555 Illuminations Group Centralized Rectification and Starting Circuit

Published:2011/7/20 5:38:00 Author:Sue | Keyword: Illuminations Group, Centralized Rectification, Starting Circuit | From:SeekIC

The centralized rectification and starting circuit can drive 10-20 illuminations to work at the same time. As seen in figure 17-64, it consists of voltage reduction, rectification, separate-excited high frequency push-pull oscillation. Time-base circuit 555 and R2,R3,C3 compose a multivibrator and its oscillate frequency is f=1.44(R2+2R3)C3. The parameter in the figure has an oscillate frequency of about 25kHz. 555's output high frequency pulse will be put on pulse voltage transformer's primary stage. Its two secondary stages and VT1,VT2,R4-R7 will compose push-pull drive circuit. The high frequency voltage's effective valueon the middle point O can reach as high as 140v which will turn on the illuminations. The criticalthing that can realise centralized rectification and starting are the high frequency voltage transformer T1's design and production. Its primary and secondary parameters will be shown in figure 17-64.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Power_Supply_Circuit/555_Illuminations_Group_Centralized_Rectification_and_Starting_Circuit.html

Print this Page | Comments | Reading(3)