Design and Implementation Of Isolated High Power DC-DC Boost Converter Using DSP

Abstract

A DC-DC converter can be considered as DC equivalent to an AC transformer with variable turns ratio. DC converter is widely used for traction motor control trolley cars, marine hoists, forklift trucks, mine haulers and DC/AC drives and DC voltage regulators. They provide smooth acceleration control, high efficiency and fast dynamic response. Power supplies, which are used extensively in industrial application. The main aim of this project is to meet industrial needs like isolation between source and load, smooth control of power flow, high conversion efficiency, lower distortion in output voltage and current. Different isolated converter topologies such as forward converter, fly back converter, push pull converter, half bridge converter, full bridge converter. The report mainly covers full bridge converter topology. The effects of various control techniques on the transient response of switching power supply have been discussed and compared. The full bridge converter topology is designed and simulated using PSIM6.0 software tool. This report contains full bridge converter design, control of full bridge converter, transformer design, transformer core selection, transformer development, simulation results, experimental results are also discussed. A dc-dc converter of 10 KW capacity for converting 144 V DC voltage available as a battery supply to 600 V DC for feeding battery back up AC drive is presented in this report. The converter uses full bridge inverter - transformer -rectifier scheme to provide galvanic isolation between input and output and uses IGBTs to switch at 6 kHz. The constant voltage (CV) mode control is simulated with conventional control scheme and phase shift control scheme and checked for varying duty cycle and hence varying output voltage. The proposed scheme is illustrated and experimentally verified by prototype module.