Reduced Capacitance of Single Phase Four-Switch Rectifier with Fuzzy Controller

Abstract

In this project we are implementing a single-phase four-switch rectifier with considerably reduced capacitance. In this paper the rectifier consists of one conventional rectification leg and one neutral leg linked with two capacitors that split the DC bus. According to the ripple energy inside the rectifier is diverted into the lower split capacitor in order that the voltage throughout the upper split capacitor, designed to be the DC output voltage, has very small ripples. Here we are utilizing the fuzzy logic controller because of its better performance when comparing to the other controller. Such as, the fuzzy controller is the most suitable for the human decision-making mechanism, providing the operation of an electronic system with decisions of experts.  There the voltage throughout the lower capacitor is designed to have big ripples on purpose so that the entire capacitance wished is considerably reduced and especially dependable film capacitors, as opposed to electrolytic capacitors, can be utilized. The ripple energy in the rectifier is diverted into the lower split capacitor so that the voltage across the upper split capacitor, designed to be the DC output voltage, has very small ripples. The voltage across the lower capacitor is designed to have large ripples on purpose so that the total capacitance needed is significantly reduced and highly reliable film capacitors, instead of electrolytic capacitors, can be used. By using the simulation results we can analyze the performance of the proposed strategy.