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EP2775500B1 - Switching assembly - Google Patents

Switching assembly Download PDF

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Publication number
EP2775500B1
EP2775500B1 EP14153170.7A EP14153170A EP2775500B1 EP 2775500 B1 EP2775500 B1 EP 2775500B1 EP 14153170 A EP14153170 A EP 14153170A EP 2775500 B1 EP2775500 B1 EP 2775500B1
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EP
European Patent Office
Prior art keywords
circuit
switching device
transistor
safety switching
circuit arrangement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP14153170.7A
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German (de)
French (fr)
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EP2775500A1 (en
Inventor
Henry Peter
Markus Rohs
Thomas Pott
Markus Eilers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Phoenix Contact GmbH and Co KG
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Phoenix Contact GmbH and Co KG
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Publication of EP2775500A1 publication Critical patent/EP2775500A1/en
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    • 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
    • H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
    • H01H47/32—Energising current supplied by semiconductor device

Definitions

  • a safety chain consists of a sensor (emergency stop), a logic (safety relay) and an actuator, such as a contactor and motor.
  • a sensor electronic device
  • a logic safety relay
  • an actuator such as a contactor and motor.
  • a two-channel structure is required.
  • at least two relays are installed in relay modules, which ensure a certain level of security by respective logic circuits.
  • relays are enabled or turned on directly with an input signal or through transistors or FETs.
  • a protective device for power transmission uses a combination of a current transformer and a voltage converter to operate a main switch.
  • a synchronization circuit is known which comprises a microcontroller whose output is connected via a series of transistors to a relay module. It is therefore an object of the present invention to further increase safety.
  • a circuit arrangement having a relay assembly with an excitation coil additionally comprises a safety switching device, wherein in a first switching state of the safety switching device, an electrical circuit with at least the excitation coil is electrically shorted and in a second switching state of the safety switching device of the circuit is electrically isolated with at least the excitation coil.
  • the circuit arrangement has a release signal input for an enable signal, which is electrically conductively connected to a signal input of a return circuit.
  • the excitation coil has a first exciter coil terminal and a second exciter coil terminal
  • the safety switching device has a first terminal and a second terminal, wherein the first terminal to the first field coil terminal and the second terminal to the second field coil terminal is electrically connected to electrically short the circuit in the second switching state.
  • the safety switching device has a transistor assembly.
  • the safety switching device consists of readily available, reliably functioning and inexpensive components, such as e.g. Transistors, such as Bipolar transistors, is formed.
  • the circuit arrangement has a Freigabesignaleingang for an enable signal, which is electrically connected to a release signal input of the drive circuit, wherein the drive circuit is electrically connected to the relay module for controlling the relay module.
  • an enable signal applied to the enable signal input activates both the drive circuit and the safety switching device.
  • the drive circuit and circuitry are arranged in parallel.
  • the safety switching device has an input terminal which is electrically conductively connected to a drive output of the drive circuit.
  • the return circuit has a transistor assembly. This achieves the technical advantage that the
  • Safety switching device made of readily available, reliable functioning and inexpensive components, such. Transistors, is formed. As transistors, bipolar transistors can be used. Thus, a reliable and inexpensive safety switching device is provided.
  • a return circuit is provided which is electrically connected to the safety switching device in order to effect a change from the second switching state to the first switching state.
  • the safety switching device has an input terminal, which is electrically conductively connected to a drive output of the return circuit.
  • a current limiting assembly is arranged in series electrically with the exciter coil.
  • the current limiting module may be formed as a transistor assembly and have additional switching resistors.
  • the object is achieved by a safety switching device for such a circuit arrangement.
  • a safety switching device for such a circuit arrangement.
  • Circuit arrangement 100 shown is designed as a safety circuit for use in a safety chain, eg consisting of an emergency stop sensor, a safety switching device and an actuator in an automation device.
  • the circuit arrangement 100 is constructed discretely.
  • the circuit arrangement 100 has a supply connection 102, a ground connection 104 and an enable signal input 106 for an enable signal F. Furthermore, in the present exemplary embodiment, the circuit arrangement 100 has a drive circuit 110, a relay module 108, a safety switching device 112, a return circuit 114 and a current limiting module 116.
  • the relay module 108 has an exciter coil 118 with a first exciter coil terminal 122 and a second exciter coil terminal 124 and a freewheeling diode 120.
  • the Free-wheeling diode 120 electrically conductively connected, so that in the present embodiment, the freewheeling diode 120 is connected in parallel to the exciting coil 118.
  • a current limiting assembly 116 is disposed so that the current limiting assembly 116 and the relay assembly 108 are electrically connected in series with the exciting coil 118.
  • the current limiting assembly 116 is in the present embodiment of a resistor with a positive temperature coefficient, such. a PCT resistor (not shown) or transistors (not shown) and ohmic resistors (not shown) formed.
  • the relay assembly 108 has a first port 172 and a second port 174.
  • the first terminal 172 is connected to the first exciting coil terminal 122, and the second terminal 174 is electrically connected to the second exciting coil terminal 124.
  • the safety switching device 112 is electrically conductively connected to the first connection 172 and the second connection 174. It is thus electrically connected in parallel to the excitation coil 118 in the present embodiment.
  • the safety switching device 112 in the present embodiment comprises a transistor assembly 126, which in the present embodiment comprises a transistor 128, such as a transistor. a bipolar transistor, and two ohmic resistors 132, 134, which form a voltage divider 130 for supplying the base of the transistor 128 in the present embodiment.
  • the transistor 128 is designed as a bipolar transistor, wherein the collector of the transistor 128 is connected to the first terminal 172 and the emitter of the transistor 128 is connected to the second terminal 174.
  • the transistor is formed as an NPN transistor.
  • the collector-emitter path of the transistor 128 to the excitation coil 118 forms an electrical circuit 180, with which the excitation coil 118 can be short-circuited.
  • the drive circuit 110 has a signal input 166, which is electrically conductively connected to the enable signal input 106 via an ohmic input resistance 150 of the circuit arrangement 100. Furthermore, the drive circuit 110 has a drive output 178, which is electrically conductively connected to a first input terminal 168a of the safety switching device 112 in an electrically conductive manner. The first input terminal 168a makes electrical connection to the excitation coil 118, to the freewheeling diode 120, to the emitter-collector path of the transistor 128, and to the ohmic resistor 134 of the voltage divider 130.
  • the drive circuit 110 has a transistor assembly 154, which in the present exemplary embodiment has a transistor 156, two ohmic resistors 160, 162 and an input diode 164.
  • the two ohmic resistors 160, 162 form a voltage divider 158 for supplying the base of the transistor 156, which is formed in the present embodiment as a bipolar transistor.
  • the transistor is formed as an NPN transistor.
  • the input diode 164 is arranged in the present embodiment.
  • the emitter of the transistor 156 is electrically connected to the ground terminal 104 of the circuit arrangement 100.
  • a second input terminal 168b of the safety switching device 112 is electrically connected to a drive output 176 of the return circuit 114.
  • the second input terminal 168b is electrically conductively connected to the ohmic resistor 132.
  • the drive circuit 110 and the return circuit 114 are arranged in parallel with each other. Both the drive circuit 110 and the return circuit 114 are the input side via the respective signal inputs 152 166, the enable signal F supplied. On the output side are both the Drive circuit 110 and the return circuit 114 to the safety switching device 112 via the respective drive outputs 176, 178 electrically connected to the first input terminal 168a and second input terminal 168b.
  • the return circuit 114 has a signal input 152, which is electrically conductively connected to the enable signal input 106 of the circuit arrangement 100. Furthermore, the return circuit 114 has an electrical supply input 170, with which the return circuit 114 is electrically conductively connected to the supply terminal 102. Furthermore, in the present exemplary embodiment, the return circuit 114 has a transistor assembly 136, which in the present embodiment, a transistor 138, in the present embodiment, a bipolar transistor, and a voltage divider 140 with an ohmic resistance 142 and a resistor 144 and an input diode 146 and an ohmic input resistance 148 on. In the present embodiment, the transistor 138 is formed as an NPN transistor.
  • the input diode 146 is arranged between the signal input 152 of the return circuit 114 and the ohmic resistor 142 of the voltage divider 140, which serves to supply the base of the transistor 138. Between the supply terminal 102 and the collector of the transistor 138, the ohmic input resistance 148 is arranged, wherein in the present embodiment between the ohmic input resistance 148 and the collector of the transistor 138, the drive output 176 of the return circuit 114 is arranged. Furthermore, both the emitter of the transistor 138 and the second ohmic resistor 144 of the voltage divider 140 to the ground terminal 104 is electrically connected.
  • the collector-emitter path of the transistor 156 of the drive circuit 110 becomes electrically conductive.
  • an electric current flows from the supply terminal 102 through the excitation coil 118 to the ground terminal 104.
  • the enable signal F causes the collector-emitter path of the transistor 138 of the return circuit 114 to become electrically conductive.
  • the collector-emitter path of the transistor 156 of the drive circuit 110 is no longer electrically conductive, so that the collector-emitter path of the transistor 128 of the safety switching device 112 becomes electrically conductive. Therefore, the safety switching device 112 is now in a switching state in which the electric circuit 180 is electrically short-circuited.
  • the current limiting assembly 116 provided in the present embodiment ensures that no electrical currents with current intensities occur in the safety circuit 100, which can lead to damage of components of the safety circuit 100 due to overloading.
  • the transistor 128 of the safety switching device 112 short-circuits the excitation coil 118 of the relay module 108 as long as no enable signal F is present at the enable signal input 106. As a result, the relay assembly 108 can not be released.
  • the transistor 138 of the return circuit 114 causes a deactivation of the transistor 128 of the safety switching device 112, so that the circuit 180 is opened and thus the electrical short circuit is canceled.

