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DE2535698A1 - DC isolating circuit for TDM transmission system - has dial triggered by capacitor and discharging capacitor through primary winding - Google Patents

DC isolating circuit for TDM transmission system - has dial triggered by capacitor and discharging capacitor through primary winding

Info

Publication number
DE2535698A1
DE2535698A1 DE19752535698 DE2535698A DE2535698A1 DE 2535698 A1 DE2535698 A1 DE 2535698A1 DE 19752535698 DE19752535698 DE 19752535698 DE 2535698 A DE2535698 A DE 2535698A DE 2535698 A1 DE2535698 A1 DE 2535698A1
Authority
DE
Germany
Prior art keywords
capacitor
primary winding
diode
trigger diode
input
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
DE19752535698
Other languages
German (de)
Inventor
Ruediger Schneider
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.)
BBC BROWN BOVERI and CIE
BBC Brown Boveri AG Germany
Original Assignee
BBC BROWN BOVERI and CIE
Brown Boveri und Cie AG Germany
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 BBC BROWN BOVERI and CIE, Brown Boveri und Cie AG Germany filed Critical BBC BROWN BOVERI and CIE
Priority to DE19752535698 priority Critical patent/DE2535698A1/en
Priority to AT556576A priority patent/AT351111B/en
Priority to CH1006376A priority patent/CH595015A5/xx
Publication of DE2535698A1 publication Critical patent/DE2535698A1/en
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/28—Modifications for introducing a time delay before switching
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/35—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar semiconductor devices with more than two PN junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region

Landscapes

  • Dc Digital Transmission (AREA)

Abstract

The dc isolating circuit, for TDM transmission systems, avoids using an optoelectronic coupler and its associated relatively complex circuitry. The circuit includes one capacitor (1) a resistor (2) and an input trigger diode (3). The input trigger diode (3) is coupled in series with the primary winding of a transformer (4). This series combination is connected in parallel with the capacitor (1) charged over the resistor (2) from a 110V dc source. The trigger diode has bidirectional characteristics and can be eg a diac or antiparallel thyristors. The 110V applied to the input charges the capacitor. At a given point the capacitor voltage triggers the diode. The diode discharges the capacitor through the primary winding.

Description

t t'Vorrichtlmg zur potentialfreien Eingabe von Gleich-! spannungssignalen Die Erfindung bezieht sich auf eine Vorrichtung zur potentialfreien Eingabe von Gleichspannungssignalen mit eingangseitigem Scharellwerts~halter. Sie findet bei der Übertragung von digitalen Signalen Anwendung, beispielsweise bei der zeitmultiplexen Wendezugsteuerung. t t'Device for potential-free input of direct! voltage signals The invention relates to a device for floating input of DC voltage signals with input-side cluster value holder. She finds at the transmission of digital signals, for example in time division multiplexing Push train control.

Bekannte Vorrichtungen zur potentialfreien Übertragung von Gleichspannungssignalen bestehen aus Relais und/oder Übertragern. Die Nachteile dieser Anordnungen liegen in der begrenzten Lebensdauer der Riais, ihrer nicht ausreichenden Spannungsfestigkeit, mangelnder Schaltfrequenz und hohem Platzbedarf. Known devices for potential-free transmission of direct voltage signals consist of relays and / or transformers. The disadvantages of these arrangements are in the limited lifespan of the Riais, their insufficient dielectric strength, insufficient switching frequency and high space requirements.

Auch die Verwendung von Optokopplern für die Übertragung ist bekannt. Hierbei ist allerdings ein hoher Strom zur Anregung der Leuchtdiode und ein zusätzlicher Vorwiderstand zur Reduzierung der hohen Eingangsgleichspannung auf die zulässige Diodenspannung erforderlich. Durch den Vorwiderstand entsteht eine zusätzliche Wärmebelastung und ein erhöhter Platzbedarf. The use of optocouplers for transmission is also known. In this case, however, there is a high current to excite the light-emitting diode and an additional one Series resistor to reduce the high DC input voltage to the permissible Diode voltage required. The series resistor creates an additional thermal load and an increased space requirement.

Ein Optokoppler erfordert höhren Schaltungsaufwand. An optocoupler requires a lot of circuitry.

