EP1647037B1 - Composant inductif avec dispositif de refroidissement et utilisation de ce composant - Google Patents

Composant inductif avec dispositif de refroidissement et utilisation de ce composant Download PDF

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Publication number
EP1647037B1
EP1647037B1 EP04763199A EP04763199A EP1647037B1 EP 1647037 B1 EP1647037 B1 EP 1647037B1 EP 04763199 A EP04763199 A EP 04763199A EP 04763199 A EP04763199 A EP 04763199A EP 1647037 B1 EP1647037 B1 EP 1647037B1
Authority
EP
European Patent Office
Prior art keywords
wire winding
inductive component
cooling device
thermally conductive
film
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.)
Not-in-force
Application number
EP04763199A
Other languages
German (de)
English (en)
Other versions
EP1647037A1 (fr
Inventor
Martin Honsberg-Riedl
Johann Otto
Eckhard Wolfgang
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.)
Osram GmbH
Original Assignee
Osram 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 Osram GmbH filed Critical Osram GmbH
Publication of EP1647037A1 publication Critical patent/EP1647037A1/fr
Application granted granted Critical
Publication of EP1647037B1 publication Critical patent/EP1647037B1/fr
Anticipated expiration legal-status Critical
Not-in-force legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/323—Insulation between winding turns, between winding layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/22—Cooling by heat conduction through solid or powdered fillings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof

Definitions

  • the invention relates to an inductive component for forming a magnetic circuit having at least one wire winding and at least one cooling device for cooling the wire winding.
  • ECGs are used as an electronic voltage and / or current transformer in the lighting area.
  • ECGs have at least one inductive component.
  • the inductive component is, for example, a choke coil or a transformer.
  • the inductive component has a wire winding.
  • the wire winding has a number of turns of electrical conductor for generating a magnetic flux through the current flowing in the conductor.
  • the wire winding also serves to generate a voltage by changing the magnetic induction in the wire winding.
  • the wire winding is usually on a core with ferromagnetic material.
  • the ferromagnetic core material is, for example, a ferrite. The core ensures a closed magnetic circuit.
  • the miniaturization relates in particular to an inductive component of the electronic ballasts.
  • a small size of an inductive component can be achieved with a constant power throughput by a higher switching frequency.
  • a higher switching frequency leads to an increase in the electrical losses and thus to a reduction in the quality Q of the inductive component.
  • the quality is a measure of an electrical quality of the inductive Component.
  • the object of the present invention is to provide an inductive component with an efficient cooling device for cooling the wire winding.
  • the object is achieved by an inductive component for forming a magnetic circuit having at least one wire winding and at least one cooling device for cooling the wire winding.
  • the cooling device has at least one composite material with at least one polymer material and at least one thermally conductive filler.
  • a core with a ferromagnetic core material is available, which is suitable for high frequency.
  • the inductive component is characterized in that the cooling device (20) has at least one potting compound (22) which has at least one further composite material with at least one further polymer material and at least one further thermally conductive filler and which is in direct, thermally conductive contact with the wire winding (3), wherein a gap (27) between the potting compound (22) and the wire winding (3) comprises a thermally conductive material for thermal bridging of the gap (27), wherein the thermally conductive material is selected from the group consisting of oil, paste, wax and / or adhesive.
  • the composite material preferably consists of an electrically insulating or electrically poorly conductive polymer material with a thermally conductive and electrically poorly conductive filler.
  • the polymer material may comprise a natural and / or artificial polymer.
  • the natural polymer is, for example, rubber.
  • the artificial polymer is a plastic.
  • the polymer material forms as the base material of the composite material a matrix in which the filler is embedded.
  • the filler or the fillers may be powdery or fibrous.
  • a diameter of a filler particle is selected from the ⁇ m range, which ranges from 100 nm to 100 ⁇ m.
  • a degree of filling of the filler in the polymer material is preferably chosen so that a coagulation limit is exceeded. Below the coagulation limit there is a very low probability that individual filler particles will touch each other. This leads to a relatively low specific thermal conductivity coefficient. If the coagulation limit is exceeded, the filler particles touch with relatively high probability. This results in a relatively high specific thermal conductivity coefficient of the composite material.
  • the filler is thermally conductive and preferably also electrically insulating or electrically poorly conductive. This results in that the inductive component can be operated with a relatively high operating voltage. For example, the operating voltage is up to 2000 V.
  • the composite material is resistant to breakdown even at an operating voltage of this magnitude.
  • a thermally conductive and at the same time electrically insulating or electrically poorly conductive filler is particularly suitable a ceramic material.
  • a ceramic material with the properties mentioned is, for example, aluminum oxide (Al 2 O 3 ).
  • the composite material of the cooling device is preferably connected directly to the wire winding. A heat transfer away from the wire winding occurs by heat conduction.
  • the cooling device has at least one film with the composite material, which is in direct, thermally conductive contact with the wire winding.
  • the film and the wire winding are connected in such a way that heat conduction from the wire winding to the film can take place.
  • the foil and the wire wrap touch each other.
  • a film thickness (film thickness) of the film is for example 0.22 mm.
  • a specific thermal conductivity coefficient ⁇ of 0.15 K / Wm up to 6.5 K / Wm can be achieved.
  • the dielectric strength can be 1 kV to 6 kV despite the relatively low film thickness.
  • a soft film is used with the composite material.
  • the film is plastically and / or elastically deformable.
  • the wire winding may be approximately positively embedded in the film.
  • a thermal Contact surface between the film and the wire winding over which the heat conduction takes place is particularly large.
  • the cooling device has at least one potting compound which has at least one further composite material with at least one further polymer material and at least one further thermally conductive filler and which is in direct, thermally conductive contact with the wire winding and / or the film.
  • the composite material and the further composite material may be the same or different. The same applies to individual components of the composite material and of the further composite material.
  • the wire winding and / or the film are partly or completely embedded in the potting compound with the further composite material. Since the other composite material is thermally conductive and by embedding an almost complete positive connection between casting material and wire winding or film is present, the heat from the wire winding and the film on the casting material can be derived very efficiently.
  • the use of the potting compound leads to a homogeneous temperature distribution within the inductive component.
  • the wire winding of the device is cooled homogeneously. This also contributes to an increased quality of the inductive component.
  • a gap existing between the film and the wire winding and / or between the potting and the wire winding therefore has a thermally conductive material for thermal bridging of the interspace.
  • the gap is preferably complete with the thermally conductive material filled. This leads to improved heat dissipation away from the wire winding.
  • a thermally conductive material is used, which is additionally electrically insulating.
  • the thermally conductive material is selected from the group of oil, paste, wax and / or adhesive.
  • the cooling device of the inductive component is designed such that in the wire winding in the operation of the inductive component heat can be dissipated efficiently to the outside.
  • a further transport of heat away from the composite material of the cooling device is taken care of.
  • the further transport of the heat takes place for example by convection.
  • a fluid is passed past the cooling device with the composite material, which can absorb the heat.
  • the fluid is for example a liquid or a gas or gas mixture.
  • the further transport of the heat takes place by heat conduction.
  • the film with the composite material and / or the potting compound with the composite material is therefore thermally conductively connected to a heat sink by a heat conduction in the inductive component.
  • heat sink is preferably designed such that it can absorb a large amount of heat.
  • the heat capacity of the heat sink is large. It is also conceivable that the heat sink ensures efficient removal of the heat.
