EP0801797A1 - Arrangement for controlling a consumer - Google Patents

Arrangement for controlling a consumer

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Publication number
EP0801797A1
EP0801797A1 EP95915776A EP95915776A EP0801797A1 EP 0801797 A1 EP0801797 A1 EP 0801797A1 EP 95915776 A EP95915776 A EP 95915776A EP 95915776 A EP95915776 A EP 95915776A EP 0801797 A1 EP0801797 A1 EP 0801797A1
Authority
EP
European Patent Office
Prior art keywords
consumer
control means
current
switching means
control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP95915776A
Other languages
German (de)
French (fr)
Inventor
Viktor Kahr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0801797A1 publication Critical patent/EP0801797A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F02D2041/001—Controlling intake air for engines with variable valve actuation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/2017—Output circuits, e.g. for controlling currents in command coils using means for creating a boost current or using reference switching
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/2068—Output circuits, e.g. for controlling currents in command coils characterised by the circuit design or special circuit elements
    • F02D2041/2075—Type of transistors or particular use thereof

Definitions

  • the invention relates to a device for controlling a consumer according to the preamble of claim 1.
  • Such a device is known for example from DE-OS 38 05 031.
  • a device for controlling a consumer in particular an electromagnetic consumer, is described.
  • the current flowing through the consumer is measured and adjusted to a setpoint.
  • av "in series is then driven to the consumer lying switch from the current flowing through the load current.
  • Power transistors are preferably used as switches. If the current is set by means of an analog control, there is a very high power loss in the power transistor.
  • the power consumption of transistors essentially depends on the maximum permissible temperature and the heat connection to the environment. Exceeds that Power loss the maximum power consumption of the transistor, a transistor with a higher maximum power loss is usually used and / or the power loss is divided over several transistors. These measures are often too expensive or are not sufficient.
  • the invention has for its object to show a device for controlling a consumer of the type mentioned, how the power dissipation of the power transistor can be reduced.
  • Figure 1 shows schematically the most important elements of the device according to the invention.
  • Figure 2 shows various signals occurring in the device. Description of the exemplary embodiment
  • the consumer is the coil of a solenoid valve, which influences the fuel metering in an internal combustion engine.
  • a solenoid valve By triggering this solenoid valve, the start of injection, the end of injection and thus the amount of fuel injected can be controlled.
  • the solenoid valve opens and / or closes at a defined point in time.
  • the solenoid valve reaches its new end position as quickly as possible after the control signal is output.
  • the electromagnetic consumer is designated with 100. This is connected to its one terminal with battery voltage. With its other connection it is connected to a control means 110.
  • the control means 110 is preferably a transistor, in particular a field effect transistor.
  • the second connection of the consumer is connected to the drain connection of the field effect transistor 110.
  • the source connection of the transistor 110 is connected to a current measuring means 120 for detecting the current flowing through the consumer.
  • the second terminal of the current measuring means 120 is connected to ground.
  • connection point between the second connection of the consumer 100 and the control means 110 is connected to the first connection of a resistor 150.
  • the second connection of the resistor 150 is connected to a switching means 140.
  • a transistor, in particular a field effect transistor, is preferably used as switching means 140.
  • the second terminal of resistor 150 is connected to the drain terminal of transistor 150.
  • the source of transistor 140 is in contact with the connection point between control means 110 and current measuring means 120.
  • the gate connection of transistor 140 and the gate connection of transistor 110 are acted upon by a control unit 130 with Ar control signals.
  • the current measuring means 120 is preferably implemented as a resistor.
  • the two connections of the resistor 120 are scanned by the control unit 130.
  • the two voltage values are fed to a current detector 132, which provide an actual current value I s based on the voltage drop across resistor 120.
  • This actual value Ii s t 133 is supplied to a controller as an actual value.
  • the second connection of the controller 133 is connected to a setpoint input 131, which applies a setpoint I so n to the second input.
  • the output of the controller 133 applies a corresponding signal to the gate of the transistor 110.
  • control device 130 evaluates various output signals from sensors 135. The mode of operation of this device is described below with reference to FIG. 2.
  • the control signal for the control means 110 in the second line the control signal for the switching means 140 and in the third line the current through the switching means 140 as a broken line and the total current flowing through the solenoid valve 100 as solid line.
  • control means 140 and control means 110 are fully switched through.
  • the current flowing through the solenoid valve increases to the desired value for the attracting current I so ll ⁇ to - the time T2 of the pull-in current is achieved.
  • the resistance of the control means 110 is equal to or less than the resistance of the switching means 140 and the resistor 150. In this phase, most of the current flows through the control means 110 and only flows in small part by the switching means 140.
  • the activation of the control means 110 is withdrawn from the time T2. This means that the resistance of the control means 110 increases. As a result, the current flowing through the switching means 140 increases.
  • the setpoint for the current is lowered to its holding current level I so ll 2 . This means that the control for the control means 110 is further reduced. The resistance of the control means 110 and thus the current through the switching means 140 thereby increase.
  • the activation of the solenoid valve ends at time T4.
  • the resistor 150 is dimensioned such that the largest current component flows through the switching means 140 and the resistor 150 from the time T3. Only a small amount of current flows through the control means 110. This is achieved in that the branch consisting of the resistance means 150 and the switching means 140 has a smaller resistance than the control means 110 in the period between T3 and T4.
  • the branch consisting of the resistance means 150 and the switching means 140 also absorbs most of the power loss.
  • the control means is regulated back so far that the current flowing through the control means 110 now corresponds to the difference between the setpoint I so ll u 111 ⁇ the current flowing through the switching means 140.
  • the switching means 140 is fully switched through and operates as a switch. Most of the current flows through the switching means 140.
  • the branch consisting of resistor 150 and switching means 140 also absorbs most of the power loss.
  • the control means 110 works as an analog current regulator. The control means 110 receives the differential current between the setpoint and the current flowing through the switching means 140.
  • resistor 150 The major part of the energy loss is implemented in resistor 150 and not in a transistor. Resistors can be essential compared to transistors at the same cost higher temperatures can be designed. A good heat connection to the environment or to heat sinks can be achieved with little effort. The control of the output stages is simple in comparison to the circuitry required for the distribution of the power loss over several power transistors.
  • the power resistor 150 need not have a narrow tolerance, since the control means 110 carries out a current regulation. Furthermore, the resistor 150 can be attached externally by the control device, for example in the vicinity of the consumer 100.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Control Of Electrical Variables (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
  • Electronic Switches (AREA)

