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RespiraWorks / Ventilator

Fully-featured ICU ventilator design, optimized for manufacture using commonly available components and free to license. Repository tracks all mechanical, electrical and systems design, software, requirements and regulatory documentation.
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Selection of power supply / voltage adapter #966

Open martukas opened 3 years ago

martukas commented 3 years ago

What has to be done Must decide on power supply / voltage adapter for ventilator:

How do you know it has to be done The thing needs power to work :)

Code pointers Currently the part is linked in manufacturing/peripherals.md. The newly selected part should either go in that page or whatever replaces it under docs with RST.

martukas commented 3 years ago

decision on power supply might actually be helpful in ordering 20 units for the next iteration builds?

martukas commented 3 years ago

We have this alternate listed in our brain build BOM: https://www.mcmaster.com/3791N024/

which appears to be medical grade.

@inceptionev

inceptionev commented 3 years ago

@martukas I looked at other options and it looks like a lot of medical power supplies use this connector in higher currents. I think we should probably consider switching over to this connector at least until we know our power envelope better.

As an alternative, the MeanWell medical GSM160A12-R7B is a similar part, provides 11.5A, and is $64 in small quantities. Supplier link: https://www.digikey.com/en/products/detail/mean-well-usa-inc/GSM160A12-R7B/7703457

inceptionev commented 3 years ago

For the input connector we can use this: https://www.digikey.com/en/products/detail/kycon-inc/KPJX-PM-4S/9990081

martukas commented 3 years ago

@inceptionev has identified one that might fit behind the acrylic: https://www.digikey.com/en/products/detail/cui-devices/MD-40SP/166042

EDIT: THIS DOES NOT FIT See other comments below.

dcstraney commented 3 years ago

For future reference, that last one (the CUI MD-40SP) is unfortunately too small (mini-DIN rather than "power DIN"/Kycon's not-actually-DIN size). It looks like the KPJX-PM-4S or KPJX-PM-4S-S (same with metal flange) are the only panel-mount options. There is a vertical through-hole one that protrudes more, but would have to mount to a small board that mounts to the housing at a few places, and seems like a broken solder joint waiting to happen after however many hundreds of insertions and removals: https://www.digikey.com/en/products/detail/cui-devices/PD-40VS/2712204

dcstraney commented 3 years ago

For the 14V-20V (no battery charging) or 17-20V (with battery charging) we'll need, AC adapter options available from Digikey are: 18V, $68: https://www.digikey.com/en/products/detail/globtek-inc/TR9CH9440YL4IMR6B/9837832 (don't know Glob-Tek or how trustworthy they are) 15V, $68: https://www.digikey.com/en/products/detail/xp-power/VES150PS15/7897385

inceptionev commented 3 years ago

The DC input is current-limited, so we want to go to 19V or 20V to get the most power.

We haven't tested any power supply yet for v0.3, but I recommend going with this one, which is in stock here: https://www.bravoelectro.com/gsm160a20-r7b.html (Mouser looks to have a couple in stock too)

The Glob-tek one could also work, but note that it has a different power connector pinout from the Mean-Well.

The only connector that we've tested to work so far is: https://www.digikey.com/en/products/detail/kycon-inc/KPJX-PM-4S/9990081

martukas commented 2 years ago

Need to go with this for 24v as required by new PCB https://www.digikey.com/en/products/detail/mean-well-usa-inc/GSM220A24-R7B/7703494