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Solar Powered Lighting for Overhead Highway Signs.
| 题名： | Solar Powered Lighting for Overhead Highway Signs. |
| 作者： | Patangia-H.C. |
| 关键词： | *Overhead-signs; *Fluorescent-lamps; *Light-emitting-diodes; *Highway-signs; *Highway-lighting.;Photovoltaic-cells; Cost-; Traffic-safety; Street-lighting; Solar-cells; Electric-batteries. |
| 摘要： | The purpose of the research is to design and develop a low cost solar powered lighting system for overhead highway signs with a view to improving night visibility especially under poor driving conditions, and enhance highway safety. Two lighting systems have been researched, developed and tested: one system employs LED technology and the other uses CFL technology. The commercial CFL lights are ac powered and for dc operation with photo-voltaic energy, a new inverter design has been implemented. The inverter efficiency is better than 95%and the total harmonic distortion (THD) is less than 15%. The design incorporates SLA (Sealed Lead Acid) batteries for energy storage. The inverter is essential when hybrid operation (solar as well as ac line) is desired. For stand-alone solar application, it has been shown that the CFL lights can be directly operated from dc source and thus eliminate the inverter to minimize power losses. Further, a new dc operated ballast configuration was also investigated for CFL lighting to increase its luminous efficacy. The LED system employs pulse-width modulation technique controlled by a micro-controller for its operation. Both the systems incorporate a power management controller to adjust the lighting effect to compensate for weather conditions for days with inadequate solar charging. The two lighting systems have been deployed to illuminate two signs (Memphis and Remington Exit) on Interstate 40 East at the Remington exit. The CFL technology was used for the Remington Exit sign with a lighting area of 50-60 sq. ft. This report presents the design and development of the two systems, their outdoor deployment results, and recommendations for futrure research. |
| 报告类型： | 科技报告 |
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