Introduction to Inverter
Description of Inverter is provided which conversion of the d.c signal into an a.c signal of desired frequency and magnitude. Along with a simple circuit of single-phase inverter, its application in real life is presented.
Summary
Description of Inverter is provided which conversion of the d.c signal into an a.c signal of desired frequency and magnitude. Along with a simple circuit of single-phase inverter, its application in real life is presented.
Things to Remember
1) Inverter converts d.c signal to a.c signal of desired magnitude and frequency. It does revese of what a rectifier does.
2)If the input dc is a voltage source, the inverter is called a Voltage Source Inverter (VSI). One can similarly think of a Current Source Inverter (CSI), where the input to the circuit is a current source. The VSI circuit has direct control over ‘output (ac) voltage’ whereas the CSI directly controls ‘output (ac) current.
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Subjective Questions
Q1:
Write about Collection and Preservation of Viral Specimen
Type: Short Difficulty: Easy
<ul>
<li>Methods or media by which the bacteria is used to transport is not appropriate for the transport of virus.</li>
<li>Viral transport media is done to maintain and prevent the virus from dryness , viral viability during the process of transportation of virus and also prevent the overgrowth of contaminating bacteria.</li>
<li>Many of the formulations contain either Eagles minimum essential medium or Hanks balanced salt solution, along with fetal bovine serum or bovine serum albumin(BSA)</li>
<li>Especially in all cases for the viral analysis specimen collection , all the specimen should be collected in a good and appropriate manner from target organs.</li>
<li>Liquid-based transport systems contain a protein (BSA, gelatin , or fetal bovine serum) and a combination of microbial agents in buffered solutions.</li>
<li>Tissues for the viral analysis is also can be placed in this type of medium. For the virus transport phosphate buffered sucrose transport system is used.</li>
<li>If the available specimen in the laboratory is not placed appropriately in Stuart or Amies bacterial transport system then the specimen can be transferred into the viral transport medium system.</li>
<li>Collected swabs of the specimen are rinsed in a viral transport medium.</li>
<li>During the process of transportation, most of the virus are well survive at ambient (favorable) temperature. So the recovery of the viruses from the specimen with less in the number of a virus may be decreased by following the prolonged holding under the transportation condition, therefore, during the process of virus transportation, an ice or refrigerator is used.</li>
<li>Collected specimen of the virus should not be exposed above the room temperature</li>
</ul>
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Introduction to Inverter
Inverter
The inverter converts d.c signal to a.c signal of desired magnitude and frequency. It does reverse of what a rectifier does. The output of inverters could be single phase ac or three-phase ac but it is not possible to obtain a pure sinusoidal ac voltage from the practical inverter.
If the input dc is a voltage source, the inverter is called a Voltage Source Inverter (VSI). One can similarly think of a Current Source Inverter (CSI), where the input to the circuit is a current source. The VSI circuit has direct control over ‘output (ac) voltage’ whereas the CSI directly controls ‘output (ac) current’.
For the voltage source inverter, the input voltage remains constant while for th Current Source Inverter, the output current remains same. The output of the ideal inverter should be sinusoid but in the real life, it isn’t sinusoidal and contain certain harmonics. For low and medium power application, the quasi-square and square wave voltages are acceptable. The figure below presents a diagram showing a Voltage Source Inverter.

- From the viewpoint of connection of semi-conductor devices, semi conductor is classified as:
- Bridge Inverter
- Series Inverter
- Parallel Inverter
Application
• Uninterruptible Power Supply (UPS),
• Adjustable Speed Drives (ASD) for ac motors,
• Electronic frequency changer circuits used in induction heating, welding etc.,
• HVDC transmission at lower power levels
• Renewable Energy such as solar, fuel cell to AC conversion
• Electronic Ballast and Compact Fluorescent lamps
• Active Filters for power quality improvement
• Custom power devices: DSTACTCOM, DVR, UPQC,
• FACTS: STATCOM, SSSC, UPFC, etc.
References
1) Sakshar Virtual Lab. Single Phase VSI With Square Wave PWM. n.d. 15 05 2016. <http://iitd.vlab.co.in/?sub=67&brch=185&sim=460&cnt=1>.
Lesson
Inverter
Subject
Electrical Engineering
Grade
Engineering
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