Gregory's ServerSuccess, the output waveform of my 8/20 μs impulse generator prototype is now IEC 61000-4-5 compliant!
Peak current: 200 A
Front time: 7.05 μs
Duration: 21.24 μs #electronics
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6 comments
 New plan: abusing a MOSFET gate driver to drive a SCR's gate to get high-side switching. Now I need to figure out how much Common Mode Transient Immunity do I need. My circuit is *literally* a surge generator. #electronics Rewired the isolated DC-DC converter to float on top of the high voltage instead of ground. No more explosions, even a small-signal transistor can drive the gate with ease. #electronics Look at my gate turn-on waveform... Man-made horrors beyond comprehension. #electronics In electronics, everything is an LC resonator if your layout is bad enough. #electronics |
The only problem I need to solve now is that the entire circuit exploded after firing the first shot. ⚡💥 I believe it was the same mistake and failure mode - the thyristor was wired as a high-side switch this time deliberately for convenience. As soon as the thyristor is turned on, the gate voltage rises to 500 volts.
I thought the transistor was protected by the new diode I added in series, but no, it's again a n00b mistake. The base-collector junction of a BJT is also a diode, and you can't connect any diodes in series without an RC snubber to balance the voltage. Without balancing, series diodes simply break down one after another. #electronics
The only problem I need to solve now is that the entire circuit exploded after firing the first shot. ⚡💥 I believe it was the same mistake and failure mode - the thyristor was wired as a high-side switch this time deliberately for convenience. As soon as the thyristor is turned on, the gate voltage rises to 500 volts.