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# Power Tip #4: Damping an Input Filter " Part 2 of 2

9/29/2008 02:00 PM EDT
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re: Power Tip #4: Damping an Input Filter " Part 2 of 2
2/11/2013 1:16:09 AM
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Robert, The figures for Power Tip #4 are missing. Don

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re: Power Tip #4: Damping an Input Filter " Part 2 of 2
8/6/2012 4:37:32 PM
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I'm getting "404 File Not Found" errors now when I try to view the Figures. Help! Where did they go?

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re: Power Tip #4: Damping an Input Filter " Part 2 of 2
10/2/2008 4:08:50 PM
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Interesting. I believe there are three basic topologies that dampen the input filter. This extra capacitor has the disadvantage that for instant connection of a high input voltage, the resistor needs to absorb 0.5CU^2. I experienced this as a problem. Another solution, used by computer products is a LC-series combination in parallel with LO. The math behind it is the same. The theme has been discussed since the eighties. I remember three articles. Only one of them uses the calculation of pole location to find an optimum. This should also work for two stage input filters. I could not see in the article presented here wether or not the NEGATIVE input impedance has been used in calculating the frequency spectrum. The second chart I find very interesting, but I wonder what kind of mathematical model has been used to derive it. Is this 50% approach a rule of a thumb thing or does it give the optimum ? Apart from the optimum value of R, there are also a minimum and a maximum value beyond which there are no stable solutions for C.

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