EP0432623A1 - Failure detection circuit for multifilament lamps in signalling devices - Google Patents

Failure detection circuit for multifilament lamps in signalling devices Download PDF

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Publication number
EP0432623A1
EP0432623A1 EP90123329A EP90123329A EP0432623A1 EP 0432623 A1 EP0432623 A1 EP 0432623A1 EP 90123329 A EP90123329 A EP 90123329A EP 90123329 A EP90123329 A EP 90123329A EP 0432623 A1 EP0432623 A1 EP 0432623A1
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EP
European Patent Office
Prior art keywords
main thread
optocoupler
thread
circuit according
switch
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Granted
Application number
EP90123329A
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German (de)
French (fr)
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EP0432623B1 (en
Inventor
Hellmuth Fricke
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Siemens AG
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Siemens AG
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/10—Circuits providing for substitution of the light source in case of its failure

Definitions

  • the invention relates to a circuit according to the preamble of claim 1.
  • Such a circuit is known from DE-PS 11 81 792.
  • a monitoring circuit for main and secondary threads of incandescent lamps, in particular signal lamps, is described there, in which, when the main thread is switched on, its operational behavior and at the same time a voltage indicator monitor the readiness for switching on of the associated secondary thread by means of a current indicator.
  • Two monitoring messages are generated for each signal lamp, one for the main thread and one for the secondary thread; the two monitoring messages are transmitted to a preferably remote evaluation device and evaluated there individually or they are summarized and evaluated together.
  • the object of the invention is to provide a circuit according to the preamble of claim 1, which enables the identification of the respective operating state of a signal lamp and the identification of the readiness to switch on its secondary thread when the main thread is switched on by means of a single monitoring message via a single transmission channel to a remote monitoring point.
  • FIG. 1 shows a signal lamp L which, if required, can be switched on when voltage is applied to the primary winding of a lamp transformer T1.
  • the signal lamp L has a main thread HF and a secondary thread NF connected in parallel with it.
  • the main thread HF usually lights up; the secondary thread NF is switched off and only takes over its function if the main thread fails.
  • a current indicator JH is connected in series with the main thread HF, which serves to switch on the secondary thread if the main thread is defective. As long as a lamp current flows over the main thread, the secondary thread circuit is separated via the normally closed contact JH / 1 of the main thread monitor.
  • the signal lamp is switched on, current flows briefly over both lamp threads until the current indicator JH responds.
  • a current-sensitive detector M connected in series with the secondary thread NF of the signal lamp is connected in parallel with the normally closed contact JH / 1 of the current indicator JH lying in series with the main thread HF.
  • This detector is used to output a fault message to a remote evaluation device (not shown) in the event that the supply circuit leading via the main thread HF is switched off when the signal lamp is switched on or the monitoring circuit of the signal lamp is broken via the secondary thread NF when the main thread is intact.
  • the detector M forwards a monitoring message, which characterizes the respective operating state of the signal lamp monitored by it, to the remote evaluation device via a contact M / 1.
  • the detector M is excited and sends a message to the evaluation device which indicates the correct operating state of the signal lamp.
  • the detector M is so high-impedance or the detection circuit is so high-impedance that the signaling current flowing through the secondary thread NF not yet warmed the secondary thread. This prevents the secondary thread from being loaded electrically when the main thread is still intact.
  • the current indicator JH drops and closes its normally closed contact JH / 1 in the feed circuit of the secondary thread.
  • the secondary thread is automatically switched on and takes over the tasks of the defective main thread of the signal lamp.
  • the detector M is short-circuited via the closed normally closed contact JH / 1 of the dropped current indicator JH.
  • the detector M drops and reports via its contact M / 1 to the remote evaluation device that a fault has occurred on the signal lamp L, which necessitates the use of the fault or maintenance service.
  • a fault message can also be triggered when the feed circuit leading over the main thread has become so high-resistance that the main thread no longer lights up at full brightness.
  • the monitoring circuit leading over the secondary thread and the detector is interrupted while the signal lamp is switched on and the main thread is intact, there is no longer any redundancy for the main thread. This should also be reported to the malfunction and maintenance personnel as early as possible so that the malfunction that has occurred can, if possible, be remedied before a malfunction occurs in the main thread circle. If the monitoring circuit guided over the secondary thread and the detector is broken, the detector M reacts to it in the same way as if the current indicator JH had indicated a fault in the main thread circuit of the signal lamp, i.e. it drops out and reports this fault via its contact M / 1 to the remote evaluation point.
  • FIG 2 shows an embodiment of the circuit according to the invention with only electronic switching means for monitoring the operating state of a signal lamp L.
  • the supply circuits of the two filaments of the signal lamp are drawn thick as in Figure 1, while the switching means of the actual monitoring circuit by thin lines together are connected.
  • the signal lamp is in turn supplied via a lamp transformer T1, to whose primary winding a supply AC voltage can be connected if necessary.
  • the monitoring circuit is supplied with power from a rectifier G which is connected on the input side to the secondary winding of the lamp transformer T1.
  • the current indicator JH which is in series with the main thread HF of the signal lamp L, is formed from an optocoupler U1 coupled to the main thread feed circuit via a current transformer T2 and having input diodes connected in anti-parallel.
  • the switching transistor of the optocoupler U1 is switched to a low resistance and controls a downstream electronic switch S1 designed as a field effect transistor.
  • This switch short-circuits the transmission diode of an optoelectronically controlled AC switch U2, which is used to control a triac TR.
  • This triac has the function of the switching contact JH / 1 shown in FIG. 1.
  • Main thread monitor JH, switch S1, AC switch U2 and triac TR together form a main / auxiliary thread switch HNU1.
  • the triac TR has a high resistance and interrupts the feed circuit for the secondary thread NF.
  • the transmission diodes of a further optocoupler U3 are connected in parallel with the triac TR via a series resistor R.
  • the switching transistor of this optocoupler has a low resistance when the secondary thread feed circuit is opened.
  • the control potential then present at the gate of a further electronic switch S2 designed as a field effect transistor has the effect that the source-drain path of this switch has a low resistance.
  • the transmission diode of another optocoupler U4 is short-circuited; the associated switching transistor has a high impedance for sending a message, which characterizes the correct operating state of the monitored signal lamp, to the remote evaluation device.
  • the switching transistor of the optocoupler U1 becomes high-resistance and the electronic switch S1 arranged downstream of it is blocked.
  • the Transmitting diode of the AC switch U2 is then no longer short-circuited; it is energized and causes the internal AC switch to switch; this results in the control of the triac, via which the auxiliary thread of the signal lamp is switched on.
  • the triac TR briefly switches the input diodes of the optocoupler U3, so that the switching path of the associated switching transistor becomes high-resistance.
  • the control potential present at the gate of the electronic switch S2 changes, as a result of which the source-drain path of this switch becomes high-resistance.
  • the short circuit for the input diode of the optocoupler U4 is eliminated, so that the optocoupler responds and outputs a fault message for the monitored signal lamp via its switching transistor.
  • a corresponding fault message is also triggered if the secondary thread circuit of the signal lamp is interrupted while the intact main thread is switched on.
  • the transmission diodes of the optocoupler U3 are also de-energized, so that the associated switching transistor becomes high-resistance and the positive control potential is separated from the gate of the electronic switch S2.
  • the switch S2 becomes high-resistance and the optocoupler U4 can respond.
  • the optocoupler U1 used as a current indicator does not necessarily have to be connected to the secondary winding of a current transformer; it can also be connected in parallel to a burden lying in the main thread circle.
  • a main thread monitor designed as a relay or optocoupler any other known monitor, in particular also voltage-controlled monitors, can be used. An embodiment of this is shown in Fig. 3; the designations introduced in FIG. 2 are retained for corresponding components.
  • the main / secondary thread switch HNU2 shown in FIG. 3 differs essentially from that of FIG. 2 in that the indicator lying in series with the main thread of the signal lamp L does not show the feed current flowing over the main thread the signal lamp, but an independent current that can only flow when the main thread is intact.
  • the optocoupler U1 used as an indicator is fed on the input side via the main thread HF of the signal lamp from the lamp transformer T1.
  • the current-carrying state that is to say with the main thread intact, it switches through an AC switch TRM designed as a triac in the feed circuit of the main thread of the signal lamp and thus causes the signal lamp L to be switched on via its main thread.
  • the switching distance of the AC switch TRH becomes high-resistance because the holding current of the AC switch is undercut.
  • the sequence of action of the other switching means of the main / secondary thread switch HNU2 corresponds to that of the main / secondary thread switch HNU1 in FIG Signal lamp signals.
  • a corresponding optocoupler in series with the switching path of the electronic switch S1 or in series with the switching path of the switching transistor of the first optocoupler U1 could serve to identify the switched main thread HF of the signal lamp.
  • the detector M is activated to output a fault message and that the monitored signal lamp is to be switched off when the operating state is operating properly.
  • the switching transistor of the optocoupler U1 can also short-circuit the transmission diode of the optoelectronically controllable AC switch U2 directly or the supply circuit thereof cut open. Because of the ripple of the voltage supplied to the transmitter diodes of the optocoupler U1, a very low pulsating DC voltage will be able to be tapped at the switching path of the optocoupler switching transistor. In order to prevent the optoelectronically controllable AC switch U2 from turning on as a result of this DC voltage, a capacitor for smoothing this voltage must be connected in parallel with the switching path of the optocoupler switching transistor.
  • a zener diode must be connected in series with the transmitter diode of the optoelectronically controllable AC switch U2, the zener voltage of which is at least equal to the voltage across the capacitor when the optocoupler switching transistor is controlled. This Zener voltage is added to the forward voltage of the transmitter diode of the optoelectronically controllable AC switch and prevents the control of this switch when the main thread is illuminated.
  • This optocoupler can also be controlled directly by the switching transistor of the optocoupler U3 by short-circuiting the transmitting diode of the optocoupler U4 if necessary or opening its supply circuit.
  • This optocoupler can also be controlled directly by the switching transistor of the optocoupler U3 by short-circuiting the transmitting diode of the optocoupler U4 if necessary or opening its supply circuit.
  • separate precautions must be taken to render the residual voltage present at its switching path when the switching transistor of the optocoupler U3 is activated.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The circuit is designed such that it assumes a first switching state when a monitored signalling lamp (L) is operating correctly, and a second switching state in the event of a fault. A fault is regarded as the interruption of the supply circuit passing through the main filament (HF) when the signalling lamp is switched on and, when the main filament is intact, lack of readiness of the standby filament (NF) of this signalling lamp to switch on. An alarm (M), which is connected in series with the standby filament of the signalling lamp in a high-resistance manner, is used to emit a monitoring alarm. This alarm is short-circuited by the switching means (JH/1) of an indicator (JH) connected in series with the main filament, when the main filament circuit is broken, and is also deactivated when the standby filament circuit is broken. The circuit is particularly suitable for functional monitoring of signalling lamps in railway signalling lights. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Schaltung nach dem Oberbegriff des Patentanspruches 1.The invention relates to a circuit according to the preamble of claim 1.

