DC-AC conversion - Inverter and frequency converters

DC/AC converter, also described as “Inverter”, is a circuit that converts a DC source into a sinusoidal AC voltage to supply AC loads, control AC motors, or event connect DC devices that are connected to the grid. Similar to a DC/DC converter, the input to an inverter can be a direct source such as battery, solar cell, or fuel cell or can be from an intermediate DC link that can be supplied from an AC source. Inverters can be usually classified according to their AC output as single-phase or three-phase and also as half- or full-bridge converters. De Lorenzo has designed two configurations to implement this category. One configuration to cover the inverters with PWM control and another configuration to explain the properties of the frequency converter circuit. Regarding the frequency converter and because it is difficult to change the frequency of an AC sine wave in the AC mode, the first job of a frequency converter is to convert the wave to DC because it is relatively easy to manipulate DC in order to make it look like AC. The three main components of all frequency converters are Rectifier, DC Bus and Inverter. They are dedicated to high schools and first years of university.