EP0378823A2 - Utilisation d'un noyau magnétique dans un transformateur d'interface - Google Patents

Utilisation d'un noyau magnétique dans un transformateur d'interface Download PDF

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Publication number
EP0378823A2
EP0378823A2 EP89123354A EP89123354A EP0378823A2 EP 0378823 A2 EP0378823 A2 EP 0378823A2 EP 89123354 A EP89123354 A EP 89123354A EP 89123354 A EP89123354 A EP 89123354A EP 0378823 A2 EP0378823 A2 EP 0378823A2
Authority
EP
European Patent Office
Prior art keywords
interface
magnetic core
transformers
isdn
atom
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
EP89123354A
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German (de)
English (en)
Other versions
EP0378823A3 (fr
EP0378823B1 (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 EP0378823A2 publication Critical patent/EP0378823A2/fr
Publication of EP0378823A3 publication Critical patent/EP0378823A3/fr
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Publication of EP0378823B1 publication Critical patent/EP0378823B1/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
    • H01F1/15316—Amorphous metallic alloys, e.g. glassy metals based on Co

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 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.
  • 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 about 20 mH.
  • 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.
  • 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 construction volume of the transmitter.
  • 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.
  • Co-based alloys have very low magnetostriction values. This means that the permeability drop due to stresses in the material is very small.
  • the interface transformers With the magnetic cores according to the invention, compact interface transformers with small dimensions can be produced.
  • the interface transformers also meet with a simple winding structure the requirements specified in the standards.
  • 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 pre-magnetization, 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 ⁇ ⁇ 25,000, the required inductance is also only achieved by the measures mentioned.
  • cobalt-based alloy which, in addition to cobalt, essentially contains iron and manganese with a total proportion of 3 to 8 atom% and metalloids with a proportion of 24 to 29 atom%.
  • Amorphous cobalt-based alloys with a metalloid content in the range from 5 to about 35 atom% are known for example from EP-PS 21 101 and DE-OS 3 021 536.
  • cobalt-based alloys with a metalloid content of less than 24 atomic% or more than 29 atomic% do not meet the requirements for initial permeability. Boron, silicon, carbon and phosphorus can be used as metalloids.
  • the magnetic cores according to the invention meet the ISDN standards of the S0 interface even in the case of premagnetizations such as are expected in the transformers in the network termination.
  • the amorphous cobalt-based alloys can also contain nickel with a proportion of up to 15 atom% and one or more of the elements molybdenum, chromium or niobium with a proportion of up to 1 atom%. Magnetic cores with the highest permissible However, bias values are achieved with the cobalt-iron-manganese-metalloid alloys if the manganese content is at least 0.5 atomic%.
  • S0 interface transmitters can be manufactured with an iron cross-section of less than 0.2 cm2 for the network termination side or with an iron cross-section of less than 0.1 cm2 for the end device side.
  • U K 0 interface transmitters 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 transformers 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 processed 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 transmitter 6 and the TE interface transmitter 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 transformer 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. The reasons for this include, for example, different winding resistances of the transformers and different resistances of the plug contacts of the lines or the connecting cord of a terminal into consideration.
  • 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 have an inductance of more than 20 mH even with the specified bias currents. Furthermore, the coupling capacity should be low. The upper limit for this is about 100 pF.
  • the amorphous magnetic core materials were produced in the form of thin strips by the melt spin process. This method is well known and does not form the subject of this invention. Toroidal tape cores were then wound from the amorphous 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. For this purpose, the cores were heated to a temperature of approximately 420 ° C. and then cooled at a cooling rate of 0.1 to 3 K / min.
  • the magnetic cores according to the invention have magnetostriction values of less than 0.3 * 10 ⁇ 6. This means that the permeability drop due to stresses in the material is very small.
  • a magnetic core with the alloy composition produced. Different cooling speeds of 0.2, 0.4 and 1.0 K / min were selected. Table 1 lists the values for the saturation induction Bs, the initial permeability ⁇ , measured at a frequency of 20 kHz, and the magnetic field strength Ho, at which the permeability has dropped to 70% of the value of the initial permeability.
  • the magnetic field strength Ho together with the initial permeability, provides information about the suitability as a transmitter material in the case of a pre-magnetization. Small Ho values mean suitability only with a small bias.
  • a magnetic core is listed under No. 11.1, which has an alloy composition outside the claimed range.
  • the metalloid content in this example is 20 atom%.
