Hitachi NP84C power supply circuit

Published:2011/8/31 21:08:00 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 R902, R903, C905, so the Q901 starts to conduct, the current of the C pole flows through the pin-1 and pin-3 of the primary winding of the T901, the Q901 produces the induced voltage, also the pin-5 and pin-10 of the primary winding produces the induced voltage too. The voltage adds to the B pole of Q901 through the R905, C911, R906, C908 to make the further conduction of Q901, the strong positive feedback makes the Q901 saturate rapidly. In the saturated period of Q901, the winding current of the T901's pin-1 and pin-3 increases to build the 110 V DC voltage on C909. At the same time, in the saturated period of Q901, the C911 is charged constantly to make the B pole voltage of Q901 become smaller, at last the Q901 exits the saturated state.



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