EP0007526A1 - Transformateur d'entrée - Google Patents

Transformateur d'entrée Download PDF

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Publication number
EP0007526A1
EP0007526A1 EP79102397A EP79102397A EP0007526A1 EP 0007526 A1 EP0007526 A1 EP 0007526A1 EP 79102397 A EP79102397 A EP 79102397A EP 79102397 A EP79102397 A EP 79102397A EP 0007526 A1 EP0007526 A1 EP 0007526A1
Authority
EP
European Patent Office
Prior art keywords
input
input transformer
transformer according
reference potential
transformer
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
EP79102397A
Other languages
German (de)
English (en)
Other versions
EP0007526B1 (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 transmitter according to the preamble of claim 1.
  • Broadband electrical signals for example television signals, can be transmitted in their original frequency position - ie with a relative bandwidth of up to 1: 10 7 - via longer, symmetrical or asymmetrical lines.
  • the useful signal is picked up and processed by a reception amplifier at the end of a transmission line as a transverse voltage between the two wires of a symmetrical line or between the inner and outer conductor of an asymmetrical line.
  • 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.
  • Difference 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 transformers cannot be adjusted.
  • the longitudinal voltage suppression is reduced by the capacitive coupling of the primary and secondary windings.
  • the transmission bandwidth of a transmitter can be significantly increased if the transmitter is operated in short-circuit at least on the output side, that is to say is connected as a current transformer. This can be achieved by suitable design of a subsequent amplifier. It is also known to reduce the capacitive coupling of the primary and secondary windings by means of a static screen which is arranged between the primary and secondary windings and is connected to the reference potential of the input amplifier.
  • 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 transmitter works as a current transformer.
  • the invention has for its object to provide an input transmitter with the aid of which the symmetry can be set within certain limits in order to achieve optimum interference suppression at least at relatively high frequencies.
  • a transmitter 10 If a transmitter 10 is connected to a line 11, it 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 transmitter 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 few turns of a coaxially 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 is however 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 sturgeon 1 - U sturgeon 2) causes the the useful current I is superimposed on a useful noise current I stör '.
  • a coupling capacity 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 suppression of 66 dB could be achieved at 5 MHz.

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)
  • Transformers For Measuring Instruments (AREA)
  • Amplifiers (AREA)
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
DE2830957 1978-07-14
DE2830957A DE2830957C2 (de) 1978-07-14 1978-07-14 Eingangsübertrager

Publications (2)

Publication Number Publication Date
EP0007526A1 true EP0007526A1 (fr) 1980-02-06
EP0007526B1 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
DE3471195D1 (en) * 1983-11-07 1988-06-16 Radiotech Ind Commerc Sa Voltage control device for cathode-ray tube electrodes
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

Citations (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

Patent Citations (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
ATE21T1 (de) 1981-03-15
DE2960172D1 (de) 1981-04-02
DE2830957C2 (de) 1982-11-04
DE2830957A1 (de) 1980-01-24
EP0007526B1 (fr) 1981-02-25

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