EP0294794A2 - Process to open soldered contacts of a relay and circuit to execute the same - Google Patents

Process to open soldered contacts of a relay and circuit to execute the same Download PDF

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Publication number
EP0294794A2
EP0294794A2 EP19880109154 EP88109154A EP0294794A2 EP 0294794 A2 EP0294794 A2 EP 0294794A2 EP 19880109154 EP19880109154 EP 19880109154 EP 88109154 A EP88109154 A EP 88109154A EP 0294794 A2 EP0294794 A2 EP 0294794A2
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EP
European Patent Office
Prior art keywords
relay
voltage
contacts
winding
circuit
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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.)
Granted
Application number
EP19880109154
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German (de)
French (fr)
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EP0294794A3 (en
EP0294794B1 (en
Inventor
Norbert Nickolai
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication of EP0294794A2 publication Critical patent/EP0294794A2/en
Publication of EP0294794A3 publication Critical patent/EP0294794A3/en
Application granted granted Critical
Publication of EP0294794B1 publication Critical patent/EP0294794B1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/001—Means for preventing or breaking contact-welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/002—Monitoring or fail-safe circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/002—Monitoring or fail-safe circuits
    • H01H2047/003—Detecting welded contacts and applying weld break pulses to coil

Definitions

  • the invention relates to a method for releasing the contacts of an adhesive relay, one contact of which is stationary and the other contact of which is arranged on the ferromagnetic relay armature, which is attracted by its contact by applying an electrical voltage to the winding of the relay coil toward the stationary contact, and which in de-energized state of the relay coil drops again when the relay is intact, whereby the two contacts are separated again.
  • This object is achieved in that a sticking of the relay contacts is determined and that an alternating voltage or a pulsating direct voltage is applied to the winding of the relay coil in the case of relay contacts sticking together.
  • an alternating voltage or a pulsating direct voltage is excited to the winding of the relay coil with a frequency corresponding to the natural frequency of the mechanical relay structure. This causes the relay structure to vibrate naturally.
  • the AC voltage or the pulsating DC voltage is advantageously only applied to the winding of the relay coil for a specific, predetermined period of time.
  • the course of the load signal to be switched by the relay is compared with the course of the control signal of the relay in order to determine the sticking together of the relay contacts. If the course of the load signal does not follow the course of the control signal of the relay, taking into account the switching time of the relay, this means that the relay contacts are glued together.
  • a circuit arrangement for carrying out the method advantageously comprises a comparison circuit which is driven at its one input by the control signal of the relay and connected at its other input to the load circuit to be switched by the relay, the output signal of which controls a switching device by means of which the output signal of a replaces the control signal of the relay AC voltage or a pulsating DC voltage generating generator can be applied to the relay winding or to the control input of a relay driver switching the electrical current through the relay winding.
  • a time circuit is preferably provided between the output of the comparison circuit and the control input of the switching device, which output signal of the comparison circuit indicating an adhesive relay contacts only a certain, predetermined time to the Control input of the switching device switches through.
  • the circuit arrangement according to the invention has a comparison circuit 10, which is driven at its one input 12 by the control signal of the relay 14 shown in dashed lines in the figure and is connected with its other input 16 to the load circuit 18 to be switched by the relay 14.
  • sticking together of the relay contacts 20 and 22 is determined by comparing the course of the load signal to be switched by the relay 14 with the course of the control signal of the relay 14. If the load signal to be switched by the relay 14 does not follow the trigger signal of the relay, taking into account the switching time of the relay 14, this means that the two relay contacts 20 and 22 are glued together.
  • the output 24 of the comparison circuit 10 is connected to the input 26 of a time circuit 28.
  • the timer 28 is intended to prevent the relay armature 34 from shaking continuously if the connection layer between the relay contacts 20 and 22 does not break even when the relay armature 34 is shaken several times.
  • the switching device 32 when the relay 14 is functioning, switches the control signal of the relay 14 present at its one input 36 to the control input 38 of the relay driver 40, it connects, in the event that the relay contacts 20 and 22 are glued together, the output 42 of an AC voltage generator 44 with the control input 38 of the relay driver 40.
  • the alternating voltage generated by the alternating voltage generator 44 makes the relay driver 40 alternately conductive and blocking.
  • one of the output voltage of the change is applied to the winding of the relay coil 46 voltage generator 44 corresponding AC voltage applied.
  • the relay coil generates an alternating magnetic field, which exerts a shaking force on the relay armature 34.
  • the relay armature 34 is preferably excited with the natural frequency of the mechanical structure of the relay 14 in order to set the relay in natural oscillations.