Eine derartige Schaltung ist aus der DE-PS 11 81 792 bekannt. Dort ist eine Überwachungsschaltung für Haupt- und Nebenfäden von Glühlampen, insbesondere Signallampen, beschrieben, bei der bei angeschaltetem Hauptfaden durch einen Stromindikator dessen Funktionsverhalten und gleichzeitig durch einen Spannungsindikator die Einschaltbereitschaft des zugehörigen Nebenfadens überwacht wird. Für jede Signallampe werden zwei Überwachungsmeldungen gebildet, eine für den Haupt- und eine für den Nebenfaden; die beiden Überwachungsmeldungen werden an eine vorzugsweise ferne Auswerteeinrichtung übertragen und dort einzeln bewertet oder sie wer den zusammengefaßt und gemeinsam bewertet.Such a circuit is known from DE-PS 11 81 792. A monitoring circuit for main and secondary threads of incandescent lamps, in particular signal lamps, is described there, in which, when the main thread is switched on, its operational behavior and at the same time a voltage indicator monitor the readiness for switching on of the associated secondary thread by means of a current indicator. Two monitoring messages are generated for each signal lamp, one for the main thread and one for the secondary thread; the two monitoring messages are transmitted to a preferably remote evaluation device and evaluated there individually or they are summarized and evaluated together.

Aufgabe der Erfindung ist es, eine Schaltung nach dem Oberbegriff des Patentanspruches 1 anzugeben, welche die Kennzeichnung des jeweiligen Betriebszustandes einer Signallampe und die Kennzeichnung der Einschaltbereitschaft ihres Nebenfadens bei angeschaltetem Hauptfaden mittels einer einzigen Überwachungsmeldung über einen einzigen Übertragungskanal zu einer fernen Überwachungsstelle ermöglicht.The object of the invention is to provide a circuit according to the preamble of claim 1, which enables the identification of the respective operating state of a signal lamp and the identification of the readiness to switch on its secondary thread when the main thread is switched on by means of a single monitoring message via a single transmission channel to a remote monitoring point.

