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05/06/2018, 13:30Poster Presentation
TAE Technologies field-reversed configuration (FRC) type, C2-W (Norman), fusion experiment is operating since April 2017. The Active Electrodes are the main mechanism of plasma edge active stabilization. They are located in the Inner and Outer Diverters of C2-W (Norman).
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To provide a current to plasma via these Active Electrodes, two 5kV 5kA pulsed Electrode Power Supplies (EPSU) with a deep... -
05/06/2018, 13:30Poster Presentation
Eagle Harbor Technologies, Inc. is developing a series stack of solid-state switches to produce a single high voltage switch that can be operated at over 35 kV for magnetron driving applications. During the Phase I program, EHT developed a 15-kV high voltage switch module with isolated power gate drive that could switch 300 A at switching frequencies up to 500 kHz for 10 ms bursts. Robust...
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05/06/2018, 13:30Poster Presentation
A novel paralled topology of all solid-state Marx generator using metal–oxide–semiconductor- field-effect transistors (MOSFETs) has been developed for high current with steep edges. This kind of Marx generator has a stacked-stage structure from the bottom to the top with low voltage at the bottom and high voltage at the top. Each stage is combined by many modules in a single board, and one of...
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05/06/2018, 13:30Poster Presentation
Pulsed power generation is required by various types of industrial applications, including food and water sterilization, particle acceleration, low-temperature plasma, or Tokamak vertical stabilization, etc. The voltage level of pulsed power generators ranges from a few kV to hundreds of kV. With the past development of semiconductor devices, solid-state pulse generation has been growing due...
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Mr Joshua Gilbrech (Leidos)05/06/2018, 13:30Power Electronics, Power Supplies, Prime Power, Rotating Machines, and Energy ConvertersPoster Presentation
Magnetic switch pulse-sharpening systems rely on the hysteresis (B-H curve) properties of the material and are affected by the residual state of the previous pulse conducted through the ferromagnetic core in rep-rate applications. Prior work has used an external solenoid field (B-field) coil to reset the core material to discrete values of axial magnetic domain bias. Large pulsed current...
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Chunhui Gu (Electric Power Test & Research Institute Guangdong Power Supply Co.)05/06/2018, 13:30Poster Presentation
Abstract: Power transformer is one of the most important electrical equipment in power system and its reliability is very important to power systems. Therefore, the transformer condition monitoring and fault diagnosis have been paid a lot of attention to by the researchers. The mechanical fault diagnosis method based on the vibration signals of transformer has been widely studied because the...
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05/06/2018, 13:30Poster Presentation
Silicon (Si) is the most widely used in power electronic devices. However, due to its limitations regarding blocking voltage and switching frequency, wide band gap (WBG) materials have been under extensive research. Especially, Silicon carbide (SiC) device is expected to replace the Si device in many applications. However, current commercial SiC device ratings still has much room for...
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Mr Tianjun Long (Xi'an Jiaotong University)05/06/2018, 13:30Poster Presentation
In the Traditional series-connected MOSFETs circuit, each of MOSFET requires a separate external drive circuit, and every drive circuit must be isolated from each other magnetically or optically. This results in increased circuit complexity. Furthermore, the differences of drivers in transmission delay will cause overvoltage and overheating on semiconductor devices, which will threaten the...
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05/06/2018, 13:30Poster Presentation
Exploding films have potential applications as fast-opening switches, current interrupters, and ignitors of explosive materials. The exploding film phenomenon is a process in which a high-voltage capacitive discharge is passed through a thin layer of metallized particles on the surface of a dielectric film. Heat generated from the increase in current forces the metallized particles from a...
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05/06/2018, 13:30High Voltage Design, Devices, Testing, and DiagnosticsPoster Presentation
The inductively coupled radiofrequency plasma source of SPIDER and MITICA experiments for the ITER Neutral Beam Test Facility in Padova is designed with highly engineered device called “driver” responsible for the ignition and sustainment of the plasma in the source and delivering 100kW power at 1 MHz. In order to provide high reliability of the source, such a high operating power requires...
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Mr Matthew Kim (Texas Tech University)05/06/2018, 13:30Poster Presentation
As Silicon reaches its theoretical limit in power density capabilities, Gallium Nitride (GaN) High Electron Mobility Transistors (HEMTs) are an ideal option in applications of power electronics due to its wide-bandgap, similar to another proven technology is Silicon Carbide, and high electron mobility due to its special channel. Because of GaN being state of the art technology in power...
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05/06/2018, 13:30Poster Presentation
The LHC Beam Dumping System (LBDS) is a safety critical system ensuring extraction and safe deposition of LHC beams on their respective dump blocks. It consists of 15 extraction and 10 dilution generators per beam and generates up to 1 MA total current at 7 TeV beam energy.
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Both extraction and dilution generators employ similar stacks with 10 series connected GTO like thyristors as the main... -
Prof. Hong-Je Ryoo (Chung-Ang University)05/06/2018, 13:30Poster Presentation
This paper presents an investigation of trigger circuit for xenon flash lamps driver from the view point of breakdown voltage, high-voltage isolation and reliability. A comparative study of pulse trigger and dc trigger circuits is provided, focusing particularly on the circuit structure of each driver for high voltage isolation. Two kinds of trigger circuits for xenon flash lamp driver are...
