WO2001001538A1 - Protective circuit - Google Patents

Protective circuit Download PDF

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Publication number
WO2001001538A1
WO2001001538A1 PCT/DE2000/001940 DE0001940W WO0101538A1 WO 2001001538 A1 WO2001001538 A1 WO 2001001538A1 DE 0001940 W DE0001940 W DE 0001940W WO 0101538 A1 WO0101538 A1 WO 0101538A1
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WO
WIPO (PCT)
Prior art keywords
contactor
current
switching element
current sensor
circuit
Prior art date
Application number
PCT/DE2000/001940
Other languages
German (de)
French (fr)
Inventor
Bernhard Streich
Gerd Griepentrog
Diethard Runggaldier
Original Assignee
Siemens Aktiengesellschaft
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 Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2001001538A1 publication Critical patent/WO2001001538A1/en

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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
    • H02H9/047—Free-wheeling circuits

Definitions

  • the present invention relates to a contactor circuit with a contactor coil, a current sensor, a switching element, a free-wheeling diode and an Ans euerScnies, wherein at least one load contact can be actuated with the contactor coil, wherein the current sensor and the switching element are connected in series with the contactor coil, wherein the free-wheeling diode overlaps the contactor coil, the control circuit being able to be given a control command on the basis of which the switching element can be actuated, the control circuit being connected to the current sensor, so that a contactor current flowing through the contactor coil can be regulated.
  • Contactor circuits of this type are generally known. They are used in particular when the supply voltage of the contactor circuit may fluctuate within certain limits.
  • the contactor current flows through the current sensor only when the switching element is actuated. This leads to considerable restrictions in the possible uses and the reliability of the contactor circuit.
  • the object of the present invention is to provide a contactor circuit in which the contactor current is always measurable and thus better control of the contactor current is possible.
  • the object is achieved in that the freewheeling diode also overlaps the current sensor.
  • the invention is therefore based on the knowledge that with a suitable arrangement of the current sensor, the contactor current can also be opened state of the switching element flows through the current sensor.
  • the current sensor can be designed differently. In the simplest case, it is designed as a resistor.
  • the detection and further processing of the contactor current is particularly simple if the contactor coil is arranged between the current sensor and the switching element. This is especially true when the control circuit and the current sensor are connected to a common supply connection for the contactor circuit.
  • the control of the contactor current is particularly simple when the switching element is opened when the contactor current reaches a maximum current and is closed when the contactor current reaches a minimum current. So-called two-point control is carried out.
  • the two-point control is particularly flexible if the minimum and / or the maximum current can be preselected.
  • the control circuit is particularly flexible if it is designed as a microprocessor.
  • a contactor circuit has a contactor coil 1, a current sensor 2, a switching element 3, a free-wheeling diode 4 and a control circuit 5. At least one load contact 6 can be actuated by means of the contactor coil 1. According to FIG 1, even three load contacts 6 can be actuated.
  • the current sensor 2, the switching element 3 and the contactor coil 1 are connected in series, the contactor coil 1 being arranged between the current sensor 2 and the switching element 3.
  • the freewheeling diode 4 overlaps the contactor coil 1 and the current sensor 2.
  • the current sensor 2 is designed as a resistor 1, the switching element 3 as a MOSFET 3.
  • the control circuit 5 is designed as a microprocessor 5. It is supplied with power via a 5 l power supply device. It can be given a control command on the basis of which the switching element 3 can be actuated.
  • the switching element 3 is actuated via a coupling element 7, by means of which the control circuit 5 is electrically isolated from the switching element 3.
  • the coupling element 7 can, for. B. be an optocoupler 7.
  • the switching element 3 is open. No contactor current I flows through the contactor coil 1. If, however, a control command is given to the control circuit 5, a contactor current I flows through the contactor coil 1.
  • the control circuit 5 is connected to the current sensor 2.
  • the contactor current I can thus be detected and regulated.
  • the control takes place in such a way that the switching element 3 is initially closed. This causes the contactor current I to rise.
  • the contactor current I reaches a maximum current I max , the switching element 3 is opened.
  • the contactor current I is thus reduced via the freewheeling diode 4.
  • the contactor current I reaches a minimum current I min , the switching element 3 is closed again. The opening and closing of the switching element 3 will repeated repeatedly until the control circuit 5 is no longer given a control command. There is therefore a two-point control of the contactor current I.
  • the minimum current I m i n and the maximum current I max can be predefined in a simple manner, the drive circuit 5 as a parameter. So you can select them.
  • control circuit 5 and the current sensor 2 are connected to a common supply connection 8 for the contactor circuit. This enables direct detection of the contactor current I without a potential shift between the control circuit 5 and the current sensor 2.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Relay Circuits (AREA)

Abstract

The invention relates to a protective circuit with a current sensor (2) and a switch element (3) that is connected in series with a safety coil (1). Said safety coil (1) and said current sensor (2) are encircled by a recovery diode (4). At least one load contact (6) is actuated by said safety coil (1). A control command is allocated to a control circuit (5) and said control command is used to actuate the switch element (3). The control circuit (5) is connected to the current sensor (2) so that a protective current (I) running through the safety coil (1) can be regulated.

