The continuously increasing demand for electric power and the economic access to remote renewable energy sources such as off-shore wind power or solar thermal generation in deserts have revived the interest in high-voltage direct current HVDC multiterminal systems networks . A lot of work was done in this area, especially in the 1980s, but only two three-terminal systems were realized. Since then, HVDC technology has advanced considerably and, despite numerous technical challenges, the...
Topics: Electrical Engineering, Distributed generation, Renewable energy sources, Fuel cell systems,...
This paper describes a dynamic model of a SOFC fuel cell, which can be used in transient stability studies. The model is applied to a distributed utility grid that uses a fuel cell and a gas turbine as distributed generators DGs . Transient stability of the system is investigated for different DGs power outputs using a software developed based on the commercial Power System Tool Box and SIMULINK in MATLAB. A method for interfacing the fuel cell to the grid is presented. Transient stability is...
Topics: Electrical Engineering, Distributed generation, Renewable energy sources, Fuel cell systems,...
Renewable energy generation is quickly rising in the power sector industry and extensively used for two groups grid connected and standalone system. This paper gives the insights about fuel cell process and application of many power electronics systems. The fuel cell voltage drops bit by bit with increase in current because of losses related with fuel cell. It is difficult to control large rated fuel cell based power system without regulating tool. The issue associated with fuel based...
Topics: Electrical Engineering, Distributed generation, Renewable energy sources, Fuel cell systems,...
Increasing energy needs push industry to build more sustainable and efficient systems. One of the methods to achieve energy efficiency is to feed wasted energy generated by a system itself during operation back to the system. Vibrational energy is one of the most common ambient energy forms in mechanical systems and can be converted into electrical energy with the implementation of piezoelectric energy harvesters. What makes this possible is the piezoelectric effect that some crystals and...
Topics: MEMS, Waste Energy Harvesting, Piezoelectric, Power Conditioning, Piezoelectric Energy Harvester
THE SHIVA STAR capacitor bank, a 120 KV parallel bank storing 9.5 MJ with a short circuit current of almost 90 MA, at the AFWL is the world's highest energy, fast capacitor bank. The approximately 3 microsecond short circuit current risetime is shortened by an inductive store/opening switch power conditioning system in which a total inductance of about 10 nH is charged with 35 MA currents. Electrically exploded conductor (fuse) opening switches are employed to interrupt the current in a few...
Topics: DTIC Archive, AIR FORCE WEAPONS LAB KIRTLAND AFB NM, *CAPACITORS, *HIGH ENERGY, *SHORT CIRCUITS,...
The recent demonstrations of reliable fuse/opening switch operation at high currents and short time scales suggest that inductive store/opening switch (IS/OS) circuits with their inherent advantages of small size and light weight may be appropriate for a wide variety of applications. Among these is the possibility of developing a power system for high current, high voltage diodes. While conventional IS/OS circuits can be employed, the MV voltages required make the fuse excessively long,...
Topics: DTIC Archive, AIR FORCE WEAPONS LAB KIRTLAND AFB NM, *DIODES, *ENERGY STORAGE, *SWITCHES,...
This paper describes the application of subsystem summary algorithms for self-contained power system configuration trade-off studies, and presents the results of a recently completed study. The development of summary weight algorithms for rocket turbines and rotating electrical generators is described. These new algorithms are combined with previously developed power conditioning subsystem algorithms in a computer program to automatically study various system configurations. A flow chart of the...
Topics: DTIC Archive, AIR FORCE AERO PROPULSION LAB WRIGHT-PATTERSON AFB OH, *ALGORITHMS, *ELECTRIC...
High energy lasers for Army tactical weapons systems requires major advances in pulse power technology to meet the objective of mounting the weapon system on a mobile platform. The power conditioning pulser is one of the largest sub-systems. The Electronic Technology and Devices Laboratory (ET&DL), ERADCOM is actively involved in developing components and pulser sub-systems to meet that objective. The unique power facility at ET&DL has been utilized on a cooperative basis with industry...
