Fluorescent lamp electronic ballast circuit three

(3) The third circuit of fluorescent lamp electronic ballast circuit is shown in Figure 2-13. The inductor L and the capacitor Cs are the series resonant circuit at the output end, which determine the oscillation frequency (20~30kHz); C3 is the anti-interference capacitor; C4 is the DC blocking capacitor; the resistor Ri, the capacitor C2 and the bidirectional trigger diode VDi form a starting sawtooth transition Generator; the power filter transformer Tz is a radio frequency suppression component, used to eliminate the interference of electronic ballasts on radio equipment and pollution to the power grid; the resistor R6 is added in series to the c5 loop to eliminate the impact of instantaneous high voltage on the filament and extend the lamp tube service life.