EP1956621B1 - Relais-Einschaltkreis - Google Patents

Relais-Einschaltkreis Download PDF

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Publication number
EP1956621B1
EP1956621B1 EP20070290182 EP07290182A EP1956621B1 EP 1956621 B1 EP1956621 B1 EP 1956621B1 EP 20070290182 EP20070290182 EP 20070290182 EP 07290182 A EP07290182 A EP 07290182A EP 1956621 B1 EP1956621 B1 EP 1956621B1
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EP
European Patent Office
Prior art keywords
relay
terminal
circuit
switching
operating voltage
Prior art date
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EP20070290182
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English (en)
French (fr)
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EP1956621A1 (de
Inventor
Kassen Oldewurtel
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.)
Thales Security Solutions and Services GmbH
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Thales Security Solutions and Services GmbH
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Filing date
Publication date
Application filed by Thales Security Solutions and Services GmbH filed Critical Thales Security Solutions and Services GmbH
Priority to DE200760008354 priority Critical patent/DE602007008354D1/de
Priority to EP20070290182 priority patent/EP1956621B1/de
Publication of EP1956621A1 publication Critical patent/EP1956621A1/de
Application granted granted Critical
Publication of EP1956621B1 publication Critical patent/EP1956621B1/de
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Classifications

    • 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

Definitions

  • the present invention relates to a relay switching-on circuit, comprising: a relay having a first terminal and a second terminal; a first switching element connected between the first terminal and a first operating voltage; a second switching element connected between the second terminal and a second operating voltage, wherein said first and second switching elements are operatively connected with a respective control channel for controlling a respective switching action of said switching elements.
  • the above-described dual channel switching-on circuit for a relay has the disadvantage that faulty conditions of the switching elements, e.g., a short circuit, cannot be detected in a switched-off state of the relay. However, if such faults go unnoticed, e.g., if one switching element is defective, this may lead to a situation, in which the relay becomes switched on although only one of the switching elements is activated or in case the other switching element becomes defective, too.
  • a relay switching-on circuit comprising: a relay having a first terminal and a second terminal; a first switching element connected between the first terminal and a first operating voltage; a second switching element connected between the second terminal and a second operating voltage; wherein said first and second switching elements are operatively connected with a respective control channel for controlling a respective switching action of said switching elements, is characterised by a first resistor connected between said first operating voltage and one of said first and second terminals; a second resistor connected between said second operating voltage and the other one of said first and second terminals; and a comparator unit connected with said first and second terminals for comparing a potential at said first and second terminals with a respective reference potential in a switched-off state of the relay, wherein said comparator unit is configured to issue at least one fault disclosure signal in response to a relation between the potential at said first and/or second terminal and the corresponding reference potential.
  • the potential or a voltage at both terminals of the relay is monitored by means of the comparator unit, which may comprise two separate comparators, one for each terminal of the relay. If any one of the switching elements displays a faulty condition, the monitored voltage (or voltages) will differ from a state in which the switching elements do not display said faulty condition. If said difference or differences exceed a certain predetermined amount, this can be interpreted as a fault, and a corresponding fault disclosure signal can be issued to initiate a suitable security reaction.
  • At least one of said switching elements can be devised as a transistor, e.g. a bipolar transistor.
  • the present invention is not limited to such a configuration of the relay switching-on circuit.
  • any other suitable switching element for controlling relay operation could be used instead.
