EP0482324A1 - Transmission de données sur conducteur à glissement - Google Patents

Transmission de données sur conducteur à glissement Download PDF

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Publication number
EP0482324A1
EP0482324A1 EP91114975A EP91114975A EP0482324A1 EP 0482324 A1 EP0482324 A1 EP 0482324A1 EP 91114975 A EP91114975 A EP 91114975A EP 91114975 A EP91114975 A EP 91114975A EP 0482324 A1 EP0482324 A1 EP 0482324A1
Authority
EP
European Patent Office
Prior art keywords
contact
circuit arrangement
arrangement according
circuit
voltage
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.)
Ceased
Application number
EP91114975A
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German (de)
English (en)
Inventor
Hermann Dr. Lanfer
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.)
R Stahl Foerdertechnik GmbH
Original Assignee
R Stahl Foerdertechnik 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 R Stahl Foerdertechnik GmbH filed Critical R Stahl Foerdertechnik GmbH
Publication of EP0482324A1 publication Critical patent/EP0482324A1/fr
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R41/00—Non-rotary current collectors for maintaining contact between moving and stationary parts of an electric circuit

Definitions

  • the invention relates to a circuit arrangement for data transmission in the baseband or by means of a modulated carrier via conductor lines, according to the preamble of claim 1.
  • the contact resistance that occurs between the contact strip and the contact line as a result of contamination and oxidation has a non-linear characteristic and is the more disturbing the lower the signal voltage that is to be transmitted via the contact lines and contact strips.
  • the nonlinear resistance characteristic of the oxide layer on the conductor lines there is a lower voltage below which the oxide layer cannot be removed by the flowing electrical current.
  • the contact resistance at this point is reduced from a very high value in the range of megohms to values of mOhm.
  • Data transmission systems are also known in practice, in which the information is supplied via a network line, similar to the in-house telephones, whose carrier frequency systems communicate with one another via the mains sockets.
  • a network line similar to the in-house telephones, whose carrier frequency systems communicate with one another via the mains sockets.
  • a current can be generated via the contact line and the two contact pieces, which current eliminates the oxide skin between the contact pieces and the contact line. Since this is otherwise galvanically isolated for the conductor lines, the data signal can be fed in and taken off with low electrical power and at low voltage. It is only necessary with regard to the frequency of the data signal, the voltage sources for the individual conductor lines to largely decouple gene from each other, which results overall in a very simple circuit arrangement.
  • the decoupling is very simple if the frequency of the data signal is significantly higher than the frequency of the output voltage of each voltage source, because then no steep-sided filters are required for the separation, but simple capacitors and inductors are sufficient.
  • the voltage source itself does not need to have a high output either, because it is sufficient if it outputs a current of a few mA in the event of a short circuit and a voltage of approximately 100 V in the event of an open circuit. Such a tension is otherwise not dangerous for humans, since it collapses at the slightest load, but on the other hand is sufficient to penetrate the oxide skin.
  • the high internal resistance on the one hand and the decoupling on the other hand can be achieved in a very simple manner by using inductors which are located in the circuit between the voltage source and the contact strips.
  • inductors which are located in the circuit between the voltage source and the contact strips.
  • the use of inductors reduces the power losses because essentially only reactive power is converted in the inductor.
  • the voltage source consists of a secondary winding of a transformer, which is otherwise galvanically isolated from all other windings.
  • the data circuit is advantageously connected to the contact strips via a filter circuit, the filter circuit suppressing the frequency of the output voltage of the voltage source, i.e. prevents it from being forwarded to the input or output of the data circuit.
  • the data signal itself is advantageously a DC-free signal, namely either a DC-free baseband signal or a data signal modulated on a carrier, which is anyway DC-free due to the modulation.
  • a section 1 of a monorail overhead conveyor is illustrated in the detail, along which a vehicle 2 can travel back and forth.
  • the running rail 1 has the shape of an I-profile and consists of an upper and a lower flange 3, 4, both of which are connected to one another by a vertical web.
  • the vehicle 2 runs, as can be seen in the figure, with its wheels 6 on the upper side of the lower flange 4.
  • the vehicle is provided in the known manner with a lifting device 8, on the traction means 9 of which the load 7 is attached.
  • the vehicle 2 is moved by a drive motor (not shown in the drawing) which drives at least one of the wheels 6 so that the vehicle 2 can move along the rail 1.
  • a drive motor (not shown in the drawing) which drives at least one of the wheels 6 so that the vehicle 2 can move along the rail 1.
  • conductor lines are provided on the web 5 on the side facing away from the viewer, which conduct current constantly and bring the current to the vehicle 2.
