Extending the life of an incandescent lamp. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
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This machine reduces the current surges through the lighting lamp at the moment it is turned on. When the contacts of the switch Q1 are closed, the EL1 lamp begins to glow half-heartedly, since the current flows through it only during the positive half-cycles of the mains voltage on the lower, according to the circuit, power wire. During the negative half-cycles, the capacitor C1 is charged. As soon as the voltage across the capacitor reaches the stabilization voltage of the zener diode VD2, the trinistor VS1 will open and the lamp will flash almost to full heat.
Fig. 1
The parts shown in the diagram are designed to operate the machine with a lamp (or lamps) up to 150 watts. For a more powerful load (500 ... 700 W), you need to install a VD3 diode with a permissible rectified current of 2 ... 3 A (for example, KD202L). In this case, the trihistor can not be installed on the radiator.
The machine is adjusted with the VD3 diode turned off. Instead of resistor R3, it is desirable to temporarily solder a variable with a resistance of 15 kOhm or 22 kOhm. A few seconds after the device is connected to the network, the EL1 lamp should light up with a flickering light. If there is no glow, the current of the control electrode of the trinistor is selected with a variable resistor. Then measure the voltage across the capacitor. If it exceeds 50 V, replace the capacitor with another one with a higher rated voltage or install a zener diode with a lower stabilization voltage.
After that, the VD3 diode is connected and the alternating voltage on the lamp is measured. You can change it in one direction or another by selecting the resistor R1, but it is undesirable to significantly reduce the resistance of the resistor compared to that indicated in the diagram, otherwise the duration of the preliminary heating of the lamp filament will decrease (it should not be less than 2 s) - until the trinistor is turned on.
Authors: Father and son Chumakov, Dzerzhinsk; Publication: cxem.net
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