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?
>
> You shouldn't need that. =A0A motor can be its own filter. =A0You can cho=
p the
> 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. =A0Put another way, you need a buck converter, but the =
coils
> in the motor can be the inductor and the final load at the same time.

I am not sure what duty cycle are you talking about. The motor coils
operate in continuous current mode. To do so you need to switch a coil
from 0 to 300V to let it "suck" extra current from ground. The specs
may feel bad about high frequency 300V signal on 50V DC motor coils
(isolation).

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