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Re: How good are MMC caps ;-))



Original poster: "Antonio Carlos M. de Queiroz" <acmdq@xxxxxxxxxx>

Tesla list wrote:

Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>
Bleeding and balancing are two unrelated things.
The mechanism by which unequal charges remain on individual MMC caps is
not understood.  It is not due to unequal capacitance values.  In my
experiments, some capacitor types are prone to developing these charges,
and others are not, using exactly the same cap values and test circuit.
I have no idea what causes this difference.

Probably corona at the interconnections, effectively adding rectifiers across the capacitors at random positions (or systematically, depending on how asymmetrical the construction of the connections around each capacitor is).

Antonio Carlos M. de Queiroz