... and a pair of positive and negative switching DC/DC converter sections connected to said AC/DC converter section and receiving a pair of positive ...

leg regulates the voltages on their capacitors independently of the others. Main Features #12;AC/DC/AC C: value of the DC-link capacitors Voltage Oscillation Amplitude #12;AC/DC/AC Converters: TwoAC/DC/AC Converters: Two-Level and Multilevel VSI Page 1 Socrates � Erasmus ...

converter after the micro-power- generators. The AC/DC converter is followed by an adaptive DC/DC converter generator is rectified using an AC/DC converter. Then a DC/DC converter is used to match the output of ...

... Extension of the NIST AC-DC Difference ... The NIST primary standards of ac-dc difference for current are multijunction thermal converters (MJTCs). ...

Abstract�This paper discusses the basic construction procedure and topological possibilities of creating ac/dc converters out of simple dc/dc converters. It is shown that two separately controlled dc/dc converters are sufficient for producing a regulated ...

for geared system, pm or synchronous for DD. Generator-side converter converts AC electric power to DC Line-side converter converts DC to system-frequency AC (50 Hz or 60...

... The use of pn junctions as photovoltaic converters with high photon densities ... An Esaki diode DC-AC converter is under investigation and design ...

This patent describes a static converter system operating between opposite ones of respective AC and DC buses. It comprises: at least three rectifier bridges connected in parallel to the DC buses, each rectifier bridge having three AC lines connected to the middle point of two rectifier devices ...

967 Generating Isolated Outputs in a Multilevel Modular Capacitor Clamped DC-DC Converter (MMCCC features that make it possible to generate ac outputs (10 kHz) from a dc-dc converter circuit. Using those to generate high frequency ac outputs to create isolated ...

The NIST calibration service for ac-dc difference of thermal current converters relies on multijunction thermal converters as the primary standards, and various thermal converters and thermoelements (TEs) as the reference and working standards. The paper ...

The NIST calibration service for ac-dc difference of thermal current converters relies on multijunction thermal converters as the primary standards, and various thermal converters and thermoelements (TEs) as the reference and working standards. Calibratio...

This patent describes a superconductive energy storage circuit comprising an AC/DC converter circuit connected to an AC supply line and capable of controlling an output current. A DC capacitor is connected between the terminals of the DC output of the AC/DC ...

A voltage controlled oscillator which drives a switching circuit for dc-to-ac conversion of dc power is presented. The dc-to-ac converter operates into a ferroresonant voltage stabilizer which limits the amplitude of ac voltage that is then rectified and ...

... the ac-dc difference of a customer's thermal current converter to the ac-dc difference of a ... range from 50 kHz to 100 kHz at currents from 1 mA to 20 A ...

Apparatus for conditioning power generated by an energy source includes an inverter for converting a DC input voltage from the energy source to a square wave AC output voltage, and a converter for converting the AC output voltage from the inverter to a sine wave ...

An energy saving dc-dc converter circuit is disclosed having two energy efficient means which operate in tandem, an energy conserving means and a voltage doubling means. These energy efficient means are applied in combination with elements commonly found in dc-dc converter circuits, namely an ...

... Title : Means for Producing and Controlling Dead-Time of the Switching Transistors DC-to-DC and DC-to-AC Converters. Descriptive Note : Patent,. ...

A Telecom power supply is studied and analyzed from control system viewpoint. It consists of three stages: AC/DC rectifier, a backup battery, and a Telecom load. The AC/DC rectifier stage can be composed of paralleled DC/DC converters preceded by parallel...

A Telecom power supply is studied and analyzed from control system viewpoint. It consists of three stages: AC/DC rectifier, a backup battery, and a Telecom load. The AC/DC rectifier stage can be composed of paralleled DC/DC converters preceded by parallel...

When an unbalanced fault occurs in the ac line in the ac-dc link system, the ac voltage and current of the converters become unbalanced. If the unbalance of the converter ac voltage is large, the dc current is interrupted or does not flow. If the ...

... Title : A DC to AC Converter for Radiation Based on a Laser Ionized Capacitor Array. Descriptive Note : Final technical rept. 1 Apr 95-31 Mar 98. ...

... industrial applications and required a 120-V AC input power supply that was converted to 5-V DC ... ...

Power Factor Correction Circuits for AC-DC Converters. This project targets the declining power quality in the Shuttle's main processing centers in an ...