  • said first resistor is connected between said first operating voltage and said second terminal, and said second resistor is connected between said second operating voltage and said first terminal.
  • the first and second resistances may have the same resistance value.
  • the present invention is not limited to such an embodiment, provided that the reference potentials of the comparator unit are adapted accordingly.
  • a respective resistance of the first and second resistors is chosen so that a respective operating current through said first and second resistors is lower than a relay operating current through the relay in a switched-on state of the relay in order to ensure secure switching-off of the relay.
  • the resistances of first and second resistors may be chosen so that said operating current through said first and second resistors is lower than said relay operating current by a factor of 50 to 200, preferably 100.
  • the only figure shows a circuit diagram of a relay switching-on circuit in accordance with an embodiment of the present invention.
  • the figure shows a circuit diagram of a relay switching-on circuit in accordance with an embodiment of the present invention.
  • the relay switching-on circuit comprises a relay K1 having a first terminal K11 and a second terminal K12.
  • a first switching element in form of but not limited to a bipolar transistor T1 is connected between the first terminal K11 of the relay K1 and a first operating voltage +VCC.
  • a second switching element in the form of a bipolar transistor T2 is connected between the second terminal K12 of the relay K1 and a second operating voltage -VCC which - in the present exemplary embodiment - has the same absolute-valued magnitude as the first operating voltage +VCC.
  • the transistors T1, T2 are operatively connected with a respective control channel CH1, CH2 by means of their respective gate terminals. In this way, a respective switching action of the transistors T1, T2 can be controlled by means of control signals on said control channels CH 1, CH2.
  • relay switching-on circuit As known to a person skilled in the art, simultaneously switching on the transistors T1, T2 by means of corresponding control signals on control channels CH1, CH2 will result in an activation of relay K1.
  • the relay switching-on circuit In order to limit a voltage peak when switching off relay K1 the relay switching-on circuit further comprises a diode D1 connected in parallel with relay K1.
  • the exemplary embodiment of the relay switching-on circuit in accordance with the present invention further comprises a first resistor R1 connected between the first operating voltage +VCC and one of said first and second terminals K11, K12 of relay K1, i.e., said second terminal K12 in the context of the embodiment shown.
  • the exemplary relay switching-on circuit comprises a second resistor R2 connected between the second operating voltage -VCC and the other one of said first and second terminals K11, K12 of relay K1, i.e., the first terminal K11 in the context of the shown embodiment.
  • the exemplary relay switching-on circuit comprises a comparator unit CU including two comparators COMP1, COMP2. One input of the first comparator COMP1 is connected with the first terminal K11 of relay K1. One input of the second comparator COMP2 is connected with the second terminal K12 of relay K1. Other inputs of the first and second comparators COMP1, COMP2 are connected with corresponding reference potentials UREF1, UREF2.
  • a faulty condition of any one of transistors T1, T2 can thus be detected in a switched-off state of relay K1 by means of the corresponding comparator COMP1, COMP2.
  • Said comparator COMP1, COMP2 then produces a corresponding fault detection signal or fault disclosure signal FDS1, FDS2, which can be used for signalling a corresponding faulty condition of any one of transistors T1. T2.
  • terminal K11 will not be at U/2 in a switched-off state of relay K1.
  • This faulty condition will be indicated by means of fault detection signal FDS1 from comparator COMP1. In this way, the faulty condition can be detected and transistor T1 can be replaced prior to complete operational failure of the relay switching-on circuit, i.e., failure of second transistor T2.
  • first and second resistors R1, R2 can be neglected when turning on transistors T1, T2. In other words: They have no negative effect on the operation of the relay switching-on circuit.
  • the relay switching-on circuit described herein is not only adapted to detect short circuits of transistors T1, T2 but can be configured to detect any kind of faulty condition of switching elements used for switching on and off relay K1.

