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EP1123550A1 - Device for attenuating parasitic voltages - Google Patents

Device for attenuating parasitic voltages

Info

Publication number
EP1123550A1
EP1123550A1 EP99960802A EP99960802A EP1123550A1 EP 1123550 A1 EP1123550 A1 EP 1123550A1 EP 99960802 A EP99960802 A EP 99960802A EP 99960802 A EP99960802 A EP 99960802A EP 1123550 A1 EP1123550 A1 EP 1123550A1
Authority
EP
European Patent Office
Prior art keywords
choke
magnetic core
capacitance
coil
inductance
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.)
Granted
Application number
EP99960802A
Other languages
German (de)
French (fr)
Other versions
EP1123550B1 (en
Inventor
Hans-Joachim Pöss
Franz Wagner
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.)
Vacuumschmelze GmbH and Co KG
Original Assignee
Vacuumschmelze GmbH and Co KG
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 Vacuumschmelze GmbH and Co KG filed Critical Vacuumschmelze GmbH and Co KG
Publication of EP1123550A1 publication Critical patent/EP1123550A1/en
Application granted granted Critical
Publication of EP1123550B1 publication Critical patent/EP1123550B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01F17/00—Fixed inductances of the signal type
    • H01F17/04—Fixed inductances of the signal type with magnetic core
    • H01F17/06—Fixed inductances of the signal type with magnetic core with core substantially closed in itself, e.g. toroid
    • H01F17/062—Toroidal core with turns of coil around it
    • 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
    • H01F17/06—Fixed inductances of the signal type with magnetic core with core substantially closed in itself, e.g. toroid
    • 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