Topics: DTIC Archive, ARMY ELECTRONICS TECHNOLOGY AND DEVICES LAB FORT MONMOUTH NJ, *HIGH ENERGY LASERS,...
For several years, the Laser Program at LLNL has been designing and building a variety of specialized compact laser systems. They offer extremely high energy densities for their size and are primarily used in medical and military applications where a high premium is placed on both reliability and compactness. These systems are based upon a 2 cm-x-2 cm liquid cooled wafer that supports laser diode bars mounted along one edge. Depending upon the application, the laser diodes are fabricated to...
Topics: DTIC Archive, LAWRENCE LIVERMORE NATIONAL LAB CA, *DIODE LASERS, *POWER CONDITIONING, ELECTRIC...
Designing and developing the 1.7 to 2.1-MJ Power Conditioning System (PCS) that powers the flashlamps for the National Ignition Facility (NIF), currently being constructed at Lawrence Livermore National Labs (LLNL), is one of several responsibilities assumed by Sandia National Labs (SNL) in support of the NIF Project. The test facility that has evolved over the last three years to satisfy the project requirements is called FANTM. It was built at SNL and has operated for about 17,000 shots to...
Topics: DTIC Archive, SANDIA NATIONAL LABS ALBUQUERQUE NM, *LASERS, *POWER CONDITIONING, CAPACITORS,...
The laser glass for the National Ignition Facility (NIF) Main Amplifier system is pumped by a system of 192 pulsed power/flash lamp assemblies. Each of these 192 assemblies consists of a 1.6 MJ (nominal) capacitor bank working with a Pre-Ionization/Lamp Check (PILC) pulser to drive an array of 40 flash lamps. This paper describes the predicted performance of these Power Conditioning System (PCS) modules in concert with flashlamp assemblies in NIF. Each flashlamp assembly consists of 20 parallel...
Topics: DTIC Archive, MAXWELL PHYSICS INTERNATIONAL SAN LEANDRO CA, *PULSE GENERATORS, AMPLIFIERS,...
Pressing needs in several contemporary power, military, and scientific areas have put severe requirements on power conditioning components. In an effort to advance the state of the art, component selection and development tests were collected into a major proposal in 1978-79 at Los Alamos National Laboratory by three interested divisions. One significant portion of that proposal created the 300-kW Capacitor Test Facility (CTF). This paper is the first report of the facility operation and...
Topics: DTIC Archive, LOS ALAMOS NATIONAL LAB NM, *CAPACITORS, *TEST FACILITIES, MODELS, MONITORING,...
This paper describes a set of analyses and tests performed to evaluate approaches to provide a safe and robust grounding approach for the main Power Conditioning System (PCS) in the National Ignition Facility (NIF) facility presently under construction at the Lawrence Livermore National Laboratory (LLNL). The Power Conditioning System consists of up to 192 capacitor bank modules, each storing 2.2 MJ and capable of producing a peak current over 500 kA. The grounding system must minimize touch...
Topics: DTIC Archive, LAWRENCE LIVERMORE NATIONAL LAB CA, *CAPACITORS, *FLASH LAMPS, CABLES, CONSTRUCTION,...
A fully integrated test facility for the National Ignition Facility (NIF) Power Conditioning System (PCS) was completed in August of 2000 at LLNL. The system consists of the computer control and data acquisition subsystem, a 24kV 2.2-MJ Main Energy Storage Module (MESM), Twenty 180ft lengths of high voltage transmission cable, and a standard NIF flashlamp load (the Frame Assembly Unit or FAU). The MESM can contain up to 24 (20 nominal) 300uF energy storage capacitors. Stainless steel...
Topics: DTIC Archive, LAWRENCE LIVERMORE NATIONAL LAB CA, *CAPACITORS, *ENERGY STORAGE, ASSEMBLY, BALLAST,...
