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Jinxin TDA two chip system power supply

2014-11-22 08:43  
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Jinxin TDA two chip system power supply
This power supply is also known as X53P power supply or X56P power supply. Taking Jinxing C498 for example, we simply introduced the principle of working. Oscillating process About 300V DC voltage on C708 adds to B pole of switching tube V720 by R729, R731 and L711. V720 starts to turn on. C pole's current is enlarging. T705's pin 1 and 12 generate induced electromotive force. Its polarity is that 1 is positive and 12 is negative. The positive feedback winding also generates negative induced voltage. Its polarity is 10 is positive and 9 is negative. This feedback voltage is added to B pole of V720 by C713, V713 and R713. It can make V720's current increase. Looping like this can make V720 saturation rapidly. Voltage regulation process Voltage regulation circuit consists of V745 and peripheral components. The sampling winding is T705's 7 and 8 winding. The voltage passes through V741 rectifying and C745 filtering. The voltage on C745 reflects the size of output voltage. If output voltage is increasing, the voltage on C745 is increasing too.