  • the heat sink is for example a heat sink made of a material that is characterized by a high thermal conductivity. To maintain the thermal gradient, the heat sink may be cooled by convection.
  • the inductive component is preferably a choke coil or a transformer.
  • An inductor is permeable to direct current. In contrast, alternating current is limited by the choke coil.
  • the choke coil has a high electrical reactance for a high frequency current.
  • the transformer consists of at least two wire windings. But it can also be arranged more than two wire windings to the transformer. Alternatively, there is the Transformer of a wire winding, which is divided by an electrical tap into two parts.
  • the inductive component is used according to a second aspect of the invention in an electronic ballast, in which an electrical input power is converted into an electrical output. Input power and output power are usually different.
  • the device is operated with an alternating voltage having a frequency in the range of 100 kHz inclusive up to and including 200 MHz. This frequency range is referred to as high frequency range.
  • the inductive component has, in particular, a core with a ferromagnetic core material that is suitable for high frequencies.
  • the core material is a ferrite in the form of an M33 core material with a cutoff frequency of about 10 MHz.
  • This core material has manganese and zinc.
  • a K1, K6 or K12 core material is conceivable. These core materials include nickel and zinc.
  • the K6 core material has a cutoff frequency of 7 MHz.
  • the wire winding advantageously has a high-frequency strand with a large number of individual wires insulated from one another.
  • a strand is a wire wound or braided from many metal threads (individual wires).
  • the individual wires are isolated from each other to reduce losses due to skin effect and eddy currents.
  • a lower high-frequency loss resistance is achieved in comparison to a strand with individual wires not insulated from one another with the same cross-section.
  • the individual wires have at least one selected from the range of 10 microns up to and including 50 microns single wire diameter.
  • the plurality is in the range of 10 to including 30 selected.
  • 10 or more individual wires are arranged to a high-frequency strand. This makes it possible to provide wire windings with a relatively large surface and thus with a relatively low high-frequency loss resistance.
  • an AC voltage of up to 2000 volts is used. It has been shown that with the help of the column, a high quality can be achieved even with a few hundred volts with a frequency of a few MHz. This results in that the inductive component can be miniaturized and still a high power throughput can be achieved with high quality and low internal losses.
  • the inductive component can thus be referred to as a miniaturized HF-HV (high-frequency high-voltage) component.
  • the inductive component can also be used in an ignition transformer for igniting a discharge lamp.
  • the discharge lamp is driven via an electrical circuit with a high alternating voltage (initial voltage).
  • a voltage pulse with an AC voltage of up to 40 kV is used.
  • the component is driven with this high AC voltage for a short time within a few microns (ignition duration).
  • the inductive component 1 is an HF-HV (high-frequency high-voltage) transformer ( FIG. 5 ).
  • the component 1 has a wire winding 3 and a core 4.
  • the wire winding is characterized by a winding axis 12, along which the wire of the wire winding 3 is wound.
  • the Wire winding 3 is a high-frequency strand 14 with 30 individual wires.
  • the wire diameter of a single wire is about 30 microns.
  • the core 4 is a ferrite core and consists of a M33 core material.
  • the core has an RM6 core form ( Figures 6a and 6b ).
  • the core is a combination of an E-core shape and a pot core shape with a central bore 15.
  • the core 4 has a core-centered gap 7, which is arranged around the central bore 15 in the inner region 10 of the wire winding 3.
  • Two further gaps 8 are arranged in the outer region 11 of the wire winding 3 in each case one of the core legs 6 of the core 4. All three columns 7 and 8 are air gaps.
  • the gap widths of gaps 7 and 8 are substantially equal, each about 3 mm.
  • the core is essentially symmetrical. It consists of two to the mirror plane 13 mirror-symmetrically arranged parts 5, which are arranged opposite one another at the columns 7 and 8 and spaced from each other by the gap widths 9.
  • the mirror plane 13 is located in the three columns 7 and 8.
  • the wire winding 3 is cooled.
  • a cooling device 20 for cooling the wire winding 3 is present.
  • the cooling device 20 has a foil 21 with a thermally conductive composite material.
  • the base material of the composite is a thermally and electrically poorly conductive polymer material.
  • a filler with high thermal and low electrical conductivity is embedded.
  • the film 21 has a film thickness of about 0.22 mm.
  • the specific thermal conductivity coefficient ⁇ is about 4 K / Wm.
  • the electrical dielectric strength reaches up to about 6 kV.
  • the high-frequency strand 14 of the wire winding 3 and the film 21 are wound around a wound body 30 adapted to the RM6 core shape.
  • the film 21 and the wire winding 3 are arranged around the winding body 30 such that the high-frequency strand 14 of the wire winding 3 and the films 21 alternate starting from the winding body 30 in the radial direction ( FIGS. 1 and 2 ).
  • the foil 21 used serves as an intermediate insulating layer of the high-frequency strand 14 of the wire winding 3.
  • An efficient heat-conducting path 24 results from the wire winding 3 in the radial direction.
  • the cherriesleitpfads 24 heat that is produced during operation of the inductive component in the Hochfrequenzlitze 14, derived efficiently.
  • the high-frequency strand 14 of the wire winding 3 and a plurality of films 21 are individually aligned radially relative to the winding body 30 (FIG. FIG. 3 ). It is a multi-chamber solution realized, which is also referred to as disk winding. Here, too, an efficient dissipation of heat via the heat conduction path 24 is provided.
  • the inductive component 1 or the cooling device 20 of the inductive component 1 is embedded in a potting compound 22 with a further thermally conductive composite material ( FIGS. 1 and 3 ).
  • the potting compound 22 is contacted with a portion of the wire winding 3 thermally conductive directly. This means that the heat can be dissipated via heat conduction via a thermal contact surface between the high-frequency winding 14 of the wire winding 3 and the film 21 or the films 21.
  • the potting compound 22 is thermally conductively connected to the heat sink 25 via heat conduction.
  • the heat sink 25 is a Board with a thermally highly conductive material. During operation of the inductive component, a relatively small temperature difference results between the wire winding 3 and the heat sink 25.
  • the heat is further dissipated by a discharge fin 26 having a relatively high coefficient of thermal conductivity ( FIG. 2 ).
  • a discharge fin 26 having a relatively high coefficient of thermal conductivity ( FIG. 2 ).
  • the Ableitfinne 26 which is connected via a spacer ceramic 28 with a relatively high thermal conductivity coefficient with the films 21, the heat from the films 21 and the wire winding 3 in the direction of heat sink 25 is forwarded.
  • gaps 27 may be present which reduce the efficiency with which the wire winding 3 is cooled ( FIG. 4 ).
  • These intermediate spaces 27 are filled according to a further embodiment with a thermally conductive and electrically insulating or poorly conductive paste.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Insulating Of Coils (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • General Induction Heating (AREA)
  • Coils Or Transformers For Communication (AREA)

