EP0387729B1 - Electronic control for contactor - Google Patents

Electronic control for contactor Download PDF

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Publication number
EP0387729B1
EP0387729B1 EP90104583A EP90104583A EP0387729B1 EP 0387729 B1 EP0387729 B1 EP 0387729B1 EP 90104583 A EP90104583 A EP 90104583A EP 90104583 A EP90104583 A EP 90104583A EP 0387729 B1 EP0387729 B1 EP 0387729B1
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EP
European Patent Office
Prior art keywords
current
voltage
switch
supply voltage
contactor
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.)
Expired - Lifetime
Application number
EP90104583A
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German (de)
French (fr)
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EP0387729A2 (en
EP0387729A3 (en
Inventor
Herbert Dr. Meyer
Thomas Balow
Zoltan Giday
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Licentia Patent Verwaltungs GmbH
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Licentia Patent Verwaltungs GmbH
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Publication of EP0387729A2 publication Critical patent/EP0387729A2/en
Publication of EP0387729A3 publication Critical patent/EP0387729A3/en
Application granted granted Critical
Publication of EP0387729B1 publication Critical patent/EP0387729B1/en
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Expired - Lifetime 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

  • the invention relates to an electronic contactor control according to the preamble of claim 1 (see, for example, "EDN ELECTRICAL DESIGN NEWS", vol. 31, n ° 13, June 26, 1986, "Sense-cell MOSFET eliminates losses in source circuit", p.176, Fig. 8).
  • the z. B. are used as tapping magnets in type wheel printers, lifting magnets or in solenoid valves, the use of special ICs is known.
  • a special IC is e.g. B. the controller block L5832 from SGS, which is described in the "Databuch" of this company from December 1986.
  • the module enables clocked current control of the inrush current of actuators, its driver output being used for the basic control of a Darlington transistor, which is used as an actuator in the current control circuit.
  • the actual value of the inrush current is recorded via a low-resistance measuring resistor, the measuring input being limited to a voltage signal of 450 mV.
  • the block switches the operating current to the holding current, which is not regulated in contrast to the inrush current.
  • the inrush current timer of the block is only started when the operating current has exceeded the specified inrush current value.
  • the invention has for its object to provide a control with high current and voltage capacity and to ensure low-loss and accurate current measurement for the actual value detection of the control loop and a defined, reliable switching.
  • the regulation of the switch-on and the holding current advantageously improves the efficiency of the contactor control. Furthermore, the timer is started regardless of the level of the inrush current, which increases the safety of the contactor control.
  • the conventional controller module L 5832 namely starts the inrush current timer only after the inrush current has reached its predetermined value. If the specified inrush current were not reached, the module would not switch to holding current and the semiconductor components would be thermally destroyed by the high continuous current.
  • Another advantage lies in the use of a threshold switch controlled by the input voltage in the input of the contactor control, with which a flutter of the Contactor due to undefined switching on and off is avoided.
  • the circuit diagram shows an electronic contactor control with a power FET for two current setpoints with changeover switch, time control and threshold switch.
  • the contactor control is supplied with a supply voltage at input terminal 1.
  • the current through the contactor coil 2 is clocked with the integrated power semiconductor circuit 3 for the purpose of current regulation. So that the contactor does not drop out in the switching-off phases of the clocking, a freewheeling circuit with a diode 13, which is known for the operation of direct current contactors, is provided.
  • the current control requires a measurement of the current flowing through the contactor coil.
  • the measurement output 6 of the integrated power semiconductor circuit 3 is used for this purpose.
  • a HEXSense module from International Rectifier is used as circuit 3. Around 1600 MOSFETs are connected in parallel in this module. The current is divided evenly between the individual MOSFETs. The source connection of a MOSFET is led to the outside with an extra connection, the measuring output 6.
  • the exact ratio of the number of MOSFETs to the measuring MOSFET is specified by the manufacturer with a scale factor assigned to the respective module.
  • the current of the measuring output 6 is converted with an operational amplifier 8 into a voltage which is applied to the negative input of a comparator 10.
  • the output signal of a reference voltage transmitter 14 is connected to the positive input of this comparator 10. If the actual value voltage for the contactor current is greater than the reference voltage, the output of the comparator flips up from a positive voltage value OV and thus starts the switch-off timer 12, which controls the switch-off phases of the current clocking.
  • the reference voltage generator 14 To control both the inrush and the holding current of a contactor, two different reference voltages are provided by the reference voltage generator 14: a reference voltage which is higher in the voltage value for the brief inrush current and a lower reference voltage in the voltage value for the holding current of the contactor.
  • the reference values are switched using an electronic switch 15, which is controlled by an electronic timer 16 and which successively switches the reference voltages to the comparator 10.
  • the timer 16 starts immediately when the supply voltage is present with the inrush phase.
  • the presence of the supply voltage is checked with an electronic threshold switch 17, which is arranged in the input of the contactor control. If the supply voltage has not exceeded a defined switch-on threshold, then the start of the timer 16 is prevented.
  • the threshold switch 17 also controls the switching off of the contactor control. If the supply voltage drops below a specified switch-off threshold, then there is no reference voltage at the comparator 10 and the semiconductor circuit 3 is blocked. With the threshold switch 17, a defined switching on and off of the contactor is achieved and the fluttering of the contactor is avoided.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electronic Switches (AREA)
  • Control Of Voltage And Current In General (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Relay Circuits (AREA)
  • Dc-Dc Converters (AREA)