Definitions

  • the invention relates to a device for steaming
  • Devices of this type are generally known and are used, for example, to suppress the feeding of interference voltages by network consumers into the network. For a good damping effect, it is necessary to achieve the highest possible impedance of the choke in the broadest possible frequency range.
  • the object of the invention is to create a device for damping interference voltages which has a high impedance in a broadly defined frequency range.
  • This object is achieved according to the invention in that tightly wound winding sections alternate with widely wound winding sections along each inductor.
  • each choke coil comprises tightly wound winding sections, the total number of turns is high, so that there is a high value for the inductance of the device.
  • the capacitance of the inductor is determined by the wide winding sections, so that overall there is a small capacitance value for each inductor. Both have the consequence that the resonances occurring due to the inductance and the capacitance have a large bandwidth and a large maximum value for the impedance. Appropriate dimensioning makes it possible to set the resonance frequencies of the device to values at which the spectrum of the interference signals has maxima. points, and in this way to optimize the suppression of the fault signals.
  • FIG. 1 is a plan view of a current compensated choke
  • FIG. 2 shows the impedance profile of the choke from FIG. 1, plotted against the frequency
  • FIG. 3 shows an equivalent circuit diagram for one of the choke coils of the choke from FIG. 1
  • FIG. 4 shows a basic circuit diagram for the choke from FIG. 1
  • FIG. 5 shows the course of the ratio of inductance to capacitance m as a function of the resonance frequency for an ideal and a real choke.
  • FIG. 1 shows a current-compensated choke 1 which has a toroidal core 2.
  • Choke coils 3 are wound on the toroidal core 2 and have tightly wound coil sectors 4 and winding gaps 5.
  • the current-compensated choke 1 is used to suppress asymmetrical interference voltages that arise on power lines.
  • the nominal current should not drive choke 1 to saturation.
  • the inductor 1 is connected to mains lines via connecting lines 6 in such a way that the flux generated by the nominal current m in the two inductor coils 3 in the toroidal core 2 is compensated for zero.
  • FIG. 2 shows with a dashed line 7 the course of the impedance of a choke without winding gap 5, which is not shown in the drawing.
  • the impedance curve 8 has a larger impedance maximum than the impedance curve 7.
  • the half-widths of the resonances in the impedance curve 8 are also larger than in the impedance curve.
  • the choke 1 with the winding gap 5 thus has higher values for the impedance in a larger frequency range with the same number of turns and the same toroid.
  • FIG. 3 shows an equivalent circuit diagram for the choke coil 3.
  • the inductors L1 to L3 and L5 to L7 illustrate the inductance of the turns in the coil sectors 4, whereas the inductance L4 represents the inductance of the winding gap 5.
  • the resistors Rl to R7 stand for the line resistances of the turns.
  • the capacitances Cwl to Cw3 and Cw5 to Cw7 represent the capacitances between adjacent turns in the coil sectors 4.
  • the capacitance Cw4 finally indicates the capacitance of the winding gap 5.
  • the toroidal core 2 is not an insulator, which is indicated in FIG. 3 by the resistors R12 to R78.
  • high-frequency voltage components couple into the toroidal core 2 via capacitors Ckl to Ck8.
  • the capacitance of the choke coil 3 is essentially equal to the capacitance Cw4 of the choke coil 3 m of the winding gap 5.
  • the inductance of the choke coil 3 is j edoch equal to the sum of the inductances Ll-L7.
  • the inductance L is the sum of the Induk TIVIT ⁇ ä th Ll-L7 in Figure 3.
  • a lead resistance R L shown is connected in parallel with a capacitance C.
  • the value of the capacitance C corresponds substantially to the value of the capacitance Cw4 from Fi ⁇ gur 3.
  • an impedance R P connected in parallel, the said toroidal core illustrating the above about 2 leading current path.
  • the m Pnnzipschaltsentaltsent Figure 4 shown is the Prin ⁇ zipschaltsent a lossy Parallelschwmgnikes. F o r the case where Rp is much greater than R L, is valid for the bandwidth
  • ⁇ f is the bandwidth and fo is the resonance frequency.
  • Dar ⁇ from follows that the bandwidth of at least disappear at dendem lead resistance R L and finite parallel resistance R P increases with an increasing ratio of the inductance L to capacitance C. Accordingly, it is Lich for a wide range erforder ⁇ , the inductance of the choke coil 3 as large as possible and the capacitance C 3 to make the choke coil as small as possible.
  • a soft magnetic nanocrystalline alloy is understood to mean, for example, the alloys known from EP 0 271 657 B1.
  • FIG. 5 finally shows how the ratio of L to C develops when the resonance frequency frj is increased for a given choke coil by reducing the capacitance C
  • a broken line 9 represents the ideal case of an inductance which is independent of the frequency
  • the solid curve 10 was calculated on the basis of measured values for the inductance of a choke coil.
  • FIG. 5 shows the straight-line increase in the double logarithmic representation of the ratio of the ideal frequency-dependent inductance L to the capacitance C.
  • the curve calculated from measured values runs essentially parallel to the ideal curve 9 between 100 Hz and 30 kHz, and then due to the at high frequencies, the inductances become smaller above 30 kHz and finally decrease for frequencies above 10 MHz. Up to this upper limit value, it is thus possible in the measured inductor 3, by forming a winding gap 5, the capacitance of the To reduce inductor 3 and thereby increase the maximum value and the bandwidth of the resonances.
  • the choke coil 3 is short-circuited via the toroid 2, particularly at high frequencies. This can be avoided by making the coil sectors 4 multi-layered and replacing them with pile windings in the extreme case. Because of the greater distance from the core, the outer layers of the pile winding no longer capacitively couple to the toroidal core 2, so that the inductor 3 is not short-circuited via the toroidal core 2 even at high frequencies.
  • the heap winding also results in a choke coil with high inductance and at the same time very small capacitance.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Details Of Television Scanning (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Generation Of Surge Voltage And Current (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

A reactance coil (1) has an annular core (2) on which reactance coils are wound. Said reactance coils (3) are divided up into coil sectors 6 (4) that are separated from each other by means of gaps (5) in the windings. The gaps (5) in the windings reduce reactance coil (3) capacity and the reactance coils (3) have resonances with higher maximum values for impedance and greater bandwidths.

