WO2005071884A1 - Dispositif d'alimentation en courant electronique sans transformateur pour lignes de signal d'un reseau local - Google Patents

Dispositif d'alimentation en courant electronique sans transformateur pour lignes de signal d'un reseau local Download PDF

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Publication number
WO2005071884A1
WO2005071884A1 PCT/DE2005/000118 DE2005000118W WO2005071884A1 WO 2005071884 A1 WO2005071884 A1 WO 2005071884A1 DE 2005000118 W DE2005000118 W DE 2005000118W WO 2005071884 A1 WO2005071884 A1 WO 2005071884A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal lines
arrangement according
supply voltage
arrangement
amplifier means
Prior art date
Application number
PCT/DE2005/000118
Other languages
German (de)
English (en)
Inventor
Hans-Jürgen Neuhaus
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2005071884A1 publication Critical patent/WO2005071884A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/10—Current supply arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/001—Current supply source at the exchanger providing current to substations
    • H04M19/005—Feeding arrangements without the use of line transformers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0272—Arrangements for coupling to multiple lines, e.g. for differential transmission
    • H04L25/0276—Arrangements for coupling common mode signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1308—Power supply
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13082—Power supply via phantom line

Definitions

  • the invention relates to an arrangement for feeding current into the signal lines of a local network.
  • LAN local area networks
  • 4-wire lines twisted pairs
  • the end devices are usually fed via additional wires.
  • a computer workstation networked via a LAN can be supplemented by an IP telephone fed from the LAN without modifying the existing 8-wire standard cabling (twisted pair).
  • So-called phantom supply circuits are generally used for the supply via the data lines.
  • the phantom power is supplied in a 4-wire LAN with the arrangement shown in FIG. 1. 1 shows on the left side the supply voltage coupling for a terminal PD to be supplied via a supply device PSE and on the right side the supply voltage coupling on the terminal.
  • the receiving side is labeled Rx and the sending side is labeled Tx.
  • a transmitter Ü1, Ü2 and Ü3, Ü4 are provided on the coupling and decoupling sides.
  • the power supply device PSE is connected to the secondary sides of the in each case via corresponding taps Transmitter T1 and T2 connected, and ohmic resistors R1 and R2 are connected in parallel to the secondary side.
  • transformers In phantom circuits, transformers are used which have a relatively large space requirement - in particular a large overall height - and high costs in comparison to other standard electronic components.
  • This capacitive coupling and decoupling of the useful signals has the disadvantage that only transmitters with a translation ratio (g) of 1: 1 can be replaced in a simple manner.
  • transmitters with a transmission ratio of ü> l are often used.
  • Transmission ratios in the transmission direction of 1: 2 or 1: 1.41 or similar are common.
  • the transmission ratio is 1: 1 throughout in the receiving direction.
  • transmission driver modules can be used which provide lower output amplitudes of the transmission signal than are required as standard on the transmission line interface. This in turn makes it possible to operate the transmit driver modules at lower supply voltages than would be required to provide the standard output amplitude on the transmit interface. The tendency to reduce the operating voltage continues to increase.
  • the invention is therefore based on the object of specifying an improved arrangement for supplying current to terminals in a local network via the data lines, which is characterized in particular by small size and low costs and an adjustable transmission ratio.
  • the gain can be adjusted by the dimensioning and can thus be adapted to the output amplitude of the send driver module.
  • the required amplification of the transmission signal can also be realized by discrete or integrated amplifiers.
  • the high demands on such an amplifier are achieved today by the provision of video amplifiers which are inexpensive in large quantities.
  • the aim of the invention is to achieve the greatest possible cost savings by replacing the transformer. This can be achieved through the use of inexpensive standard components.
  • the receive lines (Rx) are not affected by these measures, since these transmitters are used with a transmission ratio of 1: 1. Solutions with direct capacitive signal coupling can therefore be used to replace the transmitter in the receiving lines.
  • the supply voltage or current can then be fed in by resistance supply or by electronic feed-in be done.
  • the reception path is therefore considered below only to the extent that it contributes to the overall understanding of the circuit arrangement.
  • Fig. 1 shows a conventional arrangement for supplying voltage with transformers
  • Fig. 2 shows a circuit arrangement according to an embodiment of the invention for transformerless current feed with transmit signal amplification.
  • FIG 2 shows the entire feeding source side of an arrangement according to the invention.
  • the receiving part Rx with the two electronic feed chokes Tl, T2 is shown for the sake of completeness and for better understanding.
  • the focus is on the lower part of the circuit with transistors T3 and T. A more precise description of the resistors in the resistor networks on the receiver side is therefore not given in the upper circuit section.
  • the function of the part of the circuit arrangement which is more important here will be explained using the example of the transistor circuit T3.
  • the transistor circuit T4 is required for the symmetrical feeding of the transmission signals. This behaves just like T3.
  • the function of the transistor circuit T3 is basically divided into a direct current and an alternating current function.
  • the circuit arrangement T3 represents a direct current sink for the current of the supply voltage source Usp fed into the Rx side.
  • the direct current load is the terminal connected to the LAN line.
  • the voltage drop at the DC current sink T3 is set by a voltage divider R1, R2 - with the U BE _ voltage of the transistor T3 as a reference.
  • the emitter resistor RE of the transistor T3 provides a DC negative feedback which counteracts the temperature drift of the transistor.
  • RE may only be selected so large that the voltage drop at maximum load current does not limit the required modulation capability of the transmission current source.
  • a capacitor CE prevents AC negative feedback through the resistor RE.
  • a terminal connected to the lines acts as a collector resistor at T3.
  • the resistor Z / 2 - usually 50 ⁇ - is connected between VDD (e.g. 5V) and collector of T3. This resistance represents the
  • a voltage can be detected at the emitter resistor RE, which is a measure of the load current ILoad.
  • the circuit arrangement T3 represents a single-ended A amplifier with negative voltage feedback.
  • the resistors Rl, R2, and R3 - the resistance values must be in the order of r BE of the transistor T3 - a required amplification (or damping) fung).
  • the amplitude of the transmission signal at the transmission interface of the LAN can be set to the value required by standard without any problems.
  • the internal transmission resistance of the circuit arrangement is essentially determined by the collector resistance Z / 2.
  • the entire circuit arrangement (T3) converts the usual voltage-controlling push-pull transmission stage (Tx driver) into a current-controlling transmission stage (A amplifier). This alone leads to a gain in the amplitude of the transmission signal, since the voltage drop across the series internal transmission resistance (100 ⁇ ) of the usual push-pull transmission output stage is eliminated.
  • the internal transmission resistance is parallel to the transmission current source (T3).
  • the operating voltage VDD for the terminating resistor Z / 2 can be switched off using a switch (not shown) if the load current of the terminal device exceeds the 30 mA used in the example.
  • the capacitor C21 is used to decouple the DC mean value of the transmission stage (Tx driver) from the DC operating point of the circuit arrangement T3. In individual cases, this decoupling can be superfluous. In the case of a galvanic coupling, the resistor R2 can then be omitted.
  • the implementation of the invention is not limited to this exemplary embodiment, but is also possible in a large number of modifications which are within the scope of professional action. Such modifications are possible in particular with regard to the type of transistors used and also the principle of voltage coupling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Dc Digital Transmission (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Logic Circuits (AREA)

