Switching regulated power supply circuit of Zhonglong-ZL-2801A DVD player

Switching regulated power supply circuit of Zhonglong-ZL-2801A DVD player

Shown is the switching regulated power supply circuit of Zhonglong ZL-2801A DVD player . It is mainly composed of AC input circuit, rectifier filter circuit, switching oscillation circuit, switching transformer Tl, secondary rectifier filter and voltage stabilizing circuit. .     1. AC input     circuit The AC input circuit is composed of power switch S, fuse Fl, mutual inductance filter LF and filter capacitors Cl, C2, etc. Its function is to filter out interference and noise in the AC input signal.     2. Rectifier filter circuit The     220 V AC voltage is filtered and processed by a bridge rectifier circuit composed of bridge rectifier stacks D1~D4 and filter capacitor C3, and then a DC voltage of about 300 V is output and sent to the ① pin of the switching transformer TI.