High-Efficiency Asymmetrical Half-Bridge Converter Without Electrolytic Capacitor For Low-Output-Voltage Ac–Dc Led Driver For Street Lighting
|International Journal of Electrical and Electronics Engineering|
|© 2014 by SSRG - IJEEE Journal|
|Volume 1 Issue 5|
|Year of Publication : 2014|
|Authors : Manish.G.Rathi, Avinash.J.Dudgi|
Manish.G.Rathi, Avinash.J.Dudgi, "High-Efficiency Asymmetrical Half-Bridge Converter Without Electrolytic Capacitor For Low-Output-Voltage Ac–Dc Led Driver For Street Lighting" SSRG International Journal of Electrical and Electronics Engineering 1.5 (2014): 13-19.
Manish.G.Rathi, Avinash.J.Dudgi,(2014). High-Efficiency Asymmetrical Half-Bridge Converter Without Electrolytic Capacitor For Low-Output-Voltage Ac–Dc Led Driver For Street Lighting. SSRG International Journal of Electrical and Electronics Engineering 1.(5), 13-19.
There is a trend to shift the lighting source towards light-emitting diode due to the outstanding performance and efficiency, the best example is High-brightness light-emitting diodes (LEDs). To utilize their features, large number of solutions for supplying LED strings are coming out. One-stage solutions are cost effective, but compared to two-stage and three-stage solutions their efficiency is low because they have to serve many tasks like; power factor correction (PFC), galvanic isolation and current regulation, so switching stress will be more and hence the losses. Two-stage and three-stage solutions are preferred option when supplying several strings at a time. Even though two-stage and three-stage solutions have higher cost, they are efficient because each stage is optimized for one task only, and reliability can be obtained by eliminating the use of electrolytic capacitor in them. In this paper, a three-stage solution for street lighting application is proposed, in which power factor correction is achieved by boost converter, while the galvanic isolation by electronic transformer (second stage), and current regulation by two-input buck converter (TIBuck) in the third stage. DSPIC30F4011 microcontroller is used to provide switching frequency for the switches used in the converter. Experimental results obtained with a 40- W prototype show efficiency as high as 93% for the whole topology stages.
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AC-DC power converters, electronic transformer, high efficiency, light-emitting diode (LED) lighting, three-stage topology, two-input buck.