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 fails

Info

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
Application number
FR7832534A
Other languages
French (fr)
Other versions
FR2441990B1 (en
Inventor
Liang-Ing Tchang
Jean Dolezon
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.)
Compagnie des Lampes
Original Assignee
Compagnie des Lampes
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 Compagnie des Lampes filed Critical Compagnie des Lampes
Priority to FR7832534A priority Critical patent/FR2441990A1/en
Publication of FR2441990A1 publication Critical patent/FR2441990A1/en
Application granted granted Critical
Publication of FR2441990B1 publication Critical patent/FR2441990B1/fr
Granted legal-status Critical Current

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.
FR7832534A 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 Granted FR2441990A1 (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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