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  • Relay Circuits (AREA)

Abstract

In a process for releasing the contacts of a sticking relay (14), whose one contact (20) is arranged in a fixed position and whose other contact (22) is arranged on the ferromagnetic relay armature (34), which relay armature is drawn with its contact (22) towards the fixed-position contact (20) by the application of an electrical voltage to the relay coil (46) winding, and which drops again when no current is passing through the relay coil (46) and the relay (14) is intact, as a result of which the two contacts (20, 22) are separated from one another again, sticking together of the relay contacts (20, 22) is detected and, in the event of relay contacts (20, 22) sticking together, an AC voltage or a pulsating DC voltage is applied to the relay coil (46) winding.

Description

Die Erfindung betrifft ein Verfahren zum Lösen der Kontakte eines klebenden Relais, dessen einer Kontakt ortsfest und dessen anderer Kontakt am ferromagnetischen Relaisanker angeordnet ist, der mit seinem Kontakt durch Anlegen einer elektrischen Spannung an die Wicklung der Relaisspule zum ortsfesten Kontakt hin angezogen wird und der im stromlosen Zustand der Relaisspule bei intaktem Relais wieder abfällt, wodurch die beiden Kontakte wieder voneinander getrennt werden.The invention relates to a method for releasing the contacts of an adhesive relay, one contact of which is stationary and the other contact of which is arranged on the ferromagnetic relay armature, which is attracted by its contact by applying an electrical voltage to the winding of the relay coil toward the stationary contact, and which in de-energized state of the relay coil drops again when the relay is intact, whereby the two contacts are separated again.

Bei elektrischen Schaltungen werden Laststromkreise häufig mit Hilfe von elektrischen Relais geschaltet. Der Nachteil dieser elektrischen Relais besteht jedoch darin, daß die Relaiskontakte bisweilen aufgrund des zu schaltenden hohen elektrischen Stromes zusammenkleben, d. h. durch den beim Schalten der Relais entstehenden Lichtbogen zusammengeschweißt werden. Wenn die Relais­kontakte zusammengeklebt bleiben, werden die im Last­stromkreis des Relais angeordneten Verbraucher häufig zerstört.In electrical circuits, load circuits are often switched using electrical relays. The disadvantage of these electrical relays, however, is that the relay contacts sometimes stick together due to the high electrical current to be switched, ie are welded together by the arc that arises when the relays are switched. If the relay contacts remain stuck together, the loads arranged in the load circuit of the relay are frequently destroyed.

Es ist daher Aufgabe der Erfindung, ein Verfahren zum Lösen der Kontakte eines klebenden Relais anzugeben, durch das eine Zerstörung der im Laststromkreis des Relais angeordneten Verbraucher verhindert werden kann.It is therefore an object of the invention to provide a method for releasing the contacts of an adhesive relay, by which destruction of the consumers arranged in the load circuit of the relay can be prevented.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß ein Zusammenkleben der Relaiskontakte festgestellt wird und daß bei zusammenklebenden Relaiskontakten eine Wechselspannung oder eine pulsierende Gleichspannung an die Wicklung der Relaisspule angelegt wird.This object is achieved in that a sticking of the relay contacts is determined and that an alternating voltage or a pulsating direct voltage is applied to the winding of the relay coil in the case of relay contacts sticking together.

