POWER CONVERTER AND CONTROL METHOD THEREOF

摘要

A power converter is provided. A transformer includes a primary winding for providing a primary voltage according to an input voltage, a secondary winding for providing a secondary voltage according to the primary voltage and an auxiliary winding for providing a reflection voltage according to the secondary voltage. A first switch coupled between the primary winding of the transformer and a ground has a control terminal for receiving a first control signal. A second switch coupled to the secondary winding has a control terminal for receiving a second control signal. A controller provides the first control signal to switch the first switch, so as to control the transformer to provide the secondary voltage. The controller provides the second control signal to switch the second switch according to the first control signal and the reflection voltage, so as to provide an output voltage in response to the secondary voltage.