Re: SMPS with two control loops
- From: "Yzordderrex" <yzordderrex@xxxxxxxxxxx>
- Date: 28 Nov 2005 06:28:47 -0800
Sounds like you are using the transformer injection scheme and
measuring the phase relationship one side relative to the other.
HP used to produce a very nice gain phase analyzer and they are only a
couple hundred bucks used on Epay. Dean Venable used to have a bunch
of decent app notes regarding making the measurements with this HP gain
phase analyzer.. Since his company (ex company?) began producing the
phase measurement gear his app notes were revised and only mention his
gear.
Ken's suggestion of DSO avaraging is good way. Switching noise is
avaraged out. You might need an expensive scope to get there tho.
Build yourself a pair of LC filters in a box having the same exact
response. Send signals from both sides of transformer thru it's own
filter and then when they come out the high frequency noise is gone but
the phase and gain information is still valid.
regards,
Bob
.
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