• Study Resource
  • Explore Categories
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
EMC filters 3-phase dv/dt output reactors 520 V AC, 8 1500 A, 40
EMC filters 3-phase dv/dt output reactors 520 V AC, 8 1500 A, 40

... 1. Some parts of this publication contain statements about the suitability of our products for certain areas of application. These statements are based on our knowledge of typical requirements that are often placed on our products in the areas of application concerned. We nevertheless expressly poin ...
Low-Dropout Regulator with modest ripple and rugged performance
Low-Dropout Regulator with modest ripple and rugged performance

R.P. Pilawa-Podgurski, W. Li, I. Celanovic and D.J. Perreault, “Integrated CMOS Energy Harvesting Converter with Digital Maximum Power Point Tracking for a Portable Thermophotovoltaic Power Generator,” IEEE Journal of Emerging and Selected Topics in Power Electronics , Vol. 3, No. 4, pp. 1021-1035, August 2015.
R.P. Pilawa-Podgurski, W. Li, I. Celanovic and D.J. Perreault, “Integrated CMOS Energy Harvesting Converter with Digital Maximum Power Point Tracking for a Portable Thermophotovoltaic Power Generator,” IEEE Journal of Emerging and Selected Topics in Power Electronics , Vol. 3, No. 4, pp. 1021-1035, August 2015.

... (increase or decrease), and observe whether the delivered power increased or decreased due to this perturbation. If the power increased, the controller continues to perturb the duty cycle in the same direction, but if the power decreased, the direction of the perturbation is changed. With this metho ...
WAVEFORM GENERATOR 7075
WAVEFORM GENERATOR 7075

... waveforms such as sine and square waves. Basic capabilities of the custom waveform generator include long-duration, high-quality waveform output from a 128,000-word memory, 10 MHz clock rate and 16-bit resolution. The function generator and arbitrary waveform output functions can be swept according ...
Simple calibration for ceramic sensing elements using an ME651
Simple calibration for ceramic sensing elements using an ME651

... This discrepancy is accounted for in the calibration procedure described in the following by correcting the discrete adjusting resistors. The obtained zero point value UFP1 is corrected to the target value of UFP2 = 0.5V by trimming resistor R3 (e.g. potentiometer). As the zero point- and full-scale ...
low harmonic drive packages engineered for you.
low harmonic drive packages engineered for you.

... By applying the appropriate technology, the effects of harmonics can be reduced, thereby minimizing the effects of potential damage to your assets. Rockwell Automation® offers a variety of low and medium voltage VFD options in small-foot print packages, engineered to minimize harmonic distortion at ...
Boost Converter Design
Boost Converter Design

Implementation of a Micro Power 15-bit`Floating
Implementation of a Micro Power 15-bit`Floating

INA138-Q1, INA168-Q1
INA138-Q1, INA168-Q1

... Quiescent current is only 25 μA, which permits connecting the power supply to either side of the current-measurement shunt with minimal error. The device converts a differential input voltage to a current output. This current is converted back to a voltage with an external load resistor that sets an ...
MC1455 - Timers
MC1455 - Timers

... are used for the timing network. Both the threshold terminal and the discharge transistor terminal are connected together in this mode (refer to circuit in Figure 14). When the input voltage to the trigger comparator falls below 1/3 VCC, the comparator output triggers the flip−flop so that its outpu ...
Application specific low power alu design
Application specific low power alu design

... In application specific designs, the frequency of a functional component is obtained from instruction frequencies. We can therefore partition the instruction set into ALU and non-ALU instructions. The ALU instructions can then be grouped according to the functional component they actually use. Diffe ...
Coded Signals
Coded Signals

... • Envelope (amplitude over time) can be programmed ...
The Ten Things You Need To Know About Power Inverters
The Ten Things You Need To Know About Power Inverters

Signal Processing for Single Transducer Distance Measurement
Signal Processing for Single Transducer Distance Measurement

... increase the reliability of the model parameters for small reflector distances is averaging of several measurements with different reflector positions [5]. After the model parameter estimation the electrical received signal can be calculated as the difference of the measured transducer signal and th ...
Fluke-175, Fluke-177, Fluke-179
Fluke-175, Fluke-177, Fluke-179

... Versatile meters for maintenance, field service and bench repair. The 170 Series have the features needed to find most electrical, electronic, electro-mechanical and heating and ventilation problems. They are simple to use and have significant improvements over Fluke’s original 70 Series like true-r ...
MX60 Manual Rev 3.qxd
MX60 Manual Rev 3.qxd