  • a control circuit 11 In order to set the drive motor to a corresponding standstill or in motion so that the vehicle 2 stops at the correct point or continues to run, a control circuit 11 is provided which also starts or stops the lifting device 8 at the same time.
  • the data signals for the control circuit 11 are transmitted to the vehicle 2 via two conductor lines 12 and 13 which are mounted on the web 5.
  • the vehicle 2 picks up the data signals present on the conductor lines 12, 13 via contact strips 14... 17, which are shown in FIG. 2 and are movably mounted, for example, in a receptacle 18 of the vehicle 2.
  • the vehicle 2 has two contact strips 14 and 15 or 16 and 17 per contact line 12, 13. Between the contact pieces 14 and 15 and the contact pieces 16 and 17, a voltage is applied in each case.
  • the contact piece 14 is connected via a line 19 to one end of a secondary winding 21, the other end of which is connected to the contact piece 15 via an inductor 22 in the form of a choke and via a line 23 leading away therefrom.
  • the contact strip 16 is connected to another via a line 24 and a throttle 25 Secondary winding 26 connected, the other end of which lies on the contact piece 17 via a line 27.
  • the two secondary windings 21 and 26 are part of a transformer 28, the primary winding 29 of which is supplied with a mains voltage, which is brought in via the travel rail 1 in order to supply the drive motor or the hoist 8 with current when required.
  • the two secondary windings 21 and 26 which are galvanically isolated from each other and from the primary winding 29, form voltage sources, one of which is connected to a pair of contact strips 14, 15 and 16, 17, respectively.
  • the schematically indicated control circuit 11 also contains a schematic data circuit 31 with a transmission device 32 in order to process the data signals received via the lines 12, 13 and to forward them to other modules of the control circuit 11 via outputs 33.
  • An isolating transformer 35 with two electrically isolated windings 36 and 37 is connected to an input 34 of the transmission circuit, the winding 37 being connected directly to the transmission circuit 32.
  • the other winding 36 is connected to the contact strips 14 .. 17.
  • One end of winding 36 is AC connected to lines 19 and 23 via two capacitors 38, 39, i.e. the two contact strips 14 and 15, which both run on the contact line 12.
  • the other end of the winding 36 is also connected to the other two contact strips 16 and 17 in terms of alternating current via two capacitors 41 and 42.
  • These two contact strips run, as the figure shows, on the contact line 13, i.e. the data circuit 31 receives, as an input signal, the signal which is present between the conductor lines 12 and 13.
  • the rails 1 can reach considerable length, it is expedient if the two conductor lines 12 and 13 are terminated at both ends by ohmic resistors 43, the impedance of which corresponds to the characteristic impedance of the two conductor lines 12, 13 in order to excite standing waves to prevent on the conductor lines 12, 13.
  • the data signals are fed in at one end of the two conductor lines 12, 13 from a data transmitter 44, which on the output side also contains an isolating transformer 45, the secondary winding 46 of which is connected to the two conductor lines 12, 13.
  • FIG. 2 Because not only one, but several vehicles 2 are running on the running rail 1, the part of a second vehicle 2 ′ that is essential for data transmission is also shown in FIG. 2. This electrical part of the vehicle 2 'is constructed in the same way as for the vehicle 2.
  • FIG. 3 is simplified and shows an extract from FIG. 2, namely the conductor line 13 with the two contact pieces 16 and 17 running thereon and the transformer 28, including the secondary winding 26 connected to the two contact pieces 16 and 17.
  • the transformer 28 on its primary winding 29 is also supplied with the driving voltage, for example. 220 V AC voltage, applied.
  • the voltage is transformed down in the transformer 28, for example to an open circuit voltage of approximately 100 V on each of the two secondary windings 26 and 21.
  • the voltage of the secondary winding 26 is across the inductor 25 on the two contact strips 16 and 17, which are on the same contact line , namely the conductor line 13, run.
  • FIG. 4 The relationship between the no-load output voltage, which can be measured on the two contact strips 16 and 17 when they are lifted from the contact line 13, and the short-circuit current which flows when the two contact strips 16 and 17 are connected to one another with virtually no resistance, is shown in FIG. 4 shown.
  • the relationship is essentially linear if the internal resistance has an active component that is approximately equal to the reactive component. If the reactive component predominates, the curve approximates an elliptical arc as shown in broken lines in FIG. In any case, the lower the resistance between the contact strips 16 and 17, the smaller the tension between the two contact strips 16 and 17. Under certain circumstances, it may also be expedient to install a non-linear element in one of the lines 24, 27 or 19, 23 in order to achieve a faster voltage drop.
