EP2908036B1 - Switching assembly for adjusting a valve - Google Patents

Switching assembly for adjusting a valve Download PDF

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Publication number
EP2908036B1
EP2908036B1 EP14155493.1A EP14155493A EP2908036B1 EP 2908036 B1 EP2908036 B1 EP 2908036B1 EP 14155493 A EP14155493 A EP 14155493A EP 2908036 B1 EP2908036 B1 EP 2908036B1
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EP
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Prior art keywords
valve
triac
arrangement
heating element
mosfet
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EP14155493.1A
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German (de)
French (fr)
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EP2908036A1 (en
Inventor
Marc Neujahr
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Moehlenhoff GmbH
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Moehlenhoff GmbH
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Priority to EP14155493.1A priority Critical patent/EP2908036B1/en
Priority to DK14155493.1T priority patent/DK2908036T3/en
Publication of EP2908036A1 publication Critical patent/EP2908036A1/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/023—Industrial applications

Definitions

  • the invention relates to an arrangement with a valve and a circuit arrangement for adjusting the same according to claim 1.
  • Such a circuit arrangement can be used for example for systems of heating and ventilation technology. It can basically be used wherever an adjustment movement is to be performed by a valve. It can be moved, for example, flaps or light pipe cross sections are changed. Without limiting the general applicability of the circuit arrangement according to the invention, the further embodiments relate to the use of the same for setting valves of a hot water heating system.
  • Such heating systems can be installed in different buildings, such as office buildings, hospitals, hotels, apartment buildings or villas.
  • the valves of the heating systems can be installed at different places in pipelines or connected to them. Such locations are, for example, heating circuit manifolds, in which a larger number of valves is arranged close to each other.
  • the invention has for its object to make the above-described circuit arrangement so that the heating element can be powered regardless of the type of electrical voltage source used.
  • TRIAC and MOSFET are well-known electronic components.
  • a TRIAC has a control electrode - hereafter referred to as "gate” - and two main electrodes. It is in principle an anti-parallel connection of two thyristors, so that it can switch AC. For this it must be ignited after each zero crossing of the alternating current.
  • a MOSFET is a field effect transistor with the three electrodes "gate”, “drain” and “source”. On the principle known effect of these two components will not be discussed in more detail below. From the EP 0 627 808 A2 It is also known to arrange a TRIAC in series with two series MOSFETs. This document relates to a control system for an electric converter, by which the frequency of current supplied by synchronous electric motors can be changed.
  • a valve can be adjusted by heating the heating element both with alternating current and with direct current, without having to be changed at its structure something.
  • the TRIAC is switched current-passing through the processor at a sufficiently high frequency, and at the same time, the MOSFET in the positive half cycle of the alternating current is also switched through by the processor. In the negative half-wave of the alternating current, the diode of the MOSFET provides the necessary current flow.
  • DC the required current flow through the MOSFET.
  • the TRIAC is ignited by the processor each time the DC power source is turned on.
  • the valve is in this circuit always just as long for a certain fraction of a unit time, for example, a second driven, that the plunger without noticeable control oscillation between an upper position and a lower position.
  • the valve which is set with the circuit arrangement of this arrangement can have both the state "normally open” and the state "normally closed".
  • "Normally open” means that the valve is open when the heating element of the associated control element is not heated, that is not supplied with power. This condition is for example in the DE 10 2009 040 098 A1 described.
  • the state "normally closed” corresponds to the opposite state, as it is for example in the DE 31 40 472 C2 is described. When switching on the power source belonging to the circuit, the respective heating element is heated, so that the valve is transferred to the other state.
  • the temperature-dependent actuator can be an expansion element according to the DE 31 40 472 C2 or an element of a shape-memory alloy, as described for example in the EP 1 926 928 B1 is described.
