EP0867661B1 - Dispositif de surveillance de flamme avec électrode d'ionisation - Google Patents

Dispositif de surveillance de flamme avec électrode d'ionisation Download PDF

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Publication number
EP0867661B1
EP0867661B1 EP19980105254 EP98105254A EP0867661B1 EP 0867661 B1 EP0867661 B1 EP 0867661B1 EP 19980105254 EP19980105254 EP 19980105254 EP 98105254 A EP98105254 A EP 98105254A EP 0867661 B1 EP0867661 B1 EP 0867661B1
Authority
EP
European Patent Office
Prior art keywords
flame
circuit
voltage
threshold
phase
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
EP19980105254
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German (de)
English (en)
Other versions
EP0867661A3 (fr
EP0867661A2 (fr
Inventor
Jur De Pauw
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
Original Assignee
Honeywell BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honeywell BV filed Critical Honeywell BV
Publication of EP0867661A2 publication Critical patent/EP0867661A2/fr
Publication of EP0867661A3 publication Critical patent/EP0867661A3/fr
Application granted granted Critical
Publication of EP0867661B1 publication Critical patent/EP0867661B1/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
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods
    • F23N5/123—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods using electronic means

Definitions

  • Figure 1 shows a conventional flame monitoring circuit of this type, which is known for example from GB 2 153 126 (A) with a Burner B, whose flame F is monitored with the help of a flame rod FR. He educates existing flame F together with this and with the burner at ground potential a rectifier DF indicated by a dotted line in FIG. 1.
  • the flame rod FR is about a coupling capacitor C1 and a resistor R1 from a phase line L des AC network powered.
  • the ground line N of the network i.e. whose star point is extremely low-resistance grounded, the inevitable earth resistance with RG is designated.
  • FIG. 3 it generates from the two phase lines PH1 and PH2, for example with one Frequency of 50Hz fed rectifier bridge circuit D1 to D4 on your Load resistor RL a half-wave voltage of double frequency, e.g. 100Hz. which about the capacitor C1 and a resistor R1 as excitation voltage VE the flame rod FR is fed.
  • Burner B is grounded as usual.
  • the star point MP of the three-phase power supply via a non-negligible earth resistance RG is grounded.
  • the lower input of the flame amplifier FA is here, not as in FIG. 1 Ground connected, but to one of the two phases PH2.
  • the excitation voltage VE becomes not related to earth or earth, but to one of the phase potentials, here PH2.
  • the use of one of the Mains AC voltage different frequency of the excitation voltage VE ensures at all possible potential states of the center point MP a certain minimum value of Excitation voltage VE related to earth.
  • the 100Hz signal is without any special Isolating transformer derived directly from the three-phase network.
  • FIG. 4 shows the 100 Hz half-wave voltage referred to earth in the event that the Potential of the star point MP just in the middle between the phase potentials PH1 and PH2 lies.
  • the ripple VR of the 100 Hz signal represents the AC supply voltage for the Rectifier available, which generates the excitation voltage VE.
  • This value of Excitation voltage VE is also the minimum value.
  • FIG. 5 shows one to increase the effective excitation voltage or the excitation current Threshold circuit before, with the help of the excitation voltage VE practically on the double value can be increased.
  • This threshold value switching as in FIG. 6 shown, a lowering of the instantaneous value of the excitation voltage VE to zero as soon as this falls below a threshold value VS in the course of the sinusoidal voltage change.
  • a threshold circuit is connected to the output of the rectifier bridge circuit D1 to D4 connected, according to FIG. 5, an electronic switch Q1, for example has a transistor and a Zener diode Z as a threshold value determining elements.
  • the transistor Q1 is on the one hand connected to the coupling capacitor C1 and on the other hand, via a high-resistance resistor R7 to the one bridge diagonal point D1 / D2 of the rectifier bridge connected. Its emitter is compared to one to resistor R7 low-resistance resistor R6 with the other bridge diagonal point D3 / D4 in connection.
  • the control voltage at the base of transistor Q1 is at a Zener diode Z1 tapped, which in series with a resistor R4 to the two Bridge output points D1, D2 and D3 / D4 are connected.
  • the resistors R5 and R6 form a voltage divider for generating the emitter voltage of transistor Q1.
  • the switch Q1 is conductive below an instantaneous value of the voltage VE of, for example, 200V. This value is determined by the Zener diode Z1. This means that, as shown in FIG. 6, the excitation voltage VE is reduced to zero below this threshold voltage of 200V. Above the threshold voltage of, for example, 200V, however, it follows the sine curve of the mains voltage, because in this case the transistor Q1 is blocked. It should be noted that this threshold voltage of 200 V here is not the phase voltage of the network, but a threshold DC voltage specified by the Zener diode Z1.
  • the circuit according to FIG. 5 replaces the one in FIG. 3 between the phase lines PH1 and PH2 on the one hand and the coupling capacitor C1 on the other hand Rectifier bridge circuit including load resistor.
  • Other embodiments can also be used within the scope of the invention are used by frequency multiplier circuits as they are used as semiconductor components affordable prices and are much cheaper than a special isolating transformer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rectifiers (AREA)
  • Control Of Combustion (AREA)
  • Measurement Of Current Or Voltage (AREA)