Description

Beschreibungdescription
Vorrichtung zur Dampfung von StorspannungenDevice for damping interference voltages
Die Erfindung betrifft eine Vorrichtung zur Dampfung vonThe invention relates to a device for steaming
Storspannungen mit einem Magnetkern und wenigstens einer um den Magnetkern gewickelten Drosselspule mit einer Vielzahl von Windungen.Interference voltages with a magnetic core and at least one choke coil wound around the magnetic core with a large number of turns.
Derartige Vorrichtungen sind allgemein bekannt und werden beispielsweise dazu verwendet, das Einspeisen von Storspannungen durch Netzverbraucher ms Netz zu unterdrucken. Für eine gute Dampfungswirkung ist es erforderlich, eine möglichst hohe Impedanz der Drossel m einem möglichst breiten Frequenzbereich zu erzielen.Devices of this type are generally known and are used, for example, to suppress the feeding of interference voltages by network consumers into the network. For a good damping effect, it is necessary to achieve the highest possible impedance of the choke in the broadest possible frequency range.
Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, e ne Vorrichtung zur Dampfung von Storspannungen zu schaffen, die eine hohe Impedanz in einem brei- ten definierten Frequenzbereich aufweist.Based on this prior art, the object of the invention is to create a device for damping interference voltages which has a high impedance in a broadly defined frequency range.
Diese Aufgabe wird erfmdungsgemaß dadurch gelost, daß sich entlang jeder Drosselspule eng gewickelte Wicklungsabschnitte mit weit gewickelten Wicklungsabschnitten abwechseln.This object is achieved according to the invention in that tightly wound winding sections alternate with widely wound winding sections along each inductor.
Da jede Drosselspule eng gewickelte Wicklungsabschnitt umfaßt, ist die Zahl der Windungen insgesamt hoch, so daß sich ein hoher Wert für die Induktivität der Vorrichtung ergibt. Andererseits wird die Kapazität der Drosselspule durch die weit gewickelten Wicklungsabschnitte bestimmt, so daß sich insgesamt ein kleiner Kapazitatswert für jede Drosselspule ergibt. Beides hat zur Folge, daß die aufgrund der Induktivität und der Kapazität auftretenden Resonanzen eine große Bandbreite und einen großen Maximalwert für die Impedanz auf- weisen. Durch eine geeignete Dimensionierung ist es dabei möglich, die Resonanzfrequenzen der Vorrichtung auf Werte zu legen, bei denen das Spektrum der Storsignale Maxima auf- weist, und auf diese Weise die Unterdrückung der Storungs- signale zu optimieren.Since each choke coil comprises tightly wound winding sections, the total number of turns is high, so that there is a high value for the inductance of the device. On the other hand, the capacitance of the inductor is determined by the wide winding sections, so that overall there is a small capacitance value for each inductor. Both have the consequence that the resonances occurring due to the inductance and the capacitance have a large bandwidth and a large maximum value for the impedance. Appropriate dimensioning makes it possible to set the resonance frequencies of the device to values at which the spectrum of the interference signals has maxima. points, and in this way to optimize the suppression of the fault signals.
Weitere Ausfuhrungsbeispiele und vorteilhafte Ausgestaltungen s nd m den Unteranspruchen angegeben.Further exemplary embodiments and advantageous embodiments are specified in the subclaims.
Nachfolgend wird ein Ausfuhrungsbeispiel anhand der Zeichnung im einzelnen beschrieben. Es zeigen:An exemplary embodiment is described in detail below with reference to the drawing. Show it:
