EP0351451A2 - Control circuitry for a pulsating current - Google Patents

Control circuitry for a pulsating current Download PDF

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Publication number
EP0351451A2
EP0351451A2 EP19880118381 EP88118381A EP0351451A2 EP 0351451 A2 EP0351451 A2 EP 0351451A2 EP 19880118381 EP19880118381 EP 19880118381 EP 88118381 A EP88118381 A EP 88118381A EP 0351451 A2 EP0351451 A2 EP 0351451A2
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EP
European Patent Office
Prior art keywords
current
voltage
circuit arrangement
output
pulse width
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Application number
EP19880118381
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German (de)
French (fr)
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EP0351451A3 (en
Inventor
Ralf Hartmann
Jürgen Reus
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Mannesmann VDO AG
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Mannesmann VDO AG
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Publication of EP0351451A2 publication Critical patent/EP0351451A2/en
Publication of EP0351451A3 publication Critical patent/EP0351451A3/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
    • H01H47/32—Energising current supplied by semiconductor device
    • H01H47/325—Energising current supplied by semiconductor device by switching regulator

Definitions

  • the invention relates to a circuit arrangement for regulating a pulsating current through an inductor, in particular the coil of an electro-magnetic valve, the inductor being connected in series with a semiconductor switch and in parallel with a free-wheeling diode, and furthermore a setpoint voltage can be fed to a controller whose output is connected to a control input of the semiconductor switch via a pulse width modulator.
  • the object of the present invention is to provide a circuit arrangement for regulating a pulsating current through an inductor, in which the coil current is inferred from the temporal part of the current flow, namely the time in which the current flows through the semiconductor switch, during the entire period can.
  • the circuit arrangement according to the invention is characterized in that the current which can be measured when the semiconductor switch is conducting is time-weighted and integrated.
  • a further development of the invention consists in that an actual value voltage can be derived with the aid of a current / voltage converter which is connected in series with the inductance and the semiconductor switch, a further switch which can be controlled by the pulse width modulator and an integrator.
  • a coil 1 is connected in series with a transistor 2 and a current / voltage converter 3 between the positive pole 4 of an operating voltage source (not shown in detail) and ground potential.
  • the coil 1 is part of an electromagnetic valve, in particular a valve for fuel injection in an internal combustion engine.
  • the coil 1 is connected to a freewheeling diode 5 in parallel.
  • a voltage Usoll is supplied as a setpoint to a controller 7 via an input 6.
  • the output of the controller 7 is connected to the input of a pulse width modulator 8, the output of which is connected to the control electrode of the transistor 2.
  • the pulse width modulator 8 controls a switch 9, which can be formed, for example, by a field effect transistor.
  • the current / voltage converter 3 consists of a resistor, across which a voltage proportional to the current drops. This is fed via switch 9 to an integrator 10, the output of which is connected to the inverting input of controller 7.
  • integrator 10 Various known circuits are suitable as integrator 10, for example a so-called Miller integrator.
  • the integration time constant is significantly longer than the period of the signal emitted by the pulse width modulator.
  • the controller 7 is shown for the sake of simplicity as a differential amplifier. However, various types of controllers such as PI controllers can be used within the scope of the invention.
  • FIG. 2a shows the course of the output voltage of the pulse width modulator, the time shift of the trailing edge dependent on the output voltage of the controller being indicated by a double arrow.
  • the transistor 2 is conductive during the period t0 to t1. During the remaining part of the period T, the transistor 2 is blocked.
  • the current is shown in FIG. 2b) through the coil 1 increases during the time t0 to t1 and then drops again until the transistor 2 is switched on again.
  • a current i1 flows through the transistor 2 during the period t0 to t1.
  • the current i2 flows through the free-wheeling diode 5 during the period t1 until the end of the period T.
  • 2c) shows the time profile of the current i1 through the transistor, which can be detected with the aid of the current / voltage converter 3.
  • the pulse width modulator is formed by a differential amplifier 12, one input 13 of which is a sawtooth-shaped signal and the other input of which is the output voltage of the regulator 7.
  • the output of the differential amplifier 12 is connected via a resistor 14 to + UB and via a further resistor 15 to the control electrode of the transistor 2.
  • the voltage UB is stabilized and is, for example, + 5V.
  • OTA Operational Transductance Amplifier
  • the OTA 17 is controlled via a transistor 26, the emitter of which is connected to the output of the differential amplifier 12 and the collector of which is connected to the control input 28 of the OTA 17 via a resistor 27.
  • the transistor 26 is in turn controlled in that the voltage at the connection point 29 between the coil 1 and the transistor 2 is supplied to the base of the transistor 26 via a voltage divider 30, 31.
  • a diode 32 is provided, which protects the base of transistor 26 from overvoltages.
  • the illustrated control of the OTA 17 has the effect that the OTA 17 only delivers an output current when the transistor 2 and thus also the transistor 26 are conductive.
  • the integrator is active during this time. During the remaining part of the period of the output signals of the pulse width modulator, the output of the OTA 17 is blocked, so that the output voltage of the integrator does not change.

