What is percentage ripple current?

Status
Not open for further replies.
T

treez

Guest
If I have a boost converter SMPS operating in Boundary conduction mode (aka critical conduction mode)...then is that 200% ripple on the input current?, or do you call that 100% ripple?
 

Ripple Percentage is give by
[(IRMS2 - IDC2 )1/2]/IDC*100
Where,
IRMS = RMS value of current being measured
IDC = Average value of that current

In the case of "Boundary Mode Conduction", you can approximate the current waveform to be triangular. Now you must perform appropriate integrations to find the RMS and the average value.
By the way, I think you rather wanted to ask " What is the DENOMINATOR of the equation of ripple percentage". Well it is IDC and NOT IRMS
 
Reactions: treez

    T

    Points: 2
    Helpful Answer Positive Rating
surely a BCM boost has 200% ripple?

(ripple current pk-to-pk/ average inductor current) * 100 = 200%
 
Last edited by a moderator:

Peak to peak ripple current does not have to do anything with the ripple factor. The RMS value of ripple must be considered.
Iripple2 = I2 - Idc2
where
Iripple = RMS value of ripple current
I = RMS value of current whose ripple must be found
Idc = Average value of current whose ripple must be found
 
Reactions: treez

    T

    Points: 2
    Helpful Answer Positive Rating
I think we are talking at crossed purposes.
You are right
I am right
We are talking about different things.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…