  • arrangement 1 is equipped with a designed as an expansion body 2 temperature-dependent actuator.
  • the arrangement 2 can be placed on a valve 3 indicated only schematically.
  • the valve 3 has a plunger 4, which is under the action of one of the sake of simplicity not shown valve spring and is adjustable in the direction of the double arrow 5 between an open position and a closed position.
  • the nozzle 6 of the valve 3 is equipped, for example, with a thread on which a holder 7 can be screwed, which serves to fix a housing 8 of the arrangement 1 on the valve 3.
  • the arrangement 1 itself consists - without housing 8 and holder 7 - from the temperature-dependent expansion body 2, an approximately cup-like actuator 9 and a compression spring 10.
  • the expansion element 2 has a working piston 11.
  • electrical resistance is attached at the expansion element 2 also serving as a heating element 12 , which is connectable via an electrical line 13 and an electrical contact 14 to a voltage source.
  • a PTC resistor is used with advantage.
  • the heating element 12 can be supplied with both AC and DC.
  • the heating element 12 is arranged in a circuit which runs between a voltage source Ub and a reference potential M, which is advantageously ground or ground potential.
  • a TRIAC 16 and a MOSFET 17 are connected in series, in a preferred embodiment between the heating element 12 and the reference potential M.
  • the TRIAC 16 is connected between the heating element 12 and the MOSFET 17.
  • the gates of TRIAC 16 and MOSFET 17 are connected to a processor 18 powered by a voltage source.
  • the electrodes 19 (drain) and 20 (source) of the MOSFET 17 are interconnected by a diode 21 which is current-permeable in the direction of the TRIAC 16.
  • the circuit also includes a not-shown, basically known sensor which detects the position of the plunger 4 of the valve and supplies corresponding signals to the processor 18.
  • the voltage source for the processor 18 may be a separate voltage source. However, the voltage source Ub can also be used.
  • the series connection of TRIAC 16 and MOSFET 17 could be arranged with corresponding additional electronic components and between the voltage source Ub and the heating element 12.
  • the circuit arrangement according to the invention is activated, for example, by a signal of a control system, for example in connection with a building management system or with thermostats. Their preferred operation is explained below with reference to two examples, in Example 1 when using an AC voltage source and in Example 2 when using a DC voltage source. Both voltage sources advantageously provide a voltage of 24 V.
  • the processor 18 also receives a signal from the sensor which detects the position of the plunger of the valve.
  • the heating element 12 is always activated by the circuit arrangement only for a short time. This ensures that the position of the plunger 4 can be adjusted continuously without noticeable control oscillation.
  • the processor 18 When the heating element 12 is to be heated, the processor 18 is activated. It supplies in accordance with the frequency of the AC voltage, preferably 50 Hz, per half-wave of the AC voltage, an ignition pulse to the TRIAC 16, the thus permanently permeable to current. At the same time, the MOSFET 17 in the positive half cycle of the AC voltage is switched current-passing through a control pulse of the processor 18, while in the negative half cycle of the AC voltage, the diode 21 provides the required current flow. The power supply of the heating element 12 remains in existence until the plunger of the valve to be adjusted has reached a desired position. By then, for example, from the plunger itself or a sensor associated with a corresponding monitoring circuit signal triggered then the circuit can be interrupted, so that the heating element 12 is no longer heated.
  • the operation of the circuit arrangement described for the use of an alternating voltage basically also applies when using a DC voltage source.
  • the processor 18 in this case provides a control signal to the MOSFET 17, which then switches the DC voltage and thereby provides the required current flow.
  • the TRIAC 16 is ignited once by an ignition pulse of the processor 18. This must be done every time the MOSFET 17 is switched current-passing through a control pulse of the processor 18, thus in particular after each new switch-on.

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  • Temperature-Responsive Valves (AREA)
  • Details Of Valves (AREA)
  • Control Of Resistance Heating (AREA)

Description

Die Erfindung betrifft eine Anordnung mit einem Ventil und eine Schaltungsanordnung zur Einstellung desselben gemäß Patentanspruch 1.The invention relates to an arrangement with a valve and a circuit arrangement for adjusting the same according to claim 1.

