Preheat starter for electronic ballast


Posted on Mar 9, 2013

The design usually involves a compromise between turn-on voltage and lamp life because the two are inversely related. One way to reach a reasonable compromise is to initially allow a momentary inrush current to warm the filaments, followed by a series of interrupted short circuits across the lamp that generate the required high voltage to trigger the fluorescent. With a preheated filament, the necessary strike potential reduces to half.



The trigger circuit in Figure 1 controls the electronic switch across the bulb. At start-up, IC1D`s output is low as C1 and C2 charge toward VCC. IC1D`s low output pulls IC1C`s inverting input low, which causes VO to clamp high. A high leve




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