Die Erfindung löst diese Aufgabe durch die kennzeichnenden Merkmale des Patentanspruches 1. Vorteilhafte Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Schaltung sind in den Unteransprüchen angegeben.The invention solves this problem by the characterizing features of claim 1. Advantageous refinements and developments of the circuit according to the invention are specified in the subclaims.

Ausführungsbeispiele der Erfindung sind nachstehend unter Bezugnahme auf die Zeichnung näher erläutert. Die Zeichnung zeigt:

in Figur 1
das der erfindungsgemäßen Schaltung zugrundeliegende Schaltprinzip,
in Figur 2
eine Ausführungsform dieser Schaltung, wie sie für moderne Lichtsignalanlagen mit elektronischen Bauelementen verwendet sein kann und
in Figur 3
eine Ausführungsform der Schaltung mit einem anders aufgebauten Haupt/Nebenfadenumschalter.
Embodiments of the invention are explained below with reference to the drawing. The drawing shows:
in Figure 1
the switching principle on which the circuit according to the invention is based,
in Figure 2
an embodiment of this circuit, as it can be used for modern traffic signal systems with electronic components and
in Figure 3
an embodiment of the circuit with a differently constructed main / secondary thread switch.

Figur 1 zeigt eine Signallampe L, die beim Anlegen von Spannung an die Primärwicklung eines Lampentransformators T1 bedarfsweise anschaltbar ist. Die Signallampe L besitzt einen Hauptfaden HF und einen diesem parallelgeschalteten Nebenfaden NF. Bei angeschalteter Signallampe leuchtet üblicherweise der Hauptfaden HF auf; der Nebenfaden NF ist abgeschaltet und übernimmt erst bei Ausfall des Hauptfadens dessen Funktion. Mit dem Hauptfaden HF ist ein Stromindikator JH in Reihe geschaltet, der dazu dient, den Nebenfaden bei defektem Hauptfaden anzuschalten. Solange ein Lampenstrom über den Hauptfaden fließt, ist der Nebenfadenkreis über den Ruhekontakt JH/1 des Hauptfadenüberwachers aufgetrennt. Beim Anschalten der Signallampe fließt bis zum Ansprechen des Stromindikators JH kurzzeitig über beide Lampenfäden Strom.FIG. 1 shows a signal lamp L which, if required, can be switched on when voltage is applied to the primary winding of a lamp transformer T1. The signal lamp L has a main thread HF and a secondary thread NF connected in parallel with it. When the signal lamp is switched on, the main thread HF usually lights up; the secondary thread NF is switched off and only takes over its function if the main thread fails. A current indicator JH is connected in series with the main thread HF, which serves to switch on the secondary thread if the main thread is defective. As long as a lamp current flows over the main thread, the secondary thread circuit is separated via the normally closed contact JH / 1 of the main thread monitor. When the signal lamp is switched on, current flows briefly over both lamp threads until the current indicator JH responds.

Dem Ruhekontakt JH/1 des mit dem Hauptfaden HF in Reihe liegenden Stromindikators JH ist ein mit dem Nebenfaden NF der Signallampe in Reihe geschalteter stromempfindlicher Melder M parallelgeschaltet. Dieser Melder dient zur Ausgabe einer Störungsmeldung an eine nicht dargestellte ferne Auswerteeinrichtung für den Fall, daß bei angeschalteter Signallampe der über den Hauptfaden HF führende Speisekreis oder bei intaktem angeschaltetem Hauptfaden der über den Nebenfaden NF geführte Überwachungskreis der Signallampe unterbrochen ist. Der Melder M gibt eine den jeweiligen Betriebszustand der von ihm überwachten Signallampe kennzeichnende Überwachungsmeldung über einen Kontakt M/1 an die ferne Auswerteeinrichtung weiter. In dem angenommenen Ausführungsbeispiel mit intaktem Haupt- und intaktem Nebenfaden ist der Melder M erregt und gibt eine den ordnungsgerechten Betriebszustand der Signallampe kennzeichende Meldung an die Auswerteeinrichtung. Der Melder M ist dabei so hochohmig bzw. der Meldekreis ist so hochohmig ausgeführt, daß der über den Nebenfaden NF fließende Meldestrom den Nebenfaden noch nicht erwärmt. Damit wird verhindert, daß der Nebenfaden bei noch intaktem Hauptfaden elektrisch belastet wird.A current-sensitive detector M connected in series with the secondary thread NF of the signal lamp is connected in parallel with the normally closed contact JH / 1 of the current indicator JH lying in series with the main thread HF. This detector is used to output a fault message to a remote evaluation device (not shown) in the event that the supply circuit leading via the main thread HF is switched off when the signal lamp is switched on or the monitoring circuit of the signal lamp is broken via the secondary thread NF when the main thread is intact. The detector M forwards a monitoring message, which characterizes the respective operating state of the signal lamp monitored by it, to the remote evaluation device via a contact M / 1. In the assumed exemplary embodiment with the main thread and the secondary thread intact, the detector M is excited and sends a message to the evaluation device which indicates the correct operating state of the signal lamp. The detector M is so high-impedance or the detection circuit is so high-impedance that the signaling current flowing through the secondary thread NF not yet warmed the secondary thread. This prevents the secondary thread from being loaded electrically when the main thread is still intact.

Brennt der Hauptfaden der Signallampe durch oder wird der über den Hauptfaden führende Speisekreis in irgendeiner Weise unterbrochen, dann fällt der Stromindikator JH ab und schließt seinen Ruhekontakt JH/1 im Speisekreis des Nebenfadens. Dabei wird der Nebenfaden automatisch angeschaltet und übernimmt die Aufgaben des defekten Hauptfadens der Signallampe. Über den geschlossenen Ruhekontakt JH/1 des abgefallenen Stromindikators JH wird der Melder M kurzgeschlossen. Der Melder M fällt ab und meldet über seinen Kontakt M/1 an die ferne Auswerteeinrichtung, daß an der Signallampe L eine Störung aufgetreten ist, die den Einsatz des Störungs- oder Wartungsdienstes erforderlich macht. Eine Störungsmeldung kann auch bereits dann ausgelöst werden, wenn der über den Hauptfaden führende Speisekreis so hochohmig geworden ist, daß der Hauptfaden nicht mehr in voller Leuchtstärke aufleuchtet.If the main thread of the signal lamp burns out or the feed circuit leading over the main thread is interrupted in any way, then the current indicator JH drops and closes its normally closed contact JH / 1 in the feed circuit of the secondary thread. The secondary thread is automatically switched on and takes over the tasks of the defective main thread of the signal lamp. The detector M is short-circuited via the closed normally closed contact JH / 1 of the dropped current indicator JH. The detector M drops and reports via its contact M / 1 to the remote evaluation device that a fault has occurred on the signal lamp L, which necessitates the use of the fault or maintenance service. A fault message can also be triggered when the feed circuit leading over the main thread has become so high-resistance that the main thread no longer lights up at full brightness.

