Soft starter for incandescent lamps. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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Incandescent lamps are widely used in Tula in home incubators and balcony winter vegetable stores as heaters working with electronic thermostats, developed at one time by the local research and production company Alfa. The disadvantage of the device is well known - with frequent switching on of the lamps, which is observed on cold winter days, the filament quickly collapses and the lamps fail.
"Elektronovtsy" Anton Filonov and Vladimir Kovalkov designed an automatic machine that allows you to limit the starting current through the lamps and significantly increase their service life. The machine (Fig. 1) is a two-terminal network included in the break in the power wire of the lamps EL1, EL2. At the initial moment after applying voltage (by switch SA1 or by thermal relay contacts), capacitor C1 is not charged, therefore transistors VT1 and VT2, connected according to the compound transistor circuit, are closed. The lamps don't light up. As the capacitor charges, the transistors open smoothly, increasing current through the tubes. After 0,1 .... 0,15 s, the lamps will flash with full heat.
Instead of two transistors, it is permissible to use one composite series KT834 or KT848.
The machine is mounted in a plastic case (Fig. 2), which excludes the possibility of contact with current-carrying circuits.
Since they are galvanically connected to the lighting network, when designing, testing and setting up the machine, you must follow the safety rules
Author: Ponomarev L.D., Tula
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