The absolutely available switch power supply: Hitachi NP8C power supply

Published:2011/6/10 3:47:00 Author:Seven | Keyword: power supply, Hitachi | From:SeekIC

Oscillating process:The voltage of 300V is imposed on the B pole of pipe Q901 by R911,R907 and R908, then Q901 starts to conduct and the primary coil of T901 begins to have current, in the meantime, a sensing voltage is generated, the polarity of the upper part is positive and the lower part is negative, so that the coil also begins to generate a sensing voltage, and the polarity of upper part is negative and the upper part is positive, the voltage is delivered to B pole of Q901 by R902, R909 and C908, which makes Q901 more conducting, so the positive feedback makes Q901 saturate quickly. During the time of saturating, D906 and D907 are blocked and T901 is saving energy, at the moment, the positive feedback voltage is charging C908 continuously.



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