Description

Die Erfindung betrifft eine elektronische Schützansteuerung gemäß dem Oberbegriff des Anspruchs 1 (siehe z.B. "EDN ELECTRICAL DESIGN NEWS", vol. 31, n° 13, 26 Juni 1986, "Sense-cell MOSFET eliminates losses in source circuit", p.176, Fig. 8).The invention relates to an electronic contactor control according to the preamble of claim 1 (see, for example, "EDN ELECTRICAL DESIGN NEWS", vol. 31, n ° 13, June 26, 1986, "Sense-cell MOSFET eliminates losses in source circuit", p.176, Fig. 8).

Für die Ansteuerung von elektromagnetischen Aktuatoren, die z. B. als Abschlagmagnete in Typenraddruckern, Hubmagnete oder in Magnetventilen eingesetzt werden, ist die Verwendung von Special-IC's, bekannt. Ein solcher Special-IC ist z. B. der Controller-Baustein L5832 der Firma SGS, der in dem "Databuch" dieser Firma vom Dezember 1986 beschrieben ist. Der Baustein ermöglicht eine getaktete Stromregelung des Einschaltstromes von Aktuatoren, wobei sein Treiberausgang für die Basisansteuerung eines Darlingtontransistors verwendet wird, der als Stellglied in dem Stromregelkreis eingesetzt ist. Die Istwerterfassung des Einschaltstromes erfolgt dabei über einen niederohmigen Meßwiderstand, wobei der Meßeingang auf ein Spannungssignal von 450 mV begrenzt ist. Nach Ablauf einer einstellbaren Einschaltstromdauer schaltet der Baustein den Betriebsstrom auf den Haltestrom um, der im Gegensatz zum Einschaltstrom nicht geregelt ist. Der Einschaltstromzeitgeber des Bausteins wird erst gestartet, wenn der Betriebsstrom den vorgegebenen Einschaltstromwert überschritten hat.For the control of electromagnetic actuators, the z. B. are used as tapping magnets in type wheel printers, lifting magnets or in solenoid valves, the use of special ICs is known. Such a special IC is e.g. B. the controller block L5832 from SGS, which is described in the "Databuch" of this company from December 1986. The module enables clocked current control of the inrush current of actuators, its driver output being used for the basic control of a Darlington transistor, which is used as an actuator in the current control circuit. The actual value of the inrush current is recorded via a low-resistance measuring resistor, the measuring input being limited to a voltage signal of 450 mV. After an adjustable inrush current has elapsed, the block switches the operating current to the holding current, which is not regulated in contrast to the inrush current. The inrush current timer of the block is only started when the operating current has exceeded the specified inrush current value.

Aus der US-A- 4 453 194 ist ein integrierter, bipolarer Schaltkreis bekannt, bei dem zur Strommessung ein Bruchteil des Gesamtstromes abgezweigt und über einen Messtransistor mit einem Strom-Spannungsumsetzer verbunden ist. Das entsprechend erzeugte Signal des Strom-Spannungsumsetzers steuert die zur Stromregelung verwendete Schaltung. Der bipolaren Technik haftet der Nachteil einer begrenzten Betriebsspannung an, die für in Niederspannungsnetzen übliche Größenordnungen nicht ausreicht.From US-A-4 453 194 an integrated, bipolar circuit is known in which a fraction of the total current is branched off for current measurement and is connected to a current-voltage converter via a measuring transistor. The correspondingly generated signal of the current-voltage converter controls the circuit used for current regulation. Bipolar technology suffers from the disadvantage of a limited operating voltage, which is not sufficient for orders of magnitude customary in low-voltage networks.

