EP2180493A1 - Control circuit for a relay for relay-operated gas valves - Google Patents

Control circuit for a relay for relay-operated gas valves Download PDF

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Publication number
EP2180493A1
EP2180493A1 EP20100001080 EP10001080A EP2180493A1 EP 2180493 A1 EP2180493 A1 EP 2180493A1 EP 20100001080 EP20100001080 EP 20100001080 EP 10001080 A EP10001080 A EP 10001080A EP 2180493 A1 EP2180493 A1 EP 2180493A1
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EP
European Patent Office
Prior art keywords
transistor
relay
circuit
collector
capacitor
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.)
Granted
Application number
EP20100001080
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German (de)
French (fr)
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EP2180493B1 (en
Inventor
Derk Vegter
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.)
Garrett Motion SARL
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Honeywell Technologies SARL
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Publication date
Priority claimed from DE102004016764A external-priority patent/DE102004016764B3/en
Priority claimed from DE200410045031 external-priority patent/DE102004045031B4/en
Application filed by Honeywell Technologies SARL filed Critical Honeywell Technologies SARL
Publication of EP2180493A1 publication Critical patent/EP2180493A1/en
Application granted granted Critical
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/002—Monitoring or fail-safe circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
    • 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
    • H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
    • H01H47/20—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for producing frequency-selective operation of the relay