Eine solche Schaltungsanordnung kann beispielsweise für Anlagen der Heizungs- und Lüftungstechnik eingesetzt werden. Sie kann grundsätzlich überall dort verwendet werden, wo durch ein Ventil eine Verstellbewegung durchgeführt werden soll. Es können dadurch beispielsweise Klappen bewegt oder lichte Rohrquerschnitte verändert werden. Ohne Einschränkung der allgemeinen Verwendbarkeit der Schaltungsanordnung nach der Erfindung beziehen sich die weiteren Ausführungen auf den Einsatz derselben zur Einstellung von Ventilen einer Warmwasser-Heizungsanlage.Such a circuit arrangement can be used for example for systems of heating and ventilation technology. It can basically be used wherever an adjustment movement is to be performed by a valve. It can be moved, for example, flaps or light pipe cross sections are changed. Without limiting the general applicability of the circuit arrangement according to the invention, the further embodiments relate to the use of the same for setting valves of a hot water heating system.

Derartige Heizungsanlagen können in unterschiedlichen Gebäuden installiert werden, wie beispielsweise Bürogebäude, Krankenhäuser, Hotels, Mietshäuser oder Villen. Die Ventile der Heizungsanlagen können - je nach Gebäudetyp - an unterschiedlichen Stellen in Rohrleitungen eingebaut bzw. mit denselben verbunden werden. Solche Stellen sind beispielsweise Heizkreisverteiler, in denen eine größere Anzahl von Ventilen dicht beieinander angeordnet ist.Such heating systems can be installed in different buildings, such as office buildings, hospitals, hotels, apartment buildings or villas. Depending on the type of building, the valves of the heating systems can be installed at different places in pipelines or connected to them. Such locations are, for example, heating circuit manifolds, in which a larger number of valves is arranged close to each other.

In der DE 31 40 472 C2 ist eine Anordnung beschrieben, bei welcher der Stößel eines Ventils durch Einwirkung von elektrischem Strom bewegt wird. Die Anordnung ist mit einem temperaturabhängigen Dehnkörper ausgerüstet, an dem ein elektrischer Widerstand als Heizelement angebracht ist, der zu seiner Erwärmung mit einer elektrischen Spannungsquelle verbunden wird. Ein beispielsweise von einem Thermostat oder einer Schaltuhr geliefertes Signal bewirkt, daß der Widerstand mit Strom versorgt wird. Durch die dann erzeugte Wärme wird der Arbeitskolben des Dehnkörpers und durch denselben der Stößel des Ventils verstellt. Der Stößel des bei dieser bekannten Anordnung in Ruhestellung geschlossenen Ventils wird dadurch entlastet und durch eine Ventilfeder in Richtung "Öffnung des Ventils" bewegt.In the DE 31 40 472 C2 an arrangement is described in which the plunger of a valve is moved by the action of electric current. The arrangement is equipped with a temperature-dependent expansion element, to which an electrical resistance is attached as a heating element, which is connected to its heating with an electrical voltage source. For example, a signal provided by a thermostat or a timer causes the resistor to be energized becomes. By the heat then generated, the working piston of the expansion body and by the same the plunger of the valve is adjusted. The plunger of the closed in this known arrangement in the rest position valve is thereby relieved and moved by a valve spring in the direction of "opening of the valve".

Der Erfindung liegt die Aufgabe zugrunde, die eingangs geschilderte Schaltungsanordnung so zu gestalten, daß das Heizelement unabhängig von der Art der eingesetzten elektrischen Spannungsquelle mit Strom versorgt werden kann.The invention has for its object to make the above-described circuit arrangement so that the heating element can be powered regardless of the type of electrical voltage source used.

Diese Aufgabe wird durch die Gesamtheit der Merkmale des Patentanspruchs 1 gelöst.This object is solved by the entirety of the features of claim 1.