Wird bei angeschalteter Signallampe und intaktem Hauptfaden der über den Nebenfaden und den Melder führende Überwachungskreis unterbrochen, besteht für den Hauptfaden keine Redundanz mehr. Auch dies ist dem Störungs- und Wartungspersonal möglichst frühzeitig anzuzeigen, damit die aufgetretene Störung nach Möglichkeit behoben werden kann, bevor eine Störung im Hauptfadenkreis auftritt. Ist der über den Nebenfaden und den Melder geführte Überwachungskreis aufgetrennt, so reagiert der Melder M darauf in gleicher Weise, als ob der Stromindikator JH eine Störung im Hauptfadenkreis der Signallampe angezeigt hätte, d.h. er fällt ab und meldet diese Störung über seinen Kontakt M/1 an die ferne Auswertestelle.If the monitoring circuit leading over the secondary thread and the detector is interrupted while the signal lamp is switched on and the main thread is intact, there is no longer any redundancy for the main thread. This should also be reported to the malfunction and maintenance personnel as early as possible so that the malfunction that has occurred can, if possible, be remedied before a malfunction occurs in the main thread circle. If the monitoring circuit guided over the secondary thread and the detector is broken, the detector M reacts to it in the same way as if the current indicator JH had indicated a fault in the main thread circuit of the signal lamp, i.e. it drops out and reports this fault via its contact M / 1 to the remote evaluation point.

Figur 2 zeigt eine Ausführungsform der erfindungsgemäßen Schaltung mit ausschließlich elektronischen Schaltmitteln zum Überwachen des Betriebszustandes einer Signallampe L. Die Speisekreise der beiden Lampenfäden der Signallampe sind wie in Figur 1 dick ausgezogen, während die Schaltmittel der eigentlichen Überwachungsschaltung durch dünnere Linien miteinander verbunden sind. Die Speisung der Signallampe erfolgt wiederum über einen Lampentransformator T1, an dessen Primärwicklung bedarfsweise eine Speisewechselspannung anschaltbar ist. Die Stromversorgung der Überwachungsschaltung erfolgt aus einem Gleichrichter G, der eingangsseitig an die Sekundärwicklung des Lampentransformators T1 angeschlossen ist. Der mit dem Hauptfaden HF der Signallampe L in Reihe liegende Stromindikator JH wird gebildet aus einem über einen Stromwandler T2 an den Hauptfaden-Speisekreis angekoppelten Optokoppler U1 mit antiparallel geschalteten Eingangsdioden. Bei einem ausreichend hohen über den Hauptfaden fließenden Lampenstrom wird der Schalttransistor des Optokopplers U1 niederohmig geschaltet und steuert einen nachgeordneten, als Feldeffekttransistor ausgebildeten elektronischen Schalter S1 durch. Dieser Schalter schließt dabei die Sendediode eines optoelektronisch angesteuerten Wechselstromschalters U2 kurz, der zur Steuerung eines Triacs TR dient. Dieser Triac hat die Funktion des in Figur 1 dargestellten Schaltkontaktes JH/1. Hauptfadenüberwacher JH, Schalter S1, Wechselstromschalter U2 und Triac TR bilden zusammen einen Haupt/Nebenfadenumschalter HNU1. Solange der elektronische Schalter S1 die Sendediode des Wechselstromschalters U2 kurzschließt, ist der Triac TR hochohmig und unterbricht den Speisekreis für den Nebenfaden NF. Dem Triac TR über einen Vorwiderstand R parallelgeschaltet sind die Sendedioden eines weiteren Optokopplers U3. Der Schalttransistor dieses Optokopplers ist bei aufgetrenntem Nebenfaden-Speisekreis niederohmig. Das dann am Gate eines als Feldeffekttransistor ausgebildeten weiteren elektronischen Schalters S2 anliegende Steuerpotential bewirkt, daß die Source-Drain-Strecke dieses Schalters niederohmig ist. Bei diesem Schaltzustand des elektronischen Schalters ist die Sendediode eines weiteren Optokopplers U4 kurzgeschlossen; der zugehörige Schalttransistor ist hochohmig zur Abgabe einer den ordnungsgerechten Betriebszustand der überwachten Signallampe kennzeichnenden Meldung an die ferne Auswerteeinrichtung.Figure 2 shows an embodiment of the circuit according to the invention with only electronic switching means for monitoring the operating state of a signal lamp L. The supply circuits of the two filaments of the signal lamp are drawn thick as in Figure 1, while the switching means of the actual monitoring circuit by thin lines together are connected. The signal lamp is in turn supplied via a lamp transformer T1, to whose primary winding a supply AC voltage can be connected if necessary. The monitoring circuit is supplied with power from a rectifier G which is connected on the input side to the secondary winding of the lamp transformer T1. The current indicator JH, which is in series with the main thread HF of the signal lamp L, is formed from an optocoupler U1 coupled to the main thread feed circuit via a current transformer T2 and having input diodes connected in anti-parallel. If the lamp current flowing through the main thread is sufficiently high, the switching transistor of the optocoupler U1 is switched to a low resistance and controls a downstream electronic switch S1 designed as a field effect transistor. This switch short-circuits the transmission diode of an optoelectronically controlled AC switch U2, which is used to control a triac TR. This triac has the function of the switching contact JH / 1 shown in FIG. 1. Main thread monitor JH, switch S1, AC switch U2 and triac TR together form a main / auxiliary thread switch HNU1. As long as the electronic switch S1 short-circuits the transmission diode of the AC switch U2, the triac TR has a high resistance and interrupts the feed circuit for the secondary thread NF. The transmission diodes of a further optocoupler U3 are connected in parallel with the triac TR via a series resistor R. The switching transistor of this optocoupler has a low resistance when the secondary thread feed circuit is opened. The control potential then present at the gate of a further electronic switch S2 designed as a field effect transistor has the effect that the source-drain path of this switch has a low resistance. In this switching state of the electronic switch, the transmission diode of another optocoupler U4 is short-circuited; the associated switching transistor has a high impedance for sending a message, which characterizes the correct operating state of the monitored signal lamp, to the remote evaluation device.