Definitions

  • the invention relates to a drive circuit for a relay of a relay-operated gas valve.
  • the present invention based on the problem to provide a novel drive circuit for a relay of a relay-operated gas valve. This problem is solved by a drive circuit having the features of claim 1.
  • Fig. 1 shows a control circuit 10 according to the invention for relay-operated gas valves, wherein the control circuit according to the invention comprises a relay 11 and a fail-safe circuit 12 for the relay 11.
  • the fail-safe circuit 12 has an input 13, to which a non-illustrated control device, in particular a designed as a microprocessor control device, can be connected.
  • the control device provides an input signal at the input 13 of the fail-safe circuit 12 or at the input 13 of the control circuit 10, wherein in the sense of the present invention, the fail-safe circuit 12 only at the relay 11 for opening the gas valve provides required voltage when at the input 13 of the control device, a signal having at least two different, temporally successive frequency signals is provided.
  • the fail-safe circuit 12 of the control circuit 10 comprises a charging circuit 14 and a drive circuit 15.
  • the charging circuit 14 comprises the in Fig. 1 with a dashed box framed components; the components of the drive circuit 15 are in Fig. 1 framed by a dot-dash box.
  • the charging circuit 14 comprises a capacitor 16, wherein parallel to the capacitor 16, two diodes 17 and 18 are connected.
  • Fig. 1 shows that the cathode of the diode 18 acts on the anode of the diode 17.
  • the capacitor 16 is connected in parallel to the two diodes 17 and 18 such that the capacitor acts on the one hand on the cathode of the diode 17 and on the other hand on the anode of the diode 18.
  • a resistor 19 attacks which is connected with the interposition of the capacitors 20, 21, 22 and 23 to the input 13 of the fail-safe circuit 12.
  • four capacitors 20 to 23 can be used only a capacitor with a correspondingly sized capacity.
  • the drive circuit 15 includes, inter alia, two transistors 24 and 25.
  • a first transistor 24 is connected to its base with the interposition of a resistor 26 to the capacitor 16 of the charging circuit 14.
  • the collector of the transistor 24, according to Fig. 1 is designed as an NPN transistor, 27 is connected to a supply voltage V of the control circuit 10 according to the invention with the interposition of another resistor. With its emitter, however, the transistor 24 is connected to a ground potential or ground potential.
  • a second transistor 25 is connected to the first transistor 24 in such a way that the collector of the second transistor 25, which, like the first transistor 24, is designed as an NPN transistor, is connected to the base of the first transistor 24.
  • the emitter of the second transistor 25 as well as the emitter of the first transistor 24 is connected to the ground potential or ground potential.
  • the base of the second transistor 25 is connected to the input 13 of the control circuit 10 with the interposition of a resistor 28.
  • the drive circuit 15 further comprises two Darlington transistor circuits 29 and 30, each having two transistors connected in the so-called Darlington circuit.
  • the two transistors of the Darlington transistor circuit 29 are formed as NPN transistors, the two transistors of the Darlington transistor circuit 30, however, are designed as PNP transistors.
  • the two Darlington transistor circuits 29 and 30 are connected together at their base and coupled to the collector of the transistor 24. Furthermore, can Fig. 1 it can be seen that also the emitters of the Darlington transistor circuits 29 and 30 are connected to one another, wherein at this connection point 31 the emitter acts on a series arrangement of a resistor 32 and a capacitor 33.
  • the collector of the Darlington transistor circuit 29 is connected to the potential of the supply voltage V, the collector of the Darlington transistor circuit 30, however, together with the emitters of the transistors 24 and 25 at the ground potential.
  • Parallel to the relay 11, a diode 34 is connected, wherein the diode 34 is connected to its anode at the collector of the Darlington transistor circuit 29 and with its cathode to the capacitor 33.
  • control circuit 10 according to the invention or the fail-safe circuit 12 of the same only at the relay 11 provides a voltage required to open the gas valve when at the input 13 of the fail-safe circuit 12 of the control device at least two different, temporally successive frequency signals comprehensive input signal is provided. In this case, there is a defined for opening the gas valve operating state of the control device.
  • the gas valve is opened by the relay 11 only when the signal provided by the control device at the input 13 comprises two frequency signals, namely a first frequency signal having a frequency of approximately 1000 kHz and a second frequency signal having a frequency of about 5 kHz, which are present in temporal succession in the signal provided by the controller in the control unit, respectively, after a period of in about 40 ms with the first frequency signal of about 1000 kHz followed by a time period of about 80 ms with the second frequency signal of about 5 kHz.
  • Fig. 2 visualizes such an input signal provided by the control device in solid lines, with each of a time t 1 with the frequency signal of about 1000 kHz, a time t 2 followed by the frequency signal of about 5 kHz.
  • the control circuit 10 now operates in such a way that when the first frequency signal of approximately 1000 kHz is present at the input 13 of the fail-safe circuit 12, the charging circuit 14 charges the capacitor 16 thereof.
  • the capacitor 16 of the charging circuit 14 can not be charged, but during the period in which the second frequency signal of about 5 kHz is applied, a discharge of the capacitor 16 of Charging circuit 14 via the resistor 26 and the base of the transistor 24 instead.
  • a rectangular 5 kHz signal is applied during the period in which the second frequency signal of approximately 5 kHz is applied to the input 13, at the connection point 31 is applied a rectangular 5 kHz signal.
  • the capacitor 33 of the drive circuit 15 is charged, on the other hand, a discharge takes place via the relay 11.
  • a direct current flows through the relay 11.
  • the capacitor 33 of the drive circuit 15 can discharge via the relay 11.
  • the transistor 24 of the drive circuit 15 is only conductive if, via the discharge of the capacitor 16, a current flows at the base thereof.
  • the capacitor 16 of the charging circuit 14 is charged, but the drive circuit 15 is due to the so-called feedback capacitance of the transistor 25 and due the relatively large resistor 28 is not conductive.
  • the drive circuit 15 is only conductive when, during the period in which at the input 13, the second frequency signal with the relatively low frequency of 5 kHz is applied, the capacitor 16 of the charging circuit 14 via the resistor 26 and the base of the first transistor 24 discharges.
  • the charging and discharging of the capacitor 16 of the charging circuit 14 during the periods t 1 and t 2 with the different frequency signals is in Fig. 2 represented by the dashed line 35. As Fig.
  • the capacitor 16 is charged during the period t 1 , in which the first frequency signal of about 1000 kHz, while the time t 2 , in which the second frequency signal of about 5 kHz is applied, finds a discharge of the capacitor 16 instead.
  • a voltage required to open the gas valve can be permanently provided at the relay 11.
  • the capacitor 33 of the drive circuit 15 discharges, whereby the voltage required to open the gas valve is maintained at the relay.
  • the drive circuit 15 is conductive and at the connection point 31 is a rectangular 5 kHz signal.
  • the capacitor 33 is charged, on the other hand, discharge takes place via the relay 11.
  • a DC current flows through the relay 11.
  • the transistor 25 is continuously conductive, whereby the voltage at the emitters of the Darlington transistor circuits 29 and 30 becomes high. Since, during the period in which the first frequency signal of approximately 1000 kHz is present at the input 13, the voltage required to open the gas valve is kept ready by discharging the capacitor 33 at the relay 11, this time must be shorter than the discharge time of the capacitor 33 ,
  • the capacitance of the capacitor 16 of the charging circuit 10 ⁇ F, the capacitance of the capacitors 20, 21, 22, 23 is 100 pF each.
  • the capacitance of the capacitor 33 of the drive circuit is preferably 47 ⁇ F.
  • the resistor 19 is preferably dimensioned with 1 k ⁇ , the resistor 28 with 1 M ⁇ .
  • the resistor 26 is preferably 47 k ⁇ , the resistor 27 100 k ⁇ .
  • the resistor 32 is preferably 51 ⁇ .
  • the supply voltage V is 24 V. With this dimensioning of the circuit, the discharge time of the capacitor 16 via the resistor 26 in about 116 ms, the charging time of the same is about 40 ms.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electronic Switches (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Control Of Combustion (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

The circuit has a relay (11) for opening and/or closing a gas valve, and a fail-safe circuit (12) for the relay. A regulating device is connected to an input (13) of the fail-safe circuit. The fail-safe circuit provides the relay with required voltage to open the gas valve when the input of the fail-safe circuit receives an input signal comprising two different, temporally successive frequency signals, from the regulating device.

Description

Die Erfindung betrifft eine Ansteuerschaltung für ein Relais eines relaisbetriebenen Gasventils.The invention relates to a drive circuit for a relay of a relay-operated gas valve.