Figur 1 eine Draufsicht auf eine stromkompensierte Drossel; Figur 2 den Impedanzverlauf der Drossel aus Figur 1, aufgetragen über die Frequenz; Figur 3 ein Ersatzschaltbild für eine der Drosselspulen der Drossel aus Figur 1 ; Figur 4 ein Prinzipschaltbild für die Drossel aus Figur 1; und Figur 5 eine Darstellung des Verlaufs des Verhältnisses von Induktivität zur Kapazität m Abhängigkeit von der Resonanzfrequenz für eine ideelle und eine reelle Drossel.Figure 1 is a plan view of a current compensated choke; FIG. 2 shows the impedance profile of the choke from FIG. 1, plotted against the frequency; FIG. 3 shows an equivalent circuit diagram for one of the choke coils of the choke from FIG. 1; FIG. 4 shows a basic circuit diagram for the choke from FIG. 1; and FIG. 5 shows the course of the ratio of inductance to capacitance m as a function of the resonance frequency for an ideal and a real choke.
Figur 1 zeigt eine stromkompensierte Drossel 1, die einen Ringkern 2 aufweist. Auf den Ringkern 2 sind Drosselspulen 3 aufgewickelt, die über eng gewickelte Spulensektoren 4 sowie über Wicklungslucken 5 verfugen.FIG. 1 shows a current-compensated choke 1 which has a toroidal core 2. Choke coils 3 are wound on the toroidal core 2 and have tightly wound coil sectors 4 and winding gaps 5.
Die stromkompensierte Drossel 1 dient dazu, auf Netzleitungen entstehende asymmetrische Storspannungen zu unterdrucken. Dabei soll der Nennstrom die Drossel 1 nicht in Sättigung trei- ben. Zu diesem Zweck wird die Drossel 1 über Anschlußleitungen 6 so an Netzleitungen angeschlossen, daß sich der vom Nennstrom m den beiden Drosselspulen 3 erzeugte Fluß im Ringkern 2 zu Null kompensiert.The current-compensated choke 1 is used to suppress asymmetrical interference voltages that arise on power lines. The nominal current should not drive choke 1 to saturation. For this purpose, the inductor 1 is connected to mains lines via connecting lines 6 in such a way that the flux generated by the nominal current m in the two inductor coils 3 in the toroidal core 2 is compensated for zero.
Zur Unterdrückung asymmetrischer Storspannungen ist es nun erforderlich, daß die Drossel 1 m einem möglichst weiten Frequenzbereich eine möglichst hohe Impedanz aufweist. Figur 2 stellt mit einer gestrichelten Linie 7 den Verlauf der Impedanz einer in der Zeichnung nicht dargestellten Drossel ohne Wicklungslücke 5 dar. Im Vergleich dazu ist in Figur 2 mit einer durchgezogenen Kurve 8 der Impedanzverlauf der Drossel 1 dargestellt. Aus Figur 2 wird deutlich, daß die Impedanzkurve 8 ein größeres Impedanzmaximum aufweist als die Impedanzkurve 7. Auch die Halbwertsbreiten der Resonanzen sind bei der Impedanzkurve 8 größer als bei der Impedanzkurve . Im Vergleich zu einer Drossel ohne Wicklungslücke weist somit die Drossel 1 mit der Wicklungslücke 5 bei gleicher Windungszahl und gleichem Ringkern höhere Werte für die Impedanz in einem größeren Frequenzbereich auf.In order to suppress asymmetrical interference voltages, it is now necessary for the choke 1 m to have the highest possible impedance in the widest possible frequency range. FIG. 2 shows with a dashed line 7 the course of the impedance of a choke without winding gap 5, which is not shown in the drawing. In comparison with this, FIG. It is clear from FIG. 2 that the impedance curve 8 has a larger impedance maximum than the impedance curve 7. The half-widths of the resonances in the impedance curve 8 are also larger than in the impedance curve. Compared to a choke without a winding gap, the choke 1 with the winding gap 5 thus has higher values for the impedance in a larger frequency range with the same number of turns and the same toroid.
Dieser Effekt soll nun anhand Figur 3 bis 5 weiter erläutert werden.This effect will now be explained with reference to Figures 3 to 5.
