EP0392202A2 - Application d'un alliage à base de fer, à cristallinité fine comme noyau magnétique pour un transformateur d'interface - Google Patents

Application d'un alliage à base de fer, à cristallinité fine comme noyau magnétique pour un transformateur d'interface Download PDF

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Publication number
EP0392202A2
EP0392202A2 EP90104796A EP90104796A EP0392202A2 EP 0392202 A2 EP0392202 A2 EP 0392202A2 EP 90104796 A EP90104796 A EP 90104796A EP 90104796 A EP90104796 A EP 90104796A EP 0392202 A2 EP0392202 A2 EP 0392202A2
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EP
European Patent Office
Prior art keywords
interface
transformers
atomic
inductance
magnetic core
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
EP90104796A
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German (de)
English (en)
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EP0392202B1 (fr
EP0392202A3 (fr
Inventor
Johannes Binkofski
Dietmar Grätzer
Giselher Dr. Herzer
Hans-Reiner Dr. Hilzinger
Jörg Dr. Petzold
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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Application filed by Vacuumschmelze GmbH and Co KG filed Critical Vacuumschmelze GmbH and Co KG
Publication of EP0392202A2 publication Critical patent/EP0392202A2/fr
Publication of EP0392202A3 publication Critical patent/EP0392202A3/fr
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Publication of EP0392202B1 publication Critical patent/EP0392202B1/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • 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

