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Jul 26, 2010
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Walatka, Pamela P.; Buning, Pieter G.; Pierce, Larry; Elson, Patricia A
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PLOT3D is a computer graphics program designed to visualize the grids and solutions of computational fluid dynamics. Seventy-four functions are available. Versions are available for many systems. PLOT3D can handle multiple grids with a million or more grid points, and can produce varieties of model renderings, such as wireframe or flat shaded. Output from PLOT3D can be used in animation programs. The first part of this manual is a tutorial that takes the reader, keystroke by keystroke, through...
Topics: POWER CONDITIONING, RESOURCE ALLOCATION, VALUE ENGINEERING, SCHEDULING, SOLAR ENERGY CONVERSION,...
Results of the phase B study contract for the definition of the space station Electric Power System (EPS) are presented in detail along with backup information and supporting data. Systems analysis and trades, preliminary design, advanced development, customer accommodations, operations planning, product assurance, and design and development phase planning are addressed. The station design is a hybrid approach which provides user power of 25 kWe from the photovoltaic subsystem and 50 kWe from...
Topics: NASA Technical Reports Server (NTRS), DESIGN ANALYSIS, PHOTOVOLTAIC CONVERSION, SOLAR ARRAYS, SOLAR...
A design concept of the coil gun together with its power conditioning unit as an integrated system has been developed. The coil gun operates on the principle of the classical multiphase induction machine, and can therefore be called a linear induction launcher (LIL). It has the advantage of eliminating the need for accurate synchronization of the switching sequence. The projectile consists of a payload housed within a conductive sleeve. Strong centering forces due to the currents in the sleeve...
Topics: DTIC Archive, Zabar, Zivan, POLYTECHNIC UNIV BROOKLYN NY DEPT OF ELECTRICAL ENGINEERING AND...
The effect of silicon carbide (SiC) electronics operating temperatures on Power Management and Distribution (PMAD), or Power Conditioning (PC), subsystem radiator size and mass requirements was evaluated for three power output levels (100 kW(e) , 1 MW(e), and 10 MW(e)) for near term technology ( i.e. 1500 K turbine inlet temperature) Closed Cycle Gas Turbine (CCGT) power systems with a High Temperature Gas Reactor (HTGR) heat source. The study was conducted for assumed PC radiator temperatures...
Topics: NASA Technical Reports Server (NTRS), OPERATING TEMPERATURE, RADIATION HARDENING, SILICON CARBIDES,...
The Fluid Combustion Facility (FCF) Project and the Power Technology Division at the NASA Glenn Research Center (GRC) at Lewis Field in Cleveland, OH along with the Sundstrand Corporation in Rockford, IL are jointly developing an Electrical Power Converter Unit (EPCU) for the Fluid Combustion Facility to be flown on the International Space Station (ISS). The FCF facility experiment contains three racks: A core rack, a combustion rack, and a fluids rack. The EPCU will be used as the power...
Topics: NASA Technical Reports Server (NTRS), POWER CONVERTERS, SPACECRAFT POWER SUPPLIES, POWER MODULES...
NASA has proposed a bold mission to orbit and explore the moons of Jupiter. This mission, known as the Jupiter Icy Moons Orbiter (JIMO), would significantly increase NASA s capability to explore deep space by making use of high power electric propulsion. One electric propulsion option under study for JIMO is an ion propulsion system. An early version of an ion propulsion system was successfully used on NASA's Deep Space 1 mission. One concept for an ion thruster system capable of meeting the...
Topics: NASA Technical Reports Server (NTRS), ELECTRIC PROPULSION, NASA SPACE PROGRAMS, POWER CONDITIONING,...
Power management and distribution (PMAD) models were developed in the early 1990's to model candidate architectures for various Space Exploration Initiative (SEI) missions. They were used to generate "ballpark" component mass estimates to support conceptual PMAD system design studies. The initial set of models was provided to NASA Lewis Research Center (since renamed Glenn Research Center) in 1992. They were developed to estimate the characteristics of power conditioning components...
