From: firstname.lastname@example.org (N. Thornton)
Subject: Re: Boosting output from 120V inverter
Date: 26 Oct 2002 10:41:45 -0700
References: <0001HW.B9DF7C5F00256614162B2870@news.covad.net> <email@example.com>
NNTP-Posting-Date: 26 Oct 2002 17:41:46 GMT
"Bevan Weiss" wrote in message news:<firstname.lastname@example.org>...
> It's not that simple unfortuneately...
> The transformer itself probably wont be rated that much above what the
> entire inverter is rated at. So just replacing the MOSFET's wouldn't do the
> trick, you'd have to replace the transformer as well, and the transformer is
> almost the entire cost of an inverter, apart from design.
> "DaveC" wrote in message
> > 200W inverter needs to run a bit more power. I know how cheap these things
> > are, but I get my kicks from using and/or modifying what I have and
> > the experience of electronics theory/application.
> > How should I go about matching up a higher-amperage MOSFET to replace the
> > ones there? Same g-d and g-s voltages? Higher d current? Pin
> > of course. What are the critical specs I should focus on when looking for
> > upgrade?
> > The MOSFETS that switch the output are not heatsinked very well, and there
> > room for a small cooling fan.
> > --
> > Note that my return address is corrupted in an attempt to reduce spam. If
> > choose to e-mail me, please correct my address as described below.
> > Thanks,
> > Dave
I think it could work actually, with a fan. Transformers will handle
much more power when fan cooled. So I'd put as powerful a fan in there
as you can squeeze, uprate your fets, and watch the TF temp to see
what it'll manage continuous. Hopefully you'll get a significant
Since youre running off battery, you'll want to power the fan
If you're real determined, theres always the outer edge option of
putting the TF in a well heatsunk tin full of oil - no fan power then.