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89888Power supply caps

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  • Andrey Lipavsky
    Apr 2, 2008
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      I'm building a power supply and have a question on cap size.

      My toroidal transformer will supply 40V at 24A. Now, according to the
      standard cap formula, I would need roughly 30K-uf to sustain the 55VDC at
      20A (derated to 80%).

      My question is why none of the over-the-counter power supplies in this VA
      bracket seem to use so much capacitance? Is this really overkill or are
      they just cutting corners?

      Andrey Lipavsky
      Essex Jewelers
      490 E. McMillan St.
      Studio 205
      Cincinnati, OH 45206
      (513) 826-0240
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