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Hitachi NP8C power supply

2015-03-19 10:53  
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Hitachi NP8C power supply
The models using Hitachi NP8C power supply are: Hitachi CTP236, CEP320D, CRP350D, 450D, Furistock HFC-236, 450, Goldstar C37-401, C46-1, C563, etc. This power supply is widely used for early period color TV in China. Oscillating process 300V DC voltage is added to switching tube Q901's B pole through R911, R907 and R908. Q901 starts to break over. T901's primary winding has current, at the same time, it can generate induction voltage, its polarity is that up is positive and down is negative. So this stage winding also can generate induction voltage, the polarity is thatdown is positive and up is negative. This voltage is sending to Q901's B pole through R902, R909 and C908, and it can make Q9021 break over further, the strong positive feedback makes Q901 rapidly saturation.