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Forum Index : Electronics : Successful Nano Test

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InPhase

Senior Member

Joined: 15/12/2020
Location: United States
Posts: 178
Posted: 04:00am 17 Jun 2022
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I solved my blow up problem from the thread "MOSFETS and Motors". Turns out that the slight differences in timing between opto FET drivers makes it a bad idea to try and use them in parallel. I went back to the drawing board and pulled out my old prototype and designed a PCB to carry four parallel FETs fed from a totem pole transistor pair, driven by an opto driver. I also made an overkill isolated bipolar FET power supply board. It gives me +12V and -5V for gate drive. Also, each power supply feeds a PC817 optocoupler. The outputs are in series with the nano switch so that if any supply fails, it locks the nano off. Seems to work good so far. I've reached the limit of the DC supply I use to test in place of batteries, about 1 kW. Here's some pics. Ignore the jumbled up mess of wires
 
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