topic Re: Circuit equation with PRIME7 in Mathcad

Circuit equation with PRIME7

ssato — Mon, 22 Mar 2021 05:41:37 GMT

Hello everyone

I attached tow work sheets with PRIME7.

I was very surprised about I1 ...

Is this a bug? Or is this joke?

Re: Circuit equation with PRIME7

ttokoro — Mon, 22 Mar 2021 06:23:33 GMT

I want to know the electric circuit that you want to solve. Including the points with voltages and current flows of the elements.

Tokoro.

Re: Circuit equation with PRIME7

ssato — Mon, 22 Mar 2021 07:19:12 GMT

Hello ttokoro san

I attached circuit diagram and some equations.

I have been able to obtain I1, V2 and V4 from the file "sample1" I attached earlier.

I have two questions.

1. V2 remains in the solution of I1 called from SLOVE.
2. The only difference is where SOLVE calls I1.

The solution is different when symbolic I1 is called again.
The solution of V2 is substituted into one of them to obtain the solution of the equation.
On the other hand, V2 remains.

Re: Circuit equation with PRIME7

ttokoro — Mon, 22 Mar 2021 07:54:37 GMT

Re: Circuit equation with PRIME7

-MFra- — Mon, 22 Mar 2021 11:11:53 GMT

Re: Circuit equation with PRIME7

LucMeekes — Mon, 22 Mar 2021 13:04:12 GMT

How about:

The circuit presents itself as an impedance to the voltage source. That impedance is:

Success!
Luc

Re: Circuit equation with PRIME7

-MFra- — Mon, 22 Mar 2021 13:21:47 GMT

The circuit is an Antoniou inductance simulator. In fact, the result gives an impedance proportional to CR² which dimensionally is an inductance (FΩ² = H).

Re: Circuit equation with PRIME7

ssato — Mon, 22 Mar 2021 22:50:28 GMT

Hello MFra san

Thank you for your advice.

I assume V1 is the source voltage and a known constant.

So I think I1, V2 and V4 are unknown and can be solved by three equations.

In fact, Ver. 15 gives 3 unknowns without problems.

It looks like a PRIME 7 problem.

Re: Circuit equation with PRIME7

ssato — Mon, 22 Mar 2021 23:54:00 GMT

Hello everyone

This circuit operates as an inductance"L" when an ideal operational amplifier is used.

L=C1*R1*R3*R5/R4

Re: Circuit equation with PRIME7

ssato — Tue, 23 Mar 2021 00:27:59 GMT

Hello LucMeekes

Thank you for your response.

But your solution V1/I1 seems to differ somewhere...

I have been able to obtain I1, V2 and V4 from the file "sample1" I attached earlier.

I have two questions.

1. V2 remains in the solution of I1 called from SLOVE.
2. The only difference is where SOLVE calls I1