FR2441990A1 - Fluorescent tube firing circuit - has triac fired to draw DC heating current through tube electrodes and ceases operation once tube fires or fails - Google Patents
Fluorescent tube firing circuit - has triac fired to draw DC heating current through tube electrodes and ceases operation once tube fires or failsInfo
- Publication number
- FR2441990A1 FR2441990A1 FR7832534A FR7832534A FR2441990A1 FR 2441990 A1 FR2441990 A1 FR 2441990A1 FR 7832534 A FR7832534 A FR 7832534A FR 7832534 A FR7832534 A FR 7832534A FR 2441990 A1 FR2441990 A1 FR 2441990A1
- Authority
- FR
- France
- Prior art keywords
- tube
- triac
- fires
- draw
- fails
- 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
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/02—Details
- H05B41/04—Starting switches
- H05B41/042—Starting switches using semiconductor devices
- H05B41/044—Starting switches using semiconductor devices for lamp provided with pre-heating electrodes
- H05B41/046—Starting switches using semiconductor devices for lamp provided with pre-heating electrodes using controlled semiconductor devices
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
A firing circuit (7) for a fluorescent tube comprises a triac (TR) connected in parallel with the tube. The gate circuit of the triac (TR) includes a diac (d) controlled by a capacitor (C) which charges on each mains half cycle to the threshold voltage of the diac (d) and fires the triac (TR) to draw d.c. heating current through the tube electrodes. The charging resistor (R1) for the capacitor (C1) determines the firing angle of the triac (TR) which preferably is nonconductive over an effective angle of 90 deg.. Once the tube fires, a resistive divider (R1, R2) including the charging resistor prevents the capacitor charging to the triac firing voltage. A thermistor (10) may be connected between the tube and the triac (TR) such that if the tube fails to fire, the thermistor (10) heats up increasing its resistance and eventually rendering the firing circuit (7) inoperative.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7832534A FR2441990A1 (en) | 1978-11-17 | 1978-11-17 | Fluorescent tube firing circuit - has triac fired to draw DC heating current through tube electrodes and ceases operation once tube fires or fails |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7832534A FR2441990A1 (en) | 1978-11-17 | 1978-11-17 | Fluorescent tube firing circuit - has triac fired to draw DC heating current through tube electrodes and ceases operation once tube fires or fails |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2441990A1 true FR2441990A1 (en) | 1980-06-13 |
FR2441990B1 FR2441990B1 (en) | 1981-09-11 |
Family
ID=9215019
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7832534A Granted FR2441990A1 (en) | 1978-11-17 | 1978-11-17 | Fluorescent tube firing circuit - has triac fired to draw DC heating current through tube electrodes and ceases operation once tube fires or fails |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2441990A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0327404A1 (en) * | 1988-02-04 | 1989-08-09 | Century International Ltd. | Electronic ballast and starter circuit |
EP0437908A1 (en) * | 1989-09-07 | 1991-07-24 | Council of Scientific and Industrial Research | Electronic capacitive ballast for fluorescent and other discharge lamps |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1513017A (en) * | 1966-03-04 | 1968-02-09 | Ass Elect Ind | Power supply device for electric discharge lamps |
FR2041024A1 (en) * | 1968-11-20 | 1971-01-29 | Auco Nv | |
FR2373208A1 (en) * | 1976-12-01 | 1978-06-30 | Philips Nv | STARTER TO ANNOUNCE A DISCHARGE LAMP IN GAS AND / OR VAPOR |
-
1978
- 1978-11-17 FR FR7832534A patent/FR2441990A1/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1513017A (en) * | 1966-03-04 | 1968-02-09 | Ass Elect Ind | Power supply device for electric discharge lamps |
FR2041024A1 (en) * | 1968-11-20 | 1971-01-29 | Auco Nv | |
FR2373208A1 (en) * | 1976-12-01 | 1978-06-30 | Philips Nv | STARTER TO ANNOUNCE A DISCHARGE LAMP IN GAS AND / OR VAPOR |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0327404A1 (en) * | 1988-02-04 | 1989-08-09 | Century International Ltd. | Electronic ballast and starter circuit |
EP0437908A1 (en) * | 1989-09-07 | 1991-07-24 | Council of Scientific and Industrial Research | Electronic capacitive ballast for fluorescent and other discharge lamps |
Also Published As
Publication number | Publication date |
---|---|
FR2441990B1 (en) | 1981-09-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |