PWM signal transfer technique is a process of controlling stable values of AC electric volt, Which is Following a time period for on or off. This technique give us a high value and Zero or low value of voltage within a time period.
In PWM signal processing, we keep the frequency be fixed.After that we change voltage value in that time period. In such way we change their PWM percentage. If PWM value be 30%, that means in a time period 30% of time voltage is high and in 70% of time voltage is low.