Explain the principle of switching power supply and each functional circuit

Summary:

Power conversion circuit

The working principle of MOS tube: The most widely used insulated gate field effect transistor is MOSFET (MOS tube), which uses the electroacoustic effect of semiconductor surface to work. Also known as surface field effect devices. Since its gate is in a non-conducting state, the input resistance can be greatly improved up to 105 ohms. The MOS transistor uses the magnitude of the gate-source voltage to change the amount of induced charge on the semiconductor surface, thereby controlling the drain current. .

Common schematics:

Output rectifier filter circuit forward rectifier circuit: T1 is a switching transformer whose phase of the primary and secondary poles is in phase. D1 is a rectifier diode, D2 is a freewheeling diode, and R1, C1, R2, and C2 are sharp peak circuits. L1 is a freewheeling inductor, and C4, L2, and C5 form a π-type filter. See the upload document for details.