EP1390668B1 - Dispositif de controle de flamme - Google Patents

Dispositif de controle de flamme Download PDF

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Publication number
EP1390668B1
EP1390668B1 EP02727938A EP02727938A EP1390668B1 EP 1390668 B1 EP1390668 B1 EP 1390668B1 EP 02727938 A EP02727938 A EP 02727938A EP 02727938 A EP02727938 A EP 02727938A EP 1390668 B1 EP1390668 B1 EP 1390668B1
Authority
EP
European Patent Office
Prior art keywords
flame
voltage
monitoring device
limiter
diodes
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
EP02727938A
Other languages
German (de)
English (en)
Other versions
EP1390668A1 (fr
Inventor
Klaus Bott
Alexander Diebold
Reiner Kind
Jürgen Hoffmann
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.)
Siemens Building Technologies AG
Original Assignee
Siemens Building Technologies AG
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 Siemens Building Technologies AG filed Critical Siemens Building Technologies AG
Publication of EP1390668A1 publication Critical patent/EP1390668A1/fr
Application granted granted Critical
Publication of EP1390668B1 publication Critical patent/EP1390668B1/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
    • 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
    • F23N5/08—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/26—Details

Definitions

  • the present invention relates to a flame monitoring device according to the preamble of claim 1.
  • a flame monitoring device in which an AC voltage is supplied to a transformer and subsequently to a peak voltage limiter.
  • the peak voltage limiter prevents the transfer of voltage spikes from the mains to the working circuit.
  • VDR Voltage-Dependent-Resistor
  • a problem of such flame monitoring devices are non-flame rectifying effects on the burner, for example in the case of ionization electrodes due to chemical effects between the monitoring electrode and the reference ground.
  • the document US-A-5,899,683 discloses a flame monitoring device in which an input AC voltage is limited by a voltage limiter to a balanced AC voltage, wherein the AC voltage applied to a flame sensor, which operates with the rectifying effect of a flame and flows through the existing flame, a current.
  • the present invention has for its object to make flame monitoring devices of the type mentioned insensitive by appropriate measures against non-flame rectifier effects.
  • the essence of the invention is thus that the voltage limiter generates an asymmetric limit voltage which acts on the sensor.
  • Zener diodes If semiconductor components such as zener diodes are used to generate an asymmetrical voltage, component faults of the zener diode can also be controlled by the higher number of zener diodes in one direction. If a zener diode fails, enough diodes will still be available for safe operation of the voltage limiter. The more additional zener diodes are arranged to produce the asymmetry, the higher the errors can be compensated.
  • the solution with Zener diodes shows in comparison to varistors (for small series resistances) no voltage dependence and it can also be temperature compensated by using Zener diodes with different temperature coefficients.
  • the Zener diode solution enables AC stabilization with standard components available from several manufacturers.
  • the realization of the AC voltage limitation by means of diodes, for example in the form of a diode path also has the advantage that a voltage switch, for example, it may be necessary that the limited AC voltage of an automatic burner must be switched within a switching sequence between two voltage values, in a simple manner by bridging can be done by some diodes of the diode path.
  • the desired voltage swing is freely selectable via the selection of diodes.
  • VDR voltage-dependent resistors
  • Fig. 1 there is schematically illustrated a flame monitoring device which is e.g. is fed via the AC mains voltage 1 and via a transformer 2 with an input voltage U1.
  • the behavior of the input voltage U1 is shown schematically in FIG. 4A.
  • the input voltage U1 is limited to the limit voltage U2, see Fig. 4B.
  • a flame 6 By a burner 5, a flame 6 can be generated.
  • An ionization electrode 7 projects into the flame region of the flame 6.
  • the alternating voltage U2 is applied to the burners 5 acting as electrodes and the ionization electrode 7.
