Digital Control Of High DC Voltage Converter Based On Cockcroft Walton Voltage Multiplier

Norhidayah, Mamat (2008) Digital Control Of High DC Voltage Converter Based On Cockcroft Walton Voltage Multiplier. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

A new method of controlling high DC voltage based on Cockcroft Walton Voltage Multiplier circuit by using digital controller is presented. The digital controller is developed using Complex Programmable Logic Devices (CPLD). The proposed system utilizes a single-phase AC as an input supply. The power switching devices in the controlled Sridge are mntrolled by the multiple-pulse Pulse Width Modulation (PWM) switching technique so as to minimize the low order harmonic present on the AC side of the converter system. c~cvent;,ond converter circuit also cm p:c&tce the high voltage by cascading many stages of conventional DC supply or use higher step-up transformer for fewer stage DC supplies but it is costly and bulky. This project is producing the high voltage using the PWM technique or Cockcroft-Walton Voltage Multiplier. This method is cheaper and smaller size. The objective of this project is to Use Cockroft-Walton Voltage Multiplier in order to produce a high DC voltage. There is a few methods to control the output of the Cockcroft Walton circuit such as varying the modulation index of the switching pulses, frequency of the input voltage, varying the duty cycle of the switching pulses. The results will demonstrate that with a 1 : 1 transformer ratio, the voltage gain of Cockcroft Walton with four stages can be boost up to 100. The DC output voltage is regulated externally using a modulation index. PWM signal will provides a convenient way to vary the width of PWM and regulate the output of high DC voltage.

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