Abstract

The invention concerns an arrangement for controlling a consumer (100), in particular an electromagnetic consumer. The arrangement comprises means (120) for detecting the current flowing through the consumer and a control means (110) which is connected in series with the consumer and which can be controlled independently of the current flowing through said consumer. Furthermore, a switching means (140) is arranged in parallel with the control means (110).

Description

Einrichtung zur Ansteuerunσ eines VerbrauchersDevice for controlling a consumer
Stand der TechnikState of the art
Die Erfindung betrifft eine Einrichtung zur Ansteuerung eines Verbrauchers gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a device for controlling a consumer according to the preamble of claim 1.
Eine solche Einrichtung ist beispielsweise aus der DE-OS 38 05 031 bekannt. Dort wird eine Einrichtung zur Ansteuerung eines Verbrauchers, insbesondere eines elektromagnetischen Verbrauchers, beschrieben. Mittels einer Iststrommessung wird, der durch den Verbraucher fließende Strom, gemessen und auf einen Sollwert eingeregelt. Abhängig von dem durch den Verbraucher fließenden Strom wird dann einv»in Reihe zum Verbraucher liegender Schalter angesteuert.Such a device is known for example from DE-OS 38 05 031. There, a device for controlling a consumer, in particular an electromagnetic consumer, is described. By means of an actual current measurement, the current flowing through the consumer is measured and adjusted to a setpoint. Depending av "in series is then driven to the consumer lying switch from the current flowing through the load current.
Als Schalter werden vorzugsweise Leistungstransistoren verwendet. Wird der Strom mittels einer Analogregelung eingestellt, so entsteht im Leistungstransistor eine sehr hohe Verlustleistung. Die Leistungsaufnahme von Transistoren ist im wesentlichen von der maximal zulässigen Temperatur und von der Wärmeanbindung an die Umgebung abhängig. Übersteigt die Verlustleistung die maximale Leistungsaufnahme des Transistors, so wird üblicherweise ein Transistor mit höherer maximaler Verlustleistung eingesetzt und/oder die Verlustleistung auf mehrere Transistoren aufgeteilt. Diese Maßnahmen sind oft zu teuer oder reichen nicht aus.Power transistors are preferably used as switches. If the current is set by means of an analog control, there is a very high power loss in the power transistor. The power consumption of transistors essentially depends on the maximum permissible temperature and the heat connection to the environment. Exceeds that Power loss the maximum power consumption of the transistor, a transistor with a higher maximum power loss is usually used and / or the power loss is divided over several transistors. These measures are often too expensive or are not sufficient.
Aufgabe der ErfindungObject of the invention
Der Erfindung liegt die Aufgabe zugrunde, bei einer Einrichtung zur Ansteuerung eines Verbrauchers der eingangs genannten Art eine Möglichkeit aufzuzeigen, wie die Verlustleistung des Leistungstransistors vermindert werden kann.The invention has for its object to show a device for controlling a consumer of the type mentioned, how the power dissipation of the power transistor can be reduced.
Die Aufgabe wird durch die im Anspruch 1 gekennzeichneten Merkmale gelöst.The object is achieved by the features characterized in claim 1.
Vorteile der ErfindungAdvantages of the invention
Bei der erfindungsgemäßen Einrichtung können Leistungstransistoren mit wesentlich geringerer maximaler Leistungsaufnahme und damit billigere Transistoren verwendet werden.In the device according to the invention, power transistors with a significantly lower maximum power consumption and thus cheaper transistors can be used.
Zeichnungdrawing
Die Figur 1 zeigt schematisch die wesentlichsten Elemente der erfindungsgemäßen Einrichtung. Die Figur 2 zeigt verschiedene in der Einrichtung auftretende Signale. Beschreibung des AusfuhrungsbeispielsFigure 1 shows schematically the most important elements of the device according to the invention. Figure 2 shows various signals occurring in the device. Description of the exemplary embodiment