Description

Beschreibungdescription
Schützschaltungcontactor circuit
Die vorliegende Erfindung betrifft eine Schützschaltung mit einer Schützspule, einem Stromfühler, einem Schaltelement, einer Freilaufdiode und einer Ans euerSchaltung, wobei mit der Schützspule mindestens ein Lastkontakt betätigbar ist, wobei der Stromfühler und das Schaltelement mit der Schütz- spule in Reihe geschaltet sind, wobei die Freilaufdiode die Schützspule übergreift, wobei der Ansteuerschaltung ein An- steuerbefehl vorgebbar ist, aufgrund dessen das Schaltelement betätigbar ist, wobei die Ansteuerschaltung mit dem Stromfühler verbunden ist, so daß ein durch die Schützspule fließen- der Schützstrom regelbar ist.The present invention relates to a contactor circuit with a contactor coil, a current sensor, a switching element, a free-wheeling diode and an Ans euerSchaltung, wherein at least one load contact can be actuated with the contactor coil, wherein the current sensor and the switching element are connected in series with the contactor coil, wherein the free-wheeling diode overlaps the contactor coil, the control circuit being able to be given a control command on the basis of which the switching element can be actuated, the control circuit being connected to the current sensor, so that a contactor current flowing through the contactor coil can be regulated.
Derartige Schützschaltungen sind allgemein bekannt. Sie werden insbesondere dann eingesetzt, wenn die Versorgungsspannung der Schützschaltung innerhalb gewisser Grenzen schwanken darf.Contactor circuits of this type are generally known. They are used in particular when the supply voltage of the contactor circuit may fluctuate within certain limits.
Bei der Schützschaltung des Standes der Technik fließt der Schützstrom nur bei betätigtem Schaltelement durch den Stromfühler. Dies führt zu erheblichen Einschränkungen bei den Einsatzmöglichkeiten und der Zuverlässigkeit der Schützschaltung.In the contactor circuit of the prior art, the contactor current flows through the current sensor only when the switching element is actuated. This leads to considerable restrictions in the possible uses and the reliability of the contactor circuit.
Die Aufgabe der vorliegenden Erfindung besteht darin, eine Schützschaltung zu schaffen, bei der der Schützstrom stets meßbar und so eine bessere Regelung des Schützstromes möglich ist.The object of the present invention is to provide a contactor circuit in which the contactor current is always measurable and thus better control of the contactor current is possible.
Die Aufgabe wird dadurch gelöst, daß die Freilaufdiode auch den Stromfühler übergreift.The object is achieved in that the freewheeling diode also overlaps the current sensor.
Die Erfindung beruht somit auf der Erkenntnis, daß bei geeigneter Anordnung des Stromfühlers der Schützstrom auch im ge- öffneten Zustand des Schaltelements durch den Stromfühler fließt.The invention is therefore based on the knowledge that with a suitable arrangement of the current sensor, the contactor current can also be opened state of the switching element flows through the current sensor.
Der Stromfühler kann verschieden ausgebildet sein. Im ein- fachsten Fall ist er als Widerstand ausgebildet.The current sensor can be designed differently. In the simplest case, it is designed as a resistor.
Die Erfassung und Weiterverarbeitung des Schützstromes ist besonders einfach, wenn die Schützspule zwischen dem Stromfühler und dem Schaltelement angeordnet ist. Dies gilt ganz besonders dann, wenn die AnsteuerSchaltung und der Stromfühler mit einem gemeinsamen Versorgungsanschluß für die Schützschaltung verbunden sind.The detection and further processing of the contactor current is particularly simple if the contactor coil is arranged between the current sensor and the switching element. This is especially true when the control circuit and the current sensor are connected to a common supply connection for the contactor circuit.