Der Erfindung liegt die Aufgabe zugrunde, eine Ansteuerung mit hoher Strom- und Spannungsbelastbarkeit zu schaffen und eine verlustarme und genaue Strommessung für die Istwerterfassung des Regelkreises zu gewährleisten sowie eine definierte, betriebssichere Einschaltung.The invention has for its object to provide a control with high current and voltage capacity and to ensure low-loss and accurate current measurement for the actual value detection of the control loop and a defined, reliable switching.

Diese Aufgabe wird erfindungsgemäß durch die im Anspruch 1 angegebenen Merkmale gelöst.This object is achieved by the features specified in claim 1.

Die Erfindung hat den Vorteil, daß größere Ströme als bei Verwendung des- Kontrollerbausteines L 5832 geregelt werden können, da der Meßeingang 3 dieses Bausteines den Einschaltstrom auf IP=0.45/Rs begrenzt. Da Meßwiderstände mit einem geringeren Wert als 0,1 Ω mit vertretbarem Aufwand nicht eingesetzt werden können, ist damit der maximal mit dem Baustein regelbare Strom auf etwa 4A begrenzt. Neben der höheren Strombelastbarkeit bietet die erfindungsgemäße Lösung noch den Vorteil, daß auf den teuren niederohmigen Meßwiderstand verzichtet werden kann, der neben dem Preisnachteil auch mit einer schwierigen Liefersituation behaftet ist und dadurch Probleme bei der Fertigung bereiten kann.The invention has the advantage that larger currents can be regulated than when using the L 5832 controller module, since the measurement input 3 of this module limits the inrush current to I P = 0.45 / R s . Since measuring resistors with a value lower than 0.1 Ω cannot be used with reasonable effort, the maximum current that can be regulated with the module is limited to approximately 4A. In addition to the higher current carrying capacity, the solution according to the invention also has the advantage that the expensive low-impedance measuring resistor can be dispensed with, which, in addition to the price disadvantage, also has a difficult delivery situation and can thus cause problems during production.

Die Regelung des Einschalt- und des Haltestromes verbessert in vorteilhafter Weise den Wirkungsgrad der Schützansteuerung. Weiterhin wird der Zeitgeber unabhängig von der Höhe des Einschaltstromes gestartet, was die Sicherheit der Schützansteuerung erhöht. Der herkömmliche Controller-Baustein L 5832 startet nämlich den Einschaltstromzeitgeber erst, nachdem der Einschaltstrom seinen vorgegebenen Wert erreicht hat. Würde dabei der vorgegebene Einschaltstrom nicht erreicht, dann würde der Baustein nicht auf Haltestrom umschalten und die Halbleiterbauteile würden thermisch durch den hohen Dauerstrom zerstört werden. Ein anderer Vorteil liegt in der Verwendung eines von der Eingangsspannung gesteuerten Schwellwertschalters im Eingang der Schützansteuerung, womit ein Flattern des Schützes infolge undefinierten Ein- und Ausschaltens vermieden wird.The regulation of the switch-on and the holding current advantageously improves the efficiency of the contactor control. Furthermore, the timer is started regardless of the level of the inrush current, which increases the safety of the contactor control. The conventional controller module L 5832 namely starts the inrush current timer only after the inrush current has reached its predetermined value. If the specified inrush current were not reached, the module would not switch to holding current and the semiconductor components would be thermally destroyed by the high continuous current. Another advantage lies in the use of a threshold switch controlled by the input voltage in the input of the contactor control, with which a flutter of the Contactor due to undefined switching on and off is avoided.

Anhand der Zeichnung wird ein Ausführungsbeispiel der Erfindung näher erläutert.An exemplary embodiment of the invention is explained in more detail with reference to the drawing.

Das Schaltbild zeigt eine elektronische Schützansteuerung mit einem Leistungs-FET für zwei Stromsollwerte mit Umschalter, Zeitsteuerung und Schwellwertschalter.The circuit diagram shows an electronic contactor control with a power FET for two current setpoints with changeover switch, time control and threshold switch.