Claims (9)

  1. Composant ( 1 ) inductif pour la formation d'un circuit magnétique, qui a au moins un enroulement ( 3 ) de fil et au moins un dispositif ( 20 ) de refroidissement pour refroidir l'enroulement ( 3 ) de fil, dans lequel
    le dispositif ( 20 ) de refroidissement a au moins un matériau composite ayant au moins un matériau polymère et au moins une charge conductrice de la chaleur,
    dans lequel il y a un noyau ayant un matériau de noyau ferromagnétique, qui convient pour la haute fréquence,
    caractérisé en ce que
    le dispositif (20) de refroidissement a au moins une composition (22) de scellement, qui a au moins un autre matériau composite ayant au moins un autre matériau polymère et au moins une autre charge conductrice de la chaleur et qui est en contact direct conducteur de la chaleur avec l'enroulement ( 3 ) de fil,
    dans lequel un espace ( 22 ) intermédiaire, présent entre la composition ( 22 ) de scellement et l'enroulement ( 3 ) de fil, a un matériau conducteur de la chaleur pour pomper thermiquement l'espace ( 27 ) intermédiaire, le matériau conducteur de la chaleur étant choisi dans le groupe d'une huile, d'une pâte, d'une cire et/ou d'une colle.
  2. Composant suivant la revendication 1, dans lequel le dispositif ( 20 ) de refroidissement a au moins une feuille ( 21 ) ayant le matériau composite, qui est en contact direct conducteur de la chaleur avec l'enroulement de fil.
  3. Composant suivant la revendication 2, dans lequel la composition ( 22 ) de scellement est en contact direct conducteur de la chaleur avec l'enroulement ( 3 ) de fil et/ou avec la feuille ( 21 ).
  4. Composant suivant la revendication 3, dans lequel il est prévu un espace ( 27 ) intermédiaire présent entre la feuille ( 21 ) d'enroulement et l'enroulement ( 3 ) de fil et/ou entre la composition ( 22 ) de scellement et d'enroulement ( 3 ) de fil, espace qui a du matériau conducteur de la chaleur pour pomper thermiquement l'espace ( 27 ) intermédiaire.
  5. Composition suivant l'une des revendications 1 à 4,
    dans lequel la feuille ( 21 ) ayant le matériau composite et/ou la composition ( 22 ) de scellement ayant l'autre matériau composite est reliée d'une manière conducteur de la chaleur à un puits ( 25 ) de chaleur par une conduction de chaleur.
  6. Composition suivant l'une des revendications 1 à 5,
    dans lequel l'enroulement ( 3 ) de fil a une tresse de haute fréquence ayant une pluralité de fils individuels isolés électriquement les uns des autres.
  7. Composition suivant la revendication 6, dans lequel les fils individuels ont au moins un diamètre dans la plage allant de 10 µm inclus à 50 µm inclus.
  8. Composition suivant la revendication 7, dans lequel on choisit la pluralité dans la plage allant de 10 inclus à 30 inclus.
  9. Composition suivant l'une des revendications 1 à 8,
    dans lequel le composant est une bobine de self ou un transformateur.
EP04763199A 2003-07-18 2004-07-13 Composant inductif avec dispositif de refroidissement et utilisation de ce composant Not-in-force EP1647037B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10332842A DE10332842A1 (de) 2003-07-18 2003-07-18 Induktives Bauelement mit Kühlvorrichtung und Verwendung des Bauelements
PCT/EP2004/007739 WO2005013296A1 (fr) 2003-07-18 2004-07-13 Composant inductif avec dispositif de refroidissement et utilisation de ce composant

