Published:2011/4/27 9:06:00 Author:Nicole | Keyword: switching power supply, single-junction transistor, pulse generator | From:SeekIC
In figure: VD1 ~ VD4 and C1 is rectifying filter circuit, turning 220V AC network voltage into 300V DC voltage. Pulse generator consists of an unijunction transistor VT1, resistors R3, R4, R5, potentiometer RP and capacitor C3, to change the potentiometer's resistance can lead to the changing of pulse frequency. C4 is the coupling capacitor of output pulse. Rl and R2 divide 300V DC voltage to unijunction transistor VT1 and provide 20 ~ 30V operating voltage. VT2 is the inversion amplifier tube, it can invert and amplify the positive pulse outputed by pulse generator, transporting a negative pulse to switch VT4, so that it is ended when VT1 outputs positive pulse.
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