Re: query - 2HP PM DC motor controller - pointers please

--- In CAD_CAM_EDM_DRO@y..., "Jan Kok" <kok@s...> wrote:

> How does one get 90VDC from 110VAC?

I have been wondering about this for a long long time...
The 90vdc drives that I have seen have no transformer, just SCRs.

I suspected half-wave rectification:
120*sqrt(2)~=170, and half of that is 85
(this is simplified, but it works out in RMS too)

But I understand that drawing DC from an AC power line is not a good
idea.

So how does it really work?

Tom Scarince
www.thsengineering.com