S.Y. Tang

National Sun Yat-sen University, Kaohsiung, Kaohsiung, Taiwan

Are you S.Y. Tang?

Claim your profile

Publications (4)0 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: This paper aims at investigating the effects of the lamp current and power on the electrical behavior, the spectral distribution and the produced luminance. Based on the results observed, the starting transient characteristics can be well understood and the times for entering thermal equilibrium and the steady-state light output can be defined in a more reasonable manner. Experimental evidence shows that the glow-to-arc transition stage takes most of the transient period, and the starting time of a metal halide lamp can be effectively shortened by increasing the lamp current during the glow-to-arc transition stage. More importantly, a specifically-regulated operating power enables the lamp to further enhance luminance, and hence to reduce the starting transient period remarkably.
    Power Conversion Conference - Nagoya, 2007. PCC '07; 05/2007
  • [Show abstract] [Hide abstract]
    ABSTRACT: Experiments are conducted to investigate the starting characteristics of metal halide lamps ballasted with a controllable low-frequency square-wave current. Several starting scenarios are examined to learn the different acceleration schemes of the start-up transient. Experimental evidence shows that the starting time of a metal halide lamp can be effectively shortened by increasing the lamp current during the glow-to-arc transition stage. More importantly, a specifically-regulated operating power enables the lamp to further enhance the producing of luminance, and hence greatly reduce the starting transient period
    Industrial Electronics, 2006 IEEE International Symposium on; 08/2006
  • S.Y. Tang, C.S. Moo, C.R. Lee
    [Show abstract] [Hide abstract]
    ABSTRACT: High-frequency operating characteristics of small-wattage metal halide lamps are investigated. Included are the spectral energy, the color temperature, the acoustic resonance, and the luminous efficiency. Two electronic ballasts are built to drive the lamps with the sinusoidal current and the square-wave current, respectively. The experiments are conducted on tested lamps of 70 W and 150 W in a frequency range from 20 kHz to 300 kHz. Comparisons on the operating characteristics between two electronic ballasts and the effects of operating frequency are discussed from the experimental results
    Power Electronics and Drives Systems, 2005. PEDS 2005. International Conference on; 02/2006
  • [Show abstract] [Hide abstract]
    ABSTRACT: An approach is proposed to detect and protect the electronic ballasts from abnormal operations when fluorescent lamps are coming to their life-ends. A protection circuit is designed to identify the abnormal operation by detecting the dc component on the lamp voltage. A design example is used to illustrate the operations of the protection method. Experimental results demonstrate that the detection and protection can function effectively under various fault conditions.
    Industry Applications Conference, 2005. Fourtieth IAS Annual Meeting. Conference Record of the 2005; 11/2005