Definitions

  • the invention relates to a magnetic core for an interface transmitter according to the preamble of claim 1.
  • Such an interface transmitter is used, for example, in the so-called S0 interface of the ISDN network as a transmitter at the interface between the network termination and the individual terminals.
  • ISDN is a new, global, digital communication system.
  • the connection between a digital local exchange and a so-called network termination is made via a U k0 line interface .
  • the distance between the digital local exchange and a network termination can be max. 8 km.
  • Up to 8 end devices can be connected to a single network termination.
  • the end devices can be, for example, telephone, screen telephone, screen text, facsimile, text fax, work station etc.
  • the end devices can in turn be up to 150 m away from the respective network termination.
  • the interface between the network termination and the end devices is referred to as the S0 user interface.
  • Whether a digital pulse can be transmitted within the specified pulse mask essentially depends on the inductance and the capacitance values of the transmitter.
  • the inductance L of the transmitter essentially determines the roof drop of the transmitted pulse. Roof waste is the undesired decrease in the voltage of the transmitted pulse during the pulse duration.
  • the inductance of the transmitter In order to meet the ISDN requirements, the inductance of the transmitter must be greater than approximately 20 mH at 10 kHz.
  • the capacitance values of the transmitter have an effect on the signal shape of the transmitted pulse, in particular when changing from the high to the low state. Here, the lowest possible values for the coupling capacity are required.
  • the coupling capacitance is the capacity between two different windings of the transformer.
  • the coupling capacity depends, among other things, on the number of turns applied and also on the arrangement of the windings.
  • the inductance of the transformer is directly proportional to the permeability of the core material.
  • a comparatively large magnetic core cross section or high numbers of turns are required.
  • a larger magnetic core cross section means an enlargement of the magnetic core and thus an increase in the volume of the transformer.
  • components that are as small as possible are desirable.
  • a higher number of turns initially means an increase in the coupling capacity and thus a deterioration in the transmission behavior. To avoid this, complicated winding arrangements with insulating layers between the windings are required. This makes the winding complicated and costly.
  • the object of the invention is to provide a magnetic core for an S0 interface transmitter which has the smallest possible construction volume and which, with a simple winding structure and a low number of turns, allows the production of an S0 interface transmitter according to the ISDN requirements.
  • the ISDN requirements should in particular also be met when the transformer is DC-magnetized.
  • the interface transformers also meet the requirements of the standards with a simple winding structure requirements.
  • the transmitters achieve the required values for the inductance even with a bias, as is to be expected due to an asymmetrical current distribution in the ISDN network.
  • the permeability already decreases sharply with a low bias, so that the required inductance can only be achieved with a comparatively large magnetic core cross section or high number of turns. If the permeability ⁇ ⁇ 20,000, the required inductance is also achieved only by the measures mentioned.
  • Fine crystalline Fe-based alloys and processes for their production are known from EP-OS 271 657. These are in particular alloys which, in addition to iron, contain essentially 0.1 to 3 atom% of copper, 0.1 to 30 atom% of further metals such as Nb, W, Ta, Zr, Hf, Ti or Mo contain up to 30 atomic percent silicon and up to 25 atomic percent boron, the total content of silicon and boron being in the range between 5 and 30 atomic percent. Because of their good magnetic properties at high frequencies, these alloys are proposed for high-frequency transformers, chokes and magnetic heads. From EP-OS 299 498 magnetic cores made of a fine crystalline iron base alloy are also known, which largely retain their good magnetic properties even at elevated application temperatures. The fields of application mentioned are essentially the same as those already mentioned in EP-OS 271 657.
  • fine-crystalline iron-based alloys with an initial permeability of more than 20,000 and less than 50,000 have only a very slight decrease in permeability when a DC field is present. These alloys are therefore extremely suitable for use as a magnetic core material in interface transformers, which have an inductance L of more than 20 mH, measured at 10 kHz coupling capacity should be as low as possible.
  • the iron content of the suitable alloys is more than 60 atomic%.
  • the alloys have a structure which consists of more than 50% of fine crystalline grains with a grain size of less than 100 nm, preferably less than 25 nm.
  • the materials must have a flat hysteresis loop with a remanence ratio less than 0.2.
  • U K 0 - interface transmitter 4 are used to transmit the information between the digital switching center 1 and the network termination 2 .
  • the processing of the digital signals in the network termination 2 is carried out by electronic components 5.
  • the network termination also contains the NT interface transmitters 6 of the S0 interface.
  • the transmission of the digital signals between the network termination 2 and a terminal 3 takes place via the transmission lines 7, 8 and the receiving lines 9, 10.
  • the signals are converted via the TE interface transmitter 11 and further processing with electronic components 12.
  • the terminal also contains current-compensated radio interference suppression chokes 13.
  • the magnetic cores according to the invention are used in the NT interface transformer 6 and the TE interface transformer 11 of the S0 interface.
  • the terminal devices are partially supplied with power by the digital switching center via the S0 subscriber interface. This is the case, for example, if the terminal is a telephone.
  • the remote supply of the terminals is not shown in FIG. 1. It takes place via the center tap 14 of the NT interface transmitter 6.
  • the feed current is divided equally between the transmission lines 7, 8 and the reception lines 9, 10.
  • the different current paths will have different resistances. Possible causes for this are, for example, different winding resistances of the transmitters and different resistances of the plug contacts of the lines or the connecting cord of a terminal.
  • the transformer In order to ensure the transmission of a digital pulse within the specified pulse mask as required in the standard, the transformer must also have the specified values magnetizing currents have an inductance of more than 20 mH. Furthermore, the coupling capacity should be low. The upper limit for this is about 100 pF.
  • the magnetic core materials mentioned in the following examples were produced in the form of thin strips by the method known from EP-OS 271 657. Toroidal cores were then wound out of the tapes. The toroidal cores were then subjected to a heat treatment in the transverse field, ie in a magnetic field parallel to the rotational symmetry axis of the toroidal cores. This resulted in flat hysteresis loops with a remanence ratio B r / B s of less than 0.2, B r indicating the remanent induction and B s the saturation induction. For comparison, toroidal cores were also heat-treated in a longitudinal field or without a magnetic field.
  • a magnetic core containing 73.5 atomic% iron, 1 atomic% copper, 3 atomic% niobium, 13.5 atomic% silicon and 9 atomic% boron was subjected to heat treatments of 1 h, 540 in a transverse field ° C and 3 h, 280 ° C, subjected.
  • This magnetic core had an initial permeability of 23,000. 2 shows the dependence of the normalized permeability (permeability with premagnetization divided by permeability without premagnetization) as a function of the premagnetization. There is a slight dependence of the permeability and thus also the inductance on the premagnetization (curve A).
  • This magnetic core is ideally suited for use in an interface transformer that is subjected to a direct current bias. Even with a direct current preload of 12 mA, the inductance is still 33 mH.
  • Magnetic materials with the same composition as in example a) were subjected to a heat treatment in the transverse field of 1 h, 540 ° C. with subsequent cooling of 10 K / min in this field.
  • the toroidal cores made from it had an initial permeability of 31,000.
  • the dependence of the permeability on the premagnetization is in turn plotted in FIG. 2 (curve B).
  • These magnetic cores also showed only a very low dependency of the permeability on the premagnetization.
  • Finished transformers with a total number of turns of 2 N 40 had inductance values clearly above the required minimum value (FIG. 3, curve B).
  • Magnetic core materials with the same composition as in examples a) and b) were subjected to a heat treatment in the transverse field of 1 h, 540 ° C. with subsequent cooling in air.
  • This heat treatment achieved a somewhat higher initial permeability value of around 35,000.
  • curve C the permeability falls with increasing premagnetization in this Fall off a little more.
  • curve C for transformers with a total number of turns 2 N 38.
  • Magnetic core materials of the same composition as in Example d) were subjected to a heat treatment as in Example b).
  • magnetic core materials of the same composition as in Examples a) to c) were subjected to a heat treatment without a magnetic field for 1 h at 540 ° C with subsequent air cooling (Example g)) and a heat treatment in a longitudinal field of 1 h, 540 ° C with a then subjected to a cooling rate of 1 K / min (example h).
  • the core heat-treated without a magnetic field had an initial permeability of 58,000 and the core treated in the longitudinal field had an initial permeability of 6,000.
  • FIG. 2 curves G and H
  • these comparison cores showed a very strong decrease in the permeability in the case of a DC bias.
  • the magnetic cores according to the invention can be used to produce very compact transmitters which meet the ISDN requirements.
  • they can also be used for the NT interface transformers 6, in which a bias current of up to approximately 12 mA is expected.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Soft Magnetic Materials (AREA)
  • Coils Or Transformers For Communication (AREA)
EP90104796A 1989-04-08 1990-03-14 Application d'un alliage à base de fer, à cristallinité fine comme noyau magnétique pour un transformateur d'interface Revoked EP0392202B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3911618 1989-04-08
DE3911618A DE3911618A1 (de) 1989-04-08 1989-04-08 Verwendung einer feinkristallinen eisen-basis-legierung als magnetkernmaterial fuer einen schnittstellen-uebertrager

