JPS63201420A - Flame detector - Google Patents
Flame detectorInfo
- Publication number
- JPS63201420A JPS63201420A JP62035049A JP3504987A JPS63201420A JP S63201420 A JPS63201420 A JP S63201420A JP 62035049 A JP62035049 A JP 62035049A JP 3504987 A JP3504987 A JP 3504987A JP S63201420 A JPS63201420 A JP S63201420A
- Authority
- JP
- Japan
- Prior art keywords
- burner
- flame
- voltage
- terminal
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
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
- F23N2223/00—Signal processing; Details thereof
- F23N2223/08—Microprocessor; Microcomputer
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2229/00—Flame sensors
- F23N2229/12—Flame sensors with flame rectification current detecting means
Landscapes
- 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)
- Control Of Combustion (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は燃焼器に使用する火炎検出装置に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flame detection device for use in a combustor.
従来の技術
第３図は従来の火炎検出装置の一例を示したもので、１
はＡＣ電圧を作るためのトランス、５はバーナ、６はバ
ーナ５の火炎中に配置された電極、２．８．１０はコン
デンサ、３．４．７．９．１１．１２は抵抗、１３はＦ
ＥＴである。Conventional technology Figure 3 shows an example of a conventional flame detection device.
is a transformer for generating AC voltage, 5 is a burner, 6 is an electrode placed in the flame of burner 5, 2.8.10 is a capacitor, 3.4.7.9.11.12 is a resistor, 13 is a F
It is ET.
ここで、バーナ５に火炎が無い場合にはバーナ５と電極
６の間の抵抗は無限大であり、トランス１で与えられる
ＡＣ電圧は正負共に同一のインピーダンスのため平滑回
路として動作する抵抗７．９及びコンデンサ８．１０に
よりＦＥＴ１３のゲート電圧ＶＧはＶ。Ｃと同程度の電
圧となる。Here, when there is no flame in the burner 5, the resistance between the burner 5 and the electrode 6 is infinite, and since the AC voltage given by the transformer 1 has the same impedance on both positive and negative sides, the resistance 7. 9 and capacitor 8.10, the gate voltage VG of FET 13 is V. The voltage is about the same as C.
次にバーナに火炎が有する場合には、バーナ５に対して
電極６の電位が高い場合には電流が流れ、逆に電極６の
電位が低い場合には電流が流れないという整流作用があ
るため、トランス１で与えられるＡＣ電圧の正負のイン
ピーダンスに差が生じ、平滑された後のＶＧ’［［Ｅは
ｖｏ。よ’）ＶＦＲだけ低下することになる。さらにバ
ーナ５と電極６が短絡している場合ではバーナ５に火炎
が無い場合と同様にＡＣ電圧の正負のインピーダンスが
同一となるためにＶＧは火炎が無い場合と同レベルとな
る。ここでＦＥＴ １３の０Ｎ−ＯＦＦのしきい値をｖ
ｃｃと（ｖｃｃ ’Ｆ’Ｒ）の中間に設定すればバーナ
５に火炎が、有る場合と無い場合及び電極の短絡の検出
が可能となる。第４図にバーナ５に火炎が有る場合と無
い場合との第３図における各ポイントの電圧を図示する
。Next, when there is a flame in the burner, there is a rectifying effect in which current flows when the potential of electrode 6 is high relative to burner 5, and conversely, no current flows when the potential of electrode 6 is low. , a difference occurs between the positive and negative impedances of the AC voltage given by the transformer 1, and after smoothing, VG'[[E is vo. y') VFR will decrease. Further, when the burner 5 and the electrode 6 are short-circuited, the positive and negative impedances of the AC voltage are the same as when there is no flame in the burner 5, so VG is at the same level as when there is no flame. Here, the 0N-OFF threshold of FET 13 is v
If it is set between cc and (vcc 'F'R), it becomes possible to detect whether there is a flame in the burner 5 or not, and whether there is a short circuit between the electrodes. FIG. 4 illustrates the voltage at each point in FIG. 3 when there is a flame in the burner 5 and when there is no flame.
発明が解決しようとする問題点
しかしながら上記構成においては、正弦波の交流電圧を
平滑することにより火炎検出をしているために、バーナ
と電極間に大きな電圧を与えなければ火炎の有無の判定
を正確に行なえなく、また電極が短絡しているのか、火
炎が無いのかの判断をすることができないという欠点が
あった。Problems to be Solved by the Invention However, in the above configuration, since the flame is detected by smoothing the sinusoidal AC voltage, it is difficult to determine the presence or absence of a flame unless a large voltage is applied between the burner and the electrode. It has the disadvantage that it cannot be done accurately and it is not possible to judge whether the electrodes are short-circuited or there is no flame.
本発明はこの様な従来の問題点を解決するものでバーナ
と電極間に印加する電圧が低い電圧でも火炎検出ができ
、また火炎の状態も判定できる火炎検出装置を提供する
ことを目的とするものである。The present invention solves these conventional problems, and aims to provide a flame detection device that can detect flame even when the voltage applied between the burner and the electrode is low, and can also determine the state of the flame. It is something.