The feasibility for implementation of a concept for direct ac/dc multikilowatt power conversion with

The system described provides protection for phase sensitive loads from being or remaining connected to ac power lines whenever a phase reversal occurs. It comprises a solid state phase detection circuit, a dc power relay circuit, an ac-to-dc converter fo...

Input current shaping techniques for ac-to-dc converters were investigated. Input frequencies much higher than normal, up to 20 kHz were emphasized. Several methods of shaping the input current waveform in ac-to-dc converters were reviewed. The simplest m...

Feb 1, 1999 ... Basically, an UPS system converts some or all of the AC power into DC for the battery and then back into AC power for the load. ...

A common problem associated with the majority of isolating DC/DC converters and DC/AC inverters (normally with power stages designed to drive a power transformer) is the undesired behavior of the parasitic parameters of the transformer and in particular t...

... 555 PRECISION DC VOLTAGE STANDARD 559 400-CYCLE OSCILLATOR 560 AC - DC CONVERTER 565 TRUCK, HAND, AUTONAVIGATOR ...

... The inverter modulas convert the DC-Link voltage of 200 volts DC to either 60 hertz or 400 hertz AC as determined by the operator. ...

Subject Terms: BIPOLAR TRANSISTORS; DISPLAY DEVICES; ELECTRIC BRIDGES; ELECTRIC CHOPPERS; INVERTED CONVERTERS (DC TO AC); RECTIFIERS; ...

This paper summarizes the results of a study conducted by the US Department of Energy, Office of Energy Storage and Distribution, to determine generic cost differences between dc and ac systems, and to identify situations where dc is clearly advantageous for long distance and bulk power transport. Data are presented which can aid in ...

When a dc link feeds into an ac system where the short circuit ratio is low or very low, the ac voltage requires some form of supplementary control. The concept of a series capacitor located between the ac system and the dc link has been an attractive consideration but is susceptible to ...

A power source provides continuous ac power by employing a bidirectional converter which interfaces a rechargable dc power storage device with ac mains power and ac loads. The bidirectional converter includes a transformer having first and second windings coupled in reverse ...

pulse converter is at most 7 percent worse for the twelve-pulse converter; (2) the ... 75 kW and 2.25 MW, operate as twelve-pulse converters. ...

An uninterruptible power supply is described, said power supply comprising: AC input terminal means for receiving a first AC voltage from an AC power source; DC input terminal means for receiving a first DC voltage from a DC power source; AC output ...

Zeroing Transformer's DC Current in Resonant Converters with No Series Capacitors Alexander. Phone: +972-8-646-1561; Fax: +972-8-647-2949; Emails: gertsman@ee.bgu.ac.il, sby@ee.bgu.ac.il; Website: www.ee.bgu.ac.il/~pel Abstract - DC current unbalance in the windings of a ...

, transportation systems, and etc., which requires a rectifier, a DC bus, and an inverter to obtain arbitrary AC parts, i.e., a virtual front-end AC/DC rectifier and a virtual DC/AC inverter, and synthesizes the switching state of the matrix converter from the both switching states of the ...

capacitor bear both the ac and _VC (t) CEB Vg Vin *1 _ capacitor bearing both ac and dc components of capacitor voltage (b). the dc component of the voltage capacitor voltage and peak inductor and switch currents of the series resonant converter depend strongly

The electric power distribution systems for spacecraft are compared concentrating on two interrelated issues: the choice between dc and high frequency ac, and the converter/inverter topology to be used at the power source. The relative merits of dc and ac...

The termopribor design bureau has developed the PN-025 transistorized voltage inverter. The PN-025 converts 24-v dc into 220-v ac at 50 Hz. The transformer operates under saturation conditions and carries out the switching of the transistor. To stabilize ...

. As a result, capacitor voltages now have an ac ripple component. Energy is lost on the capacitor esr if the ac components in capacitor voltages are smaller. In general, precise knowledge of all networkPERFORMANCE LIMITS OF SWITCHED-CAPACITOR DC-DC CONVERTERS Marek S. Makowski Dragan Maksimovi

with rectifiers to form RF-to-dc converters having narrow-range resistive input characteristics is also treated�dc converter, comprising an inverter stage, a transformation stage, and a rectifier stage [1]�[10]. Manuscript an inverter (dc�ac) circuit, a transformation/matching circuit, ...

consists of a PEM fuel cell source, an auxiliary battery source, two DC/DC power converters, and a DC of the fuel cell, battery, both DC/DC converters, the DC/AC inverter, and the induction motor been seen in literature [1]~[3], but the configurations are not practical for ...

