Abstract

This paper proposes a phase-locked loop (PLL) control scheme for the electronic ballast with a current-equalization network. The PLL control scheme involves detecting the phase signals of both the resonant-tank input voltage and the two leakage-inductor terminals in the transformer; then the operating frequency of the circuit continuously tracks the resonant frequency as a reference frequency. Based on the tracked reference frequency, the required voltage gain of the resonant tank is regulated by offsetting the operating frequency. Consequently, the operating frequency is lower than the resonant frequency to ensure the zero-voltage-switching (ZVS) condition for less turn-on switching losses on the switches. This paper presents the analysis of the proposed PLL control scheme. Finally, the current-equalizing ability in the dimming range is demonstrated by experiments in order to validate and demonstrate the performance and feasibility of the proposed circuit.

© 2006 IEEE

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  1. M. A. D. Costa, M. L. Landerdahl Jr., R. N. do Prado, "Independent multi-lamp electronic ballast," Proc. IEEE Industry Applications Conf. (2002) pp. 1065-1070.
  2. C. Chang, Multiple lamp LCD backlight driver with coupled magnetic components U.S. U.S. Patent 6 310 444 B1 (2001).
  3. 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 Electronics Specialists Conf. (2004) pp. 1823-1827.
  4. Y. H. Tsai, Multiple CCFL current balancing scheme for single controller topology U.S. Patent 6 459 216 B1 (2002).
  5. R. L. Lin, Lamp current-equalization techniques with phase-locked loop control for cold cathode fluorescent lamp Taiwan Taiwan Patent Appl. 94 124 601 (2005).
  6. W.-H. Lin, C.-Y. Chen, D.-K. Chang, C.-C. Hsu, Multi-lamp driving system U.S. Patent 6 534 934 B1 (2003).
  7. T. Zaitsu, Converter comprising a piezoelectric transformer and a switching stage of a resonant frequency different from that of the transformer U.S. Patent 5 768 111 (1996).
  8. F. Rodriguez, J. Ribas, J. M. Alonso, "Analysis and design of the LCC-parallel series inverter with resonant current control as HPS lamp ballast," Proc. IEEE Power Electronics Specialists Conf. (2001) pp. 980-985.
  9. C. S. Moo, H. L. Cheng, T. F. Lin, H. C. Yen, "Designing a dimmable electronic ballast with voltage control for fluorescent lamp," Proc. IEEE Int. Symp. on Industrial Electronics (1999) pp. 786-791.
  10. M. Kazimierczuk, D. Czarkowski, Resonant Power Converters (Wiley, 1995).

Other (10)

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

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

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 Electronics Specialists Conf. (2004) pp. 1823-1827.

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 fluorescent lamp Taiwan Taiwan Patent Appl. 94 124 601 (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).

T. Zaitsu, Converter comprising a piezoelectric transformer and a switching stage of a resonant frequency different from that of the transformer U.S. Patent 5 768 111 (1996).

F. Rodriguez, J. Ribas, J. M. Alonso, "Analysis and design of the LCC-parallel series inverter with resonant current control as HPS lamp ballast," Proc. IEEE Power Electronics Specialists Conf. (2001) pp. 980-985.

C. S. Moo, H. L. Cheng, T. F. Lin, H. C. Yen, "Designing a dimmable electronic ballast with voltage control for fluorescent lamp," Proc. IEEE Int. Symp. on Industrial Electronics (1999) pp. 786-791.

M. Kazimierczuk, D. Czarkowski, Resonant Power Converters (Wiley, 1995).

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