EP0901057B1 - Current regulation circuit - Google Patents

Current regulation circuit Download PDF

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Publication number
EP0901057B1
EP0901057B1 EP98114690A EP98114690A EP0901057B1 EP 0901057 B1 EP0901057 B1 EP 0901057B1 EP 98114690 A EP98114690 A EP 98114690A EP 98114690 A EP98114690 A EP 98114690A EP 0901057 B1 EP0901057 B1 EP 0901057B1
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EP
European Patent Office
Prior art keywords
voltage
arrangement
measuring
switching device
current
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.)
Revoked
Application number
EP98114690A
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German (de)
French (fr)
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EP0901057A3 (en
EP0901057A2 (en
Inventor
Kurt Dr. Stoll
Walter Suchy
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Festo SE and Co KG
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Festo SE and Co KG
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Application filed by Festo SE and Co KG filed Critical Festo SE and Co KG
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Publication of EP0901057A3 publication Critical patent/EP0901057A3/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
    • H01F7/1844—Monitoring or fail-safe circuits
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
    • H01F7/1805—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current

Definitions

  • the present invention relates to a circuit device for controlling a flowing through a magnet coil arrangement Coil current, with a control device that has a measuring arrangement for measuring the coil current and the Coil current as a function of the measured coil current regulates, with means for generating a through the magnet coil arrangement flowing starting current and with a switching device to reduce the coil current after expiration a tightening period to a shorter one, until the end of a Switching signal flowing, clocked holding current.
  • the object of the present invention is therefore a To provide circuit device of the type mentioned, which generates a much lower power loss and at the same time of a largely arbitrary voltage can be supplied.
  • This object is achieved in that also the starting current is regulated by clocking and that the measuring arrangement is switched outside the freewheeling circuit is in which during the present in the clock breaks Free running state of the magnet coil arrangement of the Freewheeling current flows.
  • the starting current Due to the clocking of the starting current, it can be used for supply input voltage serving the circuit device also greater than the desired voltage value assume that the RMS value of the input voltage can be lowered. The voltage value of the Therefore, input voltage does not have to reach the desired one as before Starting current must be adjusted. Because the measuring arrangement switched outside the freewheeling circuit is flowing in the clock breaks in which the solenoid arrangement assumes their freewheeling state and not on the Supply voltage is present, that of the solenoid arrangement induced freewheeling current not by the measuring arrangement. As a result, the freewheeling current is none Power loss generated in the measuring arrangement. The total Power loss is reduced significantly and offers metrological advantages.
  • a rectifier arrangement is expediently provided, the one input voltage in one for power supply the supply DC voltage serving the device reshapes. In this way, the circuit device to a DC or AC voltage as the input voltage be created.
  • the supply voltage of the supply voltage corresponds to the magnet coil arrangement.
  • the supply voltage is accordingly clocked Voltage or current source fed the control device, so that no additional input voltage for supply the control device is necessary.
  • Fig. 1 shows an embodiment of the circuit device 1.
  • the circuit device 1 has two input terminals 2, 3, to which an input voltage UO from the outside can be created.
  • the input terminals 2, 3 are with a Rectifier arrangement 6 connected, the example of a diode bridge circuit 7 is formed.
  • the rectifier arrangement formed by the diode bridge circuit 7 the input voltage UO becomes a DC supply voltage UG reshaped.
  • the positive pole of the DC supply voltage UG is connected to a positive output 8 Rectifier arrangement 6, the one with a supply line 9 is connected, and a negative output 10 of Rectifier arrangement 6, on which the negative pole of the DC supply voltage is present, is at ground potential GND placed (0 volt). Between the supply line 9 and Ground potential GND is the DC supply voltage UG on.
  • the circuit device 1 also has a Magnetic coil arrangement 14, on the one hand with the supply line 9 is connected and on the other hand via a Series connection from a light emitting diode 13, the switching path between input E and output A of a controlled Switch 15 and a measuring resistor 16 connected to ground GND is.
  • the magnet coil arrangement is 14 formed by a single magnetic coil, whose equivalent circuit from a series connection of a ideal coil 22 and an ohmic coil resistor 23 is formed.
  • a free-wheeling diode 17 is connected, the cathode of which the supply line 9 is connected and its anode thus in connection with the input E of the controlled Switch 15 stands.
  • the solenoid assembly 14, the Light-emitting diode 13 and the freewheeling diode 17 form together a free-wheeling circuit 18.
  • the LED 13 is optional and not for the function of the circuit device 1 is needed. You can also by other display elements to be replaced or supplemented if so desired should be.
  • the light-emitting diode 13 serves to pass one through the Magnetic coil arrangement 14 flowing coil current IS optically display. As soon as a coil current IS flows, the lights up LED 13 (status display).
