Shunt holding means for ballasts

Details Shunt holding means for ballasts Shunt holding means for ballasts

1989-03-31

1990-08-28

Kozma, Thomas J.

Inductor devices

Inductive regulators with no relatively moving parts

With magnetic shunt to increase leakage reactance

336165, 336198, 336210, H01F 2108, H01F 2726

Patent

active

049528998

ABSTRACT:
A ballast assembly for a fluorescent lighting fixture includes a magnetic core, a primary winding and a secondary winding, both windings mounted on a central leg of the core, with a shunt disposed between the windings to prevent a flux generated by the primary winding from coupling with a flux generated by the secondary winding. The ballast further includes means for securing the shunt comprising a wall placed between the windings, with the wall having one or more structures formed integrally on the wall for engaging the shunt. The wall may comprise a flange of a bobbin, or be free standing. Using formed structures eliminates the need for winding tape around the shunts to provide an air gap between the sunt and the core. This assures long-term stability and reduces the potential for nuisance humming.

REFERENCES:
patent: 2180759 (1939-11-01), Kneisley
patent: 2850708 (1958-09-01), Antalis
patent: 3010050 (1961-11-01), Hume et al.
patent: 4400675 (1983-08-01), Thomas
patent: 4730178 (1988-03-01), Gunnels et al.
patent: 4800357 (1989-01-01), Nickels, Jr. et al.

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