  • By the flame 6 and the applied AC voltage U2 results in a rectified ionisationsstrom.
  • the AC voltage is filtered out and only the uniform portion which is used as a flame signal is forwarded to an amplifier 10, in which the flame signal is amplified and forwarded to a control device, not shown, for further processing.
  • a UV sensor or any sensor which works on the rectification effect of the flame amplifier signal can also be used. These probes also exhibit unwanted rectifying effects, e.g. at mains voltages with DC offset or certain defects of the sensor.
  • Such sensors, as well as the ionization electrode shown in FIG. 1, can be described by the equivalent circuits of FIGS. 2A and 2B to explain the behavior.
  • FIG. 2A shows the burner with flame and ionization electrode illustrated in FIG. 1 between points A and B as an equivalent circuit for ideal behavior with a diode 21 and a resistor 20 in series.
  • the diode produces the same rectifying effect as the flame.
  • FIG. 2B shows the torch with flame and ionization electrode illustrated in FIG. 1 between points A and B as an equivalent circuit for the real behavior with a diode 21 and a resistor 20 in series, to which a resistor 22 is connected in parallel.
  • current flows not only in the forward direction of the diode 21, but also in the reverse direction of the diode.
  • FIG. 2C shows the burner with flame and ionization electrode illustrated in FIG. 1 between points A and B as an equivalent circuit for the contaminated electrode with a diode 21 and a resistor 20 in series, to which a resistor 22 is connected in parallel and a diode 23 and a resistor 24 is connected in series in parallel.
  • FIG. 3 shows a voltage limiter according to the invention for generating an asymmetrical voltage consisting of diodes 31 which conduct from a certain voltage to also in the blocking direction, eg so-called zener diodes, additional zener diodes 32 being arranged in one direction such that the voltage in the forward direction of the diode 21 is increased relative to the voltage in the reverse direction. This means that a higher current flows when the flame is present.
  • the installation direction of the voltage limiter results from the points C and D, which correspond to the points C and D in FIG.
  • the number of Zener diodes used depends on the application and must be designed specifically for each case.
  • the illustrated series resistors 33 are optional and serve to limit the surge current at transient overvoltages.
  • the diode path should preferably be built up only via diodes of the same type and value, ie the same breakdown voltage, in order to simplify the error consideration in the event of a possible short circuit of one (or more) diode. It is also advantageous to use only diodes from the same manufacturer in order to further reduce the irregular error probability.
  • a current i is measured. If the circuit for the ideal behavior according to FIG. 2A is incorporated into the circuit according to FIG. 1, the behavior according to FIG. 5A results for i, with a maximum current i5. This can be explained by the diode 21, by which the negative half-wave is cut off in the reverse direction.
  • the behavior according to FIG. 5B results with a maximum current in the positive direction of i1 and in the negative direction of i2.
  • i1 is greater than i5 (i1> i5), since in addition the resistor 22 is connected in parallel. Through this resistor 22, however, a current can now flow even at the negative half-wave, which has its maximum at i2, but is smaller in magnitude than i.
  • FIG. 4C shows a symmetrical voltage U2 *, as known from the prior art, which is measured at the same measuring points C and D as the voltage U2. If the circuit for the real behavior according to FIG. 2B is installed in the circuit according to FIG. 1, as already explained above, the behavior according to FIG. 5C, with a maximum current, results in a symmetrical behavior of the voltage U2 * known from the prior art in the positive direction of i3 and in the negative direction of i4.

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  • 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)
  • Measurement Of Current Or Voltage (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Control Of Combustion (AREA)

Claims (5)

