Dave explains the three main methods of Uninterruptible Power Supply design - Offline, Online, and Line Interactive. And then opens an APC 2200XL rack mount UPS to see how well it matches the classic block diagram theory. Will there be any surprises?
Schematic: http://eevblog.com/files/apc_smart-ups_su2200_3000.pdf
Patent: Method and apparatus for providing battery charging in a backup power system
http://www.google.com/patents/US5302858
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Schematic: http://eevblog.com/files/apc_smart-ups_su2200_3000.pdf
Patent: Method and apparatus for providing battery charging in a backup power system
http://www.google.com/patents/US5302858
EEVblog Main Web Site:
http://www.eevblog.com
EEVblog Amazon Store:
http://astore.amazon.com/eevblogstore-20
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http://www.eevblog.com/donations/
Projects:
http://www.eevblog.com/projects/
Electronics Info Wiki:
http://www.eevblog.com/wiki/
Done.
you sound like tom holland
I love to learn electronics
thank you!!!!! i want to give you a hug!
you exactly solved my Problem!
This information was trans-formative. Just saying.
Can you slowly explain? You talking like woman…
Hi mate. What's your view on the reliability of Neutral on the output of a UPS? There is a notion in my team that when a single-phase installation takes place, it should be protected with a 2-pole circuit breaker because UPS Neutral may be somewhat dangerous, unlike in typical installations when Neutral is hard-wired to the N bar or similar. Is this because we regard a UPS as a black box with a possible flaw?
I dont understand why an online double conversion has a switch
How would you disable charging of the battery only?(in case of multiple ups on same battery). Without using diodes in series with the battery.
Due to creep creeping around my house with armed robbery on the creature's mind I installed a photobeams alarm system, and a 8 cameras security system monitor outside my house. I bought a "APC UPS Battery Backup and Surge Protector, 600VA Backup Battery Power Supply, BE600M1 Back-UPS with USB Charger Port" to power my PC and security equipment. I have a 12V deep cycle marine battery in my basement with a surge protected 4 amp float charger. I supply 12V DC power to my modem, router, and photo beam alarm system straight from the marine battery at all times. The UPS supplies power to my PC and security camera system. I removed the UPS battery that could only supply backup 12V DC for 16 minutes. and connected the marine battery to the UPS battery connection wires. The marine battery can supply the entire 140 watts my setup draws for 82 hours. . I don't know which of the three categories my APC UPS BE600M1 is in, but I did a test by unplugging the 120V UPS supply from the utility and nothing shutdown. Nothing at all happened. Not even a blink.
H Bridge serves as the rectifier aswell in the reverse charging mode
It seems to me that the charging of the battery is continues as long as the battery is connected. Then you will have an uninterrupted power supply limitless. Free energy.
How do I remove the ups from by pass mde
All very interesting as normal and I'm not that technical but my question is what's a "brick dunni" as Dave mentions. 🤣 We don't seem to many of those in the UK!
I would love your help. My power goes out a lot where I live, so
I have a couple older smaller APC UPS ,[600w and a 400w] that I have had some lights and laptop hooked up to with larger deep cells and they would run a really really long time, dependent on actual battery life.
I bought a APC Back-UPS Pro 1000 S BR1000MS [pure sine wave] to replace a non pure sine wave UPS and put my 100 amp hour battery on it, to run my flat screen TV and some light off grid . But, while the load is well under the max load of this inverter, this UPS unit, thinks it has the same stock 7.5 amp hours batteries that they come with it and only runs for 24 minutes and it thinks it needs to charge the fully charged 100AH battery for 16 hours.
Not expecting this to not work this way I put time into this thing taking out the plastic around the transformer out to put on metal grills and fans because I know it would be getting hot .
This has a cable to my computer for some other options , but nothing to disable this battery timer thing that is posing as a monitor.
It would be great if you investigated this and found software to disable the battery timer shut off.
It does have several relays on the board and i hear it switch off. If I knew which one, I could bypass it with a switch.
Looks like APC were ignoring patents and getting shafted in court almost weekly for multiple millions $ by every Tom Dick and Harry… And losing each time.
Edit Best Power had multiple cases against APC and won hundreds of millions…Blimey! OK it is clever but that is a high price.
On your drawing you made you say diodes but you draw "zinner" diodes. am I correct
I have used many, many huge (100kva and up) for data centers. The "U" in UPS means UNINTERRUPTABLE. This means ZERO power transfer time delay and NO PHASE shift. The output power is completely obtained by the inverter. This is what a true UPS does anything else is a STANDBY lower supply.
I had one in a large data center that supplied global credit card processing systems (all mainframe stuff) the UPS room was 625 sq feet. I contained racks of batteries and a unit on the wall that just buzzed. It supplied 3 phase power to the data center. With all thay power we only had 45 min if battery power. We didnt need much because we had a generator that would activate if we lost power so at most the batteries were needed for 2 or 3 min until generator stabilized
It seems strange that there are some large electrolytic capacitors sandwiched between the MOSFET heatsinks. Isn't that likely to warm up the capacitors and shorten their life?
Thank you for this video. I subscribed and I stand to learn a LOT from you.
Using the by pass diodes as bridge retifier is nice!
Can use and charge a lead acid at the same time. EV