WO1988001108A1 - Driving circuit for an electric consumer - Google Patents

Driving circuit for an electric consumer Download PDF

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Publication number
WO1988001108A1
WO1988001108A1 PCT/DE1987/000319 DE8700319W WO8801108A1 WO 1988001108 A1 WO1988001108 A1 WO 1988001108A1 DE 8700319 W DE8700319 W DE 8700319W WO 8801108 A1 WO8801108 A1 WO 8801108A1
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WO
WIPO (PCT)
Prior art keywords
connection
transistor
current
base
electrical consumer
Prior art date
Application number
PCT/DE1987/000319
Other languages
German (de)
French (fr)
Inventor
Ralph Renk
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO1988001108A1 publication Critical patent/WO1988001108A1/en

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
    • H03K17/0826—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in bipolar transistor switches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications

Definitions

  • Circuit arrangement for controlling an electrical consumer
  • the circuit arrangement according to the invention for controlling an electrical consumer with the features of the main claim has the advantage over the prior art that the current control element connected in series with the electrical consumer only has to be designed for normal operating conditions with regard to its load capacity, since in the event of a fault a complete shutdown of Current control member takes place so that no increased power loss has to be dissipated in the current control member itself.
  • the current control element can therefore also be dimensioned much smaller in terms of construction, which, apart from the price advantage, also benefits from a denser packing of the electronic components.
  • FIG. 1 shows a circuit diagram of the circuit arrangement
  • FIG. 2 shows a state table of parts of the circuit arrangement
  • FIG. 3 signal forms at selected points in the circuit diagram.
  • the exemplary embodiment is a circuit arrangement for controlling an electrical consumer, such as an electromagnetic relay or actuator, in particular for performing switching functions in connection with an internal combustion engine.
  • 10 denotes a control circuit, for example a microprocessor, via the output connection 11 of which control signals with the logic level H or L are emitted.
  • 20 denotes an electrical consumer, one connection of which is connected to the operating voltage UB.
  • a current control element is connected in series to the electrical consumer 20. This is a transistor T2, which with its collector connection is connected to the electrical consumer 20 and its emitter connection is connected to ground via a resistor R5.
  • the base connection of the transistor T2 is connected to the tap of a voltage divider consisting of the resistors R3 and R4, the base of which is connected to ground and the high point of which is connected to the collector connection of a further transistor T1, the base connection of which is connected via the resistor R1 to the output connection 11 Control circuit 10 and on the other hand is connected via resistor R2 to its emitter terminal, which in turn is connected to the operating voltage VGG.
  • T3 denotes a second current control element (transistor), the collector connection of which is led to the tap of the voltage divider R3, R4 and the emitter connection of which is connected to ground.
  • the base terminal of the transistor T3 is connected to the tap of a further voltage divider R6, R7, the base of which is at ground and the high point of which is led to the collector terminal of the first current control element, namely the transistor T2.
  • the collector terminal of a further transistor T4 is connected to the base terminal of transistor T3, the emitter terminal of which is connected to ground and the base terminal of which is connected to the output terminal 11 of the control circuit 10 via the resistor R8.
  • the current control elements T2 and T3 together form a bistable multivibrator which in its first switching state enables current to flow through the electrical consumer 20 and which in its second switching state (blocking state) blocks the current flow through the electromagnetic consumer 20.
  • the functioning of the circuit arrangement can be described as follows. If the current I exceeds a predeterminable threshold value in the conductive state of T2, T3 is controlled into the conductive state and in turn blocks the first current control element T2. The blocking state of the bistable multivibrator is thus assumed, in which current no longer flows through the electrical consumer 20. This is a stable state in which no power loss has to be dissipated by the current control elements, in particular by T2. A current which may still flow through R6 in the blocking state is negligible and does not generate any significant power loss.
  • the response threshold for the overturning of the bistable multivibrator into the blocking state and thus the maximum permissible current limit value for the electrical consumer 20 can be set in a simple manner by suitable dimensioning of the resistor R5 in the emitter line of the transistor T2 and the resistance ratio of the voltage divider R6, R7.
  • Transistor T4 enables the bistable multivibrator T2, T3 to be reset from the blocking state to the operating state. If after. If a fault situation occurs and its elimination at the output terminal 11 of the control circuit 10, a signal with the logic level H is emitted, transistor T4 blocks transistor T3.
  • Transistor T2 remains switched off, but can be controlled again in a regular manner via transistor T1 by the next edge of the signal with logic level L at output terminal 11 of control circuit 10. If the fault situation persists (eg short-circuit of the electrical consumer 20 or an impermissibly high current flow), the protective mechanism comes into force again as described above by tilting the bistable circuit into the locked state.
  • the state diagram according to FIG. 2 explains the switching states at the output terminal 11 of the control circuit 10 at the first current control element T2 and at the electrical consumer 20.
  • FIG. 3 shows characteristic waveforms as a function of time at selected points in the circuit diagram, on the one hand for regular operation and, on the other hand, for a fault which is assumed here as a short circuit of the consumer 20 to ground.
  • T3, T4 BCX 58
  • a switch-off threshold of approximately 580 mA is set at a maximum load current of approximately 400 mA.
  • the tolerance range of the switch-off threshold is mainly determined by the spread of the base-emitter voltage of T3.
  • the Zener diode Z is irrelevant for the function of the protective circuit, but is necessary when operating a consumer 20 with an inductive component.

