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EP0464569A1 - Symmetrischer Transformator für Übertragungseinrichtung - Google Patents

Symmetrischer Transformator für Übertragungseinrichtung Download PDF

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Publication number
EP0464569A1
EP0464569A1 EP19910110395 EP91110395A EP0464569A1 EP 0464569 A1 EP0464569 A1 EP 0464569A1 EP 19910110395 EP19910110395 EP 19910110395 EP 91110395 A EP91110395 A EP 91110395A EP 0464569 A1 EP0464569 A1 EP 0464569A1
Authority
EP
European Patent Office
Prior art keywords
primary
windings
winding
transformer
screen
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Withdrawn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
EP19910110395
Other languages
English (en)
French (fr)
Inventor
Dany C/O Alcatel Business Systems Jenneve
Hubert Rinie
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.)
ALE International SAS
Original Assignee
Alcatel Business Systemes SA
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 Alcatel Business Systemes SA filed Critical Alcatel Business Systemes SA
Publication of EP0464569A1 publication Critical patent/EP0464569A1/de
Withdrawn legal-status Critical Current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
    • H01F19/00—Fixed transformers or mutual inductances of the signal type
    • H01F19/04—Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range
    • H01F19/08—Transformers having magnetic bias, e.g. for handling pulses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens

Definitions

  • the invention relates to a symmetrical transformer for transmission equipment, in particular for a standard S-type interface of a digital network with service integration.
  • transformers which are used for the transmission of impulse data signals via pairs of wires between two telecommunications equipment, are required to comply with relatively severe, standardized constraints, such as those established by standard 1.430 of the International Circuit and Telephone Consultative Committee (CCITT).
  • CITT International Circuit and Telephone Consultative Committee
  • Such standards define in particular the minimum permissible galvanic isolation, as well as impedance, pulse and symmetry templates with respect to the earth.
  • the present invention therefore provides a symmetrical transformer for transmission equipment which does not require the addition of additional corrective components to ensure the transmission of digital data in pulse differential form in cooperation with a link constituted by a pair of wires and which has a significant galvanic isolation, despite its small volume.
  • This symmetrical transformer conventionally consists of a magnetic carcass, a mid-point primary intended to be connected to two wires of a transmission link by its ends, a secondary also intended to be connected to two wires d 'a second transmission link by its ends, as well as an electromagnetic screen interposed between primary and secondary and galvanically isolated from this primary and this secondary.
  • the primary of the transformer is divided, equally, in two concentric windings, interconnected, between which the secondary is sandwiched and in that the electromagnetic screen is split into two elements respectively inserted each between one of the concentric windings of the primary and the secondary with which these two elements are coaxially wound.
  • the transformer for transmission equipment presented in FIG. 1 is conventionally made up of a magnetic carcass not shown, of a primary 1 with a mid-point PM intended to be connected to two wires of a transmission link by its ends P1 and P2 , a secondary also intended to be connected to two wires of a second transmission link by its ends S1 and S2, as well as an electromagnetic screen 3 interposed between primary 1 and secondary 2 .
  • Such a transformer is conventionally used for the transmission of signals of at least roughly alternative type, it is ill-suited to the transmission of high-speed pulse signals such as those capable of being transmitted by an interface S of a digital network with service integration. , for the reasons mentioned above.
  • the primary 1 of the transformer according to the invention has two windings 10 and 11, almost identical and physically distinct, it is possibly the same for secondary 2 which then consists of one or from here two theoretically identical windings 20 and 21, the assembly is arranged so as to have the most perfect symmetry possible, both from the point of view of stray capacitances and resistances.
  • the positioning of the secondary between the two windings 10 and 11 of the primary makes it possible to obtain a low leakage self.
  • the numbers of turns of the layers of each winding are chosen to correspond to whole numbers of layers.
  • Balancing between the resistances of the windings 10 and 11 of the primary is obtained by modifying the diameter of the wires making up these windings, the wire of the winding 11, wound more outwardly relative to the core 4, being chosen larger than that of the winding 10 which it surrounds, in order to compensate for the differences in length.
  • the winding 10 has 32 turns of a wire with a diameter of 0.14 mm while the winding 11, inside which it is located, has 32 turns of 0.18 mm, l one and the other being externally covered with an insulating layer 50, for example a layer of insulating tape, such as 50 for the winding 10 and 51 for the winding 11.
  • an insulating layer 50 for example a layer of insulating tape, such as 50 for the winding 10 and 51 for the winding 11.
  • the parasitic capacity between the screen and the primary is favored compared to the capacity between this screen and the secondary.
  • the parasitic capacity of the secondary 2 must be limited to the maximum all the more since this secondary must most often be produced in two concentric windings 20 and 21 given the number of turns and the minimum desired winding height.
  • An insulating layer 53 is therefore provided to minimize the parasitic capacitance between the secondary windings 20 and 21.
  • the screen 3 is made of two interconnected elements 30 and 31 which are individually inserted each between one of the primary windings 10, 11 and one of the secondary windings 20, 21.
  • the screen element 30 consists of a conductive layer for example of copper which is externally wound on the insulating layer 50, the latter itself covers the internal primary winding 10.
  • An insulating layer 52 is in turn wound externally on the screen element 30, it is here constituted with the same insulating tape material as the layer 50, but under a double thickness.
  • An insulating layer 53 identical to the layer 52 is wound on the secondary winding 20 to separate it from the winding 21 inside the assembly wound inside the carcass, not shown, of the transformer of which they are a part, it being understood that these secondary windings are electrically connected, here inside the wound assembly.
  • Two insulating layers 54 and 55 are wound on either side of the second screen element 31, they are respectively of the same nature and of the same thickness as the insulating layers 52 and 50 to which they correspond respectively.
  • the external secondary winding 21 is therefore separated from the screen element 31 by a thickness of insulation twice that which separates the latter from the secondary winding 11 on which both are wound the first named on the second named.
  • the thickness of the insulating layer 53 between the secondary windings 20 and 21 is chosen to be equal to that of the layers 54 and 52 consequently reducing the capacity between these windings and the capacity seen from the corresponding primary.
  • the parasitic capacity of the secondary of the transformer is therefore reduced and the primary is therefore less sensitive to the influence of this secondary and more sensitive to the effects of screens 30 and 31, which facilitates its balancing with respect to earth.
  • a significant dielectric strength, for example greater than 1.5 kV rms, between primary and secondary is simultaneously capable of being obtained, it is here reinforced at the end terminals of the windings P1, P2, S1, S2 which are conventionally assembled at very short distance, by covering the pins constituting these terminals by a drop of hardening material of high dielectric strength.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP19910110395 1990-06-29 1991-06-24 Symmetrischer Transformator für Übertragungseinrichtung Withdrawn EP0464569A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9008259 1990-06-29
FR9008259A FR2664088A1 (fr) 1990-06-29 1990-06-29 Transformateur symetrique pour equipement de transmission.

