DE19617110A1 - Circuit arrangement for operating an electromagnet - Google Patents

Circuit arrangement for operating an electromagnet

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Publication number
DE19617110A1
DE19617110A1 DE19617110A DE19617110A DE19617110A1 DE 19617110 A1 DE19617110 A1 DE 19617110A1 DE 19617110 A DE19617110 A DE 19617110A DE 19617110 A DE19617110 A DE 19617110A DE 19617110 A1 DE19617110 A1 DE 19617110A1
Authority
DE
Germany
Prior art keywords
capacitor
electromagnet
power supply
circuit arrangement
semiconductor switch
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Withdrawn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
DE19617110A
Other languages
German (de)
Inventor
Wolfgang Dipl Ing Roehl
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 DE19617110A priority Critical patent/DE19617110A1/en
Priority to PCT/DE1997/000815 priority patent/WO1997040508A1/en
Publication of DE19617110A1 publication Critical patent/DE19617110A1/en
Withdrawn legal-status Critical Current

Links

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
    • H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
    • H01H47/04—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current
    • H01H47/043—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current making use of an energy accumulator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/1555—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only for the generation of a regulated current to a load whose impedance is substantially inductive

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Direct Current Feeding And Distribution (AREA)
  • Stand-By Power Supply Arrangements (AREA)

Abstract

A circuit arrangement for operating an electromagnet (14) from a direct voltage source (1, 2) contains a power supply device (5) operating in the manner of a switched-mode power supply and a capacitor (12) rated as an energy store. A controlled semiconductor switch (15) is situated in the electric circuit of the electromagnet (14) and can be controlled with or without delay by a logic component (16) as a function of the voltage at the input and at the capacitor serving as energy store.

Description

Die Erfindung betrifft eine Schaltungsanordnung zum Betrieb eines Elektromagneten aus einer Gleichspannungsquelle mit einem Kondensator und mit einem Halbleiterschalter.The invention relates to a circuit arrangement for operation with an electromagnet from a DC voltage source a capacitor and with a semiconductor switch.

Eine bekannte Schaltungsanordnung der genannten Art (US 4 786 885 A) enthält als Halbleiterschalter einen Schwellwertschalter, der nach dem Erreichen einer bestimmten Spannung des Kondensators den Stromkreis des Elektromagneten schließt. Durch die Erfindung soll demgegenüber eine Schaltungsanordnung mit der Eigenschaft geschaffen werden, daß eine zur Betätigung des Elektromagneten erforderliche Energie auch bei Ausfall eines speisenden Netzes möglichst lange bereitgehalten wird.A known circuit arrangement of the type mentioned (US 4,786,885 A) contains a semiconductor switch Threshold switch, which after reaching a certain Voltage of the capacitor the circuit of the electromagnet closes. In contrast, the invention is intended to provide a Circuit arrangement with the property to be created that one required to actuate the electromagnet Energy if possible even in the event of a supply network failure is kept ready for a long time.

Gemäß der Erfindung wird diese Aufgabe dadurch gelöst, daß die Gleichspannungsquelle nach Art eines Schaltnetzteiles aufgebaut ist und daß durch die Gleichspannungsquelle über eine zur Entkopplung dienende Diode ein als Energiespeicher bemessener Kondensator aufladbar ist, der durch den steuerbar ausgebildeten Halbleiterschalter mit dem Elektromagneten verbindbar ist.According to the invention, this object is achieved in that the DC voltage source in the manner of a switching power supply is built up and that through the DC voltage source a decoupling diode serves as an energy store dimensioned capacitor is chargeable, which is controllable by the trained semiconductor switch with the electromagnet is connectable.

