http://www.maxhttp://rapidshare.com/files/11945029/Michener__James.rar im-ic.com/appnotes.cfm/an_pk/4266
A discussion of switch mode devices and where the losses are. Indicates that most (for the designs covered in this note) are in conduction losses of mosfets. books.google.com/books?id=NErRJEn3hRUC&pg=PA136&lpg=PA136&dq=%22inverter%22%2B%22conduction+losses%22&source=bl&ots=HfAiRzy6M0&sig=DDyImHBC_7Qr5gcCUxuwuzoulfk&hl=en&ei=RiTTSertKqrulQffmZz7Cw&sa=X&oi=book_result&resnum=6&ct=result Here in the above link we see that mosfets are not used much in higher input voltage switch mode devices so their conduction losses at elevated operating temps will be much less, and also that mosfets used in low input voltage devices can have as low an on state conduction resistance as you want if the device is big enough (and more expensive therefore). So I would say my earlier summarize that fet losses in inverters accounts for most of their inefficiencies was not entirely accurate, but such losses can be minimized by either not using fets at all (although the device that would be more efficient here and might replace them, the IGBT, is a sort of combination of a fet and a bipolar transistor) or to use big and expensive fets. In any case, a well designed inverter can be in the mid 90's% efficiency at its best run point, and around or maybe a bit less than 90% overall for nearly all use. Which means that a properly sized inverter can save a significant amount of power. Tired of having to send your inverter in when it fails? BUILD YOUR OWN! Plans here; http://www.qsl.net/dg5sga/inverter.htm -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
