EP0533961B1 - Circuit de commande pour brûleur à gaz - Google Patents

Circuit de commande pour brûleur à gaz Download PDF

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Publication number
EP0533961B1
EP0533961B1 EP91112860A EP91112860A EP0533961B1 EP 0533961 B1 EP0533961 B1 EP 0533961B1 EP 91112860 A EP91112860 A EP 91112860A EP 91112860 A EP91112860 A EP 91112860A EP 0533961 B1 EP0533961 B1 EP 0533961B1
Authority
EP
European Patent Office
Prior art keywords
relay
switch
flame
voltage
operational amplifier
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.)
Expired - Lifetime
Application number
EP91112860A
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German (de)
English (en)
Other versions
EP0533961A1 (fr
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.)
Honeywell BV
Original Assignee
Honeywell BV
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Filing date
Publication date
Application filed by Honeywell BV filed Critical Honeywell BV
Priority to DE9191112860T priority Critical patent/DE59100193D1/de
Priority to EP91112860A priority patent/EP0533961B1/fr
Publication of EP0533961A1 publication Critical patent/EP0533961A1/fr
Application granted granted Critical
Publication of EP0533961B1 publication Critical patent/EP0533961B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/04—Prepurge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/36—Spark ignition, e.g. by means of a high voltage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • 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
    • 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

