A Buck boost-Buck PFC rectifier as an LED driver

Pattanaik, Biswajit (2015) A Buck boost-Buck PFC rectifier as an LED driver. Masters thesis, Indian Institute of Technology Hyderabad.

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Abstract

The objective of this thesis is to design a buck boost-buck power factor corrector (PFC) to drive a string of High Brightness Light Emitting Diodes (HB-LEDs). Conventional buck-boost converter is used for power factor correction, but it suffers from issues like the inverted polarity of the output voltage, floating drive requirement for its active switch. These issues have been addressed in the proposed PFC converter by an integration of buck-boost and buck topologies. The PFC converter is able to drive load, with nearly unity power factor, significantly low input current total harmonic distortion (THD) with higher efficiency of power conversion. The theoretical analysis and operation of the proposed converter with a 20W LED load have been verified by simulation in MATLAB/Simulink. Finally, the experimental results of a laboratory prototype with an output power of 20W supplied from 110v/50Hz are provided to validate the simulation results.

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