Ist der Hauptfadenkreis der Signallampe gestört, so wird der Schalttransistor des Optokopplers U1 hochohmig und der ihm nachgeordnete elektronische Schalter S1 wird gesperrt. Die Sendediode des Wechselstromschalters U2 wird dann nicht mehr kurzgeschlossen; sie ist stromdurchflossen und bewirkt ein Durchschalten des internen Wechselstromschalters; dies hat die Durchsteuerung des Triacs zur Folge, über den die Anschaltung des Nebenfadens der Signallampe erfolgt. Außerdem schaltet der Triac TR die Eingangsdioden des Optokopplers U3 kurz, so daß die Schaltstrecke des zugehörigen Schalttransistors hochohmig wird. Dabei ändert sich das am Gate des elektronischen Schalters S2 anliegende Steuerpotential, wodurch die Source-Drain-Strecke dieses Schalters hochohmig wird. Bei diesem Schaltzustand des elektronischen Schalters S2 ist der Kurzschluß für die Eingangsdiode des Optokopplers U4 aufgehoben, so daß der Optokoppler anspricht und über seinen Schalttransistor eine Störungsmeldung für die überwachte Signallampe ausgibt.If the main thread circuit of the signal lamp is disturbed, the switching transistor of the optocoupler U1 becomes high-resistance and the electronic switch S1 arranged downstream of it is blocked. The Transmitting diode of the AC switch U2 is then no longer short-circuited; it is energized and causes the internal AC switch to switch; this results in the control of the triac, via which the auxiliary thread of the signal lamp is switched on. In addition, the triac TR briefly switches the input diodes of the optocoupler U3, so that the switching path of the associated switching transistor becomes high-resistance. The control potential present at the gate of the electronic switch S2 changes, as a result of which the source-drain path of this switch becomes high-resistance. In this switching state of the electronic switch S2, the short circuit for the input diode of the optocoupler U4 is eliminated, so that the optocoupler responds and outputs a fault message for the monitored signal lamp via its switching transistor.

Eine entsprechende Störungsmeldung wird auch ausgelöst, wenn bei angeschaltetem intaktem Hauptfaden der Nebenfadenkreis der Signallampe unterbrochen wird. In diesem Fall werden die Sendedioden des Optokopplers U3 ebenfalls stromlos, so daß der zugehörige Schalttransistor hochohmig wird und das positive Steuerpotential vom Gate des elektronischen Schalters S2 abtrennt. Der Schalter S2 wird dabei hochohmig und der Optokoppler U4 kann ansprechen.A corresponding fault message is also triggered if the secondary thread circuit of the signal lamp is interrupted while the intact main thread is switched on. In this case, the transmission diodes of the optocoupler U3 are also de-energized, so that the associated switching transistor becomes high-resistance and the positive control potential is separated from the gate of the electronic switch S2. The switch S2 becomes high-resistance and the optocoupler U4 can respond.

Der als Stromindikator verwendete Optokoppler U1 muß nicht unbedingt an die Sekundärwicklung eines Stromwandlers angeschlossen sein; er kann auch einer im Hauptfadenkreis liegenden Bürde parallelgeschaltet sein. Anstelle eines als Relais oder Optokoppler ausgebildeten Hauptfadenüberwachers kann jeder andere bekannte Überwacher, insbesondere auch spannungsgesteuerte Überwacher, verwendet sein. Ein Ausführungsbeispiel hierfür ist in Fig. 3 dargestellt; für einander entsprechende Bauelemente werden die in Fig. 2 eingeführten Bezeichnungen beibehalten.The optocoupler U1 used as a current indicator does not necessarily have to be connected to the secondary winding of a current transformer; it can also be connected in parallel to a burden lying in the main thread circle. Instead of a main thread monitor designed as a relay or optocoupler, any other known monitor, in particular also voltage-controlled monitors, can be used. An embodiment of this is shown in Fig. 3; the designations introduced in FIG. 2 are retained for corresponding components.

Der in Fig. 3 dargestellte Haupt/Nebenfadenumschalter HNU2 unterscheidet sich im wesentlichen dadurch von dem der Fig. 2, daß der mit dem Hauptfaden der Signallampe L in Reihe liegende Indikator nicht den über den Hauptfaden fließenden Speisestrom der Signallampe bewertet, sondern einen davon unabhängigen Strom, der nur dann fließen kann, wenn der Hauptfaden intakt ist. Zu diesem Zweck wird der als Indikator verwendete Optokoppler U1 eingangsseitig über den Hauptfaden HF der Signallampe aus dem Lampentransformator T1 gespeist. Er schaltet in stromdurchflossenem Zustand, also bei intaktem Hauptfaden, einen als Triac ausgebildeten Wechselstromschalter TRM im Speisekreis des Hauptfadens der Signallampe durch und veranlaßt damit die Anschaltung der Signallampe L über deren Hauptfaden. Brennt der Hauptfaden durch, so wird die Schaltstrecke des Wechselstromschalters TRH hochohmig, weil der Haltestrom des Wechselstromschalters unterschritten wird. Der Wirkungsablauf der übrigen Schaltmittel des Haupt/Nebenfadenumschalters HNU2 entspricht dem des Haupt/Nebenfadenumschalters HNU1 der Fig. 2. Mit der Leuchtdiode des optoelektronischen Wechselstromschalters U2 ist die Leuchtdiode eines weiteren Optokopplers U5 in Reihe geschaltet, deren Leuchten im Stellwerk das Anschalten des Nebenfadens NF der Signallampe signalisiert. Ein entsprechender Optokoppler in Reihe mit der Schaltstrecke des elektronischen Schalters S1 oder in Reihe mit der Schaltstrecke des Schaltransistors des ersten Optokopplers U1 könnte zur Kennzeichnung des angeschalteten Hauptfadens HF der Signallampe dienen.The main / secondary thread switch HNU2 shown in FIG. 3 differs essentially from that of FIG. 2 in that the indicator lying in series with the main thread of the signal lamp L does not show the feed current flowing over the main thread the signal lamp, but an independent current that can only flow when the main thread is intact. For this purpose, the optocoupler U1 used as an indicator is fed on the input side via the main thread HF of the signal lamp from the lamp transformer T1. In the current-carrying state, that is to say with the main thread intact, it switches through an AC switch TRM designed as a triac in the feed circuit of the main thread of the signal lamp and thus causes the signal lamp L to be switched on via its main thread. If the main thread burns out, the switching distance of the AC switch TRH becomes high-resistance because the holding current of the AC switch is undercut. The sequence of action of the other switching means of the main / secondary thread switch HNU2 corresponds to that of the main / secondary thread switch HNU1 in FIG Signal lamp signals. A corresponding optocoupler in series with the switching path of the electronic switch S1 or in series with the switching path of the switching transistor of the first optocoupler U1 could serve to identify the switched main thread HF of the signal lamp.