A pulsed power generator, Pawn, has been assembled at the Naval Research Laboratory. It employees inductive energy storage and opening switch power conditioning techniques with high energy density capacitors as the primary energy store. The energy stored in the capacitor bank is transferred to a vacuum inductor in approximately 15 (mu)s. Wire fuses provide the first stage of pulse compression. Further power conditioning is obtained with a plasma erosion opening switch.
Topics: DTIC Archive, NAVAL RESEARCH LAB WASHINGTON DC PLASMA PHYSICS DIV, *PLASMA OPENING SWITCHES, *PULSE...
Pulsed power conditioning elements between the energy-storing capacitor banks and the radiation loads have been the major cost driver for large simulators [I]. The cost is driven by the pulsed power requirements needed to provide the necessary spectral and temporal characteristics of the radiation output for Nuclear Weapons Effects Testing (NWET), as well as for assuring efficient production of the radiation. During the past forty years, the Defense Threat Reduction Agency (DTRA) has developed...
Topics: DTIC Archive, DEFENSE THREAT REDUCTION AGENCY ALEXANDRIA VA, *CAPACITORS, *ENERGY STORAGE, *NUCLEAR...
This paper analyzes the use of GaAs photoconductive switches and a 2 m radius. radial transmission line section to generate acceleration gradients of up to 50 MV/m for nanosecond duration. 4 kA beam current pulses. The proposed acceleration system is much simpler and easier to precisely synchronize than the annular electron beam wake field accelerator designs proposed elsewhere. The design of an accelerator module with annular Blumlein line pulse generator. GaAs switches and associated optical...
Topics: DTIC Archive, TEXAS UNIV AT ARLINGTON, *PHOTOCONDUCTIVITY, *SWITCHES, *TRANSMISSION LINES, GALLIUM...
Today the solid-state transistor or thyristor switch satisfies the majority of terrestrial power conditioning requirements replacing the vacuum or gaseous switches of yesterday. The need for power conditioning on extra-terrestrial platforms adds another dimension to switch selection. The switch must be able to operate in the near-vacuum of space, under high but variable radiation levels and be compatible with the thermal management system of the space vehicle. The choice of the type of switch...
Topics: DTIC Archive, ARMY LAB COMMAND FORT MONMOUTH NJ ELECTRONICS TECHNOLOGY AND DEVICES LAB, *SPACE...
The Experimental Test Accelerator II is a high-average-power, high-repetition- rate linear induction accelerator at Lawrence Livermore National Laboratory. Magnetic pulse compressors are used in the power conditioning chains that produce pulses used to accelerate the electron beam. Stable operation of each power-conditioning chain is essential to overall accelerator performance. Variations in voltage or timing (jitter) of pulses driving the induction cells can cause unacceptable variations in...
Topics: DTIC Archive, LAWRENCE LIVERMORE NATIONAL LAB CA, *LINEAR ACCELERATORS, *PULSE COMPRESSION, DIRECT...
The electron beam gun system consists of a 5 x 25 cm aperture hot cathode gun and a thyratron switched line type high voltage pulse modulator. The gun is cathode pulsed with an operating range of 10 to 40 microseconds at a maximum voltage of 220 kV and maximum peak current of 20 amps. The equipment may be operated at a steady prf up to 150 pps for 15 seconds or in a burst mode of a few pulses each equivalent to the steady state rating. The pulse to pulse voltage stability is achieved at the...
Topics: DTIC Archive, AIR FORCE WEAPONS LAB KIRTLAND AFB NM, *CATHODES, *ELECTRON BEAMS, *ELECTRON GUNS,...
There exists an acute need for a solid state fault interrupter capable of operating at high voltages and/or high currents, for such applications as command chargers, electromagnetic launchers and other high power conditioning applications. The gate turn-off thyristor (GTO) is suited for this task. This requires series connection of several devices and their support systems (electronic and thermal). Reliable operation depends on devising a control algorithm that will cause the individual GTO's...
Topics: DTIC Archive, ARMY ELECTRONICS TECHNOLOGY AND DEVICES LAB FORT MONMOUTH NJ, *INTERRUPTERS, *SOLID...