Es sind Gasventile bekannt, die über ein Relais geöffnet bzw. geschlossen werden. Weiterhin ist es bekannt, solche Relais zum Öffnen bzw. Schließen von Gasventilen über eine als Mikroprozessor ausgebildete Regeleinrichtung anzusteuern. Hierbei ist von Bedeutung, dass die Gesamtanordnung ausfallsicher ist, dass also nur dann über ein Relais ein Gasventil geöffnet wird, wenn die Regeleinrichtung sich in einem definierten Zustand befindet. Liegt ein undefinierter Zustand der Regeleinrichtung vor, so muss gewährleistet sein, dass das Relais das Gasventil nicht öffnen kann. Steuerschaltungen für relaisbetriebene Gasventile verfügen hierzu neben dem Relais über eine Fail-Safe-Schaltung, die zwischen die als Mikroprozessor ausgebildete Regeleinrichtung und das Relais geschaltet ist. Durch die Verwendung solcher Fail-Safe-Schaltungen wird die Ausfallsicherheit der gesamten Anordnung gewährleistet.There are known gas valves that are opened or closed by a relay. Furthermore, it is known to control such relays for opening and closing of gas valves via a control device designed as a microprocessor. It is important that the overall arrangement is fail-safe, so that only a gas valve is opened via a relay when the control device is in a defined state. If there is an undefined state of the control device, it must be ensured that the relay can not open the gas valve. Control circuits for relay-operated gas valves have this in addition to the relay via a fail-safe circuit, which is connected between the designed as a microprocessor control device and the relay. By using such fail-safe circuits, the reliability of the entire arrangement is ensured.

Hiervon ausgehend liegt der vorliegenden Erfindung das Problem zu Grunde, eine neuartige Ansteuerschaltung für ein Relais eines relaisbetriebenen Gasventils zu schaffen. Dieses Problem wird durch eine Ansteuerschaltung mit den Merkmalen des Anspruchs 1 gelöst.On this basis, the present invention based on the problem to provide a novel drive circuit for a relay of a relay-operated gas valve. This problem is solved by a drive circuit having the features of claim 1.

Bevorzugte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung. Nachfolgend wird ein Ausführungsbeispiel der Erfindung, ohne hierauf beschränkt zu sein, anhand der Zeichnung näher erläutert. In der Zeichnung zeigt:

Fig. 1:
ein Schaltbild einer erfindungsgemäßen Steuerschaltung für relaisbetriebene Gasventile; und
Fig. 2:
ein Diagramm zur Verdeutlichung der Funktionsweise der erfindungsgemäßen Steuerschaltung für relaisbetriebene Gasventile.
Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Hereinafter, an embodiment of the invention, without being limited thereto, explained in more detail with reference to the drawing. In the drawing shows:
Fig. 1:
a circuit diagram of a control circuit according to the invention for relay-operated gas valves; and
Fig. 2:
a diagram illustrating the operation of the control circuit according to the invention for relay-operated gas valves.

Nachfolgend wird die hier vorliegende Erfindung unter Bezugnahme auf Fig. 1 und 2 in größerem Detail beschrieben.Hereinafter, the present invention will be described with reference to FIG Fig. 1 and 2 described in more detail.

Fig. 1 zeigt eine erfindungsgemäße Steuerschaltung 10 für relaisbetriebene Gasventile, wobei die erfindungsgemäße Steuerschaltung ein Relais 11 sowie eine Fail-Safe-Schaltung 12 für das Relais 11 umfasst. Die Fail-Safe-Schaltung 12 verfügt über einen Eingang 13, an welchem eine nicht-dargestellte Regeleinrichtung, insbesondere eine als Mikroprozessor ausgebildete Regeleinrichtung, angeschlossen werden kann. Die Regeleinrichtung stellt am Eingang 13 der Fail-Safe-Schaltung 12 bzw. am Eingang 13 der Steuerschaltung 10 ein Eingangssignal bereit, wobei im Sinne der hier vorliegenden Erfindung die Fail-Safe-Schaltung 12 nur dann an dem Relais 11 eine zum Öffnen des Gasventils erforderliche Spannung bereitstellt, wenn an dem Eingang 13 von der Regeleinrichtung ein mindestens zwei unterschiedliche, zeitlich aufeinanderfolgende Frequenzsignale aufweisendes Signal bereitgestellt wird. Fig. 1 shows a control circuit 10 according to the invention for relay-operated gas valves, wherein the control circuit according to the invention comprises a relay 11 and a fail-safe circuit 12 for the relay 11. The fail-safe circuit 12 has an input 13, to which a non-illustrated control device, in particular a designed as a microprocessor control device, can be connected. The control device provides an input signal at the input 13 of the fail-safe circuit 12 or at the input 13 of the control circuit 10, wherein in the sense of the present invention, the fail-safe circuit 12 only at the relay 11 for opening the gas valve provides required voltage when at the input 13 of the control device, a signal having at least two different, temporally successive frequency signals is provided.

Im Sinne der hier vorliegenden Erfindung umfasst die Fail-Safe-Schaltung 12 der erfindungsgemäßen Steuerschaltung 10 eine Ladeschaltung 14 sowie eine Ansteuerschaltung 15. Die Ladeschaltung 14 umfasst die in Fig. 1 mit einem gestrichelten Kasten umrahmten Bauelemente; die Bauelemente der Ansteuerschaltung 15 sind in Fig. 1 durch einen strichpunktierten Kasten umrahmt.For the purposes of the present invention, the fail-safe circuit 12 of the control circuit 10 according to the invention comprises a charging circuit 14 and a drive circuit 15. The charging circuit 14 comprises the in Fig. 1 with a dashed box framed components; the components of the drive circuit 15 are in Fig. 1 framed by a dot-dash box.

