International Journal of Modern Science and Technology

INDEXED IN 

ISSN 2456-0235

International Journal of Modern Science and Technology, 1(5), 2016, Pages 164-172. 


Design and Hardware Implementation of Current Controlled Integrated Double Buck Boost Converter for LED Driver Circuit

S. Ananda Balaji, T. D. Sudhakar
Department of Electrical and Electronics Engineering,St. Joseph’s College of Engineering, Chennai – 600 119. India.

Abstract
This paper introduces a light emitting diode (LED) driver circuit with current controlled integrated double buck boost converter. In a LED, small change in forward voltage can produce a disproportional large change in forward current, which in turn can cause variation in light output, as LED light output is proportional to current and is rated for current range. If nothing limits the current, the junction will fail due to the heat, which leads to thermal runaway. By driving LED light sources with a constant-current power supply the light output variation and life span issues resulting from voltage changes can be eliminated. This paper discusses about the converter operation and closed loop simulation in detail. From the designed values MATLAB simulation is done. The hardware design is focused on pulse generation circuit for converter. A microcontroller from microchip family PIC16F877A is used to implement controller design.  The output voltage is taken as feedback to control the PWM pulses to maintain optimal current in LED.

​​Keywords: ​Double Buck-Boost; PID Controller; Constant Current; Power LED Lamps. 

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