Bei dem Ausfuhrungsbeispiel handelt es sich bei dem Verbraucher um die Spule eines Magnetventils, das die Kraftstoffzumessung in eine Brennkraftmaschine beeinflußt. Durch Ansteuerung dieses Magnetventils kann der Einspritzbeginn, das Einspritzende und damit auch die eingespritzte Kraftstoffmenge gesteuert werden. Hierzu ist es erforderlich, daß das Magnetventil zu einem definierten Zeitpunkt öffnet und/oder schließt. Desweiteren ist erforderlich, daß das Magnetventil nach Ausgabe des Ansteuersignals möglichst schnell seine neue Endlage erreicht.In the exemplary embodiment, the consumer is the coil of a solenoid valve, which influences the fuel metering in an internal combustion engine. By triggering this solenoid valve, the start of injection, the end of injection and thus the amount of fuel injected can be controlled. For this it is necessary that the solenoid valve opens and / or closes at a defined point in time. Furthermore, it is necessary that the solenoid valve reaches its new end position as quickly as possible after the control signal is output.
In Figur 1 sind die wesentlichsten Elemente der erfindungsgemäßen Einrichtung schematisch dargestellt. Mit 100 ist der elektromagnetische Verbraucher bezeichnet. Dieser ist mit seinem einen Anschluß mit Batteriespannung verbunden. Mit seinen anderen Anschluß steht er mit einem Steuermittel 110 in Verbindung.The most important elements of the device according to the invention are shown schematically in FIG. The electromagnetic consumer is designated with 100. This is connected to its one terminal with battery voltage. With its other connection it is connected to a control means 110.
Bei dem Steuermittel 110 handelt es sich vorzugsweise um einen Transistor, insbesondere um einen Feldeffekttransistor. In diesem Fall steht der zweite Anschluß des Verbrauchers mit dem Drain-Anschluß des Feldeffekttransistors 110 in Verbindung. Der Source-Anschluß des Transistors 110 steht mit einem Strommeßmittel 120 zur Erfassung des durch den Verbraucher fließenden Stroms in Verbindung. Der zweite Anschluß des Strommeßmittels 120 steht mit Masse in Verbindung.The control means 110 is preferably a transistor, in particular a field effect transistor. In this case, the second connection of the consumer is connected to the drain connection of the field effect transistor 110. The source connection of the transistor 110 is connected to a current measuring means 120 for detecting the current flowing through the consumer. The second terminal of the current measuring means 120 is connected to ground.
Die Anordnung dieser drei Elemente ist nur beispielhaft dargestellt. So können diese Elemente auch in anderer Reihenfolge angeordnet sein. So können beispielsweise Masse und Batterieanschlüsse vertauscht sein. Der Verbindungspunkt zwischen dem zweiten Anschluß des Verbrauchers 100 und dem Steuermittel 110 steht mit dem ersten Anschluß eines Widerstands 150 in Verbindung. Der zweite Anschluß des Widerstands 150 ist mit einem Schaltmittel 140 verbunden. Als Schaltmittel 140 wird vorzugsweise ein Transistor, insbesondere ein Feldeffekttransistor eingesetzt. In diesem Fall steht der zweite Anschluß des Widerstands 150 mit dem Drain-Anschluß des Transistors 150 in Verbindung. Der Source-Anschluß des Transistors 140 steht in Kontakt mit dem Verbindungspunkt zwischen dem Steuermittel 110 und dem Strommeßmittel 120.The arrangement of these three elements is only shown as an example. So these elements can also be arranged in a different order. For example, ground and battery connections can be interchanged. The connection point between the second connection of the consumer 100 and the control means 110 is connected to the first connection of a resistor 150. The second connection of the resistor 150 is connected to a switching means 140. A transistor, in particular a field effect transistor, is preferably used as switching means 140. In this case, the second terminal of resistor 150 is connected to the drain terminal of transistor 150. The source of transistor 140 is in contact with the connection point between control means 110 and current measuring means 120.
Der Gate-Anschluß des Transistors 140 und der Gate-Anschluß des Transistors 110 werden von einer Steuereinheit 130 mit Ar-Steuersignalen beaufschlagt.The gate connection of transistor 140 and the gate connection of transistor 110 are acted upon by a control unit 130 with Ar control signals.