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  • Relay Circuits (AREA)
  • Electronic Switches (AREA)

Description

Die Erfindung betrifft eine Schaltungsanordnung mit einer Relaisbaugruppe mit einer Erregerspule.
In einer Automatisierungseinrichtung besteht eine Sicherheitskette aus einem Sensor (Nothalt), einer Logik (Sicherheitsschaltgerät) und einem Aktor, wie z.B. einem Schütz und Motor. Für bestimmte Sicherheitsintegritätslevel, wie z.B. gemäß EN 61 508, und/oder Kategorien, wie z.B. gemäß EN ISO 13849, wird eine zweikanalige Struktur gefordert. Hierzu werden in Relais-Modulen mindestens zwei Relais verbaut, welche ein bestimmtes Sicherheitsniveau durch jeweilige Logikschaltungen gewährleisten. In diskret aufgebauten Schaltungen für die funktionale Sicherheit werden Relais direkt mit einem Eingangssignal oder über Transistoren oder FETs freigegeben oder eingeschaltet. Jedoch ist es bei diskret aufgebauten Schaltungen für die funktionale Sicherheit schwierig, Signale zu überwachen.
Aus der GB 03192 A A.D. 1909 ist eine Schutzvorrichtung für Leistungsübertragung bekannt. Die Schutzvorrichtung verwendet eine Kombination aus einem Stromwandler und einem Spannungswandler, um einen Hauptschalter zu betätigen.
Aus der US 5 055 962 A ist eine Synchronisationsschaltung bekannt, die einen Mikrokontroller umfasst, dessen Ausgang über eine Reihe von Transistoren mit einer Relaisbaugruppe geschaltet ist.
Es ist daher Aufgabe der vorliegenden Erfindung, die Sicherheit weiter zu steigern.The invention relates to a circuit arrangement with a relay assembly with an excitation coil.
In an automation device, a safety chain consists of a sensor (emergency stop), a logic (safety relay) and an actuator, such as a contactor and motor. For certain safety integrity levels, eg according to EN 61 508, and / or categories, eg according to EN ISO 13849, a two-channel structure is required. For this purpose, at least two relays are installed in relay modules, which ensure a certain level of security by respective logic circuits. In discrete functional safety circuits, relays are enabled or turned on directly with an input signal or through transistors or FETs. However, in discrete functional safety circuits, it is difficult to monitor signals.
From GB 03192 A AD 1909 a protective device for power transmission is known. The protection device uses a combination of a current transformer and a voltage converter to operate a main switch.
From the US 5 055 962 A For example, a synchronization circuit is known which comprises a microcontroller whose output is connected via a series of transistors to a relay module.
It is therefore an object of the present invention to further increase safety.

