This patent describes an energy management circuit comprising: a laser; an AC input with a maximum power level; a DC source of energy operating in conjunction with the AC input and functioning to provide supplementary power as needed for operation of the laser, when the ...

Efficient, light-weight power conditioning equipment was investigated in the area of AC to AC transformation, where AC of a variable frequency is to be transformed efficiently into AC of a fixed frequency at a significant power level. This task, which fol...

... Accession Number : AD0727748. Title : AC Power System Evaluation Variable Frequency Input - Constant Frequency Output. ...

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 AC output voltage.

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

was remember the soldier, it must be set and forget. The systems can operate on a wide range of power sources; AC inputs from 60 to 400 Hz and DC inputs of ...

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...

LC filters are connected both input and output side of the AC chopper circuit in order to remove the switching ripple and harmonics. Characteristics of THD and input-power-factor are examined by simulation and experiments. When the load is resistive, characteristics are little influenced by the filters. In case of the inductive load, ...

...powered, it must comply with the AC line conducted requirements found in § 15.207. AC or DC power lines and data input/output lines connected to the module must not contain ferrites, unless they will be marketed with the module...

A modular, low weight impedance dropping power supply with battery backup is disclosed that can be connected to a high voltage AC source and provide electrical power at a lower voltage. The design can be scaled over a wide range of input voltages and over a wide range of output voltages and delivered ...

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 ...

... 60Hz ac filament voltage and all coolant flows) measurements of the input and output ... up to 1000Hz for at least 90 db below the full power output of ...

... of the present invention allows for the single phase output to be mated to the dummy load without the need of removing input power to the AC ...

An AC uninterruptible power source is disclosed that provides multiphase power output signals for actual use and a selectable single phase power output signal for use in testing. The AC uninterruptible power source further comprises at least one battery. The single phase ...

This paper introduces a new switching mode power supply with the following properties: zero-voltage switching, pulse-width modulation at constant frequency, three-phase input with power factor and low input current distortion, using a simple power stage. ...

This paper presents a technique for modeling and simulating ac spacecraft power systems. Each component in the spacecraft power system is treated as a two-port network. A state model is written for each two-port network with the port voltages as the inputs. Each component state model is solved using the state ...

Existing 34, ac-dc low-harmonic rectiifiers are costly and require complex control schemes to minimize input current harmonics. Introduced here are three new classes of low cost 34, ac-dc high power factorllow harmonic controlled rectifiers. These are derived from parent dc-dc convrter topologies containing ...

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 ...

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 dc output and shaping the input current, from an ac voltage source, without the ...

to produce hydrogen by electrolyzing water � Characterize electrolyzer performance under variable input power Bridge Current Wind-Electrolysis Project AC Source (Wind Turbine) Simulator 10kW Wind Turbine AC-DC Power � Power electronics (PE) regulating voltage � 50A ...

A system is disclosed for storing electrical energy and for converting dc power to ac power. The system includes a very large flywheel which is mounted in an evacuated housing and is driven by a plurality of wheels powered by dc electric motors which receive current from an input ...

This paper designs a switching power with high power factor, which has the standard input 220V AC, and the adjustably output voltage range form DC 30V to 36V, the maximum output current can be to 3A. It designs the main circuit, the PFC control circuit, the measurement circuit, and also calculates the important ...

In this paper, a new single-phase to three-phase converter for low-cost ac motor drive is proposed. The proposed converter employs only six switches and incorporates an active input current shaping feature that results in sinusoidal input current at close to unity power factor. The front-end rectifier in the ...

This patent describes a combination power supply-battery backup power supply-battery charger, comprising: an AC power source, including a transformer means for providing a predetermined AC voltage; a rectification means placed in an AC circuit with the ...

Single-phase and three-phase voltage source converters with variable voltage and constant frequency ac-ac conversion are presented. These converters are a single bridge circuit of two legs for single-phase conversion and of three legs for three-phase, respectively. Both the power source and the load are connected to bridge legs. The normal PWM methods with ...

This paper presents a control scheme of matrix converters for reducing the output voltage harmonics. The proposed control scheme is based on the direct AC/AC conversion approach and the carrier-based PWM control to obtain the constant switching frequency. The proposed scheme can realize the simultaneous control of both the output voltage and the input ...

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 converter/inverter systems. D-PEC can improve the efficiency of a motor drive ...

An AC uninterruptible power source is disclosed that provides multi-phase power output signals for actual use and a selectable single phase power output signal for use in testing. The AC uninterruptible power source further comprises at least one battery. The single phase ...

Sep 3, 2010 ... SUBTOPIC TITLE: Power Management and Storage. PROPOSAL TITLE: Efficient Lightweight AC-AC Power Control for Solar UAV ...

A system for transmitting low frequency analog signals over AC power lines using FM modulation. A low frequency analog signal to be transmitted is first applied to a voltage-to-frequency converter where it is converted to a signal whose frequency varies in proportion to the analog signal amplitude. This signal is then used to modulate the carrier frequency ...