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Antoine SILVESTRE de FERRON (Laboratoire SIAME)05/06/2018, 13:30Poster Presentation
During the past four years, the SIAME laboratory (University of Pau) and the EFFITECH company have combined their skills to design and construct two high different modulators. The name of this project funded by the French Ministry for Defense is “AGIR” which is the French acronym for “Architecture for rectangular pulse generation”.
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The first structure (AGIR1) implements a series/parallel... -
05/06/2018, 13:30Poster Presentation
High voltage DC (HVDC) power supplies require a discharging circuit at their output terminals to dissipate the energy stored in the output filter capacitors when the unit is turned off. This helps to improve the operator safety while connecting and disconnecting loads to the HVDC power supply. There are varying safety standards covering this aspect with most of them requiring that the output...
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Mr Tianjun Long (Xi'an Jiaotong University)05/06/2018, 13:30Poster Presentation
With the development of energy Internet, the proportion of modular multilevel converter in the system further increases. High-voltage multilevel stepped waves become a typical waveform stressed on the related insulation. In order to study the insulation characteristics of equipment under multilevel stepped wave stress, it is necessary to develop a high-voltage multilevel step-wave voltage...
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05/06/2018, 13:30Poster Presentation
During tests in the frame of commissioning semiconductor based Marx generators short circuit of the load needs to be considered. Hence, a test-circuit comprising an electrolytic load in parallel to a switched inductance has been developed in order to test the over-current protection capabilities of the generator. Thereby, a triggered spark gap switch is used to shorten the output of the Marx...
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05/06/2018, 13:30Poster Presentation
This work reports some experimental results of an isolated LC resonant DC-DC converter to generate high voltage regulated. The converter uses a single stage and it is based on a full bridge structure using MOSFETs as switching devices. The output stage of the DC-DC converter is built using series-connected lower voltage modules. The proposed topology is based on the current-fed push-pull DC-DC...
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Mr Sean Coffey (Sandia National Labs), Dr T. Chris Grabowski (Sandia National Labs)05/06/2018, 13:30Poster Presentation
Traditionally, large-amplitude, fast-rising currents and magnetic fields has been measured with electro-magnetic probes such as Rogowski coils or B-dot probes. Such probes are observed to work satisfactorily for many experimental configurations but the probe to digitizer signal is affected by cabling and cabling elements. Measurements must frequently be made in the presence of significant...
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Kenneth Struve (Sandia National Laboratories)05/06/2018, 13:30High Voltage Design, Devices, Testing, and DiagnosticsPoster Presentation
In our continued effort to reduce the size, weight, and power (SWAP) of high density capacitors we have purchased and tested two experimental capacitor designs from two different vendors. These are critical components for energy storage for a variety of applications. These are paper/foil capacitors with high discharge current capability which are used in Marx bank configurations, and...
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05/06/2018, 13:30Poster Presentation
The High Energy Storage Ring (HESR) for Antiprotons is going to be built at FAIR in Darmstadt on the extended GSI campus.
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Charged particle (including protons and antiprotons) of 13 Tm magnetic rigidity will be injected into this synchrotron and storage ring. The injection system of the HESR ring is based on 4 UHV 360 mm long ferrite kickers, each kicker having to generate à 25 T.mm integral... -
Mr Sven Pütz (GSI Helmholtz Centre for Heavy Ion Research)05/06/2018, 13:30Poster Presentation
The FAIR accelerator chain comprises a 68 MeV proton injector (pLINAC). Seven identical high power RF systems can supply the RFQ, CCH and CH accelerating structures with up to 2.5 MW. The klystrons require a cathode voltage pulse of -115 kV, 54 A with a flat-top droop of less than 1% over 360 µs. A Klystron modulator has been developed at GSI to meet this demand and two prototype systems are...
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05/06/2018, 13:30Poster Presentation
Spark gap closing switches feature superior switching characteristics in switching speed, current handling and voltage hold-off capability. Unfortunately these switches suffer from electrode erosion and the switching medium has to recover after each pulse, limiting the life-time and repetition rate of the switch. The recovery can be improved by purging the gap to remove heated and ionized gas...
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05/06/2018, 13:30Poster Presentation
Low ON-resistance high voltage analog switch ICs are mainly used for ultra sound imaging system or PCB bare board E-checker system. Especially, PCB E-checker test adjacent PADs open or short state under high voltage over 200V aging condition using Kelvin 4 terminal measurement. To operate switch over 200V, gate oxide thickness should be thicken to guarantee breakdown voltage between gate and...
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05/06/2018, 13:30Poster Presentation
Dielectric elastomer actuators (DEA) are designed to actuate under high voltage stress. The voltage required to actuate is typically at the limit of the compliant material, in this case 3M VHB 4910. As a result, repeated electrical stressing of the material will lead to the occurrence of partial discharges (PD) at the voltage required for actuation. Previous work has shown that repeated...
