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SANYO 80P power supply circuit

2015-03-22 09:06  
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SANYO 80P power supply circuit
Oscillation process The 300V DC voltage adds to the B pole of the switch tube Q504 through the R518, R519, the Q504 starts to conducts. The pin-9 and pin-10 of the T501 are the positive feedback winding, the pin-9 has the positive polarity and the pin-10 has the negative positive polarity, the voltage gets through the positive feedback which is composed of the B, E poles of Q504, the R516, R515 and D509 to make the Q504 saturate rapidly. After the Q504 is saturated, the primary winding current of T501 increases linearly, this current produces the sawtooth wave voltage-drop on the R514, the voltage-drop adds to the B pole of Q502 through the R505 and C507, the sawtooth wave voltage is superimposed on the 6.8V DC voltage of the B pole of the Q502, when the B pole voltage of Q502 is lower than a set value, the Q502 conducts to make the left port of C510 connect with the ground.