I've been trying to filter ESD spikes using caps, ferrite beads, TVS diodes, capacitors, and schottkys but haven't succeeded. Details:
I was told that using a modified BBQ lighter (has a piezoelectric spark generator) was a good way to simulate the ESD testing needed for CE compliance.
I am powering a commodity motherboard from a commodity power supply that is in turned powered by a +32V input. When I generate a spark on the +32V input (or the GND) the motherboard reboots or locks-up.
I CANNOT mechanically prevent the +32V/GND from being exposed to the ESD spark due to the design of the device. I MUST find a way to filter the ESD spark so the power-supply doesn't see it.
Because my device is battery powered, I can't rely on the presence of an earth ground either. So I need to somehow filter a spark (crosses a 1cm air gap in 30% humidity) so that the power-supply (and everything downstream) sees only 32V DC.
Everyone tells me this is a black-art and that even a sufficiently fast scope (1GHz+) won't be much help in designing a solution.
I'm hoping some of you "wizards" can give me a starting place to address this "black art" since right now I'm just trying random components I have lying around with little luck :)
TVS, Varistor, Sideacter, MOV, MLV, caps, and in what combo? I know its trial and error, but having a good place to start could speed things up immensely!