Fundamental Characteristics of Thyristors
Fundamental Characteristics of Thyristors

... DIACs used in typical phase control circuits are basically protected against excessive current at breakover as long as the firing capacitor is not excessively large. When DIACs are used in a zener function, current limiting is necessary. ...
Reduction of crosstalk on printed circuit board using genetic
Reduction of crosstalk on printed circuit board using genetic

... reduce dv=dt and di=dt, some use resonant circuits with a quasi-sinusoidal waveform instead of a rectangular waveform. Some use random pulsewidth modulation (PWM) to average out the EMI spectrum so produced. Others use filters to filter out noise. Design guidelines are produced which advise minimiza ...
Data Sheet
Data Sheet

... Higher quality load cells cancel out the effects of temperature using two techniques. By matching the expansion rate of the strain gauge to the expansion rate of the metal it’s mounted on, undue strain on the gauges can be avoided as the load cell warms up and cools down. The most important method o ...
HTRI-S-D-R - Fire Alarm Resources
HTRI-S-D-R - Fire Alarm Resources

... 1. There can be any number of normally closed or normally open switches. 2. The end of line resistor must be located at the last switch. 3. Do not wire a normally closed switch across the end of line resistor. 4. Only for use with security and status applications. 5. Do not use N.O. switches for sec ...
AGATA Hybrid Preamplifiers with Pulser, Draft Version 1.4
AGATA Hybrid Preamplifiers with Pulser, Draft Version 1.4

... in a 16-bit word format, via a 3-wire industry_standard serial interface ( CS, Clock, Data_In ) The structure of Chopper_Pulser stage is shown in Fig. 8. ...
ADM3101E 3.3 V, Single Channel RS-232 Line Driver
ADM3101E 3.3 V, Single Channel RS-232 Line Driver

... ADM3101E’s I/O pins. Emissions are also controlled to within very strict limits. CMOS technology is used to keep the power dissipation to an absolute minimum, allowing maximum battery life in portable applications. Four external 0.1 µF charge pump capacitors are used for the voltage doubler/inverter ...
MAX1873 Simple Current-Limited Switch-Mode Li+ Charger Controller General Description
MAX1873 Simple Current-Limited Switch-Mode Li+ Charger Controller General Description

... The MAX1873 includes all of the functions necessary to charge 2-, 3-, or 4-series cell lithium-ion (Li+) battery packs. It includes a high-efficiency step-down DC-DC converter that controls charging voltage and current. It also features input source current limiting so that an AC adapter that suppli ...
OPA656 - Texas Instruments
OPA656 - Texas Instruments

... Test and Measurement Front Ends ...
PRT-SERV-1.2 Eight Channel Servo Expansion Board
PRT-SERV-1.2 Eight Channel Servo Expansion Board

... OUT, RST, Mode, COM: Leave unconnected. These pins are not used. ...
< 1 ... 470 471 472 473 474 475 476 477 478 ... 1202 >

Pulse-width modulation



Pulse-width modulation (PWM), or pulse-duration modulation (PDM), is a modulation technique used to encode a message into a pulsing signal. Although this modulation technique can be used to encode information for transmission, its main use is to allow the control of the power supplied to electrical devices, especially to inertial loads such as motors. In addition, PWM is one of the two principal algorithms used in photovoltaic solar battery chargers, the other being MPPT.The average value of voltage (and current) fed to the load is controlled by turning the switch between supply and load on and off at a fast rate. The longer the switch is on compared to the off periods, the higher the total power supplied to the load.The PWM switching frequency has to be much higher than what would affect the load (the device that uses the power), which is to say that the resultant waveform perceived by the load must be as smooth as possible. Typically switching has to be done several times a minute in an electric stove, 120 Hz in a lamp dimmer, from few kilohertz (kHz) to tens of kHz for a motor drive and well into the tens or hundreds of kHz in audio amplifiers and computer power supplies.The term duty cycle describes the proportion of 'on' time to the regular interval or 'period' of time; a low duty cycle corresponds to low power, because the power is off for most of the time. Duty cycle is expressed in percent, 100% being fully on.The main advantage of PWM is that power loss in the switching devices is very low. When a switch is off there is practically no current, and when it is on and power is being transferred to the load, there is almost no voltage drop across the switch. Power loss, being the product of voltage and current, is thus in both cases close to zero. PWM also works well with digital controls, which, because of their on/off nature, can easily set the needed duty cycle.PWM has also been used in certain communication systems where its duty cycle has been used to convey information over a communications channel.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report