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In Reply to: RE: Great Post !!!! posted by drlowmu on January 09, 2015 at 15:07:21
Hi again Jeff,
>>> the drop in the first 50 mS. is GOOD to be sharp and get "most" of the settling done smoothly and quickly as possible. <<<
I dunno, isn't the speed of the drop that only part of what matters? I would have thought the *magnitude* of the drop against time would also be an important aspect (wanting to keep the voltage up as transients hit), as would the time to recover and (lack of) overshoot and ringing.
Non-technical conceptualisation:
When a big transient hits, the PS voltage should fall fast enough to support sufficiently quick recovery, but should not fall far so as to maintain voltage for the transient. Recovery should be smooth and fast enough that voltage has recovered and the PS stabilised before the next big transient hits.
The caveat for me is, does the 15% stepped current in PSUD2 reflect anything like real-world conditions and can we really extrapolate audible effects from it?
Of course, this ignores PS impedance and maximum accepted ripple etc.
Regards,
91
Follow Ups:
"When a big transient hits, the PS voltage should fall fast enough to support sufficiently quick recovery, but should not fall far so as to maintain voltage for the transient. Recovery should be smooth and fast enough that voltage has recovered and the PS stabilised before the next big transient hits."In a class A circuit why would a big transient cause the current draw to increase longer than 1/4 of one wave length before the current draw starts down?
And 1/2 wave length later wouldn't the current draw be decreased from idle and the worry would be increased voltage?
1/4 wave length of the slowest frequency of interest (20Hz) is 12.5ms
If the supply is slow to react to current increases (and current decreases) and the voltage holds relatively steady for the first 12.5ms, until the current starts to decrease heading back to the idle current point, isn't that what we want?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 01/16/15
I think you have it nicely said on a conceptual basis. But I am not a EE Guru PSUD2 expert.
The 15% step was something EEs Swenson and Hasquin used. I just copied their examples Raymond.
Jeff
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