EP0855557A1 - Control circuit for a gas valve with monitoring of the combustion air supply - Google Patents
Control circuit for a gas valve with monitoring of the combustion air supply Download PDFInfo
- Publication number
- EP0855557A1 EP0855557A1 EP97100909A EP97100909A EP0855557A1 EP 0855557 A1 EP0855557 A1 EP 0855557A1 EP 97100909 A EP97100909 A EP 97100909A EP 97100909 A EP97100909 A EP 97100909A EP 0855557 A1 EP0855557 A1 EP 0855557A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- relay
- control circuit
- supply line
- charging
- resistor
- 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
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
- F23N5/203—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays using electronic means
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
- F23N2005/181—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of air
- F23N2005/182—Air flow switch
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2223/00—Signal processing; Details thereof
- F23N2223/22—Timing network
- F23N2223/26—Timing network with capacitors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2223/00—Signal processing; Details thereof
- F23N2223/22—Timing network
- F23N2223/28—Timing network with more than one timing element
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2233/00—Ventilators
- F23N2233/06—Ventilators at the air intake
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/12—Fuel valves
- F23N2235/14—Fuel valves electromagnetically operated
Definitions
- the invention relates to a control circuit for a gas valve with simultaneous monitoring the combustion air supply according to the preamble of claim 1, as from EP-0 698 767 B1 is known.
- the invention is particularly based on the self-monitoring of the Flow switch for the combustion air supply directed to ensure that this in the absence of air supply does not pretend the presence of air flow by being Make contact already at the beginning of the burner cycle, i.e. before the fan is switched on, closed is.
- the excitation current for a the is in EP 0 698 767 Gas valve switching relay supplied by a charging capacitor, which via a Normally open contact of the flow switch designed as a switch is charged.
- the present invention simplifies the control circuit mentioned achieved by self-monitoring no longer the presence of a flow switch in the form of a switch, but the flow switch as easier Working contact can be formed, which in the presence of a predetermined Minimum flow closes. This also allows the flow switch to be used Train electronic switch, which in the presence of air flow Excitation circuit for the gas valve closes and interrupts in the absence of air flow.
- the invention is characterized in claim 1. The fact that the supply terminal of Loading resistance when the flow switch is closed via this with the second AC supply line is connected directly or, for example, via a diode, cannot at the beginning of the burner cycle with the flow switch incorrectly closed Charging of the charging capacitor take place because of this via the flow switch is short-circuited. This also creates an inrush current for the relay prevented.
- the relay RY02 has a changeover contact Normally open contact NO2 and normally closed contact NC2, while the contact arm C2 on one Mains AC voltage line L is.
- the relay RY02 is equipped with an electronic switch, e.g. a transistor Q02, connected in series, the control electrode of the output A a control electronics CE is connected.
- a holding circuit with a diode D1 and A resistor R02 leads from the NO2 normally open contact to the excitation winding RY02 and via the electronic switch Q02 to the other mains voltage line N.
- the Series connection of relay RY02 and electronic switch Q02 is a charging capacitor C05 connected in parallel, its charging resistor R05 via the field winding of the gas valve PV and a series resistor R01 and the normally closed contact NC2 of the relay switch with the Supply line L is connected.
- the input E of the control electronics CE is to the assignment of the charging capacitor C05 facing away from the ground potential N, see that this control electronics CE the electronic switch Q02 by a signal on their Output A switches through as soon as the charging voltage at input E reaches a predetermined value Threshold exceeded.
- the charging resistor R05 and the series resistor R01 are like this dimensioned that of these two resistors and the field winding of the gas valve PV flowing charging current to the capacitor C05 is not sufficient to open the gas valve PV.
- connection point P1 of resistor R02, resistor R05, capacitor C05 and relay RY02 at input E of control electronics CE is the connection point P1 facing away from the charging resistor R05 in Figures 1 and 2 to the Connection line P2 connected between valve PV and flow switch PS.
- a charging circuit is created for the charging capacitor C05 the line L via the relay contact C2 / NC2, the resistor R01, the valve winding PV and the charging resistor R05.
- the negative half wave is over the Series connection of diode D11 and blower motor FA bypassed capacitor C05, because the resistance value of resistor R1 (e.g. 68 kOhm) is much higher than that Fan impedance (approximately 200 ohms).
- the thyristor TH1 is blocked because its cathode k via the fan winding FA is practically at the same potential as its Control electrode c.
- the flow switch PS would already be closed due to some fault Start of the burner cycle, i.e. closed before the fan FA started, the would called positive half-wave also short-circuited via the flow switch PS and the Capacitor C05 could not be charged. In this way the Functionality of the flow switch PS checked before each burner cycle.
