EP2704524A1 - Dispositif destiné à chauffer par induction électromagnétique, notamment chauffage à induction ou un four à induction - Google Patents

Dispositif destiné à chauffer par induction électromagnétique, notamment chauffage à induction ou un four à induction Download PDF

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Publication number
EP2704524A1
EP2704524A1 EP12182061.7A EP12182061A EP2704524A1 EP 2704524 A1 EP2704524 A1 EP 2704524A1 EP 12182061 A EP12182061 A EP 12182061A EP 2704524 A1 EP2704524 A1 EP 2704524A1
Authority
EP
European Patent Office
Prior art keywords
power supply
supply arrangement
outputs
heating
output
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.)
Withdrawn
Application number
EP12182061.7A
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German (de)
English (en)
Inventor
Peter Wallmeier
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.)
AEG Power Solutions GmbH
Original Assignee
AEG Power Solutions 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 Power Solutions GmbH filed Critical AEG Power Solutions GmbH
Priority to EP12182061.7A priority Critical patent/EP2704524A1/fr
Priority to US13/795,092 priority patent/US20140061187A1/en
Publication of EP2704524A1 publication Critical patent/EP2704524A1/fr
Withdrawn legal-status Critical Current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
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • 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
    • H05B6/067—Control, e.g. of temperature, of power for melting furnaces

