Inductor devices – Core forms casing
Patent
1992-10-30
1994-10-04
Kozma, Thomas J.
Inductor devices
Core forms casing
296021, 336 96, 336200, 336212, 363125, H01F 2726, H01F 2730
Patent
active
053530012
ABSTRACT:
A planar transformer includes a multilayer printed circuit board having a plurality of spiral windings formed by metalization on various surfaces of the printed circuit board. A ferrite core assembly includes first and second core sections disposed on opposite sides of the printed circuit board and completely confining the conductors of the spiral windings. Each core section includes a thin, flat plate. The two flat plates are integral with or abut thin post sections that are thick enough to allow the printed circuit board to be accommodated between the first and second core sections. In one embodiment of the invention, the planar transformer is incorporated on the printed circuit board with other circuitry to form a low noise battery charger which is encapsulated in a male power connector.
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IBM Technical Disclosure Bulletin, "Low-Modulus Encapsulation System", by R. Braune, vol. II, No. 8, Jan. 1969, p. 904.
"Voltage Resonant Buck-Boost Converter Using Multi-Layer-Winding Transformer", Shoyama et al, 1989 IEEE, pp. 895-901.
Meinel Walter B.
Stitt, II R. Mark
Burr-Brown Corporation
Kozma Thomas J.
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