Publications (2)

Publication Number Publication Date
EP1647037A1 EP1647037A1 (fr) 2006-04-19
EP1647037B1 true EP1647037B1 (fr) 2009-11-11

Family

ID=34041955

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04763199A Not-in-force EP1647037B1 (fr) 2003-07-18 2004-07-13 Composant inductif avec dispositif de refroidissement et utilisation de ce composant

Country Status (7)

Country Link
EP (1) EP1647037B1 (fr)
KR (1) KR20060037366A (fr)
CN (1) CN1839450B (fr)
AT (1) ATE448555T1 (fr)
DE (2) DE10332842A1 (fr)
TW (1) TW200509154A (fr)
WO (1) WO2005013296A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005008521A1 (de) 2005-02-24 2006-08-31 OCé PRINTING SYSTEMS GMBH Anordnung und Verfahren zum Kühlen eines Leistungshalbleiters
DE102005019114A1 (de) 2005-04-25 2006-10-26 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Elektronisches Gerät mit einer elektrischen Spule
KR100774673B1 (ko) * 2006-08-11 2007-11-08 현대자동차주식회사 Ｄｃ/ｄｃ 컨버터의 트랜스포머 방열 구조
WO2011082392A1 (fr) * 2010-01-04 2011-07-07 Lineagen, Inc. Biomarqueurs géniques de la fonction pulmonaire
FR2959858B1 (fr) * 2010-05-04 2012-07-13 Adeneo Dispositif de refroidissement d'un composant magnetique
DE102011080256A1 (de) * 2011-08-02 2012-10-04 Osram Ag Transformator
DE102011082045A1 (de) * 2011-09-02 2013-03-07 Schmidhauser Ag Drossel und zugehöriges Herstellungsverfahren
DE102013208653A1 (de) * 2013-05-10 2014-11-13 Sts Spezial-Transformatoren-Stockach Gmbh & Co. Kg Induktives Bauteil
DE102013217728A1 (de) * 2013-09-05 2015-03-05 Siemens Aktiengesellschaft Spulenanordnung

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DE6916811U (de) * 1969-04-25 1969-10-02 Schlenker Maier Elektro Joh Transformator mit gehaeuse
JPS5928975B2 (ja) * 1975-06-16 1984-07-17 松下電器産業株式会社 変成器
JPH01154488A (ja) * 1987-12-09 1989-06-16 Toshiba Corp 電子レンジ用昇圧トランス
DE8903618U1 (de) * 1989-03-22 1989-05-03 Blaupunkt-Werke Gmbh, 3200 Hildesheim Transformator
US5189080A (en) * 1989-04-25 1993-02-23 Robert Bosch Gmbh Epoxy resin composition for encapsulating electric circuit components
DE4317368A1 (de) * 1993-05-25 1994-12-01 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Verfahren zum Betrieb einer Hochdruckentladungslampe
US6198373B1 (en) * 1997-08-19 2001-03-06 Taiyo Yuden Co., Ltd. Wire wound electronic component
US6259347B1 (en) * 1997-09-30 2001-07-10 The United States Of America As Represented By The Secretary Of The Navy Electrical power cooling technique
AU2003250792B2 (en) * 2002-07-19 2007-02-15 Siemens Aktiengesellschaft Inductive component and use of said component

Also Published As

Publication number Publication date
CN1839450B (zh) 2010-12-08
TW200509154A (en) 2005-03-01
DE502004010352D1 (de) 2009-12-24
CN1839450A (zh) 2006-09-27
DE10332842A1 (de) 2005-02-10
EP1647037A1 (fr) 2006-04-19
KR20060037366A (ko) 2006-05-03
WO2005013296A1 (fr) 2005-02-10
ATE448555T1 (de) 2009-11-15

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