Stephen R Phillips wrote:
> I'm looking into designing a high power SMPS
> The design critera is a bit interesting.
> 1) Active Power factor correction <-- doable
> 2) 
>   a) 60V 10A peek
>   b) 2-48V 5A peek supplies
>   c) peek indicates this is the max current that is to be drawn but not
> neccesarily for more than 2 minutes.
> 3) it is not for telecom use 
> 4) wide supply range 120VAC - 240VAC
> 5) High efficiency, I prefer > 80% goal is actually 90% or better at
> this power level I personally do not like the idea of drawing > 11 Amps
> with this. (With most SMPS without Power factor correction that's 13A
> which is a bit high).
> 6) It needs to be able to be pluged into regular power outlet. IE
> 120VAC or 240VAC house-hold power outlet (because that's life you can't
> expect people to wire things specially for you).
> 
> What power factor correction IC's I've seem in use, are a boost
> convertor (say 400VDC).  I was looking at Fairchild's FAN4810 to use as
> a start for said project.  
> 
> Anyhow has anyone had success with > 500W supplies that won't go
> nuclear if loaded heavily on ocassion?
> 
> Stephen

You want 1100 watts -

My tip is to split it up. Run more than one PFC circuit. Use a full 
bridge to run it down to 60v [and isolate it]

Run another PFC/full bridge for the 48v requirement. I'd guess ~~83% 
efficiency at 70% loading without lots of time spent on details.

Wear safety glasses when testing :)

For an example of a 5kw PFC power supply have a look here:
<http://www.manzanitamicro.com/chargers3.htm>

-- 
Martin K
http://wwia.org/sgroup/biofuel/
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