Abstract

A driving circuit for an electric consumer (20) with a first current source driving element (T2) connected in series with the electric consumer has a second current source driving element (T3) that forms together with the first driving element (T3) a bistable trigger circuit. In its first switching state, the bistable trigger circuit allows current to flow through the electric consumer (20). When a fault occurs, as an unacceptably high current through the electric consumer (20), the bistable trigger circuit goes into its second switching state and interrupts the flow of current through the electric consumer (20), thus avoiding overloading the first current source driving element (T2).

Description

Schaltungsanordnung zur Ansteuerung eines elektrischen Verbrauchers Circuit arrangement for controlling an electrical consumer
Stand der TechnikState of the art
Zur Ansteuerung eines elektrischen Verbrauchers, wie beispielsweise eines elektromagnetischen Relais oder eines elektromagnetischen Stellglieds, sind bereits mit dem elektrischen Verbraucher in Serie geschaltete Stromsteuerorgane bekannt, die im Fehlerfall, d.h. insbesondere bei Kurzschluß des Verbrauchers, gegen Überlastung zu schützen sind. Dazu ist es schon bekannt, eine Strombegrenzung vorzusehen, wobei die im Fehlerfall entstehende Verlustleistung erheblich höher als die maximale Verlustleistung im regulären Betrieb ist. Aus diesem Grund müssen die verwendeten elektronischen Bauelemente in der Regel überdimensioniert werden, wenn sie auch den Fehlerfall unbeschadet überstehen sollen.For the control of an electrical consumer, such as an electromagnetic relay or an electromagnetic actuator, current control devices connected in series with the electrical consumer are known. especially in the event of a short-circuit in the consumer, protection against overloading. To this end, it is already known to provide a current limitation, the power loss which arises in the event of a fault being considerably higher than the maximum power loss in normal operation. For this reason, the electronic components used usually have to be oversized if they are to survive the fault undamaged.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Schaltungsanordnung zur Ansteuerung eines elektrischen Verbrauchers mit den Merkmalen des Hauptanspruchs hat gegenüber dem Stand der Technik den Vorteil, daß das mit dem elektrischen Verbraucher in Serie geschaltete Stromsteuerorgan hinsichtlich seiner Belastbarkeit lediglich für den regulären Betriebsfall ausgelegt werden muß, da im Fehlerfall eine völlige Abschaltung des Stromsteuerorgans erfolgt, so daß im Stromsteuerorgan selbst keine erhöhte Verlustleistung abgeführt werden muß.The circuit arrangement according to the invention for controlling an electrical consumer with the features of the main claim has the advantage over the prior art that the current control element connected in series with the electrical consumer only has to be designed for normal operating conditions with regard to its load capacity, since in the event of a fault a complete shutdown of Current control member takes place so that no increased power loss has to be dissipated in the current control member itself.
Das Stromsteuerorgan läßt sich daher auch in baulicher Hinsicht wesentlich kleiner dimensionieren, was abgesehen vom Preisvorteil auch einer dichteren Packung der elektronischen Bauelemente zugute kommt.The current control element can therefore also be dimensioned much smaller in terms of construction, which, apart from the price advantage, also benefits from a denser packing of the electronic components.
