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what is an inverter

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 are 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.

An inverter converts the DC voltage to an AC voltage. In most cases, the input DC voltage is usually lower while the output AC is equal to the grid supply voltage of either 120 volts, or 240 Volts depending on the country.

The inverter may be built as standalone equipment for applications such as solar power, or to work as a backup power supply from batteries which are charged separately.
The other configuration is when it is a part of a bigger circuit such as a power supply unit, or a UPS. In this case, the inverter input DC is from the rectified mains AC in the PSU, while from either the rectified AC in the in the UPS when there is power, and from the batteries whenever there is a power failure.

There are different types of inverters based on the shape of the switching waveform. These have varying circuit configurations, efficiencies, advantages and disadvantages
An inverter provides an ac voltage from dc power sources and is useful in powering electronics and electrical equipment rated at the ac mains voltage. 

In addition they are widely used in the switched mode power supplies inverting stages. The circuits are classified according the switching technology and switch type, the waveform, the frequency and output waveform.


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