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by TheFallen
13 Feb 2018, 07:32
Forum: Related Hardware
Topic: High Power VESC
Replies: 71
Views: 17543

Re: High Power VESC

Got round to playing with my driver shim last night! https://lh3.googleusercontent.com/nwGG6vvn-EaOtgPpk_4Kzr4yVVuxn1CR3j0_XRj6YxqBXp66TJ2RV24H-yKgGtzJxfO2a1DqjGljNqC4ysNXzXOAzej20sDzW50GY08fKsErHt9XS-1Alae-zZaCm9NvnlfWgTlWDynAd_gHfRmJVsEZoJmObOrdPojY6N3k4bWMElRsIRXmsJrL1o3iB-D_wTUHwixvCD8bEC26s5HtF...
by TheFallen
24 Jan 2018, 09:05
Forum: Hardware Problems
Topic: mosfet caps missing?
Replies: 3
Views: 136

Re: mosfet caps missing?

I see on this schematic they are electrolytes, but on vedder schematics I don't see any electrolytes near mosfets. So are ceramics as good as electrolytes? Is it ok to use ceramics instead of electrolytes? On the example schematic there are 2x 220uF electrolytic capacitors and 3x 2.2uF ceramic capa...
by TheFallen
09 Jan 2018, 19:38
Forum: Related Hardware
Topic: High Power VESC
Replies: 71
Views: 17543

Re: High Power VESC

Whey! Time for an update! So to combat the distance between the MOSFET gates and gate drivers I've designed a gate driver shim. Its a small PCB that puts the gate driver chips (UCC27211DDA) as close to the MOSFET gates as possible. The board is designed to fit on my IMS power stages I've mentioned h...
by TheFallen
09 Jan 2018, 09:13
Forum: FOC
Topic: DRV8302 faults with FOC
Replies: 25
Views: 10088

Re: DRV8302 faults with FOC

Providing you've bought a recent VESC it'll probably have the required capacitance already fitted.
by TheFallen
05 Jan 2018, 16:05
Forum: Hardware Problems
Topic: DRV fault code on FOC detection
Replies: 9
Views: 1443

Re: DRV fault code on FOC detection

Also question for caps and 60V is in place - can we get answer for this? Is it meant that we beef up caps if we use more than 60V ? The DRV8302 has an ABSOLUTE MAXIMUM rating of +65V so regardless of how high the caps are rated anything more than that and the DRV8302 will be damaged. Of course reme...
by TheFallen
05 Jan 2018, 15:54
Forum: Hardware Problems
Topic: mosfet caps missing?
Replies: 3
Views: 136

Re: mosfet caps missing?

are capacitors on mosfets between +60V and GND intentionally let out? The caps aren't missing, see: C1, C8, C9, C37, C40, C51 on page 7 of the v4.12 schematic. There's also the highly recommended external capacitor assembly that many VESCs come with. Can't help with the single logic/power count con...
by TheFallen
04 Jan 2018, 08:50
Forum: Hardware Problems
Topic: DRV fault code on FOC detection
Replies: 9
Views: 1443

Re: DRV fault code on FOC detection

The low-side sense resistors raise the 'GND' to ~60mV which would offset the non-sensing FET gate. This may cause DRV upsets. I don't know for sure but it kinda works now.
by TheFallen
03 Jan 2018, 16:56
Forum: Hardware Problems
Topic: DRV fault code on FOC detection
Replies: 9
Views: 1443

Re: DRV fault code on FOC detection

I believe the resistor is connected like that so that the current path goes via one of the sense resistors.
by TheFallen
29 Dec 2017, 21:59
Forum: Hardware Problems
Topic: VESC DRV8302 Problems MOSFET Swapping Considerations to all!
Replies: 14
Views: 1522

Re: VESC DRV8302 Problems MOSFET Swapping Considerations to all!

@TheFallen: do you know if the VESC from Ebay (with all FETs on one side) works well ? The layout seems strange to me with the 3 output wires very near to STM32, and the shunts opposite side of pcb than incoming dc power.. I've had 4 of them running C80100s very nicely. I've not extensively tested ...

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