator
voltage
installation according
inductor
relay
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
EP19850420234
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English (en)
French (fr)
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EP0188980A1 (de
Inventor
Michel Poumey
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Cableco SA
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Cableco SA
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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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
    • H05B6/065—Control, e.g. of temperature, of power for cooking plates or the like using coordinated control of multiple induction coils

Definitions

  • the present invention relates to an improvement made to installations making it possible to produce induction-heated cooking plates and comprising several fires which can be adjusted separately.
  • these cooking plates operating directly on the mains comprise for their supply a converter G using transistor or thyristor semiconductors.
  • the self-induction of the oscillating circuit (C.O.) of the converter G is directly used in inductor 1.
  • This oscillating circuit depending on the type of converter G, is either of the series circuit type or of the plug circuit type.
  • the self induction used in inductor 1 is an air coil of the flat spiral type in the form of a disc with a diameter comparable to that of the bottom of the utensil (pan for example) to be heated.
  • a support plate made of non-metallic material on which the utensil rests and which also serves to delimit a certain distance thanks to its thickness between said utensil and the plane upper of the inductor coil (1).
  • the electromagnetic field created by the passage of the high frequency current produced by the converter G causes, during its passage through the inductor coil 1, Eddy currents which directly heat the utensil.
  • a power regulating member R, specific to the converters G makes it possible to obtain a modulation of the heat dissipated in the utensil from the "low heat” to the "high heat".
  • the cooking hearth F itself is supplied by means of a frequency converter (generator G operating on the mains) making it possible to obtain at its output a frequency of 25 to 35 kHz for a supply of 220 volts at a frequency of 50 or 60 Hz.
  • the generator G supplies an inductor I forming the hearth proper and includes a tuning capacitor C as well as a means for adjusting the power R.
  • the capacitor C incorporated in the generator G is either in series with the inductor 1 or, as illustrated in FIG. 1, in parallel with it in the case of the plug circuit.
  • the means for adjusting the power R is internal to the generator G.
  • It acts for example at the level of the 220 volt supply by on / off cycles with a variable cycle ratio or by chopping the current 50 or 60 Hz absorbed or by variation of the value of the mains voltage. It can also act by action on the semiconductors used, transistors or thyristors for example, by means of their control electrode, for example by varying their working time in any other way.
  • US ⁇ A 925 3,925,633 describes a solution making it possible to produce a hob comprising several separately adjustable hearths and a single generator, but in this solution, there is a circuit which uses a high frequency energy source capable by itself to provide an output oscillation either in the absence (unladen) of a load circuit, or in the presence of one or more load circuits mounted in shunt.
  • This circuit has the disadvantage of requiring the use of other semiconductor switches in addition to those of the generator, in order to adjust the power and this for each of the load circuits.
  • the present invention aims to solve this problem and therefore relates to a new type of installation for supplying high-frequency current to a hob (or the like) comprising several stoves which can operate independently of each other, an installation which, unlike to the previous solutions, requires for its implementation only one generator for all the households.
  • the installation according to the invention comprises a single generator G whose output power is constant for supplying all the homes, and it is characterized in that the homes are constituted by power inductors variable arranged in inductive circuits connected in derivation to the output of the single generator, either of the plug oscillating type or of the series oscillating type, the inductive circuit of each inductor being composed of the inductor in series with a coil whose self induction is adjustable, and a relay constant.
  • the installation according to the invention makes it possible to supply a high-frequency current to a cooking plate comprising several cooking zones which can operate independently of each other.
  • all of the hearths are constituted by identical circuits connected in bypass to the output of the single generator G, generator which in the present case is of known type and has its capacitor C.
  • FIG. 1 illustrates one of the circuits of FIG. 2, two circuits mounted as a bypass at the output of said generator G.
