Felipe Sarasola

US Patent:

49104527, Mar 20, 1990

Filed:

May 16, 1989

Appl. No.:

7/352797

Inventors:

Frederick T. Dickens - Randolph NJ
Felipe Sarasola - Parsippany NJ
Norman G. Ziesse - Chester NJ

Assignee:

American Telephone and Telegraph Company, AT&T Bell Laboratories - Murray Hill NJ

International Classification:

H01F 2742

US Classification:

323355

Abstract:

Efficient high frequency operation of magnetic devices is achieved by utilizing ferrites that have a low power dissipation hysteresis characteristic and by designing these magnetic devices to operate within an operational range where all applied magnetic forces to the magnetic core have a substantially linear constant permeability response. Within this operational range the hysteresis loop of the selected ferrite material approximates an ellipse with very little area encompassed between the increasing and decreasing B-H locus of the hysteresis loop. The cyclic energy dissipation is significantly reduced as compared to conventional magnetic operations and high frequency operation can be achieved with very high efficiencies.