What Martin said is correct. There is a lot of research in single stage
PFC but generally they are of lower power. Boost PFCs have better 
performance: lower THD and higher efficiency. 

One of the best Boost PFC control methods is one-cycle control
and I think IR has an IC IRIS51xx for the low power PFC with
one-cycle control (they call it single-cycle control). You can check
the following IR website.
http://www.irf.com/product-info/smps/scc.html
There is a Europe PCIM 2003 paper demonstrating 500w and 1kw
PFCs with discrete control (generic discrete components) which 
have very good THD. They also have results for 300W PFC with
the early IRIS51xx silicon versions.

The IR IC is not good for the 1kW PFC and seems not yet available. 
UCI power electronics lab has one 3-ph 5kw PFC/APF running with 
IR IGBTs. For 3-phase PFC/APF, no ICs are yet available for the 
one-cycle control method even though TI and IR have shown interests
in it. They also have done quite some stuffs with 1kW single
phase PFCs (with IR MOSFETs). They have quite good performance and
are not that big. The control board with standard linear and logic
ICs is actually very small. You may want to look at their
website.
http://www.eng.uci.edu/pel/pel.html
Please take note that the web site is not updated for some years
but the information is still relevant.

APF = Active power filter, normally only process harmonic
PFC = Power factor correction, process load as well

Xiaofan

>
>
>I don't understand what you're saying, he said he needed PFC, followed 
>by 60v out. I'll try to be more clear:
>
>~AC~ --> PFC -->(400v @ low amps) --> full bridge -> xfrmr --> 60v @ 
>many amps out
>
>I admit I'm not an expert, but I don't think you can make a single stage 
>PFC to take high voltage AC and output lower voltage DC at high powers.
>
>-- 
>Martin K
>http://wwia.org/sgroup/biofuel/
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