Durch die bei zusammenklebenden Relaiskontakten an die Wicklung der Relaisspule angelegte Wechselspannung oder pulsierende Gleichspannung wird der Relaisanker durch die von der Relaisspule auf ihn ausgeübte Kraft gerüt­telt, wodurch die meist spröde Verbindungsschicht zwischen den Relaiskontakten bricht und das Relais wieder abfällt. Durch dieses Verfahren ist es möglich, die zusammenklebenden Relaiskontakte so schnell wieder voneinander zu lösen, daß eine Zerstörung der im Last­stromkreis des Relais angeordneten Verbraucher verhin­dert wird.As a result of the alternating voltage or pulsating direct voltage applied to the winding of the relay coil when the relay contacts stick together, the relay armature is shaken by the force exerted on it by the relay coil, as a result of which the mostly brittle connection layer between the relay contacts breaks and the relay drops out again. With this method it is possible to detach the adhesive relay contacts from each other again so quickly that destruction of the loads arranged in the load circuit of the relay is prevented.

Vorzugsweise wird an die Wicklung der Relaisspule eine Wechselspannung oder eine pulsierende Gleichspannung mit einer der Eigenfrequenz des mechanischen Relaisaufbaus entsprechenden Frequenz angeregt. Dadurch wird der Relaisaufbau in Eigenschwingung versetzt.Preferably, an alternating voltage or a pulsating direct voltage is excited to the winding of the relay coil with a frequency corresponding to the natural frequency of the mechanical relay structure. This causes the relay structure to vibrate naturally.

Um, für den Fall, daß die Verbindungsschicht zwischen den Relaiskontakten nicht bricht, ein Dauerrütteln am Relaisanker zu verhindern, wird die Wechselspannung oder die pulsierende Gleichspannung vorteilhaft nur eine bestimmte, vorgegebene Zeitdauer an die Wicklung der Relaisspule angelegt.In order, in the event that the connection layer between the relay contacts does not break, to prevent permanent shaking on the relay armature, the AC voltage or the pulsating DC voltage is advantageously only applied to the winding of the relay coil for a specific, predetermined period of time.

Nach einer Weiterbildung des erfindungsgemäßen Verfah­rens wird zur Feststellung des Zusammenklebens der Relaiskontakte der Verlauf des vom Relais zu schaltenden Lastsignals mit dem Verlauf des Ansteuersignals des Relais verglichen. Folgt der Verlauf des Lastsignals unter Berücksichtigung der Schaltzeit des Relais nicht dem Verlauf des Ansteuersignals des Relais, so bedeutet dies, daß die Relaiskontakte zusammengeklebt sind.According to a further development of the method according to the invention, the course of the load signal to be switched by the relay is compared with the course of the control signal of the relay in order to determine the sticking together of the relay contacts. If the course of the load signal does not follow the course of the control signal of the relay, taking into account the switching time of the relay, this means that the relay contacts are glued together.

Eine Schaltungsanordnung zur Durchführung des Verfahrens umfaßt vorteilhaft eine an ihrem einen Eingang vom Ansteuersignal des Relais angesteuerte und mit ihrem anderen Eingang an den vom Relais zu schaltenden Last­stromkreis angeschlossene Vergleichsschaltung, deren Ausgangssignal eine Umschalteinrichtung steuert, durch die anstelle des Ansteuersignals des Relais das Aus­gangssignals eines eine Wechselspannung oder eine pulsierende Gleichspannung erzeugenden Generators an die Relaiswicklung bzw. an den Steuereingang eines den elektrischen Strom durch die Relaiswicklung schaltenden Relaistreibers anlegbar ist. Um ein Dauerrütteln des Relaisankers zu verhindern, wenn die Verbindungsschicht zwischen den zusammenklebenden Relaiskontakten nicht bricht, ist vorzugsweise zwischen dem Ausgang der Vergleichsschaltung und dem Steuereingang der Umschalt­einrichtung eine Zeitschaltung vorgesehen, die ein zusammenklebende Relaiskontakte angebendes Ausgangssig­nal der Vergleichsschaltung nur eine bestimmte, vorge­gebene Zeitdauer an den Steuereingang der Umschaltein­richtung durchschaltet. Diese Schaltungsanordnung zeichnet sich insbesondere durch ihren schaltungstech­nisch einfachen Aufbau aus.A circuit arrangement for carrying out the method advantageously comprises a comparison circuit which is driven at its one input by the control signal of the relay and connected at its other input to the load circuit to be switched by the relay, the output signal of which controls a switching device by means of which the output signal of a replaces the control signal of the relay AC voltage or a pulsating DC voltage generating generator can be applied to the relay winding or to the control input of a relay driver switching the electrical current through the relay winding. In order to prevent the relay armature from shaking continuously if the connection layer between the adhesive relay contacts does not break, a time circuit is preferably provided between the output of the comparison circuit and the control input of the switching device, which output signal of the comparison circuit indicating an adhesive relay contacts only a certain, predetermined time to the Control input of the switching device switches through. This circuit arrangement is characterized in particular by its simple circuit design.

