EP0051854B1 - Failure-indicating circuit for a current load connected over an electronic switching device - Google Patents

Failure-indicating circuit for a current load connected over an electronic switching device Download PDF

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Publication number
EP0051854B1
EP0051854B1 EP81109507A EP81109507A EP0051854B1 EP 0051854 B1 EP0051854 B1 EP 0051854B1 EP 81109507 A EP81109507 A EP 81109507A EP 81109507 A EP81109507 A EP 81109507A EP 0051854 B1 EP0051854 B1 EP 0051854B1
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EP
European Patent Office
Prior art keywords
circuit according
input
switching device
electronic switching
control line
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Expired
Application number
EP81109507A
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German (de)
French (fr)
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EP0051854A1 (en
Inventor
G. Dr. Dipl-Ing. Domorazek
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Kabel Rheydt AG
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AEG Telefunken Kabelwerke AG
AEG Kabel 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection

Definitions

  • the invention relates to a circuit according to the preamble of claim 1.
  • the error message takes place via a separate line to a display device common to numerous electricity consumers.
  • the invention has for its object to reduce the number of lines leading to a control center.
  • an incandescent lamp through which the current of the control line flows serves as a display element, which lights up when the current in the control line assumes increased values in the event of a fault.
  • the PTC characteristic of the incandescent lamp its resistance increases at the same time and causes a current limitation.
  • the increase in the current in the control line results from a special arrangement and switching of the electronic switching device and not as a result of a targeted control of the impedance of the control line via an error signal.
  • the known circuit is therefore not of general use and only enables the detection of a limited number of types of errors.
  • the invention has the advantage that the error message is sent via the control line, so that no separate message lines are required.
  • the series resistor 5, the window discriminator 7 and the indicator lamp 8 are combined in a display device 9, which is located in the area of the control center.
  • the electronic switching device 1 is assigned fault detectors 10 and 11, of which the fault detector 10 supplies a signal to the OR gate 12 in the event of a short circuit in the consumer, the fault detector 11 in the event of an interruption in the consumer circuit.
  • the output signal of the OR gate 12 which arises in the event of an error causes the switch 13 to be closed, which is preferably designed as a controllable semiconductor, but could also be a make contact of a relay actuated by the output signal of the OR gate 12.
  • the switch 13 forms a controllable impedance, which changes its resistance value from "zero" (closed) to "infinite” (open), although it would also be possible in the sense of the invention, for. B. using a switching transistor to cause a change in resistance between a first value that is greater than zero and a second value that is greater than the first but finite.
  • the difference in resistance causes the input resistance of the electronic switching device 1 to assume a lower value in the event of a fault, so that because of the then increased voltage drop across the series resistor 5, the input voltage at the window discriminator is also noticeably reduced.
  • the window discriminator 7 is designed in such a way that the input voltage, which is noticeably lower than the value U z, emits an output current for actuating the indicator lamp 8, which thus indicates the existence of an error.
  • the window discriminator causes an error display when its input voltage is greater than U z when z. B. the control line is faulty interrupted.
  • a ground short of the control line would be indicated anyway by the indicator lamp 8 lighting up, because then the input voltage at the window discriminator 7 is less than Uzist.
  • the input resistance to be measured between control line 14 and ground can of course also be changed as a function of the error in that switch 13 or a switching transistor controlled by the output signal of OR gate 12 is arranged in series in the control circuit. However, the switch would then have to be opened in the event of a fault, so that a voltage which is greater than U z is at the window discriminator is present, which then causes the indicator lamp 8 to light up.
  • a qualitative evaluation of the voltage present on the control line 14 behind the resistor 5 by means of the window discriminator 7 enables a selective determination of various types of errors.
  • a special simple display device 15 is shown in FIG. 2, in which errors are indicated by a light-emitting diode 16 through which the current of the control line flows.
  • the display device 15 can be used in conjunction with the electronic switching device 1 shown in FIG. 1, but then the Zener diode 6 is not required.
  • the switch 13 When the switch 13 is open, that is to say if there is no fault, a small current flows in the control line 14, which does not light up the LED 16.
  • the current is particularly low when transistor 2 is a VMOS transistor. If, in the event of an error, the OR gate 12 causes the switch 13 to close, or if the control line is short-circuited to the ground, a higher current flows which causes the light-emitting diode 16 to light up. With a circuit according to FIG. 2, however, the interruption of the control line 14 is not indicated.
  • FIG. 3 An extended circuit for additional monitoring of the functionality of the brake light switch 4 'of a motor vehicle is shown in FIG. 3.
  • An OR gate 17 is located between the window discriminator 7 and the indicator lamp 8, as a result of which the error display explained at the outset is not influenced via the first input 18.
  • the second input 19 of the OR gate is connected to the output of an inverter 20, the input of which is connected on the one hand with high resistance (resistor 21) to the positive pole of the voltage source and on the other hand via a control switch 22 which can be actuated by the pressure of the brake fluid and via an AND provided for potential isolation -Gate 23 is connected to the connecting line between the switch 4 'and the resistor 5.
  • switch 4 When switch 4 'is open, this connecting line has ground potential, provided switch 22 is also open. At the input of the inverter there is an H signal which has been converted into an L signal at 19. The indicator lamp 8 is de-energized.
  • the brake switch 4 If the foot brake is pressed, the brake switch 4 'is closed. An H signal is present at AND gate 23. If the control switch 22 speaks after the build-up of the brake pressure in the master cylinder, there is an H signal at the input of the inverter 20 and an L signal at the input 19 of the OR gate 17, so that the display 8 remains de-energized.
  • the inverter 20 receives an L signal after the control switch 22 has responded. An H signal is then present at its output, as a result of which error lamp 8 responds.

