I am not saying I know better, but I seem to remember that while it is true that fets do have a resistive type operating region, (the "ohmic" region"), nonetheless when used as a switch in an inverter they do not operate in that region for any very significant amount of time but more like a true "switch" in that you can for instance double the current flow through them or more with no proportional increase in voltage drop across them, (note I did not say NO increase).
I believe that the increase in power loss is due at least as much to various inductor losses and capacitive losses than losses through the fets conduction channel. Admittedly it has been awhile since I looked into what causes fet based inverter efficiency losses so maybe I am wrong... As I seem to recall, Norms' model is a so called 'true sine wave' design which has rather more such inductive and capacitive losses than the modified wave types. And a well designed inverter CAN have much less loss as evidenced by modern high efficiency motor controllers, but often cost considerations result in less than optimum performance to the consumer. -Ken _______________________________________________ Liveaboard mailing list [email protected] To adjust your membership settings over the web http://www.liveaboardnow.org/mailman/listinfo/liveaboard To subscribe send an email to [email protected] To unsubscribe send an email to [email protected] The archives are at http://www.liveaboardnow.org/pipermail/liveaboard/ To search the archives http://www.mail-archive.com/[email protected] The Mailman Users Guide can be found here http://www.gnu.org/software/mailman/mailman-member/index.html
