论文信息 - A novel electrode power profiler for dimmable ballasts using DC link voltage and switching frequency controls

A novel electrode power profiler for dimmable ballasts using DC link voltage and switching frequency controls

A novel electrode power profiler for dimmable ballasts using series-resonant parallel-loaded inverter is presented. Dimming of the fluorescent lamp is primarily based on reducing the dc link voltage. Variations of the electrode power (due to the decrease in the lamp current) during dimming is compensated by changing the switching frequency of the inverter, so that the resonant tank circuit current is also varied. The current gradient along the electrode, which is due to the distributed lamp current property on the electrode, is deliberated in formulating the power and voltage models of the electrode. As the electrode heating relies on two near-orthogonal current components including the lamp current and the resonant tank circuit current, a simple feedback control is developed to derive the electrode power and program the electrode power. Experimental results of a T8 36 W prototype are verified with theoretical predictions.

[1] S. Fancher,et al. Fluorescent Lamp High Frequency Reference Ballast Operation and Starting , 1997 .

[2] J. Waymouth. Electric Discharge Lamps , 1971, Nature.

[3] S. Ben-Yaakov,et al. An electronic ballast for fluorescent lamps with no series passive elements , 2001, APEC 2001. Sixteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.01CH37181).

[4] Henry Shu-Hung Chung,et al. An electronic ballast with wide dimming range, high PF, and low EMI , 2001 .

[5] Thermal Model of the Fluorescent Lamp Electrode , 1989 .

[6] T. F. Lin,et al. Designing a dimmable electronic ballast with voltage control for fluorescent lamp , 1999, ISIE '99. Proceedings of the IEEE International Symposium on Industrial Electronics (Cat. No.99TH8465).

[7] E. E. Hammer,et al. Cathode Fall Voltage Relationship with Fluorescent Lamps , 1995 .

[8] Henry Shu-Hung Chung,et al. A comparative study on dimming control methods for electronic ballasts , 2001 .

[9] W. Denz,et al. Specifications for the Operation of Preheated Cathode Fluorescent Lamps on Electronic Ballasts , 1994 .

[10] Tsai-Fu Wu,et al. Improved start-up scenario for single-stage electronic ballast , 2000 .

[11] K. Misono. Cathode Fall Voltage of Low-Current Fluorescent Lamps , 1991 .

[12] S. Hui,et al. Practical evaluation of dimming control methods for electronic ballasts , 2003, 38th IAS Annual Meeting on Conference Record of the Industry Applications Conference, 2003..