Bei den vorstehend beschriebenen Ausführungsbeispielen ist angenommen, daß der Melder M zum Ausgeben einer Störungsmeldung aktiviert wird und bei ordnungsgerechtem Betriebszustand der überwachten Signallampe abgeschaltet sein soll. Es ist jedoch auch möglich, den Melder bei ordnungsgerechtem Betriebszustand der Signallampe zu aktivieren und im Störungsfall abzuschalten. Hierzu ist es lediglich erforderlich, die Source-Drain-Strecke des elektronischen Schalters S2 nicht parallel zur Sendediode des Optokopplers U4 anzuordnen, sondern mit dieser in Reihe zu schalten.In the exemplary embodiments described above, it is assumed that the detector M is activated to output a fault message and that the monitored signal lamp is to be switched off when the operating state is operating properly. However, it is also possible to activate the detector when the signal lamp is in the correct operating state and to switch it off in the event of a fault. For this it is only necessary not to arrange the source-drain path of the electronic switch S2 parallel to the transmission diode of the optocoupler U4, but to connect them in series with the latter.

In Abweichung von den in Fig. 2 und Fig. 3 dargestellten Ausführungsbeispielen kann der Schalttransistor des Optokopplers U1 die Sendediode des optoelektronisch steuerbaren Wechselstromschalters U2 auch unmittelbar kurzschließen bzw. deren Speisekreis auftrennen. Wegen der Welligkeit der den Sendedioden des Optokopplers U1 zugeführten Spannung wird dabei an der Schaltstrecke des Optokoppler-Schalttransistors eine sehr geringe pulsierende Gleichspannung abgreifbar sein. Um zu verhindern, daß als Folge dieser Gleichspannung der optoelektronisch steuerbare Wechselstromschalter U2 durchschaltet, ist der Schaltstrecke des Optokoppler-Schalttransistors ein Kondensator zum Glätten dieser Spannung parallelzuschalten. Gegebenenfalls ist mit der Sendediode des optoelektronisch steuerbaren Wechselstromschalters U2 noch eine Zenerdiode in Reihe zu schalten, deren Zenerspannung mindestens gleich der bei durchgesteuertem Optokoppler-Schalttransistor am Kondensator liegenden Spannung ist. Diese Zenerspannung addiert sich zu der Durchlaßspannung der Sendediode des optoelektronisch steuerbaren Wechselstromschalters und verhindert bei leuchtendem Hauptfaden das Durchsteuern dieses Schalters.In a departure from the exemplary embodiments shown in FIGS. 2 and 3, the switching transistor of the optocoupler U1 can also short-circuit the transmission diode of the optoelectronically controllable AC switch U2 directly or the supply circuit thereof cut open. Because of the ripple of the voltage supplied to the transmitter diodes of the optocoupler U1, a very low pulsating DC voltage will be able to be tapped at the switching path of the optocoupler switching transistor. In order to prevent the optoelectronically controllable AC switch U2 from turning on as a result of this DC voltage, a capacitor for smoothing this voltage must be connected in parallel with the switching path of the optocoupler switching transistor. If necessary, a zener diode must be connected in series with the transmitter diode of the optoelectronically controllable AC switch U2, the zener voltage of which is at least equal to the voltage across the capacitor when the optocoupler switching transistor is controlled. This Zener voltage is added to the forward voltage of the transmitter diode of the optoelectronically controllable AC switch and prevents the control of this switch when the main thread is illuminated.

Gleiches gilt für das Schalten des Optokopplers U4 (Fig. 2) zum Ausgeben der Überwachungsmeldung. Auch dieser Optokoppler läßt sich vom Schalttransistor des Optokopplers U3 direkt steuern, indem dieser die Sendediode des Optokopplers U4 bedarfsweise kurzschließt oder deren Speisekreis auftrennt. Auch hier müssen ggf. gesonderte Vorkehrungen zum Unwirksammachen der bei durchgesteuertem Schalttransistor des Optokopplers U3 an dessen Schaltstrecke anstehenden Restspannung getroffen sein.The same applies to the switching of the optocoupler U4 (FIG. 2) to output the monitoring message. This optocoupler can also be controlled directly by the switching transistor of the optocoupler U3 by short-circuiting the transmitting diode of the optocoupler U4 if necessary or opening its supply circuit. Here, too, if necessary, separate precautions must be taken to render the residual voltage present at its switching path when the switching transistor of the optocoupler U3 is activated.

18 Patentansprüche
3 Figuren18 claims
3 figures

Claims (18)