Claims (5)

  1. Circuit pour produire une tension alternative d'alimentation pour la barre de flamme (FR) d'un contrôleur de flamme qui fonctionne, avec brûleur (B) mis à la terre, dans un réseau triphasé avec neutre (MP) mis à la terre à travers une résistance (RG), caractérisé en ce que
    a) un circuit multiplicateur de fréquence (D1 à D4), alimenté à partir de deux lignes de phase (PH1, PH2) du réseau triphasé, alimente la barre de flamme (FR) à travers un condensateur (C1), et
    b) l'une des lignes de phase (PH2) sert de potentiel de référence pour le contrôleur de flamme (FA).
  2. Circuit selon la revendication 1, caractérisé en ce que le circuit multiplicateur de fréquence (D1 à D4) est un redresseur biplaque, de préférence un circuit redresseur en pont.
  3. Circuit selon la revendication 1 ou 2, caractérisé en ce qu'en aval du circuit multiplicateur de fréquence (D1 à D4) est monté un circuit à valeur seuil (Q1, R5, R6) qui abaisse la tension de sortie jusqu'à pratiquement zéro, au-dessous d'une tension seuil prédéfinie (par exemple 220 V).
  4. Circuit selon la revendication 3, caractérisé en ce que le circuit à valeur seuil comporte un transistor (Q1) qui est raccordé, par son collecteur, au condensateur (C1), par son émetteur à un diviseur de tension (R5, R6) alimenté depuis le circuit du redresseur, et par sa base à une diode Zener (Z1) qui détermine la tension seuil.
  5. Circuit selon la revendication 4, caractérisé en ce que la diode Zener (Z1) est raccordée en série avec une autre résistance (R4) à la sortie du circuit du redresseur (D1 à D4).
EP19980105254 1997-03-27 1998-03-24 Dispositif de surveillance de flamme avec électrode d'ionisation Expired - Lifetime EP0867661B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19710938 1997-03-27
DE1997112938 DE19712938C1 (de) 1997-03-27 1997-03-27 Schaltungsanordnung zum Erzeugen einer Speisewechselspannung für den Flammenstab eines Flammenwächters

Publications (3)

Publication Number Publication Date
EP0867661A2 EP0867661A2 (fr) 1998-09-30
EP0867661A3 EP0867661A3 (fr) 2000-05-24
EP0867661B1 true EP0867661B1 (fr) 2002-09-11

Family

ID=7824825

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980105254 Expired - Lifetime EP0867661B1 (fr) 1997-03-27 1998-03-24 Dispositif de surveillance de flamme avec électrode d'ionisation

Country Status (3)

Country Link
EP (1) EP0867661B1 (fr)
DE (2) DE19712938C1 (fr)
ES (1) ES2179394T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022203963B3 (de) 2022-04-25 2023-07-20 Prüfrex engineering e motion gmbh & co. kg Schaltungsanordnung zur Flammenüberwachung

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10125574A1 (de) * 2001-05-25 2002-11-28 Siemens Building Tech Ag Flammenüberwachungsvorrichtung
DE10202910C1 (de) * 2002-01-25 2003-10-16 Honeywell Bv Schaltungsanordnung zur Ermittlung des Flammenstromes eines Brenners
DE10312669B3 (de) * 2003-03-21 2004-10-21 Honeywell B.V. Schaltungsanordnung zur Ermittlung des Flammenstromes eines Brenners

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2536092A1 (de) * 1975-08-13 1977-02-24 Bosch Gmbh Robert Elektrischer flammenwaechter fuer oel- oder gasbrenner
CH663077A5 (de) * 1983-12-14 1987-11-13 Landis & Gyr Ag Selbstueberwachender flammenwaechter.
GB2252436A (en) * 1991-02-04 1992-08-05 Black Automatic Controls Limit Flame detection circuit and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022203963B3 (de) 2022-04-25 2023-07-20 Prüfrex engineering e motion gmbh & co. kg Schaltungsanordnung zur Flammenüberwachung

Also Published As

Publication number Publication date
ES2179394T3 (es) 2003-01-16
DE59805467D1 (de) 2002-10-17
EP0867661A3 (fr) 2000-05-24
EP0867661A2 (fr) 1998-09-30
DE19712938C1 (de) 1998-05-14

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