Wie Fig. 1 entnommen werden kann, umfasst die Ladeschaltung 14 einen Kondensator 16, wobei parallel zum Kondensator 16 zwei Dioden 17 und 18 geschaltet sind.As Fig. 1 can be removed, the charging circuit 14 comprises a capacitor 16, wherein parallel to the capacitor 16, two diodes 17 and 18 are connected.

Fig. 1 zeigt, dass die Kathode der Diode 18 an die Anode der Diode 17 angreift. Der Kondensator 16 ist derart parallel zu den beiden Dioden 17 und 18 geschaltet, dass der Kondensator einerseits an der Kathode der Diode 17 und andererseits an der Anode der Diode 18 angreift. Zwischen den beiden Dioden 17 und 18 greift ein Widerstand 19 an, der unter Zwischenschaltung der Kondensatoren 20, 21, 22 und 23 mit dem Eingang 13 der Fail-Safe-Schaltung 12 verbunden ist. Anstelle der in Fig. 1 dargestellten vier Kondensatoren 20 bis 23 kann auch lediglich ein Kondensator mit entsprechend dimensionierter Kapazität verwendet werden. Fig. 1 shows that the cathode of the diode 18 acts on the anode of the diode 17. The capacitor 16 is connected in parallel to the two diodes 17 and 18 such that the capacitor acts on the one hand on the cathode of the diode 17 and on the other hand on the anode of the diode 18. Between the two diodes 17 and 18, a resistor 19 attacks, which is connected with the interposition of the capacitors 20, 21, 22 and 23 to the input 13 of the fail-safe circuit 12. Instead of in Fig. 1 also shown, four capacitors 20 to 23 can be used only a capacitor with a correspondingly sized capacity.

Die Ansteuerschaltung 15 umfasst unter anderem zwei Transistoren 24 und 25. Ein erster Transistor 24 ist mit seiner Basis unter Zwischenschaltung eines Widerstands 26 an den Kondensator 16 der Ladeschaltung 14 angeschlossen. Der Kollektor des Transistors 24, der gemäß Fig. 1 als NPN-Transistor ausgebildet ist, ist unter Zwischenschaltung eines weiteren Widerstands 27 an eine Versorgungsspannung V der erfindungsgemäßen Steuerschaltung 10 angeschlossen. Mit seinem Emitter hingegen ist der Transistor 24 an ein Massepotential bzw. Erdepotential angeschlossen. Ein zweiter Transistor 25 ist derart mit dem ersten Transistor 24 verschaltet, dass der Kollektor des zweiten Transistors 25, der ebenso wie der erste Transistor 24 als NPN-Transistor ausgebildet ist, an die Basis des ersten Transistors 24 angeschlossen ist. Der Emitter des zweiten Transistors 25 ist ebenso wie der Emitter des ersten Transistors 24 an das Massepotential bzw. Erdepotential angeschlossen. Die Basis des zweiten Transistors 25 ist unter Zwischenschaltung eines Widerstands 28 an den Eingang 13 der Steuerschaltung 10 angeschlossen.The drive circuit 15 includes, inter alia, two transistors 24 and 25. A first transistor 24 is connected to its base with the interposition of a resistor 26 to the capacitor 16 of the charging circuit 14. The collector of the transistor 24, according to Fig. 1 is designed as an NPN transistor, 27 is connected to a supply voltage V of the control circuit 10 according to the invention with the interposition of another resistor. With its emitter, however, the transistor 24 is connected to a ground potential or ground potential. A second transistor 25 is connected to the first transistor 24 in such a way that the collector of the second transistor 25, which, like the first transistor 24, is designed as an NPN transistor, is connected to the base of the first transistor 24. The emitter of the second transistor 25 as well as the emitter of the first transistor 24 is connected to the ground potential or ground potential. The base of the second transistor 25 is connected to the input 13 of the control circuit 10 with the interposition of a resistor 28.

Gemäß Fig. 1 umfasst die Ansteuerschaltung 15 neben den beiden Transistoren 24, 25 sowie den Widerständen 26, 27 und 28 weiterhin zwei Darlington-Transistorschaltungen 29 und 30, die jeweils zwei in der sogenannten Darlington-Schaltung verschaltete Transistoren aufweisen.According to Fig. 1 In addition to the two transistors 24, 25 and the resistors 26, 27 and 28, the drive circuit 15 further comprises two Darlington transistor circuits 29 and 30, each having two transistors connected in the so-called Darlington circuit.

Gemäß Fig. 1 sind die beiden Transistoren der Darlington-Transistorschaltung 29 als NPN-Transistoren ausgebildet, die beiden Transistoren der Darlington-Transistorschaltung 30 hingegen sind als PNP-Transistoren ausgeführt.According to Fig. 1 the two transistors of the Darlington transistor circuit 29 are formed as NPN transistors, the two transistors of the Darlington transistor circuit 30, however, are designed as PNP transistors.

