JPS5731724A - Flame detecting circuit operated by low voltage such as several volts - Google Patents
Flame detecting circuit operated by low voltage such as several voltsInfo
- Publication number
- JPS5731724A JPS5731724A JP10640180A JP10640180A JPS5731724A JP S5731724 A JPS5731724 A JP S5731724A JP 10640180 A JP10640180 A JP 10640180A JP 10640180 A JP10640180 A JP 10640180A JP S5731724 A JPS5731724 A JP S5731724A
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- detecting circuit
- fet30
- base
- flame detecting
- 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
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
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)
Abstract
PURPOSE:To minimize the size of the flame detecting circuit which has at the initial input stage a source follower circuit of an field effect transistor FET by a connection of a transistor or transistor and diode to the next stage of the FET. CONSTITUTION:By connecting transistor or transistor and diode to the next stage of the FET30, the voltage fall in the forward current between the base and emitter of the FET30 is doubled in the apparent value. Two transistors, each having the base-emitter forward current voltage fall of about 0.6v, are connected in series, so that the base-earth forward current voltage fall of the transistor seen from the base 31 becomes about 1.2v. Unless the output voltage vo33 of the FET30 does not exceed about 1.2v, the transistor 32 does not become conductive. Accordingly, the flame detecting circuit can operate stably irrespective of the irregularity of the FET30 and any change in the surrounding temperature. Further, said flame detecting circuit can detect the flame by a voltage lower than a conventional circuit, and in addition, is advantageous in that it is quite easy to connect to other functional circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10640180A JPS5731724A (en) | 1980-08-04 | 1980-08-04 | Flame detecting circuit operated by low voltage such as several volts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10640180A JPS5731724A (en) | 1980-08-04 | 1980-08-04 | Flame detecting circuit operated by low voltage such as several volts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5731724A true JPS5731724A (en) | 1982-02-20 |
Family
ID=14432658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10640180A Pending JPS5731724A (en) | 1980-08-04 | 1980-08-04 | Flame detecting circuit operated by low voltage such as several volts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5731724A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5997352U (en) * | 1982-12-17 | 1984-07-02 | 三國工業株式会社 | flame detection circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4823135B1 (en) * | 1970-05-28 | 1973-07-11 |
-
1980
- 1980-08-04 JP JP10640180A patent/JPS5731724A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4823135B1 (en) * | 1970-05-28 | 1973-07-11 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5997352U (en) * | 1982-12-17 | 1984-07-02 | 三國工業株式会社 | flame detection circuit |
| JPS643971Y2 (en) * | 1982-12-17 | 1989-02-02 |
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