This paper presents the results of theoretical and experimental development of a new dc-ac-dc converter for superconducting magnet power supplies. The basic operating principles of the circuit are described followed by a theoretical treatment of the dynam...

A capacitor-discharge type ignition is described comprising: a vehicle alternating current generator, a current converting means including a voltage doubler rectifier circuit connected in series with DC-DC converter, the voltage doubler being connected to a stator coil of the generator for receiving first low AC ...

Various papers on electronics are presented. The general topics addressed include: inverters and rectifiers, converter modeling and analysis, power semiconductor devices, ZVS dc/dc converters, field-oriented controls, ac/ac and active filters, positioning systems and stepping motors, averaging techniques, PWM ...

The design of a dc converter station grounding system must consider both equipment operation and personnel safety. In representative exercises, a research-grade computer program showed itself capable of analyzing ac or dc faults at the converter station and steady-state operation of the ...

Results achieved by the intermediate power level ac-dc model in Philadelphia demonstrate the unusual features and advantages of this research tool for working toward accomplishment of over-all aims of the project. Insofar as can be determined, it is presently the only facility capable of evaluating the dynamic interactions between ac-dc ...

The paper presents a formulation for coordinating all controllable reactive power sources, including the DC converters of a multiterminal DC system, to correct bus voltage violations. Based on the formulation, an algorithm using Linear Programming solution technique has been developed. The effectiveness of this algorithm to correct bus ...

Papers are presented on the control of switched-mode converter harmonic-free terminal waveforms through internal energy storage; the zero voltage switching technique in dc/dc converters; the use of depletion mode MOSFET devices in synchronous rectification; the switching behavior of a BIMOS switching plate; the effects of coupled ...

The foreseeable shortages in conventional sources of electric power has increased the emphasis on the research and development of alternate sources of energy. In order to make a noteworthy impact, the alternate sources of energy need to be utility interactive by means of a power electronic interface (a dc to ac converter). The inherent ...

Increasing demand for low power consumption in electronics combined with continued miniaturization of electronic device components in today's analogue/digital circuits have reduced the supply voltage to sub-one volt levels. The supply voltage to integrated circuit devices are provided by AC-DC converters, which converts high frequency ...

A DC-AC converter for high inrush current has been designed. The converter has a rating of 3 kW and converts a variable dc-voltage (12-36 V) to a stabilized ac-voltage of 230 V, 50 Hz. The efficiency is currently higher than 87,5%, but can be increased to...

reduced tailpipe emissions. Researchers are testing key power components, including motor controllers, AC to DC converters, and inverters that condition the electrical signal...

Among these are size, weight, efficiency, output voltage distortion for ac systems, out- put ripple for dc systems, transient response, regulation, ...

automation and motion Drives business unit � Dedicated to the manufacturing and marketing of low voltage AC and DC drives, wind turbine converters and solar inverters. �...

... A number of architectures have been reported and discussed, including AC systems, DC systems, constant-voltage systems, constant-current ...

The Advanced Stirling Radioisotope Generator (ASRG), a high efficiency generator ..... Converting AC output of the convertors to direct-current (DC) power at the ...

device for converting alternating current (AC) input into direct current (DC) output. n While en route&I as the Pilot Not Flying /Pilot ...

The possibility of abnormal harmonic generation in an ac system feeding a converter load is examined from the standpoint of automatic control systems used in modern hvdc transmission systems. It is shown that with certain types of automatic controls, the firing angles of converter valves may sustain some errors, which in turn could ...

Modulation of power transmitted over a proposed multiterminal dc system to provide effective stability enhancement of a large ac system in the Southwestern U.S. is demonstrated in this paper. This proposed multiterminal dc system connecting the Phoenix, Mead and Los Angeles areas could be in parallel with an Extra High-Voltage (EHV) ...

Method for eliminating magnetic saturation in low-voltage and high-current DC-DC converter with fast dynamic response is described. The magnetic saturation is observed in onboard isolated bridge-type DC-DC converter due to inherently asymmetrical PWM signal during transient condition. The saturation is not ...

The article discusses electromagnetic processes occurring in ac/dc power converters. The study is based on a general equation which describes both transient and steady-state processes. In terms of symmetric transient processes, (1) calculations are made for the current at the beginning of the n-th repetition period, (2) an equivalent diagram is given, and ...

Matrix converters offer certain advantages over conventional AC-DC-AC conversion such as elimination of reactive elements, inherent bi-directional power flow capability, increased reliability and compactness. This paper explores the reactive and harmonic compensation capability of a matrix converter. Space vector modulation technique ...

