4.6 NUETRAL POINT CLAMPED (NPC) INVERTERS


Known as three-level inverters

Problem of 2-level inverter in high-power applications
High DC page link voltage requires series connection of devices  difficulty in dynamic voltage sharing during switching

Solved using NPC inverter or multilevel inverter

NPC inverter circuit


NPC (3)

DC page link capacitor split to create neutral point 0

Q11, Q14 : main devices (2-level inverter)

Q12, Q13 : auxiliary devices – clamp output potential to ne ....etc

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ABSTRACT

A new operational mode for diode-clamped multilevel inverters termed quasi two-level operation is proposed. Such operation aims to avoid the imbalance problem of the dc-link capacitors for multilevel inverters with more than three levels and reduces the dc-link capacitance without introducing any significant voltage ripple at the dc-link nodes. The proposed operation can be generalized for any number of levels. The validity of the proposed multilevel inverter operational mo ....etc

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I need to give a seminar on diode clamped multilevel inverters so i would like to know more about it. ....etc

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Introduction

-What is Gunn Diode?
The Gunn diode is used as local oscillator covering the microwave frequency range of 1 to 100GHz
-How Gunn Diode works?
By means of the transferred electron mechanism, it has the negative resistance characteristic
-What’s the applications?
Local Oscillator and Avoid Collision Radar instead of Klystron etc..
-What’s the advantages?
Low noise, High frequency operation and Medium RF Power

Gunn Effect

Gunn effect was discovered by J.B Gu ....etc

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ABSTRACT
Organic light emitting diode (OLED) display technology has been grabbing headlines in recent years. Now one form of OLED displays, LIGHT EMITTING POLYMER (LEP) technology is rapidly emerging as a serious candidate for next generation flat panel displays. LEP technology promises thin, light weight emissive displays with low drive voltage, low power consumption, high contrast, wide viewing angle, and fast switching times.
One of the main attractions of thi ....etc

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Diode Clamped Multilevel Inverter Fed Induction Motor


INTRODUCTION

Two level voltage source inverters produce an output voltage or a current with levels either 0 or ± Vdc

In high power and high voltage application these two level inverters, however, have some limitations in operating at high frequency mainly due to switching losses and constraints of device ratings.

Unique structure of ML-VSIs allow them to reach high voltages with low-harmonics wit ....etc

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Abstract:
Dental Composites to Degraded MLI:


Ben Reed's experience as a materials engineer has led him from the challenges of dental composites to long term space exposure on the Hubble Space Telescope (HST).

Dental composites were developed in the 1960s and have continued to play a major role in restorative dentistry to date. However, they do not exhibit the typical service life of silver amalgam or gold fillings. Much of their lower service life is due to the consequences of polymerization shrinkage.

The Hu ....etc

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Flexible Organic LEDâ„¢s


Presented By: Ryan Evans



What the Flexible Organic Light Emitting Diode Consist of :

The Top Layer is the Cathode layer made of tungsten releases electrons when current is run through it.

Emissive Layer removes electrons from the cathode layer to make light.

Conductive layer is made from a type of organic plastic that removes the electron wholes

Then the Anode Layer that consist of removing and adding electron holes while the current is running through i ....etc

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ZENER DIODE TESTER

ABSTRACT


The testing of zener diodes requires a variable dc power supply. A typical test circuit can be constructed, as shown in figure 4-19. In this circuit, the variable power supply is used to adjust the input voltage to a suitable value for the zener diode being tested. With the zener diode connected no current will flow until the voltage across the diode is equal to the zener ....etc

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need ppt related to diode clamped multilevel inverter
need ppt related to diode clamped multilevel inverter
....etc

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