Features of the use of fluorescent lamps. Scheme, description

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Features of the use of 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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Fluorescent lamps (hereinafter referred to as LL) have different emission spectra and higher efficiency, approximately 2,5 times greater than that of incandescent lamps. Lack of l.l. - a greater coefficient of pulsation of the luminous flux, about 5 times greater than that of incandescent lamps. This factor limits the use of L.L. [5] for general lighting only.

If there are problems with the ignition of the l.l. or the filaments are burned out, it is advisable to connect in series with the starter a circuit of a series-connected capacitor with a capacity of 2 microfarads × 400V (with a discharge resistor 1MΩ 0,5W), and a 100Ω 2W resistor that limits the current through the starter, and short-circuit the burned-out filaments. This was proposed [1] by A. Shirochenkov.

You can use electronic ignition l.l., replacing the starter with it. It was first suggested [2] by Eng. Kharizomenov. His circuit consisted of two classic voltage doublers connected in parallel at the input and in series at the output, while L.L. included in the DC circuit of the voltage quadrupler. If you turn on in series with l.l. [3] one or two chokes, it is possible to reduce the luminous flux pulsation factor to 10...5%, which is commensurate with the luminous flux pulsation of incandescent lamps.

When eating l.l. direct current will be observed, after a while, the uneven glow of the gas in the lamp (gas column electrophoresis). This problem is solved by changing the polarity of turning on the lamp with a toggle switch, which is acceptable at home.

The most optimal scheme [4] was proposed by Suchinsky A.G. (Fig. 1).

Features of the use of fluorescent lamps
It is a pulsed voltage quadrupler. Capacitor C1 is charged up to 300V, and C4 up to 600V. The mains voltage is added to the voltage on the capacitors C1 and C4 and is applied to the EL1 lamp (up to 1200V per pulse). After the lamp is ignited, through the decoupling diodes VD2 and VD4, the load (ballast) is connected: capacitor C2 or choke from l.l. appropriate power.

The value of the capacitor C2 (μF) \u0,1d 1Rl.l. (W) (where Rl.l. - power l.l.). Capacitors of any type (do not forget about the permissible reactive power of capacitors). A smoothing inductor L10 from L.L. is connected in series with the lamp. of the corresponding power (preferably two chokes in series), to reduce the pulsation coefficient of the light flux l.l. up to 5...1%. Toggle switch SAXNUMX change the polarity of switching on l.l. when an uneven glow of the gas column appears.

The scheme does not need to be adjusted. With an ignition problem, l.l. it is necessary to check that the capacitor C4 is charged up to 600V, and C1 and C3 up to 300V in the absence of a lamp (use a tester with an input resistance of at least 20 kOhm / V).

Literature

Shirochenkov. Use for free. // Technique - youth No. 2, 1996, p. 23.
Eng. Kharizomenov. Fluorescent lamp - a second life. // Technique - youth No. 11, 1973, p. 28.
A. Khalatyan. Supply of fluorescent lamps. // VRL, issue 67, 1977, p. 33...38.
A.G. Suchinsky. Extending the life of a fluorescent lamp. // VRL, 1992, issue 116, p. 26...30.
G.N. Gohlin. gas-discharge light sources. M.-L. -: Energy, 1966, 550 p.
V.G. Bastanov. A fluorescent lamp with burnt out filaments becomes eternal. // 300 practical tips. Moscow worker, 1989, p. 181 - 182.

Author: Alexander Suchinsky villy_59@mail.ru; Publication: radioradar.net

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