Diese Aufgabe wird durch die Gegenstände mit den Merkmalen nach dem unabhängigen Anspruch 1 gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche, der Beschreibung und der Zeichnung.
Die vorliegende Erfindung basiert auf der Erkenntnis, dass durch elektrisches Kurzschließen einer Erregerspule einer Relaisbaugruppe die Sicherheit bei der Ansteuerung/Freigabe von Relais deutlich gesteigert werden kann.This object is achieved by the objects having the features according to independent claim 1. Advantageous embodiments are the subject of the dependent claims, the description and the drawings.
The present invention is based on the recognition that electrical short-circuiting of an exciter coil of a relay module can significantly increase the safety during the activation / release of relays.

Gemäß einem ersten Aspekt wird die Aufgabe dadurch gelöst, dass eine Schaltungsanordnung mit einer Relaisbaugruppe mit einer Erregerspule zusätzlich eine Sicherheitsschalteinrichtung aufweist, wobei in einem ersten Schaltzustand der Sicherheitsschalteinrichtung ein elektrischer Stromkreis mit mindestens der Erregerspule elektrisch kurzgeschlossen ist und in einem zweiten Schaltzustand der Sicherheitsschalteinrichtung der Stromkreis mit mindestens der Erregerspule elektrisch getrennt ist. Dadurch wird der technische Vorteil erreicht, dass durch den elektrischen Kurzschluss der Erregerspule eine Fehlbedienung der Relaisbaugruppe zuverlässig ausgeschlossen ist. Durch den elektrischen Kurzschluss erfolgt also keine Freigabe des Relais, während bei einer elektrischen Trennung das Relais freigegeben ist. Somit ist die Sicherheit gesteigert.According to a first aspect, the object is achieved in that a circuit arrangement having a relay assembly with an excitation coil additionally comprises a safety switching device, wherein in a first switching state of the safety switching device, an electrical circuit with at least the excitation coil is electrically shorted and in a second switching state of the safety switching device of the circuit is electrically isolated with at least the excitation coil. As a result, the technical advantage is achieved that a faulty operation of the relay module is reliably excluded by the electrical short circuit of the exciter coil. Due to the electrical short circuit so no release of the relay takes place, while at an electrical isolation, the relay is released. Thus, the security is increased.

Die Schaltungsanordnung weist einen Freigabesignaleingang für ein Freigabesignal auf, der mit einem Signaleingang einer Rückholschaltung elektrisch leitend verbunden ist. Dadurch wird der technische Vorteil erreicht, dass zugleich auch die Rückholschaltung mit dem Freigabesignal angesteuert werden kann. Eine Rückholschaltung ist vorgesehen, die mit der Sicherheitsschalteinrichtung elektrisch in Verbindung steht, um einen Wechsel von dem zweiten Schaltzustand in den ersten Schaltzustand zu bewirken. Dadurch wird der technische Vorteil erreicht, dass die Sicherheitsschalteinrichtung wieder deaktiviert werden kann, so dass sich die Schalteinrichtung im zweiten Schaltzustand befindet, in dem der Stromkreis elektrisch getrennt ist.The circuit arrangement has a release signal input for an enable signal, which is electrically conductively connected to a signal input of a return circuit. As a result, the technical advantage is achieved that at the same time the return circuit can be controlled with the enable signal. A return circuit is provided which is in electrical communication with the safety switching means to effect a change from the second switching state to the first switching state. Thereby, the technical advantage is achieved that the safety switching device can be deactivated again, so that the switching device is in the second switching state, in which the circuit is electrically isolated.

In einer weiteren vorteilhaften Ausführungsform weist die Erregerspule einen ersten Erregerspulenanschluss und einen zweiten Erregerspulenanschluss auf, und die Sicherheitsschalteinrichtung weist einen ersten Anschluss und einen zweiten Anschluss auf, wobei der erste Anschluss mit dem ersten Erregerspulenanschluss und der zweite Anschluss mit dem zweiten Erregerspulenanschluss elektrisch leitend verbunden ist, um im zweiten Schaltzustand den Stromkreis elektrisch kurzzuschließen. Dadurch wird der technische Vorteil erreicht, dass der elektrische Stromkreis unmittelbar mit dem ersten und zweiten Erregerspulenanschluss gebildet wird und eventuelle Kurzschlussströme nicht durch andere Abschnitte der Schaltungsanordnung fließen, wo sie Bauelemente der Schaltungsanordnung beschädigen können.In a further advantageous embodiment, the excitation coil has a first exciter coil terminal and a second exciter coil terminal, and the safety switching device has a first terminal and a second terminal, wherein the first terminal to the first field coil terminal and the second terminal to the second field coil terminal is electrically connected to electrically short the circuit in the second switching state. This achieves the technical advantage that the electrical circuit is formed directly with the first and second excitation coil terminals and that any short-circuit currents do not flow through other sections of the circuit arrangement where they can damage components of the circuit arrangement.