Es ist deshalb Aufgabe der Erfindung, ein Eingangsgleichspannungssignal nur mit passiven Bauelementen potentialfrei zu uebertragen und am Ausgang einen Pegel zur Verfügung zu stellen, der von integrierten Schaltkreisen verarbeitet werden kann. It is therefore the object of the invention to provide a DC input voltage signal potential-free only with passive components to be transferred and on Output to provide a level that is used by integrated circuits can be processed.

Erfindungsgemäß wird dies dadurch erreicht, daß eine Triggerdiodein Reihe mit der Primärwicklung eines Übertragers liegt, daß diese Reihenschaltung parallel zu einem mittels einer Gleichspannungsquelle über einen Widerstand aufladbaren Kondensator geschaltet ist und daß die Triggerdiode eine bidirektionale Arbeitskennlinie besitzt.According to the invention this is achieved in that a trigger diode Series with the primary winding of a transformer is that this series connection parallel to a chargeable by means of a DC voltage source via a resistor Capacitor is connected and that the trigger diode has a bidirectional working characteristic owns.

Vorteilhaft nach dem erfindungsgemäßen Verfahren ist besonders die bipolare Ausführung der Schaltung. Durch den Einsatz einer Triggerdiode kann die erfindungsgemäße Übertragungseinrichtung einfach und billig hergestellt werden. Es wird also eine leistungsarme, potentialfreie, platzsparende Eingabeschaltung für digitale Signale erzielt, die auch Eingangsspannungen mit großem Toleranzbereich verarbeiten kann.The method according to the invention is particularly advantageous bipolar execution of the circuit. By using a trigger diode, the Transmission device according to the invention can be produced easily and cheaply. So it becomes a low-power, potential-free, space-saving input circuit for digital signals that also have input voltages with a large tolerance range can handle.

Ein Ausführungsbeispiel des erfindungsgemäßen Verfahrens wird nachstehend anhand der Zeichnung näher beschrieben.An embodiment of the method according to the invention is shown below described in more detail with reference to the drawing.

Beim Anlegen einer Eingangsgleichspannung von 110V an die Eingangsklemmen lädt sich der Kondensator 1 über den Widerstand 2 nach einer e-Funktion auf. Nach einer gewissen Zeit erreicht die Spannung über dem Kondensator die Zündspannung einer Triggerdiode 3. Die Triggerdiode schaltet bei Erreichen dieser Zündspannung schlagartig durch und entlädt dadurch den Kondensator 1 über die Primärseite eines Transformators 4.When applying a DC input voltage of 110V to the input terminals the capacitor 1 charges up via the resistor 2 according to an exponential function. To After a certain time, the voltage across the capacitor reaches the ignition voltage a trigger diode 3. The trigger diode switches when this ignition voltage is reached abruptly through and thereby discharges the capacitor 1 via the primary side of a Transformer 4.

Dieser Entladeimpuls des Kondensators wird auf die Sekundärseite des Transformators übertragen.This discharge pulse of the capacitor is transferred to the secondary side of the Transformer transferred.

Nach Abklingen des Entladestromes aus dem Kondensator 1 löscht die Triggerdiode 3 (z.B. Diac), d.h., die Triggerdiode wird hochohmig und der Kondensator 1 lädt sich wieder auf. Die schwingende Anordnung erzeugt auf der Sekundärseite des Ubertragers Impulse, die an den Ausgangsklemmen für die weitere Auswertung zur Verfügung stehen.After the discharge current from the capacitor 1 has decayed, the Trigger diode 3 (e.g. Diac), i.e. the trigger diode becomes high-resistance and the capacitor 1 is recharging. The oscillating arrangement is generated on the secondary side of the transmitter pulses that are sent to the output terminals for further evaluation To be available.

Die erfindungsgemäße Anordnung ist bipolar.The arrangement according to the invention is bipolar.

Am Ausgang des Transformators erscheint also eine impulsförmige Nadel mit der Frequenz der Kondensatorladung bzw.A pulse-shaped needle appears at the output of the transformer with the frequency of the capacitor charge or

-entladung. Diese impulsförmige Spannung wird gleichgerichtet und gesiebt und steht zur Auswertung für Operationsverstärker zur Verfügung.-discharge. This pulsed voltage is rectified and sieved and is available for evaluation for operational amplifiers.