  • control line 19 On for switching the controlled switch 15 on and off serving control input S is via a control line 19 connected to a control output AS of a control unit 20.
  • the control line 19 further connects the Control output AS of the control unit 20 with another Control input S of a controlled measuring switch 21, whose switching distance between an input E and a Output A is turned on in a measuring line 24, which the Connection side of the measuring resistor facing away from GND 16 connects to a measurement input M of the control unit 20.
  • the measuring switch 21 When the measuring switch 21 is turned on, the Measuring resistor 16 falling measuring voltage UM at the measuring input M the control unit 20.
  • the controlled switch 15 and the controlled measuring switch 21 can, for example, as a semiconductor switch and here in particular be designed as MOS-FETs. Of course could also semiconductor types other than controlled switches are used.
  • the control unit 20 also has a switch input UE, which is connected to a switching device 25 is.
  • the control unit 20, the controlled switch 15, the controlled measuring switch 21, the measuring resistor 16 and the Switching device 25 together form a control device 26.
  • a clocked voltage source 29 is provided, for example, which has a regulator supply voltage at its output UR memorizes the present Embodiment with the control unit 20 and Switching device 25 is connected to its supply.
  • the clocked voltage source 29 is fed by the DC supply voltage UG.
  • a clocked Power source are provided instead of the clocked voltage source 29 also a clocked Power source are provided.
  • circuit device 1 The function of the circuit device 1 is as follows explained in detail with reference to FIGS. 2a-c.
  • the magnet coil arrangement 14 can, for example, be of a Solenoid coil of a solenoid valve can be formed, with the Tightening the valve spool first a high starting current IA is required, which is then used to hold the tightened state in a lower holding current IH can be lowered. Accordingly, flows first through the Solenoid assembly 14 during a tightening period TA the starting current IA, which after the tightening period TA is lowered into the holding current IH.
  • controlled switch 15 and the Controlled measuring switch 21 via separate control outputs to control the control unit 20.
  • An evaluation device of the control unit 20 compares now the measured value of the measuring voltage UM with a internal reference voltage, the controlled switch 15 opened or dependent on the comparison result is closed again.
  • the internal reference voltage of the control unit 20 could for example, have a triangular shape and with the differential voltage from the nominal value of the measuring voltage UM minus the actual value of the measuring voltage UM can be compared. at each "intersection" from the differential voltage and the The controlled switch 15 becomes the reference voltage switched. If the differential voltage is greater than that Reference voltage, so the controlled switch 15th otherwise it is closed.
  • This The principle is known from DE-29 60 0866. in principle could be any other regulatory process here be used.
  • the switching device causes 25 at the changeover input UE of the control unit 20 a switching signal, whereby the coil current IS from its starting current value to that corresponding to the holding current IH Value is reduced.
  • the regulation of the holding current IH takes place analogously to that of the starting current IA by clocking with the difference that the setpoint of Measuring voltage UM at measuring resistor 16 is correspondingly lower is.
  • the holding current IH flows through the for so long Solenoid assembly 14 until the DC supply voltage UG by switching off the input voltage UO is also switched off and a falling edge 33 having.
  • the coil current IS is then reduced in an e-function-like manner up to zero.
  • the input voltage UO or the supply DC voltage UG thus represent represents a switching signal that occurs when the input voltage is switched on UO or the supply voltage UG den Start of the tightening phase and when the input voltage is switched off UO or the supply voltage UG the end the holding phase. Switching off the input voltage UO and thus the DC supply voltage UG during the suit period doesn't make sense because then the valve slide is not tightened securely can.
  • the tightening period TA is preferred chosen just so long that the magnet coil arrangement 14 the associated valve spool safely can switch.
  • Due to the rectifier arrangement 6 can be used as the input voltage UO DC or AC voltages are used become.
  • the size of the input voltage UO is so too choose at least the one during the suit period through the magnet coil arrangement 14 flowing current IA guaranteed. Larger input voltages UO than that required minimum values are in the case of the invention Circuit device 1 is also possible, since both pulling current IA and holding current IH reduced by clocking can be.
  • the input voltage UO in the range of 24 V to 230 V DC or AC voltage.
  • the clocked voltage source 29 is also from the DC supply voltage UG supplies and delivers at your Output the clocked, regulated regulator supply voltage UR, so that also for the control device 26 no separate external power supply required is.
  • the necessary to supply the control device 26 Controller supply voltage UR is determined by means of the clocked voltage source 29 and the rectifier arrangement 6 obtained from the input voltage UO.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Electrical Variables (AREA)
  • Control Of Voltage And Current In General (AREA)
  • Relay Circuits (AREA)
  • Measurement Of Current Or Voltage (AREA)