Die beiden Darlington-Transistorschaltungen 29 und 30 sind an ihrer Basis miteinander verbunden und an den Kollektor des Transistors 24 gekoppelt. Weiterhin kann Fig. 1 entnommen werden, dass auch die Emitter der Darlington-Transistorschaltungen 29 und 30 miteinander verbunden sind, wobei an diesem Verbindungspunkt 31 der Emitter eine Reihenschaltung aus einem Widerstand 32 und einem Kondensator 33 angreift. Der Kollektor der Darlington-Transistorschaltung 29 liegt am Potential der Versorgungsspannung V an, der Kollektor der Darlington-Transistorschaltung 30 hingegen liegt zusammen mit den Emittern der Transistoren 24 und 25 am Massepotential an. Parallel zum Relais 11 ist eine Diode 34 geschaltet, wobei die Diode 34 mit ihrer Anode am Kollektor der Darlington-Transistorschaltung 29 und mit ihrer Kathode mit dem Kondensator 33 verschaltet ist.The two Darlington transistor circuits 29 and 30 are connected together at their base and coupled to the collector of the transistor 24. Furthermore, can Fig. 1 it can be seen that also the emitters of the Darlington transistor circuits 29 and 30 are connected to one another, wherein at this connection point 31 the emitter acts on a series arrangement of a resistor 32 and a capacitor 33. The collector of the Darlington transistor circuit 29 is connected to the potential of the supply voltage V, the collector of the Darlington transistor circuit 30, however, together with the emitters of the transistors 24 and 25 at the ground potential. Parallel to the relay 11, a diode 34 is connected, wherein the diode 34 is connected to its anode at the collector of the Darlington transistor circuit 29 and with its cathode to the capacitor 33.

Wie bereits erwähnt, stellt die erfindungsgemäße Steuerschaltung 10 bzw. die Fail-Safe-Schaltung 12 derselben nur dann am Relais 11 eine zum Öffnen des Gasventils benötigte Spannung bereit, wenn am Eingang 13 der Fail-Safe-Schaltung 12 von der Regeleinrichtung ein mindestens zwei unterschiedliche, zeitlich aufeinanderfolgende Frequenzsignale umfassendes Eingangssignal bereitgestellt wird. In diesem Fall liegt ein zum Öffnen des Gasventils definierter Betriebszustand der Regeleinrichtung vor.As already mentioned, the control circuit 10 according to the invention or the fail-safe circuit 12 of the same only at the relay 11 provides a voltage required to open the gas valve when at the input 13 of the fail-safe circuit 12 of the control device at least two different, temporally successive frequency signals comprehensive input signal is provided. In this case, there is a defined for opening the gas valve operating state of the control device.

Im bevorzugten Ausführungsbeispiel der hier vorliegenden Erfindung wird vom Relais 11 das Gasventil nur dann geöffnet, wenn das von der Regeleinrichtung am Eingang 13 bereitgestellte Signal zwei Frequenzsignale umfasst, nämlich ein erstes Frequenzsignal mit einer Frequenz von in etwa 1000 kHz und ein zweites Frequenzsignal mit einer Frequenz von in etwa 5 kHz, die derart zeitlich hintereinanderfolgend in dem von der in der Regeleinrichtung bereitgestellten Signal vorliegen bzw. anliegen, dass sich jeweils nach einer Zeitspanne von in etwa 40 ms mit dem ersten Frequenzsignal von in etwa 1000 kHz eine Zeitspanne von in etwa 80 ms mit dem zweiten Frequenzsignal von in etwa 5 kHz anschließt. Fig. 2 visualisiert ein derartiges von der Regeleinrichtung bereitgestelltes Eingangssignal in durchgezogener Linienführung, wobei sich jeweils an eine Zeitspanne t1 mit dem Frequenzsignal von in etwa 1000 kHz eine Zeitspanne t2 mit dem Frequenzsignal von in etwa 5 kHz anschließt.In the preferred embodiment of the present invention, the gas valve is opened by the relay 11 only when the signal provided by the control device at the input 13 comprises two frequency signals, namely a first frequency signal having a frequency of approximately 1000 kHz and a second frequency signal having a frequency of about 5 kHz, which are present in temporal succession in the signal provided by the controller in the control unit, respectively, after a period of in about 40 ms with the first frequency signal of about 1000 kHz followed by a time period of about 80 ms with the second frequency signal of about 5 kHz. Fig. 2 visualizes such an input signal provided by the control device in solid lines, with each of a time t 1 with the frequency signal of about 1000 kHz, a time t 2 followed by the frequency signal of about 5 kHz.

