PWM
PWM
(OP)
Hello!
I want to ask something about the Pulse Width Modulation. Which voltage value is more important? Average (V*duty) or RMS (V*sqrt(duty))? If I calculate the work, then the PWM's RMS value represents the equal DC voltage. By contrast every one uses the average voltage formula - etc. 10V, 50% PWM equals 5V DC.
What's the truth?
Best Regards
mjoco
I want to ask something about the Pulse Width Modulation. Which voltage value is more important? Average (V*duty) or RMS (V*sqrt(duty))? If I calculate the work, then the PWM's RMS value represents the equal DC voltage. By contrast every one uses the average voltage formula - etc. 10V, 50% PWM equals 5V DC.
What's the truth?
Best Regards
mjoco





RE: PWM
Keith Cress
kcress - http://www.flaminsystems.com
RE: PWM
RE: PWM
Thanks for the quick reply!
I know the DC motor is kind of a "low pass filter", it suppresses the AC component of the PWM signal. The rest is the DC component what equals the average value of the PWM. Is this correct? So, this is the reason why I should use the Vin*Duty formula by motor control instead of Vin*sqrt(Duty)?
Best Regards