Designing dc-dc converters to generate high voltage pulses

Number of pages: 114 File Format: word File Code: 32266
Year: 2013 University Degree: Master's degree Category: Electrical Engineering
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    Thesis of the Master's course in the field of power electricity

    Abstract

    Pulse power is the accumulation of energy after a relatively long period of time and the release of energy very quickly. This process is to increase the instantaneous power of the system. The characteristic of this pulse includes the voltage level and rise time based on the load requirements. Improvement of efficiency and reliability in pulsed power sources due to its application in plasma is fundamentally related to the characteristics of pulsed power systems. Recently, due to the multiple use of pulsed power sources in industrial and nuclear fields, a lot of research and investigation has been done in the field of optimal use of pulsed power technology in plasma. But the thing that needs to be investigated in this regard is that among the various arrangements available for power pulse generators, which one has more efficiency in these applications and is more suitable for producing the desired power pulse waveforms. In this regard, in the first chapter of this project, firstly, the general information related to pulsed power systems has been stated and brief explanations related to the applications of these systems in various industries have been mentioned. In the second chapter, the various arrangements available for pulsed power systems have been examined according to the type of pulse waveform they generate. In the third chapter, there are two valid articles on the production of high pulse power by creating a current source and a voltage source. These structures are presented based on the positive boost circuit, which has led to very favorable results. And this topology, due to the problems created in the circuit, including the increase in the inductor current at high powers and the high charging time of the capacitors, it is inevitable to improve the aforementioned circuit. In the fourth chapter, by stating the modified topology and checking its performance using the material software, the performance results of the mentioned system have been investigated. The results of this research as well as suggestions for continuing research activities are presented in the fifth chapter.

    Key words: plasma, power pulse, material software, positive book boost

    Introduction

    The increasing use of electric power pulses in various fields such as nuclear and military accelerators, liquid purification, shaping and the hardening of metals, the feeding of lasers and It has led to the development of special power sources called pulse power sources. The general concept of power pulse is actually energy that is released as a shock or in other words momentarily. These types of sources, which are used in pulsed power systems, are responsible for producing high voltage pulses in very short time intervals (nanoseconds, microseconds and milliseconds). took He was a hydrodynamic scientist who was suffering due to his inability to purchase a suitable x-ray radiography source to image the hydrodynamic phenomenon he was interested in. As a result, he established a new generation of radiographic sources based on low-impedance line-coupled high-pressure Marx generators and cold-cathode single-stage accelerator intervals [3], which marked the beginning of the birth of advanced pulsed power systems. The science and technology of pulse power spread rapidly in the United States, the former Soviet Union and present Russia, Europe and Asia. The power pulse is a technology with high efficiency and advantage that has been developed for some applications that require a very large power pulse for a relatively short period. Common types of charges include charged particle emitting diodes, explosive plasmas, and other primary applications related to the defense industry. However, nowadays loads can be any of the available environmental applications such as biological samples, drinking water feeding urban areas or gases released from combustion processes. In short, pulse power has not only been developed to play an important role in the defense industry, but has become an important and valuable technology in environmental fields [1]. The largest pulsed power systems are those used in the laboratory to study high energy density plasma physics and its equations of state.They typically produce electrical power beyond tens of terawatts. Examples of this class of generators are the Z accelerator at Sandia National Laboratories and the Atlas machine at Las Alames National Laboratory (now located at the Nevada Test Site). These large systems are designed to produce a single high power pulse and then require some servicing before producing the next pulse.

  • Contents & References of Designing dc-dc converters to generate high voltage pulses

    List:

    Chapter One: Review of pulsed power systems and their applications

    Introduction

    1-1 History of pulsed power systems

    1-2 Working principles

    1-3 Components of pulsed power systems

    1-3-1 Energy storage system

    1-3-2 Pulse forming systems

    1-3-3 switches

    1-3-3-1 switches with liquid connection

    1-3-3-2 spark gap switches

    1-3-3-3 resistance switch

    1-3-3-4 semiconductor switches

    1-4 application of pulsed power systems

    1-4-1 application in the field of microorganisms 1-4-2 High pressure electrical pulses in food processes 1-4-3 Applications in the field of materials manufacturing 1-4-3-1 Electroplating by pulses 1-4-3-2 Preparation of wood by laser pulses 1-4-4 Crushing of rocks by pulses 1-4-5 Applications in the field of chemicals and materials Petroleum

    1-4-5-1 Removal of emulsions in crude oil by pulsed high pressure fields

    1-4-6 Water and wastewater treatment

    Chapter two: review of types of power pulses and their generator circuits

    Introduction

    2-1 Power pulse shaping network

    2-2 Power pulse compressor

    2-2-1 Performance of series magnetic compressors

    2-2-2 Parallel magnetic pulse compressors

    2-3 Marx generator

    2-4 Resonant pulse generator

    2-5 Resonant doubler pulse generator

    2-6 Voltage multiplier circuit

    2-6-1 Positive voltage multiplier

    Chapter three: Converter Positive boost book for generating high pulse voltage

    Introduction

    3-1 Basic concept of pulsed power

    3-2 Topology arrangement and analysis

    3-2-1 General arrangement

    3-2-2 Turn on modes

    3-2-2-1 First mode: Inductor charging (on: Ss and on: S1 and on: S2)

    3-2-2-2 Second state: Inductor current circulation (Off: Ss: On: S1, On: S2)

    3-2-2-3 Third state: Charge: Capacitor (On: Ss: On: S1, On: S2)

    3-2-2-4 Fourth state: Separate charging of capacitors (Off: S2 and Off: S1 and Off: Ss)

    3-3 Analysis Circuit

    3-3-1 Control strategies

    3-3-2 Current source control

    3-3-3 Voltage source control

    3-3-4 Load sample control

    3-4 Simulated results and analysis

    3-4-1 Simultaneous switching

    3-4-2 Separate switching

    Chapter four: Introducing the presented topology and Simulation results

    4-1 Topology introduction

    4-2 Topology arrangement and analysis

    4-2-1 first stage: pulse power converter storage (self charge)

    4-2-2 second stage: pulse power converter energy transfer (capacitor charge)

    4-2-3 in the third stage: pulse power generation (plasma failure)

    4-3 mechanisms Control

    4-3-1 Current source control

    4-3-2 Voltage source control

    4-3-3 Load sample control

    4-4 Current and voltage analysis applied to semiconductor devices

    4-4-1 Inductor charging (current source)

    4-4-2 Capacitor charging (voltage source)

    4-4-3 Failure Plasma

    4-5 Results and simulation

    4-5-1 Currents stored in inductors

    4-5-2 Voltage stored in capacitors

    4-5-3 Voltage and current applied to the load

    Chapter five: Conclusion and suggestions

    5-1 Conclusion

    5-2 Suggestions

    Sources

     

    Source:

     

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Designing dc-dc converters to generate high voltage pulses