  • Each circuit consists essentially of an inductor 1, constituting the hearth proper, and, mounted on the supply of this inductor, an element B for adjusting the power.
  • This element B consists of a coil, an embodiment of which is illustrated in more detail in FIG. 5.
  • This coil B has a variable variable self-induction. Consequently, the heating power of the inductor I depends on the impedance presented by the self induction of the coil B. If this self LB has a high impedance (L B . ⁇ large in front of L I . ⁇ ), the power delivered by inductor 1 will be low.
  • a plurality of circuits are therefore mounted in parallel at the outlet of the generator G (cf. FIGS. 3 and 4).
  • the identical elements of these different circuits will be designated by the same abbreviations possibly assigned an index, 1 for the first focus, 2 for the second, 3 for the third ...
  • the generator G can therefore produce its nominal power P.
  • the maximum power which the inductor 1 1 can deliver is P 1 ⁇ P and that which the inductor 1 2 can deliver is P 2 ⁇ P.
  • the coils B 1 and B 2 can vary independently of one another and whose powers supplied by I 1 and 1 2 also.
  • the capacitor C remains common to all of the circuits 1 1 , B 1 , I 2 , B 2 , I 3 , B3 , 14 , B 4 . ...
  • the sum of the maximum powers that the fireplaces can deliver remains equal to the nominal power P of the generator G.
  • the dimensioning of the inductors I and their control coils B makes it possible to assign to each of them a specific maximum power .
  • such an embodiment is not limiting and other ways of setting the power can be used as will be seen in the following description.
  • a cooking plate comprising n fireplaces, three for example, one having a power of 1500 W, the second of 1000 W and the third of 500 W.
  • the nominal power P of the corresponding generator is therefore 3000 W.
  • each circuit 1 1 , B 1 or 1 2 , B 2 ... must be able to be used alone or simultaneously depending on the number of utensils to be heated at the same time, such an imperative is easily obtained in accordance with l installation according to the invention as shown in the detailed electrical diagram which is the subject of Figure 4, a figure which shows in detail the circuits of two homes, the other homes (3, 4) not being shown.
  • the mains supply voltage U is established or interrupted by means of a relay reactivating a contact R in series with one of the input conductors 50 Hz, 60 Hz of generator G.
  • This relay r is actuated by switches i 1 , i 2 , i 3 ... placed together in bypass. Thus, r is controlled by any of these switches i 1 , i 2 , i 3 .
  • the switches i 1 , i 2 , i 3 can for example be controlled by a rotary axis also actuating the cursor of a potentiometer p 1 , p 2 , p 3 .
  • This voltage V is used to supply the power control circuits of the inductors 1 1 , 1 2 , 1 3 ... produced in accordance with the invention and which are all identical. If we consider the circuit of the inductor II, the circuit therefore comprises the element B 1 (coil), illustrated in detail in FIG. 5, and making it possible to vary the power inside said inductor 1 1 . It also includes a contact R 1 of the relay r 1 . This contact R 1 is in the open position at rest.
  • the coil B 1 (FIG. 5) comprises a control winding b 1 operating in direct current.
  • the choke L B1 is made up by putting two windings in opposite directions around two end legs of a low loss magnetic circuit for the operating frequency around 30 kHz.
  • This control winding b 1 is constituted by a coil placed around the central leg of the magnetic circuit.
  • the action on the cursor of the potentiometer P 1 also has the consequence of increasing the DC voltage on the control winding b 1 of the coil B 1 thanks to the conduction of the transistor T 1 mounted as a follower emitter; the voltage on the transmitter of T 1 and therefore on the coil b 1 is equal to the voltage on its base which is determined by the position of the potentiometer cursor.
  • P 1 corresponds to a value of the power delivered by the inductor I 1 ; the maximum power supplied is obtained when the cursor is at the maximum, that is to say, in the example illustrated in FIG. 4, for a DC voltage on b 1 equal to 100 V.
  • 1 2 can be started in the same way by turning the potentiometer control axis P 2 , the same for P 3 .
  • inductors I 1 , I 2 , 1 3 as well as absolutely identical adjustment coils B i , B 2 , B 3 .
  • the invention not only presents the fact of having only one generator to supply all the homes, which significantly reduces the cost, as well as the size but also, eliminates certain risks of breakdowns.
  • the contacts R i , R 2 and R 3 ... of the relays r 1 , r 2 , r 3 ... could also be advantageously controlled by thermostatic members; under these conditions, the power of the inductor would be subject to the temperature difference existing between the sensor of the thermostatic member (bulb, bimetal strip, probe, CTN, thermocouple ...) placed for example under the bottom of the utensil and the instruction displayed by the control axis.
  • the power regulation would then be of the closed loop type.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)