問題点を解決するための手段
上記問題点を解決するために、本発明の火炎検出装置は
バーナと電極間に直流電圧を正負交互に印加し、それに
より流れる電流波形をマイクロコンピュータで判断する
ことにより火炎の状態を判定できるようにしたものであ
る。Means for Solving the Problems In order to solve the above problems, the flame detection device of the present invention applies DC voltage alternately between the positive and negative voltages between the burner and the electrodes, and uses a microcomputer to determine the waveform of the resulting current. This makes it possible to determine the state of the flame.
作 用
本発明は上記した構成により、高い電圧を印加すること
なしに低電圧で火炎の状態を判定することが可能となる
ものである。Function The present invention, with the above-described configuration, makes it possible to determine the state of the flame with a low voltage without applying a high voltage.
実施例 以下本発明の一実施例を第１図にもとづいて説明する。Example An embodiment of the present invention will be described below based on FIG.
この第１図において２１．２２．２７は抵抗、２３．２
４．２Ｂはオペアンプ２５は導電性のバーナ、２６はバ
ーナ２６の火炎中に配置された電極、２９はＡ／Ｄ変換
回路、３０はマイクロコンピュータ（以下マイコンとい
う）、３１はオペアンプ２３．２４で構成された電源、
３２は電流検出回路である。In this figure 1, 21.22.27 are resistances, 23.2
4.2B is an operational amplifier 25 which is a conductive burner, 26 is an electrode placed in the flame of the burner 26, 29 is an A/D conversion circuit, 30 is a microcomputer (hereinafter referred to as microcomputer), and 31 is an operational amplifier 23.24. configured power supply,
32 is a current detection circuit.
以上のように構成された火炎検出装置について以下その
動作について説明する。The operation of the flame detection device configured as described above will be explained below.
オペアンプ２ａの十人力及びオペアンプ２４の一人力に
、ｖｃｏを抵抗２１及び２２により分割された電圧を印
加し、オペアンプ２ａの一人力及びオペアンプ２４の十
人力ｖｉＫマイコン３ｏからｖｏＣとＧＮＤレベμの電
圧を交互忙印加すればｖｌがｖｃｃのときはオペアンプ
２３の出力ＶＡはＧＮＤレベルに、オペアンプ２４の出
力はｖｃｏトなり、ｖｉがＧＮＤレベルのときにはＶＡ
はｖｃｏ、オ゛ペアンプ２４の出力はＧＮＤレベｐとな
り、バーナ２５と電極２６の間に正負交互の電圧を印加
する電源を構成することができる。ここでバーナ２５に
火炎が無い場合には、バーナ２５と電極２６の間の抵抗
は無限大のため、オペアンプ２８の出力ＶＢはＶＡがＶ
。Ｃのときはｖｃｃであり、ｖＡがＧＮＤレベμのとき
はＧＮＤレベｐとなる。またバーナ２５と電極２６が短
絡しているときのｖＢは、ＶＡがｖｃｃのときはＧＮＤ
レベμであ妙、ＶＡがＧＮＤレベルのときはｖｃｏとな
る。次にバーナ２５に火炎がある場でＶＡがｖｃｏのと
きは電極２６からバーナ２５に電流が流れ抵抗２７に電
圧降下ＶＦＲが生じ、ｖＢは■。。よ’） ＶＦＲだけ
低い電圧となり、ＶＡがＧＮＤレベルのときは火炎の整
流作用によりバーナ２５から電極２６には電流が流れな
いためｖＢはＧＮＤレベルとなる。ここで電流検出回路
から発生されたｖＢ電圧をＡ／Ｄ変換回路２９で信号処
理し、マイコンａＯで判断すれば、それぞれの火炎、バ
ーナ２５と電極２６との状態を判定することが可能とな
る。この場合、抵抗２７の電圧降下の絶対値をマイコン
３０で判定するためｖｃＣが低くても確実に状態を判断
できることは明らかである。第２図に火炎が有る場合、
無い場合、バーナと電極が短絡している場合の第１図に
おける各ポイントの電圧を図示する。A voltage divided by the resistors 21 and 22 is applied to the VCO to the power of the operational amplifier 2a and the power of the operational amplifier 24, and the voltage of voC and GND level μ from the power of the operational amplifier 2a and the power of the operational amplifier 24 is applied from the viK microcomputer 3o. If vl is applied alternately, the output VA of the operational amplifier 23 will be at the GND level, the output of the operational amplifier 24 will be at the GND level, and when vi is at the GND level, the VA will be
is VCO, and the output of the operational amplifier 24 is at the GND level P, so that a power source can be constructed that applies alternating positive and negative voltages between the burner 25 and the electrode 26. Here, when there is no flame in the burner 25, the resistance between the burner 25 and the electrode 26 is infinite, so the output VB of the operational amplifier 28 is
. When vA is GND level μ, the GND level is p. Also, vB when burner 25 and electrode 26 are short-circuited is GND when VA is vcc.