Das Strommeßmittel 120 ist vorzugsweise als Widerstand realisiert. Die beiden Anschlüsse des Widerstands 120 werden von der Steuereinheit 130 abgetastet. Die beiden Spannungswerte werden einer Stromerfassung 132 zugeführt, die ausgehend von dem Spannungsabfall am Widerstand 120 einen Stromistwert I s bereitstellen. Dieser Istwert Iist wird einem Regler 133 als Istwert zugeführt. Der zweite Anschluß des Reglers 133 steht mit einer Sollwertvorgabe 131 in Verbindung, die den zweiten Eingang mit einem Sollwert Ison beaufschlagt. Der Ausgang des Reglers 133 beaufschlagt das Gate des Transistors 110 mit einem entsprechenden Signal.The current measuring means 120 is preferably implemented as a resistor. The two connections of the resistor 120 are scanned by the control unit 130. The two voltage values are fed to a current detector 132, which provide an actual current value I s based on the voltage drop across resistor 120. This actual value Ii s t 133 is supplied to a controller as an actual value. The second connection of the controller 133 is connected to a setpoint input 131, which applies a setpoint I so n to the second input. The output of the controller 133 applies a corresponding signal to the gate of the transistor 110.
Zur Bildung der Ansteuersignale wertet die Steuereinrichtung 130 verschiedene AusgangsSignale von Sensoren 135 aus. Die Funktionsweise dieser Einrichtung wird im folgenden anhand der Figur 2 beschrieben. In der ersten Zeile der Figur ist das Ansteuersignal für das Steuermittel 110, in der zweiten Zeile das Ansteuersignal für das Schaltmittel 140 und in der dritten Zeile der Strom durch das Schaltmittel 140 als gestrichelte Linie und der Gesamtstrom, der durch das Magnetventil 100 fließt, als durchgezogene Linie aufgetragen.To form the control signals, the control device 130 evaluates various output signals from sensors 135. The mode of operation of this device is described below with reference to FIG. 2. In the first line of the figure the control signal for the control means 110, in the second line the control signal for the switching means 140 and in the third line the current through the switching means 140 as a broken line and the total current flowing through the solenoid valve 100 as solid line.
Bei Ansteuerbeginn zum Zeitpunkt Tl, wird der Schaltmittel 140 und das Steuermittel 110 voll durchgeschaltet. Der Strom, der durch das Magnetventil fließt, steigt bis zu dem Sollwert für den Anzugstrom Isollι an- Zum Zeitpunkt T2 wird der Anzugstrom erreicht. Solange das Steuermittel 110 zwischen den Zeitpunkten Tl und T2 voll durchgeschaltet ist, ist der Widerstand des Steuermittels 110 gleich oder kleiner als der Widerstand des Schaltmittels 140 und des Widerstands 150. In dieser Phase fließt der größte Teil des Stroms durch das Steuermittel 110 und nur ein geringer Teil durch das Schaltmittel 140.When control begins at time T1, switching means 140 and control means 110 are fully switched through. The current flowing through the solenoid valve, increases to the desired value for the attracting current I so llι to - the time T2 of the pull-in current is achieved. As long as the control means 110 is fully switched between the times T1 and T2, the resistance of the control means 110 is equal to or less than the resistance of the switching means 140 and the resistor 150. In this phase, most of the current flows through the control means 110 and only flows in small part by the switching means 140.
Ab dem Zeitpunkt T2 wird die Ansteuerung des Steuermittels 110 zurückgenommen. Dies bedeutet der Widerstand des Steuermittels 110 vergrößert sich. Hieraus resultiert, daß der Strom, der durch das Schaltmittel 140 fließt, ansteigt.The activation of the control means 110 is withdrawn from the time T2. This means that the resistance of the control means 110 increases. As a result, the current flowing through the switching means 140 increases.
Zum Zeitpunkt T3 wird der Sollwert für den Strom auf sein Haltestromniveau Isoll2 abgesenkt. Dies bedeutet, die Ansteuerung für das Steuermittel 110 wird weiter reduziert. Der Widerstand des Steuermittels 110 und damit der Strom durch das Schaltmittel 140 steigen dadurch an.At time T3, the setpoint for the current is lowered to its holding current level I so ll 2 . This means that the control for the control means 110 is further reduced. The resistance of the control means 110 and thus the current through the switching means 140 thereby increase.