Definitions

  • a silicon carbide rod must be heated by an external heat before it becomes sufficiently conductive and, depending on the purity at temperatures of 400 to 1200 ° C, the maximum conductivity is achieved. It is known to heat heated and electrically conductive silicon carbide by means of electromagnetic induction on.
  • the present invention has for its object to propose a device for heating by means of electromagnetic induction, which is also suitable for heating of non-electrically conductive materials at room temperature and set up.
  • the first power supply arrangement serves to heat the inductors by a current flow, so that this radiant heat can be transmitted to a material introduced into the inductors. If the material is sufficiently heated and electrically conductive, eddy currents can be generated in the material by means of the second power supply arrangement and the alternating electromagnetic fields generated in the inductors, which further heat the material very effectively.
  • n is a number divisible by two.
  • the outputs of the second power supply arrangement may be associated with each other in pairs. At the outputs of a pair chained voltages with a phase shift of 180 ° can be applied. The outputs of such a pair need not have common connections, but they can. The fact that at the outputs of the pairs by 180 ° out of phase, so opposite voltages applied, it is possible that over the entire chain of the outputs of the second power supply arrangement in the sum no voltage provided by the second power supply arrangement drops. This has the advantage that no current can be driven by the second power supply arrangement into the first power supply arrangement, at whose output the series-connected inductors are present.
  • inductors connected to the outputs of a pair have an opposite sense of winding. Then it is possible that, despite the opposite voltages applied to the outputs of a pair, rectified by these voltages, electromagnetic fields are generated in the workpiece which reinforce each other.
  • the inductors can be wound from a wire whose resistivity at room temperature can be selected depending on the rated power, the rated current and / or the rated power of the first power supply arrangement.
  • the wire can have a negative or a positive temperature coefficient.
  • a negative temperature coefficient has the advantage that with increasing temperature of the inductors whose conductivity increases. That makes it possible for a sufficient Heating higher currents can flow through the inductors, which then generate stronger electromagnetic fields than is possible with cold inductors.
  • the effect of the resistance heating which is essentially operated by the first power supply arrangement, thus decreases as the heating increases, while the effect of the induction heating operated by the second power supply arrangement becomes stronger.
  • the first power supply arrangement advantageously provides an alternating voltage with a frequency of up to 100 Hz.
  • the frequency of the voltages provided by the second power supply arrangement is advantageously 1 to 100 kHz.
  • the first power supply arrangement advantageously provides an AC voltage of up to 10 to 1000 V available.
  • the amounts of the voltages provided by the second power supply arrangement are advantageously 10 to 1000 V.
  • the inventive device may have a control means with which the voltage at the output of the first power supply arrangement and / or the voltage at the outputs of the second power supply arrangement is adjustable.
  • the control means may be suitable and arranged to set a voltage at the output of the first power supply arrangement at the beginning of the heating of a material introduced into the inductors, which voltage is reduced with increasing heating and / or electrical conductivity of the material.
  • the control means may also be suitable and arranged, at the beginning of the heating of a material introduced into the inductors, voltages at the outputs of the second power supply arrangement set, which is increased with increasing heating and / or electrical conductivity of the material.
  • the device can have a temperature sensor with which the temperature of the workpiece to be heated can be detected.
  • This sensor may be connected to the control means. Depending on the temperature can be controlled by means of the control means, whether the power of the first power supply arrangement is greater than the power of the second power supply arrangement or which power is set at which power supply arrangement.
  • the device according to the invention for heating by means of electromagnetic induction has one of the first power supply arrangement 1 with an output, which has two terminals 11, 12.
  • the device according to the invention also has a second power supply arrangement 2.
  • the second power supply arrangement 2 has two outputs, which are each formed by two terminals 21, 22, 23. A first of the two outputs is formed by the terminals 21, 22 and a second of the outputs is formed by the terminals 22, 23. The terminal 22 is thus used by both the first output and the second output, while the terminals 21,23 are used by only one of the two outputs.
  • the two outputs of the second power supply arrangement 2 form a chain of outputs, which begins with the terminal 21 and ends with the terminal 23.
  • an inductor 31, 32 is connected.
  • the inductor 31 is connected to the terminals 21 and 22.
  • the inductor 32 is connected to the terminals 22 and 23.
  • the inductors 31, 32 are also connected to the output of the first power supply arrangement 1. From the perspective of the first power supply arrangement 1, the two inductors 31, 32 form a series circuit, which is connected to the terminals 1 1, 12 of the first power supply arrangement.
  • the first power supply arrangement 1 serves to supply the inductors 31, 32 with a low-frequency voltage.
  • the second power supply arrangement 2 supplies the inductors 31, 32 with a high-frequency voltage in comparison thereto.
  • the outputs of the second power supply arrangement 2 are 180 ° out of phase voltages of the same level and the same frequency. This has the consequence that between the terminals 21 and 23 no voltage drops.
  • the outputs of the second power supply arrangement 2 form a two-phase AC system with two outer conductors, one outer conductor being connected to the terminals 21, 23 and the other outer conductor being connected to the terminal 22.
  • the chained voltages of the 2-phase AC system are present at the outputs. Chained voltages are the voltages between the outer conductors of the 2-phase AC system.
  • the second power supply arrangement 2 can not feed any current into the first power supply arrangement 1.
  • the first power supply arrangement 1 is thereby decoupled from the second power supply arrangement 2.
  • high-pass filters for example capacitors, can be inserted into the outer conductor leading to the terminals 21, 22 and / or 23.
  • the second power supply arrangement has three outputs.
  • the power supply arrangement would then have another connection, instead of, for example, the Terminal 23 made the end of the chain of outputs.
  • the port 23 would then be used not only by the second output but also by the third output.
  • This second power supply arrangement would then provide on the output side a three-phase AC system with three phases shifted by 120 ° from one another.
  • the second power supply arrangement has four outputs. Two further connections would then be provided in relation to the illustrated second power supply arrangement, one of which forms the end of the chain of the outputs of the second power supply arrangement instead of the connection 23. Port 23 and the other additional port would be associated with the third port. The other additional connection would additionally be assigned to the fourth output.
  • the second power supply arrangement would then advantageously provide a 4-phase AC system on the output side, which has four phases shifted by 90 ° from one another.
  • the second power supply assembly 2 is constructed to provide at the terminals 21, 22, 23 concatenated voltages which are 180 ° out of phase with each other.
  • a simple example of generating such voltages is by using the FIG. 1 illustrated second power supply arrangement 2 possible.
  • This second power supply arrangement 2 shown there has a frequency converter 25, 26, which is formed by a rectifier 26 and an inverter 25 connected downstream of the rectifier.
  • a transformer 24 having a primary winding and a secondary winding is connected, wherein the secondary winding has a center tap which is connected to the terminal 22 the second power supply arrangement 2 is connected. Outer taps of the secondary winding are connected to the terminals 21, 23.
  • the sections of the secondary winding between the terminal 21 and 22 on the one hand and the terminals 22 and 23 on the other hand have different winding senses. For the same number of windings, therefore, the same magnetic flux through the sections of the secondary winding leads to opposite voltages at the outputs of the second power supply arrangement 2.
  • the second power supply arrangement 2 has four outputs, it can have two frequency converters 25, 26 and two transformers 24. Furthermore, it is possible for the second power supply arrangement to have a direct converter which provides a polyphase alternating current.
  • the inductors have a different winding sense.
  • the different winding sense of the inductors 31,32 leads at opposite voltages to the fact that the electromagnetic fields generated by the inductors 31,32 are rectified and reinforce each other. A workpiece (not shown) immersed in the inductors is thereby exposed to a particularly strong electromagnetic field when the inductors 31, 32 are supplied by the second power supply arrangement 2.
  • the device according to the invention has a controller 4, which controls the first power supply arrangement 1 and the second power supply arrangement 2.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
EP12182061.7A 2012-08-28 2012-08-28 Dispositif destiné à chauffer par induction électromagnétique, notamment chauffage à induction ou un four à induction Withdrawn EP2704524A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP12182061.7A EP2704524A1 (fr) 2012-08-28 2012-08-28 Dispositif destiné à chauffer par induction électromagnétique, notamment chauffage à induction ou un four à induction
US13/795,092 US20140061187A1 (en) 2012-08-28 2013-03-12 Apparatus for heating by electromagnetic induction, in particular induction heating or induction furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12182061.7A EP2704524A1 (fr) 2012-08-28 2012-08-28 Dispositif destiné à chauffer par induction électromagnétique, notamment chauffage à induction ou un four à induction

