EP0780854A1 - Current-compensated radio interference suppression choke - Google Patents

Current-compensated radio interference suppression choke Download PDF

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Publication number
EP0780854A1
EP0780854A1 EP96119304A EP96119304A EP0780854A1 EP 0780854 A1 EP0780854 A1 EP 0780854A1 EP 96119304 A EP96119304 A EP 96119304A EP 96119304 A EP96119304 A EP 96119304A EP 0780854 A1 EP0780854 A1 EP 0780854A1
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EP
European Patent Office
Prior art keywords
interference suppression
radio interference
core
suppression choke
permeability
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP96119304A
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German (de)
French (fr)
Inventor
Martin Dr. Ferch
Gerhard Hinz
Giselher Dr. Herzer
Hans-Joachim Pöss
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
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Vacuumschmelze GmbH and Co KG
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Filing date
Publication date
Application filed by Vacuumschmelze GmbH and Co KG filed Critical Vacuumschmelze GmbH and Co KG
Publication of EP0780854A1 publication Critical patent/EP0780854A1/en
Withdrawn legal-status Critical Current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
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15308—Amorphous metallic alloys, e.g. glassy metals based on Fe/Ni
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15333—Amorphous metallic alloys, e.g. glassy metals containing nanocrystallites, e.g. obtained by annealing
    • 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 current-compensated radio interference suppression choke with a soft magnetic core for switching into the feed lines of a power electronics device.
  • a current-compensated radio interference suppression choke is described for example in DE-A 35 26 047.
  • the windings of this choke are switched so that the magnetic fluxes, which are induced due to the operating current, cancel each other out, while interference currents that flow in phase through both windings result in magnetization of the soft magnetic core.
  • the resulting current-compensated radio interference suppression choke acts as a very small inductive resistor in relation to the operating currents, while interference currents, which originate, for example, from connected devices and close over ground, meet with a very high inductance.
  • the core of the known current-compensated radio interference suppression choke is wound, for example, from an amorphous band.
  • a very high permeability is achieved, which allows a high damping effect to be achieved with a small construction volume of the radio interference suppression choke.
  • This is mainly due to the fact that the inductance of the choke depends not only on the number of turns and the core cross section, but essentially on the relative permeability of the soft magnetic material of the magnetic core.
  • the object of the present invention is now to provide a radio interference suppression choke which has a good interference suppression effect even with such consumers, without requiring particularly large dimensions due to an increase in the number of turns and / or core cross section.
  • the solution to this problem consists according to the invention in the choice of a core material for the soft magnetic core of a current-compensated choke with the features as listed in the characterizing part of patent claim 1. It is particularly advantageous if the core material consists of certain alloys specified in the subclaims and if the magnetic characteristic of this material is set accordingly by the measures mentioned there.
  • the field is then applied in such a way that it acts as a transverse field, that is, the direction of magnetization of the applied field is transverse to the later direction of magnetization of the wound toroid.
  • the nanocrystalline alloys described have a relatively high specific electrical Resistance R> 90 ⁇ cm. This limits the eddy current losses in the core caused by interference currents and can therefore also be used in relatively small sizes with regard to heating.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Dispersion Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

The choke coil is inserted in the supply lines to a power electronic device and has a sift magnetic core made of a material with a magnetic permeability of between 10.000 and 60,000, a saturation inductance of greater than 1 Tesla and a specific resistance of less than 90 micro-ohm cm. The core material may have a nanocrystalline structure provided by an alloy of Fe, Cu, one or more elements in the group containing Nb,Ta,Mo,Zr, or other transition metals, Co and/or Ni and C or Ge.

Description

Die Erfindung betrifft eine stromkompensierte Funkentstördrossel mit einem weichmagnetischen Kern zur Einschaltung in die Einspeiseleitungen eines Gerätes der Leistungselektronik.The invention relates to a current-compensated radio interference suppression choke with a soft magnetic core for switching into the feed lines of a power electronics device.

Eine stromkompensierte Funkentstördrossel ist beispielsweise in DE-A 35 26 047 beschrieben. Die Wicklungen dieser Drossel sind so geschaltet, daß sich die magnetischen Flüsse, die aufgrund des Betriebsstromes induziert werden, gegenseitig aufheben, während Störströme, die gleichphasig durch beide Wicklungen fließen, eine Magnetisierung des weichmagnetischen Kerns zur Folge haben. Hierdurch wirkt die somit entstandene stromkompensierte Funkentstördrossel als sehr kleiner induktiver Widerstand in Bezug auf die Betriebsströme, während Störströme, die beispielsweise von angeschlossenen Geräten ausgehen und sich über Erde schließen, auf eine sehr hohe Induktivität treffen.A current-compensated radio interference suppression choke is described for example in DE-A 35 26 047. The windings of this choke are switched so that the magnetic fluxes, which are induced due to the operating current, cancel each other out, while interference currents that flow in phase through both windings result in magnetization of the soft magnetic core. As a result, the resulting current-compensated radio interference suppression choke acts as a very small inductive resistor in relation to the operating currents, while interference currents, which originate, for example, from connected devices and close over ground, meet with a very high inductance.

