I would like to add reverse polarity protection to my robot. Supply is 320 VDC, 20 A max. The load is mainly inductive (DC brushless motors, some DC/DC converters).
A simple solution would be using a high-voltage power diode in series. The loss in efficiency wouldn't be much of an issue at such high voltages, but the thermal management will still make integration far more difficult.
For low voltages a P-MOS would provide the needed reverse polarity protection, but with a very small voltage drop (so low power dissipation). But as there are no PMOS which allow a 320 V gate voltage (as far as I know), this won't work.
I found ideal diode drivers (mainly designed for power ORing) that drive those MOSFETs even for higher voltages, but so far the highest I found is the LTC4357, but it is only specified for 80 V (100 V abs. max.).
What is the best way for reverse polarity protection for rather high voltages (320 VDC) and rather high currents (20 A)?
Note that both blocking reverse current or rectifying the reversed current are acceptable (I would prefer blocking), and that solutions involving blowing a fuse or other easily replaceable components are acceptable (reverse polarity is unlikely, but damage is very high if the robot gets destroyed). Cost is no big issue.