Rectifiers and inverters, Electrical Engineering

RECTIFIERS AND INVERTERS

Rectification is  the process of conversion of alternating input  voltage  to direct output voltages. Converters are controlled  rectifiers which  convert constant ac voltage  to variable  de output  voltage. Since  the diode rectifiers are  uncontrolled rectifier because it gives fixed  output  voltages  only  whereas in controlled  rectifiers thyristors are used are  used to  control  the output voltage of converter by varying  the delay or firing  angle. These are phase controlled rectifiers which  are simple  less expensive and highly efficient. These are  also called ac de converters and are used extensively in industrial applications for example steel  rolling mills paper mills pining presses textile mills traction system magnet  power suppliers Hvdc  transmission  variable  speed  drives portable hand  tool  drives  electro  chemical and electrometallurgical processes etc.

The reverse  process of rectification is  know as inversion. An inverter converts fixed de voltage  to a variable ac voltage and variable frequency. Ups  induction heading , HVDC power  transmission    variable  frequency drives electric  vehicle drives and air  conditioning  are some  of important application of  inverter. An power  when main power is not available. When main  power is  restored a  rectifier is uded to supply DC power  to a higher  to recharge the batteries. Inverters convert  low  frequency main AC power is first rectified to provide DC power. The  inverter then  changes the Dc  power to high frequency AC power. With ?HVDC  power  transmission  AC power is rectified and high  voltage DC power is transmitted  to another location. At the receiving location an inverter n a static inverter plant  converts the power back to AC. A variable frequency drive controls the  operating speed of an AC motor. a an  inverter provides the controlled power. Inmost  cases the variable frequency drive includes a rectifier so the DC power for the   inverter can be provided from main AC power. Since an inverter is the key  component variable frequency driver are sometime called  inverter drives of just inverter. Adjustable speed motor  control  inverters are currently used to power the  traction motor  in some  electric locomotives and diesel electric locomotives as well as some battery electric vehicles and hybrid electric highway  vehicles. An air conditioner bearing the  inverter tag  uses a variable frequency  drive  to control  the speed  of the motor  and thus  the compressor.

 

 

Posted Date: 4/2/2013 8:11:00 AM | Location : United States







Related Discussions:- Rectifiers and inverters, Assignment Help, Ask Question on Rectifiers and inverters, Get Answer, Expert's Help, Rectifiers and inverters Discussions

Write discussion on Rectifiers and inverters
Your posts are moderated
Related Questions
Q. Consider the magnetic circuit shown in Figure. Assume the relative permeability of the magnetic material to be 1000 and the cross-sectional area to be the same throughout. Deter

When recording infrasound waves or microwaves how do they vary from one another? Ans) By microwaves, do you mean "radio signals", like in a microwave oven? These have nothing t

Which Segment is used to store interrupt and subroutine return address registers? Ans) Stack Segment in segment register is used to kept interrupt and subroutine return address

What is a coprocessor? It is a specially designed microprocessor which take care of mathematical calculations including integer and floating point data .it is intended to work

If a compressor in a system can change a message crest factor from 3.2 to 2, while maintaining its peak amplitude constant, find the decibels of improvement in signal-to-noise rati

Q. (a) Determine the voltage at A in Figure . (b) With V i = 10 V, R 1 = 10 k, R 2 = 1000 , and A = 100, find the current i .

sample problem and solutions with answer

i need to submit a still model or a working model on science day(28 February). can you help me....

Jump Instruction There are two types of jump  instruction unconditional jump conditional jumps

Revision  of Basics Although  it is  assumed in this book  that the  reader has  enough  knowledge of  various number systems ( binary, octal and hexadecimal and their relation