The absolutely available switch power supply: Hitachi NP84C power supply

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

Oscillating process: The DC voltage of about 300V is imposed on the B pole of pipe Q901 by R902, R903 and C905, then Q901 starts to be conducting, then the current on C pole flows through the 1- and 3-pin of the T901 primary coil, a sensing EMF is generated and coupled with the 5- and 10-coil, which generates a sensing voltage that the upper is positive and the lower is negative, the voltage is delivered to B pole of Q901 by R905, C911, R906 and C908, so the current of Q901 is magnified further, the positive feedback makes Q901 saturated and conducting quickly. During the time of saturating, the current in 1- and 3-pin of T901 is rising linearly.



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