Patent ID: 6961256

Claim:
A synchronous rectifier with dead time adjusting function, connected to a secondary side of a transformer, a capacitor, an output power source and a first electric switch, comprising: a rectifying circuit connected to a secondary side terminal of a transformer and rectifying an alternating voltage of the secondary side terminal into a positive half-cycle voltage; a charging circuit connected to the rectifying circuit and producing a first charging voltage and a second charging voltage; a regulated power circuit connected to the charging circuit and receiving the first charging voltage to produce a reference voltage; a trigger circuit connected to the rectifying circuit and the charging circuit for generating a pulse signal, wherein a dead time adjusting comparing signal is output by the pulse signal and the second charging voltage; a comparing circuit connected to the regulated circuit, the charging circuit, and the trigger circuit, wherein the comparing circuit compares the dead time adjusting comparing signal with the reference voltage to produce a dead time adjusting signal; and a logic circuit connected to the comparing circuit and the rectifying circuit, wherein the logic circuit performs an AND logic operation with the dead time adjusting comparing signal and the positive half-cycle voltage to output a first driving signal for controlling on/off states of the first electric switch.