Topics: NASA Technical Reports Server (NTRS), PERFORMANCE PREDICTION, POWER CONDITIONING, MATHEMATICAL...
The feasibility of inertial energy storage in a spacecraft power system is evaluated on the basis of a conceptual integrated design that encompasses a composite rotor, magnetic suspension and a permanent magnet (PM) motor/generator for a 3-kW orbital average payload at a bus distribution voltage of 250 volts dc. The conceptual design, is referred to as a Mechanical Capacitor. The baseline power system configuration selected is a series system employing peak-power-tracking for a Low...
Topics: NASA Technical Reports Server (NTRS), ELECTROCHEMISTRY, ENERGY STORAGE, FLYWHEELS, SPACE SHUTTLE...
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,...
In anticipation of the needs of future light-weight, low-power spacecraft, arcjet power electronics in the 100 to 400 W operating range were developed. Limited spacecraft power and thermal control capacity of these small spacecraft emphasized the need for high efficiency. Power topologies similar to those in the higher 2 kW and 5 to 30 kW power range were implemented, including a four transistor bridge switching circuit, current mode pulse-width modulated control, and an output current...
Topics: NASA Technical Reports Server (NTRS), ARC JET ENGINES, ELECTROMAGNETIC COMPATIBILITY, PHASE SHIFT...
The initial design and evaluation of a 5 kW arcjet power electronics breadboard which as been integrated with a modified 1 kW design laboratory arcjet is presented. A single stage, 5 kW full bridge, pulse width modulated (PWM), power converter was developed which was phase shift regulated. The converter used metal oxide semiconductor field effect transistor (MOSFET) power switches and incorporated current mode control and an integral arcjet pulse ignition circuit. The unoptimized power...
Topics: NASA Technical Reports Server (NTRS), ARC JET ENGINES, BREADBOARD MODELS, ELECTRIC BRIDGES, POWER...
The Space Station Freedom Electric Power System (EPS) will convert solar energy into electric energy and distribute the same using an 'all dc', Power Management and Distribution (PMAD) System. Power conditioning devices (dc to dc converters) are needed to interconnect parts of this system operating at different nominal voltage levels. Operation of such devices could generate under damped oscillations (instability) under certain conditions. Criteria for instability are examined and verified for...
Topics: NASA Technical Reports Server (NTRS), ELECTROMAGNETIC PULSES, POWER CONDITIONING, SOLAR ENERGY,...
The U.S. Army Strategic Defense Command (USASDC) solicited proposals for new and innovative particle beam technologies which are relevant to the Neutral Particle Beam (NPB) Program. Since high brightness beams are required for NPB and beam emittance, in large part, is determined by the ion source and low energy matching section, innovations to improve the quality or efficiency of the low energy beam transport (LEBT) are important. Some preliminary studies on radio frequency quadrupole (RFQ)...
Topics: DTIC Archive, Swenson, D A, SCIENCE APPLICATIONS INTERNATIONAL CORP (SAIC) ALBUQUERQUE NM,...
Phosphoric acid fuel cell power plants for use as tactical utility power sources have been developed. The power plants operate on 58% methanol-42% water fuel. Two fully automatic 3kW units were built, tested, and delivered. Thermal efficiency was 23% with AC and 26% with DC output. A brassboard 3kW power plant operating on neat methanol was also constructed, tested, and delivered. The methanol-water premix fuel cell power plant operates on a 1:1.3 molar mixture of methanol and water which is...
Topics: DTIC Archive, Abens, S., ENERGY RESEARCH CORP DANBURY CT, *ELECTRIC POWER PLANTS, *CARBINOLS,...
This report describes the experience gained and lesson learned from the ongoing field evaluations of seven small, 2-to 20-kW wind energy conversion systems (WECS) at Navy installations located in the Southern California desert, on San Nicolas Island, in California, and in Kaneohe Bay, Hawaii. The field tests show that the WECS's bearings and yaw slip-rings are prone to failure. The failures were attributed to the corrosive environment and poor design practices. Based upon the field tests, it is...
