Hello, I had a problem today with three MOSFETs 2SK1212. I have a chopper and everything is working perfectly, my triggering circuit with the optocoupler, the trhee phase diode bridge with the filters, but when I connect the transistor it starts up closed, I mean i don't have a DC controller because the switch is not working. I had a problem with the first one and it was that when I connected the Vgs control signal it went to zero, I realizaed that the transistor was damaged with the static charge, then I tried with a new one and the control signal kept "intact" that was when I connected it to the chopper and powered it but it started up closed, I tried and tried and finally changed it for a new one and it did the same, they walways start up closed, and I never conected it to the Vgs control signal.
That doesn't make any sense to me, I think they came damaged, if you have a different explanation for this a would really appreciate it, actually I would appreaciate any help. I made all the tests withouth any load, in the simulation I used a 100 Ω Load to test the current.
That doesn't make any sense to me, I think they came damaged, if you have a different explanation for this a would really appreciate it, actually I would appreaciate any help. I made all the tests withouth any load, in the simulation I used a 100 Ω Load to test the current.