Skip to main content
C
Cornel19-Tanzanite
19-Tanzanite
May 24, 2024
Question

Electrical Engineering Challenge #4

  • May 24, 2024
  • 2 replies
  • 4386 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 29, 2024

Quite interesting. You may call it a bug and report it to PTC support and wait what they say.

 

I had success by providing guess values for V2 and V3 depending on t but I would not dare to say that this is a general solution.

Werner_E_1-1717002942556.png

Werner_E_2-1717002968632.png

 

 

 

Terms & ConditionsAccessibility statement