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VFD with DC input for electric vehicle

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Animesh Shaw

New Member
VFDs for AC motor control are common items. 3 phase AC motors are everywhere, easy to find used, last forever, and are very inexpensive for their HP rating.

The VFD drives I have seen all take AC input, 1 phase or 3 phase. Since the AC gets converted into DC inside the drive, it would *seem* that DC input versions would be easy (hah!) to convert from existing units, or should be cheaper to buy (due to fewer parts) than the original AC input versions.

Does/has anyone know/tried this or have any other information?

What would be ideal is if the VFD drive would send power back to the DC bus during regeneration instead of dumping it into load resistors, but I doubt that is possible circuit for the same.
 

MaxHeadRoom78

Well-Known Member
The majority of VFD's do have a 3 phase bridge at the R,S,T, input so it is possible to feed from sufficient voltage DC, there are a few that do take power from two phases to feed a 1phase power for the low voltage circuits, Mitsubishi is one that has adopted this practice in the past.
Max.
 
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