Schaltung zur Funktionsüberwachung von Doppelfadenlampen in Lichtsignalen, insbesondere in Eisenbahn-Lichtsignalen, mit jeweils einem Haupt- und einem diesem parallelgeschalteten Nebenfaden, von denen bei angeschalteter Signallampe üblicherweise nur der Hauptfaden leuchtet, während der Nebenfaden dunkel bleibt und bei denen der Nebenfaden bei durchgebranntem zugehörigen Hauptfaden automatisch dessen Funktion übernimmt, unter Verwendung eines den jeweiligen Hauptfaden überwachenden Indikators, welcher bei über den Hauptfaden fließendem Lampenstrom die Anschaltung des zugehörigen Nebenfadens unterbindet und mit einem zusätzlichen Indikator zur Funktionskontrolle des Nebenfadens bei angeschaltetem intakten Hauptfaden,
dadurch gekennzeichnet,
daß mit dem Nebenfaden (NF) jeder Signallampe (L) ein Stromindikator (M) in Reihe geschaltet ist zum Auslösen einer Überwachungsmeldung und daß der Hauptfadenüberwacher (JH) mit von ihm gesteuerten Schaltmitteln (JH/1) diesen Stromindikator (M) bei einem zu niedrigen über den Hauptfaden fließenden Lampenstrom kurzschließt.Circuit for function monitoring of double-filament lamps in light signals, in particular in railway light signals, each with a main thread and a secondary thread connected in parallel, of which only the main thread lights up when the signal lamp is switched on, while the secondary thread remains dark and where the secondary thread remains when the associated main thread is burnt out automatically takes over its function, using an indicator monitoring the respective main thread, which prevents the associated auxiliary thread from being switched on when the lamp current flows over the main thread and with an additional indicator for checking the function of the auxiliary thread when the intact main thread is switched on,
characterized,
that with the secondary thread (NF) of each signal lamp (L) a current indicator (M) is connected in series to trigger a monitoring message and that the main thread monitor (JH) with switching means controlled by him (JH / 1) this current indicator (M) at one shorts low lamp current flowing over the main thread. Schaltung nach Anspruch 1, dadurch gekennzeichnet, daß der über den Stromindikator (M) des Nebenfadens (NF) geführte Speisekreis für den Nebenfaden so hochohmig ausgeführt ist, daß der Nebenfaden noch nicht aufleuchtet.Circuit according to Claim 1, characterized in that the feed circuit for the secondary thread, which is guided via the current indicator (M) of the secondary thread (NF), is so high-resistance that the secondary thread does not yet light up. Schaltung nach Anspruch 1 und/oder 2 , dadurch gekennzeichnet, daß die Indikatoren (JH und/oder M) als Relais ausgebildet sind.Circuit according to claim 1 and / or 2, characterized in that the indicators (JH and / or M) are designed as relays. Schaltung nach Anspruch 1 und/oder 2, dadurch gekennzeichnet, daß die Indikatoren (JH und/oder M) als Optokoppler (U1, U3) ausgebildet sind.Circuit according to Claim 1 and / or 2, characterized in that the indicators (JH and / or M) are designed as optocouplers (U1, U3). Schaltung nach Anspruch 4, dadurch gekennzeichnet, daß die Optokoppler (U1, U3) antiparallel geschaltete Sendedioden aufweisen.Circuit according to Claim 4 , characterized in that the optocouplers (U1, U3) have transmission diodes connected in anti-parallel. Schaltung nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß der mit dem Nebenfaden (NF) in Reihe geschaltete Optokoppler (U3) mit seinen Sendedioden parallel zu den vom Hauptfadenüberwacher (JH) gesteuerten Schaltmitteln (TR) geschaltet ist und daß der Schalttransistor dieses Optokopplers (U3) bei stromdurchflossenen Sendedioden unmittelbar oder mittelbar die Sendediode eines weiteren Optokopplers (U4), dessen Schalttransistor die Überwachungsmeldungen ausgibt, kurzschließt, den Speisekreis dieses Optokopplers (U4) auftrennt, den Kurzschluß aufhebt oder den Speisekreis schließt.Circuit according to Claim 4 or 5, characterized in that the optocoupler (U3) connected in series with the secondary thread (NF) is connected with its transmitting diodes in parallel with the switching means (TR) controlled by the main thread monitor (JH) and in that the switching transistor of this optocoupler ( U3) in the case of current-carrying transmit diodes, the transmitter diode of another optocoupler (U4), the switching transistor of which outputs the monitoring messages, short-circuits, disconnects the supply circuit of this optocoupler (U4), cancels the short circuit or closes the supply circuit. Schaltung nach Anspruch 6, dadurch gekennzeichnet, daß der Schalttransistor des mit dem Nebenfaden in Reihe geschalteten Optokopplers (U3) in eingestelltem Zustand einen elektronischen Schalter (S2) zum Schalten des weiteren Optokopplers (U4) einstellt.Circuit according to Claim 6, characterized in that the switching transistor of the optocoupler (U3) connected in series with the secondary thread sets an electronic switch (S2) for switching the further optocoupler (U4) in the set state. Schaltung nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß der Optokoppler (U1) des Hauptfadenüberwachers (JH) eingangsseitig an die Sekundärwicklung eines primärseitig in den Strompfad des Hauptfadens geschalteten Stromwandlers (T2) angeschlossen ist.Circuit according to Claim 4 or 5 , characterized in that the optocoupler (U1) of the main thread monitor (JH) is connected on the input side to the secondary winding of a current transformer (T2) connected on the primary side to the current path of the main thread. Schaltung nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß der Optokoppler des Hauptfadenüberwachers eingangsseitig einer in den Strompfad des Hauptfadens geschalteten Bürde parallelgeschaltet ist.Circuit according to Claim 4 or 5, characterized in that the optocoupler of the main thread monitor is connected in parallel on the input side to a load connected to the current path of the main thread. Schaltung nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß im Lampenkreis des Hauptfadens (HF) ein elektronischer Wechselstromschalter (TRH) angeordnet ist und daß der Optokoppler (U1) des Hauptfadenüberwachers (JH) eingangsseitig über den Hauptfaden der Signallampe (L) aus der Stromversorgungseinrichtung (T1) der Signallampe gespeist ist und im stromdurchflossenen Zustand den Hauptfaden-Wechselstromschalter (TRH) durchschaltet.Circuit according to claim 4 or 5, characterized in that an electronic AC switch (TRH) is arranged in the lamp circuit of the main thread (HF) and that the optocoupler (U1) of the main thread monitor (JH) on the input side via the main thread of the signal lamp (L) from the power supply device (T1) of the signal lamp is fed and switches through the main thread AC switch (TRH) in the current-carrying state. Schaltung nach Anspruch 6 oder 7 , dadurch gekennzeichnet, daß die Schalttransistoren der Optokoppler (U1, U3) an einer von der Lampenspannung der Signallampe abgeleiteten Gleichspannung liegen.Circuit according to Claim 6 or 7, characterized in that the switching transistors of the optocouplers (U1, U3) are connected to a direct voltage derived from the lamp voltage of the signal lamp. Schaltung nach den Ansprüchen 4 oder 5, 6, 8 oder 9, dadurch gekennzeichnet, daß die vom Hauptfadenüberwacher (JH) gesteuerten Schaltmittel als elektronischer Wechselstromschalter (TR) ausgeführt sind, der vom Optokoppler (U1) des Hauptfadenüberwachers unmittelbar oder mittelbar steuerbar ist.Circuit according to claims 4 or 5, 6, 8 or 9, characterized in that the switching means controlled by the main thread monitor (JH) are designed as an electronic AC switch (TR) which can be controlled directly or indirectly by the optocoupler (U1) of the main thread monitor. Schaltung nach Anspruch 12 , dadurch gekennzeichnet, daß der mit dem Nebenfaden in Reihe geschaltete elektronische Wechselstromschalter (TR) als Triac ausgebildet ist, der von einem ihm über Widerstände parallelgeschalteten optoelektronisch steuerbaren Wechselstromschalter (U2) steuerbar ist.Circuit according to Claim 12, characterized in that the electronic alternating current switch (TR) connected in series with the secondary thread is designed as a triac which can be controlled by an alternating current switch (U2) which can be optoelectronically controlled in parallel via resistors. Schaltung nach Anspruch l3, dadurch gekennzeichnet, daß der Schalttransistor des als Hauptfadenüberwacher verwendeten Optokopplers (U1) in eingestelltem Zustand einen elektronischen Schalter (S1) zum Kurzschließen der Sendediode oder Sendedioden des optoelektronisch steuerbaren Wechselstromschalters (U2) einstellt.Circuit according to Claim l3, characterized in that the switching transistor of the optocoupler (U1) used as the main thread monitor sets an electronic switch (S1) in the set state for short-circuiting the transmission diode or transmission diodes of the optoelectronically controllable AC switch (U2). Schaltung nach Anspruch 6 und/oder 13, dadurch gekennzeichnet, daß der Schaltstrecke des Optokoppler-Schalttransistors ein Kondensator parallelgeschaltet ist.Circuit according to Claim 6 and / or 13, characterized in that a capacitor is connected in parallel with the switching path of the optocoupler switching transistor. Schaltung nach Anspruch 6 und/oder 13 oder 15, dadurch gekennzeichnet, daß mit der mindestens einen Sendediode des optoelektronisch steuerbaren Wechselstromschalters (U2) eine Zenderdiode in Reihe geschaltet ist, deren Durchlaßspannung mindestens gleich der sich an der Schaltstrecke des eingestellten Optokoppler-Schalttransistors bzw. am Kondensator einstellenden Spannung ist.Circuit according to Claim 6 and / or 13 or 15, characterized in that with the at least one transmission diode of the optoelectronically controllable alternating current switch (U2) a sender diode is connected in series, the forward voltage of which is at least equal to that on the switching path of the set optocoupler switching transistor or voltage at the capacitor. Schaltung nach Anspruch 7 und/oder 14, dadurch gekennzeichnet, daß der elektronische Schalter (S1, S2) als Feldeffekt-Transistor ausgebildet ist.Circuit according to Claim 7 and / or 14, characterized in that the electronic switch (S1, S2) is designed as a field-effect transistor. Schaltung nach einem der Ansprüche 1 und 17, dadurch gekennzeichnet, daß mit der Sendediode des optoelektronisch steuerbaren Wechselsromschalters (U2), mit der Schaltstrecke des elektronischen Schalters (S1) oder mit der Schaltstrecke des ersten Optokoppler-Schalttransistors die Sendediode eines weiteren Optokopplers (U5) in Reihe geschaltet ist, dessen Schaltransistor zum Auslösen einer Überwachungsmeldung dient03Circuit according to one of claims 1 and 17, characterized in that with the transmitting diode of the optoelectronically controllable alternating current switch (U2), with the switching path of the electronic switch (S1) or with the switching path of the first optocoupler switching transistor, the transmitting diode of a further optocoupler (U5) is connected in series, whose switching transistor is used to trigger a monitoring message 03
EP90123329A 1989-12-14 1990-12-05 Failure detection circuit for multifilament lamps in signalling devices Expired - Lifetime EP0432623B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3941327A DE3941327A1 (en) 1989-12-14 1989-12-14 CIRCUIT FOR MONITORING THE FUNCTION OF DOUBLE-THREAD LAMPS IN LIGHT SIGNALS
DE3941327 1989-12-14

