The absolutely available switch power supply: Hitachi A1PM8C power supply

Published:2011/6/10 1:14:00 Author:Seven | Keyword: power supply, power supply | From:SeekIC

Oscillating process:After full-wave rectification, the 220V AC voltage is converted into a DC voltage of 300V on C906, and then the voltage is imposed on 3-pin of IC901 after it has run through the L1 coil of T901, in the meantime, the 220V is being half-wave rectified, then it is added to the 2-pin of IC901 by R942, R903 and R904, and the internal switch pipe of IC901 is starting to be conducting, besides, the current in L1 of T901 is rising, a positive feedback voltage in sensed in the coil L2, and this voltage is imposed on the 2-pin of IC901 by Q901, D905 and L907, so that the internal switch of IC901 is saturating quickly.During the time of saturating, on the one hand, L2 coil is charging C905 by R906 and R907.



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