The US researchers says that inverters based on their switches could operate with efficiencies as high as 99% – 2% better than the best silicon-based inverters. And their low heat dissipation means that the inverters could be air-cooled rather than needing bulky and costly liquid cooling. This could be a particular advantage in electric vehicle applications.
The switch, called the FREEDM Super-Cascode, combines 12 small (1.2kV), off-the-shelf SiC power devices in series to reach a power rating of 15kV and 40A. It needs only one gate signal to turn it on and off, making it simple to implement and less complicated than IGBT systems based on series connections. The new switch is also able to operate over a wide range of temperatures and frequencies due to its effective heat dissipation.
“As millions know on the internet and around the world what happens when a bowling ball doesn’t come off your thumb during live TV, the thumb for one handed bowlers is essential for a perfect release. After that prolific day in Las Vegas, where the pitch in my thumb hole was wrong, I started using the Switch Grip the week after and haven’t looked back. When drilling hundreds of balls a year on the PBA Tour and while at home, it was hard to get the perfect thumb on every ball. Now I have the perfect thumb in every ball and can eliminate another variable in my game.
As a Pro Shop owner, I try and get all of my customers who have an odd shaped thumb to try the Switch Grip product. This elevates any issue with the customer having a less than perfect thumb in every ball. This product is perfect for customers who buy more than 4 balls a year because they have full faith in knowing the next ball will feel the exact same as their pervious ones. With a game that has an infinite about of variables to deal with, this product helps eliminate one of those variables so you can score higher and have more fun!”
The new SiC power switch – being developed by researchers at the – could cost about half as much as existing high-voltage SiC devices. The new device retains the high efficiency and high switching speeds of SiC devices, without suffering the energy losses of Si devices when they are switched on or off.
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