Miniature Magnetics for Transformers

Most electronic systems, from telecommunications networks and computers to Internet appliances, incorporate power supplies containing magnetic transformers. Typically, the size and weight of these components dictate the size limitations on designers of electronic equipment. A patent filed earlier this year by MagneTek, Nashville, TN, proposes an alternate coil technology that could cut the size of systems, or increase their power handling capacity by 30% or more.

Magnetek engineers accomplished the design without resorting to special and exotic materials. Instead, the R&D staff found a different way to wrap the windings around a core that provided the device with better thermal management and improved conductivity. The packaging also increased heat sinking, further reducing loss through heat. Initial transformers based on the patent are about one-fifth in size and lighter in weight than conventional devices of equal power-handling capacity.

"We expect this new technology to substantially reduce the size and weight or, conversely, increase the power ratings of our power supplies, compared to those based on the best previous technology," says Dr. Alexander Levran, chief technology officer for the company. "Power supplies using our miniature magnetics could, in turn, enable higher power-density data-storage and networking systems and, ultimately, more compact, lighter weight electronic products of all kinds." He added that MagneTek is already designing the devices into selected custom and standard power conversion products.

The miniature magnetic components are suitable to a wide frequency range of 20 kHz to 1 MHz. Their small size will be ideal for automated surface-mount processes, as well as through-hole manufacturing.

--RM

For more information: Circle 555 -MagneTek, Inc., or connect directly to their website via the Online Reader Service Program at http://www.OneRS.net/103df-555