Subject: Re: Boosting output from 120V inverter
Date: Sat, 26 Oct 2002 6:54:26 -0700
References: <0001HW.B9DF7C5F00256614162B2870@news.covad.net> <email@example.com>
User-Agent: Hogwasher/3.1 (Carbon/OSX)
On Fri, 25 Oct 2002 23:03:30 -0700, Bevan Weiss wrote
(in message <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.
Can I gain any increase by properly heatsinking the existing MOSFETs and
adding a cooling fan? The 2SK1221 is rated at 250V 10A 80W. My understanding
is that it will handle most of this if kept cool, and less when hot.
According to the data sheet, power handling capability of this device is 80W
at 25oC and derated - pretty much linearly - down to zero W at 100oC. At
about 50oC it can handle 50W, which seems like a reasonable temp to keep it.
But in any case, I think that cooling it as much as possible could only help.
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