Ordinary transistor switching power supply circuit diagram

Published:2011/3/23 20:36:00 Author:Nicole | Keyword: transistor, switching power supply | From:SeekIC

Transistor switching power is widely applied, as shown, this is a circuit diagram. In the figure, the transformer T, diodes VD1 ~ VD4 and capacitor C5 form the rectifier filter circuit; resistors R7, R8 and R9 in series sampling circuit; transistor VT4 as the error amplifier; transistor VT2, VT3 composite component switching regulator; VT1 is the pulse width adjustment tube; VT1, VT2, VT3 and the R3, C8 form the self-oscillation circuit; resistor R6 and Zener diode VD6 form reference; VD5 is the freewheeling diode; L is the energy storage inductor; VD5, L and C12 component output filter; R5 and C10 form a loop, it can make the freewheeling diode VD5 has good recovery characteristics.



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