• Rafelia Fernandes
• Asha Kirana .M
• Annapoorna.M
• Pooja.C.Naik

There are many types of dc-dc converters. Buck converters can only reduce voltage, boost converters can only increase voltage and buck-boost, Cuk and SEPIC converters can increase or decrease the voltage. Buck-boost converters can be cheaper because they only require a single inductor and a capacitor. This often makes the buck-boost inefficient. Cuk converters solve both of these problems by using an extra capacitor an inductor. Both Cuk and buck-boost converter operation cause large amounts of electrical stress on the components, this can result in device failure or overheating. SEPIC converters solve both of these problems. The SEPIC converter allows a range of dc voltage to be adjusted to maintain a constant voltage output. SEPIC converter is used to overcome the limitation of conventional buck boost converter like inverted output , pulsating input current , high voltage stress make it unreliable for wide range of operation. The single-ended primary inductor converter (SEPIC) is a type of DC/DC converter allowing the electrical potential at its output to be greater than, less than, or equal to that at its input. The output of the SEPIC is controlled by the duty cycle. In this project we design and implement a SEPIC converter with full duty cycle control which is supported by its simulation. With the advantages of superior longevity, fast response, small size and color rendering, light-emitting diodes (LEDs) have been widely used for various lighting applications, such as signage lights,   traffic lights,   liquid crystal display television (LCD TV) back lights and so on. Since the package and costing technology are getting more and more mature, the cost of LEDs decreases greatly, with a great potential to replace existing lighting sources such as fluorescent lamps.

SEPIC, Buck, Boost, Cuk convertors, LED, LCD.

"Modified Bridgeless SEPIC Converter", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 5, page no.445-450, May-2019, Available :http://www.jetir.org/papers/JETIR1905N66.pdf

"Modified Bridgeless SEPIC Converter", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 5, page no. pp445-450, May-2019, Available at : http://www.jetir.org/papers/JETIR1905N66.pdf