Runo's Power Design

One of my most important tools is Mathcad - a mathematics software, in which I have developed a variety of tailor made and specialized worksheets intended for typical SMPS design.
Here is a small selection - some of them with examples of results shown in PDF format:

  • Flyback, "discontinuous" as well as "continuous current mode" and "boundary conduction mode".

  • Booster for "power factor correction" with fixed frequency.

  • Booster for "power factor correction" with variable frequency - "boundary conduction mode" Boundary Conduction Mode.

  • Booster as a DC - DC converter.

  • Forward converter (buck with transformer).

  • Full bridge, half bridge and push-pull converter.

  • Half bridge and full bridge resonance converters of the LLC or the LCC type. Also see my guide to the LLC analysis worksheet here.

  • Inductor design, airgap, saturation etc.

  • Feedback loop with open loop and closed loop phase- and gain curves and step load response. A simple and a little more advanced example.
    See also this article. Or this: Buck Converter Loop.

  • Spectrum of conducted emission and calculation of the necessary noise filter.

Still today, new worksheets are occasionally added to my assortment. By virtue of these tools I am often able to hit very close to the target in the first shot.
I find the "Try something - see if it gets better"-method very insufficient if it is used alone.

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Phone +45 6476 1002
runo.nielsen@tdcadsl.dk