Generating variable frequency wave output in VFD AC drives.If total time is 10 ms then pulse width is of 3 ms. For example duty cycle is 30 % means on time is 30% of total time – that means pulse width is 30 %. Its always measured in % and it directly indicates on time of pulse – that means width of pulse. There is very popular term known as duty cycle that is ratio of on time to total timeĭuty cycle = on time / total time = on time / (on time + off time) Keeping the total time (frequency) fixed, on time and off time are changed (if on time increased, off time decreased and vice versa). PWM stand for Pulse Width Modulation – means width of pulse is varied. Most of the Electronics and Electrical people are aware of what is PWM?
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