Fluorescent lamp electronic ballast circuit 12

    (12) The twelve circuits of the fluorescent lamp electronic ballast circuit are shown in Figure 2-22. This electronic ballast is used for 9~11W H-shaped fluorescent lamps . The power consumption of the ballast itself
is <0. 5w, and it has the characteristics of no flicker, no noise, low voltage (minimum 85V), one-time fast start, stable brightness, and
high power factor (0.97).
    The switching power transistors VTi and VTz should be paired and BV is required. . . ≥350V, BV. . . ≤2V; the trigger voltage of the bidirectional trigger diode
is about 32V, which requires consistent characteristics at both ends; the withstand voltage of capacitors C3~C5 should be greater than 250V.