Abstract

This paper proposes a three-phase electronic ballast with current-equalization function. By properly designing the resonant tank and the values of the resonant inductance and resonant capacitance, the current difference between lamps can be significantly reduced. Hence, current-equalization can be achieved by means of impedance-matching. Without an additional current-equalization circuit, the cost of the proposed circuit is reduced due to fewer components. The analysis and design of the proposed circuit will be presented in this paper. Finally, the proposed three-phase electronic ballast with current-equalization function will be implemented to validate and demonstrate the performance and feasibility of the proposed circuit.

© 2006 IEEE

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Electron. Lett. (2)

C. G. Kim, K.-C. Lee, B. H. Cho, "Driving cold cathode fluorescent lamps in parallel," Electron. Lett. 41, 163-164 (2005).

M.-S. Lin, J.-B. Lio, D. Y. Chen, W.-S. Feng, "Primary-side dimming control driver for cold-cathode fluorescent lamps," Electron. Lett. 1334-1335 (1996).

Other (11)

D. Cretu, W. G. Dunford, M. Edmunds, "A comparison of three-phase resonant and PWM converter for high current, high power application," Proc. IEEE Appl. Power Electron. Conf. & Expo. (1997) pp. 631-637.

Fairchild Semiconductor Corp.USA“Dual LCD backlight inverter drive IC,” Appl. Note AN4136 (2005).

M. A. Dalla Costa, M. L. Landerdahl, Jr., R. N. do Prado, "Independent multi-lamp electronic ballast," Proc. IEEE Ind. Appl. Conf. (2002) pp. 1065-1070.

C. Chang, Multiple lamp LCD backlight driver with coupled magnetic components U.S. Patent 6 310 444 B1 (2001).

Y.-C. Chiang, W.-H. Lin, K.-T. Chou, Power supply system for multiple loads and driving system for multiple lamps U.S. Patent 6 420 839 B1 (2002).

Y.-H. Tsai, Multiple CCFL current balancing scheme for single controller topology U.S. Patent 6 459 216 B1 (2002).

R. L. Lin, Lamp current-equalization techniques with phase-locked loop control for cold cathode florescent lamp Taiwan Patent Appl. 94124601 (2005).

W.-H. Lin, C.-Y. Chen, D.-K. Chang, C.-C. Hsu, Multi-lamp driving system U.S. Patent 6 534 934 B1 (2003).

C. Liu, F. Teng, C. Hu, Z. Zhang, "LCLC resonant converter for multiple lamp operation ballast," Proc. IEEE Applied Power Electron. Conf. and Expo. (2003) pp. 1209-1213.

H. Notohamiprodjo, T. Marinelli, Sensing and balancing currents in a ballast dimming circuit U.S. U.S. Patent 6 472 876 B1 (2002).

C.-C. Chen, Y.-T. Chuang, Y.-M. Chen, T.-F. Wu, "Multi-phase multi-lamp driving system for LCD back light," Proc. IEEE Power Electron. Specialist Conf. (2004) pp. 1823-1827.

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