Buck Converter Current Limiting Charger

Abstract

This project revises of power electronic conversion techniques for switch mode power converter for buck topology. Traditionally, analog control technologies have been employed to regulate the output voltage of DC-DC converters. The utilization of digital control techniques for this regulation function is currently under consider- ation. Critical issues in a digital control implementation include analog-to-digital conversion range, resolution and delay, calculation time, and numerical precision. Modern vehicle designs are incorporating an increasing level of electrical loads. The many loads has led to unpractical cable sizes and increased losses due to the large currents required. To solve this power crisis for the future, DC/DC converter is required to step-down the input voltage 74volt -200volt to output voltage 48volt-72volt. Microcontroller based Current mode control is a new control scheme for shaping the input current of the buck converter. The converter is to have 2.4kW to 3.6kW power rating with an output current handling capability of 50A. And have an overall target e ciency more than 90%. The topic of this dissertation is to design and build a DSP based current limit- ing charger. These goals are obtained through the use of switch mode technology. This approach aims at improved e ciency, lower cost and increased exibility, thus making it suitable for this application.