Der Kern der bekannten stromkompensierten Funkentstördrossel ist beispielsweise aus einem amorphen Band gewickelt. Hierdurch erreicht man eine sehr hohe Permeabilität, die es gestattet, bei kleinem Bauvolumen der Funkentstördrossel eine hohe Dämpfungswirkung zu erzielen. Dies liegt vor allem daran, daß die Induktivität der Drossel neben Windungszahl und Kernquerschnitt im wesentlichen von der relativen Permeabilität des weichmagnetischen Materials des Magnetkerns abhängt.The core of the known current-compensated radio interference suppression choke is wound, for example, from an amorphous band. In this way, a very high permeability is achieved, which allows a high damping effect to be achieved with a small construction volume of the radio interference suppression choke. This is mainly due to the fact that the inductance of the choke depends not only on the number of turns and the core cross section, but essentially on the relative permeability of the soft magnetic material of the magnetic core.

Setzt man derartige stromkompensierte Funkentstördrosseln ein für Verbraucher, die über gesteuerte Gleich- und Wechselrichter oder eine entsprechende gesteuerte Leistungselektronik an das Netz angeschlossen sind, so stellt man - insbesondere bei langen Leitungen zwischen Leistungselektronik und Verbraucher - fest, daß beim Erproben verschiedener Drosseln mit unterschiedlicher Bewicklung, Kerngröße und Kernmaterial eine Erhöhung der Permeabillität des eingesetzten Kernmaterials in manchen Fällen zu einer deutlichen Verschlechterung der Entstörwirkung führt.If one uses such current-compensated radio interference suppression chokes for consumers that are connected to the network via controlled rectifiers and inverters or a correspondingly controlled power electronics system, it is found - especially with long lines between power electronics and consumer systems - that when testing different chokes with different winding , Core size and core material an increase in the permeability of the core material used in some cases leads to a significant deterioration in the interference suppression effect.

Um diesen Effekt zu vermeiden, kann man auf Kernmaterial mit niedriger Permeabilität zurückgreifen. Dies hat allerdings zur Folge, daß man zur Einhaltung einer bestimmten Mindestinduktivität entweder die Windungszahl erhöhen und/oder den Kernquerschnitt vergrößern muß, so daß zur Gewährleistung der Entstörwirkung für derartige, über eine Leistungselektronik gesteuerte oder geregelte Verbraucher wesentlich größere und teurere Entstördrosseln erforderlich werden.In order to avoid this effect, core material with low permeability can be used. However, this has the consequence that in order to maintain a certain minimum inductance, either the number of turns and / or the core cross-section must be increased, so that much larger and more expensive interference suppression chokes are required to ensure the interference suppression for such consumers controlled or regulated by power electronics.

Aufgabe der vorliegenden Erfindung ist es nun, eine Funkentstördrossel anzugeben, die auch bei derartigen Verbrauchern eine gute Entstörwirkung hat, ohne daß besonders große Abmessungen, bedingt durch Erhöhung von Windungszahl und/oder Kernquerschnitt erforderlich werden.The object of the present invention is now to provide a radio interference suppression choke which has a good interference suppression effect even with such consumers, without requiring particularly large dimensions due to an increase in the number of turns and / or core cross section.

Die Lösung dieser Aufgabe besteht erfindungsgemäß in der Wahl eines Kernwerkstoffes für den weichmagnetischen Kern einer stromkompensierten Drossel mit den Merkmalen, wie sie im Kennzeichen des Patentanspruchs 1 aufgeführt sind. Besonders vorteilhaft ist es, wenn der Kernwerkstoff aus bestimmten, in den Unteransprüchen angegebenen Legierungen besteht und wenn die magnetische Kennlinie dieses Werkstoffes durch die dort genannten Maßnahmen entsprechend eingestellt ist.The solution to this problem consists according to the invention in the choice of a core material for the soft magnetic core of a current-compensated choke with the features as listed in the characterizing part of patent claim 1. It is particularly advantageous if the core material consists of certain alloys specified in the subclaims and if the magnetic characteristic of this material is set accordingly by the measures mentioned there.

