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No problem – I’m an engineer, and if the design isn’t verified, then by definition it is defective. Or something else I do a lot is only test one or two phases at a time by playing with the source code – this way you are reducing the amount irfl410 things you are trying out for the first time and all at once.

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But I wonder if it’s flowing some other way Last edited by wrobinson on Aug 09 2: In this layout, I was more concerned with reducing loop area inductance than I was with the ground loop associated with the drop across the ground plane. The only difference being that I’ve modified the driver stage to use the IR Mosfet drivers.

You do not have the required permissions to view the files attached to this post. Has anyone encountered anything like this before, or anyone have any insight as to what might be going on.

Up to that point, I had just been going with hand drawn schematics, and when posting the question, I wanted to have something a little nicer to refer to. Double check your layout.


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I am in fact using the IRF Bwhich is good to A derating notwithstandingper the datasheet, and comes in your usual TO package. But in the meantime, I’ll be eatasheet up the design then the layout. I’d orfl4310 like to know what it flowing back into the controller though if in fact something is. All books are in clear copy here, and all files are secure so don’t worry about it. I just haven’t gotten to that point yet. OK, to take a step back and answer the questions from earlier What am I missing?

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Now, I have NOT plugged the motor in yet. Any feedback would be appreciated! I’m actually in between oscilloscopes.

Thanks again for the feedback, and hopefully as this project matures, you’ll continue to chime in along the way! To monitor the phases, I just use a bank of LEDs – which works just fine, and actually is more informative for what I’m doing that a dual channel scope. After that, I plug in the MOSFET board, and apply 36V to it – but it isn’t plugged into the bike just yet, and it at this point, it seems that everything is still fine.


We were having a irfl4130 last summer, and dataaheet 2 little kids in toe, and no big projects on the horizon, I decided to let go of my 20 MHz scope, and start looking out for a nicer one – digital storage type deal, Mhz or so.

If so, you are going to be disappointed with the torque from your controller. If the current is somehow flowing back into the PIC that way, that should block it.

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The idea was to get it running adequately – to urfl4310 me to lay a PCB out confidently, knowing the breadboard works – and take care of the grounding issues at the PCB stage.

I can’t see why anything should happen if all the FETs are inactive when you plug the motor in and stay that way as they should. Do I have the right part? I’m sure you know the drill.

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It’s not that I haven’t been cognizant about it up to this point, I just hadn’t expected such a large problem. Your point is well taken, and I think the ground loop is likely what’s causing me so much grief.

As well it killed 2 outputs lines on the PIC.

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