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Switching Pattern Analysis for AC to High DC Voltage Converter

An analysis of the switching pattern for AC to high DC voltage converter is presented. Four different types of Pulse Width Modulation (PWM); Multiple-pulse PWM, Sinusoidal PWM and two Modified PWMs are compared. PSpice simulation software is used to investigate the switching pattern that produce high DC output voltage and less low order harmonics content in the input current supply. From the simulation results obtained, the best switching technique is selected and implemented in the Xilinx Complex Programmable Logic Devices (CPLD) chip and the laboratory model of the converter is developed and tested. To validate the selection, the performance of the constructed prototype unit is investigated and compared with the simulation result.