TRIAC und MOSFET sind seit langem bekannte, elektronische Bauteile. Ein TRIAC hat eine Steuerelektrode - im folgenden kurz "Gate" genannt - und zwei Hauptelektroden. Er stellt im Prinzip eine Antiparallelschaltung von zwei Thyristoren dar, so daß er Wechselstrom schalten kann. Dazu muß er nach jedem Nulldurchgang des Wechselstroms gezündet werden. Ein MOSFET ist ein Feldeffekttransistor mit den drei Elektroden "Gate" (Steuerelektrode), "Drain" (Abfluß) und "Source" (Quelle). Auf die grundsätzlich bekannte Wirkungsweise dieser beiden Bauteile wird im Folgenden nicht näher eingegangen. Aus der EP 0 627 808 A2 ist es auch bekannt, einen TRIAC in Reihe mit zwei in Reihe liegenden MOSFETs anzuordnen. Diese Druckschrift bezieht sich auf ein Steuerungssystem für einen elektrischen Umrichter, durch welchen die Frequenz von elektrischen Synchronmotoren zugeführtem Strom geändert werden kann.TRIAC and MOSFET are well-known electronic components. A TRIAC has a control electrode - hereafter referred to as "gate" - and two main electrodes. It is in principle an anti-parallel connection of two thyristors, so that it can switch AC. For this it must be ignited after each zero crossing of the alternating current. A MOSFET is a field effect transistor with the three electrodes "gate", "drain" and "source". On the principle known effect of these two components will not be discussed in more detail below. From the EP 0 627 808 A2 It is also known to arrange a TRIAC in series with two series MOSFETs. This document relates to a control system for an electric converter, by which the frequency of current supplied by synchronous electric motors can be changed.

Bei Einsatz der zu der Anordnung nach der Erfindung gehörenden Schaltungsanordnung kann ein Ventil durch Erwärmung des Heizelements sowohl mit Wechselstrom als auch mit Gleichstrom eingestellt werden, ohne daß an seinem Aufbau etwas geändert werden muß. Bei Verwendung von Wechselstrom wird der TRIAC durch den Prozessor mit ausreichend hoher Frequenz stromdurchlässig geschaltet, wobei gleichzeitig auch der MOSFET in der positiven Halbwelle des Wechselstroms durch den Prozessor stromdurchlässig geschaltet wird. In der negativen Halbwelle des Wechselstroms sorgt die Diode des MOSFETs für den notwendigen Stromfluß. Bei Einsatz von Gleichstrom erfolgt der erforderliche Stromfluß über den MOSFET. Dabei wird der TRIAC durch den Prozessor jedes Mal gezündet, wenn die Gleichspannungsquelle eingeschaltet wird. Durch den Prozessor und mittels eines Sensors zur Detektion der Position des Stößels des Ventils wird das Ventil bei dieser Schaltungsanordnung immer nur genau so lange für einen bestimmten Bruchteil einer Zeiteinheit, beispielsweise einer Sekunde, angesteuert, daß sich der Stößel ohne merkliche Regelschwingung zwischen einer oberen Position und einer unteren Position einstellen läßt.When using the arrangement according to the invention belonging to the circuit arrangement, a valve can be adjusted by heating the heating element both with alternating current and with direct current, without having to be changed at its structure something. When AC is used, the TRIAC is switched current-passing through the processor at a sufficiently high frequency, and at the same time, the MOSFET in the positive half cycle of the alternating current is also switched through by the processor. In the negative half-wave of the alternating current, the diode of the MOSFET provides the necessary current flow. When using DC, the required current flow through the MOSFET. In this case, the TRIAC is ignited by the processor each time the DC power source is turned on. By the processor and by means of a sensor for detecting the position of the plunger of the valve, the valve is in this circuit always just as long for a certain fraction of a unit time, for example, a second driven, that the plunger without noticeable control oscillation between an upper position and a lower position.

Die Anordnung und die Schaltungsanordnung nach der Erfindung werden anhand der Zeichnungen als Ausführungsbeispiel erläutert.The arrangement and the circuit arrangement according to the invention will be explained with reference to the drawings as an exemplary embodiment.

Es zeigen:

  • Fig. 1 schematisch eine Anordnung zur Einstellung eines Ventils in beispielhafter Ausführungsform.
  • Fig. 2 eine Schaltungsanordnung nach der Erfindung, ebenfalls in schematischer Darstellung.
Show it:
  • Fig. 1 schematically an arrangement for adjusting a valve in an exemplary embodiment.
  • Fig. 2 a circuit arrangement according to the invention, also in a schematic representation.

