Introduction to the characteristics and working principle of the self-oscillation switching power supply circuit

Switching power supply is the basis for learning electronic technology, and it is also a must-learn basis for us to learn any electronic technology. The switching power supply is also composed of unit circuits. Among these unit circuits, the oscillation circuit is the main component of the switching power supply. Basic core circuit

a. Circuit composition

1) Starting circuit 2) Energy storage inductor (switching transformer) 3) Switching tube 4) Positive feedback circuit



b. And working principle analysis

1) Working principle of starting circuit 2) Working principle of switching tube and current analysis 4) Working principle of positive feedback circuit

• Chapter 1：Self-oscillation switching power supply circuit composition (6 minutes and 21 seconds)

• Chapter 2：How the startup circuit works (14 minutes and 17 seconds)

• Chapter 3：Working principle and current analysis of switching tube (13 minutes and 24 seconds)