Inrush current limiter when an incandescent lamp is turned on. Scheme, description

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Inrush current limiter when an incandescent lamp is turned on. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Lighting

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The device, assembled according to the scheme shown in Fig. 1, delays the supply of full mains voltage to the lamp by approximately 0,2 s - the duration of charging the capacitor installed in it. This is quite enough to effectively limit the inrush current through the cold coil of the lamp. The residual voltage drop across the limiter is about 5 V.

Inrush current limiter when turning on an incandescent lamp
Fig. 2

Initially, several copies of the limiter were assembled using MLT-0,5 resistors, a KT940A transistor, a KD105B diode, and a KU208G triac. In the future, I switched to small parts, the types of which are indicated in the diagram, and lower power resistors, including those intended for surface mounting. This version of the limiter can be mounted on the printed circuit board shown in fig. 2.

With an EL1 lamp power of more than 100 W, the MAC97 triac must be replaced with a more powerful VT137 or VTA12-600. If such a thyristor is provided with a heat sink, and instead of the MJE13001 transistor, an MJE13003 is installed, the permissible load power will reach 2 kW. Capacitor C1 can be increased to 470 microfarads.

All manufactured limiters have been working flawlessly for more than three years.

Author: E. Shtepenko, Severodonetsk, Luhansk region, Ukraine; Publication: radioradar.net

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