S.Y. Tang

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

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Publications (3)0 Total impact

  • J.H. Chen · K.S. Ng · C.S. Moo · S.Y. Tang · C.R. Lee
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    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
    No preview · Conference Paper · Aug 2006
  • S.Y. Tang · C.S. Moo · C.R. Lee
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    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
    No preview · Conference Paper · Feb 2006
  • S.Y. Tang · C.C. Lee · C.S. Moo · C.R. Lee · M.C. Sung
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    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.
    No preview · Conference Paper · Nov 2005