Topics: DTIC Archive, Pal, D, NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA, *ENERGY CONVERSION, *TURBINES,...
This report presents general information covering site wind potential and characteristics, specific design, system design, and siting requirements for utilization of wind energy conversion systems (WECS) at Navy installations. The objective of this report is also to provide a method for performing economic analysis to plan and justify a WECS in a particular Navy application. The information presented here is sufficient to enable an engineer to prepare a system's design to conduct a feasibility...
Topics: DTIC Archive, Pal,D, CIVIL ENGINEERING LAB (NAVY) PORT HUENEME CA, *WIND, *ENERGY CONVERSION, *WIND...
The creation of the Strategic Defense Initiative Organization (SDIO) in 1983 has established a challenge to the technical community to provide the required science and engineering necessary to achieve the objectives of the SDIO. This technical challenge is present in the requirements for minimum mass, high performance power conditioning systems capable of achieving the space-based SDIO mission applications. Transformers and their related structure are major components of the power conditioning...
Topics: DTIC Archive, Swallom, Daniel W., AVCO RESEARCH LAB INC EVERETT MA, *LIGHTWEIGHT, *POWER...
The current state of the technology in flywheel storage systems and ancillary components, the technology in light of future requirements, and technology development needs to rectify these shortfalls were identified. Technology efforts conducted in Europe and in the United States were reviewed. Results of developments in composite material rotors, magnetic suspension systems, motor/generators and electronics, and system dynamics and control were presented. The technology issues for the various...
Topics: NASA Technical Reports Server (NTRS), ATTITUDE CONTROL, CONFERENCES, ENERGY STORAGE, FLYWHEELS,...
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242
Jul 11, 2010
07/10
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QUEMARD, C.; MIGNOSI, A.; SERAUDIE, A
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THE PROBLEM OF STARTING AN INDUCTION WIND TUNNEL WITH RETURN CIRCUIT IS DISCUSSED. THE BASIC EQUATIONS GOVERNING START-UP ARE GIVEN, AND THE PRINCIPAL EXPERIMENTS CONDUCTED WITH THE T PRIME SUB 2 WIND TUNNEL WITH PERIPHERAL INJECTION ARE SHOWN. FINALLY THE RESULTS OF EXPERIMENTS ABD OF THE COMPUTATION ARE DISCUSSED AND A COMPARISON OF EXPERIMENT AND COMPUTATION IS MADE.
Topics: LIE GROUPS, POWER CONDITIONING, CONTROL THEORY, MATHEMATICAL MODELS, NETWORK SYNTHESIS
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Jul 12, 2010
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Descriptive and analytical information useful for the optimal design, specification, and performance evaluation of deep space telecommunications systems is presented. Telemetry, tracking, and command systems, receiver design, spacecraft antennas, frequency selection, interference, and modulation techniques are addressed.
Topics: ELECTRIC POTENTIAL, FLAT PLATES, PHOTOVOLTAIC CELLS, POWER CONDITIONING, CLIMATE, COMPUTERIZED...
The effects of nuclear radiation and high temperature environments must be fully known and understood for the electronic components and materials used in both the Power Conditioning and Control subsystem and the reactor Instrumentation and Control subsystem of future high capacity nuclear space power systems. This knowledge is required by the designer of these subsystems in order to develop highly reliable, long-life power systems for future NASA missions. A review and summary of the...
Topics: NASA Technical Reports Server (NTRS), HIGH TEMPERATURE ENVIRONMENTS, NUCLEAR PROPULSION, NUCLEAR...
To insure the reliability of a 20 kHz, AC power system on spacecraft, it is essential to analyze its behavior under many adverse operating conditions. Some of these conditions include overloads, short circuits, switching surges, and harmonic distortions. Harmonic distortions can cause malfunctions in equipment that the power system is supplying, and during extreme distortions such as voltage resonance, it can cause equipment and insulation failures due to the extreme peak voltages. HARMFLO, a...
