EP0007526B1 - Transformateur d'entrée - Google Patents

Transformateur d'entrée Download PDF

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Publication number
EP0007526B1
EP0007526B1 EP79102397A EP79102397A EP0007526B1 EP 0007526 B1 EP0007526 B1 EP 0007526B1 EP 79102397 A EP79102397 A EP 79102397A EP 79102397 A EP79102397 A EP 79102397A EP 0007526 B1 EP0007526 B1 EP 0007526B1
Authority
EP
European Patent Office
Prior art keywords
input
input transformer
transformer
transformer according
primary
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.)
Expired
Application number
EP79102397A
Other languages
German (de)
English (en)
Other versions
EP0007526A1 (fr
Inventor
Erich Beekmann
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.)
Grundig AG
Original Assignee
Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
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 Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH filed Critical Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
Priority to AT79102397T priority Critical patent/ATE21T1/de
Publication of EP0007526A1 publication Critical patent/EP0007526A1/fr
Application granted granted Critical
Publication of EP0007526B1 publication Critical patent/EP0007526B1/fr
Expired 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
    • H01F19/06—Broad-band transformers, e.g. suitable for handling frequencies well down into the audio range
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2823—Wires
    • H01F2027/2833—Wires using coaxial cable as wire

Definitions

  • the invention relates to an input transformer according to the preamble of claim 1.
  • Broadband electrical signals for example television signals
  • the useful signal is picked up and processed as a transverse voltage between the two wires of a symmetrical line or between the inner and outer conductors of an asymmetrical line by a receiving amplifier.
  • the interference voltage coupled into the transmission line by external interference sources occurs at the end of the transmission line predominantly as a longitudinal voltage and must be separated from the useful signal and suppressed, for example, by a differential amplifier or by an input transformer.
  • Differential amplifiers allow a sufficient transmission bandwidth, their symmetry can be adjusted with relatively simple means even at relatively high frequencies, but their modulation capability for longitudinal voltages is limited.
  • the maximum permissible longitudinal voltage is only limited by the insulation between the primary and secondary windings.
  • the bandwidth of normal transmitters is relatively small and hardly suitable for the transmission of television signals in their original frequency position. The symmetry of such transmitters cannot be adjusted.
  • the longitudinal voltage suppression is reduced by the capacitive coupling of the primary and secondary windings.
  • the input transformer is connected upstream of an amplifier whose input resistance is, for example, negligibly small due to a correspondingly selected current negative feedback, the input resistance of the transformer is also negligibly small.
  • the transformer works as a current transformer.
  • the invention has for its object to provide an input transformer, with the help of which the symmetry can be adjusted within certain limits in order to achieve optimum interference suppression at least at relatively high frequencies.
  • a transformer 10 is connected to a line 11, this must be terminated without reflection by a real resistor 12, 13.
  • This resistor 12, 13 is to be connected in series with the primary winding 14 of the transformer 10. If the circuit is designed so that the primary winding 14 of the transformer 10 consists of only a few turns, the necessary static screen between the primary 14 and secondary winding 15 can surround the primary conductor on all sides as a concentric screen, the primary winding 14 then consists of a few turns coaxial shielded cable.
  • the terminating resistor of the incoming line is divided into two resistors 12, 13 of the same size, which are connected upstream of the two ends of the primary winding 14.
  • the two ends of the shield 16 are led out of the transformer and connected to the ends of a relatively low-resistance potentiometer 17, the resistance of which, however, is so great that the useful signal transmission is practically not impaired.
  • the tap 18 of the potentiometer 17 is connected to the secondary reference potential, this is generally ground.
  • Different interference voltages U disturb 1 and U disturb 2 at the input terminals 19 and 20 can be caused, for example, by different earth capacitances C 1 and C 2 at these input terminals 19, 20.
  • the difference voltage (U 1 -U sturgeon sturgeon 2) causes a parasitic current I sturgeon, of the useful current I superimposed useful.
  • the interference voltages e n U disturb 1 and U disturb generate a capacitive leakage current l k .
  • This capacitive leakage current I k is divided into two partial currents I k1 and I k2 , which come out of the transmitter 10 via the two ends of the shield 16 and flow to the reference potential via the end points of the potentiometer 17 and its tap 18.
  • I k1 or I k2 predominates .
  • the shield 16 has the effect of a winding with the same number of turns as the primary winding 14.
  • a coupling capacitance of only 10 pF between the primary input connections 19, 20 and the secondary reference potential could be achieved with a useful bandwidth of approximately 1 Hz to 10 MHz.
  • interference voltages of approximately the same magnitude between the input connections 19, 20 and the reference potential interference suppression of 66 dB could be achieved at 5 MHz.
  • the symmetry of the input can be influenced, in particular for higher frequencies, if the tap of the potentiometer is connected to the reference potential.
  • Optimal interference suppression can also be achieved at the input terminals of the circuit, in particular at higher frequencies, with interference voltages of different sizes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Power Engineering (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Amplifiers (AREA)
  • Transformers For Measuring Instruments (AREA)

