Acbel Polytech Inc.

Ching-Feng Yang

Shun-Te Chang

A power converter with synchronous rectifying through the control of a current transformer is disclosed. The basic architecture of the power converter includes a flyback transformer ( ), a switch controller ( ) and a current transformer ( ). The secondary winding of the flyback transformer ( ) is connected to the primary winding of the current transformer ( ) used to control the switch controller ( ). The primary winding of the current transformer ( ) is connected to a synchronous rectifying switch (Q ). If a current change occurs on the secondary winding of the flyback transformer ( ), the current transformer ( ) detects the phase change and enables the switch controller ( ) to switch off the synchronous rectifying switch (Q ). The current transformer ( ) turns off the synchronous rectifying switch (Q ) anticipatorily in the continuous current output mode to prevent any power loss from crossovers.

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Keelung, Taiwan

Ching-Feng Yang