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vedder.se forums • High Power VESC - Page 4
Page 4 of 8

Re: High Power VESC

Posted: 21 Jan 2017, 18:07
by TheFallen

Re: High Power VESC

Posted: 21 Jan 2017, 19:29
by arvidb

Re: High Power VESC

Posted: 21 Jan 2017, 20:04
by arvidb
Another idea: pull HS to ground (through a resistor) to manually charge the VHB cap. What happens?

Re: High Power VESC

Posted: 21 Jan 2017, 20:20
by TheFallen

Re: High Power VESC

Posted: 21 Jan 2017, 21:19
by arvidb

Re: High Power VESC

Posted: 21 Jan 2017, 21:40
by arvidb
What voltage was Vcc at when you did the measurements in your first post about this problem? I'm wondering if there could be a problem with the C driver that makes it source Vdd current from HS, and maybe, if Vcc was not connected but you have something else on your board that loads Vcc, that something could sink that same current? Edit: nah, strike that, then the motor would not have to be connected for Vdd to go down to 1.2 V...

Re: High Power VESC

Posted: 22 Jan 2017, 06:51
by lizardmech
I just finished my ucc27211 based controller. It works, HB and HO remain at 1.8V when it's not running.

Re: High Power VESC

Posted: 22 Jan 2017, 09:49
by rew
For static measurements, I would recommend putting a 1k resistor on each phase to ground. This makes it possible for the high side drivers to charge their boost capacitors. The voltage at "HS" would otherwise be undefined. This allows it to float to any value. Even a small leakage current could cause the voltage to drift up or down.

Double check your mosfets. When they are connected there are 12 measurements that reasonably quickly give a good indication of that they are still good: put the multimeter in beep/diode position and measure from each phase to each of the power supply leads. Now turn the multimeter around (swap red and black) and do it again. You should NEVER get a beep, and "open circuit" in half the measurements and a diode drop in the other half. My mosfets measure about 420-440mV. (I don't remember exactly, just that it was in the 400's That's good enough...)

A slighly more advanced measurement will also check that the gate is free to do as it pleases. Open circuit to the source in both directions.

I suspect your C-low mosfet might be shorted. Possibly not now, but in the past and it might have blown up your driver.

Re: High Power VESC

Posted: 22 Jan 2017, 18:25
by TheFallen

Re: High Power VESC

Posted: 25 Jan 2017, 21:38
by TheFallen