China manufacturer of magnetic ballasts for metal halide flood lights & hps flood lights

Preheat start-type electronic ballasts, based on control of the voltage across the lamp to rise rapidly to achieve preheat start lighting the lamp, that is, when the voltage of the induction coil end up jumped, the by bidirectional voltage suppression controlfirst charging circuit in the internal charging circuit, and With Zener diode conduction, the control transistor is turned on, let the Vice transistor appropriate advance conduction leaving the main transistor timely deadline in order to be able to effectively control the energy of the filament load suppressing the high voltage across the lamp lighting rapidly jumped, thus preheat electronic ballasts, save power and avoid filament quickly damaged, and to extend the life of the lamp.