  • Table II lists the magnetic values of magnetic cores made of manganese-free alloys.
  • the alloys also contain 1.5 atom% molybdenum.
  • a comparison shows that these magnetic cores have smaller Ho values than the manganese-containing magnetic cores according to Example 2.
  • the manganese-free magnetic cores with a molybdenum additive can therefore be used advantageously for TE interface transformers 11.
  • magnetic core no. 14.1 shows, however, suitable heat treatment can also achieve high Ho values such that these magnetic cores can be used in the NT interface transformer 6.
  • the pairs of values represented by stars refer to an alloy of the composition From such an application, particularly advantageous range limits for the metalloid content can be specified as a function of the content of other metal alloy components and of the initial permeability ⁇ .
  • the individual metal alloy portions of a magnetic core according to the invention are given by: 3 ⁇ a + b ⁇ 8, c ⁇ 15, d ⁇ 1, 0.3 ⁇ x ⁇ 0.7.
  • FIG. 3 shows the relationship between Ho and the initial permeability for manganese-containing and manganese-free magnetic cores according to Examples 2 and 3, respectively.
  • the illustration shows that the Ho values are increased by the addition of manganese.
  • the manganese-containing magnetic cores can achieve Ho values that are significantly higher than those of the manganese-free magnetic cores.
  • the manganese-containing alloys are therefore the preferred magnetic core materials for the claimed interface transformers.
  • the manganese-containing alloys are therefore preferred as magnetic core materials, especially for interface transformers with a high DC bias.
  • Amorphous cobalt-based alloys containing various combinations of iron, manganese, nickel and molybdenum additives were examined in a further extensive series of tests. The results are summarized in Tab. 3.
  • the initial permeability was again measured at a frequency of 20 kHz.
  • permeability values in the range from 25,000 to 95,000 can also be achieved with these magnetic cores.
  • This often requires a relatively high cooling rate in the heat treatment, which is more difficult to implement technically.
  • the elements chrome or niobium have the same effect as molybdenum.
  • Suitable magnetic cores can therefore also be produced with amorphous cobalt-based alloys which, in addition to cobalt, iron, manganese and metalloids, also contain nickel, molybdenum, chromium or niobium. However, preference is given to alloys which are free from the latter alloy elements.
  • Sufficient inductance values and low coupling capacitance values could also be achieved with magnetic cores No. 5.3, 6.3 and 7.3.
  • the magnetic cores mentioned have permeability values between 67,000 and 86,000.
  • the Ho values are in the range between 26 and 45 mA / cm.
  • Fig. 4 the dependence of the inductance on the DC bias for transformers with magnetic cores No. 3.2 and 12.1 is shown graphically. 2 x 19 turns are applied to the magnetic cores.
  • the transformer with the manganese-containing magnetic core 3.2 shows a significantly higher direct current load than the transformer with the manganese-free core No. 12.1.
  • the transformer with the manganese-containing core no. 3.2 in the specified embodiment fulfills the ISDN requirements up to a DC bias of about 5 mA. It can therefore be used in particular as a TE interface transformer 11.
  • Transformers were manufactured with the magnetic cores no. 1.2, 7.1, 9.2, 10.2, 11.1 and 27.1. The transformers in turn had two windings of the same number of turns. The dimensions of the finished component were 14 x 7 x 6 mm. The inductance L (0) without premagnetization and the Inductance with a DC bias of 12 mA and the coupling capacitance C. The measurements were carried out at a frequency of 20 kHz. The results are summarized in Tab. 5.
  • the permeability of the cores used by way of example is between 34,000 and 39,000.
  • the Ho values are in the range between 90 and 108 mA / cm. It can be seen from the comparison with the values from Example 5 that magnetic cores with a lower initial permeability and a higher Ho value must be selected for higher direct current preloads. This can also be seen from the transformers with magnetic core No. 11.1 and 27.1 also listed in Tab.
  • FIG. 5 shows the dependency of the inductance on the direct current bias for two transformers with the magnetic cores No. 9.2 and 14.1, respectively.
  • the transformer with the manganese-free core No. 14.1 fulfills the ISDN requirements for inductance up to a DC current load of around 10 mA.
  • the transmitter with the manganese-containing magnetic core No. 9.2 fulfills the ISDN requirements with regard to Inductance up to a DC bias of about 14 mA. With the specified size and number of turns, it can thus be used as an NT interface transformer 6.
  • FIG. 5 again illustrates the superiority of the magnetic cores containing manganese with a high direct current preload.
  • the magnetic cores according to the invention can thus be used to produce very compact transmitters which meet the ISDN requirements.
  • the appropriate magnetic cores for the different DC biases can easily be selected based on the examples given.
  • Tab. I No. v (K / min) Fe Mn Si B Bs (T) ⁇ i x1000 Ho (mA / cm) 1.1 0.2 4th 0 16.8 11 0.63 34 108 1.2 0.4 0.63 38 90 1.3 1.0 0.63 43 84 2.1 0.2 3.3 1 17.3 11 0.58 106 14 2.2 0.4 0.58 118 12 2.3 1.0 0.58 130 9 3.1 0.2 3.3 1 17th 11 0.60 65 43 3.2 0.4 0.60 78 34 3.3 1.0 0.60 93 22 4.1 0.2 3.5 1 16.7 11 0.60 45 73 4.2 0.4 0.60 57 53 4.3 1.0 0.60 75 32 5.1 0.2 3.4 1 16.7 11 0.61 54 57 5.2 0.4 0.61 69 43 5.3 1.0 0.61 86 26 6.1

