discussed in the next lesson), whic

discussed in the next lesson), which can provide a VVVF output with enhanced output voltage
quality.
In spite of the limitations, discussed above, the square wave inverter may be a preferred choice
on account of its simplicity and low cost. The switch control circuit is very simple and the
switching frequency is significantly lower than in PWM inverters. This results in low switching
losses. The switch cost may also be lower as one may do away with slower switching devices
and slightly lower rated switches. Another advantage over PWM inverter is its ability to output
higher magnitude of fundamental voltage than the maximum that can be output from a PWM
inverter (under the given dc supply condition). Listed below are two applications where a 3-
phase square wave inverter could be used