Description

Die vorliegende Erfindung betrifft eine Schaltungsvorrichtung zur Regelung eines durch eine Magnetspulenanordnung fließenden Spulenstromes, mit einer Regeleinrichtung, die eine Mess-anordnung zum Messen des Spulenstromes aufweist und die den Spulenstrom in Abhängigkeit von der gemessenen Spulenstromstärke regelt, mit Mitteln zur Erzeugung eines durch die Magnetspulenanordnung fließenden Anzugsstromes und mit einer Umschalteinrichtung zur Absenkung des Spulenstromes nach Ablauf einer Anzugszeitdauer auf einen geringeren, bis zum Ende eines Schaltsignals fließenden, getakteten Haltestrom.The present invention relates to a circuit device for controlling a flowing through a magnet coil arrangement Coil current, with a control device that has a measuring arrangement for measuring the coil current and the Coil current as a function of the measured coil current regulates, with means for generating a through the magnet coil arrangement flowing starting current and with a switching device to reduce the coil current after expiration a tightening period to a shorter one, until the end of a Switching signal flowing, clocked holding current.

Bei einer derartigen z.B. aus der DE 29 600 866 U bekannten Schaltvorrichtung wird der während der Anzugszeitdauer anliegende Anzugsstrom nach Ablauf dieser Anzugszeitdauer heruntergetaktet, wobei in den Taktpausen, das heißt bei abgetrennter Spannungsversorgung, in der Magnetspulenanordnung ein Freilaufstrom induziert wird, der durch die Messanordnung fließt, wodurch eine große Verlustleistung erzeugt wird. Ferner muss die die Schaltungsvorrichtung versorgende Eingangsspannung dem gewünschten Stromwert des Anzugsstromes angepasst sein und somit in Form einer einen bestimmten Spannungswert aufweisenden Gleichspannung vorliegen.In such a e.g. known from DE 29 600 866 U. Switching device is applied during the tightening period Starting current is clocked down after the end of this tightening period, where in the clock breaks, that is, with separated Power supply, in the magnet coil arrangement a freewheeling current is induced by the measuring arrangement flows, creating a large power loss. Further must be the input voltage supplying the circuit device adapted to the desired current value of the starting current be and therefore in Form of a certain voltage value DC voltage is present.

Aufgabe der vorliegenden Erfindung ist es demnach, eine Schaltungsvorrichtung der eingangs genannten Art zu schaffen, die eine wesentlich geringere Verlustleistung erzeugt und gleichzeitig von einer weitgehend beliebigen Spannung versorgt werden kann.The object of the present invention is therefore a To provide circuit device of the type mentioned, which generates a much lower power loss and at the same time of a largely arbitrary voltage can be supplied.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß auch der Anzugsstrom durch Taktung geregelt ist und daß die Meßanordnung außerhalb des Freilaufstromkreises geschaltet ist, in dem während des in den Taktpausen vorliegenden Freilaufzustands der Magnetspulenanordnung der Freilaufstrom fließt.This object is achieved in that also the starting current is regulated by clocking and that the measuring arrangement is switched outside the freewheeling circuit is in which during the present in the clock breaks Free running state of the magnet coil arrangement of the Freewheeling current flows.

Auf Grund der Taktung des Anzugsstromes kann die zur Versorgung der Schaltungsvorrichtung dienende Eingangsspannung auch größere als den gewünschten Spannungswert annehmen, da durch die Taktung der Effektivwert der Eingangsspannung abgesenkt werden kann. Der Spannungswert der Eingangsspannung muß deshalb nicht wie bisher an den gewünschten Anzugsstrom angepaßt sein. Dadurch, daß die Meßanordnung außerhalb des Freilaufstromkreises geschaltet ist, fließt in den Taktpausen, in denen die Magnetspulenanordnung ihren Freilaufzustand einnimmt und nicht an der Versorgungsspannung anliegt, der von der Magnetspulenanordnung induzierte Freilaufstrom nicht durch die Meßanordnung. Dies hat zur Folge, daß der Freilaufstrom keine Verlustleistung in der Meßanordnung erzeugt. Die insgesamt anfallende Verlustleistung ist somit wesentlich reduziert und bietet meßtechnische Vorteile.Due to the clocking of the starting current, it can be used for supply input voltage serving the circuit device also greater than the desired voltage value assume that the RMS value of the input voltage can be lowered. The voltage value of the Therefore, input voltage does not have to reach the desired one as before Starting current must be adjusted. Because the measuring arrangement switched outside the freewheeling circuit is flowing in the clock breaks in which the solenoid arrangement assumes their freewheeling state and not on the Supply voltage is present, that of the solenoid arrangement induced freewheeling current not by the measuring arrangement. As a result, the freewheeling current is none Power loss generated in the measuring arrangement. The total Power loss is reduced significantly and offers metrological advantages.

Vorteilhafte Weiterbildungen des Gegenstands der Erfindung gehen aus den Unteransprüchen hervor.Advantageous developments of the object of the invention emerge from the subclaims.

Zweckmäßigerweise ist eine Gleichrichteranordnung vorgesehen, die eine Eingangsspannung in eine zur Spannungsversorgung der Vorrichtung dienende Versorgungsgleichspannung umformt. Auf diese Weise kann die Schaltungsvorrichtung an eine Gleich- oder Wechselspannung als Eingangsspannung angelegt werden.A rectifier arrangement is expediently provided, the one input voltage in one for power supply the supply DC voltage serving the device reshapes. In this way, the circuit device to a DC or AC voltage as the input voltage be created.

Vorteilhafterweise ist zur Spannungs- bzw. Stromversorgung der Regeleinrichtung eine getaktete Spannungs- bzw. Stromquelle vorhanden, deren Versorgungsspannung der Versorgungsspannung der Magnetspulenanordnung entspricht. Aus der zur Versorgung der Magnetspulenanordnung dienenden Versorgungsspannung wird demnach mittels der getakteten Spannungs- bzw. Stromquelle die Regeleinrichtung gespeist, so daß keine zusätzliche Eingangsspannung zur Versorgung der Regeleinrichtung notwendig ist. It is advantageous for voltage or power supply the control device a clocked voltage or current source available, the supply voltage of the supply voltage corresponds to the magnet coil arrangement. Out the one used to supply the magnet coil arrangement The supply voltage is accordingly clocked Voltage or current source fed the control device, so that no additional input voltage for supply the control device is necessary.

