A drawback of the classic four-diode rectifier bridge is the unavoidable forward voltage drop (Vf) of two diodes when current is flowing. With conventional silicon diodes, this could typically amount to 1.5 volts or more. The result of this is wasted power and reduced efficiency in power supply applications.
We could eliminates this drawback by replacing the diodes with MOSFETS. This will be useful when we work on high current.