I think "synchronous rectifier" is the proper term, someone correct me if I'm wrong.
You could use a MOSFET and a comparator (or op amp) on Vds to switch on Vgs. Diodes are not a part of it.
It's a bit harder than that, since when the MOSFET's on, Vds is ideally quite small but it is the only way you can determine when to shut off the gate to prevent the current from reversing. The offset inside the comparator is a big part of the issue.
Also MOSFETs have an inherent body diode inside them, thus they will conduct current as a diode when Vds < -0.7V. So you will need to use them in reverse so that the diode will only conduct in the normal direction of forward current, when the gate should be turned on anyways leaving it conducting fully.
This can be a very effective way to make an exceptional rectifier, but it's not a simple or cheap task. Are you SURE you need such a thing that badly? 1.4V of rectifier drop doesn't seem significant in a 200V system. Usually you'd use this if you were extremely serious about conserving power and/or deal with low system voltages where 1.4V of rectifier drop is a problem.