In den Unteransprüchen sind vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung aufgeführt.Advantageous refinements and developments of the invention are listed in the subclaims.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 einen Stromlaufplan der Schaltungsanordnung, Figur 2eine Zustandstabelle von Teilen der Schaltungsanordnung und Figur 3 Signalformen an ausgewählten Punkten de Stromlaufplans.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. FIG. 1 shows a circuit diagram of the circuit arrangement, FIG. 2 shows a state table of parts of the circuit arrangement and FIG. 3 signal forms at selected points in the circuit diagram.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Bei dem Ausführungsbeispiel handelt es sich um eine Schaltungsanordnung zur Ansteuerung eines elektrischen Verbrauchers, wie beispielsweise eines elektromagnetischen Relais oder Stellglieds, insbesondere zur Durchführung von Schaltfunktionen in Verbindung mit einer Brennkraftmaschine.The exemplary embodiment is a circuit arrangement for controlling an electrical consumer, such as an electromagnetic relay or actuator, in particular for performing switching functions in connection with an internal combustion engine.
Im Stromlaufplan nach Figur 1 ist mit 10 eine Steuerschaltung, beispielsweise ein Mikroprozessor, bezeichnet, über dessen Ausgangsan- schluß 11 Ansteuersignale mit dem logischen Pegel H, bzw. L, abgegeben werden. Mit 20 ist ein elektrischer Verbraucher bezeichnet, dessen einer Anschluß mit der Betriebsspannung UB verbunden ist. Dem elektrischen Verbraucher 20 ist ein Stromsteuerorgan in Serie geschaltet. Hierbei handelt es sich um einen Transistor T2, der mit seinem Kollektoranschluß mit dem elektrischen Verbraucher 20 verbunden ist und dessen Emitteransqhluß über einen Widerstand R5 an Masse liegt. Der Basisanschluß des Transistors T2 ist an den Abgriff eines aus den Widerständen R3 und R4 bestehenden Spannungsteilers geführt, dessen Fußpunkt an Masse liegt und dessen Hochpunkt mit dem Kollektoranschluß eines weiteren Transistors T1 verbunden ist, dessen Basisanschluß einerseits über den Widerstand R1 mit dem Ausgangsanschluß 11 der Steuerschaltung 10 und andererseits über den Widerstand R2 mit seinem Emitteranschluß verbunden ist, der wiederum an die Betriebsspannung VGG gelegt ist.In the circuit diagram according to FIG. 1, 10 denotes a control circuit, for example a microprocessor, via the output connection 11 of which control signals with the logic level H or L are emitted. 20 denotes an electrical consumer, one connection of which is connected to the operating voltage UB. A current control element is connected in series to the electrical consumer 20. This is a transistor T2, which with its collector connection is connected to the electrical consumer 20 and its emitter connection is connected to ground via a resistor R5. The base connection of the transistor T2 is connected to the tap of a voltage divider consisting of the resistors R3 and R4, the base of which is connected to ground and the high point of which is connected to the collector connection of a further transistor T1, the base connection of which is connected via the resistor R1 to the output connection 11 Control circuit 10 and on the other hand is connected via resistor R2 to its emitter terminal, which in turn is connected to the operating voltage VGG.
Mit T3 ist ein zweites Stromsteuerorgan (Transistor) bezeichnet, dessen Kollektoranschluß an den Abgriff des Spannungsteilers R3, R4 geführt ist und dessen Emitteranschluß auf Masse liegt. Der Basisanschluß des Transistors T3 ist mit dem Abgriff eines weiteren Spannungsteilers R6, R7 verbunden, dessen Fußpunkt auf Masse liegt und dessen Hochpunkt an den Koϊlektoranschluß des ersten Stromsteuerorgans, nämlich den Transistor T2 geführt ist. Mit dem Basisanschluß des Transistors T3 ist der Kollektoranschluß eines weiteren Transistors T4 verbunden, dessen Emitteranschluß auf Masse liegt und dessen Basisanschluß über den Widerstand R8 mit dem Ausgangsanschluß 11 der Steuerschaltung 10 verbunden ist. Die Stromsteuerorgane T2 und T3 bilden zusammen eine bistabile Kippstufe, die in ihrem ersten Schaltzustand einen Stromfluß durch den elektrischen Verbraucher 20 ermöglicht und die in ihrem zweiten Schaltzustand (Sperrzustand) den Stromfluß durch den elektromagnetischen Verbraucher 20 sperrt.T3 denotes a second current control element (transistor), the collector connection of which is led to the tap of the voltage divider R3, R4 and the emitter connection of which is connected to ground. The base terminal of the transistor T3 is connected to the tap of a further voltage divider R6, R7, the base of which is at ground and the high point of which is led to the collector terminal of the first current control element, namely the transistor T2. The collector terminal of a further transistor T4 is connected to the base terminal of transistor T3, the emitter terminal of which is connected to ground and the base terminal of which is connected to the output terminal 11 of the control circuit 10 via the resistor R8. The current control elements T2 and T3 together form a bistable multivibrator which in its first switching state enables current to flow through the electrical consumer 20 and which in its second switching state (blocking state) blocks the current flow through the electromagnetic consumer 20.
Die Funktionsweise der Schaltungsanordnung läßt sich wie folgt beschreiben. Falls im leitenden Zustand von T2 der Strom I einen vorgebbaren Schwellwert überschreitet, wird T3 in den leitenden Zustand gesteuert und sperrt seinerseits das erste Stromsteuerorgen T2. Damit wird der Sperrzustand der bistabilen Kippstufe angenommen, in dem ein Stromfluß durch den elektrischen Verbraucher 20 nicht mehr stattfindet. Hierbei handelt es sich um einen stabilen Zustand, in dem von den Stromsteuerorganen, insbesondere von T2, keine Verlustleistung abgeführt werden muß. Ein im Sperrzustand gegebenenfalls noch durch R6 fließender Strom ist vernachlässigbar gering und erzeugt keine wesentliche Verlustleistung. Die Ansprechschwelle für das Umkippen der bistabilen Kippstufe in den Sperrzustand und damit der maximal zulässige Stromgrenzwert für den elektrischen Verbraucher 20 läßt sich auf einfache Weise durch geeignete Dimensionierung des Widerstands R5 in der Emitterleitung des Transistors T2 und des Widerstandsverhältnisses des Spannungsteilers R6, R7 einstellen. Transistor T4 ermöglicht ein Rücksetzen der bistabilen Kippstufe T2, T3 vom Sperrzustand in den Betriebszustand. Wenn nach. Auftreten einer Fehlersituation und deren Beseitigung am Ausgangsanschluß 11 der Steuerschaltung 10 ein Signal mit dem logischen Pegel H abgegeben wird, sperrt Transistor T4 Transistor T3. Transistor T2 bleibt dabei abgeschaltet, kann jedoch durch die nächste Flanke des Signals mit dem logischen Pegel L am Ausgangsanschluß 11 der Steuerschaltung 10 wieder regulär über Transistor T1 angesteuert werden. Falls die Fehlersituation weiterbestehen sollte (z.B. Kurzschluß des elektrischen Verbrauchers 20, bzw. unzulässig hoher Stromfluß) tritt durch Umkippen der bistabilen Schaltung in den Sperrzustand der Schutzmechanismus wie zuvor beschrieben wiederum in Kraft. Das Zustandsdiagramm nach Figur 2 erläutert die Schaltzustände am Ausgangsanschluß 11 der Steuerschaltung 10 am ersten Stromsteuerorgan T2 und am elektrischen Verbraucher 20.The functioning of the circuit arrangement can be described as follows. If the current I exceeds a predeterminable threshold value in the conductive state of T2, T3 is controlled into the conductive state and in turn blocks the first current control element T2. The blocking state of the bistable multivibrator is thus assumed, in which current no longer flows through the electrical consumer 20. This is a stable state in which no power loss has to be dissipated by the current control elements, in particular by T2. A current which may still flow through R6 in the blocking state is negligible and does not generate any significant power loss. The response threshold for the overturning of the bistable multivibrator into the blocking state and thus the maximum permissible current limit value for the electrical consumer 20 can be set in a simple manner by suitable dimensioning of the resistor R5 in the emitter line of the transistor T2 and the resistance ratio of the voltage divider R6, R7. Transistor T4 enables the bistable