Definitions

  • the invention relates to a control circuit for gas burners fed from an AC voltage source, preferably from the mains AC voltage.
  • a control circuit of this type corresponding to the preamble of claim 1 is described in the older European patent application 90 105 518.6 dated March 23, 1990 and published as EP-A 0 440 872 on August 14, 1991.
  • the primary object of the present invention is to check that the flame sensor is working properly before starting a burner cycle.
  • the operation of the control circuit should be improved and made even more reliable.
  • the invention characterized in claim 1 serves to solve these problems.
  • the flame sensor is then checked to determine whether it is already supplying an output signal before the gas valve is opened, thus pretending that a flame is present. If this is the case, the control circuit goes into the locked state and is not able to open the gas valve.
  • Advantageous embodiments of the invention result from the subclaims.
  • the circuit arrangement is operated with alternating voltage, for which purpose for example the mains alternating voltage of 220 V is connected between the line terminal L and ground N.
  • the capacitor C2 is charged via the resistor R13 and the diode D8 as well as the field windings of the switch-on relay GR and the safety relay SR.
  • the voltage across the capacitor C4 connected to the capacitor C2 via the blocking diode D4 also rises, ie at the circuit point P3.
  • the charging current for the capacitor C2 is not sufficient to trigger one of the two relays GR or SR. Rather, it is necessary for the reset switch RS to be actuated briefly by hand after the capacitor C2 has been charged. Thus, a discharge circuit for the capacitor C2 is briefly closed via the series connection of relay winding SR and diode D9, so that an increased current flows through this relay. It triggers the relay. The changeover contact sr of the bistable safety relay SR thus switches from the normally closed contact s1 to the normally open contact s2.
  • the capacitor C4 has a significantly lower capacitance of, for example, 0.47 ⁇ F than the capacitor C2 with, for example, 47 ⁇ F.
  • the capacitor C4 is connected in parallel from the connection point P3 to ground with a voltage divider with the resistors R7, R8 and R11.
  • the voltage on capacitor C4 increases, the voltage on the non-inverting input (+) of the operational amplifier OP also increases.
  • a smoothing capacitor C5 of, for example, 0.1 ⁇ F.
  • the charging of the capacitors C2 and C4 starting with the switching of the flow switch contact pr via the series connection of resistor R1 and diode D1 and the two excitation windings GR and SR sets the pre-purging period of the burner in motion.
  • the duration of this pre-rinse period is essentially determined by the capacitor C4.
  • the Operational amplifier OP has a positive switching signal at its output.
  • the holding current for the switch-on relay GR is supplied by the diode D3 connected to the line L1 via the resistor R2 and flows via the zener diode ZD1 and the winding of the relay GR and the transistor T2 to ground.
  • the current over the Winding of relay GR is smoothed by capacitor C3.
  • the capacitor C1 for example 47 ⁇ F, is charged to the voltage at the Zener diode ZD1.
  • the output FO of the flame sensor FS switches to a voltage of, for example, + 22V and switches the transistor T3 through via the resistor R15 and the diode D5.
  • the flame relay FR responds, its contact fr switches from normally closed contact f1 to normally open contact f2.
  • the ignition transformer ZT is thus switched off.
  • a 50 Hz half-wave voltage reaches the connection point P4 of the two voltage divider resistors R8 and R11 via the diode D7 and the resistor R12.
  • This pulsating voltage is smoothed by the capacitor C5 and generates a positive voltage at the connection point P6 compared to the connection point P8, so that the operational amplifier OP maintains its output signal of, for example, + 20V.
  • the transistor T2 remains switched on as long as the flame sensor FS reports the presence of a flame.
  • the capacitor C5 is monitored in such a way that, if it were missing, the output of the operational amplifier would switch over in a 50 Hz rhythm, which, as mentioned above, would result in the safety relay SR being switched off to the safety position.
  • the flame sensor FS simulates the presence of a flame before switching on or during the pre-purge period and supplies an output signal of, for example, + 20V at the output FO
  • the transistor T1 could not switch on.
  • the voltage at connection point P7 which drops from + 15V to + 6V during normal operation, would not drop. Since this voltage drop occurs during the safety period, this would result in a safety period of practically zero.
  • the flame relay FR cannot respond, however, because the transistor T3 is continuously switched on by the output signal of the flame sensor FS and therefore the capacitor C1 cannot charge.
  • the current flowing through the flame relay FR and the transistor T3 is sufficient to hold the relay, but is too low as a response current.
  • the connection point P4 on the voltage divider R8, R11 does not receive a pulsating 50 Hz voltage. This means that the positive voltage required for normal operation at the non-inverting input (+) of the operational amplifier OP compared to the inverting input is missing. As the safety period is practically zero, as explained above, the safety relay SR is switched off immediately after the pre-purge time.
  • Figure 2 shows various current and voltage profiles during normal operation, namely the current I GR through the switch-on relay GR, the current I SR in the safety relay SR, the voltage V OP at the output of the operational amplifier OP, the voltage V P3 at the switching point P3, the voltage V. FO at the output of the flame sensor FS, as well as the duty cycle Z of the spark igniter and V of the gas valve.
  • a low holding current I GR I SR first flows through the windings of the switch-on relay GR and the safety relay SR, the safety relay already being in the switch-on position. This current charges the capacitor C2, causing the voltage V P2 and with it the voltage at point P3 to rise.
  • the operational amplifier switches through and delivers an output signal of approximately + 20V from time t1. This switches on the transistor T2, so that the capacitor C3 discharges via the switch-on relay GR and triggers it. The switching position of the SR safety relay does not change.
  • the pre-rinsing period VSP ends and the safety period SP begins.
  • the flame relay FR is activated in the manner described above. It switches off with its contact for the ignition spark source ZT at time t2. From the normally open contact f2, a 50 Hz half-wave voltage reaches the connection point P4 of the two voltage divider resistors R8 and R11 via the diode D7 and the resistor R12. This pulsating voltage is smoothed by the capacitor C5 and generates a positive voltage at the connection point P6 compared to the connection point P8, so that the operational amplifier OP maintains its output signal of, for example, + 20V.
  • the transistor T2 remains switched on as long as the flame sensor FS reports the presence of a flame. The system is now in the normal operating state. It ends as soon as the thermostat contact TH no longer requests heat and opens.
  • the safety period SP ends as soon as at time t3 the voltage at point P6 falls below the voltage at point P8 due to the discharge of capacitor C4 via resistors R7, R8 and R11.
  • the output voltage of the operational amplifier OP thus disappears, so that the transistor T2 blocks and the holding current for the switch-on relay GR now flows via the safety relay SR.
  • the safety relay SR thus switches to its safety position, in which the contact sr is applied to the normally closed contact s1.
  • FIG. 3 shows some curves for the case in which the flame sensor detects the presence of a flame before the gas valve is switched on or during the pre-purge period pretends and delivers an output signal V FO .
  • the currents I GR and I SR through the switch-on relay GR and the flame relay SR in turn have a value which is not sufficient to trigger the flame relay.
  • the voltage at point P3 in turn increases with the charging of capacitors C2 and C4 and reaches the value required for switching through operational amplifier OP at time t1. In the manner described, the capacitor C2 is discharged via the switch-on relay GR and triggers it. Since transistor T1 remains blocked due to the output signal of flame sensor FS, the voltage at node P7 does not drop.
  • the capacitor C5 is important. Without it, the time in which the voltage at point P6 is higher than at point P8, and thus the time in which transistor T2 is conductive, would be too short to trigger the switch-on relay GR.
  • the capacitor produces an overshoot for the duration from t1 to t4.
  • the reason for this is a second order RC element consisting of R1, C2 + C4, (R7 / R8) + R9, C5.
  • the 50 Hz half-wave voltage generated by the resistor R1 and the diode D1 acts like a unit jump for this second-order RC element, which results in the overshoot mentioned.

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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)

Claims (6)

