APC Smart UPS 450 VA, for Server 19" Rack 1U, Teardown
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- Опубліковано 7 бер 2024
- A teardown of a 19" 1U server UPS, the APC SC450RMI1U UPS, a run down of the current paths in the system.
Rated for 450 VA or 280 Watt.
Data on the unit: www.apc.com/shop/hr/en/produc...
Discussion of the teardown: highvoltageforum.net/index.ph...
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#electronicscreators #UPS #teardown - Наука та технологія
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For many more UPS teardown articles and videos, I hope you will find these articles worth your time! kaizerpowerelectronics.dk/teardown/10-kva-eaton-ups-teardown-model-powerware-9355/ kaizerpowerelectronics.dk/teardown/belkin-regulator-pro-silver-650va-ups-teardown/ kaizerpowerelectronics.dk/electronics/teardown-of-a-5-kva-4-kw-eaton-ex5rt-ups-system/ kaizerpowerelectronics.dk/teardown/apc-rs-1000-ups-teardown/ kaizerpowerelectronics.dk/teardown/teardown-of-a-ge-lp-33-10kva-ups-system/ kaizerpowerelectronics.dk/teardown/eaton-powerware-20-kva-ups-teardown/ kaizerpowerelectronics.dk/teardown/teardown-of-a-eaton-powerware-60kva-ups-system/ kaizerpowerelectronics.dk/teardown/teardown-of-a-merlin-gerin-pulsar-esv-22-ups/ and kaizerpowerelectronics.dk/teardown/teardown-video-of-eaton-powerware-30-kva-ups/
The smaller UPS are made in a way, that when you discharge the battery in 10 mins, the accumulated heat could be taken by the sole mass. After the batteries run out, the device is warmed up, but will no longer get warmer, as there is no more power. So no forced cooling required. Forced cooling as fans are usually present either on high power rated units, or those, which can attach external battery packs.
Yes, I was not fair in comparing it to a double conversion UPS :)
UPS teardown is one of my favorite content .
Absolutely and not many of them are on UA-cam
I got some more different APC UPS models in my workshop, waiting to become the next teardown and video :)
With that username of yours, I can see why you find this video to be a favorite :) Check out the pinned comment for much more of my UPS content.
Yes just a 5 to 15 minute backup, there for the small server it is attached to to safely power itself down. Will bet that the transformer is wound with aluminium wire though, and that the transformer is very light. the small heatsinks are there to handle the dissipation for 15 minutes of operation when mains is lost, and in normal use those mosfets also do double duty as the bridge rectifier diodes that use the transformer, fed from the incoming mains, as a charger for the battery, to get fast charging. No gate drive, purely the body diodes used. The windings and tap switches are also used to give 2 levels of relatively constant voltage on the output, as the microcontroller does tap changing to keep the battery voltage reasonably constant, though of course it will long term cook the batteries, as it continually charges them to past float voltage, typically running around 14V per 12V nominal 7Ah SLA pack.
Fair point, it is not okay for me to compare it with a double conversion UPS :)
Using it for my 9U network rack. Pb batterirs are holding my low load (60w approx.) for an hour. Planing to repack it with LiFePo4 batteries 4S2P with balance board. Hope to double the working time from battery.
Hello Mads! In your review of the uninterruptible power supply board, you said that the power stage using transistors is built using the “H-Bridge” topology. But this is not at all true; the output stage is built according to the “push-pull” topology.
I will stand corrected if that is the case, but since the datasheet describe it as running a stepped approximation drive of a sine-wave, I assumed a full-bridge, without inspecting the PCB tracks :o
@@KaizerPowerElectronicsDk There is no sinusoidal voltage there, not even close. The voltage at the output of this converter has the shape of a trapezoid. If you look closely at the heatsinks on the board, you can see that only two of the four transistors are mounted.
@@KaizerPowerElectronicsDk Also, due to the fact that the transistors switch at a low frequency (50Hz), the dynamic losses in them are negligible, which is why the radiators have such modest sizes. If this inverter operated at least at 20 kHz and 50 Hz modulation, then the output voltage would have a sinusoidal shape. In this case, the transistors generated a lot of heat, which required fairly large radiators to dissipate.
Thank you for the clarification :)
Nice teardown, I guess you could keep the transformer for something.
I am in a brutal work shop cleaning phase! If I have no designated project in mind or it is not a expensive part, out it goes :)
@@KaizerPowerElectronicsDk I understand :)
Oh so that's what those transformers are from. I bought a transformer off ebay for $30 hoping to turn it into a high voltage high frequency ish transformer (around 400hz or so).
What batteries does it take? Those oddball, expensive cylinder lead acids? One of the 1U units I installed at work a year or two back used a pretty sizable lithium pack, but it's also a relatively "new" design, the pack was manufactured in 2018. (Reused from another setup, hence it being old.)
As many of their other designs, its two regular 12V batteries built into a simple 24V package of expensiveness. www.apc.com/shop/hr/en/products/APC-Replacement-Battery-Cartridge-18-with-2-Year-Warranty/P-RBC18
Could you please clarify, is this a pure sine or stepped signed ups ? It Says : 450VA/280W line-interactive pure sine wave 1U rackmount UPS battery backup
But also : Wave type Stepped approximation to a sinewave
I guess the vague and complex answer is, it depends on the load. But from a technical point of view, its stepped approximation.
That's why I stopped installing "IT grade" electrical equipment - IT people consider 20 years, "a good lifetime", while even residential grade electrical reticulation is good for 60.
APC 😢
Owned by Schneider Electric since 2007 :)