Schaltnetzteile haben die Eigenschaft, daß sie eine in erheblichen Grenzen schwankende Eingangsspannung in eine gleichbleibende Ausgangsspannung umwandeln können, wobei sich das Niveau der Eingangsspannung und der Ausgangsspannung voneinander erheblich unterscheiden kann. Bei der Schaltungsanordnung nach der Erfindung ermöglicht es die vorgesehene Art der Gleichspannungsquelle, den als Energiespeicher bemessenen Kondensator auf eine verhältnismäßig hohe Spannung aufzuladen, was bei gegebener Baugröße des Kondensators einen vorteilhaft großen Energievorrat ergibt. Auf diese Weise ist es möglich, den Elektromagneten auch längere Zeit nach Ausfall der Eingangsspannung der Schaltungsanordnung den Elektromagneten zu betätigen. Die kann beispielsweise erwünscht sein, wenn der Elektromagnet als Auslösemagnet eines verklinkten Schützes ausgebildet ist. In diesem Fall ist es erwünscht, daß sich das Schütz bei Ausfall des Netzes ferngesteuert abschalten läßt.Switching power supplies have the property that they are one in considerable fluctuations in input voltage in a can convert constant output voltage, whereby the level of the input voltage and the output voltage  can differ significantly from each other. In the Circuit arrangement according to the invention makes it possible intended type of DC voltage source, the as Energy storage rated capacitor on a relatively high voltage to charge what is given Size of the capacitor an advantageously large Energy reserve results. In this way it is possible to Electromagnets also for a long time after failure of the Input voltage of the circuit arrangement the electromagnet to operate. For example, this may be desirable if the electromagnet as a release magnet of a latched Contactor is trained. In this case it is desirable that the contactor is remotely controlled if the network fails can be switched off.

Im Rahmen der Erfindung kann dem Halbleiterschalter ein Steuersignal nach Bewertung durch einen Logikschaltkreis zuführbar sein, der die am Eingang der Stromversorgungsschaltung und an dem Kondensator anliegenden Spannungen prüft. Je nach dem Ergebnis der Bewertung kann das Steuersignal verzögert oder unverzögert freigegeben werden.In the context of the invention, the semiconductor switch Control signal after evaluation by a logic circuit be feedable to those at the entrance of the Power supply circuit and applied to the capacitor Checks voltages. Depending on the result of the evaluation, this can Control signal are released with a delay or without delay.

Insbesondere kann dafür gesorgt sein, daß der Logikschalt­ kreis bei fehlender Eingangsspannung ein Steuersignal für den Elektromagneten unverzögert freigibt. Auf diese Weise wird sich in den meisten Fällen der Elektromagnet betätigen lassen, da der Kondensator eine hierzu ausreichende Energie über einen beträchtlichen Zeitraum zu speichern vermag. In particular, it can be ensured that the logic circuit If there is no input voltage, a control signal for the Releases electromagnets without delay. That way in most cases the electromagnet operates because the capacitor has sufficient energy for this can store for a considerable period of time.  

Es kann jedoch auch der Betriebszustand auftreten, daß zwar eine Eingangsspannung vorhanden ist, jedoch die in dem Kondensator gespeicherte Energiemenge für eine sichere Betätigung des Elektromagneten nicht ausreicht. In diesem Fall sorgt die Logikschaltung dafür, daß ein Steuersignal für den Elektromagneten zwecks ausreichender Nachladung des Kondensators erst bei Erreichen eines Schwellwertes freigegeben wird.However, the operating state can also occur that there is an input voltage, but that in the Capacitor stored amount of energy for a safe Activation of the electromagnet is not sufficient. In this In this case, the logic circuit ensures that a control signal for the electromagnet for a sufficient recharge of the Capacitor only when a threshold value is reached is released.

Die Erfindung wird im folgenden anhand des in der Figur gezeigten Prinzipschaltbildes näher erläutert.The invention is based on the in the figure block diagram shown explained in more detail.

Mit Anschlußpunkten 1 und 2, die zu einem Versorgungsnetz gehören, ist eine Gleichrichterbrückenschaltung 3 verbunden, deren durch einen Kondensator 4 geglättete Ausgangsspannung eine nach Art eines Schaltnetzteiles wirkende Stromver­ sorgungseinrichtung 5 speist. In bekannter Weise enthält die Stromversorgungseinrichtung 5 als wesentliche Bestandteile einen Taktgeber 6 sowie einen Leistungstransistor 7, mit vorgeschalteter Drossel 8 ferner eine Diode 10 und einen Kondensator 11 mit einer verhältnismäßig geringen Kapazität. An einem mit 12 bezeichneten Anschlußpunkt der Stromversorgungseinrichtung 5 liegt ein Kondensator 13 mit einer verhältnismäßig großen Kapazität, der über eine weitere Diode 14 aufladbar ist.With connection points 1 and 2 , which belong to a supply network, a rectifier bridge circuit 3 is connected, whose output voltage smoothed by a capacitor 4 feeds a power supply device 5 acting in the manner of a switching power supply. In a known manner, the power supply device 5 contains as essential components a clock generator 6 and a power transistor 7 , with an upstream choke 8, a diode 10 and a capacitor 11 with a relatively low capacitance. At a connection point designated by 12 of the power supply device 5 is a capacitor 13 with a relatively large capacity, which can be charged via a further diode 14 .

