Abstract
In energy efficient system designs, LED lighting leads to reduction in global energy demand. This paper proposes a high brightness, high efficiency, dimmable LED driver based on linear current regulator technology for DC grid distribution systems. The proposed driver has excellent characteristics like highest lumen per watt, long lifetime, high reliability, compact, low cost, both environmental and user friendly which makes it suitable for lighting applications. Steady state and small signal model of the proposed driver are performed which helps in minimizing ground current and accurate compensator design, respectively. These two modelling approaches result in the optimization of both footprint and cost of the driver. The performance of the proposed 20W driver is modeled using real-time simulation in spice software. Experimental prototype is developed to validate the performance of the proposed driver for different dimming levels and achieves a maximum efficiency of 97%.
Highlights
Increasing energy demand is driving researchers to develop energy efficient systems to fulfill the needs with lesser energy utilization
In comparison to AC grid, DC Distributed Systems (DCDS) shows a significant improvement in energy efficiency, reliability and economic savings, especially, with the integration of renewable energy sources to the distribution systems [1], [2]
Single-stage LED driver consists of DC – DC converter controlled to achieve power factor correction and constant output current
Summary
Increasing energy demand is driving researchers to develop energy efficient systems to fulfill the needs with lesser energy utilization. A 48V DC voltage level for utility grid is not suitable because the load current requirement will be high, resulting in oversizing of cables, increased power losses and higher overall cost. Single-stage LED driver consists of DC – DC converter controlled to achieve power factor correction and constant output current. LED driver of switch mode type offer better regulation of output current with high power density; it uses passive elements (LC). LED drivers are based on two stages conversion: AC-DC conversion followed by switched mode DC-DC With this configuration, dimming operation for every light fixture is difficult to achieve. A passive component-less topology based linear regulated dimmable LED driver, for distributed DC grid, is proposed. The proposed topology of LED driver is suitable for a wide range of applications ranging from sports complex to commercial tech parks etc
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