Figur 3 zeigt ein Ersatzschaltbild für die Drosselspule 3. Die Induktivitäten Ll bis L3 sowie L5 bis L7 veranschaulichen die Induktivität der Windungen in den Spulensektoren 4 , wohingegen die Induktivität L4 die Induktivität der Wicklungslücke 5 darstellt. Die Widerstände Rl bis R7 stehen für die Leitungswiderstände der Windungen. In gleicher Weise stellen die Kapazitäten Cwl bis Cw3 sowie Cw5 bis Cw7 die Kapazitäten zwischen nebeneinanderliegenden Windungen in den Spulensektoren 4 dar. Die Kapazität Cw4 schließlich deutet die Kapazität der Wicklungslücke 5 an. Ferner ist in Figur 3 berücksichtigt, daß der Ringkern 2 kein Isolator ist, was in Figur 3 durch die Widerstände R12 bis R78 angedeutet ist. Insbesonde- re hochfrequente Spannungskomponenten koppeln über Kondensatoren Ckl bis Ck8 in den Ringkern 2 ein.FIG. 3 shows an equivalent circuit diagram for the choke coil 3. The inductors L1 to L3 and L5 to L7 illustrate the inductance of the turns in the coil sectors 4, whereas the inductance L4 represents the inductance of the winding gap 5. The resistors Rl to R7 stand for the line resistances of the turns. In the same way, the capacitances Cwl to Cw3 and Cw5 to Cw7 represent the capacitances between adjacent turns in the coil sectors 4. The capacitance Cw4 finally indicates the capacitance of the winding gap 5. It is also taken into account in FIG. 3 that the toroidal core 2 is not an insulator, which is indicated in FIG. 3 by the resistors R12 to R78. In particular, high-frequency voltage components couple into the toroidal core 2 via capacitors Ckl to Ck8.
Da die Kapazität Cw4 der Drosselspule 3 im Bereich der Wicklungslücke 5 wesentlich kleiner als die Kapazitäten Cwl bis Cw3 sowie Cw5 bis Cw7 ist, ist die Kapazität der Drosselspule 3 im wesentlichen gleich der Kapazität Cw4 der Drosselspule 3 m der Wicklungslucke 5. Die Induktivität der Drosselspule 3 ist jedoch gleich der Summe der Induktivitäten Ll bis L7.Since the capacitance Cw4 of the choke coil 3 in the area of the winding gap 5 is substantially smaller than the capacitances Cwl to Cw3 and Cw5 to Cw7, the capacitance of the choke coil 3 is essentially equal to the capacitance Cw4 of the choke coil 3 m of the winding gap 5. The inductance of the choke coil 3 is j edoch equal to the sum of the inductances Ll-L7.
Der sich aufgrund der Verkleinerung der Kapazität Cw4 erge- bende Effekt läßt sich nun anhand des in der Figur 4 darge¬ stellten Prinzipschaltbildes erklaren.The sic h due to the reduction of the capacity Cw4 erge- b border effect can now be based on the Darge in the figure 4 presented ¬ schematic circuit diagram explained.
In Figur 4 steht die Induktivität L für die Summe der Induk¬ tivitäten Ll bis L7 in Figur 3. Vor der Induktivität L ist m Figur 4 ein Leitungswiderstand RL eingezeichnet, zu dem eine Kapazität C parallel geschaltet ist. Der Wert der Kapazität C entspricht im wesentlichen dem Wert der Kapazität Cw4 aus Fi¬ gur 3. Außerdem ist zum Widerstand RL und der Induktivität L der Drosselspule 3 eine Impedanz RP parallel geschaltet, die den über den Ringkern 2 fuhrenden Strompfad verdeutlicht.In Figure 4, the inductance L is the sum of the Induk TIVIT ¬ ä th Ll-L7 in Figure 3. Before the inductance L m Figure 4 is a lead resistance R L shown, is connected in parallel with a capacitance C. The value of the capacitance C corresponds substantially to the value of the capacitance Cw4 from Fi ¬ gur 3. In addition to the resistance R L and the inductance L of the choke coil 3, an impedance R P connected in parallel, the said toroidal core illustrating the above about 2 leading current path.
Das m Figur 4 dargestellte Pnnzipschaltbild ist das Prin¬ zipschaltbild eines verlustbehafteten Parallelschwmgkreises . Für den Fall, daß Rp wesentlich großer als RL ist, gilt für die BandbreiteThe m Pnnzipschaltbild Figure 4 shown is the Prin ¬ zipschaltbild a lossy Parallelschwmgkreises. F o r the case where Rp is much greater than R L, is valid for the bandwidth
