Synchronous rectifier

A synchronous rectifier is a circuit device in which the output rectifier diode of a power supply is replaced with an active switch such as a MOSFET. In contrast, rectification using a Schottky diode is called an asynchronous rectifier. This switch is turned on and off under control to perform the role of a rectifier, resulting in a significant reduction of losses in the output stage of the power supply and improved efficiency.