Well that explains a lot.  I also googled and found some other docs on this. 
Relatively simple actually, and though I usually avoid transformers (cost, 
space, etc), I don't mind so much since this is a one-off (or few-off) 
application for my car, so I can wind some transformers for this.  Guess I'm 
off to do some reading...

Cheers,
-Neil.



On Sunday 24 September 2006 15:50, Xiaofan Chen wrote:
> Flyback converter is not really derived from boost converter. But you are
> right that flyback converters are more suitable for power level below
> 200Watts.
>
> Boost converters are very often used as the front end of PFC (power
> factor correction) circuits and they are okay even at power levels more
> than 1kW.
>
> But again I think you are right it might be better to use a transformer
> isolated full-bridge converter for this kind of application.
>
> Eg: TI UCC3895
> http://focus.ti.com/docs/prod/folders/print/ucc3895.html
>
> Regards,
> Xiaofan
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