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A Novel Constant-Power Control for Metal-Halide Lamp Electronic Ballasts with Dimming Capability

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5 Author(s)
Yao-Te Huang ; Department of Electrical Engineering, National Taiwan University of Science and Technology , Taipei, Taiwan ; Horng-Ching Hsiao ; Yi-Hua Liu ; Ching-Ran Lee
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In this paper, a new dimmable electronic ballast for metal-halide (MH) lamps based on a three-stage structure is proposed. The presented dimmable electronic ballast can dim smoothly without acoustic resonance from 50% to 100% brightness. A novel current-control method with constant-power capability is also presented to solve the power-drifting problem resulting from the V- I characteristic variations between lamps or caused by the aging of lamp. The dimming capability allows the ballast to adjust its working condition according to the environments or the dimming command; this further improves the energy efficiency. Finally, a 150-W MH lamp ballast prototype is built to verify the feasibility of the proposed methods.

Published in:

IEEE Transactions on Plasma Science  (Volume:38 ,  Issue: 6 )