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About 10,000 papers for “Pulse-width modulation”

Pulse-Width Modulation Regulators

A. Penin · Power systems · 2016

In the present chapter, the results of Chap. 10 are developed for power supply systems with PWM boost and buck–boost converters. Regime parameters of converter are determined relatively to the maximum permissible load voltage and the control pulse width. Regime change and correspondence between various regime parameters are examined as projective transformations, which makes possible to validate the regime definition, to restrict the range of their variation on the forward branch of regulation curve, and to realize the linearization of this regulation characteristic.

Cited by 0Open access

PULSE WIDTH MODULATION INVERTER

Sandro Kulaš · Repository of the University of Rijeka · 2018

Tema ovog završnog rada je teoretska obrada širinsko-impulsno moduliranog energetskog izmjenjivača. Naziv sklopa u stranoj literaturi može se pronaći kao Pulse Width Modulated Inverter. Pored teoretske obrade osnovnih komponenti sklopa, načina rada i karakteristika sklopa, izrađen je i funkcionalni sklop za praktičnu primjenu. Osnovna funkcija energetskog izmjenjivača je konverzija istosmjernog napona dobivenog iz akumulatora, u izmjenični napon odnosno sinusoidnu struju. Sadržaj rada podijeljen je u dva dijela. U prvom dijelu pružena su potrebna teoretska znanja za razumijevanje načina rada sklopa, stečena kroz akademsko školovanje te samostalno istraživanje strane literature. Pored kratkog povijesnog pregleda razvoja poluvodičkih komponenti, objašnjeni su osnovni dijelovi energetskog izmjenjivača koji čine energetski i upravljački poluvodički ventili, topologija samog izmjenjivača, mikrokontroler korišten za upravljanje poluvodičkim ventilima s primijenjenim algoritmom upravljanja te harmonička izobličenja kao posljedica rada nelinearnih komponenti. U drugom dijelu dokumentiran je proces izrade sklopa uz prikaz potrebnih proračuna prilikom projektiranja sklopa te izvedenih mjerenja za potrebe analize ispravnosti sklopa. Kao izvor napajanja korišten je akumulator kao izvor konstantnog napona iznosa UDC=12V s ciljem generiranja izmjeničnog napona iznosa UAC=230V. Obzirom da je osnovna namjena sklopa predviđena za napajanje trošila manje snage, sklop je dimenzioniran za uporabu u prijevoznom vozilu te sukladno tome njegova snaga je ograničena na S=100VA. U slučaju potrebe za napajanjem trošila većih snaga, uz relativno malo izmjena na sklopu, ograničenje po snazi se jednostavno otklanja.

Cited by 0

Adaptive Pulse Width Modulation

CURTI, Fabio, ASCANI, Livio, PARISSE, Maurizio · IRIS Research product catalog (Sapienza University of Rome) · 2004

Many spacecraft attitude control systems use actuators that operate in an on-off mode; typical examples are the jet thrusters, for which the control amplitude cannot be modulated. Moreover, if we want to reduce the complexity of the devices that drive the actuators, as for example in the case of magnetic coils, the on-off input is the simplest signal to be generated. The control strategy presented in this paper consists of pulse-modulation control according to an adaptive model reference control law that minimizes a cost function. The cost function is a suitable Liapunov function, which takes into account the state and control variables of the controlled and reference systems. Such a control strategy was numerically tested on a momentum-bias spacecraft in the presence of environmental disturbances.

Cited by 0

Pulse-Width Modulation Regulators

A. Penin · Power systems · 2019

In the present chapter, the results of Chap. 10 are developed for power supplyPower supply systems with $$PWM$$ boost and buck–boost convertersBoost converter. Regime parameters of converter are determined relatively to the maximum permissible load voltage and the control pulse width. Regime changeRegime change and correspondence between various regime parameters are examined as projective transformationsProjective transformation. That makes possible to validate the regime definition, to restrict the range of their variation on the forward branch of regulation curveNon-linear regulation curve, to realize the linearizationLinearization of this regulation characteristicRegulation characteristic, and to get the feedforward control.