- the flow switch PS detects a sufficient air flow, it closes its Contact C / NO.
- the flow switch PS detects a sufficient air flow, it closes its Contact C / NO.
- the flow switch PS flows to the other supply line N, generates the negative half-wave via the resistor R11 on the control electrode c des Thyristor TH1 a positive control current, so that the thyristor TH1 turns on and the Current path also for the negative half wave of the AC mains voltage via the valve winding PV closes.
- the circuit is thus in the normal operating state, in which the Fan motor FA is running and the gas valve PV is open. Motor FA and valve PV is closed by switching off the supply voltage to the Terminals L and N.
- a gas valve PV which has a Rectifier bridge circuit D11, D12, D13, D14 is excited with direct current. This is the make contact NO2 of the relay RY02 to the one input E1 and the line N to the other input E2 of the rectifier bridge connected.
- the valve PV and the Flow switches PS are in turn connected in series and here to the two outputs A1 and A2 of the rectifier bridge connected.
- the capacitor C05 is charged in the same way as in the previously described embodiment, the positive Half wave flows via NC2, R01, PV, R05 and P1 to capacitor C05, while the negative Half wave on the line L via the diode D11 and the fan winding FA none Charging current arises because the resistance of resistor R1 (e.g. 68kOhm) is essential is higher than the fan impedance of about 200 ohms. This predominates, as in Embodiment according to Figure 1, the charging current from the positive half wave to the negative Charging current is considerable.
- resistor R1 e.g. 68kOhm
- the relay RY02 responds as soon as, as described above, the charging voltage at input E exceeds the threshold and the control electronics CE turns on the transistor Q02.
- the control electronics CE turns on the transistor Q02.
- the AC input voltage is then applied to the Inputs E1 and E2 of the rectifier bridge and on the fan FA.
- the flow switch PS closes and connects it Gas valve with outputs A1 and A2 of the rectifier bridge circuit. The valve opens and the system runs in normal operation.
- the flow switch PS is not at the exit, but at the entrance of the rectifier bridge, namely between the input E2 and the Ground line N.
- the rectifier bridge can only supply a DC excitation current for deliver the valve PV when the flow switch PS is closed.
- One of the rectifiers the bridge circuit is a controlled rectifier, e.g. a thyristor TH1, the Control electrode g via a resistor R11, similar to that in Figure 1, to the Supply line N (ground) is connected.
- a positive charging current flows from line L to charge capacitor C05 R01, PV, D14 and R05 to the capacitor.
- the thyristor TH1 is blocked because of its cathode k is practically at the same potential as its via the fan winding FA Control electrode g.
- the negative half wave is from D11 and FA as well as PS from Capacitor kept away because the resistance of resistor R1 (e.g. 68 kOhm) is significantly higher than the impedance of the fan of approximately 200 ohms.
- the relay RY02 switches when the charging voltage of the capacitor reaches the threshold determined by CE exceeds.
- the flow switch PS detects a sufficient air flow, it closes its Contact C / NO.
- diode D11, valve winding PV, the diode D14 and the flow switch PS flows to the other supply line N, generates the negative half-wave via the resistor R11 on the control electrode g des Thyristor TH1 a positive control current, so that the thyristor TH1 turns on.
- the holding current for the relay RY02 arrives as in the previous exemplary embodiments of NO2 via D1 and R02 Relay.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
- Relay Circuits (AREA)
Abstract
Description
Die Erfindung betrifft eine Steuerschaltung für ein Gasventil bei gleichzeitiger Überwachung
der Verbrennungsluftzufuhr gemäß Oberbegriff des Anspruchs 1, wie diese aus
EP-0 698 767 B1 bekannt ist. Die Erfindung ist insbesondere auf die Eigenüberwachung des
Strömungsschalters für die Verbrennungsluftzufuhr gerichtet, um sicherzustellen, daß dieser
bei fehlender Luftzufuhr nicht das Vorhandensein einer Luftströmung vortäuscht, indem sein
Arbeitskontakt bereits zu Beginn des Brennerzyklus, also vor Einschaltung des Gebläses,
geschlossen ist. Um dies zu verhindern, wird in EP 0 698 767 der Erregerstrom für ein das
Gasventil einschaltendes Relais von einem Ladekondensator geliefert, welcher über einen
Ruhekontakt des als Umschalter ausgebildeten Strömungsschalters aufgeladen wird. Nur wenn
der Strömungsschalter anfänglich seine Ruhekontaktlage einnimmt und den Ladestromkreis für
den Ladekondensator schließt, wird dieser aufgeladen und kann beim Überschreiten einer
vorgegebenen Ladespannung über einen elektronischen Schalter an die Erregerwicklung des
Relais gelegt werden, um dieses zum Ansprechen zu bringen. Sollte der Umschaltkontakt des
Strömungsschalters zu Beginn des Brennerzyklus, also vor Einschaltung des Gebläses bereits
am Arbeitskontakt anliegen, beispielsweise weil er am Ende des vorherigen Brennerzyklus
infolge einer Störung nicht in die Ruhelage zurückgeschaltet hat, so bleibt der genannte
Ladestromkreis unterbrochen, so daß kein Erregerstrom für das Einschaltrelais des Gasventils
entstehen kann.The invention relates to a control circuit for a gas valve with simultaneous monitoring
the combustion air supply according to the preamble of
Mit der vorliegenden Erfindung wird eine Vereinfachung der genannten Steuerschaltung
erzielt, indem die Eigenüberwachung nicht mehr das Vorhandensein eines Strömungsschalters
in Form eines Umschalters erfordert, sondern der Strömungsschalter als einfacher
Arbeitskontakt ausgebildet sein kann, welcher bei Vorhandensein einer vorgegebenen
Mindestströmung schließt. Dies ermöglicht es zudem, den Strömungsschalter als
elektronischen Schalter auszubilden, der bei Vorhandensein der Luftströmung den
Erregerstromkreis für das Gasventil schließt und beim Fehlen der Luftströmung unterbricht.