Topics: NASA Technical Reports Server (NTRS), AC GENERATORS, ALTERNATING CURRENT, COMPUTER PROGRAMMING,...
The basic goal was to advance the development status of the 30-cm electron bombardment ion thruster from a laboratory model to a flight-type engineering model (EM) thruster. This advancement included the more conventional aspects of mechanical design and testing for launch loads, weight reduction, fabrication process development, reliability and quality assurance, and interface definition, as well as a relatively significant improvement in thruster total efficiency. The achievement of this goal...
Topics: NASA Technical Reports Server (NTRS), ION ENGINES, LOW THRUST PROPULSION, AUTOMATIC CONTROL,...
Startup, operation in grid connect mode, shutdown from grid connects, operation in isolated mode, shutdown from isolated mode, steady state operation, mode transfers, and voltage disconnects are addressed.
Topics: NASA Technical Reports Server (NTRS), ELECTRIC POWER PLANTS, FUEL CELL POWER PLANTS, POWER...
Critical Design Reviews (CDR's) were held on the Solar Dynamic Ground Test Demonstrator (SDGTD). This CDR summary report will provide the following information for each of the system components and the system integration: (1) A bibliography of design/design review documentation; (2) A summary of the major discussion issues from issues from each design review; (3) A definition of the component and system detail designs along with the bottom line from the supporting analysis; (4) Status and key...
Topics: NASA Technical Reports Server (NTRS), GROUND TESTS, SYSTEMS INTEGRATION, BRAYTON CYCLE, SOLAR...
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,...
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512
Jul 26, 2010
07/10
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Parker, David Hu
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Although small scale magnetic suspension and balance systems (MSBSs) for wind tunnel use have been in existence for many years, they have not found general application in the production testing of flight vehicles. One reason for this is thought to lie in the relatively limited range of attitudes over which a wind tunnel model may be suspended. Modifications to a small MSBS to permit the suspension and control of axisymmetric models over angles of attack from less than zero to over ninety...
Topics: COMPUTERIZED SIMULATION, ENERGY CONVERSION EFFICIENCY, POWER CONDITIONING, PULSE DURATION...
The Cuk DC to DC Switching Converter was developed by Caltech Professors, Slobodan Cuk and R. D. Middlebrook. The converter changes unsuitable dc voltage into one or more voltages suitable for powering electronic equipment; it can also be used in converting dc current to ac and vice versa. It was named one of the 100 most significant technical advances of 1979. The Cuk converter is more efficient than previous conversion devices, simpler, smaller, lighter, cheaper and highly reliable. The first...
Topics: NASA Technical Reports Server (NTRS), POWER SUPPLIES, VOLTAGE CONVERTERS (DC TO DC), ELECTRONIC...
This report discusses the results of testing high-voltage, high-power, solid-state remote power controllers (RPC) using RPCs designed and built by John C. Sturman at the Lewis Research Center, Cleveland, Ohio, and utilizing the Autonomously Managed Power Systems (AMPS) breadboard/test facility. These test results are used to determine usefulness of the RPCs for future applications in high-voltage direct-current space power.
Topics: NASA Technical Reports Server (NTRS), HIGH VOLTAGES, POWER CONDITIONING, REMOTE CONTROL, SOLID...
NASA Lewis Research Center is presently developing a 60 GHz traveling wave tube for satellite cross-link communications. The operating voltage for this new tube is - 20 kV. There is concern about the high voltage insulation system and NASA is planning a space station high voltage experiment that will demonstrate both the 60 GHz communications and high voltage electronics technology. The experiment interfaces, requirements, conceptual design, technology issues and safety issues are determined. A...
Topics: NASA Technical Reports Server (NTRS), CROSSLINKING, ELECTRIC POTENTIAL, HIGH VOLTAGES, POWER...
Requirements for development of a Transformerless Power Conditioning Subsystem (TPCS) that will meet utility, manufacturer, and customer needs are detailed. Issues analyzed include current utility guidelines, safety and grounding issues that appear as local codes, various kinds of TPCS connections that can be developed, dc injection, and a brief survey of TPCS circuit topologies that will meet requirements. The major result is that a finite time exists for control operation before dc injection...
