Using Switching Devices to Develop AC Output

In the following example, one phase of a three-phase output is
Output used to show how an AC voltage can be developed. Switches
replace the IGBTs. A voltage that alternates between positive
and negative is developed by opening and closing switches in
a specific sequence. For example, during steps one and two
A+ and B- are closed. The output voltage between A and B is
positive. During step three A+ and B+ are closed. The difference
of potential from A to B is zero. The output voltage is zero.
During step four A- and B+ are closed. The output voltage from
A to B is negative. The voltage is dependent on the value of the
DC voltage and the frequency is dependent on the speed of the
switching. An AC sine wave has been added to the output (A-B)
to show how AC is simulated.