Die Erfindung ist im Anspruch 1 gekennzeichnet. Dadurch, daß die Versorgungsklemme des
Ladewiderstands bei geschlossenem Strömungsschalter über diesen mit der zweiten
Wechselspannungszuleitung direkt oder beispeilweise über eine Diode in Verbindung steht,
kann zur Beginn des Brennerzyklus bei fälsclisch geschlossenem Strömungsschalter keine
Aufladung des Ladekondensators erfolgen, weil dieser über den Strömungsschalter
kurzgeschlossen ist. Damit wird zugleich die Erzeugung eines Einschaltstroms für das Relais
verhindert. Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen.The present invention simplifies the control circuit mentioned
achieved by self-monitoring no longer the presence of a flow switch
in the form of a switch, but the flow switch as easier
Working contact can be formed, which in the presence of a predetermined
Minimum flow closes. This also allows the flow switch to be used
Train electronic switch, which in the presence of air flow
Excitation circuit for the gas valve closes and interrupts in the absence of air flow.
The invention is characterized in
Die Erfindung wird nachfolgend anhand in den Zeichnungen wiedergegebener Ausführungsbeispiele erläutert. Darin zeigt:
Figur 1- eine Schaltungsanordnung für die Verwendung mit einem wechselstromerregten Gasmagnetventil,
- Figur 2
- eine Ausgestaltung der Steuerschaltung für die Speisung eines gleichstromerregten Gasmagnetventils über eine Diodenbrückenschaltung; und
- Figur 3
- eine Ausführungsform, bei der eine der Dioden der Brückenschaltung durch einen steuerbaren Gleichrichter, beispielsweise einen Thyristor, ersetzt ist.
- Figure 1
- a circuit arrangement for use with an AC-excited gas solenoid valve,
- Figure 2
- an embodiment of the control circuit for supplying a DC-excited gas solenoid valve via a diode bridge circuit; and
- Figure 3
- an embodiment in which one of the diodes of the bridge circuit is replaced by a controllable rectifier, for example a thyristor.
Die in den Zeichnungen verwendeten Bezugszeichen stimmen hinsichtlich der bereits in EP 0 698 767 B1 beschriebenen Bauteile mit den dortigen Bezugszeichen überein.The reference numerals used in the drawings are correct with regard to those already in FIGS Components described in EP 0 698 767 B1 match the reference numerals there.
