LED DRIVER WITH COST EFFECTIVE HIGH EFFECIENCY

A driver circuit has been proposed which has been tested by simulation software MULTISIM which shows the efficiency of the circuit of about 90%.This project as a form of paper has been sent for the approval to be published in IEEE journal. To give a preview of the project, the abstract is furnished below:- An LED driver refers to an electrical device which helps to regulate the power to an LED or to an array of LEDs. The LED driver adapts to the needs of the LED, by providing a continuous quantity of power to the LED when its electrical properties vary. LED's are as a matter of fact sensitive to the voltage used to power them (i.e. the current changes a lot with a small change in voltage).To avert the LED from becoming unstable due to voltage changes, an LED driver is needed. An LED driver is a self-contained power supply which has outputs that are affianced to the electrical characteristics of the LED or to the array of LEDs. LED drivers may offer dimming by means of pulse width modulation circuits and may have different channels for separate control of different LEDs or LED arrays. Without the most suited driver, the LED may become hot and unstable, therefore causing poor performance or failure. This paper presents a novel approach to the design of a LED Driver using various power transistors, power mosfets, operational amplifier and feedback circuits. The experimental results demonstrate the power delivered to the LED at different supply voltages upholding the performance of the driver circuit proposed.