Optimization of universal ballasts through magnetic regulators

Author

Perdigão, M.S. ; Alonso, J.M. ; Dalla Costa, M.A. ; Saraiva, E.S.

Author_Institution

Inst. de Telecomun., Coimbra

fYear

2008

fDate

24-28 Feb. 2008

Firstpage

1214

Lastpage

1220

Abstract

Nowadays there are few commercial types of ballasts able to control fluorescent lamps with different power ratings. One of the main issues is how to get optimum operation for each lamp in this condition. This paper tries to demonstrate how to accomplish this objective using a magnetic regulator, i.e. using a variable inductor. This variable inductor is controlled by a dc current delivered by a forward converter directly supplied from the ballast dc bus voltage. This control current allows changing the resonant tank, adapting it to the working parameters imposed by each lamp, ensuring near resonance working conditions. Design criteria and practical verifications are included to confirm this new technique. Theoretical predictions are verified with the experimental results for three TLD Philips fluorescent lamps, from 18 W to 58 W.

Keywords

electric current control; fluorescent lamps; lamp accessories; lighting control; power convertors; TLD Philips; dc bus voltage; fluorescent lamps control; magnetic regulators; power 18 W to 58 W; resonant tank; universal ballasts; variable inductor; Circuit topology; Costs; Electronic ballasts; Fluorescent lamps; Inverters; Magnetic resonance; Magnetic variables control; Regulators; Switching frequency; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition, 2008. APEC 2008. Twenty-Third Annual IEEE

Conference_Location

Austin, TX

ISSN

1048-2334

Print_ISBN

978-1-4244-1873-2

Electronic_ISBN

1048-2334

Type

conf

DOI

10.1109/APEC.2008.4522877

Filename

4522877