Abstract

La présente invention concerne un dispositif d'alimentation en courant pour les lignes de signal (L1 à L4) d'un réseau local conçu pour alimenter en courant un terminal (PD). Ce dispositif comprend des systèmes amplificateurs côté émission (Tx) permettant une injection de tension d'alimentation avec un rapport de transfert différent de 1:1.
PCT/DE2005/000118 2004-01-26 2005-01-21 Dispositif d'alimentation en courant electronique sans transformateur pour lignes de signal d'un reseau local WO2005071884A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410004487 DE102004004487A1 (de) 2004-01-26 2004-01-26 Anordnung zur übertragerlosen elektronischen Stromeinspeisung in die Signalleitungen eines lokalen Netzes
DE102004004487.2 2004-01-26

Publications (1)

Publication Number Publication Date
WO2005071884A1 true WO2005071884A1 (fr) 2005-08-04

Family

ID=34801199

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2005/000118 WO2005071884A1 (fr) 2004-01-26 2005-01-21 Dispositif d'alimentation en courant electronique sans transformateur pour lignes de signal d'un reseau local

Country Status (2)

Country Link
DE (1) DE102004004487A1 (fr)
WO (1) WO2005071884A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019215409B4 (de) * 2019-10-08 2022-10-06 Festo Se & Co. Kg Feldgerät-Koppeleinrichtung und Feldgerät

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2518070A1 (de) * 1974-05-07 1975-11-20 Jeumont Schneider System zur speisung einer fernsprechleitung mit gleichstrom
EP0590242A1 (fr) * 1992-10-02 1994-04-06 DeTeWe - Deutsche Telephonwerke Aktiengesellschaft & Co. Agencement de circuit pour alimenter des terminaux numérique avec circuits de simulation d'inductance
DE4326238A1 (de) * 1993-07-31 1995-02-02 Deutsche Telephonwerk Kabel Schaltungsanordnung für eine übertragerlose physikalische Schnittstelle
DE19709710C1 (de) * 1997-03-10 1998-10-01 Siemens Ag So-Schnittstelle für einen ISDN-Basisanschluß
WO1998054843A1 (fr) * 1997-05-29 1998-12-03 3Com Corporation Systeme de transfert de puissance servant a transmettre simultanement des donnees et de la puissance a travers des lignes de transmission de donnees
DE19733250A1 (de) * 1997-08-01 1999-02-04 Deutsche Telephonwerk Kabel Schaltungsanordnung für eine Netzabschlußeinheit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9218994U1 (de) * 1992-10-02 1996-10-10 Deutsche Telephonwerk Kabel Schaltungsanordnung für die Speisung von digitalen Einrichtungen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2518070A1 (de) * 1974-05-07 1975-11-20 Jeumont Schneider System zur speisung einer fernsprechleitung mit gleichstrom
EP0590242A1 (fr) * 1992-10-02 1994-04-06 DeTeWe - Deutsche Telephonwerke Aktiengesellschaft & Co. Agencement de circuit pour alimenter des terminaux numérique avec circuits de simulation d'inductance
DE4326238A1 (de) * 1993-07-31 1995-02-02 Deutsche Telephonwerk Kabel Schaltungsanordnung für eine übertragerlose physikalische Schnittstelle
DE19709710C1 (de) * 1997-03-10 1998-10-01 Siemens Ag So-Schnittstelle für einen ISDN-Basisanschluß
WO1998054843A1 (fr) * 1997-05-29 1998-12-03 3Com Corporation Systeme de transfert de puissance servant a transmettre simultanement des donnees et de la puissance a travers des lignes de transmission de donnees
DE19733250A1 (de) * 1997-08-01 1999-02-04 Deutsche Telephonwerk Kabel Schaltungsanordnung für eine Netzabschlußeinheit

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DE102004004487A1 (de) 2005-08-18

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