With the extensive application of DC power systems, suppression of DC fault current is an important subject that guarantees system security. This paper presents an active superconducting DC fault current limiter (DC-SFCL) based on flux compensation. The DC-SFCL is composed of two ...

This paper summarizes the results of a study conducted by the US Department of Energy, Office of Energy Storage and Distribution, to determine generic cost differences between dc and ac systems, and to identify situations where dc is clearly advantageous for long distance and bulk power transport. Data are presented which can aid in ...

... Characterizing the degradation of Army primers by the AC-DC-AC accelerated test method ... DC AC-DC-AC accelerated testing method Page 5. ...

The design philosophy and the operating behavior of a 5.5 kA, +-2.5 kV converter, being the electrical interface between a high voltage transmission system and a 30 MJ superconducting coil, are documented in this paper. Converter short circuit tests, load tests under various control conditions, dc breaker tests for magnet current ...

A technical and economic feasibility study of HVDC systems without converter transformers is presented. The presentation includes proposed solutions to the drawback related to the absence of galvanic separation between the ac and dc systems, if the converter transformers are eliminated. The results show that HVDC ...

. The system mainly is comprised of a PV cell array with two modules (2 x 300 W, 2 x 50 V), a boost converter to increase the voltage generated by a PV cell module and convert it to an ac output voltage of 120 Vrms. Fig-combined converters are presented. A. Photovoltaic Cell-Module Model A PV cell-module consists ...

A new multiple dc-inputs direct electric-power converter (D-EPC) has been developed. It is placed between multiple dc power sources and an ac motor, thereby eliminating the need for a dc/dc converter that is generally used in conventional ...

The conference presents papers on dc-dc power topologies, inverters and cycloconverters, power semiconductor devices, high-power conversion, dc-to-dc converters, systems and simulation, static power converters, ac drives, analysis and controls. Specific topics include 500 V BIMOS technology and ...

There is no doubt that Hybrid Electrical Vehicle can preserve the environment. These vehicles have several electrical power sources. The power flows among these sources are controlled generally using DC/DC converters. Therefore the DC/DC converter is the important device in HV. This paper shows the method how to ...

Quasi-resonant converters are a family of single-switch resonant dc-dc converters featuring zero-current or zero-voltage switching. The topological structure uniting these resonant converters - and the rectangular-wave (PWM) converters on which they are based - leads to general models of their ...

An AC-DC converter based on a parallel drive of two piezoelectric ceramic transformers was investigated. The transformers operate in a fundamental contour extensional vibration mode which has a large electromechanical coupling factor notwithstanding the use of a piezoelectric transversal effect. The converter includes Al electrolytic ...

Conventional ac-dc converters present two important disadvantages: they create harmonic currents and require reactive power. To reduce these drawbacks, a diode rectifier is directly connected in series with a chopper controlled by pulsewidth modulation. Both are preceded by a series inductance (added to the equivalent one of the power system) and a shunt ...

while maintaining a constant voltage across the dc link capacitors. For positive ac line voltage vs-phase half-bridge UPS inverters. A traditional half-bridge converter and two recently introduced ac on the switches, and capability of voltage balance control of the dc bus capacitors. Analytical ...

The design and testing of a 400 watt, dual phase, dual rotor, field modulated inductor alternator is described. The system is designed for use as a flywheel to ac utility line or flywheel to dc bus (electric vehicle) power converter. The machine is unique...

For the transfer of alternating voltage and current to the equivalent direct units, Multijunction Thermal Converters (MJTC's) have been developed, the uncertainty of which are in the range of the uncertainty of the maintenance of the electrical units. A n...

�DC Micro-grid� is a novel power system using dc distribution in order to provide super high quality electric power. The power is distributed through dc distribution line and converted to required ac or dc voltages by converters placed near loads. ...

This project proposes to design and develop a new class of power converters (direct DC to AC) to drastically improve performance and optimize the cost, size, weight and volume of the DC to AC converter in SOFC systems. The proposed topologies employ a high frequency link; ...

A ferroresonant flux coupled battery is described comprising: (a) first rectifier means adapted to be connected to the AC source for providing a DC output voltage; (b) high-frequency converter means having an input connected to the first rectifier means, and an output, the high-frequency converter means being ...

The paper describes briefly the following components of hydrogen-electric power drives: chilled hydrogen gas tank, liquid oxygen tank, fuel cell bank, dc/ac converter, ac drive motors, solid-state ac speed control, dc sputter-ion vacuum pumps, steam turbine generator, and steam condenser. Uses ...

