EP1211460B1 - Circuit de surveillance de flamme - Google Patents

Circuit de surveillance de flamme Download PDF

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Publication number
EP1211460B1
EP1211460B1 EP01127983A EP01127983A EP1211460B1 EP 1211460 B1 EP1211460 B1 EP 1211460B1 EP 01127983 A EP01127983 A EP 01127983A EP 01127983 A EP01127983 A EP 01127983A EP 1211460 B1 EP1211460 B1 EP 1211460B1
Authority
EP
European Patent Office
Prior art keywords
transistor
voltage source
flame
burner
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.)
Expired - Lifetime
Application number
EP01127983A
Other languages
German (de)
English (en)
Other versions
EP1211460A3 (fr
EP1211460A2 (fr
Inventor
Jochen Grabe
Carsten Wölfl
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.)
Vaillant GmbH
Original Assignee
Vaillant GmbH
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 Vaillant GmbH filed Critical Vaillant GmbH
Priority to AT01127983T priority Critical patent/ATE338250T1/de
Publication of EP1211460A2 publication Critical patent/EP1211460A2/fr
Publication of EP1211460A3 publication Critical patent/EP1211460A3/fr
Application granted granted Critical
Publication of EP1211460B1 publication Critical patent/EP1211460B1/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

  • the invention relates to a flame detector circuit according to the preamble of the independent claim.
  • a flame detector circuit is already known from document US-A-3,627,458.
  • the aim of the invention is to avoid this disadvantage and to propose a flame detector circuit of the type mentioned, which is characterized by a simple structure and in which only one opposite to the burner mass positive supply voltage for the evaluation circuit is required.
  • an AC voltage source U_Ioni is connected via a resistor R155 and a capacitor C150 connected in series with an ionization electrode Ioni, which is arranged near the flame zone of a burner, not shown.
  • the flame is represented by an equivalent circuit diagram which comprises a high-resistance resistor R flame and a diode D flame connected in series therewith, this series circuit being connected to the mass of the burner.
  • the ionization electrode Ioni is further connected to an evaluation circuit.
  • This comprises a voltage divider circuit consisting of a connected to the ionization loni series connection of the resistors R153 and R154 on the one hand and a resistor R163, which is connected to a positive pole of a DC voltage source Ub.
  • a capacitor C154 is connected in parallel with the resistor R163, to which also the base of a pnp transistor T152 is connected, whose emitter is connected to the positive pole of the DC voltage source Ub.
  • the collector of the transistor T152 is connected via a resistor R164 to the burner mass, which is connected to the negative pole GND of the DC voltage source Ub.
  • a signal device is further connected, which is also connected to the positive pole of the DC voltage source Ub and the negative pole GND.
  • This signal device comprises a capacitor C152, which is connected in series with a diode D150 and another capacitor C151, the latter being connected to a base terminal of a transistor T150, a collector terminal of a transistor T151 and via a resistor R152 to the positive pole of the DC voltage source Ub ,
  • the diode D150 is further connected to the base terminal of the transistor T151 and via a resistor R159 to the burner mass.
  • the capacitor C152 and the diode D150 are also connected to the burner mass via a resistor R158.
  • the emitter of the transistor T151 is connected via a resistor R161 to the burner mass, or the negative pole GND of the DC voltage source Ub, wherein the emitter of the transistor T150 is also connected to the burner mass via this resistor and a resistor R162 connected in series therewith.
  • the collector of the transistor T150 is directly connected to the positive pole of the Gleichspanungsttle Ub.
  • resistors R157 and R160 are connected to indications _flame 1 and _flame2.
  • the AC voltage applied to the base of T152 is insufficient to drive transistor T152.
  • Transistor T152 is permanently disabled. This also turns off the transistor T151 and the transistor T150 is turned on.
  • the potential on the _Flame1 and the optional second _Flame2 displays is a high potential, meaning that no flame is detected.
  • the transistor T150 blocks permanently and the indications _flame1 and _flame2 are applied to a low level resulting essentially from the voltage divider formed by the resistors R152 and R161. If the potential at the base of the transistor T152 is so small at low-resistance flame that it is permanently driven, then the transistor T151 is also permanently driven via the resistor R165 and the diode D150 and the transistor T150 is turned off. In this case, a low level is also applied to the _Flame1 and _Flame2 displays, which in turn corresponds to a detected flame.
  • a hysteresis behavior can be set.
  • the resistors R164, R165, R158 and R159 In conjunction with the capacitors C152 and C151, the sensitivity of the evaluation circuit or the signal device can be adjusted.
  • the circuit is designed so that component faults either always lead to a static output signal, even in conjunction with an independent secondary fault, or do not affect the function of the circuit or only in terms of sensitivity. This allows the use of e.g. in gas burner control units according to EN 298.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
  • Control Of Combustion (AREA)
  • Fire-Detection Mechanisms (AREA)

