Digital Control Of High DC Voltage Converter Based On Cockcroft Walton Voltage Multiplier
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 po...
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| Format: | Monograph |
| Published: |
UTeM
2008
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| Online Access: | http://library.utem.edu.my:8000/elmu/index.jsp?module=webopac-d&action=fullDisplayRetriever.jsp&szMaterialNo=0000043601 http://library.utem.edu.my:8000/elmu/index.jsp?module=webopac-d&action=fullDisplayRetriever.jsp&szMaterialNo=0000043601 http://eprints.utem.edu.my/3081/1/Digital_Control_Of_High_DC_Voltage_Converter_Based_On_Cockcroft_Walton_Voltage_Multiplier-_Norhidayah_binti_Mamat_-_24_pages.pdf http://eprints.utem.edu.my/3081/2/Digital_Control_Of_High_DC_Voltage_Converter_Based_On_Cockcroft_Walton_Voltage_Multiplier.pdf |
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| Summary: | 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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