Trotz des Potentialunterschiedes zwischen der Ansteuerschal- tung und dem Schaltelement ist auf einfache Weise eine problemlose Ansteuerung des Schaltelements möglich, wenn die Ansteuerschaltung vom Schaltelement potentialgetrennt ist.Despite the potential difference between the control circuit and the switching element, problem-free control of the switching element is possible in a simple manner if the control circuit is electrically isolated from the switching element.
Die Regelung des Schützstromes ist besonders einfach, wenn das Schaltelement geöffnet wird, wenn der Schützstrom einen Maximalstrom erreicht, und geschlossen wird, wenn der Schützstrom einen Minimalstrom erreicht. Es wird also eine sogenannte Zweipunktregelung durchgeführt.The control of the contactor current is particularly simple when the switching element is opened when the contactor current reaches a maximum current and is closed when the contactor current reaches a minimum current. So-called two-point control is carried out.
Die Zweipunktregelung ist besonders flexibel, wenn der Minimal- und/oder der Maximalstrom vorwählbar sind.The two-point control is particularly flexible if the minimum and / or the maximum current can be preselected.
Die Ansteuerschaltung ist besonders flexibel, wenn sie als Mikroprozessor ausgebildet ist.The control circuit is particularly flexible if it is designed as a microprocessor.
Weitere Vorteile und Einzelheiten ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels . Dabei zeigt in Prinzipdarstellung die einzigeFurther advantages and details emerge from the following description of an exemplary embodiment. The principle illustration shows the only one
FIG 1 eine Schützschaltung. Gemäß FIG 1 weist eine Schützschaltung eine Schützspule 1, einen Stromfühler 2, ein Schaltelement 3, eine Freilaufdiode 4 und eine Ansteuerschaltung 5 auf. Mittels der Schützspule 1 ist mindestens ein Lastkontakt 6 betätigbar. Gemäß FIG 1 sind sogar drei Lastkontakte 6 betätigbar.1 shows a contactor circuit. According to FIG. 1, a contactor circuit has a contactor coil 1, a current sensor 2, a switching element 3, a free-wheeling diode 4 and a control circuit 5. At least one load contact 6 can be actuated by means of the contactor coil 1. According to FIG 1, even three load contacts 6 can be actuated.
Der Stromfühler 2, das Schaltelement 3 und die Schützspule 1 sind in Reihe geschaltet, wobei die Schützspule 1 zwischen dem Stromfühler 2 und dem Schaltelement 3 angeordnet ist. Die Freilaufdiode 4 übergreift die Schützspule 1 und den Stromfühler 2. Der Stromfühler 2 ist als Widerstand 1 ausgebildet, das Schaltelement 3 als MOSFET 3.The current sensor 2, the switching element 3 and the contactor coil 1 are connected in series, the contactor coil 1 being arranged between the current sensor 2 and the switching element 3. The freewheeling diode 4 overlaps the contactor coil 1 and the current sensor 2. The current sensor 2 is designed as a resistor 1, the switching element 3 as a MOSFET 3.
Die Ansteuerschaltung 5 ist als Mikroprozessor 5 ausgebildet. Sie wird über eine Stromversorgungseinrichtung 5 l mit Strom versorgt. Ihr ist ein Ansteuerbefehl vorgebbar, aufgrund dessen das Schaltelement 3 betätigbar ist. Das Betätigen des Schaltelements 3 erfolgt dabei über ein Koppelelement 7, mittels dessen die Ansteuerschaltung 5 vom Schaltelement 3 po- tentialgetrennt ist. Das Koppelelement 7 kann z. B. ein Optokoppler 7 sein.The control circuit 5 is designed as a microprocessor 5. It is supplied with power via a 5 l power supply device. It can be given a control command on the basis of which the switching element 3 can be actuated. The switching element 3 is actuated via a coupling element 7, by means of which the control circuit 5 is electrically isolated from the switching element 3. The coupling element 7 can, for. B. be an optocoupler 7.