In einer weiteren vorteilhaften Ausführungsform weist die Sicherheitsschalteinrichtung eine Transistorbaugruppe auf. Dadurch wird der technische Vorteil erreicht, dass die Sicherheitsschalteinrichtung aus leicht verfügbaren, zuverlässig funktionierenden und preiswerten Bauelementen, wie z.B. Transistoren, wie z.B. Bipolartransistoren, gebildet ist. So wird eine zuverlässige und preiswerte Sicherheitsschalteinrichtung bereitgestellt. In einer vorteilhaften Ausführungsform weist die Schaltungsanordnung einen Freigabesignaleingang für ein Freigabesignal auf, der mit einem Freigabesignaleingang der Ansteuerschaltung elektrisch leitend verbunden ist, wobei die Ansteuerschaltung mit der Relaisbaugruppe zur Ansteuerung der Relaisbaugruppe elektrisch leitend verbunden ist. Dadurch wird der technische Vorteil erreicht, dass ein an dem Freigabesignaleingang anliegendes Freigabesignal sowohl die Ansteuerschaltung als auch die Sicherheitsschalteinrichtung ansteuert. Somit sind die Ansteuerschaltung und Schaltungsanordnung parallel geschaltet angeordnet.In a further advantageous embodiment, the safety switching device has a transistor assembly. This achieves the technical advantage that the safety switching device consists of readily available, reliably functioning and inexpensive components, such as e.g. Transistors, such as Bipolar transistors, is formed. Thus, a reliable and inexpensive safety switching device is provided. In an advantageous embodiment, the circuit arrangement has a Freigabesignaleingang for an enable signal, which is electrically connected to a release signal input of the drive circuit, wherein the drive circuit is electrically connected to the relay module for controlling the relay module. As a result, the technical advantage is achieved that an enable signal applied to the enable signal input activates both the drive circuit and the safety switching device. Thus, the drive circuit and circuitry are arranged in parallel.

In einer vorteilhaften Ausführungsform weist die Sicherheitsschalteinrichtung einen Eingangsanschluss auf, der mit einem Ansteuerausgang der Ansteuerschaltung elektrisch leitend verbunden ist. Dadurch wird der technische Vorteil erreicht, dass über die Ansteuerschaltung die Sicherheitsschalteinrichtung angesteuert werden kann.In an advantageous embodiment, the safety switching device has an input terminal which is electrically conductively connected to a drive output of the drive circuit. As a result, the technical advantage is achieved that the safety switching device can be controlled via the drive circuit.

In einer vorteilhaften Ausführungsform weist die Rückholschaltung eine Transistorbaugruppe auf. Dadurch wird der technische Vorteil erreicht, dass dieIn an advantageous embodiment, the return circuit has a transistor assembly. This achieves the technical advantage that the

Sicherheitsschalteinrichtung aus leicht verfügbaren, zuverlässig funktionierenden und preiswerten Bauelementen, wie z.B. Transistoren, gebildet ist. Als Transistoren können Bipolartransistoren verwendet werden. Somit wird eine zuverlässige und preiswerte Sicherheitsschalteinrichtung bereitgestellt.Safety switching device made of readily available, reliable functioning and inexpensive components, such. Transistors, is formed. As transistors, bipolar transistors can be used. Thus, a reliable and inexpensive safety switching device is provided.

In einer vorteilhaften Ausführungsform ist eine Rückholschaltung vorgesehen, die mit der Sicherheitsschalteinrichtung elektrisch in Verbindung steht, um einen Wechsel von dem zweiten Schaltzustand in den ersten Schaltzustand zu bewirken. Dadurch wird der technische Vorteil erreicht, dass die Sicherheitsschalteinrichtung wieder deaktiviert werden kann, so dass sich die Schalteinrichtung im zweiten Schaltzustand befindet, in dem der Stromkreis elektrisch getrennt ist.In an advantageous embodiment, a return circuit is provided which is electrically connected to the safety switching device in order to effect a change from the second switching state to the first switching state. Thereby, the technical advantage is achieved that the safety switching device can be deactivated again, so that the switching device is in the second switching state, in which the circuit is electrically isolated.

In einer vorteilhaften Ausführungsform weist die Sicherheitsschalteinrichtung einen Eingangsanschluss auf, der mit einem Ansteuerausgang der Rückholschaltung elektrisch leitend verbunden ist. Dadurch wird der technische Vorteil erreicht, dass die Sicherheitsschalteinrichtung und die Rückholschaltung so miteinander verbunden sind, dass ein Aktivieren der Rückholschaltung die Schaltungsanordnung deaktiviert.In an advantageous embodiment, the safety switching device has an input terminal, which is electrically conductively connected to a drive output of the return circuit. This achieves the technical advantage that the safety switching device and the return circuit are connected to one another in such a way that activating the return circuit deactivates the circuit arrangement.

In einer vorteilhaften Ausführungsform ist eine Strombegrenzungsbaugruppe in Reihe elektrisch zu der Erregerspule angeordnet. Dadurch wird der technische Vorteil erreicht, dass Bauelemente der Schaltungsanordnung vor einer Beschädigung durch hohe Kurzschlussströme geschützt sind. Die Strombegrenzungsbaugruppe kann als Transistorbaugruppe ausgebildet sein und zusätzliche Umschaltwiderstände aufweisen.In an advantageous embodiment, a current limiting assembly is arranged in series electrically with the exciter coil. As a result, the technical advantage is achieved that components of the circuit arrangement are protected against damage by high short-circuit currents. The current limiting module may be formed as a transistor assembly and have additional switching resistors.

Gemäß einem zweiten Aspekt wird die Aufgabe gelöst durch eine Sicherheitsschalteinrichtung für eine derartige Schaltungsanordnung. Dadurch wird der technische Vorteil erreicht, dass durch den elektrischen Kurzschluss der Erregerspule eine Fehlbedienung der Relaisbaugruppe zuverlässig ausgeschlossen ist. Somit ist die Sicherheit gesteigert.According to a second aspect, the object is achieved by a safety switching device for such a circuit arrangement. As a result, the technical advantage is achieved that a faulty operation of the relay module is reliably excluded by the electrical short circuit of the exciter coil. Thus, the security is increased.

Weitere Ausführungsbeispiele werden Bezug nehmend auf die beiliegende Zeichnung erläutert. Es zeigt:

Fig. 1
einen schematische Schaltplan einer Schaltungsanordnung.
Further embodiments will be explained with reference to the accompanying drawings. It shows:
Fig. 1
a schematic diagram of a circuit arrangement.

