Solve Thevinin Voltage with Dependent Sources - Thvenin Northon

[erezb84]

Suppose i want to find the Thevinin Voltage equivalent between points a and b,
but there are dependent sources in my circuit that depend on the current between points a and b, how should i work?

Thanks!

 

[gneill]

Suppose i want to find the Thevinin Voltage equivalent between points a and b,
but there are dependent sources in my circuit that depend on the current between points a and b, how should i work?

Thanks!

Put your own fixed current source, I, at a-b and use the usual analysis methods to find the voltage V that this current source must have across it while connected to the circuit. Thevenin resistance will then be V/I. Since you now know the Thevenin resistance, the output voltage V and current I, you can work out the Thevenin voltage that sits "behind" the Thevenin resistance to produce V.

 

[jegues]

Put your own fixed current source, I, at a-b and use the usual analysis methods to find the voltage V that this current source must have across it while connected to the circuit. Thevenin resistance will then be V/I. Since you now know the Thevenin resistance, the output voltage V and current I, you can work out the Thevenin voltage that sits "behind" the Thevenin resistance to produce V.

I can't quite remember, but this approach only works if the circuit consists of only dependent sources. (i.e. not a mix of independent/dependent)

Correct?

 

[gneill]

I can't quite remember, but this approach only works if the circuit consists of only dependent sources. (i.e. not a mix of independent/dependent)

Correct?

I would think that it would work in all cases (superposition theorem), but I am willing to be corrected. Can you give an example where it would not work?