Fluorescent lamp electronic ballast circuit 4

(4) The fourth circuit of fluorescent lamp electronic ballast circuit is shown in Figure 2-14. The inductor L4, capacitors C5 and C6 are the series resonant circuit of the output end, which determine the oscillation frequency (20~30kHz); C4 is the DC blocking capacitor; the resistors Ri, Rz, capacitor C2 and the bidirectional trigger diode VD form a starting sawtooth wave to generate The power filter transformer T and the inductor Li are radio frequency suppression components used to eliminate the interference of electronic ballasts to radio equipment and pollution to the power grid.