EP0002504B1 - Circuit de surveillance des signaux dans des dispositifs de signalisation lumineux - Google Patents
Circuit de surveillance des signaux dans des dispositifs de signalisation lumineux Download PDFInfo
- Publication number
- EP0002504B1 EP0002504B1 EP19780101602 EP78101602A EP0002504B1 EP 0002504 B1 EP0002504 B1 EP 0002504B1 EP 19780101602 EP19780101602 EP 19780101602 EP 78101602 A EP78101602 A EP 78101602A EP 0002504 B1 EP0002504 B1 EP 0002504B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- voltage
- lamp
- signal
- test voltage
- transformer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Images
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/097—Supervising of traffic control systems, e.g. by giving an alarm if two crossing streets have green light simultaneously
Definitions
- the invention relates to a circuit arrangement for signal protection in light signal systems, a transformer being switched on in the lamp circuit in parallel with the lamp switch, on the secondary side of which a test voltage proportional to the difference between the mains voltage and the lamp voltage can be tapped and via logic circuits with the test voltage from a other lamp circuit is comparable.
- a transformer is looped into the circuit of the relevant signal lamp in series with the lamp switch.
- a test voltage only arises when the lamp switch is closed, i.e. the lamp is switched on.
- the high-resistance primary winding of the transformer could also be arranged parallel to the lamp switch for monitoring the release lamps. In this case, a test voltage only results when the lamp switch is open, since when the lamp is switched on, the transformer is short-circuited by the lamp switch.
- This latter arrangement thus checks whether the lamp switch is closed; a test voltage is only given when the switch is open. A short circuit via the lamp switch is also recognized. However, if there is a high-impedance cable connection between the lamp switch and the lamp, through which, for example, a third of the mains voltage is applied to the lamp, this is not recognized in the known circuits, because the transformer continues to detect a voltage, albeit lower, at the lamp switch and delivers a test voltage accordingly. At the same time, however, a third of the mains voltage can cause a release lamp to light up so strongly that it is interpreted by the road users as a release signal and can lead to dangerous traffic situations.
- the object of the invention is to improve a circuit arrangement for signal protection of the type mentioned at the outset in such a way that an incorrect voltage on a signal lamp can be detected and evaluated even at a minimum value to be determined.
- this object is achieved in a circuit arrangement of the type mentioned at the outset in that the rectifier arrangement on the secondary side of the transformer is followed by a threshold switch which only passes the test voltage on to the output when a predetermined setpoint is exceeded.
- the circuit arrangement according to the invention determines when the voltage across the lamp itself, for example due to a high-resistance cable connection, exceeds a value which makes it possible to detect that the lamp is lit. In this case, the test voltage is no longer switched through to the output. This takes advantage of the fact that as the lamp voltage rises, the voltage at the transformer or at the lamp switch becomes lower as a difference to the mains voltage.
- the test circuit is completely independent of its own power supply, since it only works with the voltage in the lamp circuit.
- a zener diode can be provided as the threshold switch, which ignites a thyristor tetrode via a transistor, which then switches the test voltage on to the output.
- a capacitor is expediently provided in parallel with the base-emitter path of the transistor, which controls the transistor beyond the zero crossing. In this case, the thyristor tetrode also remains switched on beyond the zero crossing, so that the test signal is constantly present at the output as long as the peak value of the test voltage does not fall below the setpoint.
- FIG. 1 shows on the right a normal lamp circuit for a signal lamp SL, for example the green lamp of a traffic signal generator.
- the AC line voltage of, for example, 220 V is switched on to the signal lamp SL via a lamp switch LS, which can also be a triac.
- the high-resistance primary winding of a transformer TR is parallel to the lamp switch LS. As long as the lamp switch LS is open, flows through the primary winding of the transformer TR and over the negligible cold resistance of the signal lamp SL such a low current that the lamp does not light up. Almost the entire mains voltage is present at the transformer TR.
- test voltage Up is tapped via the secondary winding of the transformer TR and via the rectifier arrangement GR, which is proportional to the voltage at the primary winding of the transformer TR.
- this test voltage Up is evaluated as a signal that the lamp switch is open and the signal lamp SL is not burning.
