Olin Lathrop wrote:
> Isaac Marino Bavaresco wrote:
> >> The question I have is, what kind of switching power supply
> >> architecture would be recommendable to match lets say a 50V motor
> >> (BLDC or Asynchronous) which would be fed by a 300V Bank that cant
> >> really supply the max. power current of the motor?
> >
> > A buck step-down converter?
>=20
> You shouldn't need that.  A motor can be its own filter.  You can chop th=
e
> motor from substantially higher voltage than what it is intended to run a=
t,
> just make really really sure the duty cycle is low enough so that the
> average is right.  Put another way, you need a buck converter, but the co=
ils
> in the motor can be the inductor and the final load at the same time.

But the premise was that the battery couldn't supply the peak current direc=
tly,
so you'll need a VERY hefty capacitor in parallel with it (or better yet, a=
n
L-C low-pass filter between the battery and the switch) in order to handle =
the
ripple current.

-- Dave Tweed
--=20
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