In allen drei Ausführungsformen hat das Relais RY02 einen Umschaltkontakt mit Arbeitskontakt NO2 und Ruhekontakt NC2, während der Kontaktarm C2 an der einen Netzwechselspannungsleitung L liegt. Das Relais RY02 ist mit einem elektronischen Schalter, z.B. einem Transistor Q02, in Reihe geschaltet, dessen Steuerelektrode an den Ausgang A einer Steuerelektronik CE angeschlossen ist. Ein Haltestromkreis mit einer Diode D1 und einem Widerstand R02 führt vom Arbeitskontakt NO2 des Relais zu dessen Erregerwicklung RY02 und über den elektronischen Schalter Q02 zur anderen Netzspannungsleitung N. Der Reihenschaltung von Relais RY02 und elektronischem Schalter Q02 ist ein Ladekondensator C05 parallelgeschaltet, dessen Ladewiderstand R05 über die Erregerwicklung des Gasventils PV und einen Vorwiderstand R01 sowie den Ruhekontakt NC2 des Relaisumschalters mit der Versorgungsleitung L in Verbindung steht. Der Eingang E der Steuerelektronik CE ist an die dem Massepotential N abgewandte Belegung des Ladekondensators C05 angeschlossen, so daß diese Steuerelektronik CE den elektronischen Schalter Q02 durch ein Signal an ihrem Ausgang A durchschaltet, sobald die Ladespannung am Eingang E einen vorgegebenen Schwellwert überschreitet. Der Ladewiderstand R05 und der Vorwiderstand R01 sind so bemessen, daß der über diese beiden Widerstände und die Erregerwicklung des Gasventils PV fließenden Ladestrom zum Kondensator C05 nicht ausreicht, um das Gasventil PV zu öffnen.In all three embodiments, the relay RY02 has a changeover contact Normally open contact NO2 and normally closed contact NC2, while the contact arm C2 on one Mains AC voltage line L is. The relay RY02 is equipped with an electronic switch, e.g. a transistor Q02, connected in series, the control electrode of the output A a control electronics CE is connected. A holding circuit with a diode D1 and A resistor R02 leads from the NO2 normally open contact to the excitation winding RY02 and via the electronic switch Q02 to the other mains voltage line N. The Series connection of relay RY02 and electronic switch Q02 is a charging capacitor C05 connected in parallel, its charging resistor R05 via the field winding of the gas valve PV and a series resistor R01 and the normally closed contact NC2 of the relay switch with the Supply line L is connected. The input E of the control electronics CE is to the assignment of the charging capacitor C05 facing away from the ground potential N, see that this control electronics CE the electronic switch Q02 by a signal on their Output A switches through as soon as the charging voltage at input E reaches a predetermined value Threshold exceeded. The charging resistor R05 and the series resistor R01 are like this dimensioned that of these two resistors and the field winding of the gas valve PV flowing charging current to the capacitor C05 is not sufficient to open the gas valve PV.
Während der Verbindungspunkt P1 von Widerstand R02, Widerstand R05, Kondensator C05 und Relais RY02 am Eingang E der Steuerelektronik CE liegt, ist die dem Verbindungspunkt P1 abgewandte Klemme des Ladewiderstands R05 in den Figuren 1 und 2 an die Verbindungsleitung P2 zwischen Ventil PV und Strömungsschalter PS angeschlossen. Damit entsteht bei beiden Ausführungsformen für den Ladekondensator C05 ein Ladestromkreis von der Leitung L über den Relaiskontakt C2/NC2, den Widerstand R01, die Ventilwicklung PV und den Ladewiderstand R05.During the connection point P1 of resistor R02, resistor R05, capacitor C05 and relay RY02 at input E of control electronics CE is the connection point P1 facing away from the charging resistor R05 in Figures 1 and 2 to the Connection line P2 connected between valve PV and flow switch PS. In order to In both embodiments, a charging circuit is created for the charging capacitor C05 the line L via the relay contact C2 / NC2, the resistor R01, the valve winding PV and the charging resistor R05.
Bei der Wechselstromausführung gemäß Figur 1 ist zwischen den Ruhekontakt NO2 des Relais und die Erregerwicklung PV des Ventils die Antiparallelschaltung zweier Gleichrichter D11 und TH1 eingeschaltet, wobei der letztgenannte Gleichrichter TH1 ein gesteuerter Gleichrichter, z.B. ein Thyristor ist, dessen Steuerelektrode über einen Widerstand R11 an die andere Netzleitung N, z.B. Masse, angeschlossen ist. Dies führt zu folgender Arbeitsweise: Wird eine Wechselspannung an die Versorgungsklemmen L und N gelegt, so lädt eine an der Leitung L stehende positive Halbwelle den Kondensator C05 über den genannten Ladestromkreis NC2, R01, PV, R05, P1 auf. Die negative Halbwelle hingegen wird über die Reihenschaltung von Diode D11 und Gebläsemotor FA am Kondensator C05 vorbeigeleitet, weil der Widerstandswert des Widerstandes R1 (z.B. 68 kOhm) wesentlich höher ist als die Impedanz des Gebläses (etwa 200 