Magnetek Universal Mfg., Corp.

Magnetek Universal Mfg. Co.

Frederick P Bauer

Robert A Kulka

Raymond H Van Wagener

Leonard J Kurgan

A filament switch for a rapid start fluorescent lamp disconnects or reduces through phase modulation the heating current to a plurality of lamp filaments to save power. The switch uses a trigger in series with a voltage sensitive element and an impedance element, the switch being responsive to the difference between a lamp starting voltage and a lamp sustaining voltage for determining when and for how long the filaments are heated.

Filment switch for a lamp ballast

A fluorescent ballast assembly has a primary coil wound on a primary coil bobbin and a lag coil wound on a lag coil bobbin, each coil having wire starts, taps and finishes. A strip circuit board including a plurality of pin receiving holes and a plurality of wire insertion holes corresponding to the wire starts, tabs and finishes, is attached substantially perpendicular to and in contact with the bobbins. The strip circuit board has an insulating support with conductive strips attached thereto, preferably manufactured using automated equipment. Substituting a mechanically constructed and assembled strip circuit board for a printed circuit board eliminates the need for chemical plating or etching operations, reducing costs and easing assembly.

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Mendenhall, MS, United States of America

Frederick P Bauer