[time-nuts] Parallel voltage regulators

Bruce Griffiths bruce.griffiths at xtra.co.nz
Fri Oct 26 18:06:35 EDT 2007

Pete wrote:
> Switchmode regulators really are risky for use in a low
> noise environment. Even if you can reduce input and
> output conducted noise to acceptable levels, the 
> opportunity for magnetic coupling from the inductor
> to adjacent wiring is bad news. This can be very 
> tough to find and eliminate, particularly if the 
> controller frequency varies with load. Toroidal
> inductors are superior, but lead dress/routing can
> still result in unwanted coupling.
> Pete
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Using a series resonant topology for the switching power supply can be
helpful in reducing EMI.
However even then one has to be careful to use the correct form of
resonant converter to achieve low noise.
Whilst such regulators can easily be designed they are not commonly
available off the shelf.
The design and construction of such a regulator isnt a task for a beginner.


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