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'[EE] simulating ( emulating an indutive load)'
2007\02\06@152316 by

Hi Guys,
I have a control loop that has what the manufacturer calls a load
emulator, which is a combination of resistors and capacitors across the
feedback path of an op-amp. This is used on the first 5 uS after
switching as the feedback from the sensor measuring the current on the
load is to noisy.
The manufacturer claims that the modelling of the load with a certain
resistance and inductance in series can be done by using a circuit with
a certain resistance and capacitance in parallel and a circuit with a
certain resistance and inductance in parallel can be done by using a
circuit with a certain resistance and capacitance in series, is this
correct?
Best regards
Luis

piclist-bounces@mit.edu wrote:
> The manufacturer claims that the modelling of the load with a
> certain resistance and inductance in series can be done by
> using a circuit with a certain resistance and capacitance in
> parallel and a circuit with a certain resistance and
> inductance in parallel can be done by using a circuit with a
> certain resistance and capacitance in series, is this correct?

I believe this is called the "duality principle". Should be part of any introductory EE circuit analysis course, i would look to such a textbook for details. Its been years since i've looked at mine, and I can't recall ever actually using it except in class. There's a little bit more to it IIRC; you have to replace voltage sources by current sources, resistances by conductances, and swap inductance for capacitance.

That´s called a gyrator.

http://en.wikipedia.org/wiki/Gyrator

2007/2/6, Luis Moreira <Luis.Moreirajet.uk>:
{Quote hidden}

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