Abstract

Bei einer Schaltungsanordnung zur Regelung eines pulsierenden Stroms durch eine Induktivität, insbesondere die Spule eines elektro-magnetischen Ventils, wobei die Induktivität in Reihe mit einem Halbleiterschalter und parallel zu einer Freilaufdiode geschaltet ist und wobei ferner eine Sollwertspannung einem Regler zuführbar ist, dessen Ausgang über einen Pulsbreitenmodulator mit einem Steuereingang des Halbleiterschalters verbunden ist, wird der bei leitendem Halbleiterschalter meßbare Strom zeitlich gewichtet und aufintegriert.In a circuit arrangement for regulating a pulsating current through an inductor, in particular the coil of an electro-magnetic valve, the inductor being connected in series with a semiconductor switch and in parallel with a freewheeling diode, and furthermore a setpoint voltage can be fed to a controller, the output of which is via a Pulse width modulator is connected to a control input of the semiconductor switch, the current which can be measured when the semiconductor switch is conductive is time-weighted and integrated.

Description

Die Erfindung betrifft eine Schaltungsanordnung zur Regelung eines pulsierenden Stroms durch eine Induk­tivität, insbesondere die Spule eines elektro-magne­tischen Ventils, wobei die Induktivität in Reihe mit einem Halbleiterschalter und parallel zur einer Frei­laufdiode geschaltet ist und wobei ferner eine Soll­wertspannung einem Regler zuführbar ist, dessen Aus­gang über einen Pulsbreitenmodulator mit einem Steu­ereingang des Halbleiterschalters verbunden ist.The invention relates to a circuit arrangement for regulating a pulsating current through an inductor, in particular the coil of an electro-magnetic valve, the inductor being connected in series with a semiconductor switch and in parallel with a free-wheeling diode, and furthermore a setpoint voltage can be fed to a controller whose output is connected to a control input of the semiconductor switch via a pulse width modulator.

Zur Regelung eines pulsierenden Stroms durch eine Induktivität ist eine möglichst genaue Erfassung des Stroms erforderlich. Bei den bekannten Schaltungen fließt in einem ersten Teil der Periodendauer ein Strom durch den Halbleiterschalter und die Induktivi­tät. In einem zweiten Teil der Periodendauer ist der Halbleiterschalter nichtleitend. Die in der Indukti­vität gespeicherte magnetische Energie bewirkt je­doch einen weiteren Stromfluß durch den sogenannten Freilaufkreis, der aus der Induktivität und der parallelgeschalteten Freilaufdiode besteht. Eine genaue Messung des gesamten Stroms kann an sich nur in den Zuleitungen der Induktivität erfolgen, was jedoch aus schaltungstechnischen Gründen oft nicht möglich ist.In order to regulate a pulsating current through an inductance, the most accurate detection of the current is necessary. In the known circuits, a current flows through the semiconductor switch and the inductor in a first part of the period. In a second part of the period, the semiconductor switch is not conductive. However, the magnetic energy stored in the inductor causes a further current flow through the so-called Free-wheeling circuit, which consists of the inductance and the parallel-connected free-wheeling diode. A precise measurement of the total current can only be done in the inductor feed lines, which is often not possible for circuitry reasons.

Aufgabe der vorliegenden Erfindung ist es, eine Schaltungsanordnung zur Regelung eines pulsierenden Stroms durch eine Induktivität anzugeben, bei wel­cher aus einem zeitlichen Teil des Stromflusses, näm­lich der Zeit, in der der Strom durch den Halbleiter­schalter fließt, auf den Spulenstrom während der gesamten Periodendauer geschlossen werden kann.The object of the present invention is to provide a circuit arrangement for regulating a pulsating current through an inductor, in which the coil current is inferred from the temporal part of the current flow, namely the time in which the current flows through the semiconductor switch, during the entire period can.

Die erfindungsgemäße Schaltungsanordnung ist dadurch gekennzeichnet, daß der bei leitendem Halbleiter­schalter meßbare Strom zeitlich gewichtet und aufin­tegriert wird.The circuit arrangement according to the invention is characterized in that the current which can be measured when the semiconductor switch is conducting is time-weighted and integrated.

Eine Weiterbildung der Erfindung besteht darin, daß eine Istwertspannung mit Hilfe eines Strom/Spannungs­wandlers, der in Reihe mit der Induktivität und dem Halbleiterschalter geschaltet ist, eines weiteren Schalters, der von dem Pulsbreitenmodulator steuer­bar ist, und eines Integrators ableitbar ist.A further development of the invention consists in that an actual value voltage can be derived with the aid of a current / voltage converter which is connected in series with the inductance and the semiconductor switch, a further switch which can be controlled by the pulse width modulator and an integrator.

Durch die in den weiteren Unteransprüchen aufgeführ­ten Maßnahmen sind weitere vorteilhafte Weiterbildun­gen und Verbesserungen der im Hauptanspruch angege­benen Erfindung möglich.The measures listed in the further subclaims further advantageous developments and improvements of the invention specified in the main claim are possible.

Die Erfindung läßt zahlreiche Ausführungsformen zu. Zwei davon sind schematisch in der Zeichnung anhand mehrerer Figuren dargestellt und nachfolgend be­schrieben. Es zeigt:

  • Fig. 1 ein Blockschaltbild einer ersten Ausführungs­form,
  • Fig. 2 Zeitdiagramme von bei der erfindungsgemäßen Schaltungsanordnung auftretenden Spannungen und Strömen und
  • Fig. 3 ein Schaltbild einer zweiten Ausführungsform.
The invention allows numerous embodiments. Two of these are shown schematically in the drawing using several figures and described below. It shows:
  • 1 is a block diagram of a first embodiment;
  • Fig. 2 timing diagrams of voltages and currents occurring in the circuit arrangement according to the invention and
  • Fig. 3 is a circuit diagram of a second embodiment.

Gleiche Teile sind in den Figuren mit gleichen Bezugszeichen versehen.Identical parts are provided with the same reference symbols in the figures.

Bei der Schaltungsanordnung nach Fig. 1 ist eine Spule 1 in Reihe mit einem Transistor 2 und einem Strom/Spannungswandler 3 zwischen den positiven Pol 4 einer im einzelnen nicht dargestellten Betriebs­spannungsquelle und Massepotential geschaltet. Die Spule 1 ist bei einem bevorzugten Anwendungsgebiet der erfindungsgemäßen Schaltung Teil eines elektro­magnetischen Ventils, insbesondere eines Ventils zur Kraftstoffeinspritzung bei einem Verbrennungsmotor. In an sich bekannter Weise ist der Spule 1 eine Frei­laufdiode 5 parallelgeschaltet.In the circuit arrangement according to FIG. 1, a coil 1 is connected in series with a transistor 2 and a current / voltage converter 3 between the positive pole 4 of an operating voltage source (not shown in detail) and ground potential. In a preferred application of the circuit according to the invention, the coil 1 is part of an electromagnetic valve, in particular a valve for fuel injection in an internal combustion engine. In a manner known per se, the coil 1 is connected to a freewheeling diode 5 in parallel.

Über einen Eingang 6 wird einem Regler 7 als Soll­wert eine Spannung Usoll zugeführt. Der Ausgang des Reglers 7 ist mit dem Eingang eines Pulsbreitenmodu­lators 8 verbunden, dessen Ausgang an die Steuerelek­trode des Transistors 2 angeschlossen ist. Außerdem steuert der Pulsbreitenmodulator 8 einen Schalter 9, der beispielsweise von einem Feldeffekttransistor gebildet werden kann.A voltage Usoll is supplied as a setpoint to a controller 7 via an input 6. The output of the controller 7 is connected to the input of a pulse width modulator 8, the output of which is connected to the control electrode of the transistor 2. In addition, the pulse width modulator 8 controls a switch 9, which can be formed, for example, by a field effect transistor.

