Input power factor correction in a single phase AC-DC circuit using parallel boost converter

摘要

AC-DC converter is a part of any power supply used in the any electronic equipment’s. Power electronic equipment’s are being used in injecting low order harmonics, power conversion. Due to these harmonics, the total harmonic distortion is high and input power factor of this system is poor. PFC schemes are implemented in order to get unity power factor and low input current harmonics and distortion in the line currents. With the low power factor, increase in the neutral currents in 3-phase system, transformers and induction motors heat increases in them and hence, there is a need to continuous improvement of the PF and reduction of the input current harmonics is necessary. The main aim of this thesis is to develop a circuit for the PFC using an active filter by using two boost-converters connected in parallel combination. This will be based on optimized power sharing scheme between them to improve the input current drawn by the load and reducing switching losses. In this project first we done the simulations by using basic circuits without using PFC methods and analysis of the current, voltage waveforms after this, included new components and observed their after effects on input current and input voltage waveforms were observed. The main aim of this project is to improving the input current waveform.