Taipei, Taiwan - June 5, 2003 – SG (System General Corporation) announced today that it has acquired an important patent for a power-saving PWM controller design. The PWM controller modulates the off-time of the controller under light-load and zero-load conditions, to extend the switching period of the power supply whenever possible. This can substantially reduce power consumption under light-load and zero-load conditions. This innovative feature is included in System General’s latest Green Power IC series. In addition to conserving power, the patented PWM controller design can also improve system stability.

This patent is currently registered with the United States Patent Office (Patent Number US 6,545,882).

In addition to this patent, SG has already acquired more than twenty patents worldwide. A dozen new patent applications are currently pending. SG expects to apply for more than fifty new patents in the near future.

“In my opinion, patent protection is becoming more and more important to winning the battle, especially for an IC design company like ours. We have great innovations and they will offer great benefits to our customers. We are very pleased that our inventions have been recognized and protected," said Tom Yang, President and CEO of SG. "We are continually developing new inventions and winning patents for them."

Off-Time Modulation
This newly patented PWM controller saves power by increasing the switching period under light-load and zero-load conditions. Under heavy-load conditions, the controller maintains a constant maximum output current. These two functions prevent the magnetic components (inductors, transformers, etc) from being saturated.