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Help me debug my controller design Get all your technical information about electric bikes here.

(PDF) IRFL4310 Datasheet download

irrl4310 The one that I’m designing is based directly on one by Microchip http: The only difference being that I’ve modified the driver stage to use idfl4310 IR Mosfet drivers. Everything works as expected in that datashee I’ve got my hall sensors plugged into the PIC microcontroller, the right control lines toggle at the output pins of the chip.

Next, I plug in the IR, as shown in the schematic, and again it behaves as you’d expect. 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. As ddatasheet it killed 2 outputs lines on the PIC.

Has anyone encountered anything like this before, or anyone have any insight as to what might be going on. I’d have expected the IRs to act as a buffer, but alas that doesn’t seem to be the case Any feedback would be appreciated!

You do not have the required permissions to view the files attached to this post. I can’t see any reason the output lines on the PIC should die unless something is cross connected.

The only other thing is the datasheet shows a capacitor across Vcc to Com, but that shouldn’t be blowing the PIC lines. Double check your layout. Make sure the bootstrap diodes datasehet blown. I should have mentioned They are datahseet my board, I just left them off the schematic for now, it’s a work in progress Do you have a scope to check the signals to be sure?

I can’t see why anything should happen if all the FETs are inactive when you plug the motor in and stay that way adtasheet they should. Find three hefty resistors maybe around 10ohms or so, along with some good sized inductors to eatasheet with them around uH or soand use them instead of your motor to do tests. Or something else I do a lot datazheet only test one or two phases at a time by playing with the source code – this way you are reducing the amount of things you are trying out for the first time and all at once.


I’m actually in between oscilloscopes. We were having a yardsale last summer, and with 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 datzsheet, Mhz or so. I just haven’t gotten to that point datasheeet. Anyway, I’ve been making do with what I’ve got around the house for now.

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. Now, I have NOT plugged the motor in yet. I’m thinking about adding in some diodes in between the PIC outputs and the IRs to block any reverse current. If the current is somehow flowing back into the PIC that way, that should block it.

But I wonder if it’s flowing some other way Anyway, thanks again for the replies, any other ideas would be a real help. I put in some diodes inline with the PIC outputs, and fired up the motor. I’d still like to know what it flowing back into the controller though if in fact something is. But in the meantime, Datxsheet be finishing up the design then the layout.

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Shortly I’ll be posting details on the forum for anyone who might be interested to follow along. Thanks again for your help. And if anyone has any other ideas as to what was going on, please chime in! Do I have the right part?

IRF datasheet (electronic components) search result | eet

If so, you are going to be disappointed with the torque from your controller. What am I missing? I cobbled that schematic together really quickly yesterday morning before I made the post. 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.


I am datashert fact using the IRF Bwhich is good to A derating notwithstandingper the datasheet, and comes in your usual TO package. So again thanks for the catch, and I’ll be updating the schematic before I repost! No problem – I’m an engineer, and if the design isn’t verified, then by definition irfk4310 is defective. I’m sure you know the drill.

Last edited by wrobinson on Aug 09 2: OK, to take a step back and answer the questions from earlier Regarding the star grounding on the low side of the MOSFET board, my original double sided PCB datqsheet did actually use a star configuration for the returns on the gate drivers. At the time, the board was half the length of this board the MOSFETs were basically back to back with a slab of aluminum to pull the heat away sandwiched between themand I went with a star point because ircl4310 was easy to run the driver line to the return line because everything was so close.

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. Your point is well taken, and I think datasheef ground loop is likely what’s causing me so much grief. The plan right now is to make a few changes to my setup in it’s current configuration – because it is running at the momentand once I’ve got my parts chosen and firmware firmed up, I’m going datqsheet re-layout the entire board, with more emphasis on the grounding irdl4310.

It’s not that I haven’t been cognizant about it up to this point, I just hadn’t expected such a large problem.

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

Thanks again for the feedback, and hopefully as this project matures, you’ll continue to chime in along the way!