Der Strom/Spannungswandler 3 besteht im einfachsten Fall aus einem Widerstand, an welchem eine dem Strom proportionale Spannung abfällt. Diese wird über den Schalter 9 einem Integrator 10 zugeführt, dessen Ausgang mit dem invertierenden Eingang des Reglers 7 verbunden ist. Als Integrator 10 eignen sich ver­schiedene bekannte Schaltungen, beispielsweise ein sogenannter Miller-Integrator. Die Integrationszeit­konstante ist wesentlich größer als die Periodendau­er des vom Pulsbreitenmodulator abgegebenen Signals. Der Regler 7 ist der Einfachheit halber als Diffe­renzverstärker dargestellt. Es sind jedoch verschie­dene Regler-Typen wie PI-Regler im Rahmen der Erfin­dung anwendbar.In the simplest case, the current / voltage converter 3 consists of a resistor, across which a voltage proportional to the current drops. This is fed via switch 9 to an integrator 10, the output of which is connected to the inverting input of controller 7. Various known circuits are suitable as integrator 10, for example a so-called Miller integrator. The integration time constant is significantly longer than the period of the signal emitted by the pulse width modulator. The controller 7 is shown for the sake of simplicity as a differential amplifier. However, various types of controllers such as PI controllers can be used within the scope of the invention.

Fig. 2a) zeigt den Verlauf der Ausgangsspannung des Pulsbreitenmodulators, wobei mit einem Doppelpfeil die von der Ausgangsspannung des Reglers abhängige zeitliche Verschiebung der Rückflanke angedeutet ist. Während des Zeitraums t0 bis t1 ist der Transi­stor 2 leitend. Während des restlichen Teils der Periodendauer T ist der Transistor 2 gesperrt. Ent­sprechend steigt der in Fig. 2b) dargestellte Strom is durch die Spule 1 während der Zeit t0 bis t1 an und fällt dann bis zum erneuten Einschalten des Transistors 2 wieder ab. Während des Zeitraums t0 bis t1 fließt also ein Strom i1 durch den Transistor 2. Der Strom i2 fließt während des Zeitraums t1 bis zum Ende der Periode T durch die Freilaufdiode 5. Fig. 2c) stellte den Zeitverlauf des Stroms i1 durch den Transistor dar, der mit Hilfe des Strom/Span­nungswandlers 3 erfaßbar ist.2a) shows the course of the output voltage of the pulse width modulator, the time shift of the trailing edge dependent on the output voltage of the controller being indicated by a double arrow. The transistor 2 is conductive during the period t0 to t1. During the remaining part of the period T, the transistor 2 is blocked. Correspondingly, the current is shown in FIG. 2b) through the coil 1 increases during the time t0 to t1 and then drops again until the transistor 2 is switched on again. A current i1 flows through the transistor 2 during the period t0 to t1. The current i2 flows through the free-wheeling diode 5 during the period t1 until the end of the period T. 2c) shows the time profile of the current i1 through the transistor, which can be detected with the aid of the current / voltage converter 3.

