On Sat, 15 Feb 2003, Ray Gallant wrote:

*>Thanks for the feedback, but  I insist on building it since it's an addition
*>to my present Home HVAC System that I built from scratch (all pic driven)
*>for which I am proud of.  I could have bought one of these also.  {slewrate}

The 'easy' way to make a sine converter is to use a class B push-pull
amplifier and a split secondary transformer (2x10V for 12V batteries). All
the other ways involve a DC/DC converter steered with |sin| waveform and
an active H bridge in the high voltage side.  This will give about 70%
efficiency, which is low. Maybe it would be easier to convert the 115Vac
installation to 24Vdc or 48Vdc and save one major part (or pita). What
would it take to convert the blower to a static switched dc motor ? These
are made to specs like you need for servo purposes.

Peter

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