Title :
Analysis, Design, and Experimentation of a Closed-Loop Metal Halide Lamp Electronic Ballast
Author :
Costa, Marco A Dalla ; Kirsten, André Luís ; Alonso, J.M. ; García, Jorge ; Gacio, David
Author_Institution :
Fed. Univ. of Santa Maria, Santa Maria, Brazil
Abstract :
This paper presents the analysis, design, and experimentation of a closed-loop metal halide (MH) lamp ballast, which supplies the lamp with a low-frequency square waveform. First, a discussion related to the lamp parameter that should be regulated (power or current) is presented, since this issue has not been well addressed in the previous literature. Experiments demonstrated that lamp current can be chosen to be kept constant during lamp life, because it can attenuate the effect of lumen depreciation with lamp ageing, and, on the other hand, the lamp power does not reach overrated values during lamp life. Second, in order to analyze the open-loop characteristic and design a suitable controller for the closed-loop operation, a dynamic model of the lamp-ballast system is developed. Therefore, a phase-lag controller is proposed to minimize the steady-state error and provide a phase margin of about 80° (fully stable system). Experimental results using a flyback-based ballast supplying 35-W MH lamps with 100, 2500, and 5000 burning hours are presented to validate the theoretical analysis. It is demonstrated that the lamp current is kept constant at rated value (0.42 A) within the entire input voltage range. The time response of the complete closed-loop system is about 5 ms.
Keywords :
ageing; closed loop systems; control system synthesis; lamp accessories; metal vapour lamps; closed-loop MH lamp ballast; closed-loop metal halide lamp electronic ballast; closed-loop operation; flyback-based ballast; lamp ageing; lamp current; lamp life; lamp parameter; lamp power; low-frequency square waveform; lumen depreciation; open-loop characteristic; phase-lag controller; power 35 W; time 100 hour; time 2500 hour; time 5000 hour; Current control; Electronic ballasts; High intensity discharge lamps; Metals; Power harmonic filters; Transfer functions; Voltage measurement; Acoustic resonance (AR); closed-loop operation; electronic ballast; metal halide lamp; square waveform;
Journal_Title :
Industry Applications, IEEE Transactions on
DOI :
10.1109/TIA.2011.2175681