  1. Dispositif de surveillance de flamme, dans lequel une tension alternative d'entrée (U1) est limitée à une tension limite (U2) au moyen d'un limiteur de tension (4), la tension limite (U2) étant appliquée à un détecteur de flamme (7) lequel fonctionne avec l'effet redresseur d'une flamme et qui, notamment en présence d'une flamme (6), est parcouru par un courant (i),
    caractérisé en ce que
    le limiteur de tension (4) génère une tension limite asymétrique (U2) laquelle est appliquée au détecteur (7).
  2. Dispositif de surveillance de flamme selon la revendication 1,
    caractérisé en ce que
    le limiteur de tension (4) est constitué de plusieurs éléments limiteurs (31, 32) lesquels limitent la tension symétriquement,
    et en ce qu'en outre, afin de générer l'asymétrie, au moins un élément limiteur (32) en plus est disposé de manière à pouvoir obtenir dans le sens de conduction du détecteur de flamme (7), en présence d'une flamme (6), un courant plus élevé (i1) que sans asymétrie (i3).
  3. Dispositif de surveillance de flamme selon la revendication 1 ou 2,
    caractérisé en ce que
    le limiteur de tension (4) est constitué de diodes (31, 32) montées en série, qui à partir d'une certaine tension conduisent aussi dans le sens de non-conduction,
    en ce que chaque fois une moitié d'un nombre pair de diodes (31) est montée dans le sens de conduction et l'autre moitié dans le sens de non-conduction,
    et en ce qu'en outre, afin de générer l'asymétrie, au moins une diode (32) en plus est disposée dans un sens de manière à pouvoir obtenir dans le sens de conduction du détecteur de flamme (7), en présence d'une flamme (6), un courant plus élevé (i1) que sans asymétrie (i3).
  4. Dispositif de surveillance de flamme selon la revendication 3,
    caractérisé en ce que
    les diodes (31, 32) sont du même type.
  5. Dispositif de surveillance de flamme selon l'une des revendications précédentes,
    caractérisé en ce que
    le détecteur (7), lequel fonctionne selon l'effet redresseur de la flamme, est une électrode d'ionisation ou un capteur UV.
EP02727938A 2001-05-25 2002-05-22 Dispositif de controle de flamme Expired - Lifetime EP1390668B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10125574 2001-05-25
DE10125574A DE10125574A1 (de) 2001-05-25 2001-05-25 Flammenüberwachungsvorrichtung
PCT/IB2002/001758 WO2002095295A1 (fr) 2001-05-25 2002-05-22 Dispositif de controle de flamme

Publications (2)

Publication Number Publication Date
EP1390668A1 EP1390668A1 (fr) 2004-02-25
EP1390668B1 true EP1390668B1 (fr) 2007-07-04

Family

ID=7686155

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02727938A Expired - Lifetime EP1390668B1 (fr) 2001-05-25 2002-05-22 Dispositif de controle de flamme

Country Status (5)

Country Link
US (1) US7046154B2 (fr)
EP (1) EP1390668B1 (fr)
AT (1) ATE366395T1 (fr)
DE (2) DE10125574A1 (fr)
WO (1) WO2002095295A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005024763B3 (de) * 2005-05-31 2006-06-08 Stiebel Eltron Gmbh & Co. Kg Heizgerät und Verfahren zum Steuern eines Heizgerätes
EP2154430B1 (fr) * 2008-08-15 2015-09-30 Siemens Aktiengesellschaft Dispositif de commande pour un brûleur à gaz, et utilisation d'un tel dispositiv

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1075317A (en) * 1964-05-22 1967-07-12 Danfoss As Ac-operated switching circuit
DE1230165B (de) * 1964-08-07 1966-12-08 Danfoss As Wechselstromgespeister Flammenwaechter
US3551908A (en) 1967-12-26 1970-12-29 Combustion Eng Flame detector
JPS59217417A (ja) * 1983-05-25 1984-12-07 Matsushita Electric Ind Co Ltd 石油暖房器具
DE4122636C2 (de) * 1991-07-09 1999-08-12 Bosch Gmbh Robert Vorrichtung und Verfahren zum Überwachen einer Flamme
DE19605803A1 (de) * 1996-02-16 1997-08-21 Daug Deutsche Automobilgesells Schaltungsanordnung zur Ionenstrommessung
DK0806610T3 (da) * 1996-05-09 2001-10-15 Stiebel Eltron Gmbh & Co Kg Fremgangsmåde til drift af en brænder
DE19712373A1 (de) * 1997-03-25 1998-10-01 Bosch Gmbh Robert Vorrichtung zum Überwachen eines Brenners
DE19712938C1 (de) * 1997-03-27 1998-05-14 Honeywell Bv Schaltungsanordnung zum Erzeugen einer Speisewechselspannung für den Flammenstab eines Flammenwächters

Also Published As

Publication number Publication date
US20040178915A1 (en) 2004-09-16
ATE366395T1 (de) 2007-07-15
DE50210419D1 (de) 2007-08-16
WO2002095295A1 (fr) 2002-11-28
EP1390668A1 (fr) 2004-02-25
DE10125574A1 (de) 2002-11-28
US7046154B2 (en) 2006-05-16

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