文件名称：电气工程英语文献 energy saving for fluorescent lighting in commercial buildings
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更新时间：2012-05-01 07:01:25
energy
energy saving for fluorescent lighting in commercial buildings Where Va represents the amplitude of the square wave. Although the lamp voltage can be approximated as a square wave, Va remains nearly constant during each half cycle, which can be simplified to a constant value. Hence, in contrast with the lamp current, Va can be assumed to be independent of the input voltage variations [13]. Hence the voltage drop across the ballast can be expressed as (3).