A New Current Balancing Methods of CCFL for LCD TV Backlight

LCD 백라이트를 위한 새로운 CCFL 병렬구동 인버터

  • Published : 2006.08.01

Abstract

Cold cathode fluorescent lamps (CCFL) show complex characteristics, which make it difficult to drive them in parallel. In this paper, a multi-lamp driving scheme is proposed to drive multiple lamps for LCD back light to reduce output current unbalance. This propose system is composed of parallel CCFLs, series transformers. The driving system adopts only one backlight inverter to drive multi cold cathode fluorescent lamps (CCFL). Moreover the circuit introduces a multi-lamp driving transformer to reduce lamp-current imbalance. The validity of the proposed scheme is confirmed by the simulated and experimental results.

References

  1. Yiyoung Sun, 'Using PSpice to Determine Lamp Current Variation Due to Electronic Ballast Component Tolerances,' IEEE Transactions on Industry Applications, Vol.33, No.1, pp. 252-256, jan/Feb, 1997 https://doi.org/10.1109/28.567126
  2. Jole A. Donahue,P.E. and Milan M. Jovanovic, 'The LCC inverter as a cold cathode fluorescent lamp driver', APEC 1994, pp.427-433
  3. Lin et al., 'Lamp Driving Topology,' United States Patent, US6,559,606
  4. Ushijima et al., 'INVERTER CIRCUIT FOR DISCHARGE LAMPS FOR MULTI-LAMP LIGHTING AND SURFACE LIGHT SOURCE SYSTEM,' United States Patent, US20040155596
  5. Mu-Shen Lin, Wen-jung Ho, Fu-Yuan Shin, Dan Y.Chen and Yan-Pei Wu : A Cold-Cathode Fluorescent Lamp Driver Circuit with Synchronous Primary-Side Dimming Control, IEEE TRANS. ON Industrial Electronics. Vol. 45. No. 2. pp.249-255, April 1998 https://doi.org/10.1109/41.681223