Taipei, Taiwan: February 25, 2004 – System General has just been awarded a patent for a primary-side PWM controller circuit design, further demonstrating its commitment to innovation in the power management industry. The patent relates to a technique for controlling the output current and output voltage of a power supply through primary-side feedback control. This offers several advantages, including reduced size and higher efficiency.

The patented primary-side PWM controller circuit design indirectly senses the output voltage of the power supply through the supply voltage. This allows the costly secondary-side optical-coupler commonly used in power supplies to be eliminated, substantially reducing the size and manufacturing cost of the power supply. Furthermore, the PWM controller technology covered by this patent allows for current-sense detection, increasing the efficiency of the power supply.

Tom Yang, System General’s CEO stated, “The approval of this patent strengthens our intellectual property portfolio. This helps System General differentiate itself from the competition, while providing customers with the most advanced Power IC products available. We look forward to announcing the release of a full line of future products based on this technology.”

This patent solidifies System General’s core technology backbone. The patented primary-side PWM controller technology will be incorporated into many diverse product lines in the future. The patent has been approved and is currently being assigned a patent number by the U.S. Patent and Trademark Office. (U.S. Patent No: 6,674,656)

Applications
The new PWM controller technology is ideal for regulating switching mode power supplies in electronic appliances, computers, cell phones, and many other end products. System General’s team of R&D engineers is actively developing the next generation of power IC products based on this technology.