The Los Alamos National Laboratory has applied the explosive magnetic flux compression generator (FCG) technology to the high-energy foil-implosion project, Trailmaster, to reach energy levels unattainable by other methods under current budget constraints. A required component for FCG systems is a power-conditioning stage that matches the slow risetime of the energy source with the fast-risetime requirements of the foil implosion load. Currently, the Trailmaster concept is based on a two-step...
Topics: DTIC Archive, LOS ALAMOS NATIONAL LAB NM, *FUSES(ELECTRICAL), *PLASMAS(PHYSICS), COMPRESSION,...
The Nova laser system is designed to produce critical data in the nation's inertial confinement fusion effort. It is the world's largest peak power laser and presents various unique pulse power problems. In paper, pulse power systems for this laser are described, the evolutionary points from prior systems are pointed out, and the current status of the hardware is given.
Topics: DTIC Archive, LAWRENCE LIVERMORE NATIONAL LAB CA, *CONFINEMENT(NUCLEAR REACTORS), *POWER SUPPLIES,...
An 8-J/pulse magnetic pulse compressor has been built to demonstrate a power conditioning technique whereby battery power is converted into a train of 5-Its pulses at a maximum pulse repetition frequency of 11 kHz. The machine employs inverter-grade thyristors that switch with less than 120-ps pulse-to-pulse jitter. The network uses a phased-triggering scheme to obtain an output voltage regulation of + or - 0.002%. Magnetic core reset is achieved by using a reflected portion of the output pulse...
Topics: DTIC Archive, GENERAL ATOMICS SAN DIEGO CA, *LASERS, *PULSE COMPRESSION, *SOLID STATE ELECTRONICS,...
The application of pulsed power technology to advanced mission scenarios increasingly involves achieving higher peak power and energy while shrinking the deployment package. The inherent high energy density of explosives make them an obvious candidate for applications requiring extremely compact, single shot pulsed power drivers. However, explosive flux compression generators tend to be rather slow, low impedance, high current devices, while the loads of interest typically present a relatively...
Topics: DTIC Archive, PHILLIPS LAB KIRTLAND AFB NM, *ENERGY DENSITY, *EXPLOSIVES, *GENERATORS, *HIGH...
A Pulsed Power Lecture Series is being conducted by Texas Tech University for the U.S. Air Force. Modular instructional material for use in this lecture series is being developed. Each module is a self-consistent discussion of some aspect of pulsed power technology. The contents range from the very basic (e.g. basic EM field theory) to advanced, modern topics, such as magnetic switching. The lectures are delivered every two weeks at the Air Force Institute of Technology and the Air Force...
Topics: DTIC Archive, AIR FORCE WEAPONS LAB KIRTLAND AFB NM, *INSTRUCTIONAL MATERIALS, *POWER SUPPLIES,...
This paper describes the pulse power curriculum. It begins with a description of a pulse power system. Curriculum development is discussed, and the curriculum is described. Unique features include a required thesis, and a very applications oriented design course. Supporting activities of other agencies are also described.
Topics: DTIC Archive, AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH, *POWER SUPPLIES, *PULSES,...
As a vibrant and growing field of endeavor, pulsed power has a need at this time for an organized collection of literature pertinent to the field. As a result, a comprehensive bibliography of pulsed power is being compiled to provide researchers and students in this field a guide to the literature. The bibliography will consist of citations pertaining to energy storage, switching, particle beam generation and transport, power conditioning and transport, breakdown, and diagnostics. The...
Topics: DTIC Archive, AIR FORCE WEAPONS LAB KIRTLAND AFB NM, *POWER CONDITIONING, *PULSES,...
Pulse power systems employing inductive store/opening switch technology represent attractive drivers for high energy, high power plasma experiments. Employing electrically exploding conductor (fuse) opening switches, an inductive pulse compression system has been built, tested and is in routine use as a power conditioning system charged by a 2 MJ capacitive primary store at the AFWL. The switch, interrupting 15-20 MA currents against 300-500 KV voltages decreases the risetime of the low...
