Interessato ad acquistare alcuni condensatori ibridi 283-HS1625-3R8227-R-ND per un progetto DIY. Quale sistema di ricarica e gestione è consigliato per i condensatori in oggetto?
Ringrazio in anticipo.
Hello aminguzzi, welcome to the DigiKey Techforum.
I do not see a Charging or Management System recommended for this capacitor.
Maybe one of the engineers can add their knowledge to this post.
Maybe in English it will attract more comments
Interested in purchasing some 283-HS1625-3R8227-R-ND hybrid capacitors for a DIY project. What charging and handling system is recommended for these capacitors?
Thank you in advance.
Hi aminguzzi,
From Eaton’s website here, they do not need a BMS (Battery Management System) like a standard lithium battery would require, but they do need a less complex CMS (Cell Management System) to prevent over discharge below 2.2V and to keep cell voltages equal when multiple cells are connected in series, just as one would do with standard supercapacitors.
So, they do not need to follow a carefully specified charging profile, but charging needs to be halted when they reach the maximum working voltage, discharge must be halted when they reach minimum working voltage, and series connected cells should maintain balanced voltage levels.
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Thank you David for clarifying the operational range of hybrid capacitors. Now, Is there ready made device that would manage the caps as you explained?
Thanks in advance
Maybe. It depends on precisely what you are trying to do, such as how many cells you plan to use, how much current you expect to be charging and discharging to/from the cells, the architecture of your system (power sources, load type, usage, etc.).
We have several development boards designed to work with supercapacitors, though most of them probably would not be suitable, at least without modification or adding external circuitry, based on the requirement that these cannot be discharged below 2.2V.
We have integrated circuits in several categories which may be suitable to build around as part of a solution, including Battery Chargers, Battery Management, and Power Management - Specialized. Depending on the nature of your application, there may or may not be a part that can do everything you need by itself.
One may need to use several different components to make a reliable system. Op-Amps can be used to maintain proper balance, as shown in this write-up. I would not recommend passive balancing, which utilizes resistors, as they will continuously draw current from each cell and this could cause them to be drawn below 2.2V if power were removed for a sufficient time.
For over-voltage and undervoltage protection, one would need some means of measuring voltages and controlling the charging and discharging current as appropriate. This could be via a microcontroller’s ADC, comparators, voltage detectors, or some combination of these and or other devices.
In summary, it is still pretty complex, and there is likely not a single part or device which can do the balancing, overvoltage, and undervoltage monitoring and control.