555 fluorescent group centralized rectification and start-up circuit

Published:2011/5/23 2:30:00 Author:TaoXi | Keyword: fluorescent group, centralized rectification, start-up circuit | From:SeekIC

This centralized rectification and start-up circuit can drive 10-20 cigarettes of fluorescent lights to work. It is composed of the step-down rectifier circuit, the passive stimulating type high-frequency push-pull oscilation circuit and the driving circuit, as the figure 17-64 shows. The multivibrator is composed of the time base 555 and the R2，R3，C3, the oscillation frequency f=1.44(R2+2R3)C3. The parameters of the figure's oscillation frequency is about 25kHz. The high-frequency pulse which is output by 555 adds to the primary stage of pulse transformer T1, the push-pull driving circuit is composed of the two secondary stages and the VT1，VT2，R4～R7.etc.



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