Im folgenden wird die erfindungsgemäße Schaltungsvorrichtung anhand der Zeichnung näher erläutert. Es zeigen:

Fig. 1
ein Ausführungsbeispiel einer Schaltungsvorrichtung,
Fig. 2a
einen beispielhaft gewählten Spannungsverlauf der Eingangsspannung in Abhängigkeit von der Zeit,
Fig. 2b
den Verlauf des getakteten Spulenstromes in Abhängigkeit von der Zeit und
Fig. 2c
den Verlauf der getakteten Spulenspannung in Abhängigkeit von der Zeit.
The circuit device according to the invention is explained in more detail below with reference to the drawing. Show it:
Fig. 1
an embodiment of a circuit device,
Fig. 2a
an exemplary selected voltage curve of the input voltage as a function of time,
Fig. 2b
the course of the clocked coil current as a function of time and
Fig. 2c
the course of the clocked coil voltage as a function of time.

Fig. 1 zeigt ein Ausführungsbeispiel der Schaltungsvorrichtung 1. Die Schaltungsvorrichtung 1 verfügt über zwei Eingangsklemmen 2, 3, an die von außen eine Eingangsspannung UO anlegbar ist. Die Eingangsklemmen 2, 3 sind mit einer Gleichrichteranordnung 6 verbunden, die beispielsgemäß von einer Diodenbrückenschaltung 7 gebildet ist. Mittels der von der Diodenbrückenschaltung 7 gebildeten Gleichrichteranordnung wird die Eingangsspannung UO in eine Versorgungsgleichspannung UG umgeformt. Der Pluspol der Versorgungsgleichspannung UG liegt an einem positiven Ausgang 8 der Gleichrichteranordnung 6 an, der mit einer Versorgungsleitung 9 verbunden ist, und ein negativer Ausgang 10 der Gleichrichteranordnung 6, an dem der Minuspol der Versorgungsgleichspannung anliegt, ist auf Massepotential GND gelegt (0 Volt). Zwischen der Versorgungsleitung 9 und Massepotential GND liegt die Versorgungsgleichspannung UG an.Fig. 1 shows an embodiment of the circuit device 1. The circuit device 1 has two input terminals 2, 3, to which an input voltage UO from the outside can be created. The input terminals 2, 3 are with a Rectifier arrangement 6 connected, the example of a diode bridge circuit 7 is formed. By means of the rectifier arrangement formed by the diode bridge circuit 7 the input voltage UO becomes a DC supply voltage UG reshaped. The positive pole of the DC supply voltage UG is connected to a positive output 8 Rectifier arrangement 6, the one with a supply line 9 is connected, and a negative output 10 of Rectifier arrangement 6, on which the negative pole of the DC supply voltage is present, is at ground potential GND placed (0 volt). Between the supply line 9 and Ground potential GND is the DC supply voltage UG on.

In Abwandlung zur bevorzugten Ausführungsform gemäß Fig. 1 ist es möglich, einen Glättungskondensator vorzusehen.In modification of the preferred embodiment according to 1, it is possible to provide a smoothing capacitor.

Die Schaltungsvorrichtung 1 verfügt ferner über eine Magnetspulenanordnung 14, die einerseits mit der Versorgungsleitung 9 verbunden ist und andererseits über eine Reihenschaltung aus einer Leuchtdiode 13, der Schaltstrecke zwischen Eingang E und Ausgang A eines gesteuerten Schalters 15 und einen Meßwiderstand 16 mit Masse GND verbunden ist.The circuit device 1 also has a Magnetic coil arrangement 14, on the one hand with the supply line 9 is connected and on the other hand via a Series connection from a light emitting diode 13, the switching path between input E and output A of a controlled Switch 15 and a measuring resistor 16 connected to ground GND is.

Beim vorliegenden Ausführungsbeispiel ist die Magnetspulenanordnung 14 von einer einzigen Magnetspule gebildet, deren Ersatzschaltbild aus einer Reihenschaltung einer idealen Spule 22 und einem Ohmschen Spulenwiderstand 23 gebildet ist.In the present exemplary embodiment, the magnet coil arrangement is 14 formed by a single magnetic coil, whose equivalent circuit from a series connection of a ideal coil 22 and an ohmic coil resistor 23 is formed.

Parallel zur Magnetspulenanordnung 14 und der Leuchtdiode 13 ist eine Freilaufdiode 17 geschaltet, deren Kathode mit der Versorgungsleitung 9 verbunden ist und deren Anode somit in Verbindung mit dem Eingang E des gesteuerten Schalters 15 steht. Die Magnetspulenanordnung 14, die Leuchtdiode 13 und die Freilaufdiode 17 bilden zusammen einen Freilaufstromkreis 18. In diesem Zusammenhang sei darauf hingewiesen, daß die Leuchtdiode 13 optional ist und für die Funktion der Schaltungsvorrichtung 1 nicht benötigt wird. Sie kann des weiteren durch andere Anzeigeelemente ersetzt oder ergänzt werden, falls dies wünschenswert sein sollte. In der beispielsgemäßen Schaltungsvorrichtung 1 dient die Leuchtdiode 13 dazu, einen durch die Magnetspulenanordnung 14 fließenden Spulenstrom IS optisch anzuzeigen. Sobald ein Spulenstrom IS fließt, leuchtet die Leuchtdiode 13 (Statusanzeige).Parallel to the magnet coil arrangement 14 and the light emitting diode 13, a free-wheeling diode 17 is connected, the cathode of which the supply line 9 is connected and its anode thus in connection with the input E of the controlled Switch 15 stands. The solenoid assembly 14, the Light-emitting diode 13 and the freewheeling diode 17 form together a free-wheeling circuit 18. In this context pointed out that the LED 13 is optional and not for the function of the circuit device 1 is needed. You can also by other display elements to be replaced or supplemented if so desired should be. In the exemplary circuit device 1, the light-emitting diode 13 serves to pass one through the Magnetic coil arrangement 14 flowing coil current IS optically display. As soon as a coil current IS flows, the lights up LED 13 (status display).