- a low voltage can be applied to the lamp, which already lights up the signal lamp at a third of the mains voltage (70 V).
- the voltage at the transformer TR is thereby reduced by a third, but a test voltage Up still appears at the output of the rectifier arrangement GR.
- the lamp switch is therefore still opened and the signal lamp SL is reported as de-energized.
- the safety logic does not recognize from the reduced test voltage that there is an incorrect voltage at the signal lamp SL.
- the test voltage Up is not directly fed to the output A and thus to the test logic. Rather, the test voltage Up is applied to the Zener diode D1.
- This Zener diode D1 is chosen so high that it can only be reached by the test voltage Up when there are no appreciable fault voltages on the signal lamp SL. As soon as the signal lamp SL lights up weakly due to an incorrect voltage, the voltage difference between the mains voltage and the error voltage applied to the transformer TR is reduced so much that the test voltage Up can no longer switch through the Zener diode D1.
- the course of the test voltage Up is shown in FIG. 2. It is assumed that with a mains voltage of 220 V secondary, after the rectifier arrangement GR, an unscreened DC voltage with a peak value of +17 V is produced as the test voltage.
- the zener diode has, for example, a breakdown voltage of +11 V. If the amplitude of the test voltage Up now reaches a voltage value greater than + 11 V (in FIG. 2, point X), the zener diode D1 becomes conductive. As a result, the capacitor C is charged and the transistor T1 is turned on via the resistor R2.
- the control electrode GA of the thyristor tetrode T5 is driven via the conductive transistor T1 and the resistor R1, and the anode-cathode path of T5 becomes low-resistance.
- the thyristor tetrode T5 remains low-resistance until the anode current becomes zero; only then must a new control take place.
- the Zener diode D1 blocks. Now, however, the capacitor C charged during the time t1 (FIG. 2) is discharged via the resistor R2 and the base-emitter path from T1 (time t2). In this case, the transistor T1 is turned on beyond the zero crossing of Up. As a result, the thyristor tetrode T5 remains open until the next zero crossing.
- the resistor R4 serves to limit the current
- the Zener diode D2 serves to limit the voltage.
- a transistor logic is connected downstream of output A, which is not shown in detail since it corresponds to the known prior art. Such logic is shown, for example, in DT-AS 20 42 573.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Claims (3)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19772756493 DE2756493C2 (de) | 1977-12-19 | 1977-12-19 | Schaltungsanordnung zur Signalsicherung in Lichtsignalanlagen |
DE2756493 | 1977-12-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0002504A1 EP0002504A1 (fr) | 1979-06-27 |
EP0002504B1 true EP0002504B1 (fr) | 1980-11-26 |
Family
ID=6026511
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19780101602 Expired EP0002504B1 (fr) | 1977-12-19 | 1978-12-07 | Circuit de surveillance des signaux dans des dispositifs de signalisation lumineux |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0002504B1 (fr) |
AT (1) | AT374023B (fr) |
DE (1) | DE2756493C2 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3206345A1 (de) * | 1982-02-22 | 1983-09-01 | Siemens AG, 1000 Berlin und 8000 München | Lichtsignalanlage, insbesondere verkehrssignalanlage |
DE3541549A1 (de) * | 1985-11-25 | 1987-05-27 | Stuehrenberg Rolf | Verfahren und vorrichtung zur signalsicherung in lichtzeichenanlagen |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1194295B (de) * | 1962-05-21 | 1965-06-03 | Franz Baumgartner Fabrik Elek | Lichtelektrisches Kontrollsystem fuer Signallampen in Verkehrssignalanlagen |
DE1303440B (fr) * | 1964-11-21 | 1971-12-02 | Franz Baumgartner Fabrik Elektrischer Apparate | |
US3648233A (en) * | 1968-07-03 | 1972-03-07 | Gulf & Western Industries | Load control error detector |
DE1944996A1 (de) * | 1969-09-05 | 1971-03-11 | Siemens Ag | Meldelampenschaltung mit UEberwachungsstromkreis |