Ein Elektromagnet 15, bei dem es sich beispielsweise um den Entklinkungsmagneten eines verklinkbaren elektromagnetischen Schützes handeln kann (vgl. DE 35 24 524 C1), ist über einen als Transistor ausgebildeten steuerbaren Halbleiterschalter 16 mit dem Kondensator 13 verbindbar, der als Energiespeicher dient. Ein Logikschaltkreis 17 stellt das Steuersignal für den Halbleiterschalter 16 nach Anforderung durch einen Steuerschalter 18 bereit. Hierzu wird dem Logikschaltkreis 17 über eine Leitung 20 die am Eingang der Stromver­ sorgungseinrichtung 5 liegende Eingangsspannung zugeführt. Der Logikbaustein 17 besitzt 2 Komparatoreingänge. Aufgrund entsprechend gewählter Verknüpfungen gibt der Logikschalt­ kreis 17 einen mittels des Steuerschalters 18 gegebenen Steuerbefehl an den Halbleiterschalter 16 unverzögert frei, wenn die Eingangsspannung der Stromversorgungseinrichtung 5 fehlt oder sehr niedrig ist. Hiermit wird in jedem Fall, also auch bei zu niedriger Auslösespannung am Kondensator 13, ein Auslöseversuch des Elektromagneten 15 unternommen.An electromagnet 15 , which can be, for example, the unlatching magnet of a latchable electromagnetic contactor (cf. DE 35 24 524 C1), can be connected to the capacitor 13 via a controllable semiconductor switch 16 , which serves as an energy store. A logic circuit 17 provides the control signal for the semiconductor switch 16 upon request by a control switch 18 . To this end, the logic circuit 17 is fed via a line 20 to the input voltage at the input of the current supply device 5 . The logic module 17 has 2 comparator inputs. On the basis of correspondingly selected combinations, the logic circuit 17 releases a control command given by the control switch 18 to the semiconductor switch 16 without delay if the input voltage of the power supply device 5 is missing or is very low. In this case, in any case, even if the trigger voltage at the capacitor 13 is too low, the electromagnet 15 is attempted to trigger.

Für den Fall, daß an der Stromversorgungseinrichtung 5 eine Eingangsspannung anliegt, erfolgt die Auslösung nur, wenn die Ladespannung am Kondensator 13 einen für eine sichere Aus­ lösung erforderlichen Schwellwert überschritten hat. Diese Maßnahme ist wichtig, wenn z. B. der Schalter 18 geschlossen ist und die Netzspannung erst später angelegt wird. Da das Netzteil nicht in der Lage ist, den hohen Anzugsstrom des Elektromagneten 15 zu liefern, erfolgt dann erst eine Auf­ ladung des Kondensators 13. Wird nach kurzer Zeit der erforderliche Schwellwert erreicht, so erfolgt über den Logikschaltkreis eine Auslösung.In the event that an input voltage is present at the power supply device 5 , the triggering takes place only when the charging voltage at the capacitor 13 has exceeded a threshold value required for a safe solution. This measure is important if e.g. B. the switch 18 is closed and the mains voltage is applied later. Since the power supply unit is unable to deliver the high starting current of the electromagnet 15 , the capacitor 13 is only charged. If the required threshold value is reached after a short time, the logic circuit triggers.

Um die Schaltung und den Auslösemagneten 15 vor Überlastung zu schützen, wird das Auslösesignal durch den Logikschalt­ kreis 17 auf eine maximale Zeit von z. B. 100 ms begrenzt. In order to protect the circuit and the trigger magnet 15 from overload, the trigger signal by the logic circuit 17 for a maximum time of z. B. 100 ms limited.

Die beschriebene Schaltungsanordnung ist geeignet, die benötigte Auslöseenergie bei vergleichsweise geringen Ab­ messungen des kompletten Gerätes für wenigstens 30 min und bis über 10 h zu speichern. Die erreichbaren Zeiträume sind dabei noch durch die Güte des als Energiespeicher dienenden Kondensators 13 (bzw. mehrerer parallel geschalteter solcher Kondensatoren) und der Diode 14 zu beeinflussen. Als Güte­ merkmal sind her insbesondere die Leckströme der genannten Bauteile von Bedeutung.The circuit arrangement described is suitable for storing the required trigger energy with comparatively small dimensions from the complete device for at least 30 minutes and up to over 10 hours. The attainable periods of time can also be influenced by the quality of the capacitor 13 serving as an energy store (or a plurality of such capacitors connected in parallel) and the diode 14 . The leakage currents of the components mentioned are particularly important as a quality feature.