Ohm). Der Thyristor TH1 ist gesperrt, weil seine Kathode k über die Gebläsewicklung FA praktisch auf dem gleichen Potential liegt wie seine Steuerelektrode c. Wäre aufgrund irgendeines Fehlers der Strömungsschalter PS bereits zu Anfang des Brennerzyklus, d.h. vor Anlaufen des Gebläses FA geschlossen, so würde die genannte positive Halbwelle über den Strömungsschalter PS ebenfalls kurzgeschlossen und der Kondensator C05 könnte nicht aufgeladen werden. Auf diese Weise wird die Funktionsfähigkeit des Strömungsschalters PS vor jedem Brennerzyklus überprüft.In the AC version according to FIG. 1 there is NO2 of the relay between the normally closed contact and the field winding PV of the valve, the anti-parallel connection of two rectifiers D11 and TH1 turned on, the latter rectifier TH1 being a controlled one Rectifiers, e.g. is a thyristor, the control electrode via a resistor R11 to the other power line N, e.g. Ground, is connected. This leads to the following way of working: If an AC voltage is applied to the supply terminals L and N, one charges at the Line L standing positive half-wave capacitor C05 over the above Charging circuit NC2, R01, PV, R05, P1 on. The negative half wave, however, is over the Series connection of diode D11 and blower motor FA bypassed capacitor C05, because the resistance value of resistor R1 (e.g. 68 kOhm) is much higher than that Fan impedance (approximately 200 ohms). The thyristor TH1 is blocked because its cathode k via the fan winding FA is practically at the same potential as its Control electrode c. The flow switch PS would already be closed due to some fault Start of the burner cycle, i.e. closed before the fan FA started, the would called positive half-wave also short-circuited via the flow switch PS and the Capacitor C05 could not be charged. In this way the Functionality of the flow switch PS checked before each burner cycle.
Ist der Strömungsschalter hingegen ordnungsgemäß geöffnet, so fließt der genannte Ladestrom und lädt den Kondensator C05 solange positiv auf, bis dessen Spannung am Eingang E der Steuerelektronik CE einen durch diese vorgegebenen Schwellwert überschreitet. Damit erscheint am Ausgang A der Steuerelektronik CE ein Schaltsignal, welches den Transistor Q02 durchschaltet. Damit kann sich der Kondensator C05 über das Relais RY02 und den genannten elektronischen Schalter Q02 entladen und damit das Relais RY02 zum Ansprechen bringen. Dieses schaltet seinen Kontakt C2 vom Ruhekontakt NC2 auf den Arbeitskontakt NO2 um, so daß das Verbrennungsluftgebläse FA anläuft.On the other hand, if the flow switch is opened properly, the charging current mentioned flows and charges capacitor C05 positively until its voltage at input E Control electronics CE exceeds a predetermined threshold value. In order to a switching signal appears at output A of control electronics CE, which switches transistor Q02 switches through. This allows capacitor C05 to connect via relay RY02 and the above Discharge electronic switch Q02 and thus trigger relay RY02. This switches its contact C2 from the normally closed contact NC2 to the normally open contact NO2, see above that the combustion air fan FA starts.
Sobald der Strömungsschalter PS eine ausreichende Luftströmung feststellt, schließt er seinen Kontakt C/NO. Während die positive Halbwelle der Versorgungsspannung an der Leitung L nunmehr unmittelbar über den Arbeitskontakt NO2 und die Diode D11 über die Ventilwicklung PV und den Strömungsschalter PS zur anderen Versorgungsleitung N fließt, erzeugt die negative Halbwelle über den Widerstand R11 an der Steuerelektrode c des Thyristors TH1 einen positiven Steuerstrom, so daß der Thyristor TH1 durchschaltet und den Stromweg auch für die negative Halbwelle der Netzwechselspannung über die Ventilwicklung PV schließt. Damit befindet sich die Schaltung im normalen Betriebszustand, bei dem der Gebläsemotor FA läuft und das Gasventil PV geöffnet ist. Eine Stillegung von Motor FA und ein Schließen von Ventil PV erfolgt durch Abschalten der Versorungsspannung an den Klemmen L und N.As soon as the flow switch PS detects a sufficient air flow, it closes its Contact C / NO. During the positive half wave of the supply voltage on line L now directly via the NO2 contact and the diode D11 via the Valve winding PV and the flow switch PS flows to the other supply line N, generates the negative half-wave via the resistor R11 on the control electrode c des Thyristor TH1 a positive control current, so that the thyristor TH1 turns on and the Current path also for the negative half wave of the AC mains voltage via the valve winding PV closes. The circuit is thus in the normal operating state, in which the Fan motor FA is running and the gas valve PV is open. Motor FA and valve PV is closed by switching off the supply voltage to the Terminals L and N.
