Power Inverters

Power Inverters 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. Used in applications where there is a frequent power cut off, because in caseof power failures, inverters are a very good and efficient power remedies.

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Detailed Description for Power Inverters

A power inverter, or inverter, is an electronic device or circuitry that changes direct current (DC) to alternating current (AC).

The input voltage, output voltage and frequency, and overall power handling depend on the design of the specific device or circuitry. The inverter does not produce any power; the power is provided by the DC source.

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. This is shown below:

http://cormsquare.com/TinyMceUploads/electr.PNG

The modified Sine wave inverter or quasi 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. The output waveform of a modified sine wave inverter is shown below: 

 

http://cormsquare.com/TinyMceUploads/modiju.PNG

 

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:

1. More efficiency, hence consumes less power.

2. 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

 

 

Applications:

DC power source usage

Uninterruptible power supplies

Electric motor speed control

Power grid

Induction heating

 

 


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