Title :
Analysis and Design Method for High-Frequency Self-Oscillating Electronic Ballasts
Author :
Flores-García, Efrén ; Ponce-Silva, Mario ; Vela-Valdés, Luis Gerardo ; Juarez, Mario A. ; Hernández-González, Leobardo
Author_Institution :
Dept. of Electron. Eng., Nat. Center for Res. & Technol. Dev. (CENIDET), Cuernavaca, Mexico
Abstract :
In this paper, the analysis and design methodology of a high-frequency self-oscillating (SO) electronic ballast with lamp current control are presented. SO electronic ballasts have two important drawbacks: First, the lamp current varies according to the ac input voltage, causing undesired effects in the lamp brightness, and second, the design method lacks precision at very high frequency operation (greater than 200 kHz) mainly due to the parasitic capacitance. The ballast is modeled by using the descriptive function method and the extended Nyquist criterion; the model of the ballast includes a control circuit and takes into account the high-frequency effect of the MOSFET parasitic capacitance . Finally, experimental results of a 38-W SO electronic ballast prototype with lamp current control for high-intensity discharge lamps are presented to validate the analysis and the proposed methodology. The switching frequency is selected at 2 MHz in order to avoid the acoustic resonance problem.
Keywords :
MOSFET; Nyquist criterion; electric current control; lamp accessories; switching convertors; MOSFET parasitic capacitance; Nyquist criterion; ac input voltage; discharge lamps; high-frequency electronic ballasts; lamp brightness; lamp current control; power 38 W; self-oscillating electronic ballasts; switching frequency; Electronic ballasts; High intensity discharge lamps; Inductance; Logic gates; Resonant frequency; Stability analysis; Switching frequency; Electronic ballast; lighting; power electronics; resonant inverters;
Journal_Title :
Industry Applications, IEEE Transactions on
DOI :
10.1109/TIA.2011.2168801