Fluorescent lamp electronic ballast circuit 9

(9) Fluorescent lamp electronic ballast circuit No. 9
    The circuit is shown in Figure 2-19. The operating frequency of the lamp circuit is mainly determined by L2 and C6. Adjust the inductance of the inductor so that the lamp current
is the rated value. Diodes VD3 and VD4 cause the filament to generate double hot spots to improve the working condition of the lamp. Sometimes these two tubes
can be omitted; resistor R2 and capacitor C4 form an output phase correction network, so that the current in the load loop is in
the same phase as the fundamental frequency voltage generated at the output end to improve the efficiency of the inverter.