> -----Original Message-----
> From: piclist-bounces@mit.edu 
> [mailto:piclist-bounces@mit.edu] On Behalf Of Bob S.
> Sent: Monday, January 10, 2005 6:18 PM
> To: piclist@mit.edu; pic microcontroller discussion list
> Subject: Re: [EE] Single Phase AC control via PWM (maybe a challenge?)
> 
> 
> Thanks for your input, but....
> 
> What you describe as an "active PFC", sounds suspiciously 
> like an SMPS.
>   Been there, tried that, it doesn't work very good for high amperage 
> (low voltage)variable output power supplies (unless your box is 
> basically a big aluminum heatsink).
> 
> I had a SMPS prototype made, and while it did work, it 
> required a lot of
> heatsinking for the output diodes, and even some heatsinks for the
> switching mosfets.  It wasn't much more compact, (wasn't 
> linear either), 
> and by the time you got done with all the extra caps, heatsinks, and 
> what not, it weighed about the same as the 60hz transformer 
> we're using. 
>   Basically, I didn't see anything remotely "efficient" about it.
> 
> I'm also wanting to go with a plastic enclosure, as the interface
> control I'm wanting to use requires it (no metal allowed).




If I had to do this I'd hack a dimmable electronic l2v halogen lighting
transformer
Give me $3,000 I'll supply you 10  :-)

  PC



> I had asked around to a few other people/firms, and the best response
I 
> got was that it would cost me $10,000 just for the design & prototype.
A 
> bit too pricey for my wallet (especially if it didn't work as
advertised).

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