The inverter can be classified as

The inverter can be classified as

Right Answer is:

Both 1 and 2


A device that converts D.C  power into ac power at the desired output voltage and frequency is called an inverter, The frequency of the ac output voltage can be fixed at any desired fixed frequency or variable frequency. By varying the input dc voltage and maintaining the gain of the inverter constant, the output ac voltage can be changed. In modern times for the conversion from dc-to-ac, a thyristor with forced commutation or other controllable turn-on and turn-off devices like BJT, MOSFET, IGBT, MCT, GTO, etc. are used. A number of dc power sources such as batteries, dc generators, and rectified power supplies are available. The static inverter is a convenient way to transform this popover into a more usable ac form.

The D.C  power input to the inverter is obtained from an existing power supply network or from a rotating alternator through a rectifier or a battery, or magneto-hydrodynamic (MAD generator. The configuration of ac to D.C converter and D.C  to ac inserter is called a dc-link converter. The rectification is carried out by standard diodes or thyristor converter circuits. 

The inverter can be broadly classified into two types

  1. Voltage source inverter 
  2. Current source inverter.

A voltage-fed inverter (VFI), or voltage source inverter (VSI), is one in which the D.C source has small or negligible impedance. In other words, a voltage source inverts has a stiff D.C voltage source at its input terminal.

A current fed inverter (CFI) or current source inverter (CSI) is fed with adjustable current from a D.C source of high impedance,  i.e. from a stiff D.C current source. In a CSI fed with the stiff current source, output current waves are not affected by the load.

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