EP0286044B1 - Circuit pour l'alimentation en courant d'une plaque de cuisson par induction - Google Patents

Circuit pour l'alimentation en courant d'une plaque de cuisson par induction Download PDF

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Publication number
EP0286044B1
EP0286044B1 EP88105358A EP88105358A EP0286044B1 EP 0286044 B1 EP0286044 B1 EP 0286044B1 EP 88105358 A EP88105358 A EP 88105358A EP 88105358 A EP88105358 A EP 88105358A EP 0286044 B1 EP0286044 B1 EP 0286044B1
Authority
EP
European Patent Office
Prior art keywords
relay
mains voltage
current source
microprocessor
circuit according
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
EP88105358A
Other languages
German (de)
English (en)
Other versions
EP0286044A2 (fr
EP0286044A3 (en
Inventor
Gerard Dr. Ing. Rilly
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.)
Thomson Electromenager SA
Original Assignee
Thomson Electromenager SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Thomson Electromenager SA filed Critical Thomson Electromenager SA
Priority to AT88105358T priority Critical patent/ATE70399T1/de
Publication of EP0286044A2 publication Critical patent/EP0286044A2/fr
Publication of EP0286044A3 publication Critical patent/EP0286044A3/de
Application granted granted Critical
Publication of EP0286044B1 publication Critical patent/EP0286044B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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

  • induction currents are generated with an induction coil located below the hotplate in the container made of ferromagnetic metal and containing the cooking material, which heats the container and thereby the cooking material contained therein.
  • the hot plates are supplied e.g. from a power source that supplies an alternating current with a peak / peak amplitude of approximately 18-45 A and a frequency between 25 and 40 kHz.
  • the power supplied to each plate is e.g. between 300 W and 3 kW.
  • the current source contains a so-called half-bridge with two power transistors connected in series, which are alternately controlled and blocked with alternating motions of the working frequency and supply the AC voltage for the heating coil at their connection point.
  • An operating voltage which is obtained by rectifying the AC line voltage, is applied to the transistors.
  • This operating voltage is not a pure DC voltage, but a pulsating DC voltage with a frequency of 100 Hz. This is due to the fact that the effort required for screening to a real DC voltage would be prohibitively high for the processed services.
  • the invention has for its object to reduce the disturbances mentioned when switching a power source between different hot plates. This object is achieved by the invention described in claim 1. Advantageous developments of the invention are described in the subclaims.
  • the microprocessor is controlled by the current source with a voltage which contains information about the respective zero crossing of the mains voltage.
  • the microprocessor also contains the values for the pick-up time and the drop-out time of the relays that cause the changeover. By means of this information, the microprocessor controls the relays assigned to the two hotplates in such a way that in the region of the zero crossing of the mains voltage, one hotplate is first switched off and then the other hotplate is switched on.
  • the inevitable pick-up time and fall-off time of the relay is thus factored in by the microprocessor, such that despite these times and regardless of the respective operating frequency, the duration of the connection of the individual plates to the power source and the power supplied to one plate, the switching between the plates always in the area of the zero crossing of the mains voltage with a tolerance of approximately ⁇ 1-2 ms.
  • the current source in the vicinity of the zero crossing of the mains voltage is preferably switched off, so that the relay contacts are always switched in the de-energized state.
  • the network is practically not loaded during the high amplitudes, that is to say in the middle between two zeros, and therefore no significant disturbances occur due to the switchover to the network.
  • two hotplates P1, P2 are connected to the output of the current source G via two relays A and B.
  • This delivers an alternating current to the hot plates P1 and P2 with an amplitude peak / peak of 20 - 40 A, a frequency of 20 - 40 kHz and a power of 300 W - 3 kW.
  • the operating voltage Ua is applied to the current source G, which is a pulsating DC voltage of 100 Hz obtained from the mains voltage.
  • the microprocessor M controls the relays A and B and the current source G and is also supplied by the current source G with the voltage Uo, which contains information about the respective zero crossing of the voltage Ua.
  • the switchover between the hotplates P1 and P2 will be described with reference to FIG. 2.
  • the relay A is attracted by the voltage Ua and the hotplate P1 to the power source G connected.
  • the relay B is not attracted by the voltage UB, so that the hotplate P2 is not connected to the current source G.
  • the voltage UA is switched off at t1.
  • relay A does not drop out due to the fall time.
  • the voltage UB appears from the microprocessor M, but because of the pickup time of the relay B, there is initially no changeover.
  • the current source G is switched off by the processor M by the voltage Us. The current flowing into the plate P1 is therefore interrupted.
  • the hotplate P1 is switched off by opening the contacts of relay A.
  • t4 lies within the surrounding area T of the zero point at t5 in the voltage Ua.
  • relay B responds after the tightening time of t2 - t6 has elapsed. Its contact is closed and thus the plate P2 is switched on to the current source G.
  • the current source G is switched on again by the manipulated variable Us, so that the plate P2 is now fed. It is thus ensured that the switching of the current source G between the plates P1 and P2 always takes place in the surrounding area T of approximately ⁇ 1-2 ms of the zero point at t5 and also when the current source G is switched off.
  • FIG. 4 shows a solution for the switchover, in which lower values for Tu can be selected even with larger powers up to 3 kW than are given per se by the regulation according to FIG. 3.
  • the plate P1 is fed with the power NP1 of 3 kW.
  • the plate P2 is switched off from t13-t14. This temporary shutdown is used to control the average power consumed by plate P2.
  • the system switches back to plate P1. 3 therefore corresponds to t11 and t15.
  • the invention has been described for switching between two plates P1, P2. 1, 2 can also be used for a larger number of plates, for example if the current source G is switched in succession to four different plates.
  • Microprocessor M Type 6805 Motorola Relay A
  • B Type ON-SH 112 DM Original Electric Manufacturing Co, Ltd
  • Tightening time from t2 - t6 5 ms
  • Fall time from t1 - t4 10 - 15 ms