Zum Zeitpunkt T4 endet die Ansteuerung des Magnetventils. Dies bedeutet zum Beispiel, das Schaltmittel 140 wird geöffnet und das Steuermittel 110 wird so angesteuert, daß der durch das Schaltmittel 110 fließende Strom langsam auf Null zurück geht. Der Strom durch das Steuermittel 140 fällt sofort ab.The activation of the solenoid valve ends at time T4. This means, for example, the switching means 140 is opened and the control means 110 is controlled so that the current flowing through the switching means 110 slowly returns to zero. The current through the control means 140 drops immediately.
Der Widerstand 150 ist so dimensioniert, daß ab dem Zeitpunkt T3 der größte Stromanteil durch das Schaltmittel 140 und den Widerstand 150 fließt. Lediglich ein kleiner Stromanteil fließt über das Steuermittel 110. Dies wird dadurch erreicht, daß im Zeitraum zwischen T3 und T4 der Zweig bestehend aus dem Widerstandsmittel 150 und dem Schaltmittel 140 einen kleineren Widerstand aufweist als das Steuermittel 110.The resistor 150 is dimensioned such that the largest current component flows through the switching means 140 and the resistor 150 from the time T3. Only a small amount of current flows through the control means 110. This is achieved in that the branch consisting of the resistance means 150 and the switching means 140 has a smaller resistance than the control means 110 in the period between T3 and T4.
Dies bedeutet, daß der Zweig bestehend aus dem Widerstandsmittel 150 und dem Schaltmittel 140 auch den größten Teil der Verlustleistung aufnimmt. Nach Erreichen des Sollwerts für den Anzugsstrom wird das Steuermittel soweit zurückgeregelt, daß der Strom, der durch das Steuermittel 110 fließt, nunmehr dem Differenzbetrag zwischen dem Sollwert Isoll u111^ dem durch das Schaltmittel 140 fließenden Strom entspricht.This means that the branch consisting of the resistance means 150 and the switching means 140 also absorbs most of the power loss. After reaching the setpoint for the starting current, the control means is regulated back so far that the current flowing through the control means 110 now corresponds to the difference between the setpoint I so ll u 111 ^ the current flowing through the switching means 140.
Das Schaltmittel 140 wird jeweils voll durchgeschaltet und arbeitet als Schalter. Durch das Schaltmittel 140 fließt der größte Teil des Stroms. Der Zweig bestehend aus Widerstand 150 und Schaltmittel 140 nimmt auch den größten Teil der Verlustleistung auf. Das Steuermittel 110 arbeitet als Analogstromregler. Das Steuermittel 110 nimmt den Differenzstrom zwischen dem Sollwert und dem Strom, der durch das Schaltmittel 140 fließt, auf.The switching means 140 is fully switched through and operates as a switch. Most of the current flows through the switching means 140. The branch consisting of resistor 150 and switching means 140 also absorbs most of the power loss. The control means 110 works as an analog current regulator. The control means 110 receives the differential current between the setpoint and the current flowing through the switching means 140.
Der wesentliche Teil der Verlustenergie wird im Widerstand 150 umgesetzt und nicht in einem Transistor. Widerstände können im Vergleich zu Transistoren bei gleichen Kosten für wesentlich höhere Temperaturen ausgelegt werden. Mit geringem Aufwand kann eine gute Wärmeanbindung zur Umgebung, bzw. zu Kühlkörpern erzielt werden. Die Ansteuerung der Endstufen ist einfach im Vergleich zu dem erforderlichen Schaltungsaufwand bei der Aufteilung der Verlustleistung auf mehrere Leistungstransistoren.The major part of the energy loss is implemented in resistor 150 and not in a transistor. Resistors can be essential compared to transistors at the same cost higher temperatures can be designed. A good heat connection to the environment or to heat sinks can be achieved with little effort. The control of the output stages is simple in comparison to the circuitry required for the distribution of the power loss over several power transistors.
Der Leistungswiderstand 150 braucht keine enge Toleranz aufweisen, da das Steuermittel 110 eine Stromregelung durchführt. Desweiteren kann der Widerstand 150 extern vom Steuergerät, beispielsweise in der Nähe des Verbrauchers 100 angebracht werden. The power resistor 150 need not have a narrow tolerance, since the control means 110 carries out a current regulation. Furthermore, the resistor 150 can be attached externally by the control device, for example in the vicinity of the consumer 100.