Δf (c 1 (L f0 LVL RP CΔf (c 1 (L f 0 L VL R P C
wobei Δf die Bandbreite und fo die Resonanzfrequenz ist. Dar¬ aus ergibt sich, daß die Bandbreite zumindest bei verschwin- dendem Leitungswiderstand RL und endlichem Parallelwiderstand RP mit zunehmendem Verhältnis von Induktivität L zu Kapazität C wachst. Demnach ist es für eine große Bandbreite erforder¬ lich, die Induktivität der Drosselspule 3 möglichst groß und die Kapazität C der Drosselspule 3 möglichst klein zu machen.where Δf is the bandwidth and fo is the resonance frequency. Dar ¬ from follows that the bandwidth of at least disappear at dendem lead resistance R L and finite parallel resistance R P increases with an increasing ratio of the inductance L to capacitance C. Accordingly, it is Lich for a wide range erforder ¬, the inductance of the choke coil 3 as large as possible and the capacitance C 3 to make the choke coil as small as possible.
Für die Impendanz bei der Resonanzfrequenz ergibt sich unter der Bedingung, daß Rp sehr viel größer als RL ist, die FormelF o r the impedance at the resonance frequency is obtained under the condition that Rp is much greater than R L has the formula
LL
Anhand dieser Formel wird deutlich, daß der Resonanzwiderstand ebenfalls mit wachsendem Verhältnis von Induktivität L zu Kapazität C zunimmt. Um große Maximalwerte bei den Reso- nanzfrequenzen für die Impendanz zu erzielen, ist es demnach wiederum erforderlich, die Induktivität L möglichst groß und die Kapazität C möglichst klein werden zu lassen. This formula shows that the resonance resistance also increases with the increasing ratio of inductance L to capacitance C. In order to achieve large maximum values for the resonance frequencies for the impedance, it is again necessary to make the inductance L as large as possible and the capacitance C to be as small as possible.
Anhand der beiden Formeln wird auch deutlich, daß der be- schriebene Effekt von gleichzeitiger Erhöhung von Bandbreite und Resonanzwiderstand nur auftritt, wenn der Parallelwiderstand Rp nicht allzu hohe Werte annimmt. Da die spezifischen Widerstände von Ferriten wesentlich größer als die spezifischen Widerstände von weichmagnetischen nanokristallinen Le- gierungen sind, sind die beschriebenen Effekte bei mit Ferritkernen ausgestatteten Drosselspulen wesentlich schwächer. Unter einer weichmagnetischen nanokristallinen Legierung werden dabei beispielsweise die aus der EP 0 271 657 Bl bekannten Legierungen verstanden.The two formulas also make it clear that the described effect of simultaneous increase in bandwidth and resonance resistance only occurs if the parallel resistance Rp does not assume too high values. Since the specific resistances of ferrites are significantly larger than the specific resistances of soft magnetic nanocrystalline alloys, the effects described are much weaker in choke coils equipped with ferrite cores. A soft magnetic nanocrystalline alloy is understood to mean, for example, the alloys known from EP 0 271 657 B1.
Figur 5 schließlich zeigt, wie sich das Verhältnis von L zu C entwickelt, wenn bei einer gegebenen Drosselspule durch Verringern der Kapazität C die Resonanzfrequenz frj erhöht wird, wobei in Figur 5 eine gestrichelte Linie 9 den idealen Fall einer von der Frequenz unabhängigen Induktivität darstellt, während die durchgezogene Kurve 10 aufgrund von Meßwerten für die Induktivität einer Drosselspule berechnet wurde. Man erkennt in Figur 5 den in der doppellogarithmischen Darstellung geradlinigen Anstieg des Verhältnisses der idealen frequen- zunabhängigen Induktivität L zur Kapazität C. Die aus Meßwerten