Topics: DTIC Archive, AIR FORCE WEAPONS LAB KIRTLAND AFB NM, *PULSE COMPRESSION, CAPACITORS, CIRCUITS,...
A foil implosion system is described that integrates an explosive flux-compression generator, a flat plate feed section with power conditioning switches, and a vacuum electrode region containing a cylindrical foil/plasma load. Power conditioning, obtained with an explosive-driven plasma compression opening switch and explosive-actuated closing switches, provides a submicrosecond multimegampere pulse for the implosion of an aluminum plasma. The flat plate section is configured for bidirectional...
Topics: DTIC Archive, LOS ALAMOS NATIONAL LAB NM, *FOILS(MATERIALS), *IMPLOSIONS, *POWER CONDITIONING,...
Power conditioning systems for high peak and average power, high repetition rate discharge excited lasers involve operation of modulator components in unconventional regimes. Reliable operation of switches and energy storage elements under high voltage and high direct conditions is a pacing item for laser development at the present time. To test and evaluate these components a Modulator Component Test Facility (MCTF) was constructed. The MCTF consists of a command charge system, energy storage...
Topics: DTIC Archive, LAWRENCE LIVERMORE NATIONAL LAB CA, *TEST FACILITIES, *THYRATRONS, CIRCUITS, ENERGY...
A pulsed power lecture series coordinated by Texas Tech University for the U.S. Air Force is described. A total of 46 lectures have been presented by various experts in the field and some 25 instructional modules have been printed so far. The nature of the lectures and the instructional modules is described. The experience with using these modules in regular classroom teaching is discussed.
Topics: DTIC Archive, TEXAS TECH UNIV LUBBOCK, *EDUCATION, *ELECTRICAL ENGINEERING, *LECTURES, CIRCUITS,...
Two approaches for using explosives to interrupt current flowing in solid conductors are described. One concept uses explosives to extrude the switch conductor into thin regions that fuse due to current in the switch. A preliminary scaling law is presented. The second approach employs dielectric jets to sever current carrying conductors. A feasibility experiment and an improved design are described.
Topics: DTIC Archive, LOS ALAMOS NATIONAL LAB NM, *ELECTRIC CONDUCTORS, CIRCUITS, DEFORMATION, EXPLOSIVES,...
High explosive pulsed power (HEPP) techniques can address a wide range of pulsed power needs. The basis for HEPP techniques is the use of high explosives to reduce the inductance of a current-carrying circuit, thus multiplying the current due to magnetic flux conservation. For the past twenty years at Los Alamos, our high energy density physics (HEDP) program has followed a path leading to more sophisticated and higher current (and often power) systems. Twenty years ago, we had the capability...
Topics: DTIC Archive, LOS ALAMOS NATIONAL LAB NM, *HIGH EXPLOSIVES, *PULSE GENERATORS, CIRCUITS,...
A 0.4 megawatt per pound battery/capacitor system is a viable means to power a Small-Caliber Electromagnetic Launcher (SCEML). A SCEML testbed is in operation at our Laboratory which uses a 55 pound, 0.9 kilojoule per kilogram electrolytic capacitor discharge sub-system and a demountable, compact SCEML that serves as the switch and load. A secondary battery sub-system that weighs 45 pounds has been designed to operate up to 1000 volts and is capable of charging the capacitors at a 1.0 Hertz...
Topics: DTIC Archive, ARMY LAB COMMAND FORT MONMOUTH NJ ELECTRONICS TECHNOLOGY AND DEVICES LAB,...
The goal of the LAGUNA experimental series of the Los Alamos National Laboratory TRAILMASTER program is to accelerate an annular aluminum plasma z-pinch to greater than one hundred kilojoules of implosion kinetic energy. To accomplish this, an electrical pulse 5.5 MA must be delivered to a 20 nH load in 1 microsecond. The pulsed power system for these experiments consists of a capacitor bank for initial energy storage, a helical explosive-driven magnetic-flux compression generator for the prime...
