What is an Inverter?

October 31st, 2013 | Posted in Electrical distribution
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New series of tutorial by our mamber Nasir! This time, let him tell you about inverters. Here’s the 1st part.

Introduction

An inverter is an electrical device which converts DC voltage, almost always from batteries, into standard household AC voltage so that it is able to be used by common appliances. In short, an inverter converts direct current into alternating current.

Direct current is used in many of the small electrical equipment such as solar power systems, since solar cells is only able to produce DC.

They are also used in places where a small amount of voltage is to be used or produced such as power batteries which produce only DC. Other than these fuel cells and other power sources also produce DC.



What is an Inverter

Why to use an Inverter?

But then the question which arises here is that why there is a need to covert direct Current to an alternating Current? The answer to this question is the simplest one.

We all know that the main electricity supplied to our homes from the power stations is Alternating current at 220 Volts. That’s one main reason that the electrical equipment which require high voltages and currents are manufactured such that they work on AC since it is supplied to our homes.

Other than this, AC power is widely used and since most of the appliances require a relatively higher amount of power than DC can supply, since DC power is designed to work on low voltages. So due to the reason that the power produced by DC producing devices has to be made available to our regular appliances, we need inverters now a days.

What is an Inverter 2

Basic Types of Inverters

During the conversion process, the voltage is also increased. But due to Ohms Law we know that an increase in voltage also leads to a decrease in current, so the overall output current is decreased when the DC Signal is converted into an AC one.

Depending upon this working, there are two main types of inverters:

  • Stand Alone Inverters
  • Grid Tie inverters

A small description of these inverters is given below so that you can know the basic difference in their working principles. In our later tutorials, they would be described the best possible detail.

  1. Stand Alone inverters
  2. These are the basic type of inverters, which along with the inversion of DC to AC, also produce increase the amplitude of the voltage and hence produce a change in the frequency.

    The output of these types of inverters is a sine wave usually, but in some cases the output gets distorted due to several reasons and appears in the form of a modified sine wave or a square wave.



    What is an Inverter 3

  3. Grid Tie inverters

In case of Grid Tie inverters, as their name indicates, the output AC power is supplied to a grid type network, i.e. a larger scale supply unit. Afterwards, through this unit, the power is distributed further. Due to this reason they have a complex construction and internal circuitry, because they have to synchronize with the grid network.


These were the two basic types. The working of an inverter will be explained in the next tutorial. So stay tuned and keep visiting us to know their working in detail along with their principles and performance parameters.

Nasir.

Comment(s) to “What is an Inverter?”

  1. Nasir,
    Enjoyed reading your blog on inverters. My company, Prohm-tect USA produces a line of electrically and thermally conductive pastes that protect against corrosion, and reduce resistance in electrical connections. I would think that our products could give inverter connections an extra degree of protection and dissipate heat in the connections. What input can you give me? Thanks!

  2. cheruiyot Hillary says:

    how can i construct my own inverter????help me!

  3. SANDEEP SINGH RAWAT says:

    But due to Ohms Law we know that an increase in voltage also leads to a decrease in current, so the overall output current is decreased when the DC Signal is converted into an AC one.
    The above two line is incorrect , according to ohms law voltage is directly proportional to current .
    so how can ncrease in voltage also leads to a decrease in current?

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