. One such topology is the PWM Current Source Rectifier (PWM CSR), Fig. l(a). Since, in high power index controlfor elimination of two harmonics, (c) typical rectifier input current, I,,,. tern used in this article eliminates the 5th and 7th current harmonics from the rectifier input current

A controller is provided for controlling operation of at least one electrical load operating on an AC supply having a typical frequency, the AC supply being provided via power transformers by an electrical power distribution grid. The controller is associated with the load and comprises an ...

This patent describes an electrical heating power source for a heating system for heating a zone in a subterranean formation, the heating system including the power source, a main electrode positioned in the zone to be heated, at least one sensor in the well for sensing a parameter relating to fluid pressure, fluid temperature, fluid level, fluid flow ...

Seven residential utility-interactive inverters for photovoltaic power systems have been evaluated at MIT Laboratory and at the Northeast Residential Experiment Station (NE RES). Two, a Windworks Gemini and an Abacus Sunverter, have been reported on previously. Reviewed here are five other inverters: Windworks Gemini 8-kW (dc) model with an ac filter to ...

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, and a rectifier (ac�dc) circuit. The ...

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 ...

A new technique is developed to measure the mean junction temperature during ac operation of alternating current light-emitting diodes (ac LEDs). In general, the ac electrical system supplies power at a fixed root-mean-square voltage (Vrms) but the current may vary during operation. The ac LED ...

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 ...

Existing 3{phi} ac-dc low-harmonic rectifiers are costly and require complex control schemes to minimize input current harmonics. Introduced here are two new classes of low cost 3{phi} ac-dc high power factor/low harmonic controlled rectifiers. These are derived from parent dc-dc converter topologies containing ...

Static power conversion systems have traditionally utilized dc current or voltage source links for converting power from one ac or dc form to another, since it readily achieves the temporary energy storage required to decouple the input from the output. S...

methods divided into buck-like and boost-like techniques. ... In switched-mode power conversion, a high quality output voltage is usually of .... shaper," draws power from the single-phase power source and supplies constant ...... [11] M.F. Schlecht, "Novel Topological Alternatives to the Design of a Harmonic-Free ...

Converter Based Rectifier With Sinusoidal Inputs and Unity Power Factor for Medium Voltage (4160�7200 V Abstract--A novel rectifier topology for high power (0.5 to 10 MVA) current source based ac motor drives is proposed. This rec- tifier is composed of a multi-winding transformer, a multi-level diode rectifier

The invention discloses an apparatus for direct current to alternating current power conversion by means of progressive variation of magnetic flux in associated magnetic paths. A direct current input is subdivided into power pulses in two permeance controlled transformers. The pulses are modified, stabilized and recombined in phase ...

In this lecture, we shall discuss some of the major characteristics of dc power supplies and hard-tube pulsers, along with many of their PCS limiting properties and several of the more powerful vacuum tubes that are currently available for larger hard-tube pulsers systems. The initial topic will be elementary dc power supplies, ...

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 ...

A thyristor-based inverter/charger for use in electric passenger vehicles is described, and prototype charger test results are presented. A battery charger is included integral to the inverter by using a subset of the inverter power circuit components. The integral charger employs the inverter commutation components as a resonant ac/dc converter rated at ...

Page 1. EFFECT OF AC POWER ON EBW DETONATORS Allan H. Herrbach ... 4. TITLE AND SUBTITLE Effect of AC Power on EBW Detonators 5a. ...

Variable frequency drives typically have employed dc voltage or current links for power distribution between the input and output converters and as a means to temporarily store energy. The dc link based power conversion systems have several inherent limitations. One of the important limitations is the high switching loss and high ...

... System A custom designed AC nulling circuit will supplied in order to cancel AC flux from the AC magnet that is coupled into the input circuits. ...

... to measure the total power input, and the power input due to ... heat content obtained earlier in this study, the individual power inputs were determined ...

Power harvesting refers to the practice of acquiring energy from the environment which would be otherwise wasted and converting it into usable electric energy. Much work has been done on studying the optimal AC power output, while little has considered the AC-DC output. This article investigates the optimal ...

The 30 MJ, 10 MW superconducting magnetic energy storage (SMES) system was devised to interact in the Western U.S. Power System as an alternate means to damp unstable oscillations at 0.35 Hz on the Pacific HVAC Intertie. The SMES unit was installed at the Tacoma Substation of the Bonneville Power Administration (BPA). The operating limits of the 30 MJ SMES ...

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 ...

Time quantity one-cycle control method is proposed in this paper for unity power-factor ac-dc converters. Converters controlled by this method operate at constant switching frequency, require no current sensing, have a simple control circuit, and exhibit resistive input impedance at the ac side. Feedback loop ...

Methods of powering devices to which only ac contact can be made and receiving data transmitted back from them are described. Such devices include medical implants which communicate with the external environment via ultrasound or rf links. Two breadboard systems were built to demonstrate the techniques. In both the device is powered by ...

This patent describes a power converter for converting alternating line current provided at an input to direct current delivered at an output of the power converter. It comprises: filtering means for filtering the input alternating line current, rectifying means responsive to the input current ...

