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Surge protection—Stop fried electronics

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TM123
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re: Surge protection—Stop fried electronics
TM123   8/15/2012 10:15:49 PM
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GREAT-Terry, A Bidirectional TVS is matched to provide performance in both directions - equally. A pair of Unidirectional TVS will provide protection but will not necessarily be matched to balance the intrusion levels either side of your supply or common rails. David Ashton, fair comment on the MOV front - our particular application is inside a pressure vessel and it takes a bit over a day to pump out the gas (SF6), purge and put in walkways to access the electronics. MOVs do work but are not appropriate in our situation.

GREAT-Terry
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re: Surge protection—Stop fried electronics
GREAT-Terry   8/16/2012 3:15:55 AM
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How about aiding the whole system with active clamp circuit like LTC4366? By using this kind of clamping device, the TVS can be smaller I think.

TM123
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re: Surge protection—Stop fried electronics
TM123   8/21/2012 11:59:47 PM
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There is a bit more to it than just shunting off surges/spikes. The article has addressed the Ohmic requirements, but what about capacitive and inductive effects. Depending on cable lengths, there will be some considerable capacitive coupling between conductors for the duration of the surge/spike. Also multiple conductors (presumably in the same cable/conduit/duct) will suffer from inductive coupling similar to a transformer - after all we are dealing with a changing Voltage/Current waveform i.e. ac - but only for restricted cycles (hopefully only one). Some care also needs to be taken to prevent these effect through the use of shielded cables and earthed at both ends, to transform a simple shielded cable into a faraday cage in an effort to reduce these other effects. This raises a can of worms because we now have the probability of earth loops. To protect we must make some compromises. I know I would rather deal with noise reduction rather than replace everything because it has been fried!

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