From: "Licensed to Quill"
Subject: Re: Boosting output from 120V inverter
Date: Mon, 4 Nov 2002 10:29:13 -0500
Organization: CompuServe Interactive Services
References: <0001HW.B9DF7C5F00256614162B2870@news.covad.net> <firstname.lastname@example.org> <0001HW.B9DFECA2002E26AD162B2870@news.covad.net>
NNTP-Posting-Date: Mon, 4 Nov 2002 15:32:13 +0000 (UTC)
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I have one of these units which I am trying to fix but substantially without
any real knowledge of how to do this.
The units seems to turn on and lights up but as soon as I try to get any
power out of it, the available power drops to about 1 milliamp. (Fuse not
blown though?) Is this a MOSFET problem or a transformer one?
Licensed to quill
"DaveC" wrote in message
> On Fri, 25 Oct 2002 23:03:30 -0700, Bevan Weiss wrote
> (in message <email@example.com>):
> > 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
> > 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
> 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
> 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
> But in any case, I think that cooling it as much as possible could only
> 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.
> Dave Carpenter
> Sound Logic
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