WO1996014644A1 - Filter choke - Google Patents

Filter choke Download PDF

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Publication number
WO1996014644A1
WO1996014644A1 PCT/EP1995/004186 EP9504186W WO9614644A1 WO 1996014644 A1 WO1996014644 A1 WO 1996014644A1 EP 9504186 W EP9504186 W EP 9504186W WO 9614644 A1 WO9614644 A1 WO 9614644A1
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WO
WIPO (PCT)
Prior art keywords
coil
coils
filter choke
core
filter
Prior art date
Application number
PCT/EP1995/004186
Other languages
German (de)
French (fr)
Inventor
Bruno Pichler
Norbert Primisser
Original Assignee
Tridonic Bauelemente 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 Tridonic Bauelemente Gmbh filed Critical Tridonic Bauelemente Gmbh
Priority to AU39247/95A priority Critical patent/AU3924795A/en
Publication of WO1996014644A1 publication Critical patent/WO1996014644A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/02—Coils wound on non-magnetic supports, e.g. formers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F37/00—Fixed inductances not covered by group H01F17/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/02—Coils wound on non-magnetic supports, e.g. formers
    • H01F2005/022—Coils wound on non-magnetic supports, e.g. formers wound on formers with several winding chambers separated by flanges, e.g. for high voltage applications

Definitions

  • the present invention relates to a filter choke for filtering out symmetrical and asymmetrical interference.
  • Filter chokes of this type are used, for example, to suppress interference signals which can propagate via a supply line. Two different types of interference can occur. Symmetrical interference sources generate voltage differences between the two wires of the supply line, while asymmetrical interference sources are the cause of voltage differences between one wire of the supply line and earth.
  • So-called current-compensated chokes are used in filter arrangements to suppress asymmetrical interference.
  • This measure allows a high supply current to flow and high inductances can be used for the inductor without the inductor core becoming magnetically saturated, as a result of which the inductor would become unusable for the suppression of interference signals.
  • the filter effect of the choke becomes stronger the more the two coils of the choke are coupled to one another, i.e. the stronger the magnetic fields associated with the supply current cancel each other out.
  • toroidal core chokes are preferably used for current-compensated chokes, the two coils of the filter choke being wound on a highly permeable ferrite toroidal core and the supply current flowing through them in opposite directions.
  • the coupling of the two coils to one another can be significantly improved by using a toroidal core.
  • FIG. 5a shows a filter arrangement which is suitable for filtering out asymmetrical as well as symmetrical interference. The filter arrangement shown in FIG.
  • first filter choke L1 which comprises two coils wound in the same direction and coupled to one another
  • second filter choke L2 which consists of two coils coupled to one another and wound in opposite directions.
  • the symmetrical interference signals can be suppressed with the first filter choke L1, while the asymmetrical interference can be suppressed with the second filter choke L2 - as described above.
  • a capacitor C is arranged between the two filter chokes.
  • DE-OS 26 90 765 proposes to reduce the magnetic coupling of the two coils of an originally completely current-compensated filter choke by a special design of the choke core. This measure means that the filter choke is no longer fully compensated for current, which reduces the filter effect for asymmetrical interference.
  • the redesign of the choke core creates leakage inductances that are used to filter out symmetrical interference.
  • the disadvantage of the reduced filter effect for asymmetrical interference is eliminated by the advantage of the simultaneous filter effect for symmetrical interference.
  • FIG. 5b shows the equivalent circuit diagram of a corresponding filter choke, with which both asymmetrical and symmetrical interference can be filtered out.
  • the filter choke L3 shown in FIG. 5b comprises two coils which are wound in opposite directions and therefore the supply current also flows through them in opposite directions.
  • the coil shown in FIG. 5b is therefore primarily used for feeding out asymmetrical disturbances. Due to the measure that the coupling of the two coils of the filter choke L3 has been reduced, symmetrical interference can also be filtered out by the leakage inductances that have occurred, so that the filter choke L3 acts at least partially as the first filter choke L1 shown in FIG wound and coupled coils can filter out symmetrical interference.
  • Toroidal inductor is increased due to a magnetic bypass inserted into the toroidal core.
  • the resulting leakage inductance acts like the first filter choke L1 shown in Fig. 5a for filtering out symmetrical interference.
  • ring core chokes are relatively complex and expensive to manufacture.
  • DE-Al 37 08 226 proposes to wind the two coils of a single filter choke in opposite directions on top of one another on a rod-shaped coil core.
  • the self-inductance of the two coils is almost the same size and the two coils are separated from each other by a soft magnetic film. With the help of this soft magnetic foil, the leakage inductance of the filter choke can be increased.
  • the coil cores of the types RM3 to RM4 described in DE-Al 37 08 226 are, however, quite expensive due to their complex shape. Likewise, when using a soft magnetic film, the manufacturing costs of the filter choke described above increase.
  • the invention is therefore based on the object of proposing a filter choke which dampens both symmetrical and asymmetrical interference and is simple to manufacture.
  • the coil core has a straight core section, on which the two coils of the filter choke are wound side by side and in opposite directions, so that a supply current flows through the coils in opposite directions. Furthermore, the two coils are spatially separated from one another in the longitudinal direction of the straight core section to such an extent that the formation of stray inductances is ensured.
  • the filter choke can be symmetrical due to the increased distance between the two coils
  • the filter choke according to the invention is thus an ideal compromise between the filter effect against asymmetrical and the filter effect against symmetrical interference realized.
  • the two windings of the filter choke are preferably applied to a coil former which is placed on the coil core.
  • the two windings of the two coils of the filter choke are located in two chambers separated by a partition.
  • the thickness of the partition is chosen to be thicker than would normally be necessary to achieve the dielectric strength between the two coils at a given nominal voltage.
  • the thickness of the partition wall is chosen so large that the formation of leakage inductances is ensured by the reduced coupling of the two coils of the filter choke to one another.
  • the windings of the two coils are wound in opposite directions on the bobbin.
  • the winding of each coil preferably being arranged half in each subchamber of the corresponding chamber of the coil former.
  • the coil core is preferably formed by two E-shaped coil ferrite core halves or column iron powder core halves.
  • the invention has the advantage that a filter choke is proposed in a simple manner by using two discrete choke coils, which attenuates both symmetrical and asymmetrical interference and is simple and inexpensive to manufacture.
  • FIG. 1 shows a coil former according to the invention in front view
  • FIG. 2 shows the coil former according to the invention shown in FIG. 1 in rear view
  • FIG. 3 shows the coil former according to the invention with ferrite core shown in FIGS. 1 and 2
  • 5a shows a known circuit example for a filter arrangement consisting of two filter chokes
  • 5b shows a known circuit example for a filter arrangement consisting of only one filter choke for filtering out both asymmetrical and symmetrical interference.
