 
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
|
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
Any rules regarding safety margins in power supply caps?
Say power supplys actual steady state voltage reading is 33.7 vdc. Is 50vdc cap ok or does safe design practice specify 63 or 80 vdc?Thanks
Follow Ups:
Hey-hey!!!,
The short story is that the 20% voltage headroom is fine. Long form is that if 'lytics don't get exposed to something like half the rated voltage for a long time, like constant service at half rated voltage, the insulating layer gets thinner. this yeilds two effects, one is a lowering of the actual voltage rating until, and if, they can be reformed. The other is an increase in capacitance, since the dielectric insulating layer is thinner the capacitance is higher.
regards,
Douglas
Caps are rated for "nominal" voltage. For the cap, nominal voltage is voltage that cap can sustain for 10,000 hours continiously with less or equal of 10% of failure. So when you see 50V on cap, this is how they got this voltage.There is another voltage rating called maximum voltage (or breakdown voltage). This is the voltage at wich cap will go short, and they get it by increasing voltage from nominal voltage in steps of 10% untill 10% of caps go short.
Military standards are different, (there is at least 100 of them), as well as some other special standards. In all special standards there will be special part number on cap or other marks. There is so many of these, and I never have seen any catalogue that explains what standard is what.
As for your question... designers "like" to alow about 20% extra voltage than it is actual.
20% is a good margin.
Insure at least 20% voltage margin as a good rule of thumb.
G.
Crank it up...
This post is made possible by the generous support of people like you and our sponsors:
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
