The LDS is battery powered. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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The LDS is battery powered. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur

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A fluorescent lamp (LDS) is powered by an alternating current - everyone knows this. And if there is no such network or, say, the electricity was turned off at the dacha? Yes, and in a car trip or a hike it would be nice to use such a lamp - more economical than an incandescent lamp. How to be?

The answer is simple - you need to assemble the voltage converter according to the proposed scheme (see figure). This is the so-called blocking generator. The excitation in it occurs due to the feedback between the collector and base circuits of the transistor due to the corresponding phasing of the windings of the transformer T1 included in these circuits. Resistor R1 sets the operating mode of the transistor.

LDS is battery powered

As a result, a pulsed high voltage appears on the upper winding according to the circuit (pins 9, 5), supplied to the fluorescent lamp EL1. Under the influence of impact ionization of the gas, the lamp begins to glow. Moreover, even a lamp with a burnt out filament (or filaments) will glow, but with a power of not more than 20 W, and not too worn out.

Transformer - horizontal TVS-110LA from a black and white TV. It will have to be finalized: disassemble, remove the high-voltage winding and the kenotron socket, and so that the transformer does not "squeak", lubricate the ends of the magnetic circuit with glue before assembly. Transistor - almost any powerful silicon npn or pn-p structure. In the latter option, you will have to change the polarity of the battery and capacitor. The transistor must be mounted on a heat sink with a surface area of 30 ... 50 cm2 or pressed to the aluminum strip of the transformer using a bracket.

The battery may be composed of four to six galvanic cells 373 for the camping option. In the case of a car trip or in summer conditions, you need to use a car or motorcycle battery. Then you can do without a capacitor.

The converter starts working almost immediately after switching on. The desired brightness of the lamp is set by selecting a resistor. However, it does not make sense to excessively reduce its resistance to obtain greater brightness, since the current drawn from the power source increases. This is especially true for the option of powering the converter from a battery of galvanic cells.

Author: A.Dmitriev, Podolsk, Moscow region

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