EP0188980A1 - 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
EP0188980A1
EP0188980A1 EP85420234A EP85420234A EP0188980A1 EP 0188980 A1 EP0188980 A1 EP 0188980A1 EP 85420234 A EP85420234 A EP 85420234A EP 85420234 A EP85420234 A EP 85420234A EP 0188980 A1 EP0188980 A1 EP 0188980A1
Authority
EP
European Patent Office
Prior art keywords
generator
inductor
installation according
voltage
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.)
Granted
Application number
EP85420234A
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English (en)
French (fr)
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EP0188980B1 (de
Inventor
Michel Poumey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cableco SA
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Cableco SA
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Filing date
Publication date
Application filed by Cableco SA filed Critical Cableco SA
Publication of EP0188980A1 publication Critical patent/EP0188980A1/de
Application granted granted Critical
Publication of EP0188980B1 publication Critical patent/EP0188980B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • 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 (CO) of the converter G is directly used in inductor I.
  • 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 (not shown) in 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 upper plane of the inductor coil (I).
  • 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) allowing a frequency of 25 to 35 kHz to be obtained at its output 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 I 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, at using their control electrode, for example by varying their working time in any other way.
  • 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 is characterized in that it comprises a single generator G, the output power of which is constant to supply all of the homes, said hearths being constituted by inductors with variable power arranged in inductive circuits connected in derivation at the output of the single generator, and that the inductive circuit of each inductor is composed of the inductor in series with a coil whose inductance is adjustable, and a relay contact.
  • 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 the hearths are constituted by identical circuits connected in derivation to the output of the single generator G, generator which in the present case is of known type and comprises its capacitor C.
  • FIG. 1 illustrates one of the circuits and FIG. 2 two circuits mounted as a bypass at the output of said generator G.
  • Each circuit consists essentially of an inductor I, 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 self-induction L B variable in large proportions. Consequently, the heating power of the inductor 1 depends on the impedance of the self induction of the coil B. If this self LB has a high impedance (L B wgrand in front of L I .w), the power delivered by inductor I will be weak.
  • 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 I can deliver is P 1 ⁇ P and that which the inductor I 2 can deliver is P 2 ⁇ P.
  • the coils B and B 2 can vary independently of one another and therefore the powers supplied by I 1 and I 2 also.
  • the capacitor C remains common to all the circuits I 1 , B 1 , I 2 , B 2 , I 3 , B 3 , I 4 , 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 I 1 , B 1 or I 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 well as that appears from the detailed electrical diagram forming the subject of FIG. 4, a figure which represents 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 r actuating 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 iii 1 '2' 3 ''
  • switches i l , 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 I 1 , I 2 , I 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 I1. 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 I (FIG. 5) has a control winding b l operating in direct current.
  • the choke L B1 is constituted by the putting in series of two windings of opposite direction around two extreme legs of a magnetic circuit with low loss for the frequency of operating 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.
  • I can start I 2 in the same way by turning the potentiometer control shaft P 2 , the same for P 3 ...
  • inductors I 1 , I 1 , I 3 as well as absolutely identical adjustment coils B 1 , B 2 B 3 .
  • the invention presents not only 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 1 , R 2 and R3 .. of the relays r l , 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, etc.) placed for example under the bottom of the utensil. and the setpoint displayed by the control axis.
  • the sensor of the thermostatic member bulb, bimetal strip, probe, CTN, thermocouple, etc.
  • the power regulation would then be of the closed loop type.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
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 true EP0188980A1 (de) 1986-07-30
EP0188980B1 EP0188980B1 (de) 1990-05-23

Family

ID=9310991

Family Applications (1)

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

Country Status (3)

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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0376760A1 (de) * 1988-12-27 1990-07-04 Bonnet S.A. Induktiv geheizte Kochplatte
GB2197995B (en) * 1986-11-25 1991-06-19 Ti Creda Ltd Improvements in or relating to induction heating circuits for cooking appliances
FR2773014A1 (fr) * 1997-12-23 1999-06-25 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.
WO2011036168A1 (de) * 2009-09-24 2011-03-31 E.G.O. Elektro-Gerätebau GmbH Verfahren zum einstellen einer heizleistungsabgabe einer induktionsheizeinrichtung sowie zugehörige induktionsheizeinrichtung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3823296A (en) * 1972-04-10 1974-07-09 Matsushita Electric Ind Co Ltd Induction heating coil arrangement in induction heating equipment
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
GB1446737A (en) * 1972-11-15 1976-08-18 Matsushita Electric Ind Co Ltd Induction cooking appliances
FR2305089A1 (fr) * 1975-03-19 1976-10-15 Matsushita Electric Ind Co Ltd Appareil de chauffage a induction
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

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3823296A (en) * 1972-04-10 1974-07-09 Matsushita Electric Ind Co Ltd Induction heating coil arrangement in induction heating equipment
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
FR2305089A1 (fr) * 1975-03-19 1976-10-15 Matsushita Electric Ind Co Ltd Appareil de chauffage a induction
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 (8)

* 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
FR2773014A1 (fr) * 1997-12-23 1999-06-25 Europ Equip Menager Dispositif d'alimentation de plusieurs circuits resonants par un generateur de puissance a onduleur
EP0926926A1 (de) * 1997-12-23 1999-06-30 Compagnie Europeenne Pour L'equipement Menager "Cepem" Gerät zur Versorgung einer Vielzahl von Schwingkreisen durch einen Wechselrichter-Stromgenerator
FR2945608A1 (fr) * 2009-05-15 2010-11-19 Univ Angers Procede et systeme de controle de la temperature d'une cuisson.
WO2011036168A1 (de) * 2009-09-24 2011-03-31 E.G.O. Elektro-Gerätebau GmbH Verfahren zum einstellen einer heizleistungsabgabe einer induktionsheizeinrichtung sowie zugehörige induktionsheizeinrichtung
CN102714893A (zh) * 2009-09-24 2012-10-03 E.G.O.电气设备制造股份有限公司 用于调整感应加热装置的加热功率输出的方法及相应的感应加热装置
CN102714893B (zh) * 2009-09-24 2015-08-19 E.G.O.电气设备制造股份有限公司 用于调整感应加热装置的加热功率输出的方法及相应的感应加热装置

Also Published As

Publication number Publication date
DE3577964D1 (de) 1990-06-28
FR2575354A1 (fr) 1986-06-27
FR2575354B1 (fr) 1988-09-09
EP0188980B1 (de) 1990-05-23

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