Publications (1)

Publication Number Publication Date
EP2704524A1 true EP2704524A1 (fr) 2014-03-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP12182061.7A Withdrawn EP2704524A1 (fr) 2012-08-28 2012-08-28 Dispositif destiné à chauffer par induction électromagnétique, notamment chauffage à induction ou un four à induction

Country Status (2)

Country Link
US (1) US20140061187A1 (fr)
EP (1) EP2704524A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1117454A1 (fr) 1998-10-01 2001-07-25 Sanofi-Aventis Dispositif d'injection a usage unique destine a etre pre-rempli
EP1361780A1 (fr) * 2002-05-07 2003-11-12 Elka Module de cuisson électrique à induction et procédé de commande du module
EP2100851A2 (fr) 2008-03-10 2009-09-16 AEG Power Solutions B.V. Dispositif et procédé de production d'une répartition régulière de température dans des tiges de silicium lors d'un procédé de séparation
EP2346150A1 (fr) 2010-01-14 2011-07-20 AEG Power Solutions B.V. Agencement modulaire d'alimentation en tension, notamment pour réacteurs destinés à la fabrication de poly-silicium

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1943802A (en) * 1930-03-18 1934-01-16 Ajax Electrothermic Corp Electric induction furnace
EP0744117B1 (fr) * 1994-02-11 1998-05-20 Otto Junker GmbH Procede d'exploitation de fours a induction par fusion et/ou de fours de maintien sans noyau et unite de commutation electrique appropriee
US7180037B2 (en) * 2004-05-26 2007-02-20 Weiss Controls, Inc. Heater wire and control therefor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1117454A1 (fr) 1998-10-01 2001-07-25 Sanofi-Aventis Dispositif d'injection a usage unique destine a etre pre-rempli
EP1361780A1 (fr) * 2002-05-07 2003-11-12 Elka Module de cuisson électrique à induction et procédé de commande du module
EP2100851A2 (fr) 2008-03-10 2009-09-16 AEG Power Solutions B.V. Dispositif et procédé de production d'une répartition régulière de température dans des tiges de silicium lors d'un procédé de séparation
EP2346150A1 (fr) 2010-01-14 2011-07-20 AEG Power Solutions B.V. Agencement modulaire d'alimentation en tension, notamment pour réacteurs destinés à la fabrication de poly-silicium

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Die elektrische Leitfähigkeit des Siliziumkarbids", HELVETICA PHYSICA ACTA, vol. 19, 1946, pages 167

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Publication number Publication date
US20140061187A1 (en) 2014-03-06

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