Abstract

The aim of this paper is to investigate the power factor correction (PFC) of Boost Converter under an average current-mode control. Boost converter topology is used to accomplish this active power-factor correction in many discontinues/ continuous modes. The boost converter is used usually it is easy to implement and works well. In this paper comparative evaluation of different techniques for harmonic reduction in input current of ac-dc converter is presented. Converters employing as side switching and boost converter is simulated in PSIM Software. Average current tracks the current program with a high degree of accuracy. This is especially important in high power factor pre-regulators, enabling less than 5% harmonic distortion to be achieved with a relatively small inductor. In fact, average current mode control function works well even when the mode boundary is crossed into the discontinuous mode at low current levels. The outer voltage control loop is oblivious to this mode change. Firstly I have simulated only single bridge rectifier without any use of converter to find the THD (Total Harmonic Distortion) at input and then applied open loop converter with single bridge rectifier to see how it affects the input THD and at last applied a converter with current control and voltage control loops so that to improve the input THD. A step change at Load end is applied and the result is displayed so that to show the response of the system to be stable. All the results are shown below in the paper.