Hitachi NP8C power supply circuit

Published:2011/8/31 20:54:00 Author:TaoXi | Keyword: Hitachi, power supply circuit | From:SeekIC

Oscillation process The 300V DC voltage adds to the B pole of the switch tube Q901 through the R911, R907, R908, so the Q901 starts to conduct, the current flows through the primary winding of the T901, the Q901 produces the induced voltage, also the primary winding produces the induced voltage too. The voltage adds to the B pole of Q901 through the R902, R909, C908 to make the further conduction of Q901, the strong positive feedback makes the Q901 saturate rapidly. In the saturated period of Q901, the D906 and D907 conduct, the T901 stores the energy, at the same time the positive feedback voltage charges the C908, so the voltage of the Q901's B pole is declining until the voltage can not maintain the saturation of Q901.



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