Nanokristalline Legierungen, die zum Einsatz als Kernwerkstoff für eine erfindungsgemäße Funkentstördrossel vorteilhafterweise eingesetzt werden können, werden so hergestellt, daß man zunächst eine Legierung mit der Formel: Fe 100-a-b-c-x-y-z Cua Rb Mc Six By Xz herstellt, wobei mit

  • R = eines oder mehrere der Elemente Nb, Ta, Mo, Zr und/oder anderer Übergangsmetalle der Nebengruppen IVb, Vb und VIb bezeichnet ist,
  • M = Co und/oder Ni bedeutet und mit
  • X = C, Ge und/oder andere Elemente der Hauptgruppen IIIa IVa Va bezeichnet ist. In der Formel gelten für die prozentualen Anteile der Elemente in at%:
  • a = 0 - 2; b = 2 - 10; c = 0 - 20; x = 0 - 18;y = 2 - 14;
  • z = 0 - 5 und 7 < b+x+y+z < 30. Diese Legierung wird in einem Tiegel verflüssigt. Aus dem Tiegel wird die Legierung auf eine sich drehende Kühltrommel aufgebracht, wo sie zu einem amorphen Band erstarrt. Dieses amorphe Band ist duktil und kann leicht zu Ringbandkernen gewickelt werden. Die nanokristalline Struktur im Kernwerkstoff wird dann durch eine Wärmebehandlung eingestellt, die abhängig von der Kristallisationstemperatur des Werkstoffes ist und mindestens 5 min bis max. etwa 8 h dauern kann. Je nach Kristallisationstemperatur der betreffenden angewendeten Legierung findet die Wärmebehandlung in einem Temperaturbereich von 470 bis 680 °C statt. Um die angestrebten relativen Permeabilitätswerte zwischen 10 000 und 60 000 zu erreichen, wird mindestens während eines Teils der Wärmebehandlungszeit ein magnetisches Feld angelegt.
Nanocrystalline alloys, which can advantageously be used as a core material for a radio interference suppression choke according to the invention, are produced by first producing an alloy with the formula: Fe 100-abcxyz Cu a R b M c Si x B y X z , with
  • R = one or more of the elements Nb, Ta, Mo, Zr and / or other transition metals of the subgroups IVb, Vb and VIb is designated,
  • M = Co and / or Ni and with
  • X = C, Ge and / or other elements of the main groups IIIa IVa Va. In the formula, the following applies to the percentage of elements in at%:
  • a = 0-2; b = 2-10; c = 0-20; x = 0-18; y = 2-14;
  • z = 0 - 5 and 7 <b + x + y + z <30. This alloy is liquefied in a crucible. The alloy is applied from the crucible to a rotating cooling drum, where it solidifies into an amorphous band. This amorphous band is ductile and can be easily wound into ring band cores. The nanocrystalline structure in the core material is then set by a heat treatment, which is dependent on the crystallization temperature of the material and at least 5 minutes to max. can take about 8 hours. Depending on the crystallization temperature of the alloy used, the heat treatment takes place in a temperature range from 470 to 680 ° C. In order to achieve the desired relative permeability values between 10,000 and 60,000, a magnetic field is applied at least during part of the heat treatment time.

Zur Verminderung der Permeabilität wird das Feld dann so angelegt, daß es als Querfeld wirkt, also die Magnetisierungsrichtung des angelegten Feldes quer zur späteren Magnetisierungsrichtung des gewickelten Ringbandkerns verläuft. Die beschriebenen nanokristallinen Legierungen haben einen relativ hohen spezifischen elektrischen Widerstand R > 90 µΩcm. Dadurch werden die durch Störströme entstehenden Wirbelstromverluste im Kern begrenzt und damit auch im Hinblick auf die Erwärmung relativ kleine Baugrößen einsetzbar.To reduce the permeability, the field is then applied in such a way that it acts as a transverse field, that is, the direction of magnetization of the applied field is transverse to the later direction of magnetization of the wound toroid. The nanocrystalline alloys described have a relatively high specific electrical Resistance R> 90 µΩcm. This limits the eddy current losses in the core caused by interference currents and can therefore also be used in relatively small sizes with regard to heating.

