What about the diodes and filter capacitors to make reasonable DC affecting efficency? Linear parts are big and have a lot of loss. Switching supplies make up for it, are smaller, cooler, have a better power factor and can self-protect during a fault. David
-----Original Message----- From: EV <[email protected]> On Behalf Of Mark Hanson via EV Sent: Friday, September 07, 2018 1:16 PM To: [email protected] Cc: Mark Hanson <[email protected]> Subject: [EVDL] Fwd: A comparative efficiency study of silicon-based solid state transformers - IEEE Conference Publication Hi folks. In summary a solid state transformer is less efficient, less reliable and more expensive than ye-ol passive 60 hertz transformer that are reliable as a rock. Not sure why GM would tout them for feeding fast chargers. They're in prototype stage now but can't compete on basic parameters. Passive 60 hertz transformers are 97% efficient. No-way 2 conversions in an AC to DC then DC to AC inverters are going to come close. They use a 10-20khz smaller isolation transformer internal to the step up or step down side conversion. Replacing one large component (60 Hertz transformer) with thousands of electronic components is less reliable. I've always had it beat into my pointy engineering head to minimize component count. Which is also why id never own a Tesla with 6800 or so cells in their battery. Have a renewable energy weekend Mark in Roanoke VA Sent from my iPhone Begin forwarded message: > From: "Hanson, Mark (GE Renewable Energy)" <[email protected]> > Date: September 7, 2018 at 1:07:28 PM EDT > To: "[email protected]" <[email protected]> > Subject: A comparative efficiency study of silicon-based solid state transformers - IEEE Conference Publication > > https://ieeexplore.ieee.org/document/5618255/ -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20180907/ce949827 /attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
