A Single-Stage High-Power-Factor Electronic Ballast Based on Integrated Buck Flyback Converter to Supply Metal Halide Lamps
Dalla Costa, M.A.
Alonso, J.M.
Miranda, J.C.
Garcia, J.
Lamar, D.G.
Univ. of Oviedo, Gijon;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: March 2008
Volume: 55,
Issue: 3
On page(s): 1112-1122
ISSN: 0278-0046
INSPEC Accession Number: 9897230
Digital Object Identifier: 10.1109/TIE.2007.909729
Current Version Published: 2008-03-03
Abstract
In this paper, a novel single-stage electronic ballast with a high power factor is presented. The ballast circuit is based on the integration of a buck converter to provide the power factor correction, and a flyback converter to control the lamp power and to supply the lamp with a low-frequency square-waveform current. Both converters work in discontinuous conduction mode, which simplifies the control. In spite of being an integrated topology, the circuit does not present additional stress of voltage or current in the main switch, which handles only the flyback or buck current, depending on the operation mode. To supply the lamp with a low-frequency square-wave current to avoid acoustic resonances, the flyback has two secondary windings that operate complementarily at a low frequency. The design procedure of the converters is also detailed. Experimental results from a 35-W metal halide lamp are presented, where the proposed ballast reached a power factor of 0.95, a total harmonic distortion of 30% (complying with IEC 61000-3-2), and an efficiency of 90%.
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