CAMARILLO, Calif.--(BUSINESS WIRE)--Power-One, Inc. (NASDAQ:PWER - News) today announced that the U.S. District Court for the Eastern District of Texas, Marshall Division, has completed the Markman hearing and yesterday issued its claim construction ruling on March 22. The ruling decides a number of important issues in favor of Power-One and strengthens Power-One's patent infringement claims as it proceeds to a jury trial.

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The Court's ruling rejects a defense raised by Artesyn Technologies (a wholly owned subsidiary of Emerson Electric Co.) that Power-One's patents are invalid as being indefinite. The Court denied Artesyn's defense by finding that the claim term point-of-load ("POL") regulator, which is an integral part of all the patent claims, has a legally definite meaning. The Court ruled that POLs are a "known device in the art," and that "This evidence plainly suggests that POLs were well known devices whose locations and functions relative to other components was understood by those of ordinary skill in the art." For the hotly contested claim term POL, the Court wholly adopted Power-One's claim construction, finding that Power-One was legally correct. The Court also established the meaning of numerous other contested terms in the patent claims. A significant majority were construed in favor of the definitions proposed by Power-One.

Bill Yeates, CEO, commented, "The Court's ruling is a big positive for our litigation and validates our belief in the broad meaning and scope of our patent claims. We have asserted in the litigation that Artesyn infringes 82 claims in 4 patents. This ruling provides very substantial support for our assertion that Artesyn is infringing Power-One's patents with its PMBus compliant DPL20C point of load converter. We fully expect the jury to find that Artesyn is infringing our patents when the trial is held in August".

Mr. Yeates continued, "As this lawsuit indicates and as we have been communicating to our investors for some time now, our Z-One® technology is the most innovative, advanced, and feature-rich technology for this power marketplace. Since we started our work in this ground-breaking technology, Power-One has been leading digital power IP development to combine power management and power conversion in a system. Due to major developments in the past few years, we now have many products which effectively address the needs of customers within this market."

The four Power-One patents in the lawsuit generally concern digital power management and control of POLs on the circuit board. Power-One has incorporated this technology into its Z-One products and system architecture, which allows for the central control of distributed point of load power regulators. In addition to the issued patents in this lawsuit, Power-One has a growing family of system and element-specific patents and patent applications covering its Z-One products and architecture.

Power-One is seeking an injunction to stop Artesyn from selling infringing products, along with other remedies. Trial is scheduled for August, 2007.

About Power-One

Power-One is a leading designer and manufacturer of power conversion products sold primarily to OEM customers in the telecommunications and server/storage markets; as well as data communications equipment manufacturers. Power-One's high-reliability products are also used in applications such as test equipment, high-end industrial applications, and alternative energy. Power-One, with headquarters in Camarillo, CA, has over 4,000 employees with manufacturing and/or R&D operations in the United States, Dominican Republic, Italy, Hungary, Switzerland, Slovakia, Ireland and China. For more information on Power-One, please visit the website at www.power-one.com.

Power-One, Inc.
Dave Hage, Executive Vice President, 805-987-8741
or
Avalon Investor Relations
Kristyn Hutzell, 512-514-6046