At 01:16 AM 27/10/2002 +1300, you wrote:
>Somewhat over a year ago I proposed a design challenge for a simple circuit
>to step up low voltages to somewhat higher ones for a range of applications.
>I believe there was and is a demand for such capability and that such a
>circuit may even provide functionality not readily achieved with available
>ICs. While there was some initial response to this challenge it died an
>early death, probably due to the events of September 11th.

I have no intention of getting into the logistics of the control system at
this point, but for a converting topology, I suggest the Cuk configuration.

Information could be found at www.boostbuck.com until recently (they are
now revamping their website) so google's cache is effective.
http://www.google.ca/search?q=cache:-RkKDi3znT8C:www.boostbuck.com/+&hl=en&ie=UTF-8

This topology uses a capacitor as the primary transfer element, and thereby
becomes more efficient than conventional topologies.
One possible disadvantage is that it is an inverting topology.  However,
there appears to be an isolated version.

This design is worth, at least, a small consideration.

--Brendan

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics