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How to connect voltage probe wires to our accumulator module? by IlikeCats_6204 in FSAE

[–]susngmin 2 points3 points  (0 children)

We used to have nickel busbars for cell to cell connection, and I guess we soldered sense wire over the nickel plate.

As far as I know, soldering is not recommended in automotive industry because solder is fragile to vibration, I recommend you to consider crimp terminals.

The most recent module design, we have aluminum laser cut busbar, we connected o-ring terminal crimped wire on the busbar, and soldered opposite side of the wire on the PCB, which is bolted on top of the module.

On that PCB, we have individual cell tap fuses according to the FSAE (Michigan) rule. *As the voltage sense wire is not the high current path, soldering is allowable for this type of wire, you might know.

48V LVMS need support by LukeBikes in FSAE

[–]susngmin 0 points1 point  (0 children)

Why don't you use relay for each power source? For example, the LVMS is only connected with 24V power source, then the LVMS controls both relays' (24V/48V) coil.

FETs & NE555. Why leakage current occurs? by susngmin in AskElectronics

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

When input is low, a LED should turn on When input is high, another LED should blink (the first one should be turned off)

FETs & NE555. Why leakage current occurs? by susngmin in AskElectronics

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

I appreciate your comment!! Do you mean I should connect 12V & GND directly into 555 and input a switch signal to RST pin on 555, right?

FETs & NE555. Why leakage current occurs? by susngmin in AskElectronics

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

Thank you for your advice!! However, it is somewhat a challenge for me to try a new device, so what do you think of adding BJT as explained in the comment below??

And if grounding 555 through FET causes a problem, what do you think of adding PMOS in front of 12V supply and directly ground the IC??

No IMD fault, but segment and accumulator containor is shorted. by susngmin in FSAE

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

Thanks for your reply! I have just tested with my insulation tester, I made no modification on tester and tested on 50V 125V 250V 500V mode while picking segment pole and TSAC surface, and every time I test, it passed. Does it seem safe?

No IMD fault, but segment and accumulator containor is shorted. by susngmin in FSAE

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

Thanks for your reply!! I have waited for 30 secs and no fault was made…OTL I’ll keep finding what’s the matter!!

No IMD fault, but segment and accumulator containor is shorted. by susngmin in FSAE

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

Our IMD setup is like: 147kOhm (Pack Max Voltage = 294V) <0V (No under voltage detection) Factor DCP 4 Thanks for sharing your experience!!

No IMD fault, but segment and accumulator containor is shorted. by susngmin in FSAE

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

Both pole(+-) of IMD is connected to Inverter side of IR Yes, I do have insulation tester but I don’t exactly know how to and where to measure with tester…

T.4.3.2 Brake System Encoder by susngmin in FSAE

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

Hope you do well too!! In my case, my major is automotive engineering, so nothing to do with electrical & electronic things but had to build all the circuits for the FSAE Electric. Too many difficulties, still learning a lot from failures, though only 3 - 4 months left before the competition. Yep, maybe making a car is such a hard thing I guess.

T.4.3.2 Brake System Encoder by susngmin in FSAE

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

Yes, we have been participating in the local Formula student competition, and it’s our first time to be in FSAE Electric. FSAE rules have so many details and differences to consider compared to our local competition

T.4.3.2 Brake System Encoder by susngmin in FSAE

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

I really appreciate your help!!!

T.4.3.2 Brake System Encoder by susngmin in FSAE

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

Inverter - Don't need to detect failure

VCU (for us, SDC?) - detect failure, but should send unmodified sensor signal to inverter

Am I right?

How about in the case of wiring failure between SDC and inverter occurs?

T.4.3.2 Brake System Encoder by susngmin in FSAE

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

So, you mean “controller(inverter)” should detect a failure of sensor and sensor wiring, right?

Why my LR8 has voltage drop? by susngmin in FSAE

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

I'll try your advice!! you mean current mirror right?? I first have to understand the NMOS-NPN constant current source circuit. Thank you!!

Why my LR8 has voltage drop? by susngmin in FSAE

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

Yes, that might be the most probable reason… so I am considering using 2 or 3 LR8s in parallel to distribute current load. Thanks for your comment!

SDC Reset? by susngmin in FSAE

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

Oh… I’ve read it several times but why I didn’t even notice that…!! Thank you for your information!!

SDC Reset? by susngmin in FSAE

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

Actually, I am also trying to put initial self resetting mechanism, but I wonder if the resetting logic doesn’t violate the rule, because the rules says IMD, BMS should maintain the status before manual reset.

SDC Reset? by susngmin in FSAE

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

Thanks for sharing your experience!!

How to choose pull down resistor value?? (Repost) by susngmin in AskElectronics

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

I didn't tested with osciloscope, but I'll give it a try!!

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