Power supply circuit for fluorescent lamps. Scheme, description

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Power supply circuit for fluorescent lamps. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Lighting

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This circuit does not require a filament in the lamp

Power supply circuit for fluorescent lamps

L1 - 25W
C1, C2 - 0,1-1uF
D1, D2 - KTs405 or any similar diodes and assemblies.

Second scheme

Power supply circuit for fluorescent lamps

This switching circuit differs from the standard one in that a diode assembly is added to it, which allows you to get rid of the lamp flickering effect and reduces its ignition time.

Third scheme

Power supply circuit for fluorescent lamps

More promising are starterless ignition devices, where filaments are not used for their intended purpose, but act as electrodes of a gas discharge lamp - they are supplied with the voltage necessary to ignite the gas in the lamp.

This circuit is designed to power lamps with a power of more than 40 watts. Here, the bridge rectifier is made on diodes VD1-VD4. And the "starting" capacitors C2, C3 are charged through thermistors R1, R2 with a positive temperature coefficient of resistance. Moreover, in one half-cycle, the capacitor C2 is charged (through the thermistor R1 and the diode VD3), and in the other - C2 (through the thermistor R4 and the diode VD1). Thermistors limit the charging current of capacitors. Since the capacitors are connected in series, the voltage across the ELXNUMX lamp is sufficient to ignite it.

If the thermistors are in thermal contact with the bridge diodes, their resistance will increase when the diodes are heated, which will reduce the charging current.

Power supply circuit for fluorescent lamps

This option, unlike the one just considered, is somewhat better for powering high-power lamps, since quadruple of the mains voltage is applied here.

C1 - 8uF-400v
C2, C3 - 0,5uF-300V
C4, C5 - 0,01uF-750V
R1, R2 - ST15-2
R3 - 1MΩ, 0,5W
VD1-VD6 - KD243G
Dr1 - 1UBI80
EL1 - 40-80W

Notes

If you have assembled the circuit and it does not work, then change the polarity of the starter.
To facilitate the ignition of the lamp, an annular foil rim is glued to one end of its cylinder, connected by a conductor to the terminals of the opposite end.

Publication: cxem.net

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