  • the two oppositely wound coils of the filter choke are wound on a straight core section of a coil core, so that both coils of the filter choke have the same degree of coupling with the core. Both coils have an identical inductance, so that the coils are of the same type to damp interference.
  • a supply current flows through the two coils in opposite directions, so that the magnetic fields caused by the supply current cancel each other out.
  • the two coils preferably have the same number of turns. This arrangement describes an almost current-compensated filter choke with coils wound in opposite directions, so that asymmetrical interference can be filtered out.
  • the inventive increase in the distance between the two windings of the filter choke ensures that the leakage inductance reaches the size necessary for interference suppression of symmetrical interference.
  • the leakage inductance of the filter choke according to the invention is significantly increased by increasing the distance between the two windings.
  • the coils are each wound in separate chambers on a bobbin.
  • the winding capacity of the coil increases with increasing number of turns, so that the resonance frequency of the filter choke, which is determined by the inductance of the choke and the winding capacities of the coils, decreases.
  • the reason for the increased winding capacity with increasing number of turns can be seen in the fact that with a larger number of turns, more or wider layers of the coil wire are wound one above the other. Due to the sinking of the O 96/14644 PC ⁇ 7EP95 / 04186
  • the resonance frequency of the filter choke is no longer suppressed in the desired frequency range of the filter choke.
  • each of the two windings of the filter choke into subchambers again within their chambers of the coil former, so that each winding of the filter choke is divided into two, three or possibly more adjacent chambers.
  • the number or width of the layers of the coil wires wound one above the other can thereby be significantly reduced, so that the winding capacities of the coils decrease and the desired damping in the required frequency range can thus be achieved.
  • the coil former 10 shows the coil former according to the invention in an embodiment with two subchambers.
  • the coil former 10 is divided between an upper side wall 15 and a lower side wall 7 into a total of four subchambers 2a, 2b, 5a, 5b.
  • the partial chambers 2a and 2b or 5a and 5b in turn form chambers 2 and 5 which are separated by a thick partition wall 12.
  • the two chambers 2 and 5 are divided between the partial chambers by thinner partitions 13.
  • the coil body is hollow on the inside, so that it can be placed on a straight core section.
  • At the upper end of the side walls of the bobbin 10 are reinforcements 11
  • Fig. 2 shows the bobbin shown in Fig. 1 in rear view.
  • the coil former 10 shown in FIGS. 1 and 2 is cuboid.
  • Spacers 8 are located on the lower side wall 7, so that when the coil former 10 is placed on a circuit board, a defined distance between the coil former 10 and the circuit board is ensured.
  • Wl and W2 in FIGS. 1 and 2 denote the two windings of the filter choke.
  • the winding W1 of the first coil of the filter choke is, starting from the connecting pin 1, first into the lower part chamber 2a of the upper chamber 2 led.
  • the sub-chamber 2a is wound with half the number of turns of the first winding.
  • the second sub-chamber 2b is also wound with half the number of turns of the first winding W1 of the filter choke.
  • the winding end is guided to the pin 6 of the bobbin 10.
  • the lower partial chamber 5a is first wound with half the number of turns of the second winding W2.
  • the second chamber 5b is wound with half the number of turns and the winding end is led to the connecting pin 4. 1 and 2, the two windings W1 and W2 are wound in such a way that the coils of the filter choke formed by the windings Wl and W2 are flowed through in opposite directions by a supply current.
  • the individual connecting pins 1, 3, 4 and 6 of the coil body 10 are preferably arranged square with equidistant sections a.
  • the fourth coil 4b shows the equivalent circuit diagram of the filter choke described above.
  • the first coil is defined by the winding W1 between the two connecting pins 1 and 6 and the second coil of the filter choke is defined by the winding W2 between the two connecting pins 3 and 4.
  • a supply current flows through the two windings in opposite directions, so that the filter choke defined thereby acts almost as a current-compensated filter choke due to the good coupling of the two coils to one another and asymmetrical disturbances can be filtered out.
  • the filter choke according to the invention can thus also be described by the equivalent circuit diagram shown in FIG. 5b, which shows a current-compensated filter choke which simultaneously acts as a filter choke wound in the same direction for damping symmetrical disturbances.
  • the coil core is preferably formed by two E-shaped ferrite or iron powder core halves 14a, 14b.
  • the upper coil core half 14a is placed on the coil body 10 from above and the lower coil core half 14b from below pushed on, so that a closed three-legged coil core 14 is formed.
  • the coil body 10 surrounds the middle leg of the coil core 14. This configuration of the coil core enables the coupling of the two coils W1 and W2 to the coil core 14 to be further improved, so that the filter effect is almost optimal against asymmetrical interference.
  • the first filter choke L1 shown in FIG. 5a for filtering out symmetrical interference can be omitted; With the filter choke according to the invention, symmetrical and asymmetrical disturbances can be eliminated.
  • typical choke data for the filter choke according to the invention are given if the filter choke is connected to a 230V supply network with 50 to 60 Hz AC voltage and a maximum of 55W load.
  • the two windings W1 and W2 have identical self-inductances in the range 40 mH with a tolerance range of 25% with 175 turns each.
  • the ohmic resistance of the two windings W1 and W2 is a maximum of 1.5 ohms
  • the wire diameter of the windings is at least 0.3 mm.
  • N30, K4000 or similar material can be selected as the material for the ferrite core.
  • the permeability ⁇ of the ferrite core is 4000 with a tolerance range of 25%.
  • the thickness of the partition 12 can be 2 mm, for example.
  • the other partitions 13 are e.g. 1 mm thick.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Networks Using Active Elements (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Filters And Equalizers (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

The invention concerns a filter choke having a coil core (14) which comprises a straight core section and two coils (W1, W2) which are disposed thereon, have identical inductance and are wound in opposite senses. The coils (W1, W2) are disposed adjacent each other on the straight core section and a spacing for forming leakage inductance is provided between the two coils (W1, W2) in the longitudinal direction of the straight core section.

Description

FILTERDROSSEL FILTER THROTTLE
Die vorliegende Erfindung betrifft eine Filterdrossel zum Ausfiltern von symmetrischen und asymmetrischen Störungen.The present invention relates to a filter choke for filtering out symmetrical and asymmetrical interference.
