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Types of Inverters:

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As we know that inverters are finding their extensive uses now a days. Previously they were only used in some main applications, which would be large scale and expensive. But now a days, inverters are like a small compulsory electronic device, on which many of our other main electronic equipment depend.They are extensively used, not only because of their universal function of converting DC power to AC power, but also because of their high efficiency, reduced power costs and versatile applications.

These days, they are being used extensively in applications where there is a frequent power cut off, because in case of power failures, inverters are a very good and efficient power remedies. For every classification, we form some basis first, depending upon which we can further categorize our results for easier understanding and a better approach. This is done in order to promote better understanding and a more extensive classification of different things.In the same way, we primarily classify inverters on the basis of their output characteristics. So there are three different types of outputs we get from inverters, and hence we classify inverters into three primary classes, which are:
  • The Square Wave inverter.
  • The Modified Sine wave inverter or quasi sine wave inverter.
  • A Pure sine wave inverter


The Square Wave inverter

A square wave inverter is one of the simplest inverter types, which convert a straight DC signal to a phase shifting AC signal. But the output is not pure AC, i.e. in the form of a pure sine wave, but it is a square wave.At the same time they are cheaper as well. The simplest construction of a square wave inverter can be achieved by using an on-off switch, before a typical voltage amplifying circuitry like that of a transformer. The output of this type of a circuit is a square wave.

The modified Sine wave inverter 

The construction of this type of inverter is a bit more complex than a simple square wave inverter, but still it is a lot simpler than a pure sine wave inverter.A Modified sine wave shows some pauses before the phase shifting of the wave, i.e. unlike a square it does not shift its phase abruptly from positive to negative, or unlike a sine wave, does not make a smooth transition from positive to negative, but takes brief pauses and then shifts its phase.It is also called as  quasi sine wave inverter.


A Pure Sine Wave Inverter

The electrical circuit of a pure sine wave inverter is far more complex than a square wave or modified sine wave inverter. Another way to obtain a sine output is to obtain a square wave output from a square wave inverter and then modify this output to achieve a pure sine wave. A pure sine wave inverter has several advantages over its previous two forms:
  • More efficiency, hence consumes less power.
  • They can be adjusted according to your personal power requirements, since several types are available with different power outputs.
  • The output of a pure sine wave inverter is very reliable, but at the same time, there is a tradeoff between the price and reliability.
  • Due to this reason they are the best option for sensitive equipment.
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