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Cookers (AREA)
  • Electronic Switches (AREA)
  • Baking, Grill, Roasting (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Control Of Temperature (AREA)
  • Electric Stoves And Ranges (AREA)
  • Control Of Resistance Heating (AREA)

Claims (6)

  1. Couplage électrique d'une cuisinière à alimentation inductive de deux réchauds (P1, P2) raccordés successivement à une source de courant (G), alimentée par une tension de réseau (Ua). Les deux réchauds (P1, P2) sont raccordés à la source de courant (G) par des relais respectifs (A, a) et caractérisés par le fait que les relais (A, B) sont commandés par un microprocesseur (M) conformément à leurs temps d'enclenchement et de déclenchement (A, B) devant le passage par zéro (t5) de la tension du réseau (Ua) de telle façon que le déclenchement (t4) d'un relais (A) et l'enclenchement (t6) de l'autre relais (B) se succèdent dans l'ambiance (T) du passage par zéro (t5) de la tension du réseau (Ua).
  2. Couplage selon titre 1, caractérisé par le fait que l'ambiance (T) est d'environ ± 1-2 ms par rapport au passage par zéro (t5).
  3. Couplage selon titre 1, caractérisé par le fait que les deux réchauds (P1, P2) sont alternativement alimentés de puissances différentes (NP1, NP2), sans que l'alimentation soit interrompue en passant d'un réchaud (P1) à l'autre (P2) (fig. 4).
  4. Couplage selon titre 3, caractérisé par le fait que l'alimentation respective d'un réchaud (P2) montre/présente des coupures/interruptions (t13, t14) (fig.4).
  5. Couplage selon titre 1, caractérisé par le fait que les intervalles de la commutation entre les réchauds (P1, P2) sont commandés par le microprocesseur (M) de sorte que la valeur minimale de la période (Tu) du cycle de commutation (t11-t15), qui est prescrite pour ne pas déranger d'autres consommateurs électriques et dépend de la puissance (NP), soit respectée.
  6. Couplage selon titre 1, caractérisé par le fait que la source de courant (G) est déconnectée par le microprocesseur (M) lors de l'ambiance (T).
EP88105358A 1987-04-10 1988-04-02 Circuit pour l'alimentation en courant d'une plaque de cuisson par induction Expired - Lifetime EP0286044B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88105358T ATE70399T1 (de) 1987-04-10 1988-04-02 Schaltung zur stromversorgung einer induktiven kochstelle.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3712242 1987-04-10
DE19873712242 DE3712242A1 (de) 1987-04-10 1987-04-10 Schaltung zur stromversorgung einer induktiven kochstelle

Publications (3)

Publication Number Publication Date
EP0286044A2 EP0286044A2 (fr) 1988-10-12
EP0286044A3 EP0286044A3 (en) 1989-01-11
EP0286044B1 true EP0286044B1 (fr) 1991-12-11

Family

ID=6325367

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88105358A Expired - Lifetime EP0286044B1 (fr) 1987-04-10 1988-04-02 Circuit pour l'alimentation en courant d'une plaque de cuisson par induction

