دانلود رایگان مقاله انگلیسی توپولوژی مجتمع مبدل DC-DC برای سیستم روشنایی خیابان - IEEE 2018

Abstract

This work proposes a LED luminaire for street lighting based on modular drivers. Each module consists of a driver composed by two integrated DC-DC converters. The first one is a buck-boost converter, responsible for the power factor correction, and the second is a buck converter, which controls the load current. Both of the converters operate in the discontinuous conduction mode of current. In order to make the system robust against failure, each driver supplies an independent set of power LEDs. Thus, in case of failure of one or more drivers, the system is not completely compromised. The design of the electronic drivers is presented. Experimental results of a prototype with rated power of 50 W (two modules of 25 W) are performed in order to show the feasibility of the proposed solution.

VII. CONCLUSION

In this paper a topology for street lighting systems based on LED modular drivers has been presented. A luminaire composed by modules avoids the total failure of the lamp, maintaining its operation with a lower power than the nominal one until the system maintenance. A prototype of 50 W was designed, implemented, tested and the presented experimental results were satisfactory. The bus capacitance value was decreased by increasing the ripple at the bus voltage around 50% and due to the reduced power of each module, which allowed the use of a non-electrolytic capacitor. In order to limit the LED current ripple, a digital PI controller was implemented. The proposed modular street lighting lamp, which relies on low power modules, allows to maintain the main features of the lamp as close as possible to the characteristics of one individual module, regardless of the total lamp power, for instance, efficiency and absence of electrolytic capacitor. It makes the proposed solution suitable for efficient street lighting systems based on LED lamps.