Die in Fig. 1 gezeigte Schaltungsanordnung 100 ist als Sicherheitsschaltung zum Einsatz in einer Sicherheitskette, z.B. bestehend aus einem Nothalt-Sensor, einem Sicherheitsschaltgerät und einem Aktor, in einer Automatisierungseinrichtung ausgebildet. Im vorliegenden Ausführungsbeispiel ist die Schaltungsanordnung 100 diskret aufgebaut.In the Fig. 1 Circuit arrangement 100 shown is designed as a safety circuit for use in a safety chain, eg consisting of an emergency stop sensor, a safety switching device and an actuator in an automation device. In the present embodiment, the circuit arrangement 100 is constructed discretely.

Im vorliegenden Ausführungsbeispiel weist die Schaltungsanordnung 100 einen Versorgungsanschluss 102, einen Masseanschluss 104 und einen Freigabesignaleingang 106 für ein Freigabesignal F auf. Ferner weist die Schaltungsanordnung 100 im vorliegenden Ausführungsbeispiel eine Ansteuerschaltung 110, eine Relaisbaugruppe 108, eine Sicherheitsschalteinrichtung 112, eine Rückholschaltung 114 und eine Strombegrenzungsbaugruppe 116 auf.In the present exemplary embodiment, the circuit arrangement 100 has a supply connection 102, a ground connection 104 and an enable signal input 106 for an enable signal F. Furthermore, in the present exemplary embodiment, the circuit arrangement 100 has a drive circuit 110, a relay module 108, a safety switching device 112, a return circuit 114 and a current limiting module 116.

Die Relaisbaugruppe 108 weist im vorliegenden Ausführungsbeispiel eine Erregerspule 118 mit einem ersten Erregerspulenanschluss 122 und einem zweiten Erregerspulenanschluss 124 sowie einer Freilaufdiode 120 auf. Mit dem ersten Erregerspulenanschluss 122 und dem zweiten Erregerspulenanschluss 124 ist die Freilaufdiode 120 elektrisch leitend verbunden, so dass im vorliegenden Ausführungsbeispiel die Freilaufdiode 120 parallel zur Erregerspule 118 geschaltet ist.In the present exemplary embodiment, the relay module 108 has an exciter coil 118 with a first exciter coil terminal 122 and a second exciter coil terminal 124 and a freewheeling diode 120. With the first exciting coil terminal 122 and the second exciting coil terminal 124, the Free-wheeling diode 120 electrically conductively connected, so that in the present embodiment, the freewheeling diode 120 is connected in parallel to the exciting coil 118.

Zwischen dem ersten Erregerspulenanschluss 122 und dem Versorgungsanschluss 102 ist im vorliegenden Ausführungsbeispiel eine Strombegrenzungsbaugruppe 116 angeordnet, so dass die Strombegrenzungsbaugruppe 116 und die Relaisbaugruppe 108 mit der Erregerspule 118 elektrisch in Reihe geschaltet sind.Between the first excitation coil terminal 122 and the supply terminal 102, in the present embodiment, a current limiting assembly 116 is disposed so that the current limiting assembly 116 and the relay assembly 108 are electrically connected in series with the exciting coil 118.

Die Strombegrenzungsbaugruppe 116 ist im vorliegenden Ausführungsbeispiel aus einem Widerstand mit einem positiven Temperaturkoeffizienten, wie z.B. einem PCT-Widerstand (nicht dargestellt) oder aus Transistoren (nicht dargestellt) und ohmschen Widerständen (nicht dargestellt) gebildet.The current limiting assembly 116 is in the present embodiment of a resistor with a positive temperature coefficient, such. a PCT resistor (not shown) or transistors (not shown) and ohmic resistors (not shown) formed.

Ferner weist im vorliegenden Ausführungsbeispiel die Relaisbaugruppe 108 einen ersten Anschluss 172 und einen zweiten Anschluss 174 auf. Der erste Anschluss 172 ist mit dem ersten Erregerspulenanschluss 122, und der zweite Anschluss 174 ist mit dem zweiten Erregerspulenanschluss 124 elektrisch leitend verbunden.Further, in the present embodiment, the relay assembly 108 has a first port 172 and a second port 174. The first terminal 172 is connected to the first exciting coil terminal 122, and the second terminal 174 is electrically connected to the second exciting coil terminal 124.

Mit dem ersten Anschluss 172 und dem zweiten Anschluss 174 ist die Sicherheitsschalteinrichtung 112 elektrisch leitend verbunden. Sie ist somit im vorliegenden Ausführungsbeispiel zu der Erregerspule 118 elektrisch parallel geschaltet. Die Sicherheitsschalteinrichtung 112 weist im vorliegenden Ausführungsbeispiel eine Transistorbaugruppe 126, die im vorliegenden Ausführungsbeispiel einen Transistor 128, wie z.B. einen Bipolartransistor, sowie zwei ohmsche Widerstände 132, 134 auf, die im vorliegenden Ausführungsbeispiel einen Spannungsteiler 130 zur Versorgung der Basis des Transistors 128 bilden. Im vorliegenden Ausführungsbeispiel ist der Transistor 128 als Bipolartransistor ausgebildet, wobei der Kollektor des Transistors 128 mit dem ersten Anschluss 172 und der Emitter des Transistors 128 mit dem zweiten Anschluss 174 verbunden ist. Im vorliegenden Ausführungsbeispiel ist der Transistor als NPN- Transistor ausgebildet.The safety switching device 112 is electrically conductively connected to the first connection 172 and the second connection 174. It is thus electrically connected in parallel to the excitation coil 118 in the present embodiment. The safety switching device 112 in the present embodiment comprises a transistor assembly 126, which in the present embodiment comprises a transistor 128, such as a transistor. a bipolar transistor, and two ohmic resistors 132, 134, which form a voltage divider 130 for supplying the base of the transistor 128 in the present embodiment. In the present exemplary embodiment, the transistor 128 is designed as a bipolar transistor, wherein the collector of the transistor 128 is connected to the first terminal 172 and the emitter of the transistor 128 is connected to the second terminal 174. In the present embodiment, the transistor is formed as an NPN transistor.

