Short circuit problems

WHAT A BAD START TO THE DAY...

after running the motor fine for a while it seemed to lock up after I accessed the .bit part of the watch window.

I added pulldown resistors between the phase and the top side gates as Bryon suggested to ensure that a stray voltage does not turn on the gates.

That has not solved the problem.

I have reset the CPU and emulator in the hope that it is a latch up in the DSP. I thought that reset was done each time a program was downloaded so this should not help.

As expected that did not help. I will try a power down of the DSP and then a reset..

As expected, that also did not help...

I will try one of the old programs, following that I can be sure that it is a hardware problem. I wanted to rule out all software problems first as hardware trouble shooting is difficult when the power supply is current limiting as nothing (ie gate drivers, MOSFETS) gets its correct voltage.

Tried afm_060103b.mdl with no luck - definetly have to check hardware.

The short exists with neither the motor or the interface board connected so it cannot be softwatre.

There does not seem to be a short between any of the phases and a rail which suggests that it is not a mosfet problem. To be sure, I will remove each of the gate drivers.

Still problems, removed IR2175 as well with no results.


I discovered I missed that phase C' had a short across the phase - dead MOSFETs. Not sure why but on replacement the problem is gone. Hopefully the pulldowns on the gates will stop this happening again.

now that is working, I am going to have a break from this controller and have a go at sorting out the e-bike controller