all home built solar system

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poida Guru Joined: 02/02/2017 Location: Australia Posts: 1464	Posted: 08:01am 01 May 2021         wiseguy said   .. But I had a totally different power stage. I used low impedance opto drivers with fast high current transistor buffers all on the same PCB avoiding the dreaded ribbon cable fiasco. All gates drives had a 2R2 and around 80mm of total track length. .. yup. Redesign the gate drive from the start. Probably the way to go. Earlier today I was dreaming of a one opto-gatedrive IC per FET design. All optos have tight bypassing caps and short as can be traces. And something like 5R gate resistors. Maybe gate shutdown diodes. SMD all the way. It's do-able. loop path lengths of the order of 10mm and probably less. I wonder how that would go... oh, and a +/- 12V floating supply. For a standard inverter power board I need 3 +/- 12V supplies. so that's $36 for the Recom RE1212 with +/- 12V output Maybe get away with 2. Optos for each FET $3.60 in packs of 5 if using FOD3182 Need 16, buy 20 in packs of 5. Prob, cheaper elsewhere than RS.. so a 4 x 4 FET power board will be $72 for the 3 Amp optos and $36 for the iso supplies I can afford that test. Give me a bit of time. heh, 10mm long loop. "yer dreamin mate.." more like a lot longer. Edited 2021-05-01 18:58 by poida