----- Original Message -----
From: "Peter L. Peres" <plp@ACTCOM.CO.IL>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Saturday, February 15, 2003 5:46 PM
Subject: Re: [EE]: Inverter DC-AC


> 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

Good Idea.  I still need 115VAC to run my automation system and modifying
this is do-able but a pain.  I can get 115VAC from my source through a
transformer (PT) but how do I switch it.  My DC rail is 12VDC.  Are you
advising me to develop a DC-DC to up this rail closer to peak voltage?  I
think I put something together with a large toroidial transformer a long
time ago used in a DC-DC appl.  Should I amplify the AC with a DC offset,
such that 24VAC would be riding on 0VDC as the source?  Thank again.  I
should of mentioned earlier that this application is handy for power outages
as well.

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