Title :
A Study on LED Retrofit Solutions for Low-Voltage Halogen Cycle Lamps
Author :
Alonso, J. Marcos ; Gacio, David ; Calleja, Antonio J. ; Ribas, Javier ; Corominas, Emilio López
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. de Oviedo, Gijón, Spain
Abstract :
In this paper, a study on LED retrofit solutions for low-voltage halogen cycle lamps is conducted. In the first part of this paper, a lamp based on a LED array is designed to operate in substitution of a 12-V/50-W halogen lamp, for lighting fixtures in which these lamps are supplied using a line transformer. The design includes the selection of an adequate LED array in terms of lumen output and color temperature and the calculation of the necessary heatsink to assure the correct operation of the LED lamp within the selected temperature range. In the second part of this paper, a passive converter based on a bridge rectifier and a limiting resistance is studied and tested in the laboratory. Next, an active solution based on a buck-boost converter operating in discontinuous conduction mode is designed and experimentally evaluated. Finally, a comparison in terms of input power factor, input current harmonic content, LED current ripple, LED current regulation, efficiency, and photometric characteristics is carried out.
Keywords :
LED lamps; heat sinks; power convertors; power factor; rectifying circuits; transformers; LED array; LED current regulation; LED current ripple; LED retrofit solutions; bridge rectifier; buck-boost converter; color temperature; current 50 A; discontinuous conduction mode; heat sink; input current harmonic content; input power factor; limiting resistance; line transformer; low-voltage halogen cycle lamps; passive converter; photometric characteristics; voltage 12 V; Arrays; Current measurement; LED lamps; Resistance; Temperature measurement; Voltage measurement; Active driver; LED lamps; buck–boost converter; low-voltage halogen lamps; passive driver; retrofitting;
Journal_Title :
Industry Applications, IEEE Transactions on
DOI :
10.1109/TIA.2012.2209852