Design and Implementation of a Single Phase Inverter Circuit Essay Example for Free

Design and Implementation of a Single Phase Inverter Circuit Essay Inverters are used to produce constant or variable frequency AC output from a DC source. These inverters can be used for AC applicatio n like driving an induction motor. Such type of inverters in present world are used largely in renewable energy systems to convert DC to AC, example is a PV system where there is a requirement of such type of inverters which can power AC systems such as an induction motor (IM). It is required to produce a pure sinusoidal waveform for the proper functioning of the IM drive. This can be done by incorporating pulse width modulation (PWM) techniques. Technique used in generating a Pulse width modulation is that of the comparison of reference signal which is a sinusoidal waveform as required at the output and a triangular or carrier signal of high frequency. The next section (Section 2) will give a brief detail about the power switches used in the inverters. Section 3 gives the study in detai l of single phase half wave and full wave bridge. In section 4 a detailed discussion about PWM technique is done. This section  also gives the circuit diagram required to generate the PWM using microcontroller. Section 5 shows the development of the swit ching control in details starting from the opto-coupler to the derive circuit. The bootstrap circuit is detailed in section . This is followed by a complete block diagram of the single phase inverter along with its control circuit in section 7. A detailed study on a practical blanking time circuit is done in section 8, followed by the circuit for the opto -coupler and the driver required in the presence of blanking time circuit, this can be seen in section 9. Crasta Francis Austin Movin Page 5 Design and Implementation of a Single Phase Inverter Circuit The next section 10 gives a full circuit diagram implemented in this project to construct a single phase inverter, followed by the actual image of the inverter in section 11. Wiley Sons, 2003 [5] Ned Mohan, â€Å"Power Elect ronics, A First Course†, John Wiley Sons, Inc. [6] EHSANI, M. RAMANI, K. R. 1994. Recent Advances in Power Electronics and Applications . IEEE, p.9 [7] Application Note 9017: Manufacturing Technology of a Small Capacity Inverter Using a Fairchild IGBT . Fairchild Semiconductor. June 2001. p.4 [8] Chong B.: â€Å" Digital Implementation of PWM Generation Circuit and Control for a PV-Converter System†, Laboratory Notes for ELEM 5451 Mini Project Laboratory, University of Leeds, UK, 2012. Crasta Francis Austin Movin Page 56 Design and Implementation of a Single Phase Inverter Circuit [9] Zhang L.: â€Å"Section 2: Power Converters for PV Systems†, Course Notes for ELEC5564M Power Generation by Renewable Sources, University of Leeds, UK, 2011. [10] Datasheet Power MOSFET: â€Å" Design and Application guide for power MOSFET†, Vishay Siliconix, 12 March 2012. [11] J. Holtz, â€Å"Pulsewidth Modulation -A Survey,† IEEE Transactions on Industrial Electronics, Vol. 39, No. 5, Dec. 1992, pp. 410 -420. [12] Datasheet for TD351 Gate driver: â€Å" Design and Application guide for Advanced IGBT/MOSFET Driver†, STMicroelectronics, 2004.

Defining Respect :: Definition Respect Respecting Essays

"(What you want Baby, I got What you need Do you know I got it? All I'm askin' Is for a little respect when you come home (just a little bit) Hey baby (just a little bit) when you get home (just a little bit) mister (just a little bit) " Lyrics from the song, "Respect" by Aretha Franklin In three seperate dictionaries, respect is defined as a regard for or appreciation of the worth or value of someone or something. In my opinion, respect goes far beyond this definition. Respect is the cornerstone of the society in which we live. Although many look at respect as simply treating another person or thing with kindness, this word has many different aspects. For instance, I would not give an elder the same type of respect that I would give my peers or myself. Respect is not considered a neccessity in this world but, I can’t imagine a person getting very far in life without this virtue. Self-respect is probably the most important value for a person. It is said that in order to earn the respect of others, a person needs to learn to treat oneself with respect. I think that self-respect has a lot to do with one’s self-esteem. Self-esteem is an opinion of one’s own worth. For example, a girl that sleeps around will probably earn the reputation of a slut or a tramp. In reality, she is coping with the stresses of a low self-esteem.

Beware the Cat Essay

In Beware the Cat, William Baldwin’s immediate target is Catholicism. This book is one of many anti-catholic satires that appeared during Edward VI’s Protestant reign. In this story Baldwin goes beyond putting down the practices of the Church of Rome and exposes some of its foundational problems. He portrays, satirically, how knowledge is obtained and passed down in the church. At this time the culture was going through a transition from a largely oral and visual way of communicating to one based on text. The whole idea of Protestantism is about having a personal relationship with God and not relying on someone else to read the Bible for you. But what about those that didn’t have access to a Bible? Again, people were left to rely on the church and the traditions that were being passed down. The trouble with traditions is that after so long, one can’t be certain of their origin. We see a debate being set up in the story about where true authoritative knowledge comes from. From the Protestant view, the trouble with that is these traditions and stories can and do mislead the devout christian. In the beginning of the book in The Argument, Streamer disagrees with the author on what makes up knowledge; whether it is gained by experiences or authors (the reading of textual evidence). In Streamer’s Oration we see that he gets off track a number of times as he tries to begin his story. We find him wandering from gate to gate, talking about about how the gates got their names. It is evident that he doesn’t quite know where or how to begin his story. The use of the word gate is exceptional because Streamer is truly searching for an entrance for his story line. Because he can’t seem to find it, it foreshadows the fact that Streamer’s knowledge, as we come to find out, really has no origin of its own. Baldwin uses another play on words with the word Criplegate and cripple, foreshadowing again that Streamer’s kind of reasoning has crippled him. We read that Streamer’s experience with cats is based on other people’s stories about cats, and that their stories are based on yet another series of stories. Here Baldwin is demonstrating how Catholicism has passed down tories and oral traditions over time and we never really know the origin of these stories and traditions well enough to prove them. It also shows the reader that these kinds of stories simply lead to more stories and it ends up being uncontrolled and unmonitored. He then questions if having this experience based knowledge is truly having knowledge at all. Baldwin is building the story up in a rational way, for example, suggesting that the cats use human transportation and by suggesting that they revenge the death of Grimalkin, forming a close knit society, again alluding to the Catholic church. What we read about in Part I sort of comes to life in Part III as the animals take over the narration of the story. They begin to tell tales of their vast experiences with humans. They show us a world where humans are an easy mark (where the wife believes that the cat is old woman’s daughter) and preposterous (where the sound of Mouse-Slayer’s feet brings panic to a town). In Part I we read about preying animals and Part III is then dealing with preying humans. The old woman takes advantage of the young men, then they take advantage of others in order to keep paying the old woman, in order to spend time with the girls. This vicious cycle is representative of the Roman Church because she (the old woman), like the church, prospers from deceiving people and enticing them to do harmful acts in order to get her money. She is also making the young men psychologically dependent on her in a way, again, not unlike the church. In this work we’re able to see what happens in a religion and in a culture where written text plays a minor role and also when oral communication (traditions, passed down stories) is left uncontrolled by any textual authority.

America s Superpower Status Of The Middle East And Latin...

In my opinion, America is a declining power as a result of imperial over-reach. It is commonly believed that the United States is experiencing the decline of its global power. According to Christopher Layne, Distinguished Professor of International Affairs and Robert M. Gates Chair in National Security at the Bush School of Government and Public Service, argues that global power is shifting from West to East, leading to an American decline in influence and loss of global dominance. Those who support the notion that America’s superpower status is fading often argue due to its policies in the Middle East and Latin America, America lost its soft power influence over other countries. The war in Iraq is widely considered a failure that†¦show more content†¦Besides, the U.S. economy still hasn’t fully recovered from the 2008 financial collapse, while other countries such as China, India, Brazil, and Turkey are becoming stronger in terms of their economies and militar ies. There are also several consideration which are a moral slide, no genuine threat like the Soviet Union and a government that is far too large. As the moral slide, America has diversity, tolerance, compassion, and niceness so much that those traits practically make up the core of a left-wing pseudo-religion because they re among the very few areas where we ve morally surpassed previous generations of Americans. However, it s worth asking how you think modern Americans compare to previous generations on traits like charity, chastity, duty, Godliness, honesty, honour, industriousness, respect for authority, work ethic, and self-reliance. Most people would agree that modern Americans don t even come close to measuring up. Next, there is no genuine threat like the Soviet Union. While Ronald Reagan s defeat of the Soviet Union freed hundreds of millions of people and neutralized a terrible threat to America and the world, it did have one rather significant negative effect: It made Ame ricans very complacent. For example, during the Cold War, it seems almost unimaginable that America would have discontinued its manned space program.