Arc Dynamic Stabilization in Low-Frequency Square-Wave Electronic Ballast for Metal Halide Lamps

Discharge lamps present a negative dynamic characteristic that makes necessary to use a current limiting element. In high-frequency resonant ballasts, current limitation is performed by the output resonant tank; but in low-frequency square-wave electronic ballasts, arc stabilization is accomplished...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2007-09, Vol.22 (5), p.1592-1599
Main Authors: Ribas, J., Alonso, J.M., Calleja, A.J., Lopez, E., Cardesin, J., Garcia, J., Rico, M.
Format: Article
Language:English
Subjects:
Applied sciences
Arc stabilization
Ballast
Connection and protection apparatus
Converters
Current limiters
Dynamic characteristics
Electrical engineering
Electrical engineering. Electrical power engineering
Electricity
Electronic ballasts
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Frequency
Ignition
Impedance
Inductors
Inverters
Lamps
metal halide (MH) lamps
Metal halide lamps
Miscellaneous
Pulse transformers
Resonance
Stabilization
Transformers and inductors
Various equipment and components
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Description
Summary:Discharge lamps present a negative dynamic characteristic that makes necessary to use a current limiting element. In high-frequency resonant ballasts, current limitation is performed by the output resonant tank; but in low-frequency square-wave electronic ballasts, arc stabilization is accomplished by the stage feeding the square wave inverter. Therefore, the design of the input converter must be made taking into account the lamp dynamic characteristic. In the present paper, a new procedure to obtain the small-signal dynamic characteristic of metal halide lamps is proposed. Using the proposed methodology, the small-signal characteristic of a 70-W lamp is obtained. This characteristic is then used for the design of an electronic ballast based on a buck-boost converter followed by a full bridge inverter. The limits for stable operation obtained are verified using a laboratory prototype.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2007.904162