Design of DC high voltage low current power supply using DC-DC converter and cockcroft-walton (C-W) voltage multiplier

Abstract

A high dc voltage with low power consumption is used in cryogenic cooling for the purpose of cooling system. In order to accomplish the high dc voltage, numerous efforts are carried out to determine a new method of generating high voltage where the value is higher than the supply voltage. In addition, high voltage dc with low load current particularly affects our society in the application industry used by computers and other electronic devices. Among its applications are plasma generation, dc backs up system, Scanning Electron Microscope (SEM), Photomultiplier Tube (PMT), capacitive microphone, and ultrasonic transducer cooling with less electrical power are required. Besides, a high voltage dc power supply is a critical element therefore must perform consistently. Basically, a high voltage is achieved by implementing a transformer. However, this project proposes building a high dc voltage based on the switching regulator and Cockcroft-Walton (C-W) voltage multiplier without using a transformer. The work aims to achieve a high output dc voltage and low dc current. In the cascaded voltage multiplier circuit, the transformer is the bulkiest part of the high voltage dc power supply unit and most of the losses are associated with it in the previous design. With the existence of a transformer in a high voltage design, it is difficult to integrate the design on a chip. Therefore, the transformer is not used in a construction of 1600 V high dc voltage and low current in this work thus, making it feasible to integrate the high voltage supply with other associated circuits on a single chip. A prototype of high dc voltage power supply is constructed based on a design, simulation and implementation of hardware in a laboratory. In this project firstly a simulation has been launched in which the required parameter is established, and results are gathered through an observation. Then, for an experimental purpose hardware is implemented in a high voltage laboratory. The proposed design consists of Pulse Width Modulation (PWM) controller circuit, voltage multiplier, and feedback signal. A single unit of 5 V input triggers LT1618 controller circuit to generate 30 V which then produces 100 V from LT8331 output that is connected to diode-capacitor multiplier circuit to achieve the final 1600 V with 200 kHz input signal frequency. A negative feedback signal is required to stabilize an output voltage.