  • the comparatively high open circuit voltage now ensures that there is always good galvanic contact between the contact strip 16 and the contact line 13 on the one hand and the contact piece 17 and the contact line 13 on the other hand. If an oxide skin has formed on the conductor line 13, onto which the contact strips 16 and 17 run when the vehicle 2 is moving, As can be seen from the relationship in FIG. 4, the voltage between the two contact strips 16 and 17 automatically increases in the direction of the open circuit voltage and thereby achieves values which are large enough to break through the oxide skin between the contact line 13 and the contact strips 16, 17 , so that the contact resistance at the contact point between the conductor line 13 and the relevant contact piece 16 or 17 practically disappears.
  • the high internal resistance prevents intolerably large values in the event of a "short circuit", ie when the oxide skin and thus the contact resistance between the conductor line 13 and the two contact pieces 16, 17 has disappeared. As soon as the contact resistance has disappeared, there is no need for any current to flow at all.
  • the use of the choke 25 in connection with, for example, a transformer 28 produced with high leakage inductance allows the large internal resistance to be generated, which on top of that has practically only a reactive component, so that almost no active power is converted.
  • the contact strips 16 and 17 or the contact pieces 14 and 15 are in series, the connection being made via the contact line 13 or 12.
  • the contact strips 14... 17 running on one and the same contact line 13 or 12 are connected in parallel, since the contact pieces 36 running on a contact line have one end of the isolating transformer 36 via the capacitors 38, 39 and the other Conductor line, for example 12, running contact strips 14, 15 are connected to the other end of the isolating transformer 36 via the capacitors 41 and 42.
  • the grinding pieces 14 and 15 on the one hand and the grinding pieces 16 and 17 on the other hand are connected in parallel, i.e. the data circuit 31 is connected to a pair of contact strips 14, 15 and 16, 17, respectively.
  • the data circuit 31 thus receives as a signal the voltage that is present between the two conductor lines 12, 13.
  • the data circuit 31 consists of a receiving unit which receives data signals which are fed in at the end of the conductor line 12, 13 via the data transmission device 44, as a voltage signal between the two Contact lines 12, 13. Since the internal resistance, measured between the contact pieces 14 and 16, for example, is high - it lies in the several kOhm range - the data transmission device 44 is practically not loaded at its output and can transmit the data signals with low power.
  • the data circuit 31 is also not affected at its input 34 by the circuit fed by the transformer 28, in particular the 50 Hz signal does not lead to an input signal at the data circuit 31 or at the data transmission device 44 due to the use of the mains voltage, since this 50 Hz voltages on the contact strips 14 .. 17 are symmetrical and potential-free with respect to the data circuit 31 or the data transmission device 44.
  • the voltage present between each pair of contact strips 14, 15 or 16, 17 ensures that the contact resistance between each pair of contact pieces 14, 15 or 16, 17 and the associated contact line 12, 13 is eliminated. so that the data signals can also be transmitted with very low voltages, for example 12 V or less. Without the use of the additional voltage generated by transformer 28, the voltage of the data signals would be too low to be able to place an oxide skin between the conductor lines 12, 13 and the contact pieces 14. 17 running on them to eliminate. In this way, however, the data signals always hit a low-resistance contact point, which is eliminated with the aid of the high voltage supplied by the transformer 28.
  • circuit arrangement shown is not limited to establishing connections in simplex mode, in which the data only run towards the vehicle 2. It is also possible to use a half duplex or a To set up full duplex connection, in which case the data circuit 31 can also act as a transmitter at the same time, in order to in turn provide information to a central controller (not shown).
  • the new circuit arrangement can work both in the baseband when a DC-free binary signal is transmitted, or it can work with the aid of a carrier frequency in which the information is modulated onto an AC carrier.
  • An example of an AC-free binary signal is shown in FIG. 5.
  • the upper representation of FIG. 5 shows an exemplary binary signal to be transmitted, which oscillates back and forth between two voltage levels, depending on which of the two digital values 0 or 1 is to be transmitted. In the data circuit 31 or the transmitter 44, this signal is converted into the signal shown in FIG. 5 below, in such a way that the binary values 0 and 1 are formed by the signal edges and no longer by the signal levels.
  • a change in the voltage level from a positive to the negative value of equal magnitude means a binary 0, while the increase from the corresponding negative voltage value to the positive voltage value of equal magnitude is interpreted as binary 1. It is thereby achieved that the mean voltage value is practically always 0 and can be easily transmitted via the capacitors 38 .. 42.
  • the two secondary windings 21 and 26 are not only coupled magnetically but also capacitively to one another, it can be advantageous if the inductor 22 and 25 shown in each circuit is divided and one part in the line 23 and the other part in the Line 19 or a part in line 27 and the other in line 24. In this way, the decoupling of the two secondary windings 21 and 26 is improved from the point of view of the data signal, because capacitive coupling influences have less effect.

