Blog for students taking ECEN5817 Resonant and Soft Switching Techniques in Power Electronics, ECEE Department, University of Colorado at Boulder, Spring 2012
For problem 19.1 a, I wonder how Rinf is being used ? For my VOC equation I get: VOC = Vs/(1+Cp/Cs) / ( 1 + Ls * Cs||Cp s^2 ) = Vs/(1+Cp/Cs) / ( 1 + s^2/winf^2 )
then for my Isc I use formula: Isc = VOC / Zoo given Zoo = (jXs||jXp)
Final form of my Isc is: Isc = s*Cs / ( Ls*Cs*s^2 + 1) I am stuck on how to represent Isc in term of n,Vg, and F with this form.
Could you explain where you got your VOC equation? I am using the ||H_inf||||v_si|| equation, and using a voltage divider as in class for ||H_inf||.
I get ||H_inf|| = (C_s/C_p)/(1-L*C_s*w_s^2), but in my equation re-arranging I can't seem to find a way to replace the L*C_s term with w_inf and R_inf. Am I missing something here?
I am with you now for your VOC formula. Your ISC looks very close to where I am stuck with the following differences: - a couple sign differences, I think this is mostly because I am using all w_s instead of s. Since this came from magnitudes I don't think Isc should have any imaginary parts. - I still have a V_g term from my original VOC formula.
I agree that I am stuck as to how to express it in the desired terms. The term I am trying to reduce is C_s w_2/(1-w_s^2*L*C_s).
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9 comments:
Good point, this is one of the (very) few remaining typos in the book. This should say: sqrt(L/(Cs||Cp))
Hello All,
For problem 19.1 a, I wonder how Rinf is being used ? For my VOC equation I get:
VOC = Vs/(1+Cp/Cs) / ( 1 + Ls * Cs||Cp s^2 )
= Vs/(1+Cp/Cs) / ( 1 + s^2/winf^2 )
then for my Isc I use formula:
Isc = VOC / Zoo
given Zoo = (jXs||jXp)
Final form of my Isc is:
Isc = s*Cs / ( Ls*Cs*s^2 + 1)
I am stuck on how to represent Isc in term of n,Vg, and F with this form.
Thank you
Tanto,
Could you explain where you got your VOC equation? I am using the ||H_inf||||v_si|| equation, and using a voltage divider as in class for ||H_inf||.
I get ||H_inf|| = (C_s/C_p)/(1-L*C_s*w_s^2), but in my equation re-arranging I can't seem to find a way to replace the L*C_s term with w_inf and R_inf. Am I missing something here?
Hello Audrey,
The annotated lecture note on Mon (Feb 3) slide # 10 describes how Hinf is being derived.
Sorry, I mean Mon (Feb 1), lecture # 9 slides (annotated).
Tanto,
I am with you now for your VOC formula. Your ISC looks very close to where I am stuck with the following differences:
- a couple sign differences, I think this is mostly because I am using all w_s instead of s. Since this came from magnitudes I don't think Isc should have any imaginary parts.
- I still have a V_g term from my original VOC formula.
I agree that I am stuck as to how to express it in the desired terms. The term I am trying to reduce is C_s w_2/(1-w_s^2*L*C_s).
Isc=Isc(n,Vg, R_inf and F):
The idea is to express each of these terms: Cp, Cs and L as the function of R_inf, n, f_inf and than plug it back into the equation.
For Isc, note that the following:
Isc = Voc/Zoo = Vs1*Hinf(jws) / Zoo = Vs1/Xs (see slide 11 of the design lecture)....
The trick is to transform Xs in terms of those variables.
I'm working on it....I'm a little behind because I was on business for 2 days.
Might as well contribute to this blog a little..
I think I figured out Isc...the key is getting what L is equal to as a function of w_inf and R_inf (w_inf derived from f_inf)
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