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Re: No doubling measured

209.215.72.179

Posted by Jon Risch on July 18, 2000 at 19:09:10

In Reply to: No doubling measured posted by Ed Sommer on July 17, 2000 at 18:40:17:

In this particular application, there are capacitors on the output of these inductors. Some people put fairly large ones on the output side, and in my design, there are caps to ground.

This is where the differential spike or HF signal goes, and why it will end up doubling (again, not quite, but larger than the input).

There is also the issue of how far away the load is, and on a power strip/AC filter, it will be quite a distance away. Is is possible that very fast signals will hit the choke and generate the transformer action BEFORE the loop can fully close and allow the return current to come back through the choke. Since we are talking about AC power spikes, and some of these can be quite fast if locally generated, this is relevant to the discussion. I do know what I measured, and was initially surprised by it, and verified my set-up, the test conditions, and so on, as I was working with potentially lethal tests (the surge generator I was using could pop 40 watt light bulbs like flash cubes, sometimes they would explode, and they had to be under a plexiglass shield for testing), I had no desire to kill myself, so everything was checked VERY carefully.

If you are going to make a big thing out of this, it would behoove you to check out the referenced circuit that is under discussion:
http://members.xoom.com/Jon_Risch/surge.htm

My only point in bringing this up is that what appears to be OK on paper, or with casual DIY work, may have hidden pitfalls, and require more than the textbook approach in the final execution. I wished to point out to the DIYers that might wish to try Lukasz's variation that there was more to this than met the eye, and that proper inductors/cores would not require a common mode winding, that many CM types of chokes are not capable of very much differential current, and that my recommendation still stood for independant inductors to be used for maximum performance and protection.

Jon Risch

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