Troubleshoot my Electronic Load - part 1: MOSFET and Voltage Reference

RE: Troubleshoot my Electronic Load - part 1: MOSFET and Voltage Reference

Jan Cumps — Wed, 03 Jul 2019 16:36:42 GMT

spoiler alert: the load works again. I checked the controller board and all functions worked fine.

I connected it to the power board with the new MOSFET and back in business...

RE: Troubleshoot my Electronic Load - part 1: MOSFET and Voltage Reference

shabaz — Tue, 02 Jul 2019 20:44:23 GMT

Hi Jan,

I'm wondering if it could be ESD or inductance related perhaps. My ECU needed a MOSFET swap-out, that too had the 3-way short that you mention. In my case, it was going to one of the coils, that had clearly deteriorated. I'm guessing (can't be sure) in my case that a very high voltage was generated with nowhere to discharge, which killed the MOSFET. I could be totally wrong, I don't really know what killed it. I have the coil somewhere for a possible autopsy.

RE: Troubleshoot my Electronic Load - part 1: MOSFET and Voltage Reference

genebren — Tue, 02 Jul 2019 20:28:42 GMT

Jan,

That is quite a setback. I hope that you are successful in putting everything back together again. Hopefully there will be answers that can help you improve the design.

Gene

RE: Troubleshoot my Electronic Load - part 1: MOSFET and Voltage Reference

Andrew J — Tue, 02 Jul 2019 20:22:26 GMT

I shall follow your investigation with interest to see how you go about it. Hopefully get some insights for when I need to do it.