Claims (4)

1. Schaltungsanordnung zum Betrieb eines Elektromagneten (15) aus einer Gleichspannungsquelle (1, 2) mit einem Kondensator (4) und mit einem Halbleiterschalter (16), dadurch gekennzeichnet, daß der Gleichspannungsquelle (1, 2) eine nach der Art eines Schaltnetzteiles wirkende Stromversorgungseinrichtung (5) nachgeschaltet ist und daß durch die Stromversorgungs­ einrichtung (5) über eine zur Entkopplung dienende Diode (14) ein als Energiespeicher bemessener Kondensator (13) aufladbar ist, der durch den steuerbar ausgebildeten Halbleiterschalter (16) mit dem Elektromagneten (15) verbindbar ist.1. Circuit arrangement for operating an electromagnet ( 15 ) from a DC voltage source ( 1 , 2 ) with a capacitor ( 4 ) and with a semiconductor switch ( 16 ), characterized in that the DC voltage source ( 1 , 2 ) acting in the manner of a switching power supply Power supply device ( 5 ) is connected downstream and that the power supply device ( 5 ) via a decoupling diode ( 14 ) can be used to charge a capacitor ( 13 ) dimensioned as an energy store, which is controlled by the controllable semiconductor switch ( 16 ) with the electromagnet ( 15 ). is connectable. 2. Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, daß dem Halbleiterschalter (16) ein Steuersignal nach Bewertung durch einen Logikschaltkreis (17) zuführbar ist, der die am Eingang der Stromversorgungseinrichtung (5) und an dem als Energiespeicher dienenden Kondensator (13) anliegenden Spannungen prüft.2. Circuit arrangement according to claim 1, characterized in that the semiconductor switch ( 16 ), a control signal after evaluation by a logic circuit ( 17 ) can be supplied, the voltages present at the input of the power supply device ( 5 ) and at the capacitor ( 13 ) serving as an energy store checks. 3. Schaltungsanordnung nach Anspruch 2, dadurch gekennzeichnet, daß der Logikschaltkreis (17) bei fehlender Eingangsspannung ein Steuersignal für den Elektromagneten (15) unverzögert freigibt.3. Circuit arrangement according to claim 2, characterized in that the logic circuit ( 17 ) releases a control signal for the electromagnet ( 15 ) without delay when there is no input voltage. 4. Schaltungsanordnung nach Anspruch 2 dadurch gekennzeichnet, daß die Logikschaltung (17) bei vorhandener Eingangsspannung der Gleichspannungsquelle, jedoch ungenügender Ladespannung des Kondensators (13) ein Steuersignal für den Elektromagneten (15) zwecks ausreichender Nachladung des Kondensators (15) erst nach Erreichen eines Schwellwertes freigibt.4. Circuit arrangement according to claim 2, characterized in that the logic circuit ( 17 ) with an existing input voltage of the DC voltage source, but insufficient charging voltage of the capacitor ( 13 ), a control signal for the electromagnet ( 15 ) for sufficient recharging of the capacitor ( 15 ) only after reaching a threshold value releases.
DE19617110A 1996-04-19 1996-04-19 Circuit arrangement for operating an electromagnet Withdrawn DE19617110A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19617110A DE19617110A1 (en) 1996-04-19 1996-04-19 Circuit arrangement for operating an electromagnet
PCT/DE1997/000815 WO1997040508A1 (en) 1996-04-19 1997-04-18 Circuit arrangement for operating an electromagnet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19617110A DE19617110A1 (en) 1996-04-19 1996-04-19 Circuit arrangement for operating an electromagnet

Publications (1)

Publication Number Publication Date
DE19617110A1 true DE19617110A1 (en) 1997-10-23

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ID=7792792

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19617110A Withdrawn DE19617110A1 (en) 1996-04-19 1996-04-19 Circuit arrangement for operating an electromagnet

Country Status (2)

