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High_wattage_lamp_control

2016-08-06 00:07  
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High_wattage_lamp_control
Many high-wattage incandescent lamps suffer shortened lifetimes when switched on at ac line voltages other than zero. This is because a large inrush of current destroys the filament. A simple solution to this problem is to use an optoisolator and triac, as shown. The triac must be capable of handling the lamp current. The MOC3041 optoisolator can be controlled from a switch or some form of 5-V digital logic. The minimum value of R is determined by the maximum surge current rating of the MOC3041 (ITSM), where: Rmin(pk) /ITSE; With a 230-V line, and a 1.2-A ITSM for the MOC3041, the minimum value of R is: 340 V/1.2A =283 Ω.