Claims (6)

1. Transformateur d'entrée (10) pour des signaux électriques à large bande transmis par une ligne (11) symétrique ou dissymétrique, transformateur caractérisé en ce que l'enroulement primaire (14) est constitué par une ligne coaxiale dont les deux extrémités du conducteur intérieur reçoivent le signal d'entrée, les deux extrémités du conducteur extérieur (16) étant sorties et étant connectées aux bornes d'un potentiomètre (17) dont le curseur (18) se trouve à un potentiel de référence.
2. Transformateur selon la revendication 1, caractérisé en ce que le curseur (18) du potentiomètre (17) se trouve au potentiel de référence du côté secondaire.
3. Transformateur selon la revendication 1 ou 2, caractérisé en ce que l'enroulement secondaire (15) est fermé sur un amplificateur à contre-réaction de résistance d'entrée pratiquement nulle.
4. Transformateur selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'une résistance (12, 13) est intercalée à une entrée, du côté primaire.
5. Transformateur selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'une résistance (12, 13) est intercalée dans chaque entrée, du côté primaire.
6. Transformateur selon la revendication 5, caractérisé en ce que les deux résistances (12, 13), ont des valeurs sensiblement égales.
EP79102397A 1978-07-14 1979-07-12 Transformateur d'entrée Expired EP0007526B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79102397T ATE21T1 (de) 1978-07-14 1979-07-12 Eingangsuebertrager

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2830957A DE2830957C2 (de) 1978-07-14 1978-07-14 Eingangsübertrager
DE2830957 1978-07-14

Publications (2)

Publication Number Publication Date
EP0007526A1 EP0007526A1 (fr) 1980-02-06
EP0007526B1 true EP0007526B1 (fr) 1981-02-25

Family

ID=6044366

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79102397A Expired EP0007526B1 (fr) 1978-07-14 1979-07-12 Transformateur d'entrée

Country Status (3)

Country Link
EP (1) EP0007526B1 (fr)
AT (1) ATE21T1 (fr)
DE (2) DE2830957C2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1246244A (fr) * 1983-11-07 1988-12-06 Francis Faye Dispositif pour faire varier la tension appliquee a une electrode de tube cathodique
DE3731394C2 (de) * 1987-09-18 1993-12-16 Euchner & Co Hochfrequenz-Entstörfilter für eine an eine Leitung anzuschließende Schaltung, insbesondere für Zweidraht-Sensoren
AT408952B (de) * 1996-04-01 2002-04-25 Fancyform Design Engineering Einspuriger rollschuh oder gleitschuh mit kufen
AT404559B (de) * 1996-08-09 1998-12-28 Fancyform Design Engineering Inline-skate

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE967046C (de) * 1950-12-19 1957-09-26 Telefunken Gmbh Schaltung zur Erzeugung der Gittervorspannung
US3361928A (en) * 1962-11-28 1968-01-02 Hitachi Ltd Transformers having a plurality of secondary windings and charged particle sources of double pulsing system utilizing such transformers

Also Published As

Publication number Publication date
EP0007526A1 (fr) 1980-02-06
DE2960172D1 (de) 1981-04-02
DE2830957A1 (de) 1980-01-24
DE2830957C2 (de) 1982-11-04
ATE21T1 (de) 1981-03-15

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