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In Reply to: RE: Increase L in pi network posted by Sidewinder on September 22, 2017 at 00:15:20
As this data sheet indicates, you could be pressing your luck with a 47 μF. part in the 1st position of the PSU filter.
IF the DCR of the 2 inductors is the same, a larger inductance yields less ripple, without changing the rail voltage.
If a "swinging" choke is on hand, I would not use it in a П section filter, as it's inductance varies with the current being passed. A "normal" choke intended for critical current duty will be fine. Inductors in choke I/P filters are subjected to much greater strain than those in cap. I/P filters and are constructed accordingly. If an inductor not specifically rated for choke I/P service is to be employed that way, substantial derating of its current handling capability is necessary.
Eli D.
Follow Ups:
Hi Eli,
Thanks for the information. To clarify, a choke designed for c I/P is also called a swinging choke?
Thanks,
David
Not all chokes used in choke I/P filters are "swinging". However, all chokes designed for critical current filter duty take the increased stresses of said service into account.
Eli D.
I can thank this forum for getting me hooked on L-critical choke input supplies. my amps are all heavier thanks to that.
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