Durch Teilluftspalte, unterschiedliche Behandlung von Teilen des Ringbandkerns oder ähnliche Maßnahmen kann man mit besonderem Vorteil erreichen, daß sich eine magnetische Kennlinie für den weichmagnetischen Kern ergibt, die bei kleiner Vormagnetisierung zunächst eine hohe relative Permeabilität im Bereich von 20 000 bis 60 000 aufweist, die dann bis zum Erreichen der Sättigung bei höherer Vormagnetisierung um mindestens 30 % bezogen auf den Ausgangswert abfällt, so daß diese Permeabilität sich auf einen Wert zwischen 10 000 und 40 000 einstellt.By partial air gaps, different treatment of parts of the toroidal core or similar measures can be achieved with particular advantage that there is a magnetic characteristic for the soft magnetic core, which initially has a high relative permeability in the range of 20,000 to 60,000 with small bias, which then drops to at least 30% based on the initial value until saturation is reached with higher bias, so that this permeability is set to a value between 10,000 and 40,000.

Claims (5)

Stromkompensierte Funkentstördrossel mit einem weichmagnetischen Kern zur Einschaltung in die Einspeiseleitungen, eines Gerätes der Leistungselektronik dadurch gekennzeichnet, daß der eingesetzte Kernwerkstoff eine Permeabilität im Bereich von 10.000 bis 60.000, eine Sättigungsinduktion von > 1 Tesla und einen spezifischen Widerstand > 90 µΩcm aufweist.Current-compensated radio interference suppression choke with a soft magnetic core for switching into the feed lines, a device of power electronics, characterized in that the core material used has a permeability in the range of 10,000 to 60,000, a saturation induction of> 1 Tesla and a specific resistance> 90 µΩcm. Funkentstördrossel nach Anspruch 1, dadurch gekennzeichnet , daß der eingesetzte Kernwerkstoff eine nanokristalline Struktur und eine Legierungszusammensetzung Fe100-a-b-c-x-y-z Cua Rb Mc Six By Xz aufweist mit R: eines oder mehrere der Elemente Nb, Ta, Mo, Zr und/oder anderer Übergangsmetalle der Nebengruppen Ivb, Vb und Vib; M: Co und/oder Ni; X: C, Ge und/oder anderer Elemente der Hauptgruppen IIIa, IVa, Va und a = 0 - 2 at.%; b = 2 - 10 at.-%; c = 0 - 20 at.-%; x = 0 - 18 at.-%;y = 2 - 14 at.-%; z = 0 - 5 at.-% ist mit 7 < b+x+y+z < 30. Radio interference suppression choke according to Claim 1, characterized in that the core material used has a nanocrystalline structure and an alloy composition Fe 100-abcxyz Cu a R b M c Si x B y X z with R: one or more of the elements Nb, Ta, Mo, Zr and / or other transition metals of the sub-groups Ivb, Vb and Vib; M: Co and / or Ni; X: C, Ge and / or other elements of the main groups IIIa, IVa, Va and a = 0 - 2 at.%; b = 2-10 at%; c = 0-20 at%; x = 0-18 at%; y = 2-14 at%; z = 0 - 5 at .-% with 7 <b + x + y + z <30. Funkentstördrossel nach Anspruch 2, dadurch gekennzeichnet , daß das Material des Kerns einer Wärmebehandlung unterzogen wird für einen Zeitraum von mindestens 5 min und im Maximum 8 h in einem Temperaturbereich von 470 bis 680 °C.Radio interference suppression choke according to Claim 2, characterized in that the material of the core is subjected to a heat treatment for a period of at least 5 min and a maximum of 8 h in a temperature range from 470 to 680 ° C. Funkentstördrossel nach Anspruch 3, dadurch gekennzeichnet , daß die Wärmebehandlung zu mindestens 25 % der Temperzeit in einem Magnetfeld senkrecht zu der im Betrieb auftretenden Magnetisierungsrichtung (Querfeld) stattfindet.Radio interference suppression choke according to Claim 3, characterized in that the heat treatment takes place at least 25% of the annealing time in a magnetic field perpendicular to the direction of magnetization (transverse field) occurring during operation. Funkentstördrossel nach Anspruch 1, dadurch gekennzeichnet , daß durch eine Wärmebehandung oder konstruktive Maßnahmen ein weichmagnetischer Kern eingesetzt ist, dessen magnetische Kennlinie eine nichtlineare Charakteristik aufweist, derart, daß die Permeabilität bei geringer Vormagnetisierung innerhalb eines Niveaus von 20 000 bis 60 000 liegt und daß bei erhöhter Vormagnetisierung bis zu etwa 95 % der Sättigung des Kerns diese Permeabilität um mindestens 30 % abfällt.Radio interference suppression choke according to claim 1, characterized in that a soft magnetic core is used by a heat treatment or constructive measures, the magnetic characteristic curve of which has a non-linear characteristic, such that the permeability with low bias is within a level of 20,000 to 60,000 and that increased bias up to about 95% of the saturation of the core this permeability drops by at least 30%.
EP96119304A 1995-12-22 1996-12-02 Current-compensated radio interference suppression choke Withdrawn EP0780854A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19548530 1995-12-22
DE1995148530 DE19548530A1 (en) 1995-12-22 1995-12-22 Current-compensated radio interference suppression choke

