By: Steve Mappus
As seen in Design News, 4/21/14 (www.designnews.com)
High-power industrial Light Emitting Diode (LED) fixtures use series-parallel strings of High Brightness (HB) LEDs to produce superior lighting fixtures compared to traditional, “ballast-based” systems. HB-LEDs are configured in series or series-parallel strings. They require constant-current, constant-voltage (CC-CV) power supplies, operating within the range of 50W to 200W. Industrial LED lighting systems operating from a universal, offline AC voltage must include the ability to maintain a high power factor over a wide range of input and output operating conditions. For example, meeting the Department of Energy (DOE) Energy Star Program for solid-state lighting explicitly requires a minimum power factor of 0.7 and 0.9, respectively, for residential and commercial fixtures greater than 5W. In addition, the European standard, EN61000-3-2, for Class C lighting equipment imposes stringent THD limits most easily met using active power factor correction (PFC).
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