Controlled leakage transformer for fluorescent lamp ballast incl

Details Controlled leakage transformer for fluorescent lamp ballast incl Controlled leakage transformer for fluorescent lamp ballast incl

1988-06-02

1990-02-20

Mis, David

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Transformer in the supply circuit

315278, 336182, H05B 4116, H01F 2728

Patent

active

049029428

ABSTRACT:
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.

REFERENCES:
patent: 3919595 (1975-11-01), Willis, Jr.
patent: 4672528 (1987-06-01), Park et al.
A. Dauhajre, "Modeling and Estimating of Leakage Phenomena in Magnetic Circuits", PhD. Thesis, California Inst. of Tech., 1986.
J. J. Spangler, "A Power Factor Correction MOSFET, Multiple Output, Flyback Switching Supply", Proc. of the 10th International PCI, Chicago, Ill. 1985, pp. 19-32.

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