Im folgenden wird die Erfindung anhand eines Ausfüh­rungsbeispieles einer Schaltungsanordnung zur Durchfüh­rung des erfindungsgemäßen Verfahrens beschrieben.The invention is described below using an exemplary embodiment of a circuit arrangement for carrying out the method according to the invention.

Die erfindungsgemäße Schaltungsanordnung weist eine Vergleichsschaltung 10 auf, die an ihrem einen Eingang 12 vom Ansteuersignal des in der Figur gestrichelt dargestellten Relais 14 angesteuert wird und die mit ihrem anderen Eingang 16 an den vom Relais 14 zu schal­tenden Laststromkreis 18 angeschlossen ist. In der Vergleichsschaltung 10 wird ein Zusammenkleben der Relaiskontakte 20 und 22 festgestellt, indem der Verlauf des vom Relais 14 zu schaltenden Lastsignals mit dem Verlauf des Ansteuersignals des Relais 14 verglichen wird. Folgt das vom Relais 14 zu schaltende Lastsignal unter Berücksichtigung der Schaltzeit des Relais 14 nicht dem Ansteuersignal des Relais, so bedeutet dies, daß die beiden Relaiskontakte 20 und 22 zusammengeklebt sind. Der Ausgang 24 der Vergleichsschaltung 10 ist mit dem Eingang 26 einer Zeitschaltung 28 verbunden. Diese schaltet das Ausgangssignal der Vergleichsschaltung 10, für den Fall, daß ein Zusammenkleben der Relaiskontakte 20 und 22 festgestellt wurde, nur eine bestimmte, vorgegebene Zeitdauer an den Steuereingang 30 einer Umschalteinrichtung 32 durch. Mit Hilfe der Zeitschal­tung 28 soll ein Dauerrütteln des Relaisankers 34 verhindert werden, wenn die Verbindungsschicht zwischen den Relaiskontakten 20 und 22 selbst bei mehrmaligem Rütteln des Relaisankers 34 nicht bricht. Während die Umschalteinrichtung 32 bei funktionsfähigem Relais 14 das an ihrem einen Eingang 36 anliegende Ansteuersignal des Relais 14 an den Steuereingang 38 des Relaistreibers 40 durchschaltet, verbindet sie, für den Fall, daß die Relaiskontakte 20 und 22 zusammengeklebt sind, den Ausgang 42 eines Wechselspannungsgenerators 44 mit dem Steuereingang 38 des Relaistreibers 40. Durch die vom Wechselspannungsgenerator 44 erzeugte Wechselspannung wird der Relaistreiber 40 wechselweise leitend und sperrend geschaltet. Dadurch wird an die Wicklung der Relaisspule 46 eine der Ausgangsspannung des Wechsel­ spannungsgenerators 44 entsprechende Wechselspannung angelegt. Die Relaisspule erzeugt auf diese Weise ein magnetisches Wechselfeld, das eine rüttelnde Kraft auf den Relaisanker 34 ausübt. Vorzugsweise wird der Relais­anker 34 mit der Eigenfrequenz des mechanischen Aufbaus des Relais 14 angeregt, um das Relais in Eigenschwingun­gen zu versetzen. Durch diese Maßnahme werden die Relaiskontakte 20 und 22 wieder zuverlässig voneinander getrennt, so daß das Relais 14 nun wieder funktionsfähig ist. Die Trennung der Relaiskontakte 20 und 22 erfolgt dabei so schnell, daß eine Zerstörung der im Laststrom­kreis 18 des Relais 14 angeordneten, in der Figur nicht dargestellten elektrischen Verbraucher verhindert wird.The circuit arrangement according to the invention has a comparison circuit 10, which is driven at its one input 12 by the control signal of the relay 14 shown in dashed lines in the figure and is connected with its other input 16 to the load circuit 18 to be switched by the relay 14. In the comparison circuit 10, sticking together of the relay contacts 20 and 22 is determined by comparing the course of the load signal to be switched by the relay 14 with the course of the control signal of the relay 14. If the load signal to be switched by the relay 14 does not follow the trigger signal of the relay, taking into account the switching time of the relay 14, this means that the two relay contacts 20 and 22 are glued together. The output 24 of the comparison circuit 10 is connected to the input 26 of a time circuit 28. This switches the output signal of the comparison circuit 10, in the event that a sticking together of the relay contacts 20 and 22 was found, only through a certain, predetermined period of time to the control input 30 of a switching device 32. The timer 28 is intended to prevent the relay armature 34 from shaking continuously if the connection layer between the relay contacts 20 and 22 does not break even when the relay armature 34 is shaken several times. While the switching device 32, when the relay 14 is functioning, switches the control signal of the relay 14 present at its one input 36 to the control input 38 of the relay driver 40, it connects, in the event that the relay contacts 20 and 22 are glued together, the output 42 of an AC voltage generator 44 with the control input 38 of the relay driver 40. The alternating voltage generated by the alternating voltage generator 44 makes the relay driver 40 alternately conductive and blocking. As a result, one of the output voltage of the change is applied to the winding of the relay coil 46 voltage generator 44 corresponding AC voltage applied. In this way, the relay coil generates an alternating magnetic field, which exerts a shaking force on the relay armature 34. The relay armature 34 is preferably excited with the natural frequency of the mechanical structure of the relay 14 in order to set the relay in natural oscillations. By this measure, the relay contacts 20 and 22 are reliably separated from each other again, so that the relay 14 is now functional again. The separation of the relay contacts 20 and 22 takes place so quickly that a destruction of the electrical consumers arranged in the load circuit 18 of the relay 14 and not shown in the figure is prevented.

