Design, Analysis and Implementation of a Synchronous Buck Converter

Abstract

DC-DC converters concerns very important role in the field of industries or daily life applications. This thesis presents design, analysis, and implementation of a DC-DC synchronous buck converter. The DC/DC synchronous buck converter is a bidirectional converter. Here, gate pulses of two switches are complimentary to each other. However, during switching of the MOSFET, there is always a problem of short-circuiting of source if both the MOSFETs turns ON and OFF at the same time. To eliminate this problem, a blanking circuit has been implemented. The design of synchronous buck converter has been done and its operation in two different modes has been analyzed mathematically. By using MOSFET switch in synchronous buck converter, the diode conduction losses in Buck converter can be reduced, thus improving the efficiency of the converter. While the most important design aspect of DC-DC converters is efficiency. Above work has been validated using MATLAB/Simulink environment. The hardware prototype of a 300 W, 20kHz synchronous buck converter is developed. The synchronous buck converter is quite efficient than normal buck converter. Synchronous buck converter has high operating efficiency, low cost, and simple in construction.