Small signal characterization of fluorescent lamps in dimmed operation

In recent bibliography, several small signal models for fluorescent lamps have been presented. These models are focused in the characterization of the lamp small signal dynamic impedance at nominal power level. This impedance can only be used to analyze the lampballast interaction at nominal power. However, in dimming ballasts, the interaction between lamp and ballast can lead to system instability at reduced power operation. In present paper, the small signal model of a compact fluorescent lamp is obtained at different power levels. At each power level, the parameters of the single-pole, single-zero model are obtained. The static gain, pole and zero frequencies of the model are calculated and fitted to a power dependent polynomial expression. Using the generalized multi-frequency averaging technique the stability of a voltage controlled resonant inverter is analyzed. The stability margin of the system is calculated using the proposed model and verified using an experimental prototype.

[1]  A.J. Calleja,et al.  Arc Dynamic Stabilization in Low-Frequency Square-Wave Electronic Ballast for Metal Halide Lamps , 2007, IEEE Transactions on Power Electronics.

[2]  Slobodan Cuk,et al.  Negative incremental impedance and stability of fluorescent lamps , 1997, Proceedings of APEC 97 - Applied Power Electronics Conference.

[3]  J. Cardesin,et al.  Small-Signal Modeling of Discharge Lamps Through Step Response and Its Application to Low-Frequency Square-Waveform Electronic Ballasts , 2007, IEEE Transactions on Power Electronics.

[4]  S. Buso,et al.  Small-Signal Analysis of Cold Cathode Fluorescent Lamp Ballasts , 2005, IEEE Transactions on Power Electronics.

[5]  A.J. Calleja,et al.  Design considerations for optimum ignition and dimming of fluorescent lamps using a resonant inverter operating open loop , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).

[6]  A. Stanković,et al.  Multifrequency averaging of DC/DC converters , 1999 .

[7]  M. Ponce,et al.  Stabilization of HID Lamps Using DC–DC Converters With an Open Loop Control , 2007, IEEE Transactions on Power Electronics.

[8]  S. Ben-Yaakov,et al.  Envelope simulation by SPICE compatible models of electric circuits driven by modulated signals , 2000, APEC 2000. Fifteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.00CH37058).

[9]  Raul Rabinovici,et al.  Envelope simulation by SPICE-compatible models of linear electric circuits driven by modulated signals , 2001 .

[10]  J. Ribas,et al.  Analysis of lamp-ballast interaction using the multi-frequency-averaging technique , 2001, 2001 IEEE 32nd Annual Power Electronics Specialists Conference (IEEE Cat. No.01CH37230).

[11]  J. M. Noworolski,et al.  Generalized averaging method for power conversion circuits , 1990, 21st Annual IEEE Conference on Power Electronics Specialists.