Die Schützansteuerung wird an der Eingangsklemme 1 mit einer Versorgungsspannung beaufschlagt. Der Strom durch die Schützspule 2 wird mit der integrierten Leistungshalbleiterschaltung 3 zum Zwecke der Stromregelung getaktet. Damit das Schütz in den Abschaltphasen der Taktung nicht abfällt, ist ein für den Betrieb von Gleichstromschützen bekannter Freilaufkreis mit einer Diode 13 vorgesehen. Für die Stromregelung ist eine Messung des durch die Schützspule fließenden Stroms erforderlich. Dazu dient der Meßausgang 6 der integrierten Leistungshalbleiterschaltung 3. Als Schaltung 3 ist ein HEXSense-Baustein der Firma International Rectifier eingesetzt. In diesem Baustein sind etwa 1600 MOSFET's parallel geschaltet. Der Strom teilt sich dabei gleichmäßig auf die einzelnen MOSFET's auf. Der Source-Anschluß eines MOSFET's ist mit einem Extraanschluß, dem Meßausgang 6, nach außen geführt. An diesem Anschluß wird etwa ein Eintausendsechshundertstel des Gesamtstromes erfaßt. Das genaue Verhältnis der Anzahl der MOSFET's zum messenden MOSFET wird vom Hersteller mit einem dem jeweiligen Baustein zugeordneten Maßstabfaktor angegeben. Der Strom des Meßausganges 6 wird mit einem Operationsverstärker 8 in eine Spannung umgewandelt, die auf den negativen Eingang eines Komparators 10 gegeben wird. Auf den positiven Eingang dieses Komparators 10 ist das Ausgangssignal eines Referenzspannungsgebers 14 geschaltet. Wenn die Istwertspannung für den Schützstrom größer ist als die Referenzspannung, dann kippt der Ausgang des Komparators von einem positiven Spannungswert auf OV und startet damit den Ausschaltzeitgeber 12, der die Ausschaltphasen der Stromtaktung steuert.The contactor control is supplied with a supply voltage at input terminal 1. The current through the contactor coil 2 is clocked with the integrated power semiconductor circuit 3 for the purpose of current regulation. So that the contactor does not drop out in the switching-off phases of the clocking, a freewheeling circuit with a diode 13, which is known for the operation of direct current contactors, is provided. The current control requires a measurement of the current flowing through the contactor coil. The measurement output 6 of the integrated power semiconductor circuit 3 is used for this purpose. A HEXSense module from International Rectifier is used as circuit 3. Around 1600 MOSFETs are connected in parallel in this module. The current is divided evenly between the individual MOSFETs. The source connection of a MOSFET is led to the outside with an extra connection, the measuring output 6. About one thousand six hundredth of the total current is recorded at this connection. The exact ratio of the number of MOSFETs to the measuring MOSFET is specified by the manufacturer with a scale factor assigned to the respective module. The current of the measuring output 6 is converted with an operational amplifier 8 into a voltage which is applied to the negative input of a comparator 10. The output signal of a reference voltage transmitter 14 is connected to the positive input of this comparator 10. If the actual value voltage for the contactor current is greater than the reference voltage, the output of the comparator flips up from a positive voltage value OV and thus starts the switch-off timer 12, which controls the switch-off phases of the current clocking.