Derartige Filterdrosseln werden beispielsweise zur Unterdrückung von Störsignalen eingesetzt, die sich über eine Versorgungsleitung ausbreiten können. Dabei können zwei unterschiedliche Arten von Störungen auftreten. Symmetrische Störquellen erzeugen Spannungsunterschiede zwischen den beiden Adern der Versorgungsleitung, während asymmetrische Störquellen die Ursache von Spannungsunterschieden zwischen jeweils einer Ader der Versorgungsleitung und Erde sind.Filter chokes of this type are used, for example, to suppress interference signals which can propagate via a supply line. Two different types of interference can occur. Symmetrical interference sources generate voltage differences between the two wires of the supply line, while asymmetrical interference sources are the cause of voltage differences between one wire of the supply line and earth.
Zur Entstörung asymmetrischer Störungen werden sog. stromkompensierte Drosseln in Filteranordnungen eingesetzt. Dabei liegt in jeder Ader der Versorgungsleitung eine Spule der Drossel, wobei die Spulen derart gewickelt sind, daß die mit dem Versorgungsstrom verbundenen Magnetfeldern der Spulen sich nahezu gegenseitig aufheben. Durch diese Maßnahme kann ein hoher Versorgungsstrom fließen und es können für die Drossel hohe Induktivitäten eingesetzt werden, ohne daß der Drosselkern in die magnetische Sättigung gerät, wodurch die Drossel für die Unterdrückung von Störsignalen unbrauchbar werden würde. Die Filterwirkung der Drossel wird umso stärker, je stärker die beiden Spulen der Drossel aneinander gekoppelt sind, d.h. je stärker sich die mit dem Versorgungsstrom verbundenen Magnetfelder gegenseitig aufheben. Voraussetzung für die nahezu vollständige Aufhebung der beiden vom Versorgungsstrom erzeugten Magnetfelder sind gleiche Selbstinduktivitäten sowie gegensinnige Wicklungen der beiden Spulen der Filterdrossel. Vorzugsweise werden für stromkompensierte Drosseln sog. Ringkerndrosseln eingesetzt, wobei auf einen hochpermeablen Ferrit-Ringkern die beiden Spulen der Filterdrossel gewickelt sind und vom Versorgungsstrom gegensinnig durchflössen werden. Durch die Verwendung eines Ringkerns kann die Kopplung der beiden Spulen aneinander deutlich verbessert werden.So-called current-compensated chokes are used in filter arrangements to suppress asymmetrical interference. There is a coil of the choke in each wire of the supply line, the coils being wound such that the magnetic fields of the coils connected to the supply current cancel each other out almost. This measure allows a high supply current to flow and high inductances can be used for the inductor without the inductor core becoming magnetically saturated, as a result of which the inductor would become unusable for the suppression of interference signals. The filter effect of the choke becomes stronger the more the two coils of the choke are coupled to one another, i.e. the stronger the magnetic fields associated with the supply current cancel each other out. The prerequisite for the almost complete abolition of the two magnetic fields generated by the supply current are the same self-inductances as well as opposite windings of the two coils of the filter choke. So-called toroidal core chokes are preferably used for current-compensated chokes, the two coils of the filter choke being wound on a highly permeable ferrite toroidal core and the supply current flowing through them in opposite directions. The coupling of the two coils to one another can be significantly improved by using a toroidal core.
Eine vollkommen stromkompensierte Drossel ist jedoch nicht in der Lage, symmetrische Störsignale zu unterdrücken, da symmetrische Störungen durch eine stromkompensierte Drossel nicht beeinflußt werden können. Um symmetrische Störungen zu bedampfen, ist eine weitere Drossel notwendig, die aus zwei aneinander gekoppelten Spulen besteht, wobei zur Unterdrückung von symmetrischen Störungen die beiden Spulen der zweiten Drossel so gewickelt sein müssen, daß sie gleichsinnig vom Versorgungsstrom durchflössen werden. In Figur 5a ist eine Filteranordnung dargestellt, die sowohl zum Ausfiltern von asymmetrischen als auch von symmetrischen Störungen geeignet ist. Die in Fig. 5a gezeigte Filteranordnung umfaßt eine erste Filterdrossel Ll, die zwei gleichsinnig gewickelte und aneinander gekoppelte Spulen umfaßt, sowie eine zweite Filterdrossel L2, die aus zwei aneinander gekoppelten und gegensinnig gewickelten Spulen besteht. Mit der ersten Filterdrossel Ll können die symmetrischen Störsignale unterdrückt werden, während mit der zweiten Filterdrossel L2 - wie zuvor beschrieben - die asymmetrischen Störungen unterdrückt werden können. Ausnahmsweise ist zwischen den beiden Filterdrosseln ein Kondensator C angeordnet.However, a completely current-compensated choke is not able to suppress symmetrical interference signals, since symmetrical interference cannot be influenced by a current-compensated choke. In order to vaporize symmetrical disturbances, a further choke is necessary, which consists of two coils coupled to one another, in order to suppress symmetrical disturbances, the two coils of the second choke must be wound in such a way that the supply current flows through them in the same direction. FIG. 5a shows a filter arrangement which is suitable for filtering out asymmetrical as well as symmetrical interference. The filter arrangement shown in FIG. 5a comprises a first filter choke L1, which comprises two coils wound in the same direction and coupled to one another, and a second filter choke L2, which consists of two coils coupled to one another and wound in opposite directions. The symmetrical interference signals can be suppressed with the first filter choke L1, while the asymmetrical interference can be suppressed with the second filter choke L2 - as described above. Exceptionally, a capacitor C is arranged between the two filter chokes.