multivibrator T2, T3 to be reset from the blocking state to the operating state. If after. If a fault situation occurs and its elimination at the output terminal 11 of the control circuit 10, a signal with the logic level H is emitted, transistor T4 blocks transistor T3. Transistor T2 remains switched off, but can be controlled again in a regular manner via transistor T1 by the next edge of the signal with logic level L at output terminal 11 of control circuit 10. If the fault situation persists (eg short-circuit of the electrical consumer 20 or an impermissibly high current flow), the protective mechanism comes into force again as described above by tilting the bistable circuit into the locked state. The state diagram according to FIG. 2 explains the switching states at the output terminal 11 of the control circuit 10 at the first current control element T2 and at the electrical consumer 20.
Figur 3 zeigt charakteristische Signalformen als Funktion der Zeit an ausgewählten Punkten des Stromlaufplans einerseits für den regulären Betrieb, andererseits für einen Fehlerfall, der hier als Kurzschluß des Verbrauchers 20 nach Masse angenommen ist.FIG. 3 shows characteristic waveforms as a function of time at selected points in the circuit diagram, on the one hand for regular operation and, on the other hand, for a fault which is assumed here as a short circuit of the consumer 20 to ground.
Mit der vorgeschlagenen Schal tungsanordnung wird ein zuverlässiger Schutz gegen Fehlersituationen, wie unzulässig hoher Strom, bzw. Kurzschluß, erreicht, ohne daß im Fehlerfall von den verwendeten Bauelementen eine übermäßige Verlustleistung abgeführt werden muß. Die Bauelemente müssen daher nur für den regulären Betriebsfall dimensioniert werden. Die im Fehlerfall eintretenden vollständige Abschaltung des ersten Stromsteuerorgans T2 und des elektrischen Verbrauchers 20 bleibt nur für einen Schaltzyklus des Ansteuersignais der Steuerschaltung 10 bestehen, so daß nach Beseitigung der Fehlersituation ohne weiteres ein regulärer Betrieb wieder aufgenommen werden kann.With the proposed circuit arrangement, reliable protection against fault situations, such as impermissibly high current, or Short circuit achieved without excessive power loss having to be dissipated from the components used in the event of a fault. The components therefore only have to be dimensioned for regular operation. The complete shutdown of the first current control element T2 and the electrical consumer 20 which occurs in the event of a fault remains only for one switching cycle of the control signal of the control circuit 10, so that regular operation can be resumed after the fault situation has been eliminated.
In einem bevorzugten Ausführungsbeispiel der Schaltungsanordnung nach Figur 1 werden folgende Werte für die Bauelemente eingesetzt:In a preferred embodiment of the circuit arrangement according to FIG. 1, the following values are used for the components:
Z = ZY27Z = ZY27
R1 = 10KR1 = 10K
R2 = 22KR2 = 22K
R3 = 305 OhmR3 = 305 ohms
R4 = 22KR4 = 22K
R5 = 1 OhmR5 = 1 ohm
R6 = 15KR6 = 15K
R7 = 10KR7 = 10K
R8 = 100KR8 = 100K
T1 = BCX 78T1 = BCX 78
T3, T4 = BCX 58T3, T4 = BCX 58
T2 = BC 635.T2 = BC 635.
Mit dieser Dimensionierung wird bei einem maximal auftretenden Laststrom von ca. 400 mA eine Abschaltschwelle von ca. 580 mA eingestellt.With this dimensioning, a switch-off threshold of approximately 580 mA is set at a maximum load current of approximately 400 mA.
Der Toleranzbereich der Abschaltschwelle wird dabei hauptsächlich durch die Streubreite der Basis-Emitter-Spannung von T3 festgelegt.The tolerance range of the switch-off threshold is mainly determined by the spread of the base-emitter voltage of T3.
Die Zenerdiode Z ist für die Funktion der Schutzschaltung ohne Bedeutung, bei Betrieb eines Verbrauchers 20 mit induktiver Komponente jedoch notwendig. The Zener diode Z is irrelevant for the function of the protective circuit, but is necessary when operating a consumer 20 with an inductive component.