Topics: NASA Technical Reports Server (NTRS), AUTOMATIC CONTROL, ELECTRICAL ENGINEERING, POWER...
The purpose of this research was to investigate the feasibility of multiphase high frequency power distribution systems driven by Schwartz converters. The two systems to be studied are a single phase parallel module cascaded Schwartz converter. The single phase version consists of two power conditioning stages. The first stage contains a single Schwartz converter which operates in a variable frequency mode and acts as a regulated dc power supply. This mode of operation is used to maintain a...
Topics: DTIC Archive, Stuart, Thomas A, TOLEDO UNIV OH DEPT OF ELECTRICAL ENGINEERING, *ALTERNATING...
This report covers effort under Contract DAAK70-77-C-0035 to further develop the ac-to-dc section or converter portion of a 15 kW general purpose power conditioner or frequency changer. Previous Delco effort under Contract DAAK02-72-C-0210 had provided a breadboard system which established the feasibility of using resonant converter concepts coupled with Delco's power center inverter for the 15 kW general purpose frequency changer. MERADCOM testing of the breadboard frequency changer revealed...
Topics: DTIC Archive, GENERAL MOTORS CORP GOLETA CALIF DELCO ELECTRONICS DIV, *POWER CONDITIONING,...
The development of software is described to aid in design and analysis of AC power systems for large spacecraft. The algorithm is an important version of harmonic power flow program, HARMFLO, used for the study of AC power quality. The new program is applicable to three-phase systems typified by terrestrial power systems, and single-phase systems characteristic of space power systems. The modified HARMFLO accommodates system operating frequencies ranging from terrestrial 60 Hz to and beyond...
Topics: NASA Technical Reports Server (NTRS), AEROSPACE VEHICLES, ALTERNATING CURRENT, COMPUTER PROGRAMS,...
A motor development program to explore the feasibility of electronically commutated dc motors (also known as brushless) for electric cars is described. Two different design concepts and a number of design variations based on these concepts are discussed. One design concept is based on a permanent magnet, medium speed, machine rated at 7000 to 9000 rpm, and powered via a transistor inverter power conditioner. The other concept is based on a permanent magnet, high speed, machine rated at 22,000...
Topics: NASA Technical Reports Server (NTRS), COMMUTATION, ELECTRIC MOTOR VEHICLES, MAGNETS, POWER...
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,...
When engineers diagnose system failures, they often use models to confirm system operation. This concept has produced a class of advanced expert systems that perform model-based diagnosis. A model-based diagnostic expert system for the Space Station Freedom electrical power distribution test bed is currently being developed at the NASA Lewis Research Center. The objective of this expert system is to autonomously detect and isolate electrical fault conditions. Marple, a software package...
Topics: NASA Technical Reports Server (NTRS), APPLICATIONS PROGRAMS (COMPUTERS), DIGITAL SYSTEMS,...
The design is described of the Space Station Freedom Power Management and Distribution (PMAD) System. In addition, the significant trade studies which were conducted are described, which led to the current PMAD system configuration.
Topics: NASA Technical Reports Server (NTRS), DESIGN ANALYSIS, SPACE STATION FREEDOM, SPACE STATION POWER...
The Autonomous Power Expert (APEX) system was designed to monitor and diagnose fault conditions that occur within the Space Station Freedom Electrical Power System (SSF/EPS) Testbed. APEX is designed to interface with SSF/EPS testbed power management controllers to provide enhanced autonomous operation and control capability. The APEX architecture consists of three components: (1) a rule-based expert system, (2) a testbed data acquisition interface, and (3) a power scheduler interface. Fault...
Topics: NASA Technical Reports Server (NTRS), ARCHITECTURE (COMPUTERS), AUTONOMY, EXPERT SYSTEMS, FAULT...
