Essay on Power Semiconductor Devices

Efficiency increases due to low energy consumption 3. It provide battery backup for about one hour 7.2 Application 1. To reduce cost, size and weight of a power supply 2. CCTV cameras, TV’s, monitor, PC’s, laptop and camcorder power packs, printers, fax machine, VCRs, portable CD players, microelectronics based devices in automotive, computing, communication, consumer electronics and industrial applications use SMPS. Controllable output power analysis of SMPS using PWM technique for DC appliances Sigma, Matar Page XXXVII CHAPTER 8 CONCLUSION Controllable output power analysis of SMPS using PWM technique for DC appliances Sigma, Matar Page XXXVIII  Suitable components were selected and tested for desired performance.

It is observed that the power factor is maintained closer to unity when the input voltage is reduced from 230V to 110Vrms. Figure 11 (a) and (b) shows the power factor correction of controller for various load condition such as 20% (60W) and 75% (230W). The power factor for the system is found to be 0.84 for light load condition and 0.99 for full load condition. The THD of input current at full load with predominant third and fifth harmonic components are shown in Figure 12(a) and (b).Third harmonics is found to be 4.8% and fifth harmonic component is 4.9% which are well within IEC 61000-3-2 standard during wide range of load variations. The variation in power factor with load is shown graphically in Figure 13(a). It can be inferred from the graph that improved resettable control operates at high power factor for all load condition whereas the conventional PI control has poor power factor under light load conditions. Figure 13(b) shows the comparison between the efficiency of the converter for varying load conditions with the conventional control method and the resettable integrator control. The converter’s efficiency is maintained at 92% for light load conditions and 96% for fully loaded condition with integrator control technique. Thus the improved resettable integrator controller provides a very simple and reliable solution for power factor correction and

Electrical Engineering is a well-respected and growing field of engineering that centers on the practical application of electricity, electromagnetism and electronics. The field is of considerable necessity to modern life and infrastructure, having applications in many diverse branches of modern life. Some of these include telecommunications, energy and power distribution, transportation, manufacturing and consumer electronics. In this report we will go over the education and coursework requirements, fields of the industry, the work environment, salary, tools of the trade, and professional organizations of electrical engineers.

Due to the rapidly growing role of electronics, electronic components, such as diodes, transistors, and integrated circuits are now omnipresent, impacting today’s society. Therefore, it is important to analyze projects and/or experiments related to diodes, transistors, and other components, to determine whether these projects and/or experiments bring us closer to a sustainable society, which is a society that satisfies current needs without compromising posterity’s future needs and fosters consonance between humans and their surroundings[1].

During lab, we have designed circuits proving each of these electrical principles. Now, let's apply this knowledge to a real world application.

The reactive power supplied by the STATCOM for DF improvement is capacitive in nature. Instinctively, the higher the STATCOM’s reactive power, the higher the dc-link voltage of the STATCOM (the higher the voltage requirements of the semiconductor devices).

Since the beginning, people have requested that Majestic Transformers create or fabricate a broad range of rectifier power supplies to distribute as a part of their application. Some of these units are as simple as fitting a bridge rectifier onto the output winding of a single phase or three phase transformer, while others are complicated. They involve using variable transformers, meters, line insulation monitors, and smoothing circuits ranging up to 7000A and injecting a current into railway conduction rail systems for testing, up to 5kV for running and testing high voltage

It is of great importance in our industries to cut the cost of power controlling with high efficiency and PWM satisfies this criteria. Therefore, it is

Doped semiconductors are very useful, as they make up the base for diodes. A diode is an electronic component that is used to make signal limiters, voltage regulators, switches, etc. Doped semiconductors also make transistors, they are devices that regulate the current flow and they act as a switch or gate for electronic signals. Transistors have three layers of semiconductors and when one layer senses a small change of current it creates a rapid change in the current through the whole component. As one can see, doped semiconductors are very important as they make the base of many electronic devices that we use daily

In the conversion of alternating current to direct current, electrons from alternating current will also enter the diode on the left. However, in part to the oscillating nature of alternating current, the diode output of direct current will be relatively choppy, since electrons can only move towards the electron holes in the P-type semiconductor (Kuphaldt).

Fig 21: Comparative analysis of V-I characteristics of MESFET at different W & VGS = -0.4V

Popular applications include: RV Rooftop A/Cs, marine A/Cs and chillers, residential and commercial A/Cs, refrigeration equipment, and high-horsepower pump motors.

The blocking diode is a helpful tool for limiting the direction energy can flow through a wire to just one direction. It uses a semiconductor P/N junction achieve this behavior.

When writing a "low", the bit-line BL is set at "high" state, and both word-lines WL1, WL2 are switched on. At this moment, the thyristor behaves like a reverse biased diode. After the write operation, both gates are shut off, and a "low" state is stored in the thyristor

The purpose of this paper is to give a greater understanding of the semiconductor world, for Physics 100 students who have a little knowledge of electronics. I will cover conductors, insulators, semiconductors, and the operation of a diode and a transistor. The reason that it is important to understand these devices is the vast effect that they have had on our modern world. Our lives are filled by electronics, especially in this computerized age that we live in, and I have found that a knowledge of some electronics has greatly helped my understanding of the many electronic devices that we deal with on a daily basis.