Wenn der Ansteuerschaltung 5 kein AnSteuerbefehl vorgegeben ist, ist das Schaltelement 3 geöffnet. Es fließt kein Schütz- ström I durch die Schützspule 1. Wenn der Ansteuerschaltung 5 hingegen ein Ansteuerbefehl vorgegeben ist, fließt ein Schützstrom I durch die Schützspule 1.If the control circuit 5 is not given a control command, the switching element 3 is open. No contactor current I flows through the contactor coil 1. If, however, a control command is given to the control circuit 5, a contactor current I flows through the contactor coil 1.
Die Ansteuerschaltung 5 ist mit dem Stromfühler 2 verbunden. Dadurch ist der Schützstrom I erfaßbar und regelbar. Die Regelung erfolgt derart, daß das Schaltelement 3 zunächst geschlossen wird. Dadurch steigt der Schützstrom I an. Wenn der Schützstrom I einen Maximalstrom Imax erreicht, wird das Schaltelement 3 geöffnet. Der Schützstrom I baut sich somit über die Freilaufdiode 4 ab. Wenn der Schützstrom I einen Minimalstrom Imin erreicht, wird das Schaltelement 3 wieder geschlossen. Das Öffnen und Schließen des Schaltelements 3 wird immer wieder wiederholt, bis der Ansteuerschaltung 5 kein An- steuerbefehl mehr vorgegeben ist. Es erfolgt also eine Zweipunktregelung des Schützstromes I.The control circuit 5 is connected to the current sensor 2. The contactor current I can thus be detected and regulated. The control takes place in such a way that the switching element 3 is initially closed. This causes the contactor current I to rise. When the contactor current I reaches a maximum current I max , the switching element 3 is opened. The contactor current I is thus reduced via the freewheeling diode 4. When the contactor current I reaches a minimum current I min , the switching element 3 is closed again. The opening and closing of the switching element 3 will repeated repeatedly until the control circuit 5 is no longer given a control command. There is therefore a two-point control of the contactor current I.
Aufgrund der Ausbildung der Ansteuerschaltung 5 als Mikroprozessor 5 sind der Minimalstrom Imin und der Maximalstrom Imax auf einfache Weise der Ansteuerschaltung 5 als Parameter vorgebbar. Sie sind also vorwählbar.Due to the design of the drive circuit 5 as a microprocessor 5, the minimum current I m i n and the maximum current I max can be predefined in a simple manner, the drive circuit 5 as a parameter. So you can select them.
Gemäß FIG 1 sind die Ansteuerschaltung 5 und der Stromfühler 2 mit einem gemeinsamen Versorgungsanschluß 8 für die Schützschaltung verbunden. Dadurch ist eine direkte Erfassung des Schützstromes I ohne eine Potentialverschiebung zwischen der Ansteuerschaltung 5 und dem Stromfühler 2 möglich.According to FIG. 1, the control circuit 5 and the current sensor 2 are connected to a common supply connection 8 for the contactor circuit. This enables direct detection of the contactor current I without a potential shift between the control circuit 5 and the current sensor 2.
Mit der erfindungsgemäßen Schützschaltung ist ein leistungs- optimierter Betrieb der Schützschaltung innerhalb weiter Grenzen einer Versorgungsspannung Vc möglich. Diese kann z.B. zwischen 80 % und 150 % ihres Nennwerts schwanken, wobei dennoch die Betriebssicherheit der Schützschaltung erhalten bleibt und die Leistungsaufnahme der Schützschaltung minimiert ist. With the contactor circuit according to the invention, power-optimized operation of the contactor circuit is possible within wide limits of a supply voltage Vc. This can e.g. fluctuate between 80% and 150% of their nominal value, while the operational safety of the contactor circuit is retained and the power consumption of the contactor circuit is minimized.

