| 摘要 |
PROBLEM TO BE SOLVED: To provide a synchronous rectification circuit that suppresses the generation of a ringing voltage in a secondary winding of a transformer even in a light load condition.SOLUTION: In the synchronous rectification circuit having two alternately driven converter blocks, and using a main switching driving signal and whether there is a secondary excitation voltage in the transformer of the other converter block in driving a synchronous rectification FET, at least either of the converter blocks includes a ringing voltage removal section arranged in series with the secondary side of the transformer which includes a rectification diode for rectifying only a current in a positive current and a switching element for short-circuiting and reducing a ringing voltage in a light load condition. |