In der Ausführungsform nach Figur 2 findet ein Gasventil PV Anwendung, welches über eine Gleichrichterbrückenschaltung D11, D12, D13, D14 mit Gleichstrom erregt wird. Hierzu ist der Arbeitskontakt NO2 des Relais RY02 an den einen Eingang E1 und die Leitung N an den anderen Eingang E2 der Gleichrichterbrücke angeschlossen. Das Ventil PV und der Strömungsschalter PS sind wiederum in Reihe geschaltet und hier an die beiden Ausgänge A1 und A2 der Gleichrichterbrücke angeschlossen. Die Aufladung des Kondensators C05 erfolgt in der gleichen Weise wie beim zuvorbeschriebenen Ausführungsbeispiel, wobei die positive Halbwelle über NC2, R01, PV, R05 und P1 zum Kondensator C05 fließt, während die negative Halbwelle an der Leitung L über die Diode D11 und die Gebläsewicklung FA keinen Ladestrom entstehen läßt, weil der Widerstand des Widerstands R1 (z.B. 68kOhm) wesentlich höher ist als die Impedanz des Gebläses von etwa 200 Ohm. Damit überwiegt, wie im Ausführungsbeispiel nach Figur 1, der Ladestrom aus der positiven Halbwelle den negativen Ladestrom beträchtlich.In the embodiment according to FIG. 2, a gas valve PV is used, which has a Rectifier bridge circuit D11, D12, D13, D14 is excited with direct current. This is the make contact NO2 of the relay RY02 to the one input E1 and the line N to the other input E2 of the rectifier bridge connected. The valve PV and the Flow switches PS are in turn connected in series and here to the two outputs A1 and A2 of the rectifier bridge connected. The capacitor C05 is charged in the same way as in the previously described embodiment, the positive Half wave flows via NC2, R01, PV, R05 and P1 to capacitor C05, while the negative Half wave on the line L via the diode D11 and the fan winding FA none Charging current arises because the resistance of resistor R1 (e.g. 68kOhm) is essential is higher than the fan impedance of about 200 ohms. This predominates, as in Embodiment according to Figure 1, the charging current from the positive half wave to the negative Charging current is considerable.
Das Relais RY02 spricht an, sobald, wie oben beschrieben, die Ladespannung am Eingang E den Schwellwert überschreitet und die Steuerelektronik CE den Transistor Q02 durchschaltet. Mit dem Umschalten des Relaiskontakts C2 liegt dann die Eingangswechselspannung an den Eingängen E1 und E2 der Gleichrichterbrücke sowie am Gebläse FA. Sobald dieses einen hinreichenden Luftstrom erzeugt, schließt der Strömungsschalter PS und verbindet damit das Gasventil mit den Ausgängen A1 und A2 der Gleichrichterbrückenschaltung. Das Ventil öffnet und die Anlage läuft im Normalbetrieb.The relay RY02 responds as soon as, as described above, the charging voltage at input E exceeds the threshold and the control electronics CE turns on the transistor Q02. When the relay contact C2 is switched, the AC input voltage is then applied to the Inputs E1 and E2 of the rectifier bridge and on the fan FA. Once this one generates sufficient air flow, the flow switch PS closes and connects it Gas valve with outputs A1 and A2 of the rectifier bridge circuit. The valve opens and the system runs in normal operation.
Bei der Ausführungsform nach Figur 3 liegt der Strömungsschalter PS nicht am Ausgang, sondern am Eingang der Gleichrichterbrücke, nämlich zwischen dem Eingang E2 und der Masseleitung N. Folglich kann die Gleichrichterbrücke nur dann einen Erregergleichstrom für das Ventil PV liefern, wenn der Strömungsschalter PS geschlossen ist. Einer der Gleichrichter der Brückenschaltung ist ein gesteuerter Gleichrichter, z.B. ein Thyristor TH1, dessen Steuerelektrode g über einen Widerstand R11, ähnlich wie in Figur 1, an die Versorgungsleitung N (Masse) angeschlossen ist.In the embodiment according to FIG. 3, the flow switch PS is not at the exit, but at the entrance of the rectifier bridge, namely between the input E2 and the Ground line N. As a result, the rectifier bridge can only supply a DC excitation current for deliver the valve PV when the flow switch PS is closed. One of the rectifiers the bridge circuit is a controlled rectifier, e.g. a thyristor TH1, the Control electrode g via a resistor R11, similar to that in Figure 1, to the Supply line N (ground) is connected.
