The second life of a fluorescent lamp. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Electrician

The second life of a fluorescent lamp. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Lighting

If luminaires with fluorescent lamps are used to illuminate the house, then it must be borne in mind that their cost (compared to incandescent lamps) is significant. And although fluorescent lamps last a long time, the need to replace them from time to time still arises. To extend the life of fluorescent lamps and even give a second life to lamps with a burnt out filament, a choke-free circuit for connecting them to the mains supply will help (Fig. 105).

The second life of a fluorescent lamp
Rice. 105. Scheme of mains supply of a fluorescent lamp with burnt out filaments.

It should be noted that the characteristics of all elements of the proposed circuit depend on the power of the lamp itself. These characteristics are given in table. 10.

The second life of a fluorescent lamp

A circuit of diodes VD1 and VD2 with capacitors C1 and C2 is a full-wave rectifier with double the voltage; in this case, the capacitances of the capacitors determine the value of the voltage supplied to the electrodes of the HL1 lamp (the dependence is direct: the larger the capacitance, the higher the voltage).

At the moment of connection to the mains supply, the voltage pulse at the output of the rectifier reaches 600 V. The combination of diodes VD3 and VD4 with capacitors C3 and C4 further increases the ignition voltage, bringing its value to approximately 900 V. At this voltage, a glow discharge between the lamp electrodes occurs even in the absence of filaments. (Capacitors C3 and C4 have another function - they dampen radio interference that occurs during an ionization discharge inside the glass tube of the lamp).

The lamp lit up, its resistance decreased, therefore, the voltage on the lamp electrodes also decreased, which ensures its normal operation at a voltage of about 220 V (a common indicator for household electrical networks). The operating voltage for the lamp is determined by the value of the resistor R1.

In principle, the circuit of diodes VD3 and VD4 and capacitors C3 and C4 can be excluded from the circuit, but in this case, the starting reliability of the lamp (ignition reliability) is reduced.

To draw up such a scheme, you will need the following radio components:

- as capacitors C1 and C2, paper or metal-paper capacitors of the type MBG, KBG, KBLP, MBGO or MBGP are used, designed for a voltage of 600 V;

- capacitors C3 and C4 can be of the KSG, KSO, SGM or SGO type (with mica dielectric). They must be designed for an operating voltage of at least 600 V;

- resistor R1 - wire, its power must correspond to the power of the switched on lamp; you can use resistors such as PE, PEV, PEVR;

- if there are diodes of the D205 or D231 brands in the circuit (when connecting lamps with a power of 80 or 100 W), then they should be installed on radiators (for heat removal).

The described scheme for connecting a fluorescent lamp to the mains supply not only does not have a bulky choke and an unreliable starter, but also ensures that the lamp turns on without delay, its silent operation and the absence of unpleasant blinking.

Such devices, designed according to the proposed schemes, usually do not gather dust in closets and attics, but take their rightful place in the electrical network at home or in a tool box.

Author: Korshevr N.G.

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I tried this circuit, the resistor R1 boils simply. It works for a while, maybe even a few weeks, and then it burns out altogether. often knocks out diodes, the weakest point, even D226. in general, the scheme is nothing, but if around the clock then at the temperature limit. Needs improvement.

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