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In Reply to: RE: How to use dissimilar chokes? posted by DAK on May 13, 2015 at 12:59:41
DAK
With an LCLC filter use the 6H first
to get meet the critical inductance.
I would recommend downloading the PSUD program
or getting someone to do it for you.
Many factors are involved to get a
quiet and well regulated PS.
I could do it for you if you want.
I have alot of experience with this.
Post me off-line if this is your wish.
DanL
Follow Ups:
Hi DanL, I tried to down load the PSUD program once but my computer safety program (MacAfee) recommended against it. Anyway, thanks for tip.
What about the procedure using a smaller current inductor in the L2 position? cheers, Dak
Ignore MacAfee, the software is useful and safe.
Inductors intended for service at the I/P of LCLC filter must be hefty. They take quite a beating and are known to "sing". If you are going to use a choke that's not specifically rated for choke I/P service, you must derate its current handling capability. Derate by at least 50%.
The 2nd inductor is not subject to the stresses the 1st inductor endures. So, all you need is a part rated for the actual B+ draw.
When SS diodes are used to rectify the B+, protection against inductive kick back spikes is mandatory. A very high WVDC 0.01 μF. cap. in what would be the 1st position of a CLC filter provides the requisite protection. The cap. can help a little with "singing" too.
Eli D.
Thank you Eli, that is great information. I am starting to get a better understanding of how one should configure a CLCLC or LCLC power supply.
Is the .01uf cap a bypass cap or a in series cap. All of my previous CLCLC type filter have use 2.0uf or larger, up to 60uf , film caps. cheers, Dak
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