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  • Train Traffic Observation, Control, And Security (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
EP91114975A 1990-09-29 1991-09-05 Transmission de données sur conducteur à glissement Ceased EP0482324A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4030939 1990-09-29
DE19904030939 DE4030939A1 (de) 1990-09-29 1990-09-29 Datenuebertragung ueber schleifleiter

Publications (1)

Publication Number Publication Date
EP0482324A1 true EP0482324A1 (fr) 1992-04-29

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EP91114975A Ceased EP0482324A1 (fr) 1990-09-29 1991-09-05 Transmission de données sur conducteur à glissement

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EP (1) EP0482324A1 (fr)
DE (1) DE4030939A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104064932A (zh) * 2014-07-07 2014-09-24 镇江市江岛电器制造有限公司 一种新型滑触线

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4319347C2 (de) * 1993-06-11 1996-02-29 Ant Nachrichtentech Nachrichtenübertragungsanlage für eine Krananlage
DE9401715U1 (de) * 1994-02-02 1994-03-24 W.M. Filmtechnik GmbH, 83620 Feldkirchen-Westerham Vorrichtung zur Signalübertragung bei einem Kamerawagen
DE19730926A1 (de) * 1997-07-17 1999-01-21 Schleifring & Apparatebau Gmbh Anordnung zur galvanischen Übertragung elektrischer Signale zwischen beweglichen Teilen
EP1168691A1 (fr) * 2000-06-08 2002-01-02 Trend Network AG Méthode pour afficher des informations dans un véhicule, qui est propulsé par l'énergie électrique, où le caténaire, qui sert pour la transmission d'énergie électrique vers le véhicule, est utilisé pour la transmission de données vers le véhicule
FR3038270B1 (fr) * 2015-06-30 2017-08-25 Mersen France Amiens Sas Surveillance de l'etat d'un premier element mobile par rapport a un deuxieme element et frottant contre ce deuxieme element.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH573177A5 (en) * 1974-07-15 1976-02-27 Motor Columbus Ing Sync. machine with two brushes per slip-ring - brushes switched in parallel for excitation current and in series for auxiliary current
CH613431A5 (en) * 1976-08-19 1979-09-28 Graf Armin Sectional mounting rail with current conductors, in particular for travelling crabs

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3092739A (en) * 1959-11-13 1963-06-04 Rosemount Eng Co Ltd Dry circuit switching means

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH573177A5 (en) * 1974-07-15 1976-02-27 Motor Columbus Ing Sync. machine with two brushes per slip-ring - brushes switched in parallel for excitation current and in series for auxiliary current
CH613431A5 (en) * 1976-08-19 1979-09-28 Graf Armin Sectional mounting rail with current conductors, in particular for travelling crabs

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104064932A (zh) * 2014-07-07 2014-09-24 镇江市江岛电器制造有限公司 一种新型滑触线

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Publication number Publication date
DE4030939C2 (fr) 1993-02-18
DE4030939A1 (de) 1992-04-09

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