Claims

Ansprüche Expectations
1. Einrichtung zur Ansteuerung eines Verbrauchers (100) insbesondere eines elektromagnetischen Verbrauchers, mit Mitteln (120) zur Erfassung des durch den Verbraucher fließenden Stroms, mit einem zum Verbraucher in Reihe geschalteten Steuermittel (110) , das abhängig von dem durch den Verbraucher fließenden Strom ansteuerbar ist, dadurch gekennzeichnet, daß parallel zum Steuermittel (110) ein Schaltmittel (140) angeordnet ist.1. Device for controlling a consumer (100), in particular an electromagnetic consumer, with means (120) for detecting the current flowing through the consumer, with a control means (110) connected in series to the consumer, which is dependent on the current flowing through the consumer can be controlled, characterized in that a switching means (140) is arranged parallel to the control means (110).
2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß ein Widerstandsmittel (150) in Reihe zu dem Schaltmittel (140) angeordnet ist.2. Device according to claim 1, characterized in that a resistance means (150) is arranged in series with the switching means (140).
3. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Steuermittel (110) als Analogstromregler arbeitet.3. Device according to one of the preceding claims, characterized in that the control means (110) operates as an analog current regulator.
4. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, daß das Steuermittel (110) abhängig von dem Vergleich zwischen dem durch den Verbraucher (100) fließenden Strom und einem Sollstrom ansteuerbar ist. 4. Device according to claim 3, characterized in that the control means (110) depending on the comparison between the current flowing through the consumer (100) and a target current can be controlled.
5. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Schaltmittel (140) als Schalter arbeitet.5. Device according to one of the preceding claims, characterized in that the switching means (140) works as a switch.
6. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß bei Ansteuerbeginn das Schaltmittel (140) und das Steuermittel (110) voll durchgesteuert werden.6. Device according to one of the preceding claims, characterized in that the switching means (140) and the control means (110) are fully controlled at the start of control.
7. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Widerstandsmittel (150) so dimensioniert ist, daß der Zweig bestehend aus Widerstandsmittel (150) und Schaltmittel (140) einen kleineren Widerstand aufweist als das Steuermittel (110) . 7. Device according to one of the preceding claims, characterized in that the resistance means (150) is dimensioned so that the branch consisting of resistance means (150) and switching means (140) has a smaller resistance than the control means (110).
EP95915776A 1994-04-27 1995-04-11 Arrangement for controlling a consumer Withdrawn EP0801797A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4414609A DE4414609B4 (en) 1994-04-27 1994-04-27 Device for controlling a consumer
DE4414609 1994-04-27
PCT/DE1995/000501 WO1995029492A1 (en) 1994-04-27 1995-04-11 Arrangement for controlling a consumer

Publications (1)

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EP0801797A1 true EP0801797A1 (en) 1997-10-22

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EP95915776A Withdrawn EP0801797A1 (en) 1994-04-27 1995-04-11 Arrangement for controlling a consumer

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US (1) US5731946A (en)
EP (1) EP0801797A1 (en)
JP (1) JP2002502546A (en)
KR (1) KR960702670A (en)
DE (1) DE4414609B4 (en)
WO (1) WO1995029492A1 (en)

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Also Published As

Publication number Publication date
WO1995029492A1 (en) 1995-11-02
KR960702670A (en) 1996-04-27
DE4414609B4 (en) 2005-12-22
DE4414609A1 (en) 1995-11-16
JP2002502546A (en) 2002-01-22
US5731946A (en) 1998-03-24

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