Das Ventil, das mit der Schaltungsanordnung dieser Anordnung eingestellt wird, kann sowohl den Zustand "stromlos offen" als auch den Zustand "stromlos geschlossen" haben. "Stromlos offen" bedeutet dabei, daß das Ventil geöffnet ist, wenn das Heizelement des zugehörigen Stellelements nicht erwärmt, also nicht mit Strom versorgt wird. Dieser Zustand ist beispielsweise in der DE 10 2009 040 098 A1 beschrieben. Der Zustand "stromlos geschlossen" entspricht dem entgegengesetzten Zustand, so wie er beispielsweise in der DE 31 40 472 C2 beschrieben ist. Bei Einschaltung der zur Schaltungsanordnung gehörenden Spannungsquelle wird das jeweilige Heizelement erwärmt, so daß das Ventil in den jeweils anderen Zustand überführt wird.The valve which is set with the circuit arrangement of this arrangement can have both the state "normally open" and the state "normally closed". "Normally open" means that the valve is open when the heating element of the associated control element is not heated, that is not supplied with power. This condition is for example in the DE 10 2009 040 098 A1 described. The state "normally closed" corresponds to the opposite state, as it is for example in the DE 31 40 472 C2 is described. When switching on the power source belonging to the circuit, the respective heating element is heated, so that the valve is transferred to the other state.

Das temperaturabhängige Stellelement kann ein Dehnelement entsprechend der DE 31 40 472 C2 oder ein Element aus einer Form-Gedächtnis-Legierung sein, wie sie beispielsweise in der EP 1 926 928 B1 beschrieben ist.The temperature-dependent actuator can be an expansion element according to the DE 31 40 472 C2 or an element of a shape-memory alloy, as described for example in the EP 1 926 928 B1 is described.

Die in Fig. 1 schematisch dargestellte Anordnung 1 ist mit einem als Dehnkörper 2 ausgeführten temperaturabhängigen Stellelement ausgerüstet. Die Anordnung 2 kann auf ein nur schematisch angedeutetes Ventil 3 aufgesetzt werden. Das Ventil 3 hat einen Stößel 4, der unter der Wirkung einer der Einfachheit halber nicht mit dargestellten Ventilfeder steht und in Richtung des Doppelpfeiles 5 zwischen einer Offenstellung und einer Schließstellung verstellbar ist. Der Stutzen 6 des Ventils 3 ist beispielsweise mit einem Gewinde ausgerüstet, auf welches ein Halter 7 aufgeschraubt werden kann, der zur Festlegung eines Gehäuses 8 der Anordnung 1 am Ventil 3 dient.In the Fig. 1 schematically illustrated arrangement 1 is equipped with a designed as an expansion body 2 temperature-dependent actuator. The arrangement 2 can be placed on a valve 3 indicated only schematically. The valve 3 has a plunger 4, which is under the action of one of the sake of simplicity not shown valve spring and is adjustable in the direction of the double arrow 5 between an open position and a closed position. The nozzle 6 of the valve 3 is equipped, for example, with a thread on which a holder 7 can be screwed, which serves to fix a housing 8 of the arrangement 1 on the valve 3.

Die Anordnung 1 selbst besteht - ohne Gehäuse 8 und Halter 7 - aus dem temperaturabhängigen Dehnkörper 2, einem etwa topfartigen Stellglied 9 und einer Druckfeder 10. Der Dehnkörper 2 hat einen Arbeitskolben 11. Am Dehnkörper 2 ist außerdem ein als Heizelement 12 dienender elektrischer Widerstand angebracht, der über eine elektrische Leitung 13 und einen elektrischen Kontakt 14 an eine Spannungsquelle anschließbar ist. Als Heizelement wird mit Vorteil ein PTC-Widerstand eingesetzt.The arrangement 1 itself consists - without housing 8 and holder 7 - from the temperature-dependent expansion body 2, an approximately cup-like actuator 9 and a compression spring 10. The expansion element 2 has a working piston 11. At the expansion element 2 also serving as a heating element 12 electrical resistance is attached , which is connectable via an electrical line 13 and an electrical contact 14 to a voltage source. As a heating element, a PTC resistor is used with advantage.

