Solving Diode Equation for Current?

[physics_197]

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

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.

 

[physics_197]

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.

 

[Mark44]

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

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.

 

[Mark44]

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.

 

[physics_197]

No, I'm talking about just I. So how would I go about finding it?

 

[zoki85]

No, I'm talking about just I. So how would I go about finding it?

Using numerical methods

 

[physics_197]

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? I am 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?

 

[physics_197]

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)

 

[Mark44]

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? I am 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.