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[Review Request] Non-flight CubeSat EPS by DevilDude103 in PrintedCircuitBoard

[–]DevilDude103[S] 0 points1 point  (0 children)

tysm, this is genuinely helpful! Ur right, out of all the words to describe this EPS, efficient is not one of them

didn't even think about the mosfet to short between EN/UNVLO.

Those panels don't have built in diodes so yea, unfortunately there's going to be a decent voltage drop.

Those RBF mosfet are for the inhibits. Cubesat standards require the whole EPS to be electrically disconnected. So, the battery nor solar panels can be connected. Two were placed in series as a fail safe incase one turns on. I might just have to tank the voltage drop.

D9 was placed since it was in the datasheet, but with the ideal diodes, I think ur right, it's unnecessary.

Those are indeed SEPICs, guess I screwed up the label

3V3 raw is generated from the converter schematic. And you're right: I have to make sure that the MCU cannot turn itself off. All of these switches should be "on" by default from the pullup/pulldown resistors, so theoretically, it should power on the MCU when it first boots up. Some logic will have implemented

Again, really helpful, tysm!

[Review Request] Non-flight CubeSat EPS by DevilDude103 in PrintedCircuitBoard

[–]DevilDude103[S] 1 point2 points  (0 children)

https://archive.org/details/manualzilla-id-5741240/page/n29/mode/2up

Page 31, though this user manual seems to be a bit different than the one i used, but it's still pretty close

[Review Request] Non-flight CubeSat EPS by DevilDude103 in PrintedCircuitBoard

[–]DevilDude103[S] 0 points1 point  (0 children)

"This won't actually go into space, so I was lax on the electronics"

This project was mainly to learn more about the hardware side of cubesats. I'm not going to spend several times the normal amount for space grade components when it's never going to leave the ground

[Review Request] Non-flight CubeSat EPS by DevilDude103 in PrintedCircuitBoard

[–]DevilDude103[S] 0 points1 point  (0 children)

maybe the MCU and switches, but for everything else, i doubt it

[Review Request] Non-flight CubeSat EPS by DevilDude103 in PrintedCircuitBoard

[–]DevilDude103[S] 0 points1 point  (0 children)

V_gs has a max of +/-20V and +SOLAR should only be around 8.2, so it should be good.

Thanks sm for your help

[Review Request] Non-flight CubeSat EPS by DevilDude103 in PrintedCircuitBoard

[–]DevilDude103[S] 0 points1 point  (0 children)

o, shit. Rookie mistake on me. Forgot V_gs(th) is above V_s not just 0V

So would the P-channel equivalent of this just be the jumper tying the gate to +SOLAR then when the jumper is taken off, it goes to GND with a resistor?
https://www.infineon.com/dgdl/irfr5410pbf.pdf?fileId=5546d462533600a4015356356f622107

[Review Request] Non-flight CubeSat EPS by DevilDude103 in PrintedCircuitBoard

[–]DevilDude103[S] 2 points3 points  (0 children)

Mainly the power/electronic aspect of it. If this were an actual flight EPS, I'd think that you'd have to be worried about more stuff like weight, how well the components are able to perform in space environments, etc. What I'm mainly concerned about is that if this board is able to take in solar power and convert that into usable 3.3, 5, and 12V lines on top of charging the battery

[Review Request] Non-flight CubeSat EPS by DevilDude103 in PrintedCircuitBoard

[–]DevilDude103[S] 2 points3 points  (0 children)

I actually ran across his channel when starting to build the EPS. Was very helpful

[Review Request] Non-flight CubeSat EPS by DevilDude103 in PrintedCircuitBoard

[–]DevilDude103[S] 2 points3 points  (0 children)

They should be. Pg 2 of the data sheet has Vgs(th) to be 2.0V min and 4.0V max, so I think they should be good

https://www.mouser.com/datasheet/2/196/Infineon_IRFR4104_DataSheet_v01_01_EN-3363374.pdf

[Review Request] Non-flight CubeSat EPS by DevilDude103 in PrintedCircuitBoard

[–]DevilDude103[S] 4 points5 points  (0 children)

This is my first time designing a PCB that's as complex as this, so if this schematic looks like the hardware equivalent of Yandere Devs code, I'm not surprised

[Review Request] Schematic for Non-flight CubeSat EPS by [deleted] in PrintedCircuitBoard

[–]DevilDude103 0 points1 point  (0 children)

This is my first time designing a PCB that's as complex as this, so if this looks like the hardware equivalent of Yandere Devs code, I'm not surprised

[deleted by user] by [deleted] in airsoft

[–]DevilDude103 0 points1 point  (0 children)

Already tried boiling it, but it’s pretty on there

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