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DE (1) DE19617110A1 (en)
WO (1) WO1997040508A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0994499A1 (en) * 1998-10-15 2000-04-19 Schneider Electric Industries SA Electronic power supply device for an electromagnetic switch device
WO2001013396A1 (en) * 1999-08-12 2001-02-22 Siemens Aktiengesellschaft Circuitry for an electromagnetic switchgear
DE10001530A1 (en) * 2000-01-15 2001-07-19 Mannesmann Rexroth Ag Electrical circuit arrangement for converting an electrical input variable into an impressed electrical output voltage
DE10332250A1 (en) * 2003-07-16 2005-02-03 Erben Kammerer Kg Tripping circuit for an electromagnetic actuator
DE102008018260A1 (en) * 2008-03-31 2009-10-08 Siemens Aktiengesellschaft Controller for electromechanical drive of electrical switchgear i.e. contactor, has current sensor connected with output, and energy storage i.e. capacitor, supplying current to electromechanical drive after omission of control voltage
DE102008018255A1 (en) * 2008-03-31 2009-10-08 Siemens Aktiengesellschaft Electrical switching device for controlling of e.g. motor, has supply voltage line attached to converter, which is provided for charging of buffer capacitor during operation, where capacitor is connected downstream of control circuit

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
US10832846B2 (en) 2018-08-14 2020-11-10 Automatic Switch Company Low power solenoid with dropout detection and auto re-energization

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US5008773A (en) * 1987-11-20 1991-04-16 Toto, Ltd. Solenoid valve control circuit
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Publication number Priority date Publication date Assignee Title
GB2090092A (en) * 1980-12-09 1982-06-30 Lucas Industries Ltd Drive circuit for eletromagnetic load
DE3206590A1 (en) * 1982-01-26 1983-08-04 Eugen Seitz AG, 8623 Wetzikon Step-function current generator
US5008773A (en) * 1987-11-20 1991-04-16 Toto, Ltd. Solenoid valve control circuit
DE4202805A1 (en) * 1992-01-31 1993-08-05 Robert Seuffer Gmbh & Co Generator for supplying DC to excitation coil of magnet e.g. of solenoid valve - supplies pulsed current at frequency such that armature stays in end position when coil is switched off between pulses due to remanence
DE4214897C1 (en) * 1992-05-07 1993-08-19 Schleicher Gmbh & Co Relais-Werke Kg, 1000 Berlin, De Circuit for protection of electronics against transient voltage surges - has detector stage that identifies increase and switches supply to internal arrangement having capacitor and constant current supply
DE4237706A1 (en) * 1992-11-07 1994-05-11 Mtu Friedrichshafen Gmbh Circuit to determine response end point of solenoid armature of valve - has pulsed excitation of coil with change in mark to space ratio used to identify response end point
US5471360A (en) * 1992-12-15 1995-11-28 Fuji Electric Co., Ltd. DC electromagnet apparatus
DE4325578A1 (en) * 1993-07-30 1995-02-02 Hartmann & Laemmle Elektronisc Switching device for an electromagnet

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0994499A1 (en) * 1998-10-15 2000-04-19 Schneider Electric Industries SA Electronic power supply device for an electromagnetic switch device
FR2784791A1 (en) * 1998-10-15 2000-04-21 Schneider Electric Sa ELECTRONIC SUPPLY DEVICE FOR ELECTROMAGNETIC SWITCHING APPARATUS
WO2001013396A1 (en) * 1999-08-12 2001-02-22 Siemens Aktiengesellschaft Circuitry for an electromagnetic switchgear
DE10001530A1 (en) * 2000-01-15 2001-07-19 Mannesmann Rexroth Ag Electrical circuit arrangement for converting an electrical input variable into an impressed electrical output voltage
DE10332250A1 (en) * 2003-07-16 2005-02-03 Erben Kammerer Kg Tripping circuit for an electromagnetic actuator
DE102008018260A1 (en) * 2008-03-31 2009-10-08 Siemens Aktiengesellschaft Controller for electromechanical drive of electrical switchgear i.e. contactor, has current sensor connected with output, and energy storage i.e. capacitor, supplying current to electromechanical drive after omission of control voltage
DE102008018255A1 (en) * 2008-03-31 2009-10-08 Siemens Aktiengesellschaft Electrical switching device for controlling of e.g. motor, has supply voltage line attached to converter, which is provided for charging of buffer capacitor during operation, where capacitor is connected downstream of control circuit

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Publication number Publication date
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