Title :
White-noise modulation of high-frequency high-intensity discharge lamp ballasts
Author :
Laskai, Laszlo ; Enjeti, Prasad ; Pitel, Ira J.
Author_Institution :
Power Electron. Lab., 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 watt lamps
Keywords :
DC-AC power convertors; acoustic resonance; discharge lamps; invertors; lamp accessories; metal vapour lamps; modulation; simulation; switching; white noise; acoustic resonance related instabilities; angle modulation; high-frequency; high-frequency electronic ballast; high-intensity discharge lamp ballasts; inverter switching pattern; lamp driving frequency randomisation; lamp power spectrum limiting; metal halide lamps; periodic signals; random signals; white-noise modulation; Acoustic noise; Acoustic waves; Electronic ballasts; Fault location; Frequency; High intensity discharge lamps; Manufacturing; Pulsed power supplies; Resonance; Voltage;
Conference_Titel :
Industry Applications Society Annual Meeting, 1994., Conference Record of the 1994 IEEE
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-1993-1
DOI :
10.1109/IAS.1994.377699