Die Anordnung nach Fig. 1 arbeitet beispielsweise wie folgt:

  • Sobald die Anordnung 1 an eine Spannungsquelle angeschlossen ist, wird das Heizelement 12 erwärmt. Der Dehnkörper 2 dehnt sich dann aus, wodurch sein Arbeitskolben 11 aus demselben herausgedrückt wird. Er nimmt das Stellglied 9 in Richtung des Pfeiles 15 mit. Dadurch wird die Druckfeder 10 zusammengedrückt. Der Stößel 4 des Ventils 3 wird entlastet, so daß dasselbe durch seine Ventilfeder geöffnet wird. Wenn der Arbeitskolben 11 des Dehnkörpers 2 einen vorgebbaren Hub durchgeführt hat, wird das Heizelement 12 von der Spannungsquelle getrennt. Der Dehnkörper 2 kühlt ab und der Arbeitskolben 11 sowie das Stellglied 9 gehen in ihre Ausgangsposition zurück.
The arrangement after Fig. 1 for example, works as follows:
  • Once the assembly 1 is connected to a voltage source, the heating element 12 is heated. The expansion body 2 then expands, whereby its working piston 11 is pushed out of the same. He takes the actuator 9 in the direction of arrow 15. As a result, the compression spring 10 is compressed. The plunger 4 of the valve 3 is relieved, so that the same is opened by its valve spring. When the working piston 11 of the expansion body 2 has performed a predetermined stroke, the heating element 12 is disconnected from the voltage source. The expansion body 2 cools and the working piston 11 and the actuator 9 go back to their original position.

Mit der in Fig. 2 schematisch dargestellten Schaltungsanordnung kann das Heizelement 12 sowohl mit Wechselstrom als auch mit Gleichstrom versorgt werden.With the in Fig. 2 schematically illustrated circuitry, the heating element 12 can be supplied with both AC and DC.

Das Heizelement 12 ist dazu in einem Stromkreis angeordnet, der zwischen einer Spannungsquelle Ub und einem Bezugspotential M verläuft, bei dem es sich mit Vorteil um Masse bzw. Erdpotential handelt. Im Stromkreis liegen ein TRIAC 16 und ein MOSFET 17 in Reihe, und zwar in bevorzugter Ausführungsform zwischen dem Heizelement 12 und dem Bezugspotential M. Der TRIAC 16 ist zwischen dem Heizelement 12 und dem MOSFET 17 angeschlossen. Die Steuerelektroden bzw. Gates von TRIAC 16 und MOSFET 17 sind mit einem von einer Spannungsquelle gespeisten Prozessor 18 verbunden. Die Elektroden 19 (Drain) und 20 (Source) des MOSFETs 17 sind durch eine Diode 21 miteinander verbunden, die in Richtung des TRIACs 16 stromdurchlässig ist. Zur Schaltungsanordnung gehört auch ein nicht mit dargestellter, grundsätzlich bekannter Sensor, welcher die Position des Stößels 4 des Ventils erfaßt und entsprechende Signale an den Prozessor 18 liefert.The heating element 12 is arranged in a circuit which runs between a voltage source Ub and a reference potential M, which is advantageously ground or ground potential. In the circuit, a TRIAC 16 and a MOSFET 17 are connected in series, in a preferred embodiment between the heating element 12 and the reference potential M. The TRIAC 16 is connected between the heating element 12 and the MOSFET 17. The gates of TRIAC 16 and MOSFET 17 are connected to a processor 18 powered by a voltage source. The electrodes 19 (drain) and 20 (source) of the MOSFET 17 are interconnected by a diode 21 which is current-permeable in the direction of the TRIAC 16. The circuit also includes a not-shown, basically known sensor which detects the position of the plunger 4 of the valve and supplies corresponding signals to the processor 18.

Die Spannungsquelle für den Prozessor 18 kann eine separate Spannungsquelle sein. Es kann aber auch die Spannungsquelle Ub eingesetzt werden. Die Reihenschaltung aus TRIAC 16 und MOSFET 17 könnte mit entsprechenden zusätzlichen elektronischen Bauteilen auch zwischen der Spannungsquelle Ub und dem Heizelement 12 angeordnet sein.The voltage source for the processor 18 may be a separate voltage source. However, the voltage source Ub can also be used. The series connection of TRIAC 16 and MOSFET 17 could be arranged with corresponding additional electronic components and between the voltage source Ub and the heating element 12.