Publications (1)

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EP0780854A1 true EP0780854A1 (en) 1997-06-25

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JP (1) JPH09190910A (en)
DE (1) DE19548530A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999045643A2 (en) * 1998-03-03 1999-09-10 Vacuumschmelze Gmbh Low-pass filter for a diplexer
RU202587U1 (en) * 2020-03-24 2021-02-25 Юрий Пантелеевич Лепеха ELECTROMAGNETIC INTERFERENCE DEVICE
RU203984U1 (en) * 2021-02-04 2021-05-04 Юрий Пантелеевич Лепеха SYNPHASE INTERFERENCE THROTTLE

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19926699C2 (en) 1999-06-11 2003-10-30 Vacuumschmelze Gmbh High-pass branch of a crossover for ADSL systems
KR101140912B1 (en) 2003-04-02 2012-05-03 바쿰슈멜체 게엠베하 운트 코. 카게 Magnet core, method for production of such a magnet core, applications of such a magnet core, especially in current transformers and current-compensated inductors, as well as alloys and bands for production of such a magnet core
DE102015200666A1 (en) 2015-01-16 2016-08-18 Vacuumschmelze Gmbh & Co. Kg Magnetic core, method for producing such a magnetic core and method for producing an electrical or electronic assembly with such a magnetic core

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Publication number Priority date Publication date Assignee Title
DE3435519A1 (en) * 1983-09-28 1985-04-11 Kabushiki Kaisha Toshiba, Kawasaki, Kanagawa Reactor
DE3526047A1 (en) 1985-07-20 1987-01-22 Vacuumschmelze Gmbh CURRENT COMPENSATING RADIO INTERFERENCE THROTTLE
EP0635853A2 (en) * 1993-07-21 1995-01-25 Hitachi Metals, Ltd. Nanocrystalline alloy having pulse attenuation characteristics, method of producing the same, choke coil, and noise filter
EP0655753A1 (en) * 1993-11-26 1995-05-31 Hitachi Metals, Ltd. Active filter circuit and power supply apparatus including same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3435519A1 (en) * 1983-09-28 1985-04-11 Kabushiki Kaisha Toshiba, Kawasaki, Kanagawa Reactor
DE3526047A1 (en) 1985-07-20 1987-01-22 Vacuumschmelze Gmbh CURRENT COMPENSATING RADIO INTERFERENCE THROTTLE
EP0635853A2 (en) * 1993-07-21 1995-01-25 Hitachi Metals, Ltd. Nanocrystalline alloy having pulse attenuation characteristics, method of producing the same, choke coil, and noise filter
EP0655753A1 (en) * 1993-11-26 1995-05-31 Hitachi Metals, Ltd. Active filter circuit and power supply apparatus including same

Non-Patent Citations (2)

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Title
R.BOLL: "Weichmagnetische Werkstoffe", 1990, VACUUMSCHMELZE GMBH, HANAU DE, XP002026662 *
YOSHIZAWA Y ET AL: "EFFECTS OF MAGNETIC FIELD ANNEALING ON MAGNETIC PROPERTIES IN ULTRAFINE CRYSTALLINE FE-CU-NB-SI-B ALLOYS", IEEE TRANSACTIONS ON MAGNETICS, vol. 25, no. 5, 1 September 1989 (1989-09-01), pages 3324 - 3326, XP000069103 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999045643A2 (en) * 1998-03-03 1999-09-10 Vacuumschmelze Gmbh Low-pass filter for a diplexer
WO1999045643A3 (en) * 1998-03-03 1999-10-28 Vacuumschmelze Gmbh Low-pass filter for a diplexer
US6559808B1 (en) 1998-03-03 2003-05-06 Vacuumschmelze Gmbh Low-pass filter for a diplexer
RU202587U1 (en) * 2020-03-24 2021-02-25 Юрий Пантелеевич Лепеха ELECTROMAGNETIC INTERFERENCE DEVICE
RU203984U1 (en) * 2021-02-04 2021-05-04 Юрий Пантелеевич Лепеха SYNPHASE INTERFERENCE THROTTLE

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Publication number Publication date
DE19548530A1 (en) 1997-06-26
JPH09190910A (en) 1997-07-22

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