From: firstname.lastname@example.org (Bob Wilson)
Subject: Re: Boosting output from 120V inverter
Date: Sun, 27 Oct 2002 02:29:30 -0000
Organization: Your Organization
X-Newsreader: WinVN 0.99.9 (Released Version) (x86 32bit)
References: <0001HW.B9DF7C5F00256614162B2870@news.covad.net> <email@example.com>
In article ,
>"Bevan Weiss" wrote in message
>> 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
>> trick, you'd have to replace the transformer as well, and the transformer
>> 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
>> > 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
>> > 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
>> > upgrade?
>> > The MOSFETS that switch the output are not heatsinked very well, and
>> > room for a small cooling fan.
>> > --
>> > Note that my return address is corrupted in an attempt to reduce spam.
>> > 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
Baloney! The transformers used in the typical low cost inverter (and I can
speak from experience here) are designed to run close to their saturation
limits. Push them harder (even if you cool them) and they start going into