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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: Low DCR versus higher inductance chokes posted by xaudiomanx@aol.com on October 5, 2008 at 20:35:14:
For a 60hz input, critical inductance is Lc > RL/1130 (From RDH4), where RL is the load resistance. You can usually approximate it by RL = VL/IL where VL = 0.9*(VAC-Vdrop), IL is load current, where VAC is the AC input voltage to the filter (per leg) and Vdrop is the diode drop voltage (you can approximate here). You can do all the math here, or a few button clicks in PSUDII :).
Whatever value you find, it's best to use 25%+ minimum inductance to ensure it won't drop into DCM and deregulate (B+ will increase). Just make sure your inductor resistance isn't too high that winding dissipation will risk an open-coil. Usually < 5 watts on an average sized choke is the maximum you'd want (hard to say what 'average' is, but I'm looking at a 2.5" x 3" x 1" lamination stack choke here that has 75 ohms and is rated for 300mA -> 6.75 watts @ max DC current). Having some resistance helps with damping and ringing with a changing load. Hope this helps!
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- RE: Low DCR versus higher inductance chokes - boris_the_blade 21:07:47 10/05/08 (0)
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