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In Reply to: RE: So, Neff, been trying to model micro chokes? posted by Chris O on March 25, 2012 at 14:03:46
No micro chokes for me unless I am working in the RF spectrum.
I have been analyizing the entire PS including the next section after the power tubes. I look for little nuances that can appear on the power tube side of the PS.
My power supplies as designed for a while are low DCR at least at the power transformer & tube rectifier. I use a hybrid bridge to keep the PIV lower. The foremntioned already makes a big difference. I also add .2uF input cap to a LCLC as a pre-suppressor before the LCLC.
I find my LCLC filter design has less recovery overshoot with higher than the as recommended at times 30 ohm maximum chokes. The last PS I modeled to the power tubes drops 8 volts for 16ms for a load change of 100 to 160ma, yet is a low ripple design.
4 volts better regulation (2.8% vs 1.4% regulation) & 4 ms faster time recovery (16ms vs 12ms) in a LESS design with high ripple is not a good tradeoff IMO.
Of course I can blowoff the whole discussion and build a shunt regulated PS, but I do not hear any difference.
When you are using a hybrid bridge is the final B+ close to the rated secondary voltage of the transformer you are using? I had read something to that effect. I was wondering how you had modeled it in PSUD, or if you had simply ran one model with a SS bridge, and one model with a tube rectifier, and averaged the two.
About .9x secondary voltage using LCLC with measurement at first cap.
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