A Rectifier-fed DC-DC Boost Converter with Improved Voltage Conversion Ratio and Reduced Output Voltage Ripple

Abstract: In this paper, the simulation analysis of a non-isolated diode rectifier-fed DC-DC boost converter with high voltage gain is presented. The proposed two-switch converter is operated in continuous conduction mode (CCM). The suggested converter exhibits improved voltage gain compared to the traditional boost converter and other topologies. The simulation of the proposed two-switch converter with switching frequency of 50 kHz has been carried out in MATLAB/SIMULINK environment. An uncontrolled diode bridge rectifier supplies the rectified DC voltage to the proposed DC-DC converter. The AC input supply to the rectifier is 25 V (rms). This voltage is converted into around 24 V (DC) at the output of the rectifier stage. At the output of the DC-DC converter, a DC voltage of 370 V is obtained for the same duty cycle (k) of 70% for the two switches. The converter is capable to provide wide range of high step-up output voltage with significantly reduced overshoot and settling time for a range of duty cycle (k). However, the converter can produce high value of output voltage at low duty cycle itself. The ripple content in the output voltage is very much reduced with the help of a suitable filter capacitor at the output. Further, low voltage stress is observed on the two active switches.

Keywords: CCM, Duty cycle, MATLAB/SIMULINK, Ripple content, Two-switch DC-DC converter topology, Voltage gain.