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 rectification using a Schottky diode, it is called an asynchronous rectifier. This switch turns on and off under control and serves the role of a rectifier; as a result, losses in the output stage of the power supply are significantly reduced and efficiency is improved.