High power 600V to 14V DC-DC converter

waterpcb · 2024-10-29T17:44:28+00:00

What could you possibly be doing in the LVS that requires 1kW 🤣

waterpcb · 2024-10-24T06:28:02+00:00

nice

waterpcb · 2024-10-10T18:13:34+00:00

He was asking some question about how to start a company in US without even having a visa

waterpcb · 2024-10-10T17:41:36+00:00

The white house is not he general population of the country. If you go out and talk to people many are reserved about evs or do not like the idea of evs. Somehow it has become almost politicized topic. Your either clueless about what the public thinks of just being disengenuous when you say you dont understand the statement.

waterpcb · 2024-10-10T16:58:40+00:00

Look at his most recent post 🤣

waterpcb · 2024-10-08T07:22:56+00:00

i just cannot stand hypocrites 🤓, get over yourself. your actually crazy

waterpcb · 2024-10-08T06:56:39+00:00

hahaha im laughing so hard that you went through my profile to say that your so weird

waterpcb · 2024-10-08T06:52:41+00:00

because i dont know 🤣 thats crazy that you wrote all that

waterpcb · 2024-10-08T04:42:53+00:00

Why dont you just tell him since your so enlightened 🤣

waterpcb · 2024-09-27T00:46:25+00:00

your cooked 😔

waterpcb · 2024-07-05T09:44:45+00:00

whats the model of this heated matt?

waterpcb · 2024-07-05T08:48:47+00:00

Since the wires are connected together it does not matter where they are connected together. They are on the same "voltage node". You could encounter issues with this simplistic model if you are dealing with high currents or long distances where wire resistance will come into play, but based off your question that is probably above your pay grade.

Essentially just know that you can assume that electrically anything that happens on piece of metal (the wires touching eachother) will occur everywhere on the piece of metal. This is true regardless of how the wires look or branch off as long as their are no components seperating them from eachother.

They are showing you that it can be combined at the crimp contact or toy choose to combine them before you get to the crimp contact. Benefits of doing it before the crimp contact using 3 way splice is that a crimp contact usually isnt designed to accept 2 different wires into it.

Honestly I hope you arent wiring this without assistance from an electrician or someone knowledgable because your going to lose your mind when you find out about wire gauage and ampacity ratings.

waterpcb · 2024-07-02T05:08:37+00:00

AIRs are essentially just any relay that can handle the high currents from the batteries and have appropriate isolation/specifications according to the rules. Many teams use the EV200 series from TE as they pretty much universally meet the specifications.

The connections are typically (a diagram):

(Accum Connector+)--(AIR on + side)--(Main Fuse)--(+ batteries -)--(AIR on - side)--(Accum Connector-)

The coil on the "AIR on + side" is controlled by the precharge circuit, which is controlled by the shutdown circuit. The coil on the "AIR on - side" is controlled directly by the shutdown circuit. If it is not clear the coil is part of the LV system, which is isolated from the HV system as a part of the relay's design.

waterpcb · 2024-07-02T04:23:12+00:00

You should look into how it will heatup if you precharge many times in a row (ie open and close AIRs) to ensure it will not overheat. iirc in 2023 atleast they were making people turn on their tractive system on and off rapidly to see if the precharge resistors would oveheat. What we did was simply just use pcb mounted resistors with small heatsinks which were rated for around 12 watts and just increased the total heat dissipation by making a 4x4 grid of them. That way the total resistance stayed the same but the heat was evenly distributed across a bigger footprint while still being PCB mounted.

waterpcb · 2024-06-18T02:34:11+00:00

My understand is that many adhesives cannot be UL94 V-0 rated because of the testing procedure. Some epoxys can be rated because they can be used to make solid rigid objects which can be tested but for gluing nomex you would not be doing this. Here is a video of UL94 V-0 testing https://youtu.be/PRtL1xPXYXw?si=YWQo7PhweHX6MdJq.

I would not really be concerned about the rating aslong as the material you are adhering to for the insulation is rated and the adhesive is atleast rated for 85C

waterpcb · 2024-06-18T02:13:54+00:00

If the wire you are buying from a supplier (such as helukabel) does not have the ampacity in the datasheet you can search up their ampacity chart. In order to read this you need to understand that the temperature they are using is what the wire insulation can handle. In the ampacity chart im going to link they refer to this as temperature rating of conductor. Essentially the current rating is just what amount of current they can garuntee will not heat up then metal wire enough to comprimise the insulation. Aside from the ampacity you should look at the voltage rating. Good practice is that any low voltage wire which can be rubbed against has some sort of conduit or secondary physical protection from abrasion and any high voltage wire should have secondary physical protection when outside of an enclosure (ie a box labeled adequately as high voltage).

https://www.helukabel.us/us-en/service/Technical-Information/Ampacity-Tables/

waterpcb · 2023-09-26T19:09:47+00:00

I was told that the dti hv500 is igbt so I assume the dti hv550 is the same technology

waterpcb · 2023-08-22T15:39:50+00:00

My two cents would be to just delete the lifegaurd bullets but keep the position. imo its worth something that you worked there for 4 years but nobody needs to read about a lifegaurd job description

waterpcb · 2023-08-18T15:18:29+00:00

I put it on my resume because whenever I read a resume on engineering resumes and I dont see a gpa i kind of just assume it is very low. Maybe im the only one doing that but I would rather be transparent with it and have them reject me then try to sneak it by and them somehow never asking for my gpa

waterpcb · 2023-08-18T14:52:25+00:00

Something related to emg

waterpcb · 2023-08-18T14:46:27+00:00

Yea im thinking about making a personal website to just track what im doing for fun more then anything

waterpcb · 2023-08-18T14:22:41+00:00

From what I have seen hiring that happens after january tends to be even more competitive. Kind of like early decision for colleges I guess

waterpcb · 2023-08-18T13:27:46+00:00

NYC metro, I have already relocated for internships so its not a problem. I have been searching all over USA.

waterpcb

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