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C
Cornel19-Tanzanite
19-Tanzanite
May 24, 2024
Question

Electrical Engineering Challenge #4

  • May 24, 2024
  • 2 replies
  • 4382 views

Hi,

Cornel_1-1716544865826.png

Assume if needed this type of eq for current through diode D1:

Cornel_1-1716544415511.png
Assume Initial voltage of C1 = 0V

2 replies

C
Cornel19-TanzaniteAuthor
19-Tanzanite
May 27, 2024

Cornel_2-1716825713989.png

 

Cornel_3-1716825723736.png

C
Cornel19-TanzaniteAuthor
19-Tanzanite
May 28, 2024

So, any idea why this system of differential equation cannot be solved with odesolve? @Werner_E 

C
Cornel19-TanzaniteAuthor
19-Tanzanite
May 28, 2024

So, even if I removed V4(t) to make it more simpler to the first one from above firstly, but still odesolve cannot solve system giving the same error with missing some of the initial condition:

Cornel_2-1716878981290.png

 

ttokoro
21-Topaz I
ttokoro21-Topaz I
21-Topaz I
May 28, 2024

The time constant of C1*R3 and C1*R4 are o.1 s. This plot shows DC 10 V application of your circuit. 

Next two pictures are iCircuit results of initial and after few seconds.

Capacitors voltage V3-V4 is about 3.2 V.

At first, v3=v4,capacitor shorts the circuit.

After few seconds, V3-V4=2.8 V at second picture....Weit more it becoms 3.2 V. 

This is not LTI system and my Mathcad sheets with solved by Laplace transform can't used to solve this system.

 

image.pngIMG_1018.PNGIMG_1019.PNG

t.t.
C
Cornel19-TanzaniteAuthor
19-Tanzanite
May 28, 2024

@ttokoro @Werner_E 
Then...look at this..

With odesolve block does not work:

Cornel_3-1716889679638.png

 

Cornel_0-1716889579148.png


Whit this method work...:

Cornel_1-1716889611261.png

Cornel_2-1716889621380.png

W
Werner_E25-Diamond I
25-Diamond I
May 28, 2024

odesolve expects ODEs and an initial condition for any function an derivative you solve for.

You don't provide an ODE for V2. Prime can't solve equations or system of equations of functions (with the exception of ODEs).

So nobody has claimed that Prime can solve any problem but you can feel free to add a feature suggestion in the "ideas" section of this forum if you fell better doing so,

The last problem you showed could easily be solved that way:

Werner_E_0-1716891809977.png

 

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