  1. Un circuit de commande, alimenté à partir d'une source de tension alternative, de préférence la tension alternative du réseau , pour un brûleur à gaz, alimenté en gaz par l'intermédiaire d'une électrovanne, présentant un allumeur à étincelles électrique , ainsi qu'une sonde de flamme, dans lequel :
    a) un premier condensateur de charge (C2) est susceptible d'être chargé, par l'intermédiaire d'une diode redresseuse (D1) et du circuit en série du bobinage excitateur d'un relais de mise en service (GR) , destiné à l'électrovanne V et d'un relais de sécurité bistable (SR), depuis la source de tension alternative ( L, N) , sans devoir alors faire réagir les relais ;
    b) un premier interrupteur électronique (T2) est branché à la masse (N) depuis un premier point de liaison (P1) des deux bobinages excitateurs (GR, SR) ;
    c) le premier interrupteur électronique (T2) devient traversant lorsqu'est atteinte une valeur prédéterminée de la tension au premier condensateur de charge (C2) et fait réagir le relais de mise en circuit (GR);
    d) le premier interrupteur électronique (T2) redevient bloqué lors de l'écoulement d'une période de sécurité déterminée par un circuit temporisateur (C4, R7, R8, OP);
    e) le circuit temporisateur présente un deuxième condensateur de charge (C4) susceptible d'être chargé à partir du premier condensateur de charge (C2) ainsi qu'un amplificateur opérationnel (OP) , à une entrée (-) duquel est amené un potentiel prédéterminé et dont l'autre entrée (+) est raccordée au deuxième condensateur de charge (C4); et
    f) un deuxième interrupteur électronique (T1) est raccordé avec une de ses électrodes à une sortie (FO) de la sonde de flamme (FS), délivrant une tension lorsque est détectée une flamme;
    caractérisé en ce que
    g) la sortie (FO) de la sonde de flamme (FS) est en outre raccordée à l'électrode de commande d'un troisième interrupteur électronique (T3) mis en circuit en série avec un relais de flamme (FR);
    h) le tronçon de circuit du deuxième interrupteur électronique (T1) est mis en service entre une source de tension continue ( + 22 V) et la sortie (FO) de la sonde de flamme (FS);
    i ) les électrodes de commande du premier et du deuxième interrupteurs électronique (T1, T2) sont chacune reliées avec la sortie de l'amplificateur opérationnel (OP);
    j) un condensateur de filtrage (C5) est mis en service entre les deux entrées (+ , - ) de l'amplificateur opérationnel (OP);
    k) le contact de travail (fr, f2) du relais de flamme (FR) est mis en service, par l'intermédiaire d'un redresseur (D7) entre la source de tension alternative et l'autre entrée (+) de l'amplificateur opérationnel ; et
    l) le contact repos (fr, f1) du relais de flamme (FR) relie l'allumeur à étincelles (ZT) à la source de tension alternative .
  2. Agencement de circuit selon la revendication 1, caractérisé en ce qu'un condensateur (C1) et une diode Zener (ZD1) sont mis en circuit en parallèle au montage en série du troisième interrupteur électronique (T3) et du relais de flamme (FR).
  3. Agencement de circuit selon la revendication 1 ou 2, caractérisé en ce que , depuis l'autre entrée (+) de l'amplificateur opérationnel (OP), un diviseur de tension (R8, R11) est branché à la masse et sa sortie (P4) est raccordée, par l'intermédiaire d'une résistance (R12) et du redresseur (D7), au contact de travail (F2) du relais de flamme .
  4. Agencement de circuit selon l'une des revendications 1 à 5 , caractérisé en ce que les électrodes de commande du premier (T2) et du deuxième (T1) interrupteurs électroniques sont raccordées chacune par l'intermédiaire d'une résistance (R18), (R14) à la sortie de l'amplificateur opérationnel (OP).
  5. Agencement de circuit selon l'une des revendications 1 à 4 , caractérisé en ce qu'une touche de rappel à l'état initial (RS) est mise en circuit en parallèle au montage en série du premier condensateur de charge (C2), d'une diode (D9) et du relais de sécurité (SR).
  6. Agencement de circuit selon l'une des revendications 1 à 5 , caractérisé en ce que
    a) le branchement parallèle d'un moteur de ventilateur (LM) et d'un relais de débit d'air (AR) est raccordé, par l'intermédiaire du contact de repos (pr, p1) d'un interrupteur de débit d'air (PR) au contact de travail (sr, s2) du relais de sécurité (SR);
    b) le bras de contact (pr) de l'interrupteur de débit d'air (PR) est relié à son contact de repos (p1) par l'intermédiaire d'un contact de travail (ar, ar2) du relais de débit d'air (AR);
    c) le contact de travail (p2) de l'interrupteur de débit d'air (PR) est raccordé au contact de commutation (gr) du relais de mise en service (GR).
EP91112860A 1991-07-31 1991-07-31 Circuit de commande pour brûleur à gaz Expired - Lifetime EP0533961B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE9191112860T DE59100193D1 (de) 1991-07-31 1991-07-31 Steuerschaltung fuer gasbrenner.
EP91112860A EP0533961B1 (fr) 1991-07-31 1991-07-31 Circuit de commande pour brûleur à gaz

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP91112860A EP0533961B1 (fr) 1991-07-31 1991-07-31 Circuit de commande pour brûleur à gaz

Publications (2)

Publication Number Publication Date
EP0533961A1 EP0533961A1 (fr) 1993-03-31
EP0533961B1 true EP0533961B1 (fr) 1993-07-14

Family

ID=8207002

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91112860A Expired - Lifetime EP0533961B1 (fr) 1991-07-31 1991-07-31 Circuit de commande pour brûleur à gaz

Country Status (2)

Country Link
EP (1) EP0533961B1 (fr)
DE (1) DE59100193D1 (fr)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH648109A5 (de) * 1984-02-15 1985-02-28 Landis & Gyr Ag Schaltung fuer einen feuerungsautomaten.

Also Published As

Publication number Publication date
EP0533961A1 (fr) 1993-03-31
DE59100193D1 (de) 1993-08-19

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