EP0007526A1 - Transformateur d'entrée - Google Patents
Transformateur d'entrée Download PDFInfo
- 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
Links
Images
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)
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 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)
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)
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 |
-
1978
- 1978-07-14 DE DE2830957A patent/DE2830957C2/de not_active Expired
-
1979
- 1979-07-12 EP EP79102397A patent/EP0007526B1/fr not_active Expired
- 1979-07-12 AT AT79102397T patent/ATE21T1/de not_active IP Right Cessation
- 1979-07-12 DE DE7979102397T patent/DE2960172D1/de not_active Expired
Patent Citations (2)
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 |
DE2830957C2 (de) | 1982-11-04 |
DE2960172D1 (de) | 1981-04-02 |
EP0007526B1 (fr) | 1981-02-25 |
DE2830957A1 (de) | 1980-01-24 |
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