Claims (2)

  1. Circuit contrôleur de flammes avec une électrode à ionisation (Ioni) connectée à une tension alternative (U_Ioni) et posée à proximité d'une zone de combustion d'un brûleur, et avec un montage analyseur connecté à une source de tension continue (Ub) et comprenant un transistor (T152) commandé par le courant s'écoulant par l'électrode à ionisation (Ioni) qui actionne un dispositif de signalisation, circuit caractérisé par le fait que le pôle négatif (GND) de la source de tension continue (Ub) touche la masse du brûleur, et le pôle positif de la source de tension continue (Ub) est relié, par l'intermédiaire d'un filtre passe-bas (C154, R153, R154) à l'électrode à ionisation (Ioni), et la base du transistor (T152) au condensateur (C154) du filtre passe-bas.
  2. Circuit contrôleur de flammes suivant la revendication 1, caractérisé par le fait que le transistor (T152) est conçu comme transistor pnp, et une résistance (R163) est mise en parallèle au condensateur (C154) relié au pôle positif de la source de tension continue (Ub), l'émetteur du transistor (T152) étant également relié au pôle positif de la source de tension continue (Ub).
EP01127983A 2000-12-01 2001-11-24 Circuit de surveillance de flamme Expired - Lifetime EP1211460B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT01127983T ATE338250T1 (de) 2000-12-01 2001-11-24 Flammenwächterschaltung

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10061252 2000-12-01
DE10061252 2000-12-01
AT8622001 2001-06-05
AT8622001 2001-06-05

Publications (3)

Publication Number Publication Date
EP1211460A2 EP1211460A2 (fr) 2002-06-05
EP1211460A3 EP1211460A3 (fr) 2004-04-14
EP1211460B1 true EP1211460B1 (fr) 2006-08-30

Family

ID=25608447

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01127983A Expired - Lifetime EP1211460B1 (fr) 2000-12-01 2001-11-24 Circuit de surveillance de flamme

Country Status (5)

Country Link
EP (1) EP1211460B1 (fr)
AT (1) ATE338250T1 (fr)
DE (2) DE50110866D1 (fr)
DK (1) DK1211460T3 (fr)
ES (1) ES2270940T3 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1277402A (en) * 1968-08-27 1972-06-14 United Gas Industries Ltd Flame detection system
NL8401173A (nl) * 1984-04-12 1985-11-01 Philips Nv Vlambeveiligingsschakeling.
GB8906235D0 (en) * 1989-03-17 1989-05-04 Cambridge Instr Ltd Flame detection apparatus and method
US5472336A (en) * 1993-05-28 1995-12-05 Honeywell Inc. Flame rectification sensor employing pulsed excitation
JP3219006B2 (ja) 1997-01-29 2001-10-15 トヨタ自動車株式会社 動力出力装置

Also Published As

Publication number Publication date
EP1211460A3 (fr) 2004-04-14
DK1211460T3 (da) 2007-01-08
ATE338250T1 (de) 2006-09-15
DE10159032A1 (de) 2002-09-12
DE50110866D1 (de) 2006-10-12
ES2270940T3 (es) 2007-04-16
EP1211460A2 (fr) 2002-06-05

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