Die erfindungsgemäße Steuerschaltung 10 arbeitet nun derart, dass bei Anliegen bzw. Vorliegen des ersten Frequenzsignals von in etwa 1000 kHz am Eingang 13 der Fail-Safe-Schaltung 12 die Ladeschaltung 14 den Kondensator 16 derselben auflädt. Während des Anliegens des zweiten Frequenzsignals von in etwa 5 kHz am Eingang 13 kann der Kondensator 16 der Ladeschaltung 14 hingegen nicht geladen werden, vielmehr findet während der Zeitspanne, in der das zweite Frequenzsignal von in etwa 5 kHz anliegt, eine Entladung des Kondensators 16 der Ladeschaltung 14 über den Widerstand 26 und die Basis des Transistors 24 statt. Weiterhin ist anzumerken, dass während der Zeitspanne, in der das zweite Frequenzsignal von in etwa 5 kHz am Eingang 13 anliegt, am Verbindungspunkt 31 ein rechteckförmiges 5 kHz Signal anliegt. Hierdurch wird einerseits über die Diode 34 der Kondensator 33 der Ansteuerschaltung 15 aufgeladen, andererseits erfolgt eine Entladung über das Relais 11. Bei der Entladung fließt ein Gleichstrom durch das Relais 11. In der Zeitspanne, in der das erste Frequenzsignal von in etwa 1000 kHz anliegt, kann sich der Kondensators 33 der Ansteuerschaltung 15 über das Relais 11 entladen. Der Transistor 24 der Ansteuerschaltung 15 ist nur dann leitend, falls über die Entladung des Kondensators 16 ein Strom an dessen Basis fließt.The control circuit 10 according to the invention now operates in such a way that when the first frequency signal of approximately 1000 kHz is present at the input 13 of the fail-safe circuit 12, the charging circuit 14 charges the capacitor 16 thereof. During the concern of the second frequency signal of about 5 kHz at the input 13, the capacitor 16 of the charging circuit 14, however, can not be charged, but during the period in which the second frequency signal of about 5 kHz is applied, a discharge of the capacitor 16 of Charging circuit 14 via the resistor 26 and the base of the transistor 24 instead. Furthermore, it should be noted that during the period in which the second frequency signal of approximately 5 kHz is applied to the input 13, at the connection point 31 is applied a rectangular 5 kHz signal. In this way, on the one hand via the diode 34, the capacitor 33 of the drive circuit 15 is charged, on the other hand, a discharge takes place via the relay 11. During discharge, a direct current flows through the relay 11. In the period in which the first frequency signal of approximately 1000 kHz is applied , the capacitor 33 of the drive circuit 15 can discharge via the relay 11. The transistor 24 of the drive circuit 15 is only conductive if, via the discharge of the capacitor 16, a current flows at the base thereof.

Während der Zeitspanne, zu der am Eingang 13 das erste Frequenzsignal mit der relativ hohen Frequenz von in etwa 1000 kHz anliegt, wird zwar der Kondensator 16 der Ladeschaltung 14 geladen, die Ansteuerschaltung 15 ist jedoch aufgrund der sogenannten Feedback-Kapazität des Transistors 25 und aufgrund des relativ großen Widerstands 28 nicht leitend. Die Ansteuerschaltung 15 ist nur dann leitend, wenn sich während der Zeitspanne, in der am Eingang 13 das zweite Frequenzsignal mit der relativ geringen Frequenz von 5 kHz anliegt, der Kondensator 16 der Ladeschaltung 14 über den Widerstand 26 und die Basis des ersten Transistors 24 entlädt. Das Laden sowie Entladen des Kondensators 16 der Ladeschaltung 14 während der Zeitspannen t1 und t2 mit den unterschiedlichen Frequenzsignalen ist in Fig. 2 durch die gestrichelte Linie 35 dargestellt. Wie Fig. 2 entnommen werden kann, wird während der Zeitspanne t1, in der das erste Frequenzsignal von in etwa 1000 kHz anliegt, der Kondensator 16 geladen, während der Zeitspanne t2 hingegen, in der das zweite Frequenzsignal von in etwa 5 kHz anliegt, findet eine Entladung des Kondensators 16 statt.During the period at which the first frequency signal at the relatively high frequency of approximately 1000 kHz is present at the input 13, the capacitor 16 of the charging circuit 14 is charged, but the drive circuit 15 is due to the so-called feedback capacitance of the transistor 25 and due the relatively large resistor 28 is not conductive. The drive circuit 15 is only conductive when, during the period in which at the input 13, the second frequency signal with the relatively low frequency of 5 kHz is applied, the capacitor 16 of the charging circuit 14 via the resistor 26 and the base of the first transistor 24 discharges. The charging and discharging of the capacitor 16 of the charging circuit 14 during the periods t 1 and t 2 with the different frequency signals is in Fig. 2 represented by the dashed line 35. As Fig. 2 can be removed, the capacitor 16 is charged during the period t 1 , in which the first frequency signal of about 1000 kHz, while the time t 2 , in which the second frequency signal of about 5 kHz is applied, finds a discharge of the capacitor 16 instead.