Interfacing a photovoltaic system with an ac distribution network, requires a dc to ac converter, sometimes called an inverter. Discussed are the two generic inverter types, how they behave at the ac interface, what one may expect from them in terms of performance, and what can be done to ...

A power factor analysis of the input part of an advanced AC/DC/AC converter for variable speed wind turbines is presented. Two types of rectifying input converters are compared: the boost rectifier, consisting of three AC inductors, a three-phase diode br...

As ac/dc systems become further integrated, multiple-infeed converter (MIC) systems can be expected to become more common. In this paper, different categories of MIC systems are defined, and the impact of the ac system strength and the coordination of reactive power demand of the converters on the dynamic ...

for converting vibrations to electricity include variable capacitor #12;generators, electromagnetic generators, producing an AC current � Power conditioning circuitry which converts the AC signal from the generator for our design. Piezoelectric bimorph generator Power conditioning circuitry ...

This is volume 2 of the proceedings of the IEEE International Conference on Power Electronics, Drives and Energy Systems for Industrial Growth held during January 1996, in New Delhi, India. The topics of this volume include AC/DC and AC/AC converters, induction generators, traction and electric vehicle drives, application of neural ...

This text on DC power transmission includes information on the development and use of DC systems, operation of equipment such as converters and capacitors in transmission circuits, the stability of DC systems and the influence of such systems on the stability of associated AC systems, and ...

Each of the twelve Booster Main Magnet Power Supply modules consist of two three-phase, full-wave rectifier bridges in series to provide a 560 VDC maximum output. The harmonic contents of the twelve-pulse ac-dc converter output are multiples of the 60 Hz ac power input, with a predominant 720 Hz signal greater than 14 dB in magnitude ...

... DC TO DC CONVERTERS, HIGH TEMPERATURE, EFFICIENCY, RELIABILITY, DIRECT CURRENT, ELECTRICAL EQUIPMENT, CONVERTERS ...

The use of a thin film or a planar multijunction thermal converter (PMJTC) for the ac-dc transfer of voltage and current is well established. In general, a three dimensional multijunction thermal converter (MJTC) has the advantage of accuracy and a single junction thermal converter (SJTC) has that of low cost. ...

Considerable incentives exist for utilities to place hvdc transmission lines along the same right of way as ac lines. One consequence of such an application is steady state induction of fundamental frequency voltages into the dc circuit. The resulting current ripple on the dc converter can cause continuous offset ...

The Gemini Synchronous inverter is a solid state device that, when interposed between a variable-voltage DC power source and an AC power grid, converts the DC to AC at standard line voltages and frequencies. If more power is available from the DC source than is required by ...

Deblock of AC-DC interconnected system with externally commutated converters generally adopts soft start which makes trigger delay angle about 90 degrees and starts DC voltage from about 0kV. High DC voltage, however, is possibly caused by relation between the deblock signal and AC voltage ...

Abstract�A new family of ac�dc converters is derived which integrate the functions of low-harmonic rectification, low-frequency energy storage, and wide-bandwidth output voltage control into a single converter containing one, two, or four active switches. These converters utilize a discontinuous conduction mode ...

"This is an educational module dedicated to basic power electronic circuits. The module includes DC/DC converters, basic diode and thyristor converter systems, AC/DC inverter, space vector modulation and basic signal theory. In the future there will be minor changes (mainly additions and corrections). The material ...

A switching frequency multiplier inverter for low inductance machines that uses parallel connection of switches and each switch is independently controlled according to a pulse width modulation scheme. The effective switching frequency is multiplied by the number of switches connected in parallel while each individual switch operates within its limit of switching frequency. This technique can also ...

The analysis and design of nearly unity power-factor and fast dynamic response of the modular three-phase ac to dc converter using three single-phase isolated SEPIC rectifier modules with minimized dc bus capacitor is discussed, based on power balance control technique. The averaged small-signal technique is used ...

An inductor-converter bridge (ICB) is a solid state DC-AC-DC power converter system for bidirectional, controllable, energy transfer between two coils. The ICB is suitable for supplying large pulsed power to such magnets as the superconducting equilibrium field coil of the proposed tokamak power reactors from another superconducting ...

DC-DC Converter Portal. Guide to Designers and EEE Part Engineers for the. Application of DC-DC Converters in Space Systems. This portal is published and ...

A systematic and straightforward procedure is developed for the synthesis and analysis of dc-to-three-phase-ac switched-mode converters. The procedure is useful in the derivation and design of converters with desirable characteristics such as harmonic-free power processing and low component stresses. Application of this procedure to a ...

