Could be dynamic braking for a 3 phase AC motor?  I've done that...rectify the 120VAC, use a large metal encased power resistor for current limit and apply across two legs of the motor to stop it.  I used relays, interlocked with the motor contactor (you dont wanna know what happens if you tie the DC while 480VAC is present)


--- On Wed, 7/30/08, Marc Nicholas <geekything@gmail.com> wrote:

> From: Marc Nicholas <geekything@gmail.com>
> Subject: Re: [EE]: Solid-state relays for DC applications
> To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> Date: Wednesday, July 30, 2008, 6:35 PM
> Okay, I'll bite: why the heck 120VDC @ 10amps?! :)
> 
> -marc
> 
> On Wed, Jul 30, 2008 at 9:21 PM, Gustavo Aguayo
> <gus_aguayo@yahoo.com>wrote:
> 
> > Hi everybody!
> > Could anybody provide me an schematics, an Appl. Note
> or a link,of a
> > Solid-state relay which could be used in a 120VDC-10 A
> application?I have in
> > mind a SSR employing N-channel MOSFETs (IRF740), but I
> would liketo compare
> > its performance with some other diagrams before really
> implementing it on
> > the final design (not a commercial one...) Thanks so
> much in
> > advance, Gustavo Aguayo
> >
> >
> >
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