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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)
EP89123354A 1989-01-14 1989-12-18 Utilisation d'un noyau magnétique dans un transformateur d'interface Expired - Lifetime EP0378823B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3900946A DE3900946A1 (de) 1989-01-14 1989-01-14 Magnetkern fuer einen schnittstellen-uebertrager
DE3900946 1989-01-14

Publications (3)

Publication Number Publication Date
EP0378823A2 true EP0378823A2 (fr) 1990-07-25
EP0378823A3 EP0378823A3 (fr) 1991-04-03
EP0378823B1 EP0378823B1 (fr) 1995-03-15

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EP89123354A Expired - Lifetime EP0378823B1 (fr) 1989-01-14 1989-12-18 Utilisation d'un noyau magnétique dans un transformateur d'interface

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EP (1) EP0378823B1 (fr)
JP (1) JP3229309B2 (fr)
DE (2) DE3900946A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998012847A1 (fr) * 1996-09-17 1998-03-26 Vacuumschmelze Gmbh Transformateur d'impulsions pour interfaces en u selon le principe de la compensation d'echo
WO2001027946A1 (fr) * 1999-10-11 2001-04-19 Vacuumschmelze Gmbh Modules d'interface pour reseaux de donnees locaux

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7003046B2 (ja) * 2016-09-29 2022-01-20 株式会社東芝 磁心

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5358576A (en) * 1979-06-09 1994-10-25 Matsushita Electric Industrial Co., Ltd. Amorphous materials with improved properties
DE2924280A1 (de) * 1979-06-15 1981-01-08 Vacuumschmelze Gmbh Amorphe weichmagnetische legierung
US4482400A (en) * 1980-03-25 1984-11-13 Allied Corporation Low magnetostriction amorphous metal alloys
DE3275492D1 (en) * 1982-01-18 1987-04-02 Allied Corp Near-zero magnetostrictive glassy metal alloys with high magnetic and thermal stability
JPS6024338A (ja) * 1983-07-19 1985-02-07 Hitachi Metals Ltd 非晶質強磁性合金
JPS61243152A (ja) * 1985-11-29 1986-10-29 Res Inst Iron Steel Tohoku Univ 高透磁率アモルフアス合金及びその製造法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998012847A1 (fr) * 1996-09-17 1998-03-26 Vacuumschmelze Gmbh Transformateur d'impulsions pour interfaces en u selon le principe de la compensation d'echo
US6118365A (en) * 1996-09-17 2000-09-12 Vacuumschmelze Gmbh Pulse transformer for a u-interface operating according to the echo compensation principle, and method for the manufacture of a toroidal tape core contained in a U-interface pulse transformer
WO2001027946A1 (fr) * 1999-10-11 2001-04-19 Vacuumschmelze Gmbh Modules d'interface pour reseaux de donnees locaux

Also Published As

Publication number Publication date
JPH02271504A (ja) 1990-11-06
JP3229309B2 (ja) 2001-11-19
EP0378823A3 (fr) 1991-04-03
DE58909115D1 (de) 1995-04-20
DE3900946A1 (de) 1990-07-26
EP0378823B1 (fr) 1995-03-15

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