Es ist jedoch wünschenswert, eine Filterdrossel zu schaffen, mit der sowohl asymmetrische als auch symmetrische Störungen ausgefiltert werden können. So wird beispielsweise in der DE-OS 26 90 765 vorgeschlagen, die magnetische Kopplung der beiden Spulen einer ursprünglich vollständig stromkomensierten Filterdrossel durch eine besondere Gestaltung des Drosselkerns zu vermindern. Durch diese Maßnahme ist die Filterdrossel nicht mehr vollständig stromkompensiert, wodurch die Filterwirkung für asymmetrische Störungen verringert wird. Es entstehen jedoch durch die Umgestaltung des Drosselkerns Streuinduktivitäten, die zum Herausfiltern von symmetrischen Störungen eingesetzt werden. Somit wird der Nachteil der verminderten Filterwirkung für asymmetrische Störungen durch den Vorteil der gleichzeitigen Filterwirkung für symmetrische Störungen aufgehoben. Figur 5b zeigt das Ersatzschaltbild einer entsprechenden Filterdrossel, mit der sowohl asymmetrische als auch symmetrische Störungen herausgefiltert werden können. Die in Figur 5b dargestellte Filterdrossel L3 umfaßt zwei Spulen, die gegensinnig gewickelt sind und vom Versorgungsstrom daher auch gegensinnig durchflössen werden. Die in Figur 5b gezeigte Spule dient somit vornehmlich zum Herausfütern von asymmetrischen Störungen. Durch die Maßnahme, daß jedoch die Kopplung der beiden Spulen der Filterdrossel L3 verringert worden ist, können durch die aufgetretenen Streuinduktivitäten auch symmetrische Störungen herausgefiltert werden, so daß die Filterdrossel L3 zumindest teilweise als die in Figur 5a gezeigte erste Filterdrossel Ll wirkt, die aufgrund gleichsinnig gewickelter und miteinander gekoppelter Spulen symmetrische Störungen herausfiltern kann.However, it is desirable to provide a filter choke that can be used to filter out both asymmetrical and symmetrical interference. For example, DE-OS 26 90 765 proposes to reduce the magnetic coupling of the two coils of an originally completely current-compensated filter choke by a special design of the choke core. This measure means that the filter choke is no longer fully compensated for current, which reduces the filter effect for asymmetrical interference. However, the redesign of the choke core creates leakage inductances that are used to filter out symmetrical interference. Thus, the disadvantage of the reduced filter effect for asymmetrical interference is eliminated by the advantage of the simultaneous filter effect for symmetrical interference. FIG. 5b shows the equivalent circuit diagram of a corresponding filter choke, with which both asymmetrical and symmetrical interference can be filtered out. The filter choke L3 shown in FIG. 5b comprises two coils which are wound in opposite directions and therefore the supply current also flows through them in opposite directions. The coil shown in FIG. 5b is therefore primarily used for feeding out asymmetrical disturbances. Due to the measure that the coupling of the two coils of the filter choke L3 has been reduced, symmetrical interference can also be filtered out by the leakage inductances that have occurred, so that the filter choke L3 acts at least partially as the first filter choke L1 shown in FIG wound and coupled coils can filter out symmetrical interference.
Aus der DE-Ul 38 32 167 ist bekannt, asymmetrische und symmetrische Störungen mittels einer einzigen Ringkerndrossel zu beseitigen, indem die Streuinduktivität derFrom DE-Ul 38 32 167 it is known to eliminate asymmetrical and symmetrical interference by means of a single toroidal choke by the leakage inductance of the
Ringkerndrossel aufgrund eines in den Ringkern speichenförmig eingefügten magnetischen Bypasses erhöht wird. Die dadurch auftretende Streuinduktivität wirkt wie die in Fig. 5a gezeigte erste Filterdrossel Ll zum Herausfiltern von symmetrischen Störungen. Allerdings sind derartige Ringkeradrosseln relativ aufwendig und teuer in ihrer Herstellung.Toroidal inductor is increased due to a magnetic bypass inserted into the toroidal core. The resulting leakage inductance acts like the first filter choke L1 shown in Fig. 5a for filtering out symmetrical interference. However, such ring core chokes are relatively complex and expensive to manufacture.
In der DE-Al 37 08 226 wird vorgeschlagen, beiden Spulen einer einzigen Filterdrossel gegensinnig auf einen stabförmigen Spulenkern übereinander zu wickeln. Die Selbstinduktivität der beiden Spulen ist dabei nahezu gleich groß und die beiden Spulen sind voneinander durch eine weichmagnetische Folie getrennt. Mit Hilfe dieser weichmagnetischen Folie kann die Streuinduktivität der Filterdrossel erhöht werden. Die in der DE-Al 37 08 226 beschriebenen Spulenkerne der Typen RM3 bis RM4 sind jedoch aufgrund ihrer aufwendigen Form recht teuer. Ebenso steigen bei Verwendung einer weichmagnetischen Folie die Herstellungskosten der zuvor beschriebenen Filterdrossel. Insbesondere ist jedoch mit der in DE-Al 37 08 226 beschriebenen Filterdrossel die notwendige Gleichartigkeit der Spulen zur Dämpfung der Störungen nur schwer realisierbar, da aufgrund der unterschiedlichen räumlichen Lage der beiden Spulen bezüglich des Spulenkerns die Kopplungsgrade zwischen den beiden Spulen und dem Spulenkern unterschiedlich sind.DE-Al 37 08 226 proposes to wind the two coils of a single filter choke in opposite directions on top of one another on a rod-shaped coil core. The self-inductance of the two coils is almost the same size and the two coils are separated from each other by a soft magnetic film. With the help of this soft magnetic foil, the leakage inductance of the filter choke can be increased. The coil cores of the types RM3 to RM4 described in DE-Al 37 08 226 are, however, quite expensive due to their complex shape. Likewise, when using a soft magnetic film, the manufacturing costs of the filter choke described above increase. In particular, however, with the filter choke described in DE-Al 37 08 226, the necessary similarity of the coils for damping the disturbances can only be achieved with difficulty since the coupling degrees between the two coils and the coil core are different due to the different spatial position of the two coils with respect to the coil core .
Der Erfindung liegt daher die Aufgabe zugrunde, eine Filterdrossel vorzuschlagen, die sowohl symmetrische als auch asymmetrische Störungen bedämpft und einfach in ihrer Herstellung ist.The invention is therefore based on the object of proposing a filter choke which dampens both symmetrical and asymmetrical interference and is simple to manufacture.
Die Aufgabe wird mit Hilfe der im Kennzeichen des Anspruches 1 angegebenen Merkmale gelöst.The object is achieved with the aid of the features specified in the characterizing part of claim 1.
Erfindungsgemäß weist der Spulenkern einen geraden Kernabschnitt auf, auf den die beiden Spulen der Filterdrossel nebeneinander und gegensinnig gewickelt sind, so daß die Spulen von einem Versorgungsstrom gegensinnig durchflössen werden. Des weiteren sind die beiden Spulen in Längsrichtung des geraden Kernabschnitts soweit voneinander räumlich getrennt, daß die Bildung von Streu induktivitäten gewährleistet ist.According to the invention, the coil core has a straight core section, on which the two coils of the filter choke are wound side by side and in opposite directions, so that a supply current flows through the coils in opposite directions. Furthermore, the two coils are spatially separated from one another in the longitudinal direction of the straight core section to such an extent that the formation of stray inductances is ensured.
