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AssigneeGeneral Electric Company
InventorSayed-Amr El-Hamamsy
Estimating the term…
All the magnetic functions required in a ballast for a fluorescent lamp are integrated in a single, standard magnetic core which provides isolation, voltage step-up, ballasting, power factor correction and cathode heat for multiple lamps operating multiple lamps in an isolated-series configuration. In a three-legged transformer core embodiment, the primary winding is continuously wound on all three legs, while secondary windings are included on two of the legs. Ballasting inductance is provided by winding the primary on the third leg. The number of primary turns N.sub.p necessary to avoid saturation of the transformer for any specific input voltage and core material, the number of primary windings N.sub.p1 on the secondary legs and the number of primary windings N.sub.p2 on the third leg are determined according to the equation 2N.sub.p1 =N.sub.p -N.sub.p2.
An isolation transformer for use in a multi-lamp ballast comprising:
An isolation transformer for use in a multi-lamp ballast comprising:
A method of manufacturing an isolation transformer for use in a multi-lamp ballast including a multi-legged transformer core, a primary winding and a secondary winding, comprising the steps of:
A method of manufacturing an isolation transformer for use in a multi-lamp ballast including a two-legged transformer core, a primary winding and a secondary winding, comprising the steps of:
Dependencies are inferred from the claim text.