Abstract

Normally, multiple-output Switched Mode Power Supplies (SMPSs) for Personal computers (PCs) depict extremely bad power quality indices at the utility interface such as total harmonic distortion (THD) of the input current being more than 80%, power factor being lower than 0.5 and output voltage regulation being very poor. The limits of harmonic emissions set by international power quality standards are being violated in such cases. A non-isolated power factor corrected (PFC) Zeta converter is being used here at the front end to improve the power quality of an SMPS for a PC. The front-end converter is able to reduce the 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. The performance of this SMPS has been simulated here.