Performance Analysis of DC-DC Converter Zero Current Switching Quasi Resonant Buck Converter Using Fuzzy Controller

Need for DC to DC converter arises on account of the fact that in most situations the source of available power and conditions under which the load demands are incompatible with each other. The quest to develop smaller, lighter and more efficient power converters hassled to design converter circuits capable of operating at higher frequencies and to the development of improved components and innovative packaging. The increasing of frequency is problematic because of direct dependence of switching loss on frequency. However, the use of soft switching technique, ZCS, is an attempt to substantially reduce switching loss and hence attain higher efficiency at increased frequency. DC to DC QUASI RESONANT CONVERTER is a new, high performance power converter and is operated with the technique of soft switching as it is required in many industrial and aerospace applications. It implements zero power consumption operation during switching ON and OFF periods and hence largely reduces the cost and power losses in the converter in order to increase the power density and power transfer efficiency. The resonant tank of this converter consists of only two elements and is operated at the mono resonant frequency in the order of kHz. The converter utilizes only half cycle of the resonant period and is analyzed in steady state. State space averaging technique is then implemented to develop the transfer function and a novel method namely fuzzy logic is used to improve the performance of the system as it has been developed based on the expert knowledge and work on rule base structure.