Ein zum Ein- und Ausschalten des gesteuerten Schalters 15 dienende Steuereingang S ist über eine Steuerleitung 19 mit einem Steuerausgang AS einer Steuereinheit 20 verbunden. Die Steuerleitung 19 verbindet des weiteren den Steuerausgang AS der Steuereinheit 20 mit einem weiteren Steuereingang S eines gesteuerten Meßschalters 21, dessen Schaltstrecke zwischen einem Eingang E und einem Ausgang A in eine Meßleitung 24 eingeschaltet ist, die die der Masse GND abgewandte Anschlußseite des Meßwiderstandes 16 mit einem Meßeingang M der Steuereinheit 20 verbindet. Bei eingeschaltetem Meßschalter 21 liegt demnach die am Meßwiderstand 16 abfallende Meßspannung UM am Meßeingang M der Steuereinheit 20 an.On for switching the controlled switch 15 on and off serving control input S is via a control line 19 connected to a control output AS of a control unit 20. The control line 19 further connects the Control output AS of the control unit 20 with another Control input S of a controlled measuring switch 21, whose switching distance between an input E and a Output A is turned on in a measuring line 24, which the Connection side of the measuring resistor facing away from GND 16 connects to a measurement input M of the control unit 20. When the measuring switch 21 is turned on, the Measuring resistor 16 falling measuring voltage UM at the measuring input M the control unit 20.

Der gesteuerte Schalter 15 und der gesteuerte Meßschalter 21 können beispielsweise als Halbleiterschalter und hierbei insbesondere als MOS-FETs ausgebildet sein. Selbstverständlich könnten auch andere Halbleiterarten als gesteuerte Schalter eingesetzt werden.The controlled switch 15 and the controlled measuring switch 21 can, for example, as a semiconductor switch and here in particular be designed as MOS-FETs. Of course could also semiconductor types other than controlled switches are used.

Die Steuereinheit 20 verfügt außerdem über einen Umschalteingang UE, der mit einer Umschalteinrichung 25 verbunden ist. Die Steuereinheit 20, der gesteuerte Schalter 15, der gesteuerte Meßschalter 21, der Meßwiderstand 16 und die Umschalteinrichtung 25 bilden zusammen eine Regeleinrichtung 26. Zur Spannungsversorgung der Regeleinrichtung 26 ist beispielsgemäß eine getaktete Spannungsquelle 29 vorgesehen, die an ihrem Ausgang eine Regeleinrichtungsversorgungsspannung UR einprägt, die beim vorliegenden Ausführungsbeispiel mit der Steuereinheit 20 und der Umschalteinrichtung 25 zu deren Versorgung verbunden ist. Gespeist wird die getaktete Spannungsquelle 29 von der Versorgungsgleichspannung UG. Grundsätzlich könnte anstatt der getakteten Spannungsquelle 29 auch eine getaktete Stromquelle vorgesehen werden.The control unit 20 also has a switch input UE, which is connected to a switching device 25 is. The control unit 20, the controlled switch 15, the controlled measuring switch 21, the measuring resistor 16 and the Switching device 25 together form a control device 26. To supply voltage to the control device 26 a clocked voltage source 29 is provided, for example, which has a regulator supply voltage at its output UR memorizes the present Embodiment with the control unit 20 and Switching device 25 is connected to its supply. The clocked voltage source 29 is fed by the DC supply voltage UG. Basically, instead of the clocked voltage source 29 also a clocked Power source are provided.

Die Funktion der Schaltungsvorrichtung 1 wird im folgenden anhand der Fig. 2a - c im einzelnen erläutert. The function of the circuit device 1 is as follows explained in detail with reference to FIGS. 2a-c.

Die Magnetspulenanordnung 14 kann beispielsweise von einer Magnetspule eines Magnetventils gebildet sein, wobei zum Anziehen des Ventilschiebers zunächst ein hoher Anzugsstrom IA erforderlich ist, der anschließend zum Halten des angezogenen Zustands in einen geringeren Haltestrom IH abgesenkt werden kann. Demnach fließt zunächst durch die Magnetspulenanordung 14 während einer Anzugszeitdauer TA der Anzugsstrom IA, der nach Ablauf der Anzugszeitdauer TA in den Haltestrom IH abgesenkt wird.The magnet coil arrangement 14 can, for example, be of a Solenoid coil of a solenoid valve can be formed, with the Tightening the valve spool first a high starting current IA is required, which is then used to hold the tightened state in a lower holding current IH can be lowered. Accordingly, flows first through the Solenoid assembly 14 during a tightening period TA the starting current IA, which after the tightening period TA is lowered into the holding current IH.

Im Ruhezustand der Schaltungsvorrichtung 1 ist der gesteuerte Schalter 15 geöffnet. Sobald von außen die Eingangsspannung UO angelegt wird, weist die Versorgungsgleichspannung UG eine steigende Flanke 32 auf und die Anzugszeitdauer TA beginnt zu laufen. Außerdem erzeugt die getaktete Spannungsquelle 29 die Regeleinrichtungsversorgungsspannung UR. Die Steuereinheit 20 veranlaßt dann das Schließen des Schalters 15.In the idle state of the circuit device 1 is the controlled one Switch 15 opened. As soon as the outside Input voltage UO is applied, has the DC supply voltage UG a rising edge 32 and the Tightening period TA begins. It also creates the clocked voltage source 29 the controller supply voltage UR. The control unit 20 then initiates closing switch 15.