Claims (9)

1. Zur Verwirklichung von Kochplatten mit Erwärmung durch Induktion geeignete Vorrichtung mit mehreren einzeln einstellbaren Kochstellen und mit einem einzigen Generator (G) mit konstanter Ausgangsleistung zum Versorgen der Gesamtheit der Kochstellen, dadurch gekennzeichnet, daß die Kochstellen durch Induktivitäten 111, 12 ...) variabler Leistung gebildet werden, die in Selbstinduktionskreisen angeordnet sind, welche in Parallelschaltung an den Ausgang des einzigen Generators (G) angeschlossen sind, der ein Oszillator in Sperrkreisschaltung oder Reihenschaltung sein kann, wobei die Selbstinduktionskreise jeder Induktivität (I) durch die Induktivität (I) in Reihe mit einer Spule (B) einstellbarer Selbsinduktion sowie einen Relaiskontakt gebildet werden.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Relaiskontakt in Abhängigkeit von einem Thermostat-Organ, von einer zyklischen Energie-Zumeßeinrichtung oder ganz einfach von einem Ein/Aus-Schalter oder dgl. betätigbar ist.
3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Abstimmkondensator (C) des Generators (G) gemeinsam für die Gesamtheit der Selbsinduktionskreise vorhanden ist.
4. Vorrichtung nach anspruch 1 oder 2, dadurch gekennzeichnet, daß jede einstellbare und variable Selbstinduktionsspule einen Magnetkreis aufweist, der mittels eines einstellbaren magnetischen Gleichfeldes sättigbar ist, das durch den Fluß eines einstellbaren Gleichstroms durch eine auf denselben Magnetkreis gewickelte Steuerspule erzeugt wird.
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der sogenannte einstellbare Gleichstrom ausgehend von der gleichgerichteten und mittels eines als Emitterfolger geschalteten Transistors gefilterten Netzspannung erzeugt wird, wobei die Spannung an der Steuerspule im wesentlichen gleich groß wie die Spannung an der Basis des Transistors ist, die infolge einer Verstellung eines Schiebers des Potentiometers einstellbar ist.
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die Potentiometer zwischen ihren Endkontakten mit einer konstanten Spannung beschaltet ist, die gleich einem Bruchteil der gleichgerichteten und gefilterten Netzspannung ist, so daß der Schieber an der Basis des Transistors demzufolge, sobald eine Minimalposition verlassen wurde, eine Spannung bestimmt, die ungleich Null ist und mittels einer Zenerdiode einen Schwellwert bestimmt, um den Komparator umzuschlaten und den Transistor leitend zu schalten, so daß infolge der Erregung des Relais und des Schließens seines Kontakts das Einschalten der Induktivität und das Aufleuchten der Leuchtdiode gewährleistet ist.
7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Steuerwelle des Schiebers des Potentiometers unterhalb der Minimalposition des Schiebers die Betätigung eines Unterbrecherschalters ermöglicht.
8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß die Unterbrecherschalter elektrisch parallel geschaltet sind, und daß jeder beliebige von ihnen ein Relais zum einstellen des Generators (G) steuert.
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß der Relaiskontakt weiterhin das gleichzeitige Einschalten des Generators (G) und der gleichgerichteten und gefilterten Spannung (+V) ermöglicht.
EP19850420234 1984-12-20 1985-12-19 Einrichtung zur Herstellung von Induktionskochplatten mit mehreren einzelregelbaren Kocheinheiten und einem einzigen Generator Expired - Lifetime EP0188980B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8419848A FR2575354B1 (fr) 1984-12-20 1984-12-20 Installation utilisable pour la realisation de plaques de cuisson a chauffage par induction comportant plusieurs foyers reglables separement et un seul generateur
FR8419848 1984-12-20

Publications (2)

Publication Number Publication Date
EP0188980A1 EP0188980A1 (de) 1986-07-30
EP0188980B1 true EP0188980B1 (de) 1990-05-23

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EP19850420234 Expired - Lifetime EP0188980B1 (de) 1984-12-20 1985-12-19 Einrichtung zur Herstellung von Induktionskochplatten mit mehreren einzelregelbaren Kocheinheiten und einem einzigen Generator

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EP (1) EP0188980B1 (de)
DE (1) DE3577964D1 (de)
FR (1) FR2575354B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011036168A1 (de) 2009-09-24 2011-03-31 E.G.O. Elektro-Gerätebau GmbH Verfahren zum einstellen einer heizleistungsabgabe einer induktionsheizeinrichtung sowie zugehörige induktionsheizeinrichtung

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2197995B (en) * 1986-11-25 1991-06-19 Ti Creda Ltd Improvements in or relating to induction heating circuits for cooking appliances
EP0376760A1 (de) * 1988-12-27 1990-07-04 Bonnet S.A. Induktiv geheizte Kochplatte
FR2773014B1 (fr) * 1997-12-23 2000-03-03 Europ Equip Menager Dispositif d'alimentation de plusieurs circuits resonants par un generateur de puissance a onduleur
FR2945608A1 (fr) * 2009-05-15 2010-11-19 Univ Angers Procede et systeme de controle de la temperature d'une cuisson.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK140330B (da) * 1972-04-10 1979-07-30 Matsushita Electric Ind Co Ltd Induktionsvarmeapparat.
GB1446737A (en) * 1972-11-15 1976-08-18 Matsushita Electric Ind Co Ltd Induction cooking appliances
US3925633A (en) * 1974-09-06 1975-12-09 Donald F Partridge Circuit for controlling power flow from a high frequency energy source to a plurality of high frequency loads
JPS51108343A (de) * 1975-03-19 1976-09-25 Matsushita Electric Ind Co Ltd
FR2442566A1 (fr) * 1978-11-24 1980-06-20 Electricite De France Modulation de puissance pour circuit de chauffage a induction
US4453068A (en) * 1979-05-01 1984-06-05 Rangaire Corporation Induction cook-top system and control

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011036168A1 (de) 2009-09-24 2011-03-31 E.G.O. Elektro-Gerätebau GmbH Verfahren zum einstellen einer heizleistungsabgabe einer induktionsheizeinrichtung sowie zugehörige induktionsheizeinrichtung
DE102009048490A1 (de) * 2009-09-24 2011-04-07 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Einstellen einer Heizleistungsabgabe einer Induktionsheizeinrichtung sowie zugehörige Induktionsheizeinrichtung

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Publication number Publication date
DE3577964D1 (de) 1990-06-28
EP0188980A1 (de) 1986-07-30
FR2575354A1 (fr) 1986-06-27
FR2575354B1 (fr) 1988-09-09

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