Die Schaltungsanordnung nach der Erfindung wird beispielsweise durch ein Signal eines Regelsystems aktiviert, beispielsweise in Verbindung mit einer Gebäudeleittechnik oder mit Thermostaten. Ihre bevorzugte Arbeitsweise wird im Folgenden anhand von zwei Beispielen erläutert, und zwar im Bespiel 1 bei Einsatz einer Wechselspannungsquelle und im Beispiel 2 bei Einsatz einer Gleichspannungsquelle. Beide Spannungsquellen liefern mit Vorteil eine Spannung von 24 V. In beiden Fällen erhält der Prozessor 18 auch ein Signal von dem Sensor, welcher die Position des Stößels des Ventils erfaßt. Das Heizelement 12 wird mittels der Schaltungsanordnung immer nur kurzzeitig angesteuert. Dadurch ist sichergestellt, daß die Position des Stößels 4 stetig, ohne merkliche Regelschwingung eingestellt werden kann.The circuit arrangement according to the invention is activated, for example, by a signal of a control system, for example in connection with a building management system or with thermostats. Their preferred operation is explained below with reference to two examples, in Example 1 when using an AC voltage source and in Example 2 when using a DC voltage source. Both voltage sources advantageously provide a voltage of 24 V. In both cases, the processor 18 also receives a signal from the sensor which detects the position of the plunger of the valve. The heating element 12 is always activated by the circuit arrangement only for a short time. This ensures that the position of the plunger 4 can be adjusted continuously without noticeable control oscillation.

Beispiel 1example 1

Wenn das Heizelement 12 erwärmt werden soll, wird der Prozessor 18 aktiviert. Er liefert nach Maßgabe der Frequenz der Wechselspannung, vorzugsweise 50 Hz, pro Halbwelle der Wechselspannung einen Zündimpuls an den TRIAC 16, der damit dauernd stromdurchlässig geschaltet wird. Gleichzeitig wird der MOSFET 17 in der positiven Halbwelle der Wechselspannung durch einen Steuerimpuls des Prozessors 18 stromdurchlassig geschaltet, während in der negativen Halbwelle der Wechselspannung die Diode 21 für den erforderlichen Stromfluß sorgt. Die Stromversorgung des Heizelements 12 bleibt solange bestehen, bis der Stößel des einzustellenden Ventils eine gewünschte Position erreicht hat. Durch ein dann beispielsweise vom Stößel selbst bzw. einem zu einer zugehörigen Überwachungsschaltung gehörenden Sensor ausgelöstes Signal kann daraufhin der Stromkreis unterbrochen werden, so daß das Heizelement 12 nicht mehr erwärmt wird.When the heating element 12 is to be heated, the processor 18 is activated. It supplies in accordance with the frequency of the AC voltage, preferably 50 Hz, per half-wave of the AC voltage, an ignition pulse to the TRIAC 16, the thus permanently permeable to current. At the same time, the MOSFET 17 in the positive half cycle of the AC voltage is switched current-passing through a control pulse of the processor 18, while in the negative half cycle of the AC voltage, the diode 21 provides the required current flow. The power supply of the heating element 12 remains in existence until the plunger of the valve to be adjusted has reached a desired position. By then, for example, from the plunger itself or a sensor associated with a corresponding monitoring circuit signal triggered then the circuit can be interrupted, so that the heating element 12 is no longer heated.