Durch Bereitstellen eines Signals am Eingang 13 der erfindungsgemäßen Steuerschaltung 10, in welchem die beiden Frequenzsignale von in etwa 1000 kHz und von in etwa 5 kHz zeitlich definiert aufeinanderfolgen, kann am Relais 11 permanent eine zum Öffnen des Gasventils benötigte Spannung bereitgestellt werden. In der Zeitspanne, in der am Eingang 13 das erste Frequenzsignal von in etwa 1000 kHz anliegt, entlädt sich der Kondensator 33 der Ansteuerschaltung 15, wodurch die zum Öffnen des Gasventils benötigte Spannung am Relais aufrechterhalten wird. Während der Zeitspanne, zu der am Eingang 13 das zweite Frequenzsignal von in etwa 5 kHz anliegt und sich der Kondensator 16 der Ladeschaltung 14 entlädt, ist die Ansteuerschaltung 15 leitend und am Verbindungspunkt 31 liegt ein rechteckförmiges 5 kHz Signal an. Hierdurch wird einerseits über die Diode 34 der Kondensator 33 aufgeladen, andererseits erfolgt eine Entladung über das Relais 11. Bei der Entladung fließt ein Gleichstrom durch das Relais 11. Während des Anliegens des ersten Frequenzsignals von in etwa 1000 kHz ist der Transistor 25 kontinuierlich leitend, wodurch die Spannung an den Emittern der Darlington-Transistorschaltungen 29 und 30 hoch wird. Da während der Zeitspanne, in der am Eingang 13 das erste Frequenzsignal von in etwa 1000 kHz anliegt, durch die Entladung des Kondensators 33 am Relais 11 die zum Öffnen des Gasventils erforderliche Spannung bereitgehalten wird, muss diese Zeit kürzer sein als die Entladezeit des Kondensators 33.By providing a signal at the input 13 of the control circuit 10 according to the invention in which the two frequency signals of approximately 1000 kHz and of approximately 5 kHz follow each other in a time-defined manner, a voltage required to open the gas valve can be permanently provided at the relay 11. In the period in which the first frequency signal of approximately 1000 kHz is present at the input 13, the capacitor 33 of the drive circuit 15 discharges, whereby the voltage required to open the gas valve is maintained at the relay. During the period at which the second frequency signal of approximately 5 kHz is present at the input 13 and the capacitor 16 of the charging circuit 14 discharges, the drive circuit 15 is conductive and at the connection point 31 is a rectangular 5 kHz signal. In this way, on the one hand via the diode 34, the capacitor 33 is charged, on the other hand, discharge takes place via the relay 11. During discharge, a DC current flows through the relay 11. During the application of the first frequency signal of about 1000 kHz, the transistor 25 is continuously conductive, whereby the voltage at the emitters of the Darlington transistor circuits 29 and 30 becomes high. Since, during the period in which the first frequency signal of approximately 1000 kHz is present at the input 13, the voltage required to open the gas valve is kept ready by discharging the capacitor 33 at the relay 11, this time must be shorter than the discharge time of the capacitor 33 ,

Die konkrete Auslegung der oben beschriebenen Steuerschaltung obliegt dem hier angesprochenen Fachmann. Im besonders bevorzugten Ausführungsbeispiel beträgt die Kapazität des Kondensators 16 der Ladeschaltung 10 µF, die Kapazität der Kondensatoren 20, 21, 22, 23 beträgt jeweils 100 pF. Die Kapazität des Kondensators 33 der Ansteuerschaltung beträgt bevorzugt 47 µF. Der Widerstand 19 wird vorzugsweise mit 1 kΩ, der Widerstand 28 mit 1 MΩ dimensioniert. Die Widerstand 26 beträgt vorzugsweise 47 kΩ, der Widerstand 27 100 kΩ. Der Widerstand 32 beträgt vorzugsweise 51 Ω. Die Versorgungsspannung V beträgt 24 V. Mit dieser Dimensionierung der Schaltung beträgt die Entladezeit des Kondensators 16 über den Widerstand 26 in etwa 116 ms, die Ladezeit desselben beträgt in etwa 40 ms.The specific design of the control circuit described above is incumbent on the person skilled in the art referred to here. In a particularly preferred embodiment, the capacitance of the capacitor 16 of the charging circuit 10 μF, the capacitance of the capacitors 20, 21, 22, 23 is 100 pF each. The capacitance of the capacitor 33 of the drive circuit is preferably 47 μF. The resistor 19 is preferably dimensioned with 1 kΩ, the resistor 28 with 1 MΩ. The resistor 26 is preferably 47 kΩ, the resistor 27 100 kΩ. The resistor 32 is preferably 51 Ω. The supply voltage V is 24 V. With this dimensioning of the circuit, the discharge time of the capacitor 16 via the resistor 26 in about 116 ms, the charging time of the same is about 40 ms.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Steuerschaltungcontrol circuit
1111
Relaisrelay
1212
Fail-Safe-SchaltungFail-safe circuit
1313
Eingangentrance
1414
Ladeschaltungcharging circuit
1515
Ansteuerschaltungdrive circuit
1616
Kondensatorcapacitor
1717
Diodediode
1818
Diodediode
1919
Widerstandresistance
2020
Kondensatorcapacitor
2121
Kondensatorcapacitor
2222
Kondensatorcapacitor
2323
Kondensatorcapacitor
2424
Transistortransistor
2525
Transistortransistor
2626
Widerstandresistance
2727
Widerstandresistance
2828
Widerstandresistance
2929
Darlington-TransistorschaltungDarlington transistor circuit
3030
Darlington-TransistorschaltungDarlington transistor circuit
3131
Verbindungspunktjunction
3232
Widerstandresistance
3333
Kondensatorcapacitor
3434
Diodediode

Claims (8)

