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Old 3rd August 2004, 08:31 PM   #1
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Default different psu filter topologies ?


Are there any topology other than basic RC, LC or RLC circuits to use as psu ripple filter ? I didnt even see any commercial one using T or pi networks.


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Old 4th August 2004, 12:10 AM   #2
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No idea what's meant by a T-network but a Pi type filter is just a series of RC filter networks.

Other than that it depends on what element ( R, C or L) that you put as a first element that determines the name of the type of filter you're using as it's that what makes the difference in the nature of the load the rectifer is seeing.

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Old 4th August 2004, 07:22 AM   #3
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Hi fdegrove,

Radiatron Designers Handbook have a few examples of T and pi networks at Chapter 31/Section 3.

Do you mean the only way for filtering is to use RC, LC networks ?


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Old 4th August 2004, 07:38 AM   #4
dhaen is offline dhaen  Europe
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Default Resonant circuits

Hi MB,

Conrad Johnson used a parallel-T , in pi form, on their MV55 amplifier.
This consisted of a C-L-C network with another C in parallel with the L.
What is interesting is that the inductor can be very small when used in this way.
Sorry I can't post the whole schematic because it's copyright, but I hope this is section is OK.
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Old 4th August 2004, 07:53 AM   #5
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Default ...the psu otherwise known as...

Thorsten has been championing the 'resonant choke' psu for a while. The best account I found on the web was this one psu filters . It seems to work very well in reducing the 100Hz element of ripple - should be tuned for 120Hz in US. I have only found it in r.f. kit before. Neat that C-J. have used it.


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