The effects of neutron and gamma rays on the electrical and switching characteristics of power semiconductor switches must be known and understood by the designer of the power conditioning, control, and transmission subsystem of space nuclear power systems. The SP-100 radiation requirements at 25 m from the nuclear source are a neutron fluence of 10(exp 13) n/sq cm and a gamma dose of 0.5 Mrads. Experimental data showing the effects of neutrons and gamma rays on the performance characteristics...
Topics: NASA Technical Reports Server (NTRS), ANNEALING, GAMMA RAYS, NEUTRONS, POWER CONDITIONING,...
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Jul 12, 2010
07/10
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NON
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The focus of the workshop was the basic research program assembled by LaRC to address the fundamental technology deficiencies that were identified in several studies on large space systems (LSS) conducted by NASA in the last several years. The staffs of the respective participants were assembled at the workshop to review the current state of research in the control technology for large structural systems and to plan the efforts that would be pursued by their respective organizations.
Topics: COAL UTILIZATION, INDUSTRIAL SAFETY, IONIZING RADIATION, POWER CONDITIONING, REACTOR SAFETY, SOLAR...
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Jul 26, 2010
07/10
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NON
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No Abstract Available
Topics: EXTREME ULTRAVIOLET RADIATION, PLANETARY ATMOSPHERES, POWER CONDITIONING, SATURN (PLANET), PIONEER...
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,...
Several basic aspects of pulsed power systems supplying repetitive pulses and using inductive energy storage are investigated. These include the method of inductor charging, the efficiency of discharging with a resistive opening switch, the limitations of thermally driven resistors as opening switches, the design of pulse forming networks for time-varying resistive loads and the relative merits of voltage-fed versus current-fed networks, and some limitations on inductors. (Author)
Topics: DTIC Archive, Trost,Thomas F, TEXAS TECH UNIV LUBBOCK DEPT OF ELECTRICAL ENGINEERING, *PULSE...
Cryogenically cooling power conditioning systems in space-based multi-megawatt power systems will reduce system mass, volume, and complexity. Cryogenically cooled generators and power transmission systems for space are already under development. These generators and transmission busses are considerably lighter and more compact than comparable room temperature components. Most of the mass and volume savings results from the greatly increased electrical conductivity of metals cooled to cryogenic...
Topics: DTIC Archive, Johnson, Donald E., IAP RESEARCH INC DAYTON OH, *POWER CONDITIONING, *CRYOGENICS,...
Power Electronic Building Blocks (PEBBs) are power processors. A PEBB is not a specific semiconductor material, not a device, nor a circuit topology. It is the search for the most common denominator of all these things. It is not; "one size fits all." there will be several blocks that will fit together to perform the majority of every day power electronic jobs. Like a set of children's interlocking blocks, PEBBs will be a rational and simple set of blocks and procedures that most any...
Topics: DTIC Archive, Morris, Fiona, INSTITUTE OF MARINE ENGINEERS LONDON (UNITED KINGDOM), *SYMPOSIA,...
The initial phase of the project was the development of a breadboard circuit capable of performing all the electrical functions of a three-phase frequency converter. After demonstration of three-phase performance, the work scope was extended to further develop the breadboard circuits to produce 10 kW of single-phase power at 60 Hz or 400 Hz. Concurrent with development of the 10 kW frequency converter, Delco developed improved step voltage commutation methods for a 100 kW frequency converter...
Topics: DTIC Archive, Corry,T, GENERAL MOTORS CORP GOLETA CALIF DELCO ELECTRONICS DIV, *FREQUENCY...
A power processing unit for a 15 kW Hall thruster is under development at NASA Glenn Research Center. The unit produces up to 400 VDC with two parallel 7.5 kW discharge modules that operate from a 300 VDC nominal input voltage. Silicon carbide MOSFETs and diodes were used in this design because they were the best choice to handle the high voltage stress while delivering high efficiency and low specific mass. Efficiencies in excess of 97 percent were demonstrated during integration testing with...
Topics: NASA Technical Reports Server (NTRS), HALL THRUSTERS, HIGH VOLTAGES, SPACECRAFT POWER SUPPLIES,...
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,...
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,...
