EP0386300A1 - Circuit intégrable pour l'excitation d'un relais à courant continu - Google Patents

Circuit intégrable pour l'excitation d'un relais à courant continu Download PDF

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Publication number
EP0386300A1
EP0386300A1 EP89104348A EP89104348A EP0386300A1 EP 0386300 A1 EP0386300 A1 EP 0386300A1 EP 89104348 A EP89104348 A EP 89104348A EP 89104348 A EP89104348 A EP 89104348A EP 0386300 A1 EP0386300 A1 EP 0386300A1
Authority
EP
European Patent Office
Prior art keywords
relay
circuit
current
input
control circuit
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Withdrawn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
EP89104348A
Other languages
German (de)
English (en)
Inventor
Oskar Dipl.-Ing. Starke
Alois Dipl.-Ing. Biebl
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Priority to EP89104348A priority Critical patent/EP0386300A1/fr
Publication of EP0386300A1 publication Critical patent/EP0386300A1/fr
Withdrawn legal-status Critical Current

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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
    • H01H47/22—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
    • H01H47/325—Energising current supplied by semiconductor device by switching regulator

Definitions

  • a self-monitoring circuit is known from DE-0S 33 39 271, in which the series resistor is connected upstream of the relay by means of an auxiliary contact arranged in addition to the normally open contact. If the relay drops out, it is then directly connected to the DC voltage again, thus enabling it to be re-energized. In addition, a holding current limitation only occurs when the relay has actually picked up.
  • the disadvantage here is that the relay requires an additional contact, which means a higher manufacturing effort for the relay.
  • the object of the invention is a self-monitoring Specify circuitry for controlling a relay operated with DC voltage with little effort.
  • the control circuit of the relay 2 is coupled to the output of a current control circuit 6.
  • An evaluation circuit 7, which has two inputs, is connected upstream of the current control circuit 6. The two inputs are each led to one of the two poles of the normally open contact of relay 2, one pole being connected to an operating potential 4 via a first load 5 and the other pole being connected to ground 1 via a further load 3.
  • the evaluation circuit monitors the switching state of relay 2 by means of a voltage measurement.
  • the evaluation circuit accordingly determines the switching state, for example, by comparing the potentials occurring at the two poles with one another or by measuring the voltage between the two poles.
  • the evaluation circuit 7 now adjusts the current control circuit 6 so that when the normally open contact is open it emits a mean output current which is sufficient to attract the relay, while when the normally open contact is tightened the mean output current is reduced to a value which is sufficient to hold the relay 2 .
  • the current flowing in the control circuit of relay 2 is also regulated during the starting phase. This allows relays with a low response threshold to be used, which has the advantage that the relay can still be pulled and held when the operating voltage drops, but no damage to the relay is to be expected if overvoltages occur due to the regulation.
  • the current control 6 is designed, for example, analogously as a controlled current source or as a switching regulator, as shown in FIG. 2.
  • the relay 2 can be switched on and off on the one hand by switching the supply voltage on and off, which can also be the same as the operating voltage, and / or on the other hand in a configuration of the invention by a control input 8.
  • the control input 8 is routed to the evaluation circuit 7, which then switches the relay 2 accordingly via the current control 6.
  • the operating potential 4 can accordingly be connected to the load 3 connected to ground 1 via the switching contact of the relay 2.
  • the relay coil is on the one hand also connected to ground 1 and on the other hand connected to a positive supply potential 10 via the collector-emitter path of a pnp transistor 11 and an emitter resistor 12 as a current measuring device.
  • the emitter of transistor 11 is also connected to an input of first comparator 14, the other input of which is led to positive supply potential 10 via a controllable voltage source 13.
  • the base of transistor 11 is coupled to an AND gate 15, one input of which is connected to the output of a window comparator 18 and the other input of which is connected to the output of an RS flip-flop 16.
  • the reset input R of the flip-flop 16 is connected to the output of the first comparator 14 and the set input 5 to the output of a pulse generator 17.
  • the window comparator 18 is acted upon on the input side by a voltage divider, consisting of three resistors 19, 20, 21, which leads from the supply potential 10 to ground 1, for setting the window area, and by a reference voltage source 27, to which an input of a further comparator 22 is connected.
  • the other input of the second comparator 22, the output of which is provided to control the controllable voltage source 13, is connected to the pole of the normally open contact assigned to the load 3.
  • This entrance is in progress staltung the invention with a grounding Zener diode 23 and with a series connection to the input connected in series from a resistor 24 and a diode 25 in the forward direction to protect against incorrect polarity and overvoltage.
  • the collector of the transistor 11 forming the output of the circuit arrangement has a freewheeling diode 26 leading to ground in the reverse direction for commutation of the induction voltages generated by the relay coil.
  • the current regulation takes place according to the principle of clocked current regulation, that is to say as a switching regulator.
  • a switching regulator that is to say as a switching regulator.
  • the mode of operation is as follows: the pulse generator 17 sets the flip-flop 16, as a result of which the transistor 11 is switched on.
  • the current through the relay coil now rises until the limit value specified by the controllable voltage source 13 in connection with the emitter resistor 12 is reached and the first comparator 14 resets the flip-flop 16 again.
  • the current in the relay coil via the freewheeling diode 26 is maintained until the next set pulse of the pulse generator 17.
  • the interposition of the AND gate 15 in connection with the window comparator 18 serves to switch off the relay 2 in a defined manner when undervoltage or overvoltage occurs.
  • the second comparator 22 in connection with the reference voltage source 27 determines when the operating potential 4 is connected to the load 3 and thereupon changes the voltage of the controlled voltage source 13. This results in a lower limit value, which results in a lower average output current.
  • FIG. 3 shows the course of the current I flowing through the relay coil over time t.
  • the current I initially rises depending on the ohmic resistances and inductances in the control circuit until the limit value specified when the work contact is open is reached.
  • the relay coil is then separated from the supply potential 10 by the transistor 11 and switched on again after the pulse of the pulse generator has been set, etc.
  • the relay 2 has been energized, the current is reduced by changing the limit value.
  • the dashed line in FIG. 3 also shows the current profile of a known circuit without starting current control, which has a pronounced contact bounce when switching over compared to the circuit arrangement according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electronic Switches (AREA)
EP89104348A 1989-03-10 1989-03-10 Circuit intégrable pour l'excitation d'un relais à courant continu Withdrawn EP0386300A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP89104348A EP0386300A1 (fr) 1989-03-10 1989-03-10 Circuit intégrable pour l'excitation d'un relais à courant continu