Die Impulse an den Ausgangsklemmen des Transformators 4 können nur auftreten, wenn die Anordnung schwingt. Bei Ausfall der Triggerdiode 3 oder des Übertragers 4 oder des Kondensators 1 oder Widerstand 2 kann die. Anordnung nicht mehr schwingen und damit stehen keine auswertbaren Impulse auf der Sekundärseite des Ubertragers zur Verfügung,The pulses at the output terminals of the transformer 4 can only occur when the arrangement oscillates. If the trigger diode 3 or the Transformer 4 or the capacitor 1 or resistor 2 can. Arrangement not vibrate more and thus there are no evaluable impulses on the secondary side of the transmitter available,

Claims (1)

Patentanspruch Vorrichtung zur potentilfreien Eingabe von Gleichspannungssignalen mit eingangseitigem Schwellwertschalter, dadurch gekennzeichnet, daß eine Triggerdiode (3) in Reihe mit der Primärwicklung eines Übertragers (4) liegt, daß diese Reihenschaltung parallel zu einem mittels einer Gleichspannungsquelle über einen Widerstand (2) aufladbaren Kondensator (1) geschaltet ist und daß die Triggerdiode (3) eine bidirektionale Arbeitskennlinie besitzt. Claim device for potential-free input of direct voltage signals with threshold value switch on the input side, characterized in that a trigger diode (3) in series with the primary winding of a transformer (4) is that this series connection parallel to one by means of a DC voltage source via a resistor (2) chargeable capacitor (1) is connected and that the trigger diode (3) is a bidirectional Has working characteristic.
DE19752535698 1975-08-09 1975-08-09 DC isolating circuit for TDM transmission system - has dial triggered by capacitor and discharging capacitor through primary winding Ceased DE2535698A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19752535698 DE2535698A1 (en) 1975-08-09 1975-08-09 DC isolating circuit for TDM transmission system - has dial triggered by capacitor and discharging capacitor through primary winding
AT556576A AT351111B (en) 1975-08-09 1976-07-28 DEVICE FOR POTENTIAL-FREE INPUT OF DC VOLTAGE SIGNALS
CH1006376A CH595015A5 (en) 1975-08-09 1976-08-06

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19752535698 DE2535698A1 (en) 1975-08-09 1975-08-09 DC isolating circuit for TDM transmission system - has dial triggered by capacitor and discharging capacitor through primary winding

Publications (1)

Publication Number Publication Date
DE2535698A1 true DE2535698A1 (en) 1977-02-17

Family

ID=5953700

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19752535698 Ceased DE2535698A1 (en) 1975-08-09 1975-08-09 DC isolating circuit for TDM transmission system - has dial triggered by capacitor and discharging capacitor through primary winding

Country Status (3)

Country Link
AT (1) AT351111B (en)
CH (1) CH595015A5 (en)
DE (1) DE2535698A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3201617A1 (en) * 1981-01-26 1982-12-16 Delcon Oy, 00620 Helsinki ADAPTER FOR THE FIELD SIGNALS TO ELECTRONIC COMPUTERS, MICROPROCESSOR SYSTEMS OR SIMILAR ELECTRONIC DIGITAL CIRCUITS
DE3421575A1 (en) * 1984-06-09 1985-12-12 Erich Dr.-Ing. 5300 Bonn Steingroever Electrical pulse generator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3201617A1 (en) * 1981-01-26 1982-12-16 Delcon Oy, 00620 Helsinki ADAPTER FOR THE FIELD SIGNALS TO ELECTRONIC COMPUTERS, MICROPROCESSOR SYSTEMS OR SIMILAR ELECTRONIC DIGITAL CIRCUITS
DE3421575A1 (en) * 1984-06-09 1985-12-12 Erich Dr.-Ing. 5300 Bonn Steingroever Electrical pulse generator

Also Published As

Publication number Publication date
AT351111B (en) 1979-07-10
CH595015A5 (en) 1978-01-31
ATA556576A (en) 1978-12-15

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Legal Events

Date Code Title Description
OD Request for examination
8131 Rejection