Zur Regelung sowohl des Einschalt- als auch des Haltestromes eines Schützes werden zwei unterschiedliche Referenzspannungen von dem Referenzspannungsgeber 14 bereitgestellt: Eine im Spannungswert höhere Referenzspannung für den kurzzeitigen Einschaltstrom und eine im Spannungswert niedrigere Referenzspannung für den Haltestrom des Schützes. Die Umschaltung der Referenzwerte erfolgt mit einem elektronischen Umschalter 15, der von einem elektronischen Zeitgeber 16 gesteuert wird und nacheinander die Referenzspannungen auf den Komparator 10 schaltet. Der Zeitgeber 16 startet sofort wenn die Versorgungsspannung anliegt mit der Einschaltstromphase. Das Anliegen der Versorgungsspannung wird mit einem elektronischen Schwellwertschalter 17 kontrolliert, der in den Eingang der Schützansteuerung angeordnet ist. Hat die Versorgungsspannung eine festgelegte Einschaltschwelle nicht überschritten, dann wird der Start des Zeitgebers 16 verhindert. Damit liegt an dem Komparator kein Referenzsignal an und die Drain-Source-Strecke der integrierten Halbleiterschaltung 3 ist gesperrt; es fließt kein Strom durch die Schützspule 2. Der Schwellwertschalter 17 kontrolliert ebenfalls den Ausschaltvorgang der Schützansteuerung. Sinkt die Versorgungsspannung unterhalb einer festgelegten Ausschaltschwelle, dann liegt am Komparator 10 keine Referenzspannung an und die Halbleiterschaltung 3 ist gesperrt. Mit dem Schwellwertschalter 17 wird somit ein definiertes Ein- und Ausschalten des Schützes erreicht und das Flattern des Schützes vermieden.To control both the inrush and the holding current of a contactor, two different reference voltages are provided by the reference voltage generator 14: a reference voltage which is higher in the voltage value for the brief inrush current and a lower reference voltage in the voltage value for the holding current of the contactor. The reference values are switched using an electronic switch 15, which is controlled by an electronic timer 16 and which successively switches the reference voltages to the comparator 10. The timer 16 starts immediately when the supply voltage is present with the inrush phase. The presence of the supply voltage is checked with an electronic threshold switch 17, which is arranged in the input of the contactor control. If the supply voltage has not exceeded a defined switch-on threshold, then the start of the timer 16 is prevented. This means that there is no reference signal at the comparator and the drain-source path of the integrated semiconductor circuit 3 is blocked; no current flows through the contactor coil 2. The threshold switch 17 also controls the switching off of the contactor control. If the supply voltage drops below a specified switch-off threshold, then there is no reference voltage at the comparator 10 and the semiconductor circuit 3 is blocked. With the threshold switch 17, a defined switching on and off of the contactor is achieved and the fluttering of the contactor is avoided.

Claims (1)

  1. Electronic protective control for regulation of direct current supply in the case of fluctuating supply voltage, by means of a current keying and a freewheel circuit for maintaining protection in the current cut-off phases,
    a) with a setting member of the regulating circuit, which is constructed as an integrated power semiconductor circuit (3), which contains a plurality of field effect transistors, of which at least one serves as a measurement output (6) for detection of the load current flowing through the other parallel branch; wherein
    b) the current signal of the measurement output (6) acts on an operational amplifier (8), which is constructed as a current and voltage transformer, for the purpose of conversion into a voltage signal (9), which is applied as actual value to the input of the regulating member (10, 12, 14) for the current keying;
    characterised by the following features:
    c) a reference voltage transmitter (14) for two different reference signals with different voltage values for regulation of the switch-on and holding current;
    d) a time-signal transmitter (16) for changing over of the reference voltage signals, which starts the time rundown on switching on to the supply voltage with the switch-on current phase and superimooses the reference signals in time sequence on the opposite comparator (1) of the current keying;
    e) a threshold value switch (17), which is controlled by the input voltage and which switches on the protective control only when the supply voltage exceeds a predetermined switch-on threshold and switches off the protective control when the supply voltage falls below a predetermined switch-off threshold.
EP90104583A 1989-03-14 1990-03-10 Electronic control for contactor Expired - Lifetime EP0387729B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3908192 1989-03-14
DE3908192A DE3908192A1 (en) 1989-03-14 1989-03-14 ELECTRONIC CONTACTOR CONTROL

Publications (3)

Publication Number Publication Date
EP0387729A2 EP0387729A2 (en) 1990-09-19
EP0387729A3 EP0387729A3 (en) 1990-11-22
EP0387729B1 true EP0387729B1 (en) 1995-05-03

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EP90104583A Expired - Lifetime EP0387729B1 (en) 1989-03-14 1990-03-10 Electronic control for contactor

Country Status (6)

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US (1) US5113307A (en)
EP (1) EP0387729B1 (en)
JP (1) JP3057571B2 (en)
DE (2) DE3908192A1 (en)
DK (1) DK0387729T3 (en)
ES (1) ES2073467T3 (en)

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Also Published As

Publication number Publication date
DE3908192C2 (en) 1991-11-28
JP3057571B2 (en) 2000-06-26
ES2073467T3 (en) 1995-08-16
EP0387729A2 (en) 1990-09-19
JPH02281527A (en) 1990-11-19
DE3908192A1 (en) 1990-09-20
US5113307A (en) 1992-05-12
EP0387729A3 (en) 1990-11-22
DE59008993D1 (en) 1995-06-08
DK0387729T3 (en) 1995-09-18

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