Somit bildet im vorliegenden Ausführungsbeispiel die Kollektor-Emitter-Strecke des Transistors 128 mit der Erregerspule 118 einen elektrischen Stromkreis 180, mit dem die Erregerspule 118 kurzgeschlossen werden kann.Thus, in the present embodiment, the collector-emitter path of the transistor 128 to the excitation coil 118 forms an electrical circuit 180, with which the excitation coil 118 can be short-circuited.

Die Ansteuerschaltung 110 weist im vorliegenden Ausführungsbeispiel einen Signaleingang 166 auf, der über einen ohmschen Eingangswiderstand 150 der Schaltungsanordnung 100 mit dem Freigabesignaleingang 106 elektrisch leitend verbunden ist. Ferner weist die Ansteuerschaltung 110 einen Ansteuerausgang 178 auf, der elektrisch leitend mit einem ersten Eingangsanschluss 168a der Sicherheitsschalteinrichtung 112 elektrisch leitend verbunden ist. Der erste Eingangsanschluss 168a stellt eine elektrische Verbindung zu der Erregerspule 118, zu der Freilaufdiode 120, zu der Emitter-Kollektor-Strecke des Transistors 128 und zu dem ohmschen Widerstand 134 des Spannungsteilers 130 her.In the present exemplary embodiment, the drive circuit 110 has a signal input 166, which is electrically conductively connected to the enable signal input 106 via an ohmic input resistance 150 of the circuit arrangement 100. Furthermore, the drive circuit 110 has a drive output 178, which is electrically conductively connected to a first input terminal 168a of the safety switching device 112 in an electrically conductive manner. The first input terminal 168a makes electrical connection to the excitation coil 118, to the freewheeling diode 120, to the emitter-collector path of the transistor 128, and to the ohmic resistor 134 of the voltage divider 130.

Ferner weist die Ansteuerschaltung 110 im vorliegenden Ausführungsbeispiel eine Transistorbaugruppe 154 auf, die im vorliegenden Ausführungsbeispiel einen Transistor 156, zwei ohmsche Widerstände 160, 162 sowie eine Eingangsdiode 164 aufweist. Die beiden ohmschen Widerstände 160, 162 bilden einen Spannungsteiler 158 zur Versorgung der Basis des Transistors 156, der im vorliegenden Ausführungsbeispiel als Bipolartransistor ausgebildet ist. Im vorliegenden Ausführungsbeispiel ist der Transistor als NPN-Transistor ausgebildet.Furthermore, in the present exemplary embodiment, the drive circuit 110 has a transistor assembly 154, which in the present exemplary embodiment has a transistor 156, two ohmic resistors 160, 162 and an input diode 164. The two ohmic resistors 160, 162 form a voltage divider 158 for supplying the base of the transistor 156, which is formed in the present embodiment as a bipolar transistor. In the present embodiment, the transistor is formed as an NPN transistor.

Zwischen dem ohmschen Widerstand 160 und dem Signaleingang 166 der Ansteuerschaltung 110 ist im vorliegenden Ausführungsbeispiel die Eingangsdiode 164 angeordnet. Der Emitter des Transistors 156 ist mit dem Masseanschluss 104 der Schaltungsanordnung 100 elektrisch leitend verbunden.Between the ohmic resistance 160 and the signal input 166 of the drive circuit 110, the input diode 164 is arranged in the present embodiment. The emitter of the transistor 156 is electrically connected to the ground terminal 104 of the circuit arrangement 100.

Ferner ist im vorliegenden Ausführungsbeispiel ein zweiter Eingangsanschluss 168b der Sicherheitsschalteinrichtung 112 elektrisch leitend mit einem Ansteuerausgang 176 der Rückholschaltung 114 verbunden. Im vorliegenden Ausführungsbeispiel ist der zweite Eingangsanschluss 168b mit dem ohmschen Widerstand 132 elektrisch leitend verbunden.Further, in the present embodiment, a second input terminal 168b of the safety switching device 112 is electrically connected to a drive output 176 of the return circuit 114. In the present exemplary embodiment, the second input terminal 168b is electrically conductively connected to the ohmic resistor 132.

Somit sind im vorliegenden Ausführungsbeispiel die Ansteuerschaltung 110 und die Rückholschaltung 114 parallel zueinander angeordnet. Sowohl der Ansteuerschaltung 110 als auch der Rückholschaltung 114 werden eingangsseitig über die jeweiligen Signaleingänge 152 166 das Freigabesignal F zugeführt. Ausgangsseitig sind sowohl die Ansteuerschaltung 110 als auch die Rückholschaltung 114 mit der Sicherheitsschalteinrichtung 112 über die jeweiligen Ansteuerausgänge 176, 178 mit dem ersten Eingangsanschluss 168a und zweiten Eingangsanschluss 168b elektrisch leitend verbunden.Thus, in the present embodiment, the drive circuit 110 and the return circuit 114 are arranged in parallel with each other. Both the drive circuit 110 and the return circuit 114 are the input side via the respective signal inputs 152 166, the enable signal F supplied. On the output side are both the Drive circuit 110 and the return circuit 114 to the safety switching device 112 via the respective drive outputs 176, 178 electrically connected to the first input terminal 168a and second input terminal 168b.

