Algebraic loop problem

[Kilmore]

I tried to model following two equations in Simulink but it says (correctly) there is algebraic loop there. I need i3 to calculate di2/dt, but i3 needs di2/dt to be calculated... What to do about it? Thanks for any help.

L di2/dt + (R1+R2) i2 + 1/C1 int(i2)dt + R1 i3 + 1/C1 int(i3)dt = u

R3 i3 + 1/C2 int(i3)dt - L di2/dt - R2 i2 = 0

 

[IRstuff]

Schoolwork is not allowed

TTFN

FAQ731-376

 

[Kilmore]

It is not schoolwork for I do not ask anyone to actually do the whole work for me. I just wish to know how to react in such situation when algebraic loop occurs. Usual school examples are plain and do not involve any problems of this kind.

 

[IRstuff]

I'm not sure why you're calling a system of differential equations an "algebraic loop."

I suggest that you read the help file on how to set up solutions to differential equations.

TTFN

FAQ731-376

 

[Kilmore]

You are funny.

 

[Phaneas]

How did you model that? it shouldn't be a problem if it is made correct