Claims

Patentansprüche claims
1. Schützschaltung mit einer Schützspule (1), einem Stromfühler (2), einem Schaltelement (3), einer Freilaufdiode (4) und einer Ansteuerschaltung (5),1. contactor circuit with a contactor coil (1), a current sensor (2), a switching element (3), a free-wheeling diode (4) and a control circuit (5),
- wobei mit der Schützspule (1) mindestens ein Lastkontakt (6) betätigbar ist,- With the contactor coil (1) at least one load contact (6) can be actuated,
- wobei der Stromfühler (2) und das Schaltelement (3) mit der Schützspule (1) in Reihe geschaltet sind, - wobei die Freilaufdiode (4) die Schützspule (1) und den Stromfühler (2) übergreift,- The current sensor (2) and the switching element (3) are connected in series with the contactor coil (1), - The free-wheeling diode (4) engages over the contactor coil (1) and the current sensor (2),
- wobei der Ansteuerschaltung (5) ein Ansteuerbefehl vorgebbar ist, aufgrund dessen das Schaltelement (3) betätigbar ist, - wobei die Ansteuerschaltung (5) mit dem Stromfühler (2) verbunden ist, so daß ein durch die Schützspule (1) fließender Schützstrom (I) regelbar ist.- The control circuit (5) can be given a control command, on the basis of which the switching element (3) can be actuated, - the control circuit (5) being connected to the current sensor (2), so that a contactor current (1) flowing through the contactor coil (1) I) is adjustable.
2. Schützschaltung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß der Stromfühler (2) als Widerstand (2) ausgebildet ist.2. Contactor circuit according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the current sensor (2) is designed as a resistor (2).
3. Schützschaltung nach Anspruch 1 oder 2, d a d u r c h g e k e n n z e i c h n e t , daß die Schützspule (1) zwischen dem Stromfühler (2) und dem Schaltelement (3) angeordnet ist.3. Contactor circuit according to claim 1 or 2, so that the contactor coil (1) is arranged between the current sensor (2) and the switching element (3).
4. Schützschaltung nach Anspruch 3, d a d u r c h g e k e n n z e i c h n e t , daß die Ansteuerschaltung (5) und der Stromfühler (2) mit einem gemeinsamen Versorgungsanschluß (8) für die Schütz - Schaltung verbunden sind. 4. Contactor circuit according to claim 3, characterized in that the control circuit (5) and the current sensor (2) are connected to a common supply connection (8) for the contactor circuit.
5. Schützschaltung nach Anspruch 4, d a d u r c h g e k e n n z e i c h n e t , daß die Ansteuerschaltung (5) vom Schaltelement (3) potentialgetrennt ist.5. Contactor circuit according to claim 4, that the control circuit (5) is electrically isolated from the switching element (3).
6. Schützschaltung nach einem der obigen Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß das Schaltelement (3) geöffnet wird, wenn der Schützstrom (I) einen Maximalstrom (Imax) erreicht, und daß das Schaltelement (3) geschlossen wird, wenn der Schützstrom (I) einen Minimalstrom (Imin) erreicht.6. Contactor circuit according to one of the above claims, characterized in that the switching element (3) is opened when the contactor current (I) reaches a maximum current (I max ), and in that the switching element (3) is closed when the contactor current (I) a minimum current (I m i n) is reached.
7. Schützschaltung nach Anspruch 6, d a d u r c h g e k e n n z e i c h n e t , daß der Minimal- und/oder der Maximalstrom (Imax, Imin) vorwählbar sind.7. Contactor circuit according to claim 6, characterized in that the minimum and / or the maximum current (I max , Imin) can be preselected.
8. Schützschaltung nach einem der obigen Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß die Ansteuerschaltung (5) als Mikroprozessor (5) ausgebildet ist. 8. Contactor circuit according to one of the above claims, that the control circuit (5) is designed as a microprocessor (5).
PCT/DE2000/001940 1999-06-25 2000-06-13 Protective circuit WO2001001538A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19929225 1999-06-25
DE19929225.6 1999-06-25

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014060183A1 (en) * 2012-10-18 2014-04-24 Robert Bosch Gmbh Control circuit for at least one contactor and method for operating at least one contactor
WO2014060184A1 (en) * 2012-10-18 2014-04-24 Robert Bosch Gmbh Control circuit for at least two contactors and method for operating at least two contactors

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2425585A1 (en) * 1973-07-19 1975-02-06 Jenoptik Jena Gmbh ARRANGEMENT FOR FAST AND LOW-LOSS SWITCHING OF INDUCTIVITIES
EP0319669A2 (en) * 1987-12-10 1989-06-14 WABCO Vermögensverwaltungs-GmbH Current regulator
DE4134056A1 (en) * 1990-10-18 1992-04-23 Zahnradfabrik Friedrichshafen Electromagnetic adjuster current controller - has measuring resistor incorporated in lead between power transistor and magnetic coil
DE19711768A1 (en) * 1997-03-21 1998-09-24 Mannesmann Rexroth Ag Electromagnetic actuator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2425585A1 (en) * 1973-07-19 1975-02-06 Jenoptik Jena Gmbh ARRANGEMENT FOR FAST AND LOW-LOSS SWITCHING OF INDUCTIVITIES
EP0319669A2 (en) * 1987-12-10 1989-06-14 WABCO Vermögensverwaltungs-GmbH Current regulator
DE4134056A1 (en) * 1990-10-18 1992-04-23 Zahnradfabrik Friedrichshafen Electromagnetic adjuster current controller - has measuring resistor incorporated in lead between power transistor and magnetic coil
DE19711768A1 (en) * 1997-03-21 1998-09-24 Mannesmann Rexroth Ag Electromagnetic actuator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014060183A1 (en) * 2012-10-18 2014-04-24 Robert Bosch Gmbh Control circuit for at least one contactor and method for operating at least one contactor
WO2014060184A1 (en) * 2012-10-18 2014-04-24 Robert Bosch Gmbh Control circuit for at least two contactors and method for operating at least two contactors
CN104718099B (en) * 2012-10-18 2020-09-01 罗伯特·博世有限公司 Control circuit for at least one contactor and method for operating at least one contactor

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