RMS Calculations

by Brad Suppanz

---

Some typical periodic power supply waveforms are shown below.

Below is a live web calculator that you can use to find the RMS, DC, and AC components of waveforms. Just enter the values to desribe a waveform based on the figures above.

Enter V1 or I1: 
Enter V2 or I2: 
Enter the duty cycle, D:  (where D is between 0 and 1)

RESULTS:
(a) Pulse Waveform:
RMS = V1*SQRT(D) = 
DC = D*V1 = 
AC = SQRT(RMS^2 - DC^2) = 

(b) Triangle Waveform:
RMS = SQRT((I1^2 + I1*I2 + I2^2)/3) = 
DC = (I1 + I2)/2 = 
AC = SQRT(RMS^2 - DC^2) = 

(c) Trapezoidal Waveform:
RMS = SQRT(D*(I1^2 + I1*I2 + I2^2)/3) = 
DC = D*(I1 + I2)/2 = 
AC = SQRT(RMS^2 - DC^2) = 

---

Return to SMPS Notes Index

---

© Copyright 1997 Brad Suppanz.  All rights reserved.
Links to this page are encouraged.
Email comments and suggestions to:

Sign My Guestbook
View My Guestbook

Written 12/16/97
Last updated 7/20/2004 
Number of hits:

---

The page below is an antiquarian user generated website brought to you by a website archive. It was probably not updated since a long time. The page has been mirrored from Geocities.com in october 2009 because Geocities was closed after providing free webhosting for almost 15 years. As we arent the respective author we have to disassociate ourselves from any questions on this page. For any question on this website archive visit our main page: OoCities.com.