Auf Grund der Versorgungsgleichspannung UG fällt an der Magnetspulenanordnung 14 eine Spulenspannung US ab, die einen im wesentlichen gemäß einer e-Funktion ansteigenden Spulenstrom IS verursacht. Proportional zum Spulenstrom IS steigt die am Meßwiderstand 16 abfallende Meßspannung UM an. Da der Meßschalter 21 wie auch der gesteuerte Schalter 15 mittels des Steuerausgangs AS der Steuereinheit 20 angesteuert wird, ist dieser ebenfalls geschlossen, so daß die Meßspannung UM am Meßeingang M der Steuereinheit 20 anliegt. Der Spulenstrom IS fließt fast vollständig durch den Meßwiderstand 16. Vorteilhafterweise ist der Meßeingang M hochohmig, so daß der über die Meßleitung 24 in die Steuereinheit 20 fließende Strom gering ist.Due to the DC supply voltage UG falls on the Magnetic coil assembly 14 from a coil voltage US, the one increasing essentially according to an e-function Coil current IS caused. Proportional to the coil current IS the measuring voltage UM falling across the measuring resistor 16 increases on. Since the measuring switch 21 as well as the controlled switch 15 by means of the control output AS of the control unit 20 is controlled, this is also closed, so that the measurement voltage UM at the measurement input M of the control unit 20 is applied. The coil current IS flows through almost completely the measuring resistor 16. Advantageously, the Measuring input M high impedance, so that the measuring line 24th current flowing into the control unit 20 is low.

Es wäre in Abwandlung des dargestellten Ausführungsbeispiels auch möglich, den gesteuerten Schalter 15 und den gesteuerten Meßschalter 21 über separate Ansteuerausgänge der Steuereinheit 20 anzusteuern.It would be a modification of the illustrated embodiment also possible, the controlled switch 15 and the Controlled measuring switch 21 via separate control outputs to control the control unit 20.

Eine Auswerteeinrichtung der Steuereinheit 20 vergleicht nun den gemessenen Wert der Meßspannung UM mit einer internen Vergleichsspannung, wobei der gesteuerte Schalter 15 in Abhängigkeit vom Vergleichsergebnis geöffnet bzw. wieder geschlossen wird.An evaluation device of the control unit 20 compares now the measured value of the measuring voltage UM with a internal reference voltage, the controlled switch 15 opened or dependent on the comparison result is closed again.

Bei geöffnetem Schalter 15 liegt am Meßwiderstand 16 kein gültiges Meßsignal an, da dieser stromlos ist, obwohl im Freilaufstromkreis 18 ein von der Magnetspulenanordnung 14 induzierter Freilaufstrom fließt. Aus diesem Grund ist der Meßschalter 21 ebenfalls geöffnet, so daß am Meßeingang M der Steuereinheit 20 kein Signal anliegt. Beim Ausführungsbeispiel verfügt der Meßschalter 21 über von einem sogenannten sample-and-hold-Glied gebildete Meßwertspeichermittel, die den dem Meßeingang M der Steuereinheit 20 zugeführten Spannungswert so lange halten, bis der Meßschalter 21 und damit auch der gesteuerte Schalter 15 wieder geschlossen sind und der nächste gültige Meßwert anliegt und damit der Meßeingang M der Steuereinheit 20 vom Meßschalter 21 ständig einen gültigen Meßwert erhält. Es versteht sich, daß die Meßwertspeichermittel alternativ auch in der Steuereinheit 20 ingetriert sein könnten.When switch 15 is open, there is no measurement resistor 16 valid measurement signal, since this is de-energized, although in Free-wheeling circuit 18 from the magnet coil arrangement 14 induced freewheeling current flows. For this reason, the Measuring switch 21 also opened, so that at the measuring input M the control unit 20 has no signal. In the embodiment has the measuring switch 21 of one so-called sample-and-hold element formed measurement value storage means, which are fed to the measurement input M of the control unit 20 Hold the voltage value until the measuring switch 21 and so that the controlled switch 15 is closed again are and the next valid measured value is pending and thus the Measuring input M of control unit 20 from measuring switch 21 constantly receives a valid measured value. It goes without saying that the measured value storage means alternatively in the Control unit 20 could be registered.

Die interne Vergleichsspannung der Steuereinheit 20 könnte beispielsweise einen dreieckförmigen Verlauf haben und mit der Differenzspannung aus Sollwert der Meßspannung UM minus dem Istwert der Meßspannung UM verglichen werden. Bei jedem "Schnittpunkt" aus der Differenzspannung und der Vergleichsspannung wird der gesteuerte Schalter 15 umgeschaltet. Ist die Differenzspannung größer als die Vergleichsspannung, so wird der gesteuerte Schalter 15 geöffnet, im anderen Fall wird er geschlossen. Dieses Prinzip ist aus der DE-29 60 0866 bekannt. Grundsätzlich könnte hier auch ein beliebiges anderes Regelungsverfahren eingesetzt werden.The internal reference voltage of the control unit 20 could for example, have a triangular shape and with the differential voltage from the nominal value of the measuring voltage UM minus the actual value of the measuring voltage UM can be compared. at each "intersection" from the differential voltage and the The controlled switch 15 becomes the reference voltage switched. If the differential voltage is greater than that Reference voltage, so the controlled switch 15th otherwise it is closed. This The principle is known from DE-29 60 0866. in principle could be any other regulatory process here be used.

