Electrical Engineering Assignment Help>>电力电子设备

Power Electronics Assignment Help, Power Electronics Homework Help, Live Electrical Engineering Experts

Expertsmind.com提供电力电子分配帮助，电力电子作业帮助，电力电子项beplay体育怎么安装目帮助和解决方案以及电力电子问题的答案，并在2beplay提款封号4*7小时内获得最佳在线支持。电气工程experts atExpertsmind.comare well experienced and qualified in field of teaching; they are familiar with all types of problems faced in power electronics subject. OurEEexperts are capable to solve complex power electronics problems within very less time. Students in engineering stream who are facing trouble in their powerelectronics engineeringassignments and projects, they can get solved problems from experts atExpertsmind.com. Expertsmind provides step by step power electronics question’s answers in very economical charges.

Power Electronics Engineering

电力电子可以称为将电力从一种形式转换为另一种形式的艺术和科学。电力电子涉及电力的控制和转换，是固态电子设备用于转换和控制电力的。电子转换器在电能的转化和修饰中发现了它们的用法。因此，这些电压，频率或电流发生变化的任何地方都可以使用。转换范围从几毫瓦（在手机中）到数百兆瓦（HVDC传输系统）。电流和电压用于携带古典电子中的信息。电力电子中的同一携带电源。因此，电力电子的主要指标是其效率。汞电弧阀是第一个非常高的电力电子设备。二极管，晶体管和Thysistors是用于在现代系统中执行转换的半导体开关设备。 The power electronics also process substantial amount of energy in comparison to the electronic systems which are concerned with processing and transmission of data and signals. The ac/dc converter (also called as the rectifier), is one of the most widely found power electronic device which is contained in many consumer electronic devices as well. It is found in personal computers, television sets, battery chargers etc. The induction motor contains the variable speed drive, which is the example of electronic power device which is widely used in the industries. The power of the VSD range from a few hundred watt to tens of megawatts.

Power electronics originated at the beginning of this century. Some great books with power writing concepts were published between the time periods of 1930 to 1947. They contained lessons and chapters on the application of grid controlled gas filled tubes. As the gas filled thyratrons and mercury rectifier had limitations, the equipments were also manufactured in limits. Julius Lilienfeld disclosed the field effect principle in 1930. Another major development was the demonstration of point contact transistor by Walter H Brattain john Bardeen in 1947. The manufacturing of semiconductor electronics equipment began with the invention of bipolar junction transistor in1948 and in 1950 semiconductor diodes began appearing. Powerful FET development has spread world wide with the end of the decade of 1970. The type of input and obtained output decides the type of power conversion system. The rectifier converts ac to dc. The inverter converts dc to acidic to dc is converted by dc to dc converter and ac to ac is converted by ac to c converter. Energy saving has always been a priority for the engineers. The loss of energy by a [power electronic device should be minimum. The efficiency of a power electronic converter is also of prime importance. The product of the voltage across the device with the current through it gives the instantaneous dissipated power. Thus when the voltage or current is zero, the loss of power device is minimum. That is the loss is minimum when the device is in a off or on state. Considering these findings, the electronic power converter was built for the on or off device operating in the switching mode.burts of energy are transferred form the converter’s input to output.

Wide application of power electronic systems

1. dc to dc converters are used for mobile phones, PDA’s etc for maintaining their voltage at affixed value. These are also used for factor correction and electronic isolation.

2.常见的电子设备such as television sets, computers have built in rectifiers. These convert form ac to dc. They also change the voltage levels to overcome the fluctuating voltage.

3. The ac to ac converters change the frequency or the voltage level. It also finds its application in power distribution networks where they are used to exchange power between the utilities frequencies of 5o and 60 Hz power grids.

4. The dc to ac converters find their prime application in invertors and ups (the emergency lighting systems).during the availability of the mains, they charge the mains and when the main electricity fails, it produces the ac electricity form the dc battery.

Rectifiers can be further classified as controlled and UN controlled rectifiers. The controlled rectifiers are classifies as controlled and fully controlled rectifiers.