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05/06/2018, 13:30Poster Presentation
Neutral beam injection (NBI) is important in fusion science experiments for plasma heating, current drive and diagnostics. Currently, there limited vendors for these systems, and there are no vendors in the United States, which is a potential challenge for the development of private fusion for defense applications. Eagle Harbor Technologies (EHT), Inc. has completed a Phase I program to...
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Mr Joshua Gilbrech (Leidos)05/06/2018, 13:30Power Electronics, Power Supplies, Prime Power, Rotating Machines, and Energy ConvertersPoster Presentation
Evolutionary designs in the packaging of SiC high frequency MOSFETS by CREE® permit the design of compact DC-DCHV power supplies operating at frequencies >100 kHz. A system that uses a DC input of 300 volts from a NiMH rechargeable battery has been built. The battery chemistry is insufficient to source applicable ampacity to efficiently convert the power to elevated kilovolt (kV) potentials...
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tonghai ding (Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology), Dr Yun Xu (Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology), Hongfa Ding (Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology)05/06/2018, 13:30Poster Presentation
In Wuhan National High Magnetic Field Center (WHMFC), a new DC breaker based on the pulsed electromagnetic forming (EMF) technology is developed. The breaker is intended for current interruption in the Battery power supply for protecting the long pulsed magnet. The breaker consists of pulsed magnet (EMF coil), aluminum tube (the main contact of DC breaker) and supporters. The aluminum tube is...
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05/06/2018, 13:30Poster Presentation
Solid state components have revolutionized high voltage pulsed power systems. The typical device voltage for a solid state device (1-3 kV) is generally much less than the output voltage for a high voltage application. In transformer systems, in particular the impedance varies as the square of the step-up so that the required impedance of the primary system is N^2 lower than the output...
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Claus Strowitzki (MLase AG)05/06/2018, 13:30Poster Presentation
For simulation of pulse compression networks the saturation behavior of the pulse compression cores are an important parameter. The data from the supplier does not cover the region we need for the calculation. The challenge is to measure the relative permeability of the material from 1 A/m to 10 kA/m. The approach is threefold. In the range of 1 to 1000 A/m the hysteresis loop is used. In the...
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Chris Grabowski (Sandia National Laboratories)05/06/2018, 13:30Poster Presentation
The Hermes III accelerator is a 20-MV linear induction accelerator that has been in operation at Sandia National Laboratories since the late 1980’s. Energy is initially stored in the accelerator in ten Marx banks that are discharged into twenty intermediate store capacitors. These intermediate store capacitors are then switched with SF6-insulated high voltage rim-fire switches into eighty...
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Mr Richard Thomas (Army Research Laboratory)05/06/2018, 13:30Poster Presentation
Solid State Power Emulator Improvements for Power Device Evaluation
Richard Thomas
Army Research Laboratory RDRL-SED-P
Power Conditioning Branch
2800 Powder Mill Rd
Adelphi, MD 20783Dr. Stephen Bayne
Texas Tech University
Department of Electrical & Computer Engineering Box 43102
Lubbock, TX 79409-3102The advancement of silicon carbide (SiC) and gallium nitride (GaN) metal oxide...
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Mr Cao Zhan (State Key Lab of Electrical Insulation and Power Equipment, Xi’an Jiaotong University)05/06/2018, 13:30Poster Presentation
Transformer winding vibration frequency response characteristics is the direct reflection of winding mechanical condition. Studying transformer winding vibration frequency response characteristics is very meaningful for winding modal analysis and can be utilized for winding mechanical fault diagnosis. This paper use a single winding to perform frequency response experimentation which mainly...
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05/06/2018, 13:30Poster Presentation
Transformer vibration is closely related to winding and core condition. Vibration-based transformer condition monitoring and diagnosis technique has been widely used recently, and core vibration occupies a large proportion in the total vibration of operating power transformer. Besides the fluctuant operating voltage, temperature of core silicon steel is considered as the major influential...
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Dr Stephen Bayne (Texas Tech University)05/06/2018, 13:30Poster Presentation
As an increasing number of Silicon Carbide (SiC) devices become commercially available, and as Silicon devices have reached their theoretical power density limits, SiC devices are being utilized in an increasing number of power electronics applications. It is necessary to conduct further reliability testing and analysis on SiC devices, to encourage further adoption of these devices. One...
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05/06/2018, 13:30Poster Presentation
Larger entrance capacitance of ultrahigh-voltage transformers makes it more difficult to generate standard lightning impulses (SLI) in the lightning impulse withstand voltage test (LIWVT), especially for the front time.In order to analyze the feasibility of substituting test impulses with longer front time for SLI in LIWVT, this paper experimentally studied the voltage distribution...
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05/06/2018, 13:30Poster Presentation
One of the intrinsic properties of HV devices is that voltage distribution along their physical structures at transients is largely governed by parasitics. By transients, we rigorously mean a state when dv/dt is not zero, which includes also periodic processes. Examples range from garlands of insulators to HV dividers and their components to machine and transformer windings.
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