Landscapes

  • Valves And Accessory Devices For Braking Systems (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Audible And Visible Signals (AREA)

Description

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

Bei einer durch die DE-A-2 203 428 bekannten derartigen Schaltung erfolgt die Fehlermeldung über eine gesonderte Leitung zu einer für zahlreiche Stromverbraucher gemeinsamen Anzeigeeinrichtung.In such a circuit known from DE-A-2 203 428, the error message takes place via a separate line to a display device common to numerous electricity consumers.

Wenn man eine Vielzahl von Stromverbrauchern, insbesondere bei einem Kraftfahrzeug, einzeln für sich überwachen will, muß eine große Anzahl von Leitungen zur Bedienungszentrale geführt werden, nämlich je Verbraucher eine Steuerleitung und eine Meldeleitung.If you want to monitor a large number of electricity consumers, especially in a motor vehicle, individually, a large number of lines must be led to the control center, namely one control line and one signal line for each consumer.

Der Erfindung liegt die Aufgabe zugrunde, die Anzahl der zu einer Bedienungszentrale zu führenden Leitungen zu verringern.The invention has for its object to reduce the number of lines leading to a control center.

Die Lösung gelingt durch die in Anspruch 1 gekennzeichneten Merkmale. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen gekennzeichnet.The solution is achieved by the features characterized in claim 1. Advantageous embodiments of the invention are characterized in the subclaims.

Bei einer durch die DE-A-2 649 034 bekannten derartigen Schaltung dient eine vom Strom der Steuerleitung durchflossene Glühlampe als Anzeigeelement, welches dann aufleuchtet, wenn im Fehlerfall der Strom in der Steuerleitung erhöhte Werte annimmt. Infolge der PTC-Charakteristik der Glühlampe erhöht sich gleichzeitig deren Widerstand und bewirkt eine Strombegrenzung. Die Erhöhung des Stroms in der Steuerleitung ergibt sich durch eine spezielle Anordnung und Schaltung der elektronischen Schalteinrichtung und nicht infolge einer gezielten Steuerung der Impedanz der Steuerleitung über ein Fehlermeldesignal. Die bekannte Schaltung ist deshalb nicht allgemein verwendbar und ermöglicht nur die Erfassung einer beschränkten Anzahl von Fehlerarten.In such a circuit known from DE-A-2 649 034, an incandescent lamp through which the current of the control line flows serves as a display element, which lights up when the current in the control line assumes increased values in the event of a fault. As a result of the PTC characteristic of the incandescent lamp, its resistance increases at the same time and causes a current limitation. The increase in the current in the control line results from a special arrangement and switching of the electronic switching device and not as a result of a targeted control of the impedance of the control line via an error signal. The known circuit is therefore not of general use and only enables the detection of a limited number of types of errors.