Die Rückholschaltung 114 weist im vorliegenden Ausführungsbeispiel einen Signaleingang 152 auf, der mit dem Freigabesignaleingang 106 der Schaltungsanordnung 100 elektrisch leitend verbunden ist. Ferner weist die Rückholschaltung 114 einen elektrischen Versorgungseingang 170 auf, mit dem die Rückholschaltung 114 mit dem Versorgungsanschluss 102 elektrisch leitend verbunden ist. Des Weiteren weist im vorliegenden Ausführungsbeispiel die Rückholschaltung 114 eine Transistorbaugruppe 136 auf, die im vorliegenden Ausführungsbeispiel einen Transistor 138, im vorliegenden Ausführungsbeispiel einen Bipolartransistor, sowie einen Spannungsteiler 140 mit einem ohmschen Widerstand 142 und einem ohmschen Widerstand 144 sowie eine Eingangsdiode 146 und einen ohmschen Eingangswiderstand 148 auf. Im vorliegenden Ausführungsbeispiel ist der Transistor 138 als NPN-Transistor ausgebildet.In the present exemplary embodiment, the return circuit 114 has a signal input 152, which is electrically conductively connected to the enable signal input 106 of the circuit arrangement 100. Furthermore, the return circuit 114 has an electrical supply input 170, with which the return circuit 114 is electrically conductively connected to the supply terminal 102. Furthermore, in the present exemplary embodiment, the return circuit 114 has a transistor assembly 136, which in the present embodiment, a transistor 138, in the present embodiment, a bipolar transistor, and a voltage divider 140 with an ohmic resistance 142 and a resistor 144 and an input diode 146 and an ohmic input resistance 148 on. In the present embodiment, the transistor 138 is formed as an NPN transistor.

Die Eingangsdiode 146 ist zwischen dem Signaleingang 152 der Rückholschaltung 114 und dem ohmschen Widerstand 142 des Spannungsteilers 140 angeordnet, der zur Versorgung der Basis des Transistors 138 dient. Zwischen dem Versorgungsanschluss 102 und dem Kollektor des Transistors 138 ist der ohmsche Eingangswiderstand 148 angeordnet, wobei im vorliegenden Ausführungsbeispiel zwischen dem ohmschen Eingangswiderstand 148 und dem Kollektor des Transistors 138 der Ansteuerausgang 176 der Rückholschaltung 114 angeordnet ist. Ferner ist sowohl der Emitter des Transistors 138 als auch der zweite ohmsche Widerstand 144 des Spannungsteilers 140 mit dem Masseanschluss 104 elektrisch leitend verbunden.The input diode 146 is arranged between the signal input 152 of the return circuit 114 and the ohmic resistor 142 of the voltage divider 140, which serves to supply the base of the transistor 138. Between the supply terminal 102 and the collector of the transistor 138, the ohmic input resistance 148 is arranged, wherein in the present embodiment between the ohmic input resistance 148 and the collector of the transistor 138, the drive output 176 of the return circuit 114 is arranged. Furthermore, both the emitter of the transistor 138 and the second ohmic resistor 144 of the voltage divider 140 to the ground terminal 104 is electrically connected.

Wenn im Betrieb ein Freigabesignal F an dem Freigabesignaleingang 106 anliegt, wird die Kollektor-Emitter-Strecke des Transistors 156 der Ansteuerschaltung 110 elektrisch leitend. In Folge fließt ein elektrischer Strom von dem Versorgungsanschluss 102 durch die Erregerspule 118 zu dem Masseanschluss 104. Ferner bewirkt das Freigabesignal F, dass die Kollektor-Emitter-Strecke des Transistors 138 der Rückholschaltung 114 elektrisch leitend wird. Somit fließt ein elektrischer Strom von dem Versorgungsanschluss 102 durch den ohmschen Eingangswiderstand 148 der Rückholschaltung 114 und der Kollektor-Emitter-Strecke des Transistors 138 zu dem Masseanschluss 104. Daher ist die Kollektor-Emitter-Strecke des Transistors 128 der Sicherheitsschalteinrichtung 112 elektrisch nicht leitend, so dass sich die Sicherheitsschalteinrichtung 112 in einem ersten Schaltzustand befindet, in dem die Erregerspule 118 elektrisch kurzgeschlossen ist und die Relaisbaugruppe 108 somit freigegeben ist.In operation, when an enable signal F is applied to the enable signal input 106, the collector-emitter path of the transistor 156 of the drive circuit 110 becomes electrically conductive. In turn, an electric current flows from the supply terminal 102 through the excitation coil 118 to the ground terminal 104. Further, the enable signal F causes the collector-emitter path of the transistor 138 of the return circuit 114 to become electrically conductive. Thus, an electric current flows from the supply terminal 102 through the resistive input resistance 148 of the return circuit 114 and the Therefore, the collector-emitter path of the transistor 128 of the safety switching device 112 is electrically non-conductive, so that the safety switching device 112 is in a first switching state in which the exciter coil 118 is electrically short-circuited is and the relay module 108 is thus enabled.

Wenn hingegen kein Freigabesignal F an dem Freigabesignaleingang 106 anliegt, ist in der Folge die Kollektor-Emitter-Strecke des Transistors 156 der Ansteuerschaltung 110 nicht mehr elektrisch leitend, so dass die Kollektor-Emitter-Strecke des Transistors 128 der Sicherheitsschalteinrichtung 112 elektrisch leitend wird. Daher befindet sich nun die Sicherheitsschalteinrichtung 112 in einem Schaltzustand, in dem der elektrische Stromkreis 180 elektrisch kurzgeschlossen ist. Die im vorliegenden Ausführungsbeispiel vorgesehene Strombegrenzungsbaugruppe 116 stellt dabei sicher, dass in der Sicherheitsschaltung 100 keine elektrischen Ströme mit Stromstärken auftreten, die zu einer Beschädigung von Bauteilen der Sicherheitsschaltung 100 durch Überlastung führen können.If, on the other hand, no enable signal F is present at the enable signal input 106, the collector-emitter path of the transistor 156 of the drive circuit 110 is no longer electrically conductive, so that the collector-emitter path of the transistor 128 of the safety switching device 112 becomes electrically conductive. Therefore, the safety switching device 112 is now in a switching state in which the electric circuit 180 is electrically short-circuited. The current limiting assembly 116 provided in the present embodiment ensures that no electrical currents with current intensities occur in the safety circuit 100, which can lead to damage of components of the safety circuit 100 due to overloading.

