Electronics > Projects, Designs, and Technical Stuff
High voltage relay for ESD simulator
fcb:
I can't justify buying an NSG 435 https://www.teseq.com/products/NSG-435.php (Schaffner/Teseq), and I haven't seen any on eBay. So I'm building one.
The high voltage generator, and 'discharge network' are within my capability. But I'm stuck on the 'relay' that connects the output of the discharge network to the tip.
So with an ESD simulator there are two main types of event you simulate:
1. air discharge
2. contact discharge
With the air discharge you (rapidly!) approach the DUT target area with the tip of the simulator at it's charged potential (upto +/- 15kV) and the idea is that discharge will find the nearest weak spot and discharge.
With the contact discharge you put the tip of the simulator on the DUT target area (e.g. the metal back-shell of a connector) and pull the trigger. This closes the relay and injects your ESD event into the DUT.
I can see how I could use a high-voltage relay in the first case, as current wouldn't (or at least minimal current) be flowing at this point. But in the second case, I can only think that a spark would form across the relay contacts as the relay closes.
Anyone know how this is done?
gasmeter:
Hi
I'm looking at it too.
Did you come up with a solution ?
I think there are two ways I can think of
1/ is to use two relays like in this video https://youtu.be/RzUaV8E8mPA (my preferred method)
2/ The gun must be removed between each contact test.
Then it can simply be the capacitor that is charged and the relay is open before a test discharge ? Single relay solution
Not a good video but that's he appears to be doing here https://youtu.be/IrVvRWvVU5k
Peter
mikeselectricstuff:
--- Quote from: fcb on March 17, 2019, 11:17:00 am ---I can't justify buying an NSG 435 https://www.teseq.com/products/NSG-435.php (Schaffner/Teseq), and I haven't seen any on eBay. So I'm building one.
The high voltage generator, and 'discharge network' are within my capability. But I'm stuck on the 'relay' that connects the output of the discharge network to the tip.
So with an ESD simulator there are two main types of event you simulate:
1. air discharge
2. contact discharge
With the air discharge you (rapidly!) approach the DUT target area with the tip of the simulator at it's charged potential (upto +/- 15kV) and the idea is that discharge will find the nearest weak spot and discharge.
With the contact discharge you put the tip of the simulator on the DUT target area (e.g. the metal back-shell of a connector) and pull the trigger. This closes the relay and injects your ESD event into the DUT.
I can see how I could use a high-voltage relay in the first case, as current wouldn't (or at least minimal current) be flowing at this point. But in the second case, I can only think that a spark would form across the relay contacts as the relay closes.
Anyone know how this is done?
--- End quote ---
vacuum or SF6-filled relay
NiHaoMike:
Maybe use a thyratron or other switching tube?
Le_Bassiste:
you might try to stack MOSFETs in series up to the desired voltage (say, 15 x 1kV VDS rating for a 10kV switch), SMD mounted ones probably do the trick.
sounds silly? have a look at http://www.behlke.com/. that's exactly what they do. i had the pleasure to use those switches in an EMC Burst-tester design. they work like a charm and make for extremely good waveforms compared to the requirements layed out in the standards, albeit frikking expensive.
edit:
and there's of course also this kind of stuff:
http://www.stg-germany.de/products/high-voltage-reed-relays
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