Durch die Erfindung ergibt sich der Vorteil, daß die Fehlermeldung über die Steuerleitung erfolgt, so daß keine gesonderten Meldeleitungen benötigt werden.The invention has the advantage that the error message is sent via the control line, so that no separate message lines are required.

Die Erfindung wird anhand von in der Zeichnung dargestellten vorteilhaften Schaltungsbeispielen erläutert.

  • Fig. 1 zeigt eine vereinfacht dargestellte erfindungsgemäße Schaltung mit einem als Anzeigelampe ausgebildetem Anzeigeelement.
  • Fig. 2 zeigt eine Abwandlung unter Verwendung einer Leuchtdiode als Anzeigeelement.
  • Fig. 3 zeigt eine Anzeigeeinrichtung, welche die Kontrolle des Bremslichtschalters eines Kraftfahrzeuges ermöglicht.
The invention is explained on the basis of advantageous circuit examples shown in the drawing.
  • Fig. 1 shows a simplified circuit according to the invention with a display element designed as an indicator lamp.
  • Fig. 2 shows a modification using a light emitting diode as a display element.
  • Fig. 3 shows a display device which enables the control of the brake light switch of a motor vehicle.

Mit 1 ist eine elektronische Schalteinrichtung bezeichnet, welche einen Schalttransistor 2 enthält, über welchen der mit dem Pluspol der Spannungsquelle verbundene Stromverbraucher 3 mit dem einen Minuspol gebildeten Massepotential verbunden ist. Wenn der in eine Bedienungszentrale befindliche Schalter 4 geschlossen ist, wird der Basis des Transistors 2 über einen Vorwiderstand 5 eine die Einschaltung des Stromverbrauchers bewirkende Steuerspannung zugeführt. Die Größe dieser Steuerspannung wird durch die Zehnerdiode 7 auf den Wert Uz festgelegt und ist gegenüber der Spannung U der Spannungsquelle um den Spannungsabfall am Vorwiderstand 5 verringert. Diese Spannung Uz liegt auch am Fensterdiskriminator 7 an, welcher jedoch bei diesem Wert keinen Strom durch das als Anzeigelampe 8 dargestellte Anzeigeelement durchläßt.1 designates an electronic switching device which contains a switching transistor 2, via which the current consumer 3 connected to the positive pole of the voltage source is connected to the ground potential formed by a negative pole. When the switch 4 located in an operating center is closed, the base of the transistor 2 is supplied with a control voltage which switches on the current consumer via a series resistor 5. The magnitude of this control voltage is determined by the tens diode 7 to the value U z and is reduced by the voltage drop across the series resistor 5 compared to the voltage U of the voltage source. This voltage U z is also present at the window discriminator 7, which, however, at this value does not pass any current through the display element shown as an indicator lamp 8.

Der Vorwiderstand 5, der Fensterdiskriminator 7 und die Anzeigelampe 8 sind in einer Anzeigeeinrichtung 9 zusammengefaßt, welche sich im Bereich der Bedienungszentrale befindet.The series resistor 5, the window discriminator 7 and the indicator lamp 8 are combined in a display device 9, which is located in the area of the control center.