Die Schaltungsanordnung nach Fig. 3 umfaßt ebenfalls eine Spule 1 und eine Freilaufdiode 5, die an den positiven Pol 4 einer Betriebsspannungsquelle angeschlossen sind. In Reihe dazu ist ebenfalls ein Transistor 2 geschaltet, der über einen Strommeßwi­derstand 11 mit Massepotential verbunden ist. Ferner ist ebenfalls ein Regler 7 vorgesehen, dem über einen Eingang 6 die Spannung Usoll zugeführt wird. Der Pulsbreitenmodulator wird bei der Schaltungsan­ordnung nach Fig. 3 von einem Differenzverstärker 12 gebildet, dessen einem Eingang 13 ein sägezahnförmi­ges Signal und dessen anderem Eingang die Ausgangs­spannung des Reglers 7 zugeleitet wird. Der Ausgang des Differenzverstärkers 12 ist über einen Wider­stand 14 mit +UB und über einen weiteren Widerstand 15 mit der Steuerelektrode des Transistors 2 verbun­den. Wie bei derartigen Schaltungsanordnungen üb­lich, ist die Spannung UB stabilisiert und beträgt beispielsweise +5V.3 also comprises a coil 1 and a free-wheeling diode 5, which are connected to the positive pole 4 of an operating voltage source. A transistor 2 is also connected in series, which is connected to ground potential via a current measuring resistor 11. Furthermore, a regulator 7 is also provided, to which the voltage Usoll is supplied via an input 6. In the circuit arrangement according to FIG. 3, the pulse width modulator is formed by a differential amplifier 12, one input 13 of which is a sawtooth-shaped signal and the other input of which is the output voltage of the regulator 7. The output of the differential amplifier 12 is connected via a resistor 14 to + UB and via a further resistor 15 to the control electrode of the transistor 2. As is usual with such circuit arrangements, the voltage UB is stabilized and is, for example, + 5V.

Der dem Strom proportionale Spannungsabfall am Wider­stand 11 wird über einen Widerstand 16 dem nichtin­vertierenden Eingang eines schaltbaren Operationsver­stärker (OTA = Operational Transductance Amplifier) 17 zugeführt, der als Betriebsspannung einerseits über einen Anschluß 18 die positive Spannung UB und andererseits über einen Anschluß 19 eine mit einem Kondensator 20 gesiebte negative Hilfsspannung UH von beispielsweise -3V erhält. An den Ausgang des OTA 17 sind ein Integrationskondensator 21 und ein zusammen mit einem Widerstand 22 als Emitterfolge geschalteter Transistor 23 angeschlossen. Vom Emit­ter des Transistors 23 wird die Ausgangsspannung des Integrators über einen Spannungsteiler 24, 25 auf den invertierenden Eingang des OTA 17 rückgekoppelt. Außerdem gelangt die Ausgangsspannung des Integra­tors zum invertierenden Eingang des Reglers 7.The voltage drop across the resistor 11, which is proportional to the current, is fed via a resistor 16 to the non-inverting input of a switchable operational amplifier (OTA = Operational Transductance Amplifier) 17, which as the operating voltage has the positive voltage UB on the one hand via a connection 18 and a connection with a via a connection 19 Capacitor 20 receives negative auxiliary voltage UH of, for example, -3V. At the output of the OTA 17 there are an integration capacitor 21 and one together with a resistor 22 as an emitter sequence switched transistor 23 connected. The output voltage of the integrator is fed back from the emitter of transistor 23 via a voltage divider 24, 25 to the inverting input of OTA 17. In addition, the output voltage of the integrator reaches the inverting input of the regulator 7.

Die Steuerung des OTA 17 erfolgt über einen Transi­stor 26, dessen Emitter mit dem Ausgang des Diffe­renzverstärkers 12 und dessen Kollektor über einen Widerstand 27 mit dem Steuereingang 28 des OTA 17 verbunden ist. Die Steuerung des Transistors 26 wiederum erfolgt dadurch, daß die Spannung am Verbin­dungspunkt 29 zwischen der Spule 1 und dem Transi­stor 2 über einen Spannungsteiler 30, 31 der Basis des Transistors 26 zugeführt wird. Außerdem ist eine Diode 32 vorgesehen, welche die Basis des Transi­stors 26 vor Überspannungen schützt.The OTA 17 is controlled via a transistor 26, the emitter of which is connected to the output of the differential amplifier 12 and the collector of which is connected to the control input 28 of the OTA 17 via a resistor 27. The transistor 26 is in turn controlled in that the voltage at the connection point 29 between the coil 1 and the transistor 2 is supplied to the base of the transistor 26 via a voltage divider 30, 31. In addition, a diode 32 is provided, which protects the base of transistor 26 from overvoltages.

Die dargestellte Steuerung des OTA 17 bewirkt, daß der OTA 17 nur einen Ausgangsstrom liefert, wenn der Transistor 2 und damit auch der Transistor 26 lei­tend sind. Während dieser Zeit ist der Integrator wirksam. Während des übrigen Teils der Periodendauer der Ausgangssignale des Pulsbreitenmodulators ist der Ausgang des OTA 17 gesperrt, so daß sich die Ausgangsspannung des Integrators nicht ändert.The illustrated control of the OTA 17 has the effect that the OTA 17 only delivers an output current when the transistor 2 and thus also the transistor 26 are conductive. The integrator is active during this time. During the remaining part of the period of the output signals of the pulse width modulator, the output of the OTA 17 is blocked, so that the output voltage of the integrator does not change.