Durch die direkte Kopplung der beiden Spulen mit dem Spulenkern können asymmetrische Störungen herausgefiltert werden. Gleichzeitig können durch den vergrößerten Abstand zwischen den beiden Spulen der Filterdrossel symmetrischeBy coupling the two coils directly to the coil core, asymmetrical interference can be filtered out. At the same time, the filter choke can be symmetrical due to the increased distance between the two coils
Störungen herausgefiltert werden. Durch die erfindungsgemäße Filterdrossel wird somit ein idealer Kompromiß zwischen der Filterwirkung gegenüber asymmetrischen und der Filterwirkung gegenüber symmetrischen Störungen realisiert.Interference can be filtered out. The filter choke according to the invention is thus an ideal compromise between the filter effect against asymmetrical and the filter effect against symmetrical interference realized.
Vorzugsweise werden die beiden Wicklungen der Filterdrossel auf einem Spulenkörper, der auf dem Spulenkern gesetzt ist, aufgebracht. Die beiden Wicklungen der beiden Spulen der Filterdrossel befinden sich dabei erfindungsgemäß in zwei, durch eine Trennwand getrennte Kammern. Die Dicke der Trennwand ist dabei dicker gewählt, als zur Erreichung der Spannungsfestigkeit zwischen den beiden Spulen bei einer vorgegebenen Nennspannung normalerweise notwendig wäre. Insbesondere ist die Dicke der Trennwand so groß gewählt, daß die Bildung von Streuinduktivitäten durch die verminderte Kopplung der beiden Spulen der Filterdrossel miteinander gewährleistet ist. Die Wicklungen der beiden Spulen sind gegensinnig auf den Spulenkörper gewickelt.The two windings of the filter choke are preferably applied to a coil former which is placed on the coil core. According to the invention, the two windings of the two coils of the filter choke are located in two chambers separated by a partition. The thickness of the partition is chosen to be thicker than would normally be necessary to achieve the dielectric strength between the two coils at a given nominal voltage. In particular, the thickness of the partition wall is chosen so large that the formation of leakage inductances is ensured by the reduced coupling of the two coils of the filter choke to one another. The windings of the two coils are wound in opposite directions on the bobbin.
Gemäß einem bevorzugten Ausführungsbeispiel wird vorgeschlagen, die beiden Kammern des Spulenkörpers jeweils nochmals in zwei Teilkammern aufzuteilen, wobei die Wicklung einer jeden Spule vorzugsweise jeweils zur Hälfte in jeder Teilkammer der entsprechenden Kammer des Spulenkörpers angeordnet ist. Durch diese Maßnahme können die Wicklungkapazitäten der beiden Spulenwicklungen verringert werden, so daß die Resonanzfrequenz der Filterdrossel nahezu konstant gehalten werden kann und die Filterwirkung im geforderten Frequenzbereich der Filterdrossel weiterhin gegeben ist.According to a preferred exemplary embodiment, it is proposed to divide the two chambers of the coil former into two subchambers, the winding of each coil preferably being arranged half in each subchamber of the corresponding chamber of the coil former. By this measure, the winding capacitances of the two coil windings can be reduced, so that the resonance frequency of the filter choke can be kept almost constant and the filter effect is still present in the required frequency range of the filter choke.
Vorzugsweise ist der Spulenkern durch zwei E-förmige Spulen-Ferrit-Kernhälften oder Sulen-Eisenpulver-Kernhälften gebildet.The coil core is preferably formed by two E-shaped coil ferrite core halves or column iron powder core halves.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben. Die Erfindung weist den Vorteil auf, daß auf einfache Art und Weise durch die Verwendung zwei diskreter Drosselspulen eine Filterdrossel vorgeschlagen wird, die sowohl symmetrische als auch asymmetrische Störungen bedämpft und einfach sowie billig in ihrer Herstellung ist.Further advantageous embodiments of the invention are specified in the subclaims. The invention has the advantage that a filter choke is proposed in a simple manner by using two discrete choke coils, which attenuates both symmetrical and asymmetrical interference and is simple and inexpensive to manufacture.
Die Erfindung wird nachfolgend anhand eines bevorzugten Ausführungsbeispiels unter Bezugnahme auf die Zeichnung näher beschrieben.The invention is described below with reference to a preferred embodiment with reference to the drawing.
Es zeigen: Fig. 1 einen erfindungsgemäßen Spulenkörper in Frontansicht, Fig. 2 den in Fig. 1 gezeigten erfindungsgemäßen Spulenkörper in Rückansicht, Fig. 3 den in Fig. 1 und 2 gezeigten erfindungsgemäßen Spulenkörper mit Ferrit-Kern, Fig. 4a und 4b Anordnungen der Anschlußstifte des in den Fig. 1 bis 3 gezeigten erfindungsgemäßen Ausführungsbeispiels,Show it: 1 shows a coil former according to the invention in front view, FIG. 2 shows the coil former according to the invention shown in FIG. 1 in rear view, FIG. 3 shows the coil former according to the invention with ferrite core shown in FIGS. 1 and 2, FIGS. 4a and 4b arrangements of the connecting pins of the 1 to 3 embodiment of the invention shown in Figs.
Fig. 5a ein bekanntes Schaltungsbeispiel für eine aus zwei Filterdrosseln bestehenden Filteranordnung, und5a shows a known circuit example for a filter arrangement consisting of two filter chokes, and
Fig. 5b ein bekanntes Schaltungsbeispiel für eine aus lediglich einer Filterdrossel bestehenden Filteranordnung zum Herausfiltern von sowohl asymmetrischen als auch symmetrischen Störungen.5b shows a known circuit example for a filter arrangement consisting of only one filter choke for filtering out both asymmetrical and symmetrical interference.
Erfindungsgemäß werden die beiden gegensinnig gewickelten Spulen der Filterdrossel auf einen geraden Kernabschnitt eines Spulenkerns gewickelt, so daß beide Spulen der Filterdrossel gleiche Kopplungsgrade mit dem Kern aufweisen. Beide Spulen weisen eine identische Induktivität auf, so daß die zur Bedämpfüng von Störungen notwendige Gleichartigkeit der Spulen gegeben ist. Die beiden Spulen werden von einem Versorgungsstrom gegensinnig durchflössen, so daß sich die vom Versorgungsstrom hervorgerufenen Magnetfelder gegenseitig aufheben. Vorzugsweise weisen die beiden Spulen eine gleiche Windungszahl auf. Durch diese Anordnung ist eine nahezu stromkompensierte Filterdrossel mit gegensinnig gewickelten Spulen beschrieben, so daß asymmetrische Störungen herausgefiltert werden können.According to the invention, the two oppositely wound coils of the filter choke are wound on a straight core section of a coil core, so that both coils of the filter choke have the same degree of coupling with the core. Both coils have an identical inductance, so that the coils are of the same type to damp interference. A supply current flows through the two coils in opposite directions, so that the magnetic fields caused by the supply current cancel each other out. The two coils preferably have the same number of turns. This arrangement describes an almost current-compensated filter choke with coils wound in opposite directions, so that asymmetrical interference can be filtered out.
