Feature Request: Loss free resistor

[EmergencyTemporalShift]

https://en.wikipedia.org/wiki/Loss_free_resistor
Loss free resistors are a type of resistor that feed power back into their source instead of dissipating it as heat. An example circuit and internals would also be nice to have.

[pfalstad]

You filed an issue about this already: sharpie7#555

I used a VCCS to model it: https://tinyurl.com/yanxq2z5

[EmergencyTemporalShift]

My bad, I thought I did, but forgot there were two forks when I didn't find it.

[EmergencyTemporalShift]

I still think it deserves a place in the index with a little blurb though, it's educational.

[EmergencyTemporalShift]

I used a VCCS to model it: https://tinyurl.com/yanxq2z5
Is the capacitor supposed to gain more charge over time? Is it because there is no real load? I might just not understand the concept well enough.

[pfalstad]

I think so. The capacitor stores all the energy that was drained from the source.

[EmergencyTemporalShift]

And how do you tune the "resistance"?

[pfalstad]

The output function of each controlled source includes a 1000 in the formula.. Change this to the resistance you want

[EmergencyTemporalShift]

I'm trying to make the resistance adjustable, but I just get a singularity error. https://tinyurl.com/2alykrwt Is this a problem with the implementation or my circuit?

[pfalstad]

replace c with max(c, 1) in the first controlled source and replace e with max(e, 1) in the second. The problem is that c/e are zero in the first iteration, so the current is infinite.

[pfalstad]

It looks like you're trying to use the energy in the cap for something, which won't work with a VCVS output. This works better:

https://tinyurl.com/25hw4gt5