Claims (5)

1. Schaltungsanordnung zur Regelung eines pulsieren­den Stroms durch eine Induktivität, insbesondere die Spule eines elektro-magnetischen Ventils, wobei die Induktivität in Reihe mit einem Halbleiterschalter und parallel zu einer Freilaufdiode geschaltet ist und wobei ferner eine Sollwertspannung einem Regler zuführbar ist, dessen Ausgang über eine Pulsbreiten­modulator mit einem Steuereingang des Halbleiter­schalters verbunden ist, dadurch gekennzeichnet, daß der bei leitendem Halbleiterschlater meßbare Strom zeitlich gewichtet und aufintegriert wird.1. Circuit arrangement for regulating a pulsating current through an inductor, in particular the coil of an electro-magnetic valve, the inductor being connected in series with a semiconductor switch and in parallel with a free-wheeling diode, and furthermore a setpoint voltage can be supplied to a controller, the output of which is via a Pulse width modulator is connected to a control input of the semiconductor switch, characterized in that the current which can be measured when the semiconductor semiconductor is conducting is weighted and integrated over time. 2. Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, daß eine Istwertspannung mit Hilfe eines Strom/Spannungswandlers (3), der in Reihe mit der Induktivität (1) und dem Halbleiterschalter (2) geschaltet ist, eines weiteren Schalters (9), der von dem Pulsbreitenmodulator (8) steuerbar ist, und eines Integrators (10) ableitbar ist.2. Circuit arrangement according to claim 1, characterized in that an actual value voltage with the aid of a current / voltage converter (3) which is connected in series with the inductance (1) and the semiconductor switch (2), a further switch (9) which the pulse width modulator (8) can be controlled and an integrator (10) can be derived. 3. Schaltungsanordnung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß ein Ausgang des Strom/Spannungswandlers (3) über den weiteren Schalter (9) mit einem Eingang des Integrators (10) verbunden ist.3. Circuit arrangement according to one of claims 1 or 2, characterized in that an output of the current / voltage converter (3) via the further switch (9) is connected to an input of the integrator (10). 4. Schaltungsanordnung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß der weitere Schalter und der Integrator von einem schaltbaren Operationsverstärker (17) gebildet sind, dessen Aus gang über einen Kondensator (21) mit festem Potenti­al und über einen als Impedanzwandler geschalteten Transistor (23) und einen Spannungsteiler (24, 25) mit dem invertierenden Eingang verbunden ist und dessen nichtinvertierendem Eingang die Ausgangsspan­nung des Strom/Spannungswandlers (11) zuführbar ist.4. Circuit arrangement according to one of claims 1 or 2, characterized in that the further switch and the integrator are formed by a switchable operational amplifier (17) whose output via a capacitor (21) with a fixed potential and a transistor connected as an impedance converter (23) and a voltage divider (24, 25) is connected to the inverting input and the non-inverting input of the output voltage of the current / voltage converter (11) can be supplied. 5. Schaltungsanordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Zeitkon­stante der Integrationsschaltung wesentlich größer als die Periodendauer des von dem Pulsbreitenmodula­tor abgegebenen signals ist.5. Circuit arrangement according to one of the preceding claims, characterized in that the time constant of the integration circuit is substantially greater than the period of the signal emitted by the pulse width modulator.
EP19880118381 1988-07-20 1988-11-04 Control circuitry for a pulsating current Withdrawn EP0351451A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883824526 DE3824526A1 (en) 1988-07-20 1988-07-20 CIRCUIT ARRANGEMENT FOR CONTROLLING A PULSATING CURRENT
DE3824526 1988-07-20

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EP0351451A2 true EP0351451A2 (en) 1990-01-24
EP0351451A3 EP0351451A3 (en) 1990-11-22

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US4978865A (en) 1990-12-18
EP0351451A3 (en) 1990-11-22
DE3824526A1 (en) 1990-01-25

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