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...
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...
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...
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...
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...
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...
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”.
The first structure (AGIR1) implements a series/parallel...
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...
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...
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...
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...
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...
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...
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...
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...
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 20783
Dr. Stephen Bayne
Texas Tech University
Department of Electrical & Computer Engineering Box 43102
Lubbock, TX 79409-3102
The advancement of silicon carbide (SiC) and gallium nitride (GaN) metal oxide...
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...
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...
