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6 Posts authored by: jc2048
jc2048

Programmable Load Build

Posted by jc2048 Aug 31, 2018
Introduction   This blog is to document my attempt to build Jan and Peter's load. I'm trying to catch up with Jan, who is currently way ahead of me, so I can start doing measurements.   Although I normally prepare blogs in full before posting them, this time, as an experiment, I'm going to do it differently and blog as I go along, with the blog gradually accumulating (accreting?) over time. It will be a bit rough-and-ready and unpolished, but perhaps give a better flavour of the p ...
This series of posts relates to the work of  jancumps and  peteroakes in their WIP Programmable Electronic Load  blog.   In this post I'm going to look at stability and the way we might get some measure of how good it is other than looking at the step response as I did in the earlier blogs. I did a post in the WIP blog on stability, so I'm repeating myself a bit, but it seems sensible to go through it again before adding a bit more about interpreting the features of the ...
This series of posts relates to the work of  jancumps and  peteroakes in their WIP Programmable Electronic Load  blog.   In the previous parts, I looked at the effect of changes to the control input. Now I want to look at the effect of holding the control input constant and varying the voltage of the output. That change of voltage will result in the circuit having to vary the resistance of the MOSFET, to compensate and bring the current back to the desired value, and t ...
In this post I'm going to look at the effect of inductance in the output circuit that the load is controlling.   Although you may not be specifically driving an inductor, the leads that you use have some inductance and this will have some effect on the the performance and stability. Why might the inductance have an effect? Although it's not inside the loop, the current in the circuit also passes through the sense resistor and that is inside the loop.   For this simulation I've placed ...
In this post, I want to look at the circuit as a servo loop.   At this point I probably need to throw in a bit of theory (which I don't understand all that well). This is going to be fast and furious and won't cover the ground in the way that an expensive textbook would (but then I'm not qualified to write a textbook). Servo loops can be numbered according to type. A type 0 loop (a regulator) simply generates an error term which is the difference between the desired output and the current ...
I was previously doing these posts as part of Jan Cumps' WIP Programmable Electronic Load  blog, but that's now so extensive it's getting quite cumbersome to work with and, since this is all of fairly general interest, I thought I'd carry on with separate blogs rather than pile everything into the one container. This way it will be possible to have comments with each piece, rather than them getting tangled up in the way they do with a very long blog, and it will keep them from confusing all ...

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