Claims (6)

1. Verfahren zum Lösen der Kontakte eines klebenden Relais, dessen einer Kontakt ortsfest und dessen anderer Kontakt am ferromagnetischen Relaisanker angeordnet ist, der mit seinem Kontakt durch Anlegen einer elektrischen Spannung an die Wicklung der Relaisspule zum ortsfesten Kontakt hin ange­zogen wird und der im stromlosen Zustand der Relaisspule bei intaktem Relais wieder abfällt, wodurch die beiden Kontakte wieder voneinander getrennt werden,
dadurch gekennzeichnet, daß ein Zusammenkleben der Relaiskontakte (20, 22) festgestellt wird und daß bei zusammenklebenden Relaiskontakten (20, 22) eine Wechselspannung oder eine pulsierende Gleichspan­nung an die Wicklung der Relaisspule (46) angelegt wird.1. Method for releasing the contacts of an adhesive relay, one contact of which is stationary and the other contact of which is arranged on the ferromagnetic relay armature, which is attracted by its contact by applying an electrical voltage to the winding of the relay coil toward the stationary contact and which is in the de-energized state the relay coil drops out when the relay is intact, whereby the two contacts are separated again,
characterized in that the relay contacts (20, 22) stick together and that when the relay contacts (20, 22) stick together, an AC voltage or a pulsating DC voltage is applied to the winding of the relay coil (46). 2. Verfahren nach Anspruch 1,
dadurch gekennzeichnet, daß die Wechselspannung oder die pulsierende Gleichspannung mit einer der Eigenfrequenz des mechanischen Relaisaufbaus entsprechenden Frequenz an die Wicklung der Relais­spule (46) angelegt wird.2. The method according to claim 1,
characterized in that the AC voltage or the pulsating DC voltage with one of the natural frequency of the mechanical relay structure corresponding frequency is applied to the winding of the relay coil (46). 3. Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß die Wechselspannung oder die pulsierende Gleichspannung nur eine bestimmte, vorgegebene Zeitdauer an die Wicklung der Relaisspule (46) angelegt wird.3. The method according to claim 1 or 2,
characterized in that the AC voltage or the pulsating DC voltage is only applied to the winding of the relay coil (46) for a specific, predetermined time. 4. Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß zur Feststellung des Zusammenklebens der Relaiskontakte (20, 22) der Verlauf des vom Relais (14) zu schaltenden Last­signals mit dem Verlauf des Ansteuersignals des Relais (14) verglichen wird.4. The method according to any one of the preceding claims,
characterized in that to determine the sticking together of the relay contacts (20, 22) the course of the load signal to be switched by the relay (14) is compared with the course of the control signal of the relay (14). 5. Schaltungsanordnung zur Durchführung des Verfahrens nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß eine an ihrem einen Eingang (12) vom Ansteuersignal des Relais (14) angesteuerte und mit ihrem anderen Eingang (16) an den vom Relais (14) zu schaltenden Laststromkreis (18) angeschlossene Vergleichsschaltung (10) vorgesehen ist, deren Ausgangssignal eine Umschalt­einrichtung (32) steuert, durch die anstelle des Ansteuersignals des Relais (14) das Ausgangssignal eines eine Wechselspannung oder eine pulsierende Gleichspannung erzeugenden Generators (44) an die Relaiswicklung bzw. an den Steuereingang (38) eines den elektrischen Strom durch die Relaiswicklung schaltenden Relaistreibers (40) anlegbar ist.5. Circuit arrangement for performing the method according to one of the preceding claims,
