Switching battery charger for reducing electromagnetic emussions

Details Switching battery charger for reducing electromagnetic emussions Switching battery charger for reducing electromagnetic emussions

1994-03-04

1996-05-07

Thomas, Laura

Inductor devices

With mounting or supporting means

336200, 174 35R, 174262, 361816, 361800, 361784, 361760, 439 65, 29838, H01F 1502, H05K 118

Patent

active

055150217

ABSTRACT:
A method and apparatus for reducing electromagnetic emissions from switching-type battery chargers safely and at low cost. The method and apparatus generally comprises enclosing the battery charger in a conductive metal case, electrically and physically isolating the low voltage, high current output components from the remainder of the circuitry, reducing the loop area of the output circuit, use of ferrite beads on various conductors, use of an output common-mode inductor wound within a ferrite core, use of inductors and transformers having foil windings, and use of a fusible resistor to protect internal circuitry. The battery charger includes a secondary assembly printed circuit board and a primary assembly printed circuit board which are supported in a spaced apart, substantially parallel arrangement.

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