Durch die erfindungsgemäße Vergrößerung des Abstandes zwischen den beiden Wicklungen der Filterdrossel wird erreicht, daß die Streuinduktivität die für die Entstörung symmetrischer Störungen notwendige Größe erreicht. Die Streuinduktiv iiät der erfindungsgemäßen Filterdrossel wird durch die Vergrößerung des Abstandes zwischen den beiden Wicklungen deutlich erhöht.The inventive increase in the distance between the two windings of the filter choke ensures that the leakage inductance reaches the size necessary for interference suppression of symmetrical interference. The leakage inductance of the filter choke according to the invention is significantly increased by increasing the distance between the two windings.
Wie zuvor beschrieben, werden zur Vergrößerung des Abstandes zwischen den beiden Spulen die Spulen jeweils in getrennten Kammern auf einen Spulenkörper gewickelt. Bei Spulen mit großen Induktivitäten steigt jedoch mit steigender Windungszahl die Wicklungskapazität der Spule, so daß die Resonanzfrequenz der Filterdrossel, die durch die Drosselinduktivität und die Wicklungskapazitäten der Spulen bestimmt ist, sinkt. Der Grund für die erhöhte Wicklungskapazität bei steigender Windungsanzahl ist darin zu sehen, daß bei eine größeren Anzahl von Windungen mehr bzw. breitere Lagen des Spulendrahtes übereinander gewickelt werden. Aufgrund des Sinkens der O 96/14644 PCΪ7EP95/04186As described above, to increase the distance between the two coils, the coils are each wound in separate chambers on a bobbin. In the case of coils with large inductances, however, the winding capacity of the coil increases with increasing number of turns, so that the resonance frequency of the filter choke, which is determined by the inductance of the choke and the winding capacities of the coils, decreases. The reason for the increased winding capacity with increasing number of turns can be seen in the fact that with a larger number of turns, more or wider layers of the coil wire are wound one above the other. Due to the sinking of the O 96/14644 PCΪ7EP95 / 04186
Resonanzfrequenz der Filterdrossel ist eine Entstörung im gewünschten Frequenzbereich der Filterdrossel nicht mehr gegeben.The resonance frequency of the filter choke is no longer suppressed in the desired frequency range of the filter choke.
Um die Wicklungskapazitäten zu verringern wird daher erfindungsgemäß vorgeschlagen, jede der beiden Wicklungen der Filterdrossel nochmals innerhalb ihrer Kammern des Spulenkörpers auf Teilkammern aufzuteilen, so daß jede Wicklung der Filterdrossel auf zwei, drei oder ggf. mehr benachbarten Kammern aufgeteilt ist. Die Anzahl bzw. die Breite der übereinander gewickelten Lagen der Spulendrähte kann dadurch deutlich verringert werden, so daß die Wicklungskapazitäten der Spulen sinken und damit die erwünschte Bedämpfüng im gefordeπen Frequenzbereich erreicht werden kann.In order to reduce the winding capacities, it is therefore proposed according to the invention to divide each of the two windings of the filter choke into subchambers again within their chambers of the coil former, so that each winding of the filter choke is divided into two, three or possibly more adjacent chambers. The number or width of the layers of the coil wires wound one above the other can thereby be significantly reduced, so that the winding capacities of the coils decrease and the desired damping in the required frequency range can thus be achieved.
Wie zuvor beschrieben, könnte das Problem der Wicklungskapazitäten jedoch insbesondere bei Spulen mit größerer Induktivität auftreten. Bei Spulen für geringe Leistungen mit geringerer Induktivität kann jedoch die erwünschte Bedämpfüng für symmetrische und asymmetrische Störungen bereits mit Hilfe des eingangs beschriebenen Zwei-Kammern-Spulenkörpers erreicht werden.As described above, however, the problem of the winding capacitances could occur in particular with coils with a larger inductance. In the case of coils for low power with a lower inductance, however, the desired damping for symmetrical and asymmetrical disturbances can already be achieved with the aid of the two-chamber coil former described at the beginning.
Fig. 1 zeigt den erfindungsgemäßen Spulenkörper in einem Ausführungsbeispiel mit zwei Teilkammern. Der Spulenkörper 10 ist zwischen einer oberen Seitenwand 15 und einer unteren Seitenwand 7 in insgesamt vier Teilkammern 2a, 2b, 5a, 5b unterteilt.1 shows the coil former according to the invention in an embodiment with two subchambers. The coil former 10 is divided between an upper side wall 15 and a lower side wall 7 into a total of four subchambers 2a, 2b, 5a, 5b.
Die Teilkammem 2a und 2b bzw. 5a und 5b bilden wiederum Kammern 2 und 5, die durch eine dicke Trennwand 12 getrennt sind. Die beiden Kammern 2 und 5 sind durch dünnere Trennwände 13 auf die Teilkammern aufgeteilt. Der Spulenkörper ist innen hohl, so daß er auf einen geradeförmigen Kernabschnitt aufgesetzt werden kann. Am oberen Ende der Seitenwände des Spulenkörpers 10 sind Verstärkungen 11 derThe partial chambers 2a and 2b or 5a and 5b in turn form chambers 2 and 5 which are separated by a thick partition wall 12. The two chambers 2 and 5 are divided between the partial chambers by thinner partitions 13. The coil body is hollow on the inside, so that it can be placed on a straight core section. At the upper end of the side walls of the bobbin 10 are reinforcements 11
Seitenwände sowie Führungslaschen 9 ausgebildet.Side walls and guide tabs 9 are formed.
