Development of fuzzy controller for ZCS quasi-resonant Luo converter

In many pulse width modulated DC/DC converter topologies, the controllable switches are operated in switch mode where they are required to turn the entire load current on and off during each switching cycle. Under these conditions, the switches are subjected to high switching stresses and power losses. Recently there is an increased interest in the use of quasi-resonant type DC/DC converters due to the advantages of high frequency of operation, high efficiency, small size, light weight, reduced Electro Magnetic Interference (EMI) and low component stresses. DC/DC zero current switching (ZCS) quasi-resonant Luo converters find applications in distributed energy systems like solar systems, vertical axis aero-generator and fuel cell power systems. DC/DC ZCS quasi-resonant Luo converters are also employed in a variety of applications including power supplies for personal computers, space-craft power systems, lap-top computers, telecommunication equipments as well as DC motor drives. The present work is on the performance evaluation of DC/DC ZCS quasi-resonant Luo converters. MATLAB software and TMS320LF2407 digital signal processor (DSP) are used to study the dynamic characteristics and analyze the closed loop performances of these converters with resistive load and fuzzy controllers under supply and load disturbances. The simulation and experimental results closely match with each other and highlight the feasibility and validity of the developed control scheme.