Bei geöffnetem Schalter 15 wird die Magnetspulenanordnung 14 in den Freilaufzustand umgeschaltet, wobei in der Spule 22 der Freilaufstrom induziert wird, der im Freilaufstromkreis 18 fließt. Dadurch, daß der Meßwiderstand 16 mittels des geöffneten Schalters 15 vom Freilaufstromkreis 18 abgetrennt ist, ist dieser stromlos, so daß an ihm keine Verlustleistung erzeugt wird. Des weiteren wird die Steuereinheit 20 der Regeleinrichtung 26 vor zu großen Spannungen geschützt, da beim öffnen des Schalters 15 kurzzeitig Spannungsspitzen des induzierten Freilaufstromes möglich sind, die im Meßwiderstand 16 sehr hohe Meßspannungsspitzen erzeugen würden. Derartige Spannungsspitzen in der Meßspannung UM sind auf Grund der Abtrennung des Meßwiderstandes 16 vom Freilaufstromkreis 18 vermieden.When switch 15 is open, the magnet coil arrangement 14 switched to the freewheeling state, in the coil 22 the freewheeling current is induced in the freewheeling circuit 18 flows. The fact that the measuring resistor 16 by means of of the open switch 15 from the freewheeling circuit 18 is separated, this is de-energized, so that none of it Power loss is generated. Furthermore, the Control unit 20 of the control device 26 before too large Protected voltages because when switch 15 is opened brief voltage peaks of the induced freewheeling current are possible, the very high measuring voltage peaks in the measuring resistor 16 would generate. Such peaks in the measuring voltage UM are due to the separation of the Measuring resistor 16 avoided by the freewheeling circuit 18.

Nach Ablauf der Anzugszeitdauer TA verursacht die Umschalteinrichtung 25 am Umschalteingang UE der Steuereinheit 20 ein Umschaltsignal, wodurch der Spulenstrom IS von seinem Anzugsstromwert auf den dem Haltestrom IH entsprechenden Wert reduziert wird. Die Regelung des Haltestromes IH erfolgt dabei analog zu der des Anzugsstromes IA durch Taktung mit dem Unterschied, daß der Sollwert der Meßspannung UM am Meßwiderstand 16 entsprechend geringer ist. Der Haltestrom IH fließt so lange durch die Magnetspulenanordnung 14, bis die Versorgungsgleichspannung UG durch ein Abschalten der Eingangsspannung UO ebenfalls abgeschaltet wird und eine fallende Flanke 33 aufweist. Der Spulenstrom IS reduziert sich dann e-funktionsähnlich bis zum Wert Null. Die Eingangsspannung UO bzw. die Versorgungsgleichsspannung UG stellen somit ein Schaltsignal dar, das beim Einschalten der Eingangsspannung UO bzw. der Versorgungsgleichspannung UG den Beginn der Anzugsphase und beim Abschalten der Eingangsspannung UO bzw. der Versorgungsgleichspannung UG das Ende der Haltephase bestimmt. Ein Abschalten der Eingangsspannung UO und damit der Versorgungsgleichspannung UG während der Anzugszeitdauer ist nicht sinnvoll, da dann ein gesichertes Anziehen des Ventilschiebers nicht erfolgen kann. Die Anzugszeitdauer TA ist vorzugsweise gerade so lange gewählt, daß die Magnetspulenanordnung 14 des Magnetventiles den zugeordneten Ventilschieber sicher umschalten kann.After the tightening period TA has elapsed, the switching device causes 25 at the changeover input UE of the control unit 20 a switching signal, whereby the coil current IS from its starting current value to that corresponding to the holding current IH Value is reduced. The regulation of the holding current IH takes place analogously to that of the starting current IA by clocking with the difference that the setpoint of Measuring voltage UM at measuring resistor 16 is correspondingly lower is. The holding current IH flows through the for so long Solenoid assembly 14 until the DC supply voltage UG by switching off the input voltage UO is also switched off and a falling edge 33 having. The coil current IS is then reduced in an e-function-like manner up to zero. The input voltage UO or the supply DC voltage UG thus represent represents a switching signal that occurs when the input voltage is switched on UO or the supply voltage UG den Start of the tightening phase and when the input voltage is switched off UO or the supply voltage UG the end the holding phase. Switching off the input voltage UO and thus the DC supply voltage UG during the suit period doesn't make sense because then the valve slide is not tightened securely can. The tightening period TA is preferred chosen just so long that the magnet coil arrangement 14 the associated valve spool safely can switch.

