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From: email@example.com (Bob Wilson)
Subject: Re: Boosting output from 120V inverter
Date: Mon, 28 Oct 2002 00:58:14 -0000
Organization: Your Organization
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References: <0001HW.B9DF7C5F00256614162B2870@news.covad.net> <firstname.lastname@example.org>
In article ,
>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). If
>there is feedback that increases the drive when the output drops then yes
>may put the transformer into saturation. But that is usually determined by
>the input voltage.
>This is assuming a system with a separate oscillator and output stage, the
>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, which
is not used in any commercial products of any significance today.
The standard topology for cheap quasi-sine inverters uses a driven push-pull
that is driven with dead time between half cycles. The dead time reduces the
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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