Title :
A unity power factor high frequency parallel resonant electronic ballast
Author :
Lee, Chul H. ; Joung, Gyu B. ; Cho, Gyu H.
Author_Institution :
Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Seoul, South Korea
Abstract :
An electronic-ballast circuit that operates at a 20 kHz resonant frequency with zero voltage switching is described for a metal halide lamp. In order to minimize the switching loss, the ballast employs the zero-voltage switching, scheme in which the switching instants are synchronized with the voltage zero crossing points. For a base driver, self-oscillation is used. The base driver and controller consist of one leg of a transformer, two resistors, and two capacitors, making the ballast more compact, lighter, and more reliable. A prototype ballast for a 175 W metal halide lamp has been fabricated and tested. All the features of the ballast have been verified experimentally.<>
Keywords :
capacitors; lamp accessories; metal vapour lamps; resistors; switching; transformers; 175 W; 20 kHz; HF; base driver; capacitors; controller; high frequency parallel resonant electronic ballast; lamp accessories; metal halide lamp; power factor; resistors; self-oscillation; transformer; zero voltage switching; Driver circuits; Electronic ballasts; Frequency synchronization; Lamps; RLC circuits; Reactive power; Resonance; Resonant frequency; Switching loss; Zero voltage switching;
Conference_Titel :
Industry Applications Society Annual Meeting, 1990., Conference Record of the 1990 IEEE
Conference_Location :
Seattle, WA, USA
Print_ISBN :
0-87942-553-9
DOI :
10.1109/IAS.1990.152329
