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Magnetically Controlled Electronic Ballasts With Isolated Output: The Variable Transformer Solution

Perdigão, M. ; Álvarez, J. ; Gacio, D. Gacio ; Saraiva, E. S.

IEEE Transactions on Industrial Electronics Vol. 58, Nº 9, pp. 4117 - 4129, September, 2011.

ISSN (print): 0278-0046
ISSN (online): 0278-0046

Scimago Journal Ranking: 1,95 (in 2011)

Digital Object Identifier: 10.1109/TIE.2011.2173895

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Abstract
In this paper, the variable transformer solution is presented as a step forward in magnetically controlled electronic ballasts. The proposed technique takes advantage of the device's equivalent series inductance to provide a new flexible way for lamp's luminous flux regulation. Output electrical isolation and constant frequency operation are also guaranteed by the proposed realization. A simple method for large-signal characterization of the variable transformer is described. An FH 14W/840 Osram lamp was chosen to validate this new technique and experimental results clearly show its adequate behavior.