Fig. 2 zeigt den in Fig. 1 dargestellten Spulenkörper in Rückansicht. Der in Fig. 1 und 2 gezeigte Spulenkörper 10 ist quaderförmig ausgebildet. Es ist jedoch selbstverständlich, daß die äußere Gestaltungsform des Spulenkörpers 10 nicht auf die in der Zeichnung gezeigte Ausgestaltung beschränkt ist. An der unteren Seitenwand 7 befinden sich Abstandshalter 8, so daß beim Aufsetzen des Spulenkörpers 10 auf eine Platine ein definierter Abstand zwischen dem Spulenkörper 10 und der Platine gewährleistet ist. Mit Wl und W2 sind in Fig. 1 und 2 die beiden Wicklungen der Filterdrossel bezeichnet. Die Wicklung Wl der ersten Spule der Filterdrossel wird ausgehend vom Anschlußstift 1 zuerst in die untere Teilkammer 2a der oberen Kammer 2 geführt. Die Teilkammer 2a wird mit der halben Anzahl Windungen der ersten Wicklung bewickelt. Anschließend wird die zweite Teilkammer 2b ebenso mit der halben Anzahl an Windungen der ersten Wicklung Wl der Filterdrossel bewickelt. Das Wicklungsende wird an den Anschlußstift 6 des Spulenkörpers 10 geführt. Entsprechend wird mit der unteren Wicklung verfahren, wobei ausgehend vom Anschlußstift 3 zuerst die untere Teilkammer 5a mit der halben Anzahl der Windungen der zweiten Wicklung W2 bewickelt wird. Anschließend wird die zweite Kammer 5b mit der halben Anzahl an Windungen bewickelt und das Wicklungsende an den Anschlußstift 4 geführt. Wie aus Fig. 1 und 2 ersichtlich, sind die beiden Wicklungen Wl und W2 derart gewickelt, daß die durch die Wicklungen Wl und W2 gebildeten Spulen der Filterdrossel gegensinnig von einem Versorgungsstrom durchflössen werden.Fig. 2 shows the bobbin shown in Fig. 1 in rear view. The coil former 10 shown in FIGS. 1 and 2 is cuboid. However, it goes without saying that the external design of the coil body 10 is not limited to the design shown in the drawing. Spacers 8 are located on the lower side wall 7, so that when the coil former 10 is placed on a circuit board, a defined distance between the coil former 10 and the circuit board is ensured. Wl and W2 in FIGS. 1 and 2 denote the two windings of the filter choke. The winding W1 of the first coil of the filter choke is, starting from the connecting pin 1, first into the lower part chamber 2a of the upper chamber 2 led. The sub-chamber 2a is wound with half the number of turns of the first winding. Then the second sub-chamber 2b is also wound with half the number of turns of the first winding W1 of the filter choke. The winding end is guided to the pin 6 of the bobbin 10. The same procedure is followed with the lower winding, starting from the connecting pin 3, the lower partial chamber 5a is first wound with half the number of turns of the second winding W2. Then the second chamber 5b is wound with half the number of turns and the winding end is led to the connecting pin 4. 1 and 2, the two windings W1 and W2 are wound in such a way that the coils of the filter choke formed by the windings Wl and W2 are flowed through in opposite directions by a supply current.
In Fig. 4a ist die Anschlußstiftbelegung des zuvor beschriebenen Spulenkörpers dargestellt. Vorzugsweise sind die einzelnen Anschlußstifte 1 , 3,4 und 6 des Spulenkörpers 10 quadratisch mit äquidistanten Abschnitten a angeordnet.4a shows the pin assignment of the coil former described above. The individual connecting pins 1, 3, 4 and 6 of the coil body 10 are preferably arranged square with equidistant sections a.
Fig. 4b zeigt das Ersatzschaltbild der zuvor beschriebenen Filterdrossel. Durch die Wicklung Wl wird zwischen den beiden Anschlußstiften 1 und 6 die erste Spule und durch die Wicklung W2 zwischen den beiden Anschlußstiften 3 und 4 die zweite Spule der Filterdrossel definiert. Die beiden Wicklungen werden von einem Versorgungsstrom gegensinnig durchflössen, so daß die dadurch festgelegte Filterdrossel aufgrund der guten Kopplung der beiden Spulen miteinander nahezu als stromkompensierte Filterdrossel wirkt und asymmetrische Störungen ausgefiltert werden können.4b shows the equivalent circuit diagram of the filter choke described above. The first coil is defined by the winding W1 between the two connecting pins 1 and 6 and the second coil of the filter choke is defined by the winding W2 between the two connecting pins 3 and 4. A supply current flows through the two windings in opposite directions, so that the filter choke defined thereby acts almost as a current-compensated filter choke due to the good coupling of the two coils to one another and asymmetrical disturbances can be filtered out.
Durch die Vergrößerung des Abstandes zwischen den beiden Spulen Wl und W2 mittels der Trennwand 12 wird die auftretende Streuinduktivität deutlich erhöht, so daß ebenfalls symmetrische Störungen herausgefiltert werden können. Die erfindungsgemäße Filterdrossel kann somit auch durch das in Fig. 5b gezeigte Ersatzschaltbild beschrieben werden, das eine stromkompensierte Filterdrossel zeigt, die gleichzeitig als gleichsinnig gewickelte Filterdrossel zum Dämpfen von symmetrischen Störungen wirkt.By increasing the distance between the two coils W1 and W2 by means of the partition 12, the leakage inductance which occurs is significantly increased, so that symmetrical interference can also be filtered out. The filter choke according to the invention can thus also be described by the equivalent circuit diagram shown in FIG. 5b, which shows a current-compensated filter choke which simultaneously acts as a filter choke wound in the same direction for damping symmetrical disturbances.
Wie in Fig. 3 gezeigt, wird vorzugsweise der Spulenkern durch zwei E-förmige Ferrit¬ oder Eisenpulver-Kernhälften 14a, 14b gebildet. Die obere Spulenkernhälfte 14a wird von oben und die untere Spulenkernhälfte 14b von unten auf den Spulenkörper 10 aufgeschoben, so daß ein geschlossener dreischenkeliger Spulenkern 14 entsteht. Der Spulenkörper 10 umgibt dabei den Mittelschenkel des Spulenkerns 14. Durch diese Ausgestaltung des Spulenkerns kann die Kopplung der beiden Spulen Wl und W2 an den Spulenkern 14 weiter verbessert werden, so daß die Filterwirkung gegenüber asymmetrischen Störungen nahezu optimal ist.As shown in FIG. 3, the coil core is preferably formed by two E-shaped ferrite or iron powder core halves 14a, 14b. The upper coil core half 14a is placed on the coil body 10 from above and the lower coil core half 14b from below pushed on, so that a closed three-legged coil core 14 is formed. The coil body 10 surrounds the middle leg of the coil core 14. This configuration of the coil core enables the coupling of the two coils W1 and W2 to the coil core 14 to be further improved, so that the filter effect is almost optimal against asymmetrical interference.
Aufgrund der erfindungsgemäßen Filterdrossel kann die in Fig. 5a gezeigte erste Filterdrossel Ll zum Herausfiltern von symmetrischen Störungen entfallen; mit der erfindungsgemäßen Filterdrossel können symmetrische als auch asymmetrische Störungen beseitigt werden.Due to the filter choke according to the invention, the first filter choke L1 shown in FIG. 5a for filtering out symmetrical interference can be omitted; With the filter choke according to the invention, symmetrical and asymmetrical disturbances can be eliminated.