Der elektronischen Schalteinrichtung 1 sind Fehlerdetektoren 10 und 11 zugeordnet, von denen der Fehlerdetektor 10 bei Verbraucherkurzschluß, der Fehlerdetektor 11 bei Unterbrechung des Verbraucherstromkreises dem ODER-Gatter 12 ein Signal zuführen. Das bei einem Fehler entstehende Ausgangssignal des ODER-Gatters 12 bewirkt ein Schließen des Schalters 13, welcher vorzugsweise als steuerbarer Halbleiter ausgebildet ist, jedoch auch ein Schließkontakt eines vom Ausgangssignal des ODER-Gatters 12 betätigten Relais sein könnte. Der Schalter 13 bildet eine steuerbare Impedanz, die ihren Widerstandswert von »Null« (geschlossen) auf »unendlich« (offen) ändert, wobei es jedoch ebenfalls im Sinne der Erfindung möglich wäre, z. B. bei Verwendung eines Schalttransistors eine Widerstandsänderung zwischen einem ersten Wert, der größer als Null ist, und einem zweiten Wert zu bewirken, welcher größer als der erste aber endlich ist.The electronic switching device 1 is assigned fault detectors 10 and 11, of which the fault detector 10 supplies a signal to the OR gate 12 in the event of a short circuit in the consumer, the fault detector 11 in the event of an interruption in the consumer circuit. The output signal of the OR gate 12 which arises in the event of an error causes the switch 13 to be closed, which is preferably designed as a controllable semiconductor, but could also be a make contact of a relay actuated by the output signal of the OR gate 12. The switch 13 forms a controllable impedance, which changes its resistance value from "zero" (closed) to "infinite" (open), although it would also be possible in the sense of the invention, for. B. using a switching transistor to cause a change in resistance between a first value that is greater than zero and a second value that is greater than the first but finite.

In jedem Falle bewirkt der Widerstandsunterschied, daß der Eingangswiderstand der elektronischen Schalteinrichtung 1 im Fehlerfall einen niedrigeren Wert annimmt, so daß wegen des dann erhöhten Spannungsabfalls am Vorwiderstand 5 auch die Eingangsspannung am Fensterdiskriminator merkbar verringert wird. Der Fensterdiskriminator 7 ist so ausgelegt, daß der bei gegenüber den Wert Uz merkbar verringerter Eingangsspannung einen Ausgangsstrom zur Betätigung der Anzeigelampe 8 abgibt, welche somit das Bestehen eines Fehlers anzeigt. Zusätzlich bewirkt der Fensterdiskriminator eine Fehleranzeige, wenn seine Eingangsspannung größer als Uz ist, wenn z. B. die Steuerleitung fehlerhaft unterbrochen ist.In any case, the difference in resistance causes the input resistance of the electronic switching device 1 to assume a lower value in the event of a fault, so that because of the then increased voltage drop across the series resistor 5, the input voltage at the window discriminator is also noticeably reduced. The window discriminator 7 is designed in such a way that the input voltage, which is noticeably lower than the value U z, emits an output current for actuating the indicator lamp 8, which thus indicates the existence of an error. In addition, the window discriminator causes an error display when its input voltage is greater than U z when z. B. the control line is faulty interrupted.

Ein Massekurzschluß der Steuerleitung würde ohnehin deshalb durch Aufleuchten der Anzeigelampe 8 angezeigt, weil dann die Eingangsspannung am Fensterdiskriminator 7 kleiner als Uzist.A ground short of the control line would be indicated anyway by the indicator lamp 8 lighting up, because then the input voltage at the window discriminator 7 is less than Uzist.

Der zwischen Steuerleitung 14 und Masse zu messende Eingangswiderstand kann selbstverständlich auch dadurch fehlerabhängig verändert werden, daß der Schalter 13 bzw. ein vom Ausgangssignal des ODER-Gatters 12 gesteuerter Schalttransistor in Reihenschaltung im Steuerkreis angeordnet ist. Allerdings müßte dann im Fehlerfall der Schalter geöffnet werden, so daß eine Spannung, die größer als Uz ist, am Fensterdiskriminator anliegt, welcher daraufhin ein Aufleuchten der Anzeigelampe 8 bewirkt.The input resistance to be measured between control line 14 and ground can of course also be changed as a function of the error in that switch 13 or a switching transistor controlled by the output signal of OR gate 12 is arranged in series in the control circuit. However, the switch would then have to be opened in the event of a fault, so that a voltage which is greater than U z is at the window discriminator is present, which then causes the indicator lamp 8 to light up.

