Introduction: In modern applications, efficiency plays a very important role. Power electronics can be used to increase the efficiency in basic circuit designs. This particular exercise introduces the Buck Converter, also known as a chopper. It is a step-down DC to DC switching converter used in applications where the output voltage is required to be lower than the input voltage supplied by a DC source. Consider the Circuit shown in figure 1.1. The output voltage (voltage flowing into the resistive load) is required to be 5 Volts whereas the voltage supplied by the DC source is 10 Volts. This output can be obtained by using a Resistor of value 5 Ohms. Current flowing in the circuit is equal to 1 Amp. The output voltage is obtained as per …show more content…
When the switch is closed (ON Mode) – The diode acts as an open switch. Current flowing into the circuit from the DC supply will charge the inductor and the capacitor as well as supply the load current. The current in the load and the charge on the capacitor build up gradually as some energy is being stored in the inductor. Equivalent circuit shown in Figure 3.2 2. When the switch is open (OFF Mode) – The diode turns ON due to the energy stored in the inductor. Current flows into the load due to the back e.m.f from the inductor and the forward biased diode. As the energy is the inductor depletes and the load voltage starts to fall, current from the capacitor acts as a source and keeps the load voltage constant. Equivalent circuit shown in Figure 3.3 Figure 3.2 Figure 3.3 Figure 3.4 shows the inductor current waveform during the two operating modes of the Buck Converter (ON and OFF Mode) where D = Duty Cycle, T = Period, = Max inductor current, = Min inductor current. Note that the current is always positive thus it is continuous. Figure 3.4 Equations and Derivations: The Duty Cycle is defined
Muller, S., Prowse, D. L., & Soper, M. E. (2012, September 25). CompTIA A+ Cert Guide: Power Supplies and System Cooling | Foundation Topics | Pearson IT Certification. Retrieved March 20, 2014, from http://www.pearsonitcertification.com/articles/article.aspx?p=1945640
The Buck Knives Hunter folding knife is a very simple pocket knife for everyday use and outdoor activities such as hunting. The single stainless steel blade measures out at 3 3/4 inches long, making it fitting for fans of medium-sized knives. The implementation of stainless steel allows the blade to last for years with everyday wear and tear and even rough conditions outdoors. The blade for this particular knife is a straight-edge which is great for common uses such as self-defense and everyday cutting purposes.
In the Lester Electronics Scenario, there are several things going on at once. Shang-Wa had already suggested a partnership to Lester Electronics, but this is now becoming more urgent due to a hostile takeover bid by TEC. In fear of losing
Camera work plays a key role in establishing Nolan's style in the opening scenes of The Dark Knight. The different shots Nolan uses gives the audience a deeper understanding of the direction in which the film is going. We are introduced to the film with an establishing shot of Gotham City, as the camera zooms in on one particular building. This helps establish the location and setting, as there are several skyscrapers present and it is day time. The next important shot in the opening scenes is when the camera zooms in on a man's lower back and mask, standing at the corner of a road. Nolan uses this shot to signal to the audience that this man is involved, he is in the centre of the frame therefore he will be important.
Third Stage[t2-t3](Fig.9): At instant t2 The switch is turned off at the time t2. energy stored in L1 transfer to the Capacitor CM and also energy transfer through capacitor CS1 and CS2
Buck had been raised in California, on the ranch of Judge Miller. There he had the run of the place and was loved and pampered by all. Unfortunately, one of the judge's workers had a gambling problem and stole Buck to sell him for fifty dollars. Buck fights being tied, caged, and beaten, but his efforts only frustrate him. He is put on a train and a boat, being shipped to Alaska to be used as a sled dog. Although he is miserable on the journey, Buck learns an important lesson - the law of the club. If he does not obey, he will be beaten.
Buck is an interesting story about a young boy from Zimbabwe, who moved to Philadelphia and gets caught up in the sex, drugs, and violence that are in the streets of Philly. Life gets pretty hard for him as his family goes through tough times and he is forced to find his way through the world on his own and of course he manages to do so. For this book report I have chosen chapters 1-3 to summarize and express how these chapters connect or influence me as a college student.
with a p.d. of 5v, it transfers 5J of energy to the p.d. In it's
Buck was a dog that was stolen and sold on the search for gold.In the book Call of the Buck is challenged by his new life in the arctic darkness. Buck has to adapt to survive under the law of club and fang,while also moving up in rank and make peace with his instincts.
After the flashing lights we see a train cross a bridge in the darkness, its illuminated windows loom blankly. Then on
In the opening scene, the camera zooms out to focus on both the men individually. The camera switches focus back and forth from Harmonica to Frank. The camera views the men from their faces to the whole body picture. By doing this effect to the men’s character it builds suspense on who may or may not fire first in the movie. Throughout, the beginning moments of the duel, the camera angles follows both men capturing them both, but the while the camera angle is facing both of the men I can see the emotional expressions in each of their faces. In Harmonica’s face, I see revenge, hurt, but also a man of much courage and bravery to defeat a man who had him kill his brother. In Frank’s expression I see a man of much confusion since at this point in time he still does not truly recognize who Harmonica is. Both men lead to a very suspenseful, but meaningful ending to the movie. I can sense violence in the future by the way the camera was used. The camera angles allowed Leone to depict a scene of terror, but builds the bigger picture of what Leone intended for it to be. I feel that movement was also a major key in the film. Right before, the men start to approach one another Frank begins to take off his coat and throw it to the grown. From this, Frank realizes that he is going to have to face the consequences of his actions, and be a man about it. I
The movie opens up introducing the main characters, Paige and Leo. Paige and Leo are a happily married couple who live in the city and on one very snowy night, are involved in an accident. The accident causes Paige to be thrown onto the hood of the car with her head leading her way crashing through
The risk management plan is for Flayton Electronics following their breach in security of their customer’s information. The document provides an explanation and description of the risk management process undertaken throughout the life cycle of this project. The project manger will be responsible for reviewing and maintaining the Project Risk Management Plan. The manager will ensure that all the risk process factors are appropriate to deal with the risks highlighted in the project.
Their performance can be modelled, predicted and analyzed using equivalent circuits, and this experiment examines one of these circuits. MEASUREMENTS ------------ Short-circuit test: Primary voltage (Vsc) = 26V Primary current (I1) =
Whereas the 1.0 mol and 0.5 mol concentrations increases steadily at a slower rate. This obviously shows that if the voltage increase, the weight also increases. Hence I can conclude; the higher then voltage and concentration, the more copper is produced. The reason for this would be because we used electrolysis. This is used to separate metals from their ores and metal compounds.