Fluorescent lamps. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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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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Widely used fluorescent lamps are not without drawbacks: during their operation, the buzz of the throttle is heard, the power system has a starter that is unreliable in operation, and most importantly, the lamp has a filament that can burn out, due to which the lamp has to be replaced with a new one.

Fluorescent lamps

On fig. 1 shows a scheme that eliminates the listed disadvantages. There is no usual buzz, the lamp lights up instantly, there is no unreliable starter, and, most importantly, you can use a lamp with a burnt filament.

Capacitors C1, C4 must be paper, with an operating voltage of 1,5 times the supply voltage. Capacitors C2, C3 are desirable to be mica.

Resistor R1 must be wire-wound, according to the lamp power indicated in the table.

Table 1
Lamp power C1-C4 C2-C3 D1-D4 R1
Tues uF pf Om
30 4 3300 D226B 60
40 10 6800 D226B 60
80 20 6800 D205 30
100 20 6800 D231 30

Diodes D2, D3 and capacitors C1, C4 represent a full-wave rectifier with voltage doubling. The values of the capacitances C1, C4 determine the operating voltage of the lamp L1 (the larger the capacitance, the greater the voltage on the electrodes of the lamp L1). At the moment of switching on, the voltage at points a and b reaches 600 V, which is applied to the electrodes of the L1 lamp. At the moment the lamp L1 is ignited, the voltage at points a and b decreases and ensures the normal operation of the lamp L1, designed for a voltage of 220 V.

The use of diodes D1, D4 and capacitors C2, C3 increases the voltage to 900 V, which ensures reliable ignition of the lamp L1 at the moment of switching on. Capacitors C2, C3 simultaneously contribute to the suppression of radio interference.

Lamp L1 can work without D1, D4, C2, C3, but the reliability of switching on decreases.

The data of the circuit elements, depending on the power of the fluorescent lamps, are given in the table.

Literature:

V.G.Bastanov. 300 practical tips. Moscow worker, 1986.

Publication: N. Bolshakov, rf.atnn.ru

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