DE2042573C3 (de) * | 1970-08-27 | 1974-12-19 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Überwachungseinrichtung für ohmsche Verbraucher an Wechselspannung, vorzugsweise Signallampen für den Straßenverkehr |
US3706983A (en) * | 1971-01-18 | 1972-12-19 | Buckbee Mears Co | Lamp circuit |
-
1977
- 1977-12-19 DE DE19772756493 patent/DE2756493C2/de not_active Expired
-
1978
- 1978-12-07 EP EP19780101602 patent/EP0002504B1/fr not_active Expired
- 1978-12-18 AT AT902178A patent/AT374023B/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE2756493A1 (de) | 1979-06-21 |
EP0002504A1 (fr) | 1979-06-27 |
ATA902178A (de) | 1983-07-15 |
DE2756493C2 (de) | 1987-03-19 |
AT374023B (de) | 1984-03-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0060992A2 (fr) | Maquette d'essai et circuit d'évaluation pour détecteur de proximité à commande de machines | |
DE3347458C2 (fr) | ||
DE3049741C2 (de) | Einrichtung zur Versorgung und zur Überwachung des richtigen Arbeitens eines Eisenbahnsignals | |
EP0172454B1 (fr) | Dispositif de contrôle pour installations de feux de signalisation | |
EP0002504B1 (fr) | Circuit de surveillance des signaux dans des dispositifs de signalisation lumineux | |
DE1673960A1 (de) | Schaltungsanordnung zur UEberwachung eines physikalischen Zustandes | |
DE3531001A1 (de) | Ueberwachungseinrichtung fuer niederspannungssignallampen | |
DE19532677B4 (de) | Überwachungsschaltung für wenigstens eine Versorgungsspannung | |
DE1810707C3 (de) | Einrichtung zur Schalterstellungsanzeige in elektrischen Schaltanlagen | |
DE2809993C3 (de) | Flammenwächterschaltung zur Überwachung einer Brennerflamme | |
CH663077A5 (de) | Selbstueberwachender flammenwaechter. | |
DE955070C (de) | Schutzschaltung fuer elektrische Verbraucheranlagen, insbesondere Beleuchtungsanlagen in Untertagebetrieben | |
DE2457807C3 (de) | Einrichtung zur Umschaltung eines Stufentransformators mittels Halbleiter-Wechselstromsteller | |
DE3101967C2 (de) | Eigensicherer Flammenwächter | |
EP0258214B1 (fr) | Agencement de controle de consommateurs d'electricite dans des vehicules a moteur | |
DE1907057C3 (de) | Schaltungsanordnung zum Überwachen einer durch einen Blinkgeber getasteten, wechselstromgespeisten Signallampenstromkreises für Eisenbahnsicherungsanlagen | |
DE4143097C3 (de) | Anordnung und Anzeige zur Ortsbestimmung defekter Lampen in Flugplatzbefeuerungsanlagen mit digitalem Lampen-"Intakt"-Signal | |
DE3107090C2 (fr) | ||
DE3434474C2 (de) | Schaltungsanordnung zur Geschwindigkeitsüberwachung für zumindest einen Motor | |
DE2002325C (de) | Überstrom-Schutzschaltung für eine im Normalbetrieb einen kapazitiven Reihenschwingkreis speisende Wechselrichter- | |
DE1933942C (de) | Anordnung zur elektronischen Über wachung der Sicherungselemente von paral lelgeschalteten Verbraucherstromkreisen | |
DE2832149C2 (de) | Schaltungsanordnung für ein Gerät zur elektrischen Betäubung eines Tieres | |
EP0404143A1 (fr) | Circuit pour surveiller des charges à courant alternatif dans des installations de chemin de fer | |
DE2826863B2 (de) | Fahrtrichtungsanzeigeanordnung für ein Zweirad-Kraftfahrzeug | |
DE3117188C2 (de) | Schaltungsanordnung zur Überwachung von Lichtsignalstromkreisen in Eisenbahnanlagen |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): CH FR NL SE |
|
17P | Request for examination filed | ||
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Designated state(s): CH FR NL SE |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19841220 Year of fee payment: 7 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19841231 Year of fee payment: 7 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19861231 Year of fee payment: 9 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19871208 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19880701 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19880831 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 19910322 Year of fee payment: 13 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CH Effective date: 19911231 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
EUG | Se: european patent has lapsed |
Ref document number: 78101602.7 Effective date: 19880912 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |