Title :
HPS electronic ballast with modulation index control
Author :
Morais, Lenin M F ; Garcia, Pedro F Donoso ; Seleme, Seleme I., Jr. ; Cortizo, Porfírio C.
Author_Institution :
Fed. Univ. of Minas Gerais, Belo Horizonte, Brazil
Abstract :
Acoustic resonance in HPS lamps can be avoided by using a controlled PWM inverter and third harmonic injection. The crest factor can also be reduced by harmonic injection. This paper proposes to use of the modulation index adjustment as a method of eliminating the transformer at the output of the ballast as well as maintaining the lamp nominal power during its lifetime. An ignitor for high-intensity discharge lamps based on forced oscillation via an external periodic voltage square wave supplied by a digitally controlled inverter is also presented.
Keywords :
PWM invertors; acoustic resonance; discharge lamps; lamp accessories; HPS electronic ballast; acoustic resonance avoidance; controlled PWM inverter; crest factor; digitally controlled inverter; external periodic voltage square wave; forced oscillation; high-intensity discharge lamps; modulation index adjustment; modulation index control; third harmonic injection; Electronic ballasts; Fault location; Fluctuations; Frequency; High intensity discharge lamps; Power harmonic filters; Power system harmonics; Pulse width modulation inverters; Resonance; Voltage; Acoustic resonance avoidance; HPS lamps; PWM; harmonic injection;
Conference_Titel :
Power Electronics and Applications, 2009. EPE '09. 13th European Conference on
Conference_Location :
Barcelona
Print_ISBN :
978-1-4244-4432-8
Electronic_ISBN :
978-90-75815-13-9
