New energy-saving transistor to eliminate the need for AC adapters in laptops

[David Farber <dave () farber net>]

Begin forwarded message:

From: dewayne () warpspeed com (Dewayne Hendricks)
Date: June 25, 2009 12:53:00 PM EDT
To: Dewayne-Net Technology List <xyzzy () warpspeed com>
Subject: [Dewayne-Net] New energy-saving transistor to eliminate the  
need for AC adapters in laptops

New energy-saving transistor to eliminate the need for AC adapters in  
laptops
<http://mdn.mainichi.jp/mdnnews/news/20090624p2a00m0na013000c.html>
Fujitsu Laboratories announced Tuesday that the company has developed  
a new energy-saving transistor.

The new transistor developed by the company, based in Kawasaki,  
Kanagawa Prefecture, can reduce electricity loss that occurs in the  
power supply units of computers and other devices to one-third or less  
of the current level. By downsizing the transistor, the power supply  
unit can be integrated into the body of laptop computers, eliminating  
the need for AC adapters. The company is aiming for practical  
application of the new transistor by 2011.

In computers, the power supply unit converts alternating current into  
direct current, during which about 30 percent of the electric power is  
lost as the transistor produces heat.

While traditional transistors are normally made from silicon,  
Fujitsu's key technology research team succeeded in developing a  
transistor using gallium nitride, a material commonly used in blue  
LEDs. With gallium nitride's resistance to high-voltage current being  
10 times as high as silicon's, transistors made from gallium nitride  
are more robust. At the same time, such transistors can reduce the  
electricity loss to below one-third of the level of silicon  
transistors, while a shorter inter-electrode distance enables a  
downsizing of the transistor.

[snip]
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