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89104348A EP0386300A1 (fr) 1989-03-10 1989-03-10 Circuit intégrable pour l'excitation d'un relais à courant continu

Publications (1)

Publication Number Publication Date
EP0386300A1 true EP0386300A1 (fr) 1990-09-12

Family

ID=8201075

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89104348A Withdrawn EP0386300A1 (fr) 1989-03-10 1989-03-10 Circuit intégrable pour l'excitation d'un relais à courant continu

Country Status (1)

Country Link
EP (1) EP0386300A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0543030A1 (fr) * 1991-11-13 1993-05-26 Siemens Aktiengesellschaft Dispositif intégrable pour la commande d'un relais à courant continu
CN117080018A (zh) * 2023-09-27 2023-11-17 德力西电气有限公司 一种接触器线圈控制系统

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2513043A1 (de) * 1975-03-25 1976-10-07 Baum Elektrophysik Gmbh Schaltung zum gleichstrombetrieb fuer schuetze oder relais
EP0087583A1 (fr) * 1982-03-01 1983-09-07 International Business Machines Corporation Circuit intégré à puissance avec dispositif de mesure de courant
EP0136968A2 (fr) * 1983-09-30 1985-04-10 Siemens Aktiengesellschaft Dispositif de commande pour l'alimentation d'un électro-aimant par un courant d'appel suivi d'un courant de maintien
EP0242759A2 (fr) * 1986-04-22 1987-10-28 STMicroelectronics S.r.l. Limiteur de courant à courant constant pour un excitateur d'un circuit de commutation
EP0252808A1 (fr) * 1986-07-04 1988-01-13 Abb Control Dispositif de commande et de contrôle d'un contacteur et procédé de contrôle correspondant
EP0298718A2 (fr) * 1987-07-07 1989-01-11 Nec Corporation Circuit de relais ayant un générateur d'impulsion pour la fermeture des contacts

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2513043A1 (de) * 1975-03-25 1976-10-07 Baum Elektrophysik Gmbh Schaltung zum gleichstrombetrieb fuer schuetze oder relais
EP0087583A1 (fr) * 1982-03-01 1983-09-07 International Business Machines Corporation Circuit intégré à puissance avec dispositif de mesure de courant
EP0136968A2 (fr) * 1983-09-30 1985-04-10 Siemens Aktiengesellschaft Dispositif de commande pour l'alimentation d'un électro-aimant par un courant d'appel suivi d'un courant de maintien
EP0242759A2 (fr) * 1986-04-22 1987-10-28 STMicroelectronics S.r.l. Limiteur de courant à courant constant pour un excitateur d'un circuit de commutation
EP0252808A1 (fr) * 1986-07-04 1988-01-13 Abb Control Dispositif de commande et de contrôle d'un contacteur et procédé de contrôle correspondant
EP0298718A2 (fr) * 1987-07-07 1989-01-11 Nec Corporation Circuit de relais ayant un générateur d'impulsion pour la fermeture des contacts

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0543030A1 (fr) * 1991-11-13 1993-05-26 Siemens Aktiengesellschaft Dispositif intégrable pour la commande d'un relais à courant continu
CN117080018A (zh) * 2023-09-27 2023-11-17 德力西电气有限公司 一种接触器线圈控制系统
CN117080018B (zh) * 2023-09-27 2024-01-19 德力西电气有限公司 一种接触器线圈控制系统

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