This paper describes a single-phase, series-resonant inverter which injects a sinusoidal current into a load while a standard AC utility source is connected to the load and which can be used in photovoltaic applications. At moderate power levels the inverter requires DC input in the kilovolt range but will operate over a wide ...

A drive train for an electric vehicle includes a traction battery, a power drive circuit, a main contactor for connecting and disconnecting the traction battery and the power drive circuit, a voltage detector across contacts of the main contactor, and a controller for controlling the main contactor to prevent movement of its contacts to the closed position ...

A drive train for an electric vehicle includes a traction battery, a power drive circuit, a main contactor for connecting and disconnecting the traction battery and the power drive circuit, a voltage detector across contacts of the main contactor, and a controller for controlling the main contactor to prevent movement of its contacts to the closed position ...

... Introduced by blocking capacitors to the grids of the modulator tubes. With zero dc signal at the Input, no carrier Is transmitted to the input of the ac ...

A method of optimising the arc power in an ac electric arc furnace is given together with the main process parameters that must be monitored in order to achieve a symmetrical arc power input. A new configuration of oxy-fuel burners is described where move...

This citation summarizes a one-page announcement of technology available for utilization. A power processor developed for the U.S. Army Electronics Research and Development Command Delivers 28 volts dc at currents up to 100A from an input of three-phase, ...

...AC-powered magnet. (a) Identification. An AC-powered magnet is an AC-powered device that generates a magnetic field intended to find and remove metallic foreign bodies from eye tissue. (b) Classification. Class...

This paper proposes a novel control method for a direct interface converter for management of the energy flow in either an AC or DC supply. The proposed converter is constructed based on an indirect matrix converter. Therefore a proposed control strategy is based on an indirect control method with a triangular carrier wave. The basic operation of the proposed control method is ...

The series-resonant converter is one of the major classes of electronic power converters that are extensively applied in dc-dc conversion. This technology transfers bulk energy efficiently through a series-resonant circuit in the direct path of the energy transfer. This resonant converter forms a high-frequency ac link between the voltage sources connected ...

Electronic power conditioning equipment used in generating stations and substations faces a hostile electromagnetic environment replete with frequency and voltage excursions, and radio frequency interference. The equipment must be chosen according to the performance expected of it and the conditions that will prevail in its surroundings. Some information on ...

PVWATTS is an Internet-accessible software program that allows the user to easily calculate the energy production and cost savings for grid-connected photovoltaic (PV) systems located throughout the United States. To ensure that PVWATTS continues to meet its users' needs, an online survey form was provided to users to identify areas for improvement. The results of the survey were used to ...

sections: input power section, input section, and output section. The input power section ... converters to power the input and the output sections, inde- ...

Sep 25, 2008 ... Kevin Boyce, HST Systems Engineer, ACS Repair: What failed is a power supply. And in fact, in the ACS there were two power supplies, ...

... 4. TITLE AND SUBTITLE AC COUPLED INTERCONNECT FOR LOW POWER SPACEBORNE ELECTRONICS 5a. ... AC signal I/Os (with TRX) ...

An inverter (34) which provides power to an A.C. machine (28) is controlled by a circuit (36) employing PWM control strategy whereby A.C. power is supplied to the machine at a preselectable frequency and preselectable voltage. This is accomplished by the technique of waveform notching in which the shapes of the ...

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; direct DC to AC conversion approach. The ...

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 ...

Regulation of load voltage in single-phase applications is becoming an important issue for critical loads. This paper proposes a method to regulate a single-phase ac source by using a series-connected auxiliary voltage source. A voltage source inverter, connected in series with the ac supply through a transformer, is used to compensate the ...

A system and method for determining stator winding resistance in an AC motor is disclosed. The system includes a circuit having an input connectable to an AC source and an output connectable to an input terminal of an AC motor. The circuit includes at least one contactor and at least one switch ...

This paper proposes a simple and high efficiency control method for a high-frequency link three-phase AC/AC direct converter. There are three topics in this paper. First, the control strategy of the AC/AC converter is proposed based on a conventional rectifier and inverter system. Thus, the proposed method realizes wide control range and the high ...

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 dc and low-frequency ac behavior. An expression is derived that yields the dc ...

Hard and soft switching test results conducted with one of the samples of first generation MOS-controlled thyristor (MCTs) and similar test results with several different samples of second generation MCT's are reported. A simple chopper circuit is used to investigate the basic switching characteristics of MCT under hard switching and various types of resonant circuits are used to determine soft ...

Based on the Gummel-Poon model of BJT, the change of the DC bias as a function of the AC input signal in RF linear power amplifiers is theoretically derived, so that the linearity of different DC bias circuits can be interpreted and compared. According to the analysis results, a quantitative adaptive DC bias circuit is proposed, which ...

A power controller device which uses a voltage-to-frequency converter in conjunction with a zero crossing detector to linearly and proportionally control AC power being supplied to a load. The output of the voltage to frequency converter controls the reset input of a R-S flip flop, while an 0 crossing detector ...