Zur Aufladung des Kondensators C05 fließt ein positiver Ladestrom von der Leitung L über R01, PV, D14 und R05 zum Kondensator. Der Thyristor TH1 ist gesperrt, weil seine Kathode k über die Gebläsewicklung FA praktisch auf dem gleichen Potential liegt wie seine Steuerelektrode g. Die negative Halbwelle wird durch D11 und FA sowie PS vom Kondensator ferngehalten, weil der Widerstand des Widerstandes R1 (z.B. 68 kOhm) wesentlich höher ist als die Impedanz des Gebläses von etwa 200 Ohm. Das Relais RY02 schaltet um, wenn die Ladespannung des Kondensators den durch CE bestimmten Schwellwert überschreitet. Dann liegt die Wechselstrom-Versorgungsleitung L über N02 am Eingang E1 und die Leitung N über PS am Eingang E2 der Gleichrichterbrücke D11, D12, D14, TH1, welche den Erregerstrom für das Ventil PV liefert. Sollte aufgrund eines Fehlers der Strömungsschalter PS bereits ohne Einschaltung des Gebläses FA geschlossen sein, so könnte sich keine Ladespannung am Kondensator C05 aufbauen und somit das Relais RY02 nicht ansprechen. Auch diese Schaltung ist somit gegen einen Fehler im Strömungsschalter PS gesichert.A positive charging current flows from line L to charge capacitor C05 R01, PV, D14 and R05 to the capacitor. The thyristor TH1 is blocked because of its cathode k is practically at the same potential as its via the fan winding FA Control electrode g. The negative half wave is from D11 and FA as well as PS from Capacitor kept away because the resistance of resistor R1 (e.g. 68 kOhm) is significantly higher than the impedance of the fan of approximately 200 ohms. The relay RY02 switches when the charging voltage of the capacitor reaches the threshold determined by CE exceeds. Then the AC supply line L is connected to input E1 via N02 and line N via PS at input E2 of rectifier bridge D11, D12, D14, TH1, which supplies the excitation current for the valve PV. Should the Flow switch PS can already be closed without switching on the fan FA, so it could no charging voltage builds up on capacitor C05 and therefore relay RY02 does not speak to. This circuit is therefore also against a fault in the flow switch PS secured.
Sobald der Strömungsschalter PS eine ausreichende Luftströmung feststellt, schließt er seinen Kontakt C/NO. Während die positive Halbwelle der Versorgungsspannung an der Leitung L nunmehr unmittelbar über den Arbeitskontakt NO2, die Diode D11, die Ventilwicklung PV, die Diode D14 und den Strömungsschalter PS zur anderen Versorgungsleitung N fließt, erzeugt die negative Halbwelle über den Widerstand R11 an der Steuerelektrode g des Thyristors TH1 einen positiven Steuerstrom, so daß der Thyristor TH1 durchschaltet. Damit fließt die negative Halbwelle der Versorgungsspannung von der Leitung N über PS, D12, PV, N über PS, D12, PV, TH1 und E1 sowie NO2 zur Leitung L. Der Haltestrom für das Relais RY02 gelangt wie bei den vorherigen Ausführungsbeispielen von NO2 über D1 und R02 zum Relais.As soon as the flow switch PS detects a sufficient air flow, it closes its Contact C / NO. During the positive half wave of the supply voltage on line L now directly via NO2, diode D11, valve winding PV, the diode D14 and the flow switch PS flows to the other supply line N, generates the negative half-wave via the resistor R11 on the control electrode g des Thyristor TH1 a positive control current, so that the thyristor TH1 turns on. In order to the negative half wave of the supply voltage flows from line N via PS, D12, PV, N via PS, D12, PV, TH1 and E1 and NO2 to line L. The holding current for the relay RY02 arrives as in the previous exemplary embodiments of NO2 via D1 and R02 Relay.
Während in EP 0 698 767 der Strömungsschalter über seinen Umschalt-Ruhekontakt den Ladestromkreis für den Ladekondensator herstellt, dessen Ladepotential über eine Steuerelektronik das Relais zum Ansprechen bringt, ist allen drei Ausführungsformen der vorliegenden Erfindung gemeinsam, daß ein solcher zusätzlicher Ruhekontakt des Strömungsschalters nicht erforderlich ist und der Strömungsschalter, falls er aufgrund eines Fehlers bereits vor dem Anlaufen des Gebläses geschlossen sein sollte, die Aufladung des Ladekondensators verhindert, weil er der Reihenschaltung von Ladekondensator und Ladewiderstand parallelgeschaltet ist.While in EP 0 698 767 the flow switch via the changeover normally closed contact Establishes charging circuit for the charging capacitor, the charging potential via a Control electronics that trigger the relay is all three embodiments of the present invention in common that such additional break contact of the Flow switch is not required and the flow switch if it is due to a Error should be closed before the blower starts, charging the Prevents charging capacitor because it is the series connection of charging capacitor and Charging resistor is connected in parallel.
