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Old 10th January 2013, 09:19 AM   #991
RCruz is offline RCruz  Switzerland
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So if we use the prereg, we can be sure to minimize or null any oscilation possibility right ?
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Old 10th January 2013, 09:27 AM   #992
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So if we use the prereg, we can be sure to minimize or null any oscilation possibility right ?

Only at your own risk. It is far from clear that the oscillation is initiated by incoming noise.
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Old 10th January 2013, 09:29 AM   #993
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After a a few experiments all oscillation is dead applying the compensation shown in post #983 with both comp caps at 2200p.

The compensation scheme shown in post #985 did not work for me.

Good work guys
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Old 10th January 2013, 09:31 AM   #994
PMA is offline PMA  Europe
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That is where the pre-regulator works, it will stop anything in that range (1M and above) before it enters the CVS/CCS/Servo
A small correction, 1M and below
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Old 10th January 2013, 09:33 AM   #995
PMA is offline PMA  Europe
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Originally Posted by analog_sa View Post
It is far from clear that the oscillation is initiated by incoming noise.
You are correct. The original (uncompensated) circuit is NOT stable or is only conditionally stable. This we can see from Bode plots. Yes, after compensation of local feedback loops it gets stable.
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Old 10th January 2013, 09:37 AM   #996
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by RCruz View Post
So if we use the prereg, we can be sure to minimize or null any oscilation possibility right ?
No, that is not what I said Using the prereg removes one possible source of 'agitation' that may start oscillations. The most common source of 'agitation' is the internal noise of the (any) circuit and that cannot be removed.

But, if your PSU is not oscillating (as most) then there is no need to compensate.

BTW this (self-agitation by internal noise) is a good argument to use high quality, low noise, components in every/any circuit. Some times (but not all times) you can spot problems by running the simulation in high resolution (10nS or smaller step size) with no AC signal sources attached. If you look at the FFT of this analysis you may be able to spot potential problems.
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Old 10th January 2013, 09:39 AM   #997
FdW is offline FdW  Netherlands
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Originally Posted by analog_sa View Post
After a a few experiments all oscillation is dead applying the compensation shown in post #983 with both comp caps at 2200p.

The compensation scheme shown in post #985 did not work for me.

Good work guys
That is cool
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Old 10th January 2013, 09:40 AM   #998
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In case anyone remembers my old complains that the Paradise will burst into oscillation when shorting the input, or at least something resembling oscillation - this is now completely gone. Apparently shorting the input was feeding ground noise, i.e. the now missing 7MHz into the inputs.
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Old 10th January 2013, 09:58 AM   #999
Take5 is offline Take5  Germany
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And floating DC at the output is also gone?

Chris
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Old 10th January 2013, 10:18 AM   #1000
FdW is offline FdW  Netherlands
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Originally Posted by PMA View Post
A small correction, 1M and below
I think that the CLC-circuit should be able to stop a bit more (above 1M), but that will depend on the quality (and type) of L being used. There is good cause here to include some ferrite beads in the prereg to stop even higher frequencies (Holger? ).
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