Ansteuerschaltung (15) für ein Relais (11) eines relaisbetriebenen Gasventils, wobei das Relais (11) dem Öffnen und/oder Schließen des Gasventils dient, mit zwei Transistorschaltungen (29, 30), nämlich einer ersten NPN Transistorschaltung (29) und einer zweiten PNP Transistorschaltung (30), wobei die beiden Transistorschaltungen (29, 30) an ihren Basen miteinander verbunden und über ihre Basen an einen Kollektor eines weiteren Transistors (24) gekoppelt sind, dessen Kollektor unter Zwischenschaltung eines Widerstands (27) an einer Versorgungsspannung (V) angeschlossen ist, wobei die beiden Transistorschaltungen (29, 30) auch über ihrer Emitter miteinander verbunden sind, wobei ein Kollektor der ersten NPN Transistorschaltung (29) am Potential der Versorgungsspannung (V) und ein Kollektor der zweiten PNP Transistorschaltung (30) zusammen mit einem Emitter des weiteren Transistors (24) an Massepotential anliegt, und wobei das Relais (11) zusammen mit einer parallel zum Relais (11) geschalteten Diode (34) zwischen den Kollektor und den Emitter der ersten NPN Transistorschaltung (29) geschaltet ist.A control circuit (15) for a relay (11) of a relay-operated gas valve, the relay (11) serving to open and / or close the gas valve, comprising two transistor circuits (29, 30), namely a first NPN transistor circuit (29) and a second one PNP transistor circuit (30), wherein the two transistor circuits (29, 30) are interconnected at their bases and coupled via their bases to a collector of another transistor (24) whose collector with the interposition of a resistor (27) to a supply voltage (V ), wherein the two transistor circuits (29, 30) are also interconnected via their emitter, wherein a collector of the first NPN transistor circuit (29) at the potential of the supply voltage (V) and a collector of the second PNP transistor circuit (30) together with an emitter of the further transistor (24) is applied to ground potential, and wherein the relay (11) together with a parallel to the relay (11) switched diode (34) is connected between the collector and the emitter of the first NPN transistor circuit (29). Ansteuerschaltung nach Anspruch 1, dadurch gekennzeichnet, dass die Diode (34) mit ihrer Anode am Kollektor der ersten NPN Transistorschaltung (29) und mit ihrer Kathode an einem Kondensator (33) angreift, der in Reihe zur Parallelschaltung aus Relais (11) und Diode (34) zwischen den Kollektor und den Emitter der ersten NPN Transistorschaltung (29) geschaltet ist.Drive circuit according to Claim 1, characterized in that the diode (34) acts with its anode on the collector of the first NPN transistor circuit (29) and with its cathode on a capacitor (33) connected in series with the parallel circuit of relay (11) and diode (34) is connected between the collector and the emitter of the first NPN transistor circuit (29). Ansteuerschaltung nach Anspruch 2, dadurch gekennzeichnet, dass eine Serienschaltung aus dem Kondensator (33) und dem Widerstand (32) in Reihe zur Parallelschaltung aus Relais (11) und Diode (34) zwischen den Kollektor und den Emitter der ersten NPN Transistorschaltung (29) geschaltet ist.Drive circuit according to claim 2, characterized in that a series connection of the capacitor (33) and the resistor (32) in series with the parallel connection of relay (11) and diode (34) between the collector and the emitter of the first NPN transistor circuit (29) is switched. Ansteuerschaltung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass an einer Basis des weiteren Transistors (24) ein widerstand (26) angreift.Drive circuit according to one of claims 1 to 3, characterized in that a resistor (26) acts on a base of the further transistor (24). Ansteuerschaltung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der weitere Transistors (24) ein NPN Transistor ist.Drive circuit according to one of claims 1 to 4, characterized in that the further transistor (24) is an NPN transistor. Ansteuerschaltung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die zwei Transistorschaltungen (29, 30) als Darlington-Transistorschaltungen ausgebildet sind.Drive circuit according to one of claims 1 to 5, characterized in that the two transistor circuits (29, 30) are designed as Darlington transistor circuits. Ansteuerschaltung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass ein zweiter weiterer Transistor (25) derart mit dem ersten weiteren Transistor (24) verschaltet ist, dass ein Kollektor des zweiten weiteren Transistors (25) an die Basis des ersten weiteren Transistors (24) und ein Emitter des zweiten weiteren Transistors (25) an ein Massepotential angeschlossen ist.Drive circuit according to one of claims 1 to 6, characterized in that a second further transistor (25) is connected in such a way with the first further transistor (24), that a collector of the second further transistor (25) to the base of the first further transistor (25). 24) and an emitter of the second further transistor (25) is connected to a ground potential. Ansteuerschaltung nach Anspruch 7, dadurch gekennzeichnet, dass an einer Basis des zweiten Transistors (25) ein Widerstand (28) angreift.Drive circuit according to claim 7, characterized in that a resistor (28) acts on a base of the second transistor (25).
EP20100001080 2004-04-01 2005-03-17 Control circuit for a relay for relay-operated gas valves Active EP2180493B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102004016764A DE102004016764B3 (en) 2004-04-01 2004-04-01 Fail-safe circuit for gas valve, especially piezo-driven gas valve, uses fail-safe circuit for providing output voltage to open gas valve
DE200410045031 DE102004045031B4 (en) 2004-09-15 2004-09-15 Control circuit for relay-operated gas valves
EP20050716160 EP1730760B1 (en) 2004-04-01 2005-03-17 Control circuit for relay-operated gas valves

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EP20050716160 Division EP1730760B1 (en) 2004-04-01 2005-03-17 Control circuit for relay-operated gas valves
EP05716160.6 Division 2005-03-17

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EP2180493B1 EP2180493B1 (en) 2014-05-28

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EP1730760A1 (en) 2006-12-13
EP2180493B1 (en) 2014-05-28
US7586213B2 (en) 2009-09-08
EP1730760B1 (en) 2010-07-28
WO2005098888A1 (en) 2005-10-20
US20070159761A1 (en) 2007-07-12
ATE475981T1 (en) 2010-08-15

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