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

Series resonant the electronic ballasts filament preheating control circuit, the ballast inverter drive output terminal connected to the series resonant circuit L1, C1, L1, C1 between series with a filament transformer, the secondary winding of the filament transformer and lampfilament pin is connected to a switching circuit in parallel, the primary coil of the filament transformer, the lamp connected in parallel to the filament transformer primary coil connected in series between the resonance capacitor C1, and by grounding DC blocking capacitor C2, in the fluorescent lamp filament pre-end, lamp normal working after the primary winding of the filament transformer is switching circuit bypass, the filament power is no longer provided. The switch of the lamp, long life, low power loss, high energy efficiency.