High Efficiency DC-DC Converter with two Input Power Sources using Fuzzy Logic Controller

Abstract — The aim of this study is to develop a high efficiency converter with two input power sources for a distributed power generation mechanism. The proposed converter can boost the varied voltages of different power sources in the sense of hybrid power supply to a stable power output dc voltage for the load demand. An auxiliary circuit in the proposed converter is employed for achieving turn-On zero-voltage switching (ZVS) of all the switches. According to various situations, the operation states of the proposed converter can be divided into two states including a single power supply and a dual power supply. In the dual power supply state, the input circuits connected in series together with the designed pulse width modulation can greatly reduced the conduction losses of the switches. An effective improvement in efficiency can be achieved by using a closed loop “Fuzzy Logic Controller”(FLC) in the proposed topology. Index terms- DC-DCconverter,hybridpowersupply,high-efficiencypowerconversion,zero-voltage switching(ZVS). I