Country Status (6)

Country Link
EP (1) EP0286044B1 (fr)
JP (1) JPS63269478A (fr)
AT (1) ATE70399T1 (fr)
DE (2) DE3712242A1 (fr)
ES (1) ES2028923T3 (fr)
GR (1) GR3004028T3 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4208252A1 (de) * 1992-03-14 1993-09-16 Ego Elektro Blanc & Fischer Induktive kochstellenbeheizung
IT1281843B1 (it) * 1995-01-25 1998-03-03 Meneghetti Ampelio & C S N C Dispositivo di controllo particolarmente per fornelli ad induzione multipiastra
ES2128941B1 (es) * 1996-06-26 2000-01-16 Balay Sa Circuito inversor de configuracion variable.
ES2128958B1 (es) * 1996-11-21 2000-01-16 Balay Sa Procedimiento de control de potencia en cocinas de induccion alimentadas mediante inversores multipuente reconfigurables.
ES2201937B1 (es) * 2003-11-03 2005-02-01 Bsh Electrodomesticos España, S.A. Procedimiento para el funcionamiento de un circuito convertidor.
DE602007003672D1 (de) * 2007-01-23 2010-01-21 Teka Ind Sa Verfahren zur Regelung eines Induktionskochfeldes und zur Ausführung dieses Verfahrens adaptiertes Induktionskochfeld
WO2008092476A1 (fr) * 2007-02-01 2008-08-07 Wmf Württembergische Metallwarenfabrik Ag Plaque de cuisson à induction
DE102008015036A1 (de) 2008-03-14 2009-09-17 E.G.O. Elektro-Gerätebau GmbH Vorrichtung und Verfahren zur Ansteuerung von Induktionsheizeinrichtungen eines Induktionskochfeldes
ATE520279T1 (de) * 2008-12-22 2011-08-15 Fagorbrandt Sas Verfahren zur stromversorgung mit der leistung von zwei induktoren und kochgerät, bei dem dieses verfahren umgesetzt ist
EP2200399B1 (fr) * 2008-12-22 2011-08-10 FagorBrandt SAS Procédé d'alimentation en puissance d'au moins un inducteur et appareil de cuisson mettant en oeuvre ledit procédé
ES2358819B1 (es) * 2009-01-28 2012-04-02 Bsh Electrodomesticos España, S.A. Campo de cocción por inducción con varios inductores.
ES2362607B1 (es) * 2009-08-27 2012-06-05 Bsh Electrodomésticos España, S.A. Multiplexación de cargas de calentamiento por inducción.
ES2531904B1 (es) * 2013-09-18 2016-01-04 Bsh Electrodomésticos España, S.A. Dispositivo de encimera de cocción

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES258204A1 (es) * 1960-05-18 1960-10-01 Werner & Pfleiderer Dispositivo de regulaciën enteramente automatica de la temperatura de instalaciones de calefacciën electrica, por ejemplo, hornos de panificaciën y de secado
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
JPS5294543A (en) * 1976-02-03 1977-08-09 Matsushita Electric Ind Co Ltd Induced heating cooker
DE2901556A1 (de) * 1979-01-16 1980-07-24 Ego Regeltech Kocheinrichtung zur induktiven beheizung eines kochgefaesses
US4308443A (en) * 1979-05-01 1981-12-29 Rangaire Corporation Induction cook-top with improved touch control
EP0040017B1 (fr) * 1980-05-08 1984-07-18 LUCAS INDUSTRIES public limited company Système de commutation pour la connexion séquentielle des charges sur une alimentation electrique
US4551618A (en) * 1981-12-23 1985-11-05 General Electric Company Cooking appliance incorporating heater energy counter means
DE3400671C1 (de) * 1984-01-11 1985-10-24 Thomson Brandt Gmbh Wechselrichter zur Speisung eines Verbrauchers mit einer induktiven Komponente
US4527049A (en) * 1984-02-09 1985-07-02 Raytheon Company Microprocessor controlled electric range

Also Published As

Publication number Publication date
JPS63269478A (ja) 1988-11-07
ATE70399T1 (de) 1991-12-15
EP0286044A2 (fr) 1988-10-12
ES2028923T3 (es) 1992-07-16
DE3712242A1 (de) 1988-10-27
DE3866751D1 (de) 1992-01-23
EP0286044A3 (en) 1989-01-11
GR3004028T3 (fr) 1993-03-31

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