Topics: DTIC Archive, LOS ALAMOS NATIONAL LAB NM, *CAPACITORS, *ENERGY STORAGE, *IMPLOSIONS, *KINETIC...
Increasing energy needs push industry to build more sustainable and efficient systems. One of the methods to achieve energy efficiency is to feed wasted energy generated by a system itself during operation back to the system. Vibrational energy is one of the most common ambient energy forms in mechanical systems and can be converted into electrical energy with the implementation of piezoelectric energy harvesters. What makes this possible is the piezoelectric effect that some crystals and...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *ENERGY HARVESTING, *MICROELECTROMECHANICAL...
The generation of high power microwaves using explosively driven pulsed power is of particular interest to the defense community. The high energy density of explosives provides the opportunity to design pulsed power systems which occupy significantly less volume, yet provide the same output power, as traditional methods of High Power Microwave (HPM) production. Utilizing a Flux Compression Generator (FCG) as explosive driver necessitates introducing an intermediate Power Conditioning System...
Topics: DTIC Archive, TEXAS TECH UNIV LUBBOCK CENTER FOR PULSED POWER AND POWER ELECTRONICS, *POWER...
Pulsed Power Hydrodynamics (PPH) is an application of low-impedance pulsed power, and high magnetic field technology to the study of advanced hydrodynamic problems, instabilities, turbulence, and material properties. PPH can potentially be applied to the study of the properties of warm dense matter (WDM) as well. Exploration of the properties of warm dense matter such as equation of state, viscosity, conductivity is an emerging area of study focused on the behavior of matter at density near...
Topics: DTIC Archive, LOS ALAMOS NATIONAL LAB NM, *ELECTROMAGNETIC PULSES, *HYDRODYNAMICS, ENERGETIC...
A 15kJoule, Flash Lamp Power Conditioning Unit has been successfully designed, developed, and deployed in the National Ignition Facility (NIF) Preamplifier Modules (PAM). The primary design philosophy of this power conditioning unit (PCU) is safety, reliability, and manufacturability. Cost reduction over commercially equivalent systems was also achieved through an easily manufactured packaging design optimized to meet NIF requirements. While still maintaining low cost, the PCU design includes a...
Topics: DTIC Archive, LAWRENCE LIVERMORE NATIONAL LAB CA, *POWER CONDITIONING, CONTROL SYSTEMS, COST...
The NIF Power Conditioning System provides the pulsed excitation required to drive flashlamps in the laser s optical amplifiers. Modular in design, each of the 192 Main Energy Storage Modules (MESMs) storage up to 2.2 MJ of electrical energy in its capacitor bank before delivering the energy to 20 pairs of flashlamps in a 400 s pulse (10% power points). The peak current of each MESM discharge is 0.5 MA. Production, installation, commissioning and operation of the NIF Power Conditioning continue...
Topics: DTIC Archive, LAWRENCE LIVERMORE NATIONAL LAB CA, *POWER CONDITIONING, ENERGY STORAGE, FLASH LAMPS,...
The University of Missouri-Columbia is developing a compact pulsed power system to condition the high current signal from a flux compression generator (FCG) to the high voltage, high frequency signal required for many pulsed power applications. The system consists of a non-magnetic core, spiral-wound transformer, series exploding wire fuse, and an oscillating mesoband source. The flux compression generator is being built by Texas Tech Univ. and is designed to drive inductive loads on the order...
Topics: DTIC Archive, MISSOURI UNIV-COLUMBIA, *HIGH VOLTAGE, *POWER CONDITIONING, *PULSE GENERATORS,...
Air Force bases, having been constructed many years ago, employ old, inefficient power distribution systems. In order to comply with the Energy Policy Act of 1992, the Air Force must reduce energy consumption. One way of doing this is to install more efficient power distribution equipment, which will cut energy losses during distribution. The first purpose of this paper is to find off-the-shelf power distribution equipment that can be implemented to increase the efficiency.