Cited by 0Open access

Episode 1.4 – Pulse Width Modulation

David Tarnoff · Digital Commons - East Tennessee State University (East Tennessee State University) · 2020

In this episode, we show how a binary signal can be used to give the appearance of an analog output. We then use this understanding to show how to dim an LED on the Arduino open source platform.

Cited by 0

Bipolar Pulse Width Modulation Inverter

Xin Chen, Ryan Harada · DigitalCommons - CalPoly (California State Polytechnic University) · 2014

The project entails the design of an improved PWM inverter circuit for the inverter lab experiment in the introductory power electronic course. The improved PWM inverter uses bipolar switching with a half bridge control circuit. The inverter utilizes two ICL8038 chip to generate both the control and carrier signals. The improved inverter enhances the system's portability, protection and is easy to understand from the prior design. The improved PWM inverter provides AC variable single phase 65 Hz AC output voltage from DC input signal. The finished product will be used specifically in the EE 410 laboratory course.

Cited by 1Open access

MIDI pulse width modulation application

Slovák, Dalibor · Repository of TBU publications (Univerzita Tomase Bati ze Zline) · 2011

Article describes simulation application for automatic managing lights devices on the stage. There are described all technologies and protocols necessary for application development. MIDI messages are input information and as an output serves Pulse width modulation. A managing tension is the result of Pulse width modulation. A managing tension directs electrical devices via transformation interfaces. The application is intended for users who use the MIDI protocol as part of a live audio and audio-visual production.

Cited by 0

Space Vector Pulse Width Modulation

Avinash Mishra, Swaraj Save, Rohit Sen · 2014

Abstract — The rapid development of high switching frequency power electronics in the past decade leads towards wider application of voltage source inverters in AC power generation. Therefore, this prompts the need for a modulation technique with less total harmonic distortion (THD) and fewer switching losses. Space vector pulse width modulation (SVPWM) provides a better technique compared to the more commonly used PWM or sinusoidal PWM (SPWM) techniques. SVPWM is a more sophisticated technique for generating a fundamental sine wave that provides a higher voltage, high reduction in the dominant harmonics and lower total harmonic distortion when used in an inverter. In SVPWM the complex reference voltage phasor is processed as a whole, therefore, interaction between three phases is exploited, and this strategy reduces the switching losses by limiting the switching. This paper will analyze the working and design of SVPWM and will provide comparative analysis of improved quality with the conventional methods. Index Terms — space vector pwm, space vector, pulse width modulation.

Cited by 0

Distortionless RF pulse width modulation

P. Wagh, P. Midya, P. Rakers · 2003

A method is presented to synthesize a switching signal which linearly encodes a complex-modulated RF signal to an RF carrier frequency. The switching distortion associated with this method is limited to high-pass components out of band. Consequently, the switching signal may be filtered after high efficiency amplification to produce the linear RF modulation. The method requires a switching frequency slightly higher than the highest frequency in the band of interest.

Cited by 5

Multiphase Space Vector Pulse Width Modulation

John W. Kelly, Elias G. Strangas, John M. Miller · IEEE Power Engineering Review · 2002

Pole-phase modulation adjusts the pole-phase ratio of an induction machine and requires a multileg, multiphase inverter. This paper analyzes an n-leg n-phase inverter and presents techniques for n-phase space vector pulse width modulation (SVPWM). In particular, nine-phase SVPWM is developed and implemented on a nine-winding induction machine. The nine-phase SVPWM is compared to nine-phase sine-triangle PWM in terms of dc bus utilization.

Cited by 113

Square wave Pulse Width Modulation (SWPWM),

Hadi Farshbar, Murteza Farsadi · 2014

Multilevel inverters have become more popular over the years in electric high power application with the promise of less disturbances and the possibility to function at lower switching frequencies than ordinary two-level inverters. Multilevel inverters has been introduced as static high-power inverters for medium to high voltage applications such as large electric drives, reactive power compensations, dynamic voltage restorers and FACTS devices. Different Pulse Width Modulation (PWM) strategies have been used in multilevel inverter topologies. In this

Cited by 0