Title :
White-noise modulation of high-frequency high-intensity discharge lamp ballasts
Author :
Laskai, Laszlo ; Enjeti, Prasad N. ; Pitel, Ira J.
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
Abstract :
In this paper, a new method is proposed to avoid acoustic-resonance-related instabilities in metal halide lamps when operated with a high-frequency electronic ballast. Angle modulation of the inverter switching pattern has been used as a vehicle to randomize lamp driving frequency and to limit lamp power spectrum below the instability threshold. The optimal modulating pattern is obtained by studying the angle-modulated spectra by periodic and random signals. Analysis is supported by simulations and verified experimentally with the ballasting of 250-W lamps
Keywords :
DC-AC power convertors; angle modulation; invertors; lamp accessories; metal vapour lamps; switching; white noise; 250 W; acoustic-resonance-related instability; angle modulation; high-frequency electronic ballast; high-frequency high-intensity discharge lamp ballasts; instability threshold; inverter switching pattern; lamp driving frequency; lamp power spectrum; metal halide lamps; optimal modulating pattern; periodic signals; random signals; white noise modulation; Acoustic noise; Electronic ballasts; Fault location; Frequency; High intensity discharge lamps; Inverters; Manufacturing; Pulsed power supplies; Resonance; Voltage;
Journal_Title :
Industry Applications, IEEE Transactions on