Topics: DTIC Archive, ALFRED UNIV NY, *ELECTRIC POWER DISTRIBUTION, EFFICIENCY, ENERGY CONSUMPTION, POWER...
This report summarizes the activities at the Advanced Microgrid Concepts and Technologies workshop hosted by the U.S. Army Research Laboratory (ARL) on June 7 8, 2012, in Washington Beltsville, MD. The workshop gathered experts from academia, national labs, Department of the Army (DA), and industry to assist the Army in identifying and prioritizing research and development (R&D) areas relevant to microgrid technologies. The workshop consisted of six technical sessions in the areas of Power...
Topics: DTIC Archive, ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE, *ENERGY...
The Silicon carbide (SiC) device area is presently limited by material and processing defects. To meet the large current handling requirements of modern power conditioning systems, the paralleling of a large number of devices is required. This can increase costs and complexity through wafer dicing, device soldering, the inclusion of ballast resistors, and the formation of multiple wire bonds. Furthermore, paralleling numerous discrete devices increases package volume and weight and reduces...
Topics: DTIC Archive, NORTHROP GRUMMAN SYSTEMS CORP LINTHICUM MD ELECTRONIC SYSTEMS, *ELECTRIC CONNECTORS,...
To meet the large current handling requirements of modern power conditioning systems, paralleling of a large number of devices is required. This increases cost and complexity through dicing, soldering, and forming multiple wire bonds. Furthermore, paralleling discrete devices increases package volume/weight and reduces power density. To overcome these complexities, PiN diodes were designed, fabricated at high yields, tested, and interconnected on a three-inch 4H-SiC wafer to form an 11.72 cm2...
Topics: DTIC Archive, NORTHROP GRUMMAN CORP LINTHICUM HEIGHTS MD ELECTRONIC SENSORS AND SYSTEMS DIV,...
Air Force currently has a strong need for the development of compact capacitors which are mechanically robust and thermally stable for operation in a variety of aerospace power conditioning applications. These applications demand better reliability and flexibility in the power system design as well as decreased thermal load for electronic system cooling. While power conditioning capacitors typically use polycarbonate (PC) dielectric films in wound capacitors for operation from -55 deg C to 125...
Topics: DTIC Archive, DAYTON UNIV OH RESEARCH INST, *DIELECTRIC FILMS, POLYMERS, ELECTRONIC EQUIPMENT,...
The objective of the delivery order (DO) is to develop high energy density polymer dielectrics and optimize their film processing methods for utilization in stacked or rolled capacitor architectures. An emphasis should be placed upon obtaining a material with a high energy density ( 10 J/cc), a low dissipation factor (0.001 percent) and a rapid discharge rate, all of which are stable over a wide temperature range (-55 deg C to 250 deg C), and up to high frequencies (400 kHz when packaged). A...
Topics: DTIC Archive, DAYTON UNIV RESEARCH INST (URDI) OH METALS AND CERAMICS DIV, *POLYMERIC FILMS,...
This report describes a thermal analysis for a power conditioning unit for the M119 A1 howitzer. The analysis includes conduction, convection, and radiation as described by the Army's rigorous environmental standards. The analysis was completed using computational fluid dynamics in the STAR-CCM+ software package. The analysis estimated the maximum temperature of various components. Most components are predicted to exceed their allowable operating temperature. Some components are predicted to...
Topics: DTIC Archive, ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ...
High power RF systems have increasing potential for application by the Army. High power RF, or high power microwave (HPM), systems can disrupt or disable enemy communications and weapons systems. Fundamental constraints on the availability of HPM sources to the war fighter are the size and portability. Traditional pulsed power systems capable of producing high power RF signals are massive and stationary, making their implementation on the battlefield impractical. Additionally, most systems are...
Topics: DTIC Archive, MISSOURI UNIV-COLUMBIA, *SOURCES, *RADIOFREQUENCY, *POWER CONDITIONING, *HIGH POWER,...