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

Claims (7)

  1. Relaisanschaltung, umfassend:
    ein Relais (K1) mit einem ersten Anschluss (K11) und einem zweiten Anschluss (K12);
    ein erstes Schaltelement (T1), das zwischen dem ersten Anschluss und
    einer ersten Betriebsspannung (+VCC) verbunden ist;
    ein zweites Schaltelement (T2), das zwischen dem zweiten Anschluss und
    einer zweiten Betriebsspannung (-VCC) verbunden ist;
    wobei das erste und zweite Schaltelement mit einem jeweiligen Steuerkanal (CH1, CH2) wirkverbunden sind, um eine jeweilige Schaltaktion der Schaltelemente zu steuern;
    gekennzeichnet durch
    einen ersten Widerstand (R1), der zwischen der ersten Betriebsspannung und dem ersten oder zweiten Anschluss verbunden ist;
    einen zweiten Widerstand (R2), der zwischen der zweiten Betriebsspannung und dem jeweils anderen ersten oder zweiten Anschluss verbunden ist; und
    eine Komparatoreinheit (CU), die mit dem ersten und zweiten Anschluss verbunden ist, um ein Potential an dem ersten und zweiten Anschluss mit einem jeweiligen Referenzpotential (UREF1, UREF2) in einem abgeschalteten Zustand des Relais zu vergleichen, wobei die Komparatoreinheit so ausgebildet ist, dass sie mindestens ein Fehleroffenbarungssignal (FDS1, FDS2) in Reaktion auf einen Bezug zwischen dem Potential an dem ersten und/oder zweiten Anschluss und dem entsprechenden Referenzpotential auszugeben.
  2. Schaltung nach Anspruch 1, dadurch gekennzeichnet, dass die Komparatoreinheit (CU) so ausgebildet ist, dass sie das mindestens eine Fehleroffenbarungssignal (FDS1, FDS2) ausgibt, wenn das Potential an dem ersten und/oder zweiten Anschluss (K11, K12) sich von dem entsprechenden Referenzpotential (UREF1, UREF2) um mindestens einen vorbestimmten Betrag unterscheidet.
  3. Schaltung nach Anspruch 1, dadurch gekennzeichnet, dass das erste und/oder zweite Schaltelement (T1, T2) als Transistor ausgebildet ist bzw. sind.
  4. Schaltung nach Anspruch 1, dadurch gekennzeichnet, dass die Komparatoreinheit (CU) einen ersten Komparator (COMP1) und einen zweiten Komparator (COMP2) umfasst, wobei der erste Komparator das Potential an dem ersten Anschluss (K11) mit dem entsprechenden Referenzpotential (UREF1) vergleicht und ein erstes Fehleroffenbarungssignal (FDS1) ausgibt und der zweite Komparator (COMP2) das Potential an dem zweiten Anschluss (K12) mit dem entsprechenden Referenzpotential (UREF2) vergleicht und ein zweites Fehleroffenbarungssignal (FDS2) ausgibt.
  5. Schaltung nach Anspruch 1, dadurch gekennzeichnet, dass ein jeweiliger Widerstand des ersten und zweiten Widerstands (R1, R2) so gewählt wird, dass ein jeweiliger Betriebsstrom durch den ersten und zweiten Widerstand kleiner ist als der kleinste Relais-Betriebsstrom durch das Relais (K1) in einem angeschalteten Zustand des Relais, um ein sicheres Abschalten des Relais sicherzustellen.
  6. Schaltung nach Anspruch 1, dadurch gekennzeichnet, dass der erste Widerstand (R1) zwischen der ersten Betriebsspannung (+VCC) und dem zweiten Anschluss (K12) verbunden ist und dass der zweite Widerstand (R2) zwischen dem zweiten Betriebsstrom (-VCC) und dem ersten Anschluss (K11) verbunden ist.
  7. Schaltung nach Anspruch 6, dadurch gekennzeichnet, dass ein jeweiliger Widerstand des ersten und zweiten Widerstands (R1, R2) so gewählt wird, dass im abgeschalteten Zustand des Relais ein kleiner Sperrstrom in Bezug auf einen Relais-Betriebsstrom durch das Relais (K1) fließt.
EP20070290182 2007-02-12 2007-02-12 Relais-Einschaltkreis Active EP1956621B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE200760008354 DE602007008354D1 (de) 2007-02-12 2007-02-12 Relais-Einschaltkreis
EP20070290182 EP1956621B1 (de) 2007-02-12 2007-02-12 Relais-Einschaltkreis

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20070290182 EP1956621B1 (de) 2007-02-12 2007-02-12 Relais-Einschaltkreis

Publications (2)

Publication Number Publication Date
EP1956621A1 EP1956621A1 (de) 2008-08-13
EP1956621B1 true EP1956621B1 (de) 2010-08-11

Family

ID=38171273

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070290182 Active EP1956621B1 (de) 2007-02-12 2007-02-12 Relais-Einschaltkreis

Country Status (2)

Country Link
EP (1) EP1956621B1 (de)
DE (1) DE602007008354D1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL109531C (de) * 1959-07-08
US5210756A (en) * 1990-09-26 1993-05-11 Honeywell Inc. Fault detection in relay drive circuits
JPH08250000A (ja) * 1995-03-14 1996-09-27 Mitsubishi Electric Corp ラッチングリレー切替回路
RU2191467C2 (ru) * 2001-01-16 2002-10-20 Райнин Валерий Ефимович Устройство управления автоматического выключателя, управляемого дифференциальным током

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EP1956621A1 (de) 2008-08-13
DE602007008354D1 (de) 2010-09-23

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