It is strange at level μ, and when VA is at GND level, it becomes vco. Next, when there is a flame in the burner 25 and VA is vco, current flows from the electrode 26 to the burner 25, causing a voltage drop VFR across the resistor 27, and vB becomes ■. . y') The voltage becomes lower by VFR, and when VA is at GND level, no current flows from burner 25 to electrode 26 due to the rectification effect of the flame, so vB is at GND level. Here, if the vB voltage generated from the current detection circuit is signal-processed by the A/D conversion circuit 29 and judged by the microcomputer aO, it becomes possible to judge the status of each flame, burner 25, and electrode 26. . In this case, since the microcomputer 30 determines the absolute value of the voltage drop across the resistor 27, it is clear that the state can be reliably determined even if vcC is low. If there is a flame in Figure 2,
The voltage at each point in FIG. 1 is illustrated when there is no short circuit between the burner and the electrode.
以上のように本実施例によれば、バーナと電極間に低い
直流電圧を正負交互に与えただけで火炎の状態及びバー
ナと電極の状態をも判断することが可能となる。As described above, according to this embodiment, it is possible to determine the state of the flame and the state of the burner and electrodes simply by applying a low DC voltage alternately between positive and negative voltages between the burner and the electrodes.
発明の効果
以上のように本発明によれば、従来のようにバーナと電
極間に高い交流電圧を印加することなしに、低電圧の直
流を正負交互に印加することにより火炎の状態及びバー
ナと電極の状態の判断を行なうことができる。Effects of the Invention As described above, according to the present invention, the state of the flame and the burner can be controlled by applying low voltage DC alternately between positive and negative voltages, without applying a high AC voltage between the burner and the electrodes as in the past. The state of the electrode can be determined.
第１図は本発明の一実施例を示す火炎検出装置の溝成図
、第２図は第１図の回路の各ポイントの電圧特性図、第
３図は従来例を示す火炎検出装置の回路図、第４図は第
３図の回路の各ポイントの電圧特性図である。
２３．２４，２Ｂ・・・・・・オペアンプ、２５・・・
・・・バーナ、２６・・・・・・電極、２９・・・・・
・Ａ／Ｄ変換回路、３０・内・・マイクロコンピュータ
。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名２３
．２４２１３−オペアンプ
３−バーナ
３Ｄ−マイクロコンピュータ
（０１火炎が奢る場合 ｔｂｚ Ｋ受が無い場
合ＬＣＩ知ｌルしている堝会Fig. 1 is a circuit diagram of a flame detection device showing an embodiment of the present invention, Fig. 2 is a voltage characteristic diagram at each point of the circuit of Fig. 1, and Fig. 3 is a circuit diagram of a flame detection device showing a conventional example. 4 is a voltage characteristic diagram at each point of the circuit of FIG. 3. 23.24,2B... operational amplifier, 25...
...Burner, 26...Electrode, 29...
・A/D conversion circuit, 30・inside...microcomputer. Name of agent: Patent attorney Toshio Nakao and 1 other person23
．． 24213-Op Amp 3-Burner 3D-Microcomputer (01 If the flame is used tbz If there is no K receiver, the LCI is well known)
Claims (1)
置された電極と、前記バーナと前記電極間に直流電圧を
正負交互に印加する電源と、前記直流電圧により流れる
電流を検出する電流検出回路と、検出した電流をマイク
ロコンピュータで判断させるためのＡ／Ｄ変換回路とを
備えたことを特徴とする火炎検出装置。a conductive burner, an electrode disposed in a flame burning on the burner, a power source that alternately applies a positive and negative DC voltage between the burner and the electrode, and a current detector that detects a current flowing due to the DC voltage. 1. A flame detection device comprising: a circuit; and an A/D conversion circuit for causing a microcomputer to judge the detected current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62035049A JPS63201420A (en) | 1987-02-18 | 1987-02-18 | Flame detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62035049A JPS63201420A (en) | 1987-02-18 | 1987-02-18 | Flame detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63201420A true JPS63201420A (en) | 1988-08-19 |
Family
ID=12431182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62035049A Pending JPS63201420A (en) | 1987-02-18 | 1987-02-18 | Flame detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63201420A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009110015A1 (en) * | 2008-03-07 | 2009-09-11 | Bertelli & Partners S.R.L. | Improved method and device to detect the flame in a burner operating on a solid, liquid or gaseous combustible |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61243217A (en) * | 1985-04-18 | 1986-10-29 | Matsushita Electric Ind Co Ltd | Combustion sensing device |
-
1987
- 1987-02-18 JP JP62035049A patent/JPS63201420A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61243217A (en) * | 1985-04-18 | 1986-10-29 | Matsushita Electric Ind Co Ltd | Combustion sensing device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009110015A1 (en) * | 2008-03-07 | 2009-09-11 | Bertelli & Partners S.R.L. | Improved method and device to detect the flame in a burner operating on a solid, liquid or gaseous combustible |
| US8773137B2 (en) | 2008-03-07 | 2014-07-08 | Bertelli & Partners, S.R.L. | Method and device to detect the flame in a burner operating on a solid, liquid or gaseous combustible |
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