Publications (1)

Publication Number Publication Date
EP0464569A1 true EP0464569A1 (de) 1992-01-08

Family

ID=9398179

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910110395 Withdrawn EP0464569A1 (de) 1990-06-29 1991-06-24 Symmetrischer Transformator für Übertragungseinrichtung

Country Status (2)

Country Link
EP (1) EP0464569A1 (de)
FR (1) FR2664088A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0690625A1 (de) * 1994-06-29 1996-01-03 AT&T Corp. Schaltung zur Übertragung von Breitband-Video über ungeschirmte verdrillte Kabelpaare
FR2732529A1 (fr) * 1995-03-27 1996-10-04 Reltek Communications Systeme de transmission de signaux a multiplexage frequentiel sur une paire de conducteurs torsades
FR3002385A1 (fr) * 2013-02-20 2014-08-22 Jacques Louis Marie Pontois Sommateur/diviseur de puissance differentiel pour radiofrequences

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2128604A1 (de) * 1971-03-04 1972-10-20 Siemens Ag
US4518941A (en) * 1983-11-16 1985-05-21 Nihon Kohden Corporation Pulse transformer for switching power supplies
DE3533649A1 (de) * 1985-09-20 1987-04-02 Siemens Ag Uebertrager

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2128604A1 (de) * 1971-03-04 1972-10-20 Siemens Ag
US4518941A (en) * 1983-11-16 1985-05-21 Nihon Kohden Corporation Pulse transformer for switching power supplies
DE3533649A1 (de) * 1985-09-20 1987-04-02 Siemens Ag Uebertrager

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0690625A1 (de) * 1994-06-29 1996-01-03 AT&T Corp. Schaltung zur Übertragung von Breitband-Video über ungeschirmte verdrillte Kabelpaare
FR2732529A1 (fr) * 1995-03-27 1996-10-04 Reltek Communications Systeme de transmission de signaux a multiplexage frequentiel sur une paire de conducteurs torsades
FR3002385A1 (fr) * 2013-02-20 2014-08-22 Jacques Louis Marie Pontois Sommateur/diviseur de puissance differentiel pour radiofrequences

Also Published As

Publication number Publication date
FR2664088A1 (fr) 1992-01-03

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Inventor name: JENNEVE, DANY C/O ALCATEL BUSINESS SYSTEMS

Inventor name: RINIE, HUBERT

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Effective date: 19921201