Auf Grund der Gleichrichteranordnung 6 können als Eingangsspannung UO Gleich- oder Wechselspannungen verwendet werden. Die Größe der Eingangsspannung UO ist dabei so zu wählen, daß sie zumindest den während der Anzugszeitdauer durch die Magnetspulenanordnung 14 fließenden Anzugsstrom IA gewährleistet. Größere Eingangsspannungen UO als der geforderte Minimalwert sind bei der erfindungsgemäßen Schaltungsvorrichtung 1 ebenfalls möglich, da sowohl Anzugsstrom IA als auch Haltestrom IH durch Taktung abgesenkt werden können. Beispielsweise kann die Eingangsspannung UO im Bereich von 24 V bis 230 V Gleich- oder Wechselspannung liegen. Due to the rectifier arrangement 6 can be used as the input voltage UO DC or AC voltages are used become. The size of the input voltage UO is so too choose at least the one during the suit period through the magnet coil arrangement 14 flowing current IA guaranteed. Larger input voltages UO than that required minimum values are in the case of the invention Circuit device 1 is also possible, since both pulling current IA and holding current IH reduced by clocking can be. For example, the input voltage UO in the range of 24 V to 230 V DC or AC voltage.

Die getaktete Spannungsquelle 29 wird ebenfalls aus der Versorgungsgleichspannung UG versorgt und liefert an ihrem Ausgang die getaktete, geregelte Regeleinrichtungsversorgungsspannung UR, so daß auch für die Regeleinrichtung 26 keine gesonderte externe Spannungsversorgung notwendig ist. Die zur Versorgung der Regeleinrichtung 26 notwendige Regeleinrichtungsversorgungsspannung UR wird mittels der getakteten Spannungsquelle 29 und der Gleichrichteranordnung 6 aus der Eingangsspannung UO gewonnen.The clocked voltage source 29 is also from the DC supply voltage UG supplies and delivers at your Output the clocked, regulated regulator supply voltage UR, so that also for the control device 26 no separate external power supply required is. The necessary to supply the control device 26 Controller supply voltage UR is determined by means of the clocked voltage source 29 and the rectifier arrangement 6 obtained from the input voltage UO.

Claims (13)

  1. Switching device for the control of a coil current (IS) flowing through a solenoid arrangement (14), with a control device (26) provided with a measuring arrangement (16, 21) for measuring the coil current (IS) and controlling the coil current (IS) in dependence on the measured coil current value, with means for generating a pick-up current (IA) flowing through the solenoid arrangement (14), and with a change-over device (25) for reducing the coil current (IS), at the end of a pick-up time (TA), to a lower clocked holding current (IH) flowing until the end of a switching signal (UG or UO), characterised in that the control device (26) is provided with means for clocking the pull-in current (IA) and in that the measuring arrangement (16, 21) is connected outside the free-wheeling circuit (18) in which the free-wheeling current flows in the free-wheeling condition of the solenoid arrangement (14) prevailing during the clock pauses.
  2. Switching device according to claim 1, characterised in that the control device (26) is provided with a controlled switch (15), in particular designed as a semi-conductor switch, with a contact-break distance connected in series with the solenoid arrangement (14), so that the coil current (IS) can be switched on and off by means of the switch (15).
  3. Switching device according to claim 2, characterised in that the contact-break distance of the controlled switch (15) connects the free-wheeling circuit (18) and the measuring arrangement (16, 21).
  4. Switching device according to any of claims 1 to 3, characterised in that the free-wheeling circuit (18) comprises at least the solenoid arrangement (14) and a free-wheeling diode (17).
  5. Switching device according to claim 4, characterised in that a light-emitting diode (13) or other indicating elements are provided in the free-wheeling circuit (18).
  6. Switching device according to any of claims 1 to 5, characterised in that the measuring arrangement (16, 21) is provided with a measuring resistor (16) connectable in series with the solenoid arrangement (14), so that the coil current (IS) at least substantially flows through the measuring resistor (16) outside of the clock pauses.
  7. Switching device according to claim 6, characterised in that the measuring voltage (UM) released at the measuring resistor (16) is fed to an evaluation device via a measuring line (24), a switch (21) designed in particular as a semiconductor switch arrangement being located in the measuring line (24) to enable the evaluation device to be disconnected from the measuring voltage (UM).
  8. Switching device according to any of claims 1 to 7, characterised in that a rectifier arrangement (6) converts an input voltage (UO) to a DC voltage (UG) for the voltage supply of the solenoid arrangement (14).
  9. Switching device according to claim 8, characterised in that the rectifier arrangement (6) includes a rectifier bridge circuit (7).
  10. Switching device according to any of claims 1 to 9, characterised in that the voltage or power supply of the control device (26) is provided by a clocked voltage source (29) or power source fed via the supply voltage (UG) of the solenoid arrangement (14).
  11. Switching device according to any of claims 1 to 10, characterised in that the solenoid arrangement (14) consists of a single solenoid.
  12. Switching device according to any of claims 1 to 11, characterised in that the control device (26) is provided with data storage means for storing the latest measured value.
  13. Switching device according to claim 12, characterised in that the data storage means are designed as a sample-and-hold element.
EP98114690A 1997-09-05 1998-08-05 Current regulation circuit Revoked EP0901057B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29715925U 1997-09-05
DE29715925U DE29715925U1 (en) 1997-09-05 1997-09-05 Circuit device

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EP0901057A2 EP0901057A2 (en) 1999-03-10
EP0901057A3 EP0901057A3 (en) 1999-05-12
EP0901057B1 true EP0901057B1 (en) 2003-02-26

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EP (1) EP0901057B1 (en)
DE (2) DE29715925U1 (en)

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EP0901057A3 (en) 1999-05-12
EP0901057A2 (en) 1999-03-10
US6262874B1 (en) 2001-07-17
DE29715925U1 (en) 1997-10-23
DE59807292D1 (en) 2003-04-03

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