Beispiel 2Example 2

Die für den Einsatz einer Wechselspannung geschilderte Arbeitsweise der Schaltungsanordnung gilt grundsätzlich auch bei Einsatz einer Gleichspannungsquelle. Der Prozessor 18 liefert in diesem Fall ein Steuersignal an den MOSFET 17, der dann die Gleichspannung schaltet und dadurch für den erforderlichen Stromfluß sorgt. Gleichzeit mit dem Einschalten des MOSFETs 17 wird der TRIAC 16 durch einen Zündimpuls des Prozessors 18 einmal gezündet. Das muß:jedes Mal geschehen, wenn der MOSFET 17 durch einen Steuerimpuls des Prozessors 18 stromdurchlassig geschaltet wird, also insbesondere nach jedem neuen Einschaltvorgang.The operation of the circuit arrangement described for the use of an alternating voltage basically also applies when using a DC voltage source. The processor 18 in this case provides a control signal to the MOSFET 17, which then switches the DC voltage and thereby provides the required current flow. Simultaneously with the switching on of the MOSFET 17, the TRIAC 16 is ignited once by an ignition pulse of the processor 18. This must be done every time the MOSFET 17 is switched current-passing through a control pulse of the processor 18, thus in particular after each new switch-on.

Claims (4)

  1. Arrangement comprising a valve (3), which has a valve tappet (4) that is subject to the action of a valve spring and is adjustable in an axial direction, in which arrangement, for the purpose of adjusting the valve tappet (4), a temperature-dependent actuating element equipped with a working piston (11) that is movable in its axial direction is fixed to the valve (3), which is heatable by an electrical heating element (12) that can be connected to an electrical voltage source, and in which arrangement a circuit arrangement is present, characterized in that there are arranged in the circuit arrangement for the purpose of setting the valve (3) in the current supply for the heating element (12) a TRIAC (16) and a MOSFET (17) connected in series, the control electrodes of which are connected to a processor (18), which delivers trigger pulses for the TRIAC (16) and control signals for the MOSFET (17), and a diode (21) forward-biased in the direction of the TRIAC (16) is connected in said circuit arrangement between the drain (19) and source (20) electrodes of the MOSFET (17).
  2. Circuit arrangement for an arrangement according to claim 1, characterized in that the series circuit comprising TRIAC (16) and MOSFET (17) is arranged between the heating element (12) and a reference potential (11), wherein the TRIAC (16) is connected to the heating element (12).
  3. Circuit arrangement for an arrangement according to claim 1 or 2, characterized in that the TRIAC (16), with the use of an AC voltage source, is triggered by the processor (18) per half-cycle of the AC voltage.
  4. Circuit arrangement for an arrangement according to claim 1 or 2, characterized in that the TRIAC (16) with the use of a DC voltage source, is triggered once by the processor (18) upon each switch-on process carried out for the heating of the heating element (12).
EP14155493.1A 2014-02-18 2014-02-18 Switching assembly for adjusting a valve Active EP2908036B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP14155493.1A EP2908036B1 (en) 2014-02-18 2014-02-18 Switching assembly for adjusting a valve
DK14155493.1T DK2908036T3 (en) 2014-02-18 2014-02-18 Switching arrangement for setting a valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14155493.1A EP2908036B1 (en) 2014-02-18 2014-02-18 Switching assembly for adjusting a valve

Publications (2)

Publication Number Publication Date
EP2908036A1 EP2908036A1 (en) 2015-08-19
EP2908036B1 true EP2908036B1 (en) 2016-02-17

Family

ID=50151129

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14155493.1A Active EP2908036B1 (en) 2014-02-18 2014-02-18 Switching assembly for adjusting a valve

Country Status (2)

Country Link
EP (1) EP2908036B1 (en)
DK (1) DK2908036T3 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3140472C2 (en) * 1981-10-12 1984-07-19 Hellmuth 3320 Salzgitter Möhlenhoff Actuator for operating a valve arranged in a hot water circuit of a heating system
IT1266376B1 (en) * 1993-05-31 1996-12-27 Merloni Antonio Spa IMPROVEMENT IN THE DRIVING SYSTEMS OF ELECTRONIC INVERTERS.
DE19910750A1 (en) * 1999-03-11 2000-09-14 Andreas Moehlenhoff Procedure for adjusting a valve
US7196295B2 (en) * 2003-11-21 2007-03-27 Watlow Electric Manufacturing Company Two-wire layered heater system

Also Published As

Publication number Publication date
EP2908036A1 (en) 2015-08-19
DK2908036T3 (en) 2016-05-30

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