FR2410415A1 - Starting circuit for fluorescent lamp - has full power applied after heating filaments, by detecting lamp impedance - Google Patents

Starting circuit for fluorescent lamp - has full power applied after heating filaments, by detecting lamp impedance

Info

Publication number
FR2410415A1
FR2410415A1 FR7735905A FR7735905A FR2410415A1 FR 2410415 A1 FR2410415 A1 FR 2410415A1 FR 7735905 A FR7735905 A FR 7735905A FR 7735905 A FR7735905 A FR 7735905A FR 2410415 A1 FR2410415 A1 FR 2410415A1
Authority
FR
France
Prior art keywords
lamp
power applied
full power
impedance
starting circuit
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
FR7735905A
Other languages
French (fr)
Other versions
FR2410415B3 (en
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.)
SERA SA
Original Assignee
SERA SA
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 SERA SA filed Critical SERA SA
Priority to FR7735905A priority Critical patent/FR2410415A1/en
Publication of FR2410415A1 publication Critical patent/FR2410415A1/en
Application granted granted Critical
Publication of FR2410415B3 publication Critical patent/FR2410415B3/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
    • H05B41/14—Circuit arrangements
    • H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
    • H05B41/20—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch
    • H05B41/23—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode
    • H05B41/232—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode for low-pressure lamps
    • H05B41/2325—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode for low-pressure lamps provided with pre-heating electrodes

Abstract

The circuit powering a hot cathode lamp using a self-oscillating static convertor ensures heating of the filaments before application of the full voltage. The frequency applied to the lamp (5) is changed, when the lamp starts, by a circuit including the secondary of a transformer (4) coil (6) and capacitor (9). The impedance of the lamp, which is infinite while it is not working, affects the discharge of the capacitor through the secondary circuit, and thus controls the frequency applied to the lamp.
FR7735905A 1977-11-29 1977-11-29 Starting circuit for fluorescent lamp - has full power applied after heating filaments, by detecting lamp impedance Granted FR2410415A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7735905A FR2410415A1 (en) 1977-11-29 1977-11-29 Starting circuit for fluorescent lamp - has full power applied after heating filaments, by detecting lamp impedance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7735905A FR2410415A1 (en) 1977-11-29 1977-11-29 Starting circuit for fluorescent lamp - has full power applied after heating filaments, by detecting lamp impedance

Publications (2)

Publication Number Publication Date
FR2410415A1 true FR2410415A1 (en) 1979-06-22
FR2410415B3 FR2410415B3 (en) 1980-07-18

Family

ID=9198211

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7735905A Granted FR2410415A1 (en) 1977-11-29 1977-11-29 Starting circuit for fluorescent lamp - has full power applied after heating filaments, by detecting lamp impedance

Country Status (1)

Country Link
FR (1) FR2410415A1 (en)

Also Published As

Publication number Publication date
FR2410415B3 (en) 1980-07-18

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