The reader is informed of what was done for the mathematical modeling of the dc-ac inverter for the Space Shuttle. The mathematical modeling of the dc-ac inverter is an essential element in the modeling of the electrical power distribution system of the Space Shuttle. The electrical power distribution system which is present on the Space Shuttle is made up ...

The objective of this study is to develop a parallel ac-ac converter that can be implemented as a means of connecting ac generators in parallel. The most important goal of the parallel converter in this study is to obtain equal current sharing performance among the paralleled generators such that an economically ...

A new quasi current resonant dc link (QCRDCL) topology has been developed in this paper. Although prototype current resonant dc link topologies for ac/ac power conversion have had such problems as irregular high current peaks, uncontrollable pulse width, etc., this new topology enables the ac/ac conversion system ...

amplifier, DC-DC convert- ers and high performance AC, DC and step-motor control appli- cations. Many+. Capacitor, C1, integrates in a direction to satisfy the reference current signal at IN. The IN- input will be a function of the amount of dc hysteresis gain, R3/R1 and the size of capacitor, ...

Significant advances in modern ac/ac power converter technologies and demands of industries have reached beyond standard ac/ac power converters with voltage-source inverters fed from diode rectifiers. Power electronics converters have been matured to stages toward compact realization, increased ...

A new topology for utility interactive dc-ac inverters was explored. The approach is limited to the single phase, 2 to 10 kW power levels typical of residential photovoltaic applications. The approach combines two of the three basic inverter operations, waveshaping and regulation, in a single dc-dc converter stage. The output of this ...

This paper describes a frequency model for AC-DC converters that can operate either under balanced or imbalanced conditions.The model is an improvement on the usual current injection and is less complex than the existing harmonic load flow techniques. The technique used in this paper allows converter to be described in much more detail ...

This paper proposes a novel control method based on the virtual AC/DC/AC conversion for the matrix converter. The virtual AC/DC/AC conversion method is a very simple strategy to control the input current and the output voltage for the matrix converter. There are two new topics proposed in this paper. Firstly, this ...

A superconduction power storage apparatus includes a superconduction coil for storage and release of electrical energy, and a separately excited thyristor conversion unit having d.c. terminals connected to the said superconduction coil and a.c. terminals connected to an a.c. power source. The conversion unit is arranged so as to ...

ehv dc has come into prominence in recent years as a possible economical means of bulk power transmission. Present systems, such as the proposed Pacific Northwest Southwest Intertie, consist of two converter terminals interconnected by a dc transmission line. The source terminal rectifies power from the ac system ...

The use of high power converters has increased tremendously. Increased demand for transportation, housing and industrial needs means that more number of power converters interact with the utility power grid. These converters are non-linear and they draw harmonic currents, significantly affecting power quality. To reduce harmonics, ...

Direct AC/AC converters have been studied due to their potential use in power converters with no DC-link capacitor, which can contribute to the miniaturization of power converters. However, the absence of a DC-link capacitor makes it difficult to control the ...

AC/DC adapters mostly employ two-stage topology: Power Factor Correction (PFC) pre-regulation stage followed by an isolated DC/DC converter stage. Low power AC/DC adapters require a small size to be competitive. Among their components, the bulk DC-link capacitor is one of the largest because it ...

The work proposes a DC-AC resonant topology intended to high power levels. Using an input current fed resonant inverter to generate high frequency resonant voltage, and a single phase output cycloconverter to modulate and control the voltage, one obtains ...

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 ...

The integrator and D.C. to A.C. converter circuit for processing periodic D.C. pulses to provide an A.C. signal is utilized in the guidance control of acoustic homing torpedoes of the echo-ranging type. The circuit operates at very-low pulse repetition fr...

A semiautomatic ac/dc difference calibration system is described. The system operates over a frequency range of 20 Hz to 100 kHz, covering the voltage range from 0.5 V to 1 kV. For all voltages at frequencies in the range from 20 Hz to 20 kHz, the total u...

This paper presents the preliminary design of poloidal field power supply system of HT-7U super-conducting tokamak. With an emphasis on AC/DC power converter, DC circuit breaker, quench protection, harmonic suppression and static var. compensation, and AC power system, the design principle and features are ...

The final report concludes that the two most likely long-range candidates for converting dc to ac power from batteries and fuel cells are the basic current-fed line commutated inverter (a derivative of HVDC technology), and the voltage-fed conduction angl...