Durch eine qualitative Auswertung der an der Steuerleitung 14 hinter dem Widerstand 5 anliegenden Spannung mittels des Fensterdiskriminators 7 ist eine selektive Ermittlung verschiedener Fehlerarten möglich.A qualitative evaluation of the voltage present on the control line 14 behind the resistor 5 by means of the window discriminator 7 enables a selective determination of various types of errors.

Eine besondere einfache Anzeigeeinrichtung 15 ist in Fig.2 dargestellt, bei welcher Fehler durch eine direkt vom Strom der Steuerleitung durchflossene Leuchtdiode 16 angezeigt werden. Die Anzeigeeinrichtung 15 kann in Verbindung mit der in Fig. 1 dargestellten elektronischen Schalteinrichtung 1 verwendet werden, wobei dann aber die Zenerdiode 6 nicht erforderlich ist.A special simple display device 15 is shown in FIG. 2, in which errors are indicated by a light-emitting diode 16 through which the current of the control line flows. The display device 15 can be used in conjunction with the electronic switching device 1 shown in FIG. 1, but then the Zener diode 6 is not required.

Bei geöffnetem Schalter 13, falls also kein Fehler vorhanden ist, fließt in der Steuerleitung 14 ein geringer Strom, welcher die Leuchtdiode 16 nicht zum Aufleuchten bringt. Der Strom ist besonders gering, wenn der Transistor 2 ein VMOS-Transistor ist. Wenn bei einem Fehler das ODER-Gatter 12 die Schließung des Schalters 13 bewirkt, oder wenn ein Massekurzschluß der Steuerleitung vorliegt, fließt ein höherer, das Aufleuchten der Leuchtdiode 16 bewirkender Strom. Mit einer Schaltung nach Fig. 2 wird allerdings nicht die Unterbrechung der Steuerleitung 14 angezeigt.When the switch 13 is open, that is to say if there is no fault, a small current flows in the control line 14, which does not light up the LED 16. The current is particularly low when transistor 2 is a VMOS transistor. If, in the event of an error, the OR gate 12 causes the switch 13 to close, or if the control line is short-circuited to the ground, a higher current flows which causes the light-emitting diode 16 to light up. With a circuit according to FIG. 2, however, the interruption of the control line 14 is not indicated.

Eine erweiterte Schaltung zur zusätzlichen Überwachung der Funktionsfähigkeit des Bremslichtschalters 4' eines Kraftfahrzeuges ist in Fig. 3 dargestellt.An extended circuit for additional monitoring of the functionality of the brake light switch 4 'of a motor vehicle is shown in FIG. 3.

Zwischen dem Fensterdiskriminator 7 und der Anzeigelampe 8 befindet sich ein ODER-Gatter 17, wodurch die eingangs erläuterte Fehleranzeige über den ersten Eingang 18 nicht beeinflußt wird. Der zweite Eingang 19 des ODER-Gatters ist mit dem Ausgang eines Inverters 20 verbunden, dessen Eingang einerseits hochohmig (Widerstand 21) mit dem Pluspol der Spannungsquelle verbunden ist und andererseits über einen vom Druck der Bremsflüssigkeit betätigbaren Kontrollschalter 22 und über ein zur Potentialtrennung vorgesehenes UND-Gatter 23 an die zwischen dem Schalter 4' und dem Widerstand 5 liegende Verbindungsleitung angeschlossen ist.An OR gate 17 is located between the window discriminator 7 and the indicator lamp 8, as a result of which the error display explained at the outset is not influenced via the first input 18. The second input 19 of the OR gate is connected to the output of an inverter 20, the input of which is connected on the one hand with high resistance (resistor 21) to the positive pole of the voltage source and on the other hand via a control switch 22 which can be actuated by the pressure of the brake fluid and via an AND provided for potential isolation -Gate 23 is connected to the connecting line between the switch 4 'and the resistor 5.

