To repeat myself: IGBT.
Google is your friend.
Compared to IGBT the other stuff is as dated as as vacuum tubes.
IGBT can switch 1000 Amps at 1000 VDC in microseconds -- with the device about the size of a cubic inch. 120 Hertz is eons to such a device.
Next, because of sampling speed and the quality of Poco sine waves, predicting the next commutations/ 0 volt cross-overs is a snap. Unlike most switches we deal with, the Poco can wait a couple of cycles to shut off the juice. That option opens the door to cheap switching.
This is the technology that permits wave synchronization for PV inverters.
Take it as Gospel: the Poco can switch your smart meter on and off remotely. The hacking of infrastructure that we read of in the news revolves around gaff-tastic zero-day vulnerabilities in this net.
Before the decade is out, all of these meters will have to be replaced. They're all wide open to even primitive hacks.
Last edited by Tesla; 03/27/13 07:51 AM.
