On Wed, 26 Nov 2003 14:28:34 GMT, L. M. Rappaport
wrote:


I think there are two kinds. One type uses a swinging core in the
transformer and works by adjusting the output voltage. The other uses
what is known as a "ferroresonant" transformer which works by
saturating the core at resonance with a non-polarized capacitor which
keeps the output steady regardless of input voltage swings. In a
marine environment, I'd opt for the latter as there are no moving
parts.

However, you can have problems when using a ferroresonant tranformer
or charger on a genset or other off-grid power sources, since the
ferroresonant transformer depends on the power frequency being very
close to 60 Hz. If the frequency shifts, the transformer output
voltage will also vary.





--
Peter Bennett, VE7CEI
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