Subject: Re: Choosing the right transformer
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Date: Sun, 19 Jan 2003 13:45:22 -0500
NNTP-Posting-Date: Sun, 19 Jan 2003 13:48:05 EST
I am not quite sure i get the whole feedback idea... Why would we try to
close the loop around the modulator? That does not make any sense to me.
The actual "amplifier" is the class D analog circuit (the H bridge), if
there are any feedback to be put in this design, shouldn't it be between the
output of the H bridge and the input of the H bridge, NOT the input of the
modulator. Or am i just missing something?
"Chuck Simmons" wrote in message
> Greg wrote:
> > > ** Normally the supply voltage ( with all its ripple) is fed into
> > > feedback loop to correct for this problem - is there no way you can do
> > this
> > > ?
> > The modulator is implemented in a dsp so I don't see how the supply
> > could be fed back...
> > Greg
> It is clumsy and expensive but it can be done with an A/D converter for
> the feedback. After all, the most common use of DSP's is probably
> feedback systems. Most of these applications, though, are 10 or 12 bit
> and not suited to audio. Oh, the feedback would be from the filtered
> output rather than the power supply (technically, using the power supply
> voltage to correct is called anticipation or feed forward).
> ... The times have been,
> That, when the brains were out,
> the man would die. ... Macbeth
> Chuck Simmons firstname.lastname@example.org