Speaking of UPSs and inverters, what's the current technology on the DC to AC conversion? Are they using some high frequency PWM to simulate the 60 Hz allowing for smaller magnetics? I built an inverter about 40 years ago with a big 60 Hz transformer that was especially for that purpose (included feedback windings to drive the switching transistors). Seeing the low cost and small stuff available now, I wonder how work.

Thanks!

Harold




________________________________________________________________
Sign Up for Juno Platinum Internet Access Today
Only $9.95 per month!
Visit www.juno.com

--
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