EP0100441B1 - Dispositif pour le chauffage à induction d'une pièce usinée au moyen d'inducteurs multiples - Google Patents

Dispositif pour le chauffage à induction d'une pièce usinée au moyen d'inducteurs multiples Download PDF

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Publication number
EP0100441B1
EP0100441B1 EP83106406A EP83106406A EP0100441B1 EP 0100441 B1 EP0100441 B1 EP 0100441B1 EP 83106406 A EP83106406 A EP 83106406A EP 83106406 A EP83106406 A EP 83106406A EP 0100441 B1 EP0100441 B1 EP 0100441B1
Authority
EP
European Patent Office
Prior art keywords
inverted
clearing
converters
inverted converters
bridge circuit
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
Application number
EP83106406A
Other languages
German (de)
English (en)
Other versions
EP0100441A1 (fr
Inventor
Hans G. Dipl.-Ing. Matthes
Erhard Mauler
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.)
SMS Elotherm GmbH
Original Assignee
AEG Elotherm GmbH
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 AEG Elotherm GmbH filed Critical AEG Elotherm GmbH
Priority to AT83106406T priority Critical patent/ATE22382T1/de
Publication of EP0100441A1 publication Critical patent/EP0100441A1/fr
Application granted granted Critical
Publication of EP0100441B1 publication Critical patent/EP0100441B1/fr
Expired 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

Definitions

  • the invention relates to a device for inductive heating of a workpiece according to the features of the preamble of claim 1.
  • a device for inductive heating of a workpiece is known from DE-A-3 040 820.
  • the smallest extinguishing time or the smallest extinguishing angle of the various inverters is determined by means of an extreme value selector and depending on this smallest extinguishing time or the smallest extinguishing angle Inverters controlled at the same frequency. This ensures that all inverters start up synchronously.
  • the network is replaced by filter circuits and by the throttle device compared to the double inverter frequency of e.g. 300 Hz and its harmonics are shielded.
  • the double inverter frequency e.g. 300 Hz
  • these shielding measures are sufficient even at high powers.
  • the filter circuits for filtering the harmonics and the line impedance form a resonance circuit with a resonance frequency that is below or between the frequencies of the filter circuits.
  • the invention has for its object to provide a device for inductive heating of a workpiece by means of several inductors, which can be operated at low frequency with high powers.
  • the individual parallel resonant circuits have one and the same workpiece, e.g. treat the weld seam of a pipe, there is a magnetic coupling of the individual parallel resonant circuits over the workpiece. This magnetic coupling changes during operation when the individual inductors approach each other locally. The swinging of the inverters when switching on is problematic with such devices.
  • these difficulties can also be remedied in the case of phase-shifted ignition pulses by the measures known per se in that the extinguishing condition controller can be controlled by an extreme value selector, at whose inputs the measured values of the extinguishing time or the extinguishing angle of each inverter are present and below selects the smallest of these measured values and applies them to the input of the extinguishing condition controller.
  • a three-phase rectifier bridge D fully controlled by a current and voltage regulator and equipped with thyristors supplies, via a smoothing choke L, direct current to a plurality of inverters W 1 , W 2 connected in parallel and also equipped with thyristors. Other inverters could be connected in parallel. All inverters W 1 , W 2 are assigned a common extinguishing condition controller LR, which supplies ignition pulses to the various inverters W 1 , W 2 via a corresponding number of outputs.
  • the quenching condition controller LR delivers ignition pulses of the same frequency to the inverters W 1 , W 2 but out of phase with ⁇ / n in the case of n inverters.
  • phase-shifted currents shown in the diagram flow in the individual inverters W 1 , W 2 .
  • Two inverters W i, W 2 therefore, the superimposed frequency to the terminals of the inverter W 1, W 2 twice as large as the frequency of the load L 1 load L 2Last, of each inverter W 1, W 2 current flowing .
  • the smoothing choke L blocks this high frequency against the network.
  • An extreme value selector E is arranged in front of the extinguishing condition regulator LR, which supplies the phase-shifted ignition pulses, at whose inputs there are measuring devices Z i , Z 2 for the extinguishing time in the respective inverters W i , W 2 .
  • the extreme value selector E selects the smallest extinguishing time and sends it as an actual value to the extinguishing condition controller LR. This ensures that the individual inverters W i , W 2 are operated with phase-shifted ignition pulses of one and the same frequency, which is based on the shortest extinguishing time, so that all inverters W 1 , W 2 start to oscillate.
  • each inverter W 1, W 2 assigned measuring means Z 1, Z 2 are omitted for the extinguishing times and the extreme-value selector e.
  • only one measuring device Z 1 is provided, the output signal of which is immediately connected to the extinguishing condition controller LR.

Landscapes

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

Claims (2)

1. Dispostif d'échauffement inductif d'une pièce avec
- un nombre n de circuits résonants parallèles constitués chacun d'un condensateur (C1, C2) et d'un inducteur (L1, L2), avec n > 1,
- un nombre correspondant d'onduleurs (W1, W2) associés chacun à l'un des circuits résonnants parallèles pour l'alimentation séparée en courant alternatif de chacun des circuits résonnants parallèles,
- un dispositif commandé redresseur triphasé (D) pour l'alimentation en courant continu des onduleurs,
- un dispositif de filtrage (L) qui est disposé entre le dispositif redresseur triphasé et les onduleurs,
- un régulateur à condition d'effacement (LR) pour alimenter les éléments de valve des onduleurs avec des impulsions d'amorçage correspondant au temps d'effacement ou à l'angle d'effacement ayant respectivement la même fréquence, caractérisé par le fait que
- le dispositif redresseur triphasé est constitué d'un circuit à pont (D) unique complètement commandé commun à tous les onduleurs (Wi, W2),
- tous les onduleurs connectés les uns aux autres en parallèle par rapport au circuit à pont sont connectés au circuit à pont (D) par l'intermédiaire du dispositif de filtrage contenant une bobine de lissage (L),
- le régulateur à condition d'effacement (LR) présente des moyens pour créer un décalage de phase entre les impulsions d'amorçage pour les différents onduleurs, qui produit un décalage de phase de grandeur π/n entre les courants alternatifs s'écoulant dans les inducteurs.
2. Dispositif selon la revendication 1, caractérisé par le fait que le régulateur à condition d'effacement (LR) est commandé par un sélecteur à valeur extrême (E) aux entrées duquel sont appliquées les valeurs mesurées du temps d'effacement ou de l'angle d'effacement de chacun des onduleurs (W1, W2) et qui choisit parmi ces valeurs mesurées la plus petite et l'applique à l'entrée du régulateur à condition d'effacement.
EP83106406A 1982-07-02 1983-07-01 Dispositif pour le chauffage à induction d'une pièce usinée au moyen d'inducteurs multiples Expired EP0100441B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83106406T ATE22382T1 (de) 1982-07-02 1983-07-01 Einrichtung zur induktiven erwaermung eines werkstueckes mittels mehrerer induktoren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3224738A DE3224738C1 (de) 1982-07-02 1982-07-02 Einrichtung zur induktiven Erwaermung eines Werkstueckes mittels mehrerer Induktoren
DE3224738 1982-07-02

Publications (2)

Publication Number Publication Date
EP0100441A1 EP0100441A1 (fr) 1984-02-15
EP0100441B1 true EP0100441B1 (fr) 1986-09-17

Family

ID=6167430

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83106406A Expired EP0100441B1 (fr) 1982-07-02 1983-07-01 Dispositif pour le chauffage à induction d'une pièce usinée au moyen d'inducteurs multiples

Country Status (4)

Country Link
EP (1) EP0100441B1 (fr)
JP (1) JPS5968193A (fr)
AT (1) ATE22382T1 (fr)
DE (1) DE3224738C1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3710085C2 (de) * 1987-03-27 1994-07-21 Asea Brown Boveri Einrichtung zur induktiven Erwärmung eines Werkstückes mittels mehrerer Induktoren
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.
SE513131C2 (sv) * 1998-11-26 2000-07-10 Linlan Induction Ab Anordning för induktiv uppvärmning, press, användning av anordningen samt förfarande för styrning av anordningen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE408518B (sv) * 1974-05-17 1979-06-11 Matsushita Electric Ind Co Ltd Induktionsuppvermningsanordning
JPS50160849A (fr) * 1974-06-17 1975-12-26
JPS5543781A (en) * 1978-09-21 1980-03-27 Matsushita Electric Ind Co Ltd Induction heating cooking oven
DE3040820C2 (de) * 1980-10-30 1983-06-01 Aeg-Elotherm Gmbh, 5630 Remscheid Einrichtung zur induktiven Beheizung eines Werkstückes mittels mehrerer Induktoren

Also Published As

Publication number Publication date
EP0100441A1 (fr) 1984-02-15
ATE22382T1 (de) 1986-10-15
DE3224738C1 (de) 1984-02-09
JPS5968193A (ja) 1984-04-18

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