Title :
Ignition design of digital ballast for low wattage metal halide lamps
Author :
Zhuang, Zuo ; Dianguo, Xu
Author_Institution :
Dept. of Electr. Eng., Harbin Inst. of Technol., China
Abstract :
In this paper, in order to develop economical ballast for low wattage metal halide (MH) lamps without an external ignitor, a half-bridge type low-frequency square-wave digital electronic ballast is proposed. A cheap 8-bit microcontroller is employed to improve the starting performance and operate the MH lamp without acoustic resonance in steady state. Adaptive ignition strategy helps the proposed system to overcome impact of the resonant parameters tolerance. The adoption of third harmonic LC resonance attenuates the inherent defect of digital control caused by the discreteness and improves the refinement of igniting voltage greatly. A prototype of the digital electronic ballast for 70W metal halide lamp has been built, and the experimental result proved its validity.
Keywords :
acoustic resonance; digital circuits; digital control; discharge lamps; lamp accessories; microcontrollers; 70 W; 8 bit microcontroller; acoustic resonance; adaptive ignition strategy; digital ballast; digital control; external ignitor; half bridge type electronic ballast; ignition design; low frequency electronic ballast; low wattage lamps; metal halide lamps; square wave electronic ballast; steady state; third harmonic LC resonance; Buck converters; Circuit topology; Electronic ballasts; Ignition; Inductors; Lamps; Relays; Resonance; Steady-state; Voltage;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2006. APEC '06. Twenty-First Annual IEEE
Print_ISBN :
0-7803-9547-6
DOI :
10.1109/APEC.2006.1620665
