Low Forward Drop Rectifier schematic

A
TMOS power FET , Q1 , and LM393 comparator provide a high efficiency
rectifier circuit. When Va exceeds Vb1 U1s output becomes high and Q1
conducts. Conversely, when Vb exceeds Va1, the comparator output
becomes low and Q1 does not conduct.

The
Forward drop is determined by Q1s on resistance and current I. The
MTH40N05 has an ON resistance of 0.028 Ω ; for I = 10 A , the forward
drop is less than 0.3V .Typically , the best Schottky diodes do not even
begin conducting below a few hundred mV.