Kerrowman
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Common garden variety mosfets have a maximum voltage rating, if exceeded the device breaks down destructively almost always to a permanent dead shorted condition.Are avalanche fets just beefier and more resistant to transients than others?
Thanks for confirming my assumption about battery voltage. This also suggests that the FETs are killed by gate overvoltage, due to parasitic effects of the swap relay circuit. TVS diodes across gate-source terminals should be sufficient to avoid this specific problem, not talking about other possible circuit issues or general usefulness.Yes when the spikes meet the battery they are no longer measurable. The suggestion that it’s the relay cross over that brings the problem sounds very feasible and so I guess using avalanche rated devices would help with that.
Yes these are my postsSome additional hints about purpose of the apparateous and design details can be found in previous threads
https://www.edaboard.com/threads/fet-driver-design.399904 https://www.edaboard.com/threads/extracting-energy-from-a-rotor.400541
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