errechnete Kurve verläuft zwischen 100 Hz und 30 kHz im wesentlichen parallel zur idealen Kurve 9, um dann aufgrund der bei hohen Frequenzen kleiner werdenden Induktivitäten oberhalb von 30 kHz abzuflachen und schließlich für Frequen- zen über 10 MHz abzufallen. Bis zu diesem oberen Grenzwert ist es somit bei der vermessenen Drosselspule 3 möglich, durch Ausbilden einer Wicklungslücke 5 die Kapazität der Drosselspule 3 zu verringern und dadurch den Maximalwert und die Bandbreite der Resonanzen zu erhöhen.FIG. 5 finally shows how the ratio of L to C develops when the resonance frequency frj is increased for a given choke coil by reducing the capacitance C, in FIG. 5 a broken line 9 represents the ideal case of an inductance which is independent of the frequency, while the solid curve 10 was calculated on the basis of measured values for the inductance of a choke coil. FIG. 5 shows the straight-line increase in the double logarithmic representation of the ratio of the ideal frequency-dependent inductance L to the capacitance C. The curve calculated from measured values runs essentially parallel to the ideal curve 9 between 100 Hz and 30 kHz, and then due to the at high frequencies, the inductances become smaller above 30 kHz and finally decrease for frequencies above 10 MHz. Up to this upper limit value, it is thus possible in the measured inductor 3, by forming a winding gap 5, the capacitance of the To reduce inductor 3 and thereby increase the maximum value and the bandwidth of the resonances.
Durch eine geeignete Dimensionierung von Windungszahlen und Abmessungen von Spulensektoren 4 ist es dabei möglich, in Frequenzbereichen, in denen die Störsignale starke Frequenzkomponenten aufweisen, Resonanzen der Drosselspule 3 zu legen und auf diese Weise die in diesem Frequenzbereich auftretenden Störsignale auf wirksame Weise zu unterdrücken.By appropriately dimensioning the number of turns and dimensions of coil sectors 4, it is possible to place resonances of the choke coil 3 in frequency ranges in which the interference signals have strong frequency components, and in this way to effectively suppress the interference signals occurring in this frequency range.
Dabei ist jedoch zu beachten, daß insbesondere bei hohen Frequenzen die Drosselspule 3 über den Ringkern 2 kurzgeschlossen wird. Dies läßt sich vermeiden, indem die Spulensektoren 4 mehrlagig ausgeführt werden und im äußersten Fall durch Haufenwicklungen ersetzt werden. Aufgrund des größeren Ab- stands zum Kern koppeln die äußeren Lagen der Haufenwicklung nicht mehr kapazitiv mit dem Ringskern 2, so daß die Drosselspule 3 auch bei hohen Frequenzen nicht über den Ringkern 2 kurzgeschlossen wird. Durch die Haufenwicklung ergibt sich außerdem eine Drosselspule mit großer Induktivität bei gleichzeitig sehr kleiner Kapazität.It should be noted, however, that the choke coil 3 is short-circuited via the toroid 2, particularly at high frequencies. This can be avoided by making the coil sectors 4 multi-layered and replacing them with pile windings in the extreme case. Because of the greater distance from the core, the outer layers of the pile winding no longer capacitively couple to the toroidal core 2, so that the inductor 3 is not short-circuited via the toroidal core 2 even at high frequencies. The heap winding also results in a choke coil with high inductance and at the same time very small capacitance.
Es sei angemerkt, daß die ausgeführten Erläuterungen nicht nur für stromkompensierte Drosseln mit zwei Phasen gelten, sondern auch für Drosseln mit drei oder mehr Phasen uneingeschränkt gültig sind. It should be noted that the explanations given apply not only to current-compensated chokes with two phases, but also apply without restriction to chokes with three or more phases.

