High Power VESC

Discuss hardware related to the VESC such as the NRF nunchuk.
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TheFallen
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Joined: 26 Oct 2016, 10:49
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Re: High Power VESC

Postby TheFallen » 09 Jan 2018, 19:38

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 here: viewtopic.php?f=15&t=505&start=50#p4330

I ordered them over the Christmas break and they turned up today:
Image

OSHPark are amazing. Also, free jellybeans! The boards are 2 layer, 1 oz, 120mm x 25mm x 1.6mm PCBs. Cost $23 for 3.

Image

I immediately started populating the passives whilst at work and I put the parts order in today. Thanks to work for their regular orders the parts should turn up tomorrow and I can finish soldering the boards and get them tested.

The largest change is the addition of a much much larger bootstrap capacitor on the gate drivers. Increased from 100nF to 4.7uF. I've also included the current sense amplifiers on the board. In theory this could be attached to an STM Nucleo development board for a working VESC-alike. Of course after they were manufactured I noticed I'd forgotten one thing, the phase voltage sense connections. *sigh*


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