Bei geöffnetem Schalter 4' hat diese Verbindungsleitung Massepotential, sofern auch der Schalter 22 geöffnet ist. Am Eingang des Inverters liegt ein H-Signal, welches zu einem L-Signal an 19 umgeformt wurde. Die Anzeigelampe 8 ist stromlos.When switch 4 'is open, this connecting line has ground potential, provided switch 22 is also open. At the input of the inverter there is an H signal which has been converted into an L signal at 19. The indicator lamp 8 is de-energized.

Wird die Fußbremse gedrückt, wird der Bremsschalter4' geschlossen. An UND-Gatter 23 liegt ein H-Signal an. Spricht nach dem Aufbau des Bremsdruckes im Hauptbremszylinder der Kontrollschalter 22 an, liegt am Eingang des Inverters 20 ein H-Signal und am Eingang 19 des ODER-Gatters 17 ein L-Signal, so daß die Anzeige 8 weiterhin stromlos bleibt.If the foot brake is pressed, the brake switch 4 'is closed. An H signal is present at AND gate 23. If the control switch 22 speaks after the build-up of the brake pressure in the master cylinder, there is an H signal at the input of the inverter 20 and an L signal at the input 19 of the OR gate 17, so that the display 8 remains de-energized.

Wird nach Betätigung der Fußbremse der Schalter 4' z. B. infolge eines unrichtig einjustierten Gestänges nicht geschlossen, so erhält nach Ansprechen des Kontrollschalters 22 der Inverter 20 ein L-Signal. An seinen Ausgang liegt dann ein H-Signal, wodurch die Fehlerlampe 8 anspricht.Is the switch 4 'z. B. not closed due to an incorrectly adjusted linkage, the inverter 20 receives an L signal after the control switch 22 has responded. An H signal is then present at its output, as a result of which error lamp 8 responds.

Ein Fehler wird auch angezeigt, wenn der Schalter 4' verspätet erst nach dem Aufbau des Bremsdruckes und nach dem Schließen des Kontrollschalters 22 geschlossen wird. Da in diesem Fall die Anzeigelampe 8 nur kurz aufleuchten würde, ist es sinnvoll, das Fehlersignal mit Hilfe einer Speicherzelle 24 für eine bestimmte Zeit abzuspeichern.An error is also indicated if the switch 4 'is closed late only after the brake pressure has been built up and after the control switch 22 has been closed. Since in this case the indicator lamp 8 would only light up briefly, it makes sense to store the error signal for a certain time using a memory cell 24.

Claims (15)

