19-Tanzanite

Question

Electrical Engineering Challenge #4

Forum|Forum|2 years ago
May 24, 2024
2 replies
4541 views

Hi,

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

Assume Initial voltage of C1 = 0V

C

Cornel

Author

19-Tanzanite

1_Untitled-4_MCP9.zip

C

Cornel

Author

19-Tanzanite

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

C

Cornel

Author

19-Tanzanite

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:

1_Untitled-4_MCP9.zip

ttokoro

21-Topaz I

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.

t.t.

C

Cornel

Author

19-Tanzanite

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

With odesolve block does not work:

Whit this method work...:

1_Untitled-4_MCP9.zip

W

Werner_E

25-Diamond I

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:

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