Re: Bullet-Proof G201 / G210

Mariss,

I don't use 201, instead I use 320s, but in either case does size
matter? Compared to the rest of the components that go to make up
the power part of the system the controllers are tiny. This is one
case where I feel bigger is better. A major frustrations I had was
trying to get reasonable size power wire into the terminals with a
470uF cap, difficult when new a real PITA if they ever have to be
refitted.

If you were to ever upgrade the 32xs to 200 V I would be one of your
first customers.

Bernard

> Terry,
>
> The problem there is the MOSFETs. We use IRF530s which are 100V
> rated, the next size up is 200V. The physics of MOSFETs is if the
> voltage doubles then the "on" resistance quadruples, meaning the

chip

> size must quadruple in order to get the same "on" resistance.
>
> That requires a much larger TO-247 package, blowing the whole thing
> out of the water. Furthermore, many motor mfgs. now rate their

motors

> with a maximum operating voltage, usually around 65V.
>
> Mariss
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "James Owens"
> <wotisname@l...> wrote:
> > Hi Mariss,
> >
> > If this is a complete redesign why not up the max Voltage to

about

> 100?
> >
> > Regards,
> >
> > Terry
> >
> > > > This is a "clean sheet" redesign so now is the time for it.