Abschließend werden typische Drosseldaten für die erfindungsgemäße Filterdrossel angegeben, wenn die Filterdrossel an ein 230V- Versorgungsnetz mit 50 bis 60 Hz Wechselspannung und maximal 55W Belastung angeschlossen ist. Die beiden Wicklungen Wl und W2 weisen dabei identische Selbstinduktivitäten im Bereich 40 mH mit einem Toleranzbereich von 25% bei jeweils 175 Windungen auf. Der Ohmsche Widerstand der beiden Wicklungen Wl und W2 beträgt maximal 1,5 Ohm, der Drahtdurchmesser der Windungen beträgt mindestens 0,3 mm. Als Material für den Ferrit-Kern kann N30, K4000 oder ähnliches Material gewählt werden. Die Permeabilität μ des Ferrit-Kerns liegt bei 4000 mit einem Toleranzbereich von 25%. Zum Hervorrufen einer ausreichenden Streuinduktivität kann beispielsweise die Dicke der Trennwand 12 2 mm betragen. Die weiteren Trennwände 13 sind z.B. 1 mm dick. Finally, typical choke data for the filter choke according to the invention are given if the filter choke is connected to a 230V supply network with 50 to 60 Hz AC voltage and a maximum of 55W load. The two windings W1 and W2 have identical self-inductances in the range 40 mH with a tolerance range of 25% with 175 turns each. The ohmic resistance of the two windings W1 and W2 is a maximum of 1.5 ohms, the wire diameter of the windings is at least 0.3 mm. N30, K4000 or similar material can be selected as the material for the ferrite core. The permeability μ of the ferrite core is 4000 with a tolerance range of 25%. To produce sufficient leakage inductance, the thickness of the partition 12 can be 2 mm, for example. The other partitions 13 are e.g. 1 mm thick.

Claims

Ansprüche Expectations
1. Filterdrossel mit einem Spulenkern (14), der einen geraden Kernabschnitt und zwei auf diesem angeordnete Spulen (Wl , W2) gleicher Induktivität aufweist, die gegensinnig gewickelt sind, dadurch gekennzeichnet, daß die Spulen (Wl , W2) nebeneinander auf dem geraden Kernabschnitt angeordnet sind, und daß zwischen den beiden Spulen (Wl, W2) in Längsrichtung des geraden Kernabschnitts ein die Bildung von Streuinduktivitäten gewährleistender Abstand vorhanden ist.1. Filter choke with a coil core (14) having a straight core section and two coils (Wl, W2) arranged on the same, which are wound in opposite directions, characterized in that the coils (Wl, W2) side by side on the straight core section are arranged, and that between the two coils (W1, W2) in the longitudinal direction of the straight core section there is a distance ensuring the formation of leakage inductances.
2. Filterdrossel nach Anspruch 1, dadurch gekennzeichnet, daß die beiden Spulen (Wl, W2) jeweils in einer von zwei nebeneinander angeordneten Spulenkammern (2, 5) auf einen Spulenkörper (10) gewickelt sind.2. Filter choke according to claim 1, characterized in that the two coils (Wl, W2) are each wound in one of two adjacent coil chambers (2, 5) on a coil body (10).
3. Filterdrossel nach Anspruch 2, dadurch gekennzeichnet, daß die beiden nebeneinander angeordneten Spulenkammern (2, 5) durch eine isolierende Trennwand (12) getrennt sind, deren Dicke den Abstand zwischen den beiden Spulen (Wl, W2) bestimmt.3. Filter choke according to claim 2, characterized in that the two adjacent coil chambers (2, 5) are separated by an insulating partition (12) whose thickness determines the distance between the two coils (Wl, W2).
4. Filterdrossel nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß mindestens eine der beiden Spulenkammern (2, 5) in mindestens zwei benachbart angeordnete Teilkammern (2a, 2b, 5a, 5b) aufgeteilt ist, und daß die Wicklung (Wl, W2) der in der mindestens einen Spulenkammer (2, 5) angeordneten Spule auf die entsprechenden Teilkammern (2a, 2b, 5a, 5b) der mindestens einen Spulenkammer (2, 5) aufgeteilt ist.4. Filter choke according to claim 2 or 3, characterized in that at least one of the two coil chambers (2, 5) is divided into at least two adjacent subchambers (2a, 2b, 5a, 5b), and that the winding (Wl, W2) the coil arranged in the at least one coil chamber (2, 5) is divided into the corresponding subchambers (2a, 2b, 5a, 5b) of the at least one coil chamber (2, 5).
5. Filterdrossel nach Anspruch 4, dadurch gekennzeichnet, daß die Teilkammern (2a, 2b, 5a, 5b) der mindestens einen Spulenkammer (2, 5) voneinander durch eine Trennwand (13) getrennt sind. 5. Filter choke according to claim 4, characterized in that the partial chambers (2a, 2b, 5a, 5b) of the at least one coil chamber (2, 5) are separated from one another by a partition (13).
6. Filterdrossel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die beiden Spulen (Wl, W2) identische Kopplungsgrade mit dem Spulenkern (14) und eine gleiche Anzahl an Windungen aufweisen.6. Filter choke according to one of the preceding claims, characterized in that the two coils (Wl, W2) have identical degrees of coupling with the coil core (14) and an equal number of turns.
7. Filterdrossel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Spulenkern (14) durch einen Ferritkern oder einen Eisenpulverkern gebildet ist.7. Filter choke according to one of the preceding claims, characterized in that the coil core (14) is formed by a ferrite core or an iron powder core.
8. Filterdrossel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Spulenkern (14) dreischenklig ausgebildet ist.8. Filter choke according to one of the preceding claims, characterized in that the coil core (14) is designed with three legs.
9. Filterdrossel nach Anspruch 8, dadurch gekennzeichnet, daß der Spulenkörper (10) über dem Mittelschenkel des Spulenkerns (14) angeordnet ist.9. Filter choke according to claim 8, characterized in that the coil former (10) is arranged above the center leg of the coil core (14).
10. Filterdrossel nach Anspruch 8 oder 9, dadurch gekennzeichnet, daß der Spulenkern (14) durch zwei E-förmige Spulenkernhälften (14a, 14b) gebildet ist. 10. Filter choke according to claim 8 or 9, characterized in that the coil core (14) is formed by two E-shaped coil core halves (14a, 14b).
PCT/EP1995/004186 1994-11-04 1995-10-25 Filter choke WO1996014644A1 (en)

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AU3924795A (en) 1996-05-31
DE9417708U1 (en) 1996-02-29

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