characterized in that there is provided at its one input (12) the control signal of the relay (14) and its other input (16) connected to the load circuit (18) to be switched by the relay (14), the comparison circuit (10) is provided, the Output signal controls a switching device (32) through which, instead of the control signal of the relay (14), the output signal of a generator (44) generating an AC voltage or a pulsating DC voltage to the relay winding or to the control input (38) of an electrical current through the relay winding switching relay driver (40) can be applied. 6. Schaltungsanordnung nach Anspruch 5,
dadurch gekennzeichnet, daß zwischen dem Ausgang (24) der Vergleichsschaltung (10) und dem Steuer­eingang (30) der Umschalteinrichtung (32) eine Zeitschaltung (28) vorgesehen ist, die ein Zusam­menkleben der Relaiskontakte (20, 22) angebendes Ausgangssignal der Vergleichsschaltung (10) nur eine bestimmte, vorgegebene Zeitdauer an den Steuereingang (30) der Umschalteinrichtung (32) durchschaltet.6. Circuit arrangement according to claim 5,
characterized in that between the output (24) of the comparison circuit (10) and the control input (30) of the switching device (32) A timer circuit (28) is provided, which switches through the output signal of the comparison circuit (10) indicating a sticking together of the relay contacts (20, 22) only to the control input (30) of the switching device (32) for a specific, predetermined period of time.
EP88109154A 1987-06-10 1988-06-08 Process to open soldered contacts of a relay and circuit to execute the same Expired - Lifetime EP0294794B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873719298 DE3719298A1 (en) 1987-06-10 1987-06-10 METHOD FOR RELEASING THE CONTACTS OF AN ADHESIVE RELAY, AND CIRCUIT ARRANGEMENT FOR IMPLEMENTING THE METHOD
DE3719298 1987-06-10

Publications (3)

Publication Number Publication Date
EP0294794A2 true EP0294794A2 (en) 1988-12-14
EP0294794A3 EP0294794A3 (en) 1990-08-29
EP0294794B1 EP0294794B1 (en) 1993-08-11

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EP88109154A Expired - Lifetime EP0294794B1 (en) 1987-06-10 1988-06-08 Process to open soldered contacts of a relay and circuit to execute the same

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US (1) US4914315A (en)
EP (1) EP0294794B1 (en)
DE (2) DE3719298A1 (en)
ES (1) ES2043728T3 (en)

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Also Published As

Publication number Publication date
DE3719298C2 (en) 1991-02-07
US4914315A (en) 1990-04-03
EP0294794A3 (en) 1990-08-29
DE3883086D1 (en) 1993-09-16
DE3719298A1 (en) 1988-12-22
ES2043728T3 (en) 1994-01-01
EP0294794B1 (en) 1993-08-11

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