Claims (10)
dadurch gekennzeichnet, daß die dem Ladekondensator (C05) abgewandte Klemme des Ladewiderstands (R05) über den als Arbeitskontakt (C, NO) ausgebildeten Strömungsschalter (PS) mit der anderen Wechselstromversorgungsleitung (N) in Verbindung steht.
characterized in that the terminal of the charging resistor (R05) facing away from the charging capacitor (C05) is connected to the other AC supply line (N) via the flow switch (PS) designed as a normally open contact (C, NO).
dadurch gekennzeichnet, daß der Ladewiderstand (R05) mit seiner dem Verbindungspunkt (P1) von Ladekondensator und Relaiswicklung abgewandten Anschlußklemme an die Verbindungsleitung (P2) von Ventilerregerspule (PV) und Strömungsschalter (PS) angeschlossen ist (Fig. 1 und 2).Control circuit according to one of Claims 1 to 3, with an electronic switch (Q02) connected in series with the relay winding (RY02), this series connection (RY02, Q02) being connected in parallel with the charging capacitor (C05),
characterized in that the charging resistor (R05) with its connection terminal (P1) facing away from the charging capacitor and relay winding is connected to the connecting line (P2) of the valve excitation coil (PV) and flow switch (PS) (FIGS. 1 and 2).
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE59700550T DE59700550D1 (en) | 1997-01-22 | 1997-01-22 | Control circuit for gas valve with monitoring of the combustion air supply |
EP97100909A EP0855557B1 (en) | 1997-01-22 | 1997-01-22 | Control circuit for a gas valve with monitoring of the combustion air supply |
CZ19987590U CZ7416U1 (en) | 1997-01-22 | 1998-01-22 | Control circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97100909A EP0855557B1 (en) | 1997-01-22 | 1997-01-22 | Control circuit for a gas valve with monitoring of the combustion air supply |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0855557A1 true EP0855557A1 (en) | 1998-07-29 |
EP0855557B1 EP0855557B1 (en) | 1999-10-13 |
Family
ID=8226389
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97100909A Expired - Lifetime EP0855557B1 (en) | 1997-01-22 | 1997-01-22 | Control circuit for a gas valve with monitoring of the combustion air supply |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0855557B1 (en) |
CZ (1) | CZ7416U1 (en) |
DE (1) | DE59700550D1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1126219A1 (en) * | 2000-02-11 | 2001-08-22 | Honeywell B.V. | Control circuit |
EP1182402A1 (en) * | 2000-08-25 | 2002-02-27 | Honeywell B.V. | Control circuit |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2220313T3 (en) | 2000-10-06 | 2004-12-16 | Honeywell B.V. | CONTROL CIRCUIT. |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4403942A (en) * | 1980-11-18 | 1983-09-13 | Carrier Corporation | Self-checking safety switch control circuit |
US5074780A (en) * | 1988-09-01 | 1991-12-24 | Honeywell, Inc. | Control system for forced combustion air heating appliance |
EP0480312A1 (en) * | 1990-10-10 | 1992-04-15 | Honeywell B.V. | Air flow monitor device for burners |
EP0698767A1 (en) * | 1994-08-24 | 1996-02-28 | Honeywell B.V. | Control circuit for a gas burner with monitoring of the combustion air supply |
-
1997
- 1997-01-22 EP EP97100909A patent/EP0855557B1/en not_active Expired - Lifetime
- 1997-01-22 DE DE59700550T patent/DE59700550D1/en not_active Expired - Fee Related
-
1998
- 1998-01-22 CZ CZ19987590U patent/CZ7416U1/en active Protection Beyond IP Right Term
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4403942A (en) * | 1980-11-18 | 1983-09-13 | Carrier Corporation | Self-checking safety switch control circuit |
US5074780A (en) * | 1988-09-01 | 1991-12-24 | Honeywell, Inc. | Control system for forced combustion air heating appliance |
EP0480312A1 (en) * | 1990-10-10 | 1992-04-15 | Honeywell B.V. | Air flow monitor device for burners |
EP0698767A1 (en) * | 1994-08-24 | 1996-02-28 | Honeywell B.V. | Control circuit for a gas burner with monitoring of the combustion air supply |
EP0698767B1 (en) | 1994-08-24 | 1996-10-30 | Honeywell B.V. | Control circuit for a gas burner with monitoring of the combustion air supply |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1126219A1 (en) * | 2000-02-11 | 2001-08-22 | Honeywell B.V. | Control circuit |
EP1182402A1 (en) * | 2000-08-25 | 2002-02-27 | Honeywell B.V. | Control circuit |
Also Published As
Publication number | Publication date |
---|---|
EP0855557B1 (en) | 1999-10-13 |
CZ7416U1 (en) | 1998-06-01 |
DE59700550D1 (en) | 1999-11-18 |
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