Claims

Ansprüche Expectations
1. Schaltungsanordnung zur Ansteuerung eines elektrischen Verbrauchers mit einem zum elektrischen Verbraucher in Serie geschalteten Stromsteuerorgan, dadurch gekennzeichnet, daß ein zweites Stromsteuerorgan vorgesehen ist, das zusammen mit dem erstan Stromsteuerorgan eine bistabile Kippstufe bildet, die in ihrem ersten Schaltzustand einen Stromfluß durch den elektrischen Verbraucher ermöglicht, und die in ihrem zweiten Schaltzustand (Sperrzustand) den Stromfluß durch den elektrischen Verbraucher sperrt.1. Circuit arrangement for controlling an electrical consumer with a current control element connected in series to the electrical consumer, characterized in that a second current control element is provided which, together with the first current control element, forms a bistable flip-flop which, in its first switching state, has a current flow through the electrical load enables, and in its second switching state (blocking state) blocks the flow of current through the electrical consumer.
2. Schaltungsanordnung nach Anspruch.1, dadurch gekennzeichnet, daß die bistabile Kippstufe den Sperrzustand nach überschreiten eines vorgebbaren Verbrauchergrenzstromes, insbesondere bei Auftreten eines Kurzschlusses im elektrischen Verbraucher, einnimmt.2. Circuit arrangement according to claim 1, characterized in that the bistable multivibrator takes the blocking state after exceeding a predeterminable consumer limit current, in particular when a short circuit occurs in the electrical consumer.
3. Schaltungsanordnung nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß als erstes mit dem elektrischen Verbraucher in Serie geschaltetes Stromsteuerorgan ein Transistor (T2) vorgesehen ist, dessen Emitteranschluß über einen Widerstand (R5) an Masse liegt, und dessen Basisanschluß am Abgriff eines Spannungsteilers (R3, R4) liegt, dessen Fußpunkt mit Masse und dessen Hochpunkt mit dem Kollektoranschluß eines Transistors (T1) verbunden ist, dessen Basisanschluß Steuersignale der Steuerschaltung (10) zugeführt werden, daß als zweites Stromsteuerorgan ein Transistor (T3) vorgesehen ist, der mit seinem Emitteranschluß an Masse und mit seinem Kollektoranschluß am Basisanschluß des Transistors (T2) liegt, und dessen Basisanschluß an den Abgriff eines weiteren Spannungsteilers (R6, R7) geführt ist, dessen Fußpunkt mit Masse und dessen Hochpunkt mit dem Kollektoranschluß des Transistors (T2) verbunden ist, daß zum Rücksetzen der bistabilen Kippstufe ein weiterer Transistor (T4) vorgesehen ist, dessen Emitteranschluß mit Masse und dessen Kollektoranschluß mit dem Basisanschluß des Transistors (T3) verbunden ist, und dessen Basisanschluß über einen Widerstand R8 mit dem Ausgangsanschluß (11) der Steuerschaltung (10) verbunden ist. 3. Circuit arrangement according to one of claims 1 and 2, characterized in that a transistor (T2) is provided as the first current control element connected in series with the electrical consumer, the emitter connection of which is connected to ground via a resistor (R5), and the base connection of the tap a voltage divider (R3, R4), the base of which is connected to ground and the high point of which is connected to the collector terminal of a transistor (T1), the base terminal of which control signals are fed to the control circuit (10), that a transistor (T3) is provided as the second current control element, which has its emitter connection to ground and its collector connection to the base connection of the transistor (T2), and its base connection to the tap of a further voltage divider (R6, R7) is guided, the base of which is connected to ground and the high point of which is connected to the collector connection of the transistor (T2), that a further transistor (T4) is provided for resetting the bistable multivibrator, the emitter connection to ground and the collector connection to the base connection of the transistor (T3) is connected, and the base connection of which is connected via a resistor R8 to the output connection (11) of the control circuit (10).
PCT/DE1987/000319 1986-08-09 1987-07-15 Driving circuit for an electric consumer WO1988001108A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3627006.7 1986-08-09
DE19863627006 DE3627006A1 (en) 1986-08-09 1986-08-09 CIRCUIT ARRANGEMENT FOR CONTROLLING AN ELECTRICAL CONSUMER

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FR2466889A3 (en) * 1979-10-01 1981-04-10 Labinal Overvoltage protection circuit for small DC loads - uses AND=gate as comparator to detect overvoltages and to drive transistor, via monostable, which turns off power transistors
US4360852A (en) * 1981-04-01 1982-11-23 Allis-Chalmers Corporation Overcurrent and overtemperature protective circuit for power transistor system
EP0119159A1 (en) * 1983-03-14 1984-09-19 Siemens Aktiengesellschaft Circuit with a switching transistor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1551994A (en) * 1966-10-20 1969-01-03
DE2916322A1 (en) * 1979-04-23 1980-11-13 Vdo Schindling Overload protection semiconductor circuit - has AND=gate driven by signals due to drop across protective resistor and by delayed input
FR2466889A3 (en) * 1979-10-01 1981-04-10 Labinal Overvoltage protection circuit for small DC loads - uses AND=gate as comparator to detect overvoltages and to drive transistor, via monostable, which turns off power transistors
US4360852A (en) * 1981-04-01 1982-11-23 Allis-Chalmers Corporation Overcurrent and overtemperature protective circuit for power transistor system
EP0119159A1 (en) * 1983-03-14 1984-09-19 Siemens Aktiengesellschaft Circuit with a switching transistor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5091816A (en) * 1989-10-10 1992-02-25 Kone Elevator Gmbh Procedure and device for overload and short-circuit protection of output drivers

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