Somit schließt im vorliegenden Ausführungsbeispiel der Transistor 128 der Sicherheitsschalteinrichtung 112 die Erregerspule 118 der Relaisbaugruppe 108 so lange kurz, solange kein Freigabesignal F am Freigabesignaleingang 106 anliegt. Dadurch kann die Relaisbaugruppe 108 nicht mehr freigegeben werden. Der Transistor 138 der Rückholschaltung 114 bewirkt ein Deaktivieren des Transistors 128 der Sicherheitsschalteinrichtung 112, so dass der Stromkreis 180 geöffnet wird und damit der elektrische Kurzschluss aufgehoben ist.Thus, in the present embodiment, the transistor 128 of the safety switching device 112 short-circuits the excitation coil 118 of the relay module 108 as long as no enable signal F is present at the enable signal input 106. As a result, the relay assembly 108 can not be released. The transistor 138 of the return circuit 114 causes a deactivation of the transistor 128 of the safety switching device 112, so that the circuit 180 is opened and thus the electrical short circuit is canceled.

BEZUGSZEICHENLISTELIST OF REFERENCE NUMBERS

100100
Schaltungsanordnungcircuitry
102102
Versorgungsanschlusssupply terminal
104104
Masseanschlussground connection
106106
FreigabesignaleingangEnable signal input
108108
Relaisbaugrupperelay module
110110
Ansteuerschaltungdrive circuit
112112
SicherheitsschalteinrichtungSafety switching device
114114
Rückholschaltungretract
116116
StrombegrenzungsbaugruppeCurrent limiting assembly
118118
Erregerspuleexcitation coil
120120
FreilaufdiodeFreewheeling diode
122122
erster Erregerspulenanschlussfirst excitation coil connection
124124
zweiter Erregerspulenanschlusssecond excitation coil connection
126126
Transistorbaugruppetransistor package
128128
Transistortransistor
130130
Spannungsteilervoltage divider
132132
ohmscher Widerstandohmic resistance
134134
ohmscher Widerstandohmic resistance
136136
Transistorbaugruppetransistor package
138138
Transistortransistor
140140
Spannungsteilervoltage divider
142142
ohmscher Widerstandohmic resistance
144144
ohmscher Widerstandohmic resistance
146146
Eingangsdiodeinput diode
148148
Eingangswiderstandinput resistance
150150
Eingangswiderstandinput resistance
152152
Signaleingangsignal input
154154
Transistorbaugruppetransistor package
156156
Transistortransistor
158158
Spannungsteilervoltage divider
160160
ohmscher Widerstandohmic resistance
162162
ohmscher Widerstandohmic resistance
164164
Eingangsdiodeinput diode
166166
Signaleingangsignal input
168a168a
erster Eingangsanschlussfirst input connection
168b168b
zweiter Eingangsanschlusssecond input connection
170170
Versorgungseingangsupply input
172172
erster Anschlussfirst connection
174174
zweiter Anschlusssecond connection
176176
Ansteuerausgangtrigger output
178178
Ansteuerausgangtrigger output
180180
elektrischer Stromkreiselectrical circuit
FF
Freigabesignalenable signal

Claims (9)

  1. A circuit arrangement (100) having a relay module (108) with an exciter coil (118) and a safety switching device (112), wherein an electrical circuit (180) comprising at least the exciter coil (118) is electrically short-circuited in a first switching state of the safety switching device (112) and the electrical circuit (180) comprising at least the exciter coil (118) is electrically isolated in a second switching state of the safety switching device (112), characterized in that the circuit arrangement (100) comprises an enable signal input (106) for an enable signal (F) which is connected in an electrically conductive manner to a signal input (152) of a return circuit (114), wherein the return circuit (114) is electrically connected to the safety switching device (112) in order to effect a change from the second switching state into the first switching state.
  2. The circuit arrangement (100) according to claim 1, wherein the exciter coil (118) comprises a first exciter coil connector (122) and a second exciter coil connector (124) and the safety switching device (112) comprises a first connector (172) and a second connector (174), wherein the first connector (172) is connected in an electrically conductive manner to the first exciter coil connector (122) and the second connector (174) is connected in an electrically conductive manner to the second exciter coil connector (124) in order to electrically short-circuit the electrical circuit (180) in the second switching state.
  3. The circuit arrangement (100) according to claim 1 or 2, wherein the safety switching device (112) comprises a transistor module (126).
  4. The circuit arrangement (100) according to any one of the preceding claims, wherein the circuit arrangement (100) comprises an enable signal input (106) for an enable signal (F) which is connected in an electrically conductive manner to a signal input (166) of a control circuit (110), wherein the control circuit (110) is connected in an electrically conductive manner to the relay module (108) for controlling said relay module (108).
  5. The circuit arrangement (100) according to claim 4, wherein the safety switching device (112) comprises an input connector (168a) which is electro-conductively connected to a control output (176) of the control circuit (110).
  6. The circuit arrangement (100) according to any one of the preceding claims, wherein the return circuit (114) comprises a transistor module (136).
  7. The circuit arrangement (100) according to any one of the preceding claims, wherein the safety switching device (112) comprises an input connector (168b) which is connected in an electrically conductive manner to a control output (178) of the return circuit (114).
  8. The circuit arrangement (100) according to any one of the preceding claims, wherein a current-limiting module (116) is electrically arranged in series to the exciter coil (118).
  9. A safety switching device (112) for a circuit arrangement (100) in accordance with any one of the preceding claims.
EP14153170.7A 2013-03-04 2014-01-30 Switching assembly Active EP2775500B1 (en)

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Publication number Priority date Publication date Assignee Title
CN115473206B (en) * 2022-09-21 2025-02-21 东风电子科技股份有限公司 Short-circuit protection circuit of high-side driving relay coil

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Publication number Priority date Publication date Assignee Title
GB190903192A (en) * 1909-02-09 1910-01-27 British Thomson Houston Co Ltd Improvements in and relating to Protective Devices for Power Transmission Systems.
US5055962A (en) * 1989-02-21 1991-10-08 Digital Appliance Controls, Inc. Relay actuation circuitry
DE10048188A1 (en) 2000-09-28 2002-04-11 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Self-locking circuit arrangement
DE102008028202A1 (en) 2008-06-09 2009-12-10 E.G.O. Elektro-Gerätebau GmbH Circuit for controlling an electrical consumer

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