Claims

Patentansprüche claims
1. Vorrichtung zur Dämpfung von Störspannungen mit einem Magnetkern (2) und wenigstens einer um den Magnetkern gewik- kelten Drosselspule (3) mit einer Vielzahl von Windungen, dadurch gekennzeichnet, daß sich entlang jeder Drosselspule (3) eng gewickelte Wick- lungsabschnitte (4) mit weit gewickeltem Wicklungsabschnitten (5) abwechseln.1. Device for damping interference voltages with a magnetic core (2) and at least one choke coil (3) wound around the magnetic core with a plurality of windings, characterized in that tightly wound winding sections (4.) Are along each choke coil (3) ) alternate with wide winding sections (5).
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Magnetkern (2) aus einer weichmagnetischen nanokristallinen Legierung gefertigt ist.2. Device according to claim 1, characterized in that the magnetic core (2) is made of a soft magnetic nanocrystalline alloy.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Magnetkern ein Ringkern (2) ist.3. Device according to claim 1 or 2, characterized in that the magnetic core is a ring core (2).
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß zwei Drosselspulen (3) auf den Magnetkern (2) aufgebracht sind.4. The device according to claim 3, characterized in that two choke coils (3) are applied to the magnetic core (2).
5. Vorrichtung nach Anspruch 3 , dadurch gekennzeichnet, daß drei Drosselspulen (3) auf den Magnetkern (2) aufgebracht sind.5. The device according to claim 3, characterized in that three choke coils (3) are applied to the magnetic core (2).
6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Drosselspulen (3) sektoriert auf den Magnetkern (2) aufgewickelt sind. 6. Device according to one of claims 1 to 5, characterized in that the choke coils (3) are wound onto the magnetic core (2) in sectors.
7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß jede Drosselspule (3) mehrlagig um den Magnetkern (2) gewickelt ist. 7. Device according to one of claims 1 to 6, characterized in that each inductor (3) is wound in multiple layers around the magnetic core (2).
EP99960802A 1998-10-22 1999-10-21 Device for attenuating parasitic voltages Expired - Lifetime EP1123550B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19848827 1998-10-22
DE19848827A DE19848827A1 (en) 1998-10-22 1998-10-22 Device for damping interference voltages
PCT/DE1999/003382 WO2000025329A1 (en) 1998-10-22 1999-10-21 Device for attenuating parasitic voltages

Publications (2)

Publication Number Publication Date
EP1123550A1 true EP1123550A1 (en) 2001-08-16
EP1123550B1 EP1123550B1 (en) 2005-12-28

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EP99960802A Expired - Lifetime EP1123550B1 (en) 1998-10-22 1999-10-21 Device for attenuating parasitic voltages

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US (1) US6483279B1 (en)
EP (1) EP1123550B1 (en)
AT (1) ATE314724T1 (en)
DE (2) DE19848827A1 (en)
WO (1) WO2000025329A1 (en)

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Also Published As

Publication number Publication date
WO2000025329A1 (en) 2000-05-04
DE59912992D1 (en) 2006-02-02
EP1123550B1 (en) 2005-12-28
ATE314724T1 (en) 2006-01-15
DE19848827A1 (en) 2000-05-04
US6483279B1 (en) 2002-11-19

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