1. Circuit for reporting a fault in a current consumer (3) connected via an electronic switching device (1) by means of an indicating device (9, 15), with a control signal initiating the switching- on of the current consumer (3) being feedable to the input of the electronic switching device (1) via a control line, and with fault detectors (10, 11) being provided to deliver in the event of faulty behavior in the output circuit of the switching device (1) a fault reporting signal by means of which a fault indication is initiated, characterized in that the fault reporting signal is connected to the control input of a controllable impedance (13) altering the input resistance of the electronic switching device (1), and in that the indicating device (9, 15) is connected in parallel or in series with the input resistance and is so designed that it delivers a fault indication at a certain current caused by the controlled alteration of the input resistance in the control line (14).
2. Circuit according to claim 1, characterized in that an ohmic series resistance is connected into the control line (14).
3. Circuit according to claims 1 or 2, characterized in that the controlled impedance (13) is connected in parallel with the input of the electronic switching device (1).
4. Circuit according to claims 1 or 2, characterized in that the controlled impedance (13) is connected in series with the control line (14) of the electronic switching device (1).
5. Circuit according to one of claims 1 to 4, characterized in that the controlled impedance (13) is a controllable semiconductor.
6. Circuit according to one of claims 1 to 5, characterized in that the input stage of the electronic switching device (1) is constituted by a transistor (2).
7. Circuit according to claim 6, characterized in that the transistor (2) is a VMOS transistor.
8. Circuit according to one of claims 1 to 7, characterized in that the indicating element is a light emitting diode (16).
9. Circuit according to claim 7, characterized in that current in the control line (14) flows through the light emitting diode (16).
10. Circuit according to one of claims 2 to 8, characterized in that the indicating device (9) is actuatable by a voltage reduced by the amount of the voltage drop of the series resistance (5).
11. Circuit according to one of claims 1 to 10, characterized in that the indicating element (8) is preceded by a window discriminator (7).
12. Circuit according to claims 10 or 11, characterized in that a zener diode (6) is connected in parallel with the input of the electronic switching device (1).
13. Circuit according to one of claims 1 to 12, characterized in that the indicating element (8) is preceded by an OR gate (17) via whose second input (19) there can be fed a second reporting signal which actuates the indicating element (8) and which is present in the event of faulty non-closure of the switch (4,4') initiating the switching-on of the current consumer.
14. Circuit according to claim 13, characterized in that there is provided for controlling the brake light switch (4') of a motor vehicle, a control switch (22) which is actuatable by the pressure of the brake fluid and by whose response in the event of non-closure of the brake light switch (4'), a reporting signal occurs at the second input (19) of the OR gate (17).
15. Circuit according to one of claims 13 or 14, characterized in that the second input (19) of the OR gate (17) is preceded by an inverter (20) whose input is connected, on the one hand, via a resistance (21) in front of the brake light switch (4') to the positive pole of the voltage source and, on the other hand, behind the brake light switch (4') via the control switch (22) and a potential divider (23) to the potential of the control line (14).
EP81109507A 1980-11-11 1981-11-04 Failure-indicating circuit for a current load connected over an electronic switching device Expired EP0051854B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3042415A DE3042415C2 (en) 1980-11-11 1980-11-11 Circuit for error messages in the case of a power consumer switched via an electronic switching device
DE3042415 1980-11-11

Publications (2)

Publication Number Publication Date
EP0051854A1 EP0051854A1 (en) 1982-05-19
EP0051854B1 true EP0051854B1 (en) 1985-10-02

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EP81109507A Expired EP0051854B1 (en) 1980-11-11 1981-11-04 Failure-indicating circuit for a current load connected over an electronic switching device

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US (1) US4584555A (en)
EP (1) EP0051854B1 (en)
JP (1) JPH023469B2 (en)
DE (2) DE3042415C2 (en)
WO (1) WO1982001801A1 (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3313712A1 (en) * 1983-04-15 1984-10-18 AEG-Telefunken Kabelwerke AG, Rheydt, 4050 Mönchengladbach CIRCUIT FOR ERROR MESSAGE FOR A POWER CONSUMER SWITCHED BY A CONTROLLABLE SWITCHING DEVICE
US4654645A (en) * 1984-09-22 1987-03-31 Sharp Kabushiki Kaisha Electric element breakdown detector
DE3815604A1 (en) * 1988-05-06 1989-11-23 Texas Instruments Deutschland DRIVER CIRCUIT
FR2633140B1 (en) * 1988-06-15 1996-04-26 Forclum Force Lumiere Elect METHOD AND SYSTEM FOR MONITORING FAILURES OF AT LEAST ONE LIGHT SOURCE
US4884034A (en) * 1989-01-03 1989-11-28 Hermilo Guzman Ground fault detector and locator
GB2228091B (en) * 1989-02-08 1992-09-23 Westinghouse Brake & Signal Current monitoring
US4970508A (en) * 1989-06-05 1990-11-13 Webster Iii Daniel T System for monitoring switch locations
US5124616A (en) * 1990-11-05 1992-06-23 Motorola, Inc. Circuit for driving a load and for producing a signal indicative of the condition of the load
DE10107578A1 (en) 2001-02-17 2002-08-29 Hella Kg Hueck & Co Lighting system for motor vehicles
GB0204836D0 (en) * 2002-03-01 2002-04-17 Tapeswitch Ltd Lamp monitor and lamp
DE102004045435B4 (en) * 2004-09-18 2008-07-31 Man Nutzfahrzeuge Ag Monitoring the function of incandescent or LED lights in motor vehicles
US7301447B2 (en) * 2005-04-13 2007-11-27 Gm Global Technology Operations, Inc. LED turn signal and error detecting method
US9705337B2 (en) * 2015-09-28 2017-07-11 Juniper Networks, Inc. Mitigating an effect of a downstream failure in an automatic transfer switching system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2203426A1 (en) * 1971-01-28 1972-08-17 Nippon Denso Co Lamp failure detection system

