Solving Diode Equation for Current?

  • #1

Homework Statement



I need to find the current, but not sure how to rearrange the equation because of the I in the exp.

Homework Equations



wmbeyd.png


The Attempt at a Solution



Thanks, just need to be pointed in the right direction. Seems like I will either be in ln or exp.
 

Answers and Replies

  • #2
Also, just a follow up question, the diode ideality constant... Is there a way to solve for it? My notes just say its between 1 - 1.5, Should I just assume its 1? The manufacturers data sheet does not mention a value for this.
 
  • #3
35,284
7,124

Homework Statement



I need to find the current, but not sure how to rearrange the equation because of the I in the exp.

Homework Equations



wmbeyd.png


The Attempt at a Solution



Thanks, just need to be pointed in the right direction. Seems like I will either be in ln or exp.
Because I appears on its own and as the argment of the exponential, you can't solve for it using elementary operations.
 
  • #4
35,284
7,124
Also, just a follow up question, the diode ideality constant... Is there a way to solve for it? My notes just say its between 1 - 1.5, Should I just assume its 1? The manufacturers data sheet does not mention a value for this.
Are you talking about I0? That one you can solve for.
 
  • #5
No, I'm talking about just I. So how would I go about finding it?
 
  • #6
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224
No, I'm talking about just I. So how would I go about finding it?
Using numerical methods
 
  • #7
Thank you, I used newtons method on matlab, I think it should be correct :)

Also, do any of you have an idea about the diode ideality factor? Im trying to model a PV module in Matlab and the data sheet does not mention this. I read online that people tend to assume its just 1... Any ideas?
 
  • #8
Nevermind!! After running through the code using different values (between 1 and 2), There is no difference in terms of the current... well either, it can be neglected or my code is wrong (I tried entering a large number, that affected the current)
 
  • #9
35,284
7,124
Thank you, I used newtons method on matlab, I think it should be correct :)

Also, do any of you have an idea about the diode ideality factor? Im trying to model a PV module in Matlab and the data sheet does not mention this. I read online that people tend to assume its just 1... Any ideas?
Which variable is the diode ideality factor? That's what I was asking about in post #4.
 

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