Fuzzy Logic Based Closed loop control scheme for Voltage doublers based DC – DC Converter

Abstract

The paper proposes a high step up boost converterwith coupled-inductor and voltage-doubler circuits is proposed. The proposed converter has used a coupled inductor with switched capacitors. The capacitors were made to get charged in parallel and were made to get discharged in series by the configuration to achieve high step up voltage gain. And the voltage across the load is maintained constant by using a closed loop control.Switch voltage stress and the circulating current are reduced by a clamp circuit which is composed of a diode followed by a capacitor. Thus the efficiency of the converter is improved. The operating principle and the steady state analysis are discussed in detail. A Fuzzy logic controller is designed such that it eliminates the Voltage Drift problemComputer simulation by MATLAB/ SIMULINK hasbeen used to support the developed concept.

Keywords: Coupled Inductor; FLC; Switched
Capacitor circuit; Switched Capacitor; PI Controller; Fuzzy Logic Controller