Publications (2)

Publication Number Publication Date
EP0432623A1 true EP0432623A1 (en) 1991-06-19
EP0432623B1 EP0432623B1 (en) 1994-06-15

Family

ID=6395469

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90123329A Expired - Lifetime EP0432623B1 (en) 1989-12-14 1990-12-05 Failure detection circuit for multifilament lamps in signalling devices

Country Status (6)

Country Link
EP (1) EP0432623B1 (en)
AT (1) ATE107462T1 (en)
DE (2) DE3941327A1 (en)
DK (1) DK0432623T3 (en)
ES (1) ES2056351T3 (en)
FI (1) FI97675C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112201537A (en) * 2020-10-12 2021-01-08 天津理工大学 Alternating current filament conversion relay and reliability online monitoring method thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19948718C2 (en) * 1999-09-30 2003-02-27 Siemens Ag Circuit for operating a luminous sign from a light signal circuit for signal lamps

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1181792B (en) * 1963-06-29 1964-11-19 Pintsch Bamag Ag Monitoring circuit for main and secondary threads of incandescent lamps, especially signal lamps
DE1566901A1 (en) * 1967-03-21 1970-04-30 Licentia Gmbh Arrangement for monitoring signal lamps for thread breakage
GB2011692A (en) * 1978-01-02 1979-07-11 Philips Nv Detecting an unwanted energisation combination of signal lamps in a traffic light circuit arrangement
US4380718A (en) * 1981-05-22 1983-04-19 Kelsey-Hayes Co. Trailer marker light substitution circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1181792B (en) * 1963-06-29 1964-11-19 Pintsch Bamag Ag Monitoring circuit for main and secondary threads of incandescent lamps, especially signal lamps
DE1566901A1 (en) * 1967-03-21 1970-04-30 Licentia Gmbh Arrangement for monitoring signal lamps for thread breakage
GB2011692A (en) * 1978-01-02 1979-07-11 Philips Nv Detecting an unwanted energisation combination of signal lamps in a traffic light circuit arrangement
US4380718A (en) * 1981-05-22 1983-04-19 Kelsey-Hayes Co. Trailer marker light substitution circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112201537A (en) * 2020-10-12 2021-01-08 天津理工大学 Alternating current filament conversion relay and reliability online monitoring method thereof
CN112201537B (en) * 2020-10-12 2023-10-03 天津理工大学 AC filament conversion relay and on-line monitoring method for reliability thereof

Also Published As

Publication number Publication date
FI906151A0 (en) 1990-12-13
ATE107462T1 (en) 1994-07-15
DE59006141D1 (en) 1994-07-21
EP0432623B1 (en) 1994-06-15
FI97675B (en) 1996-10-15
DE3941327A1 (en) 1991-06-20
DK0432623T3 (en) 1994-10-24
FI906151A (en) 1991-06-15
ES2056351T3 (en) 1994-10-01
FI97675C (en) 1997-01-27

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