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1009433A (en) * 1961-11-21 1965-11-10 Reginald Thomas Hamilton Improvements relating to hydraulic braking systems
DE1605970C2 (en) * 1967-09-07 1974-08-15 Girling Ltd., Tyseley, Birmingham (Grossbritannien) Warning system for a pressure medium-actuated motor vehicle brake system
US3591832A (en) * 1970-05-18 1971-07-06 Siemens Ag Electronic overload protection circuits
US3654518A (en) * 1970-09-17 1972-04-04 Caterpillar Tractor Co Fast acting solid state circuit breaker
GB1287074A (en) * 1971-01-28 1972-08-31 Ford Motor Co Electrical wiring harness
DE2352496C3 (en) * 1973-10-19 1981-08-13 Robert Bosch Gmbh, 7000 Stuttgart Control device for train sets in which at least the train car is provided with an anti-lock control system
DE2415157A1 (en) 1974-03-29 1975-10-09 Bosch Elektronik Gmbh Switching and delay device - delivers two output voltages, depending on input signal being below or above threshold
US3937987A (en) 1974-04-11 1976-02-10 Rca Corporation Threshold detector
DE2519752B1 (en) * 1975-05-02 1976-08-12 Konstantin Zarkadas Monitoring circuit for electrical devices in motor vehicles - control voltage generator has protective gas contact surrounded by coil
DE2649034C2 (en) * 1976-10-28 1985-01-24 Kabelwerke Reinshagen Gmbh, 5600 Wuppertal Circuit arrangement for a cable set and its use in a motor vehicle
DE2741054A1 (en) 1977-03-30 1979-03-22 Riba Jutta Monitoring circuit for incandescent lamps on vehicle - measures volts across resistor in series with lamp and operates optical indicator
GB1592167A (en) 1978-01-04 1981-07-01 Transport Secretary Of State F Apparatus for monitoring signal lamps
DD135021A1 (en) * 1978-03-17 1979-04-04 Guenter Turinsky threshold
DE2842629C2 (en) * 1978-09-29 1980-07-17 Siemens Ag, 1000 Berlin Und 88000 Muenchen Device for the controllable connection of a connection point via a load resistor to a load potential
DE2854313C2 (en) * 1978-12-15 1980-08-14 Siemens Ag, 1000 Berlin Und 8000 Muenchen Overload protection arrangement for switching transistors
FR2452229A1 (en) 1979-03-19 1980-10-17 Jaeger VEHICLE STOP LIGHT FAULT DETECTOR
FR2482800A1 (en) * 1980-05-14 1981-11-20 Thomson Csf Mat Tel Transistor power amplifier overload protector - is integrable on same substrate and consists of input shunting transistor switched by AND=gate connected to output and inverted input

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2203426A1 (en) * 1971-01-28 1972-08-17 Nippon Denso Co Lamp failure detection system

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US4584555A (en) 1986-04-22
DE3172547D1 (en) 1985-11-07
DE3042415C2 (en) 1990-08-02
WO1982001801A1 (en) 1982-05-27
JPH023469B2 (en) 1990-01-23
DE3042415A1 (en) 1982-07-29
JPS57501976A (en) 1982-11-04
EP0051854A1 (en) 1982-05-19

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