Title :
High-frequency electronic ballast with auto-tracking control for metal halide lamps
Author :
Moo, Chin S. ; Huang, Chunk K. ; Hsiao, Ying N.
Author_Institution :
Dept. of Electr. Eng., Nat. Sun Yat-Sen Univ., Kaohsiung, Taiwan
Abstract :
An auto-tracking control strategy is proposed for high-frequency electronic ballasts to operate the metal halide lamp at a frequency free of acoustic resonance. In case the acoustic resonance should happen, the variation in the lamp voltage is detected and then the operating frequency is changed step by step until a frequency with stable operation is located. In cooperating with the detection circuit, the control strategy is implemented on an electronic ballast with the half-bridge class-D load-resonant inverter. A prototype designed for 70 W metal halide lamps is used to illustrate the operations of the auto-tracking control.
Keywords :
acoustic resonance; bridge circuits; frequency control; halides; invertors; lamp accessories; lighting control; metal vapour lamps; voltage measurement; 70 W; acoustic resonance detection; auto-tracking control; control strategy; detection circuit; half-bridge class-D load-resonant inverter; high-frequency electronic ballast; lamp voltage detection; metal halide lamps; operating frequency; Acoustic signal detection; Circuit topology; Electronic ballasts; Fluorescent lamps; Frequency; Laboratories; Power electronics; RLC circuits; Resonance; Resonant inverters;
Conference_Titel :
Industry Applications Conference, 2003. 38th IAS Annual Meeting. Conference Record of the
Print_ISBN :
0-7803-7883-0
DOI :
10.1109/IAS.2003.1257668
