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Separate excitation switching regulated power supply 2

2015-03-19 03:01  
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Separate excitation switching regulated power supply 2
The diagram is theseparate excitation switching regulated power supply circuit which uses single-junction transistor as pulse generator. VDl ~ VD4 and C1form rectifier filter circuit, it can change 220V AC mains voltage into 300V DC voltage. Pulse generator consists of single junction transistor VT1, resistors R3, R4, R5, potentiometer Rp and capacitor C3. And changing the resistance of the potentiometer Rp can change the pulse frequency. C4 is coupling capacitor of output pulse. R1 and R2 can divide 300V DC voltage and send 20~30V working voltage of single junction transistor VT1. VT2 is inverting amplifier tube. It can invert andamplify positive polarity pulse output by pulse generatorand send negative polarity pulse to switching tube VT2, it can make itself cut off when VT1 outputs positive polarity pulse. VT3, R7, C5 make up protection circuit of switching tube VT4.