Hitachi A1PM8C power supply circuit

Published:2011/8/29 2:42:00 Author:TaoXi | Keyword: Hitachi, power supply | From:SeekIC

The oscillation process The 220V AC voltage is fully rectified by the circuit to produce the 300V DC voltage on C906, and this DC voltage adds to the pin-3 of the IC901 through the L1 winding resistor of T901, at the same time the 220V voltage is half-wave rectified by the circuit and the voltage adds to pin-2 of IC901 through the R942, R903, R904, the internal switching tube of IC901 conducts, the current of L1 of the T901 increases, the winding resistor L2 produces the positive feedback voltage, this voltage adds to the pin-2 of the IC901 through the Q901, D905, L907, so the internal switch tube of IC901 saturates quickly. During the switch turn-on period, the winding resistor L2 charges the C905 through the R906 and R907, and it charges the C909 through the R909, the charging result of the C909 is the electric potential decreasing of the pin-1 of IC901.



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