Pulse-width modulation (PWM)or duty-cycle variation methodsare commonly used in speedcontrol of DC motors. The duty cycleis defined as the percentage of digital‘high’ to digital ‘low’ plus digital ‘high’pulse-width during a PWM period.Fig. 1 shows the 5V pulses with 0%through 50% duty cycle.The average DC voltage value for0% duty cycle is zero; with 25% dutycycle the average value is 1.25V (25%of 5V). With 50% duty cycle the averagevalue is 2.5V, and if the duty cycleis 75%, the average voltage is 3.75Vand so on. The ....etc

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: RADHIKA U.K(42)
: REMYA JOHNY(44)
: SANGEETHA THOMAS(46)
: SUBIN P SUNNY(54)

CONTENTS

INTRODUCTION
OBJECTIVE
BLOCK DIAGRAM
CIRCUIT DIAGRAM
WORKING
COMPARITIVE STUDY OF CIRCUIT WITH AND WITHOUT PWM
FEATURES
ADVANTAGES AND DISADVANTAGES OF LED
COMPARISON OF LED LAMPS WITH OTHER LIGHTING TECHNOLOGIES
CONCLUSION
FUTURE SCOPE
REFERENCES

INTRODUCTION
Growing demand for th ....etc

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Presented By:
C. K. Sao, P. W. Lehn, M. R. Iravani, and J. A. Martinez
Abstract”
A benchmark system for studying the sinusoidal pulse-width-modulated distribution-static synchronous compensator (D-STATCOM) is proposed. A simple multifunction controller is provided to offer dc bus voltage control, power factor correction, and ac voltage control. Simulation results are presented and compared to experimental results obtained from a 10-kVA laboratory D-STATCOM. Excellent agreement between simulation and experimental results is obt ....etc

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Pulse Width Modulation


Introduction
The explanation of this issue is applied to the following conditions:
• Application MCU: 3803H Group (e.g. M38039FFHHP)
• Oscillation Frequency: 8 MHz


Description of module used

Figure 1 shows a block diagram of PWM module. In this sample task, the following features are used:
• Automatic generation of PWM output by hardware, without software intervention.
• Period and duty cycle of PWM output ca ....etc

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PRESENTATION
ON
Modeling and Simulation of Space Vector Pulse Width Modulation (SVPWM) Scheme for Inverter Using MATLAB/SIMULINK

Under the Guidance of:
Krishna Kumar Gupta
I Sem. PhD

Presented by:
Sch. No. 093113101
Dr. Shailendra Jain
Associate Professor

content

Review of Theory of Space Vector Pulse Width Modulation (SVPWM) Technique
Steps to Realize SVPWM
MATLAB/Simulink Model
Details of Various Blocks
Results and Comparisons
Conclusions
Reference ....etc

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Sir/Madam
Can i get the information regarding the above mentioned project topic. ....etc

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Introduction to Pulse Width Modulation (PWM)
In this technique several pulses are produced in each half – cycle but the width of the pulses
is not the same as in case of multiple – pulse width modulation, however the width of each pulse is
varied in accordance with the amplitude of the sine wave reference voltage. The width of the pulse
at the center of the half – cycle is maximum and decreases on either side. The figure 6(a) shows the
generation of the output signal by comparing a sinusoidal reference sign ....etc

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1. INTRODUCTION
Pulse Width Modulation (PWM) technique is an effective way of controlling the speed of induction motor, and thus allowing the motor to be applied in the area requiring speed control. Available techniques to control the speed of induction motor are: varying the slip by changing rotor resistance or terminal voltage and varying synchronous speed by changing number of poles or supply frequency. Changing rotor resistance requires wound-rotor induction motor and any resistances inserted to the rotor circu ....etc

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Abstract:
During a long time, permanent magnet synchronous motor (PMSM) were only reserved for some
specific applications, however, recently, these machines are becoming more used due to the powerful magnetic
characteristic of the rare earth, being used in different areas. Recently several researchers have proposed
implementations combining the use of permanent magnet synchronous motor with the direct torque control (DTC)
technique offering a quick and precise control. The present work combines these techniques and it proposes th ....etc

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ABSTRACT
This paper focused on the development of capacitor voltage
balancing methods in a flying capacitor multilevel inverter
(FCMLI) fed induction motor drive. For improving the
performance of flying capacitor multilevel inverter, a switching
pattern selection scheme is implemented. The proposed method
has been designed a seven-level flying capacitor multilevel
inverter by using sinusoidal pulse width modulation technique.
The selected pattern has been exposed to give superior
performance in load voltage, total harmonics dist ....etc

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