Power Factor Correction using Zeta Converter for SMPS and BLDC Motor drive Applications

Abstract

BRUSHLESS dc (BLDC) motors have become increasingly popular in the past decade due to the advantages such as high efficiency, high power density, compact size, high ruggedness, low maintenance requirements, and their immunity to electromagnetic interference (EMI) problems. Switched Mode Power Supply (SMPS) is an integral part of the computer that converts ac to multiple numbers of suitable dc voltages to impart power to different parts of the PC. It contains a diode bridge rectifier (DBR) with a capacitor filter followed by an isolated dc-dc converter to achieve multiple dc output voltages of different ratings. In this paper, a non-isolated power factor corrected (PFC) converter is being proposed to be used at the front end to improve the power quality of an SMPS for a PC. The front-end converter is able to reduce the 100-Hz ripple in its output that is being fed to the second stage isolated converter. The performance of the front-end Zeta converter is evaluated in three different operating conditions to select the best operating condition for the proposed SMPS system. The uncontrolled charging and discharging of the capacitor result in a highly distorted, high crest factor, periodically dense input current at the single phase ac mains; this violates the limits of international power quality (PQ) standards. The proposed concept is implemented with both BLDC and SMPS applications and This can be applied for BLDC motor application, i.e. Power Factor Correction using Zeta Converter for SMPS feeding Motor load results are verified using Matlab/Simulink software.