Electronics > Power/Renewable Energy/EV's

What is the highest current SMPS in the world?

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Gyro:
You're losing track of which implausible thread you're posting in... https://www.eevblog.com/forum/renewable-energy/pwming-thousands-of-amps/msg5357345/#msg5357345

T3sl4co1l:

--- Quote from: langwadt on February 26, 2024, 02:52:49 pm ---AC/DC tig welder?

--- End quote ---

Even spot and stud welders don't go that high ("only" 1-2kA I think).  Specialty spot/diffusion bonding welding equipment might sometimes push 10kA, I don't know?

There aren't many applications that require such currents, and even fewer that need it so tightly controlled, or efficient, as an SMPS provides.  Aluminum smelters for example use currents greater than this (10s kA), but it's steady DC supplied from a multiphase rectifier or the like.  Welders can also use AC, as can resistive heaters.  A typical steelmaking electric arc furnace might run at 400V 40kA (three phase).

~GW grid interconnects are in the couple kA range, stacked for up to a MV or so; it's neither efficient nor cost-effective to run higher currents.

You can push current as high as you like, paralleling modules, or using transistors in parallel plus enough switching time to ensure full commutation and current sharing, but multiphase is the way to go for compactness, efficiency and scalability.

Tim

langwadt:

--- Quote from: T3sl4co1l on February 26, 2024, 06:17:17 pm ---
--- Quote from: langwadt on February 26, 2024, 02:52:49 pm ---AC/DC tig welder?

--- End quote ---

Even spot and stud welders don't go that high ("only" 1-2kA I think).  Specialty spot/diffusion bonding welding equipment might sometimes push 10kA, I don't know?


--- End quote ---

it was more in response to the "examples where the transistors switch the high current", an AC tig output is fifty to maybe a few hundred Hz
I'm guessing (maybe wrongly) that they do that by swapping polarity after the main high current supply

T3sl4co1l:
Not sure about commercial designs, haven't looked at any manuals (if they publish service manuals at all..), but that's a common way to do it as an add-on, yeah. :-+

And, for my part, just adding on what high-current applications I can think of at all.

Tim

IanB:
I've always thought that trains would be fun things to work on. Crossing the boundaries between electrical and electronic engineering. You have signalling, train systems (HVAC, lighting, doors and other automation), multi-MW power converters, traction motors, driver controls and automation, and no doubt other things I can't think of.

Added to that, trains like the one below make all sorts of interesting noises. I especially like the 50 Hz transformer hum when it switches over to the 25 kV OHLE supply.


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