EP0776017A2 - Dispositif pour le raccordement fiable et permanent d'une paire de contacts d'un dispositif de commutation électromécanique - Google Patents

Dispositif pour le raccordement fiable et permanent d'une paire de contacts d'un dispositif de commutation électromécanique Download PDF

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Publication number
EP0776017A2
EP0776017A2 EP96250265A EP96250265A EP0776017A2 EP 0776017 A2 EP0776017 A2 EP 0776017A2 EP 96250265 A EP96250265 A EP 96250265A EP 96250265 A EP96250265 A EP 96250265A EP 0776017 A2 EP0776017 A2 EP 0776017A2
Authority
EP
European Patent Office
Prior art keywords
evaluation circuit
switch contact
input
contact device
operating voltage
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.)
Withdrawn
Application number
EP96250265A
Other languages
German (de)
English (en)
Other versions
EP0776017A3 (fr
Inventor
Andreas Kruschinski
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
Publication of EP0776017A2 publication Critical patent/EP0776017A2/fr
Publication of EP0776017A3 publication Critical patent/EP0776017A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/60—Auxiliary means structurally associated with the switch for cleaning or lubricating contact-making surfaces
    • H01H1/605—Cleaning of contact-making surfaces by relatively high voltage pulses

Definitions

  • the invention relates to an arrangement for the permanently reliable connection of a contact set of an electromechanical switch contact device to an input of a power-limited evaluation circuit for binary information.
  • Such contact sets of electromechanical switch contact devices belong systematically to the group of binary sensors.
  • Sensor or actuator is directly connected to a processing device designed as a user-specific integrated circuit, so-called ASIC (applicant specific integrated circuit), which is accommodated in an SMD housing (surface mounted device) and has an evaluation circuit for sensors and a driver circuit for actuators .
  • ASIC appliance specific integrated circuit
  • the power supply for each connected actuator / sensor is limited to 5 mA for thermal reasons, as is known from the technical device pass for the ASI module upper part 3RG9001-0AG00 from Siemens.
  • the limited current strength means that, in particular in the case of contact sets of electromechanical switch contact devices acting as sensors, such as those used as robust limit switches in mechanical engineering facilities, the self-cleaning effect does not occur in the absence of sufficient current strength, so that after a short operating time the contact transmission resistance between the Contacts of a contact set increases to such an extent that it is no longer possible to clearly identify whether the contacts are open or closed.
  • the invention is therefore based on the object of improving an arrangement with a contact set, acting as a sensor, of an electromechanical switch contact device on an ASI evaluation circuit in such a way that permanent operational reliability is ensured.
  • the essence of the invention is to impress the contact set of the electromechanical switch contact device with a current that is independent of the ASI evaluation circuit and that can be adapted to the special properties of the switch contact device.
  • a previously known, available ASI evaluation circuit with a predetermined current limitation can also be used in connection with switching contact devices which require a minimum current for self-cleaning, which is above the current limitation of the ASI evaluation circuit.
  • FIG. 1 a basic circuit diagram is shown in Figure 1 with the switching means essential to the invention.
  • An evaluation circuit 1 is connected to a first operating voltage connection 2 and a second operating voltage connection 3 and has an input 11 and an output 12.
  • An operating voltage source not shown, is connected to the first and second operating voltage connections 2 and 3.
  • a switch contact device 4 is shown, which has a switchable contact set, the switching state of monitor is.
  • the state of the contact set of the switch contact device 4 can be tapped as a logic level at the output 12 of the evaluation circuit 1.
  • This switch contact device is designed as a limit switch in mechanical engineering devices.
  • the set of contacts of the switch contact device 4 to be monitored is connected between the first operating voltage connection 2 and the input 11 of the evaluation circuit 1.
  • a current source 5 is also provided, which is connected in series with the contact set of the switching contact device 4 between the first operating voltage connection 2 and the second operating voltage connection 3.
  • the current source is connected between the input 11 of the evaluation circuit 1 and the second operating voltage connection 3.
  • a current flows through the contact set, which is additively composed of the input current of the evaluation circuit 1 at the input 11 and the current through the current source 5.
  • the input current of the evaluation circuit 1 at the input 11 is limited by the system.
  • the source current of the current source 5 is adjustable so that the total current through the contact set of the switch contact device 4 in the closed state at least reaches the known and required for the specially used switch contact to achieve the self-cleaning effect.
  • the potential at the input 11 of the evaluation circuit 1 is substantially equal to the potential at the second operating voltage connection 3, so that the current source 5 has no effect on the evaluation circuit 1.
  • the advantage of the invention can be seen in particular in the fact that the complex design of a special evaluation circuit 1 for the actuator-sensor interface ASI for special properties of switch contact devices 4 is avoided.

Landscapes

  • Keying Circuit Devices (AREA)
EP96250265A 1995-11-24 1996-11-21 Dispositif pour le raccordement fiable et permanent d'une paire de contacts d'un dispositif de commutation électromécanique Withdrawn EP0776017A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1995145254 DE19545254C2 (de) 1995-11-24 1995-11-24 Anordnung zur dauerhaft betriebssicheren Anschaltung eines Kontaktsatzes einer elektromechanischen Schaltkontakteinrichtung
DE19545254 1995-11-24

Publications (2)

Publication Number Publication Date
EP0776017A2 true EP0776017A2 (fr) 1997-05-28
EP0776017A3 EP0776017A3 (fr) 1998-07-29

Family

ID=7779179

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96250265A Withdrawn EP0776017A3 (fr) 1995-11-24 1996-11-21 Dispositif pour le raccordement fiable et permanent d'une paire de contacts d'un dispositif de commutation électromécanique

Country Status (2)

Country Link
EP (1) EP0776017A3 (fr)
DE (1) DE19545254C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016073004A (ja) * 2014-09-26 2016-05-09 三菱電機株式会社 保護継電装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012207592A1 (de) * 2012-05-08 2013-11-14 Robert Bosch Gmbh Automatische Reinigung von mechanischen Kontakten
DE102015016992B4 (de) 2015-12-24 2017-09-28 Audi Ag Verfahren zum Reinigen elektrischer Kontakte einer elektrischen Schalteinrichtung und Kraftfahrzeug

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1154554B (de) * 1962-02-23 1963-09-19 Licentia Gmbh Anordnung zur Erzielung einer zuverlaessigen Kontaktgabe bei einer mechanischen Kontaktanordnung
DE3228686A1 (de) * 1982-07-31 1984-02-02 Edmund 7016 Gerlingen Zottnik Verfahren und vorrichtung zur erfassung von sdchalterstellungen
DE4015271A1 (de) * 1990-05-12 1991-11-14 Vdo Schindling Schaltungsanordnung zur abfrage von schalterstellungen
DE4318188A1 (de) * 1993-06-01 1994-12-08 Abb Management Ag Vorrichtung zur Überwachung einer Schalterstellung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016073004A (ja) * 2014-09-26 2016-05-09 三菱電機株式会社 保護継電装置

Also Published As

Publication number Publication date
EP0776017A3 (fr) 1998-07-29
DE19545254C2 (de) 2000-09-07
DE19545254A1 (de) 1997-05-28

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