EP1211460A2 - Flammenwächterschaltung - Google Patents
Flammenwächterschaltung Download PDFInfo
- Publication number
- EP1211460A2 EP1211460A2 EP01127983A EP01127983A EP1211460A2 EP 1211460 A2 EP1211460 A2 EP 1211460A2 EP 01127983 A EP01127983 A EP 01127983A EP 01127983 A EP01127983 A EP 01127983A EP 1211460 A2 EP1211460 A2 EP 1211460A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- transistor
- flame
- voltage source
- burner
- ionization electrode
- 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
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 5
- 238000011156 evaluation Methods 0.000 claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 11
- 230000011664 signaling Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
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 monitor circuit according to the preamble of independent claim.
- the aim of the invention is to avoid this disadvantage and a flame guard circuit to propose the type mentioned above, which is characterized by a simple structure distinguished and in which only a positive supply voltage compared to the burner mass is required for the evaluation circuit.
- the proposed measures achieve in a simple manner that the over Ionization electrode flowing ionization current from the transistor of the evaluation circuit can be detected.
- an AC voltage source U_Ioni is connected via a resistor R155 and a capacitor C150 connected in series therewith to 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 ground of the burner.
- the ionization electrode ioni is further connected to an evaluation circuit.
- This includes a voltage divider circuit consisting of one with the ionization electrode loni connected series connection of resistors R153 and R154 on the one hand and one Resistor R163, which is connected to a positive pole of a DC voltage source Ub is.
- a capacitor C154 is connected in parallel to the resistor R163, on which also which is connected to the base of a pnp transistor T152, whose emitter is connected to the positive pole of the DC voltage source Ub is connected.
- the collector of the Transistor T152 is connected to the burner ground via a resistor R164 the negative pole GND of the DC voltage source Ub is connected.
- a signal device is also connected to the collector of transistor T152 also with the positive pole of the DC voltage source Ub and its negative pole GND is connected.
- This signaling device comprises a capacitor C152 connected in series with a diode D150 and another capacitor C151 is connected, the latter with a Base terminal of a transistor T150, a collector terminal of a transistor T151 and via a resistor R152 with the positive pole of the DC voltage source Ub connected is.
- the diode D150 is further connected to the base terminal of the transistor T151 and connected to the burner ground via a resistor R159.
- the capacitor C152 and the diode D150 are also connected via a resistor R158 connected to the burner mass.
- the emitter of transistor T151 is connected to the burner ground via a resistor R161, or the negative pole GND of the DC voltage source Ub, the emitter of transistor T150 through this resistor and one connected in series with it Resistor R162 is also connected to the burner ground.
- the collector of transistor T150 is directly connected to the positive pole of the DC voltage source Ub.
- Resistors R157 and R160 _Flame 1 and _Flame2 indicators connected.
- the flame in the sense of an electronic equivalent circuit forms a high-resistance diode path to the resistor R flame in series with the diode D flame, the voltage across the ionisation electrode loni voltage U_Ioni is through resistors R153, R154 and R163 is divided down and in combination filtered with the capacitor C154 low pass.
- the AC voltage thus applied to the base of T152 is not sufficient to drive transistor T152.
- the transistor T152 is permanently blocked. This also blocks transistor T151 and transistor T150 is turned on.
- the potential on the _Flamme1 displays and the optional second _Flamme2 display is a high potential, which means that no flame is detected.
- transistor T150 blocks permanently and on the _Flamme1 and _Flamme2 displays is a, essentially from the voltage divider, through the resistors R152 and R161 is formed, resulting in the low level. If the flame is low, it will Potential at the base of the transistor T152 is so small that it is driven permanently, transistor T151 also becomes permanent via resistor R165 and diode D150 controlled and the transistor T150 blocks. In this case there is also a low level the _Flamme1 and _Flamme2 displays, which in turn means that a flame has been detected equivalent.
- a Hysteresis behavior can be set.
- Via resistors R164, R165, R158 and R159 in connection with the capacitors C152 and C151 the sensitivity of the Evaluation circuit or the signal device can be set.
- the circuit is designed so that component errors always, even in connection with a independent second error, either lead to a static output signal, or the Do not influence the function of the circuit or only in terms of sensitivity. This enables the use e.g. in automatic burner controls 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)
Abstract
Description
Claims (2)
- Flammenwächterschaltung mit einer an eine Wechselspannung (U_Ioni) angeschlossene lonisationselektrode (loni), die nahe einem Flammenbereich eines Brenners angeordnet ist, und einer Auswerteschaltung, die an einer Gleichspannungsquelle (Ub) liegt und einen vom über die lonisationselektrode (loni) fließenden Strom gesteuerten Transistor (T152) aufweist, der eine Signaleinrichtung steuert, dadurch gekennzeichnet, daß der negative Pol (GND) der Gleichspannungsquelle (Ub) an der Masse des Brenners liegt und der positive Pol der Gleichspannungsquelle (Ub) über ein Tiefpassfilter (C154, R153, R154) mit der lonisationselektrode (loni) verbunden und die Basis des Transistors (T152) mit dem Kondensator (C154) des Tiefpassfilters verbunden ist.
- Flammenüberwachungsschaltung nach Anspruch 1, dadurch gekennzeichnet, daß der Transistor (T152) als pnp-Transistor ausgebildet ist und ein Widerstand (R163) parallel zu dem an den positiven Pol der Gleichspannungsquelle (Ub) angeschlossenen Kondensator (C154) geschaltet ist, wobei der Emitter des Transistors (T152) ebenfalls mit dem positiven Pol der Gleichspannungsquelle (Ub) verbunden ist.
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 true EP1211460A2 (de) | 2002-06-05 |
| EP1211460A3 EP1211460A3 (de) | 2004-04-14 |
| EP1211460B1 EP1211460B1 (de) | 2006-08-30 |
Family
ID=25608447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01127983A Expired - Lifetime EP1211460B1 (de) | 2000-12-01 | 2001-11-24 | Flammenwächterschaltung |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1211460B1 (de) |
| AT (1) | ATE338250T1 (de) |
| DE (2) | DE50110866D1 (de) |
| DK (1) | DK1211460T3 (de) |
| ES (1) | ES2270940T3 (de) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10212983A (ja) | 1997-01-29 | 1998-08-11 | Toyota Motor Corp | 動力出力装置 |
Family Cites Families (4)
| 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 |
-
2001
- 2001-11-24 EP EP01127983A patent/EP1211460B1/de not_active Expired - Lifetime
- 2001-11-24 DE DE50110866T patent/DE50110866D1/de not_active Expired - Lifetime
- 2001-11-24 DK DK01127983T patent/DK1211460T3/da active
- 2001-11-24 AT AT01127983T patent/ATE338250T1/de active
- 2001-11-24 ES ES01127983T patent/ES2270940T3/es not_active Expired - Lifetime
- 2001-11-26 DE DE10159032A patent/DE10159032A1/de not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10212983A (ja) | 1997-01-29 | 1998-08-11 | Toyota Motor Corp | 動力出力装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE338250T1 (de) | 2006-09-15 |
| EP1211460A3 (de) | 2004-04-14 |
| DE50110866D1 (de) | 2006-10-12 |
| DE10159032A1 (de) | 2002-09-12 |
| EP1211460B1 (de) | 2006-08-30 |
| ES2270940T3 (es) | 2007-04-16 |
| DK1211460T3 (da) | 2007-01-08 |
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