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From: "Kevin White"
References: <0001HW.B9DF7C5F00256614162B2870@news.covad.net> <firstname.lastname@example.org>
Subject: Re: Boosting output from 120V inverter
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
NNTP-Posting-Date: Mon, 28 Oct 2002 16:26:17 GMT
Organization: AT&T Broadband
Date: Mon, 28 Oct 2002 16:26:17 GMT
I agree that the traditional self-oscillating converter is is not used much
these days - that's what I meant by using the word "traditional".
Without feedback though (e.g changing the dead time to perform regulation)
increasing the load current will take the transformer away from saturation
not into saturation.
"Bob Wilson" wrote in message
> In article ,
> email@example.com says...
> >Well actually, increasing the load will take the transformer out of
> >The current in the secondary opposes the magentic field created by the
> >primary. (assuming a forward converter as I believe they usually are).
> >there is feedback that increases the drive when the output drops then yes
> >may put the transformer into saturation. But that is usually determined
> >the input voltage.
> >This is assuming a system with a separate oscillator and output stage,
> >traditional push-pull self-timed inverter always runs the transformer to
> >saturation anyway as part of its normal operation.
> >You may not be able to get much more out of the transformer because the
> >resistance and leakage inductance may be limiting the output power.
> The standard el-cheapo inverter most certainly NEVER pushes the
> transformer into saturation. You are referring to the Royer topology,
> is not used in any commercial products of any significance today.
> The standard topology for cheap quasi-sine inverters uses a driven
> that is driven with dead time between half cycles. The dead time reduces
> possibility of core walking (by allowing some time for residual field to
> discharge into the load between each half cycle).
> Push any inverter of this topology too hard, and the core can saturate.
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