Publications (3)

Publication Number Publication Date
EP0392202A2 true EP0392202A2 (fr) 1990-10-17
EP0392202A3 EP0392202A3 (fr) 1991-04-03
EP0392202B1 EP0392202B1 (fr) 1996-06-12

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ID=6378289

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90104796A Revoked EP0392202B1 (fr) 1989-04-08 1990-03-14 Application d'un alliage à base de fer, à cristallinité fine comme noyau magnétique pour un transformateur d'interface

Country Status (4)

Country Link
US (1) US5074932A (fr)
EP (1) EP0392202B1 (fr)
JP (1) JPH0828290B2 (fr)
DE (2) DE3911618A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0637038A2 (fr) * 1993-07-30 1995-02-01 Hitachi Metals, Ltd. Noyau magnétique pour transformateur d'impulsions et transformateur d'impulsions de sela
EP0794541A1 (fr) * 1996-03-07 1997-09-10 Alps Electric Co., Ltd. Noyau magnétique pour transformateur d'impulsions

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19926699C2 (de) 1999-06-11 2003-10-30 Vacuumschmelze Gmbh Hochpaßzweig einer Frequenzweiche für ADSL-Systeme
DE102004024337A1 (de) * 2004-05-17 2005-12-22 Vacuumschmelze Gmbh & Co. Kg Verfahren zur Herstellung nanokristalliner Stromwandlerkerne, nach diesem Verfahren hergestellte Magnetkerne sowie Stromwandler mit denselben

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0299498A1 (fr) * 1987-07-14 1989-01-18 Hitachi Metals, Ltd. Noyau magnétique et procédé pour sa fabrication

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57193005A (en) * 1981-05-23 1982-11-27 Tdk Corp Amorphous magnetic alloy thin belt for choke coil and magnetic core for the same
JPS62179704A (ja) * 1986-02-04 1987-08-06 Hitachi Metals Ltd 制御磁化特性に優れたＦｅ基アモルフアス磁心
US4881989A (en) * 1986-12-15 1989-11-21 Hitachi Metals, Ltd. Fe-base soft magnetic alloy and method of producing same

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0299498A1 (fr) * 1987-07-14 1989-01-18 Hitachi Metals, Ltd. Noyau magnétique et procédé pour sa fabrication

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0637038A2 (fr) * 1993-07-30 1995-02-01 Hitachi Metals, Ltd. Noyau magnétique pour transformateur d'impulsions et transformateur d'impulsions de sela
EP0637038A3 (fr) * 1993-07-30 1995-03-29 Hitachi Metals Ltd Noyau magnétique pour transformateur d'impulsions et transformateur d'impulsions de sela.
US5725686A (en) * 1993-07-30 1998-03-10 Hitachi Metals, Ltd. Magnetic core for pulse transformer and pulse transformer made thereof
EP0794541A1 (fr) * 1996-03-07 1997-09-10 Alps Electric Co., Ltd. Noyau magnétique pour transformateur d'impulsions
KR100222442B1 (ko) * 1996-03-07 1999-10-01 가타오카 마사타카 펄스트랜스 자심

Also Published As

Publication number Publication date
EP0392202B1 (fr) 1996-06-12
EP0392202A3 (fr) 1991-04-03
DE59010366D1 (de) 1996-07-18
JPH0828290B2 (ja) 1996-03-21
JPH02295101A (ja) 1990-12-06
DE3911618A1 (de) 1990-10-18
US5074932A (en) 1991-12-24

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