Electronics > Projects, Designs, and Technical Stuff
looking for an 8S LiIon charger IC
TmaxElectronics:
Hello,
I have a new battery powered studio light project, which at the moment uses a 4S LiIon battery pack with integrated USB C charging. However i now have plans for a version with more capacity and a more efficient boost circuit (instead of going from 15V to 50V i would go from 30V to 50V) for which i would need an 8S battery pack.
I have already looked around for a suitable boost charger but was not able to find one :-// . I did think about using the same IC as the LED driver, as it has an accurate voltage limit feature, but it does not have input current limit.
Is there even an integrated solution for such a special case, or will i have to improvise something or potentially even ditch the integrated charger all together?
jonpaul:
Hello, no idea what you mean by 4S or 8S.
Please be more specific the type, and capacity battery.
Many dedicated IC s exist for battery charging.
Do not use an LED drive, completely different.
You do not mention the power source, 240v mains?
Finally beware that lithium batteries are potentially dangerous and catch fire or even explode if improperly charged.
There is a safety, compliance and liability issue in such a project especially if intended for volume manufacture.
As the cinéma and still film portable lighting market is well developed, you should survive the available lights and battery packs and chargers already existing.
Just the rambling of an old retired EE!
Bon Chance
Jon
martin1454:
--- Quote from: jonpaul on September 11, 2019, 12:47:38 pm ---Hello, no idea what you mean by 4S or 8S.
--- End quote ---
4S or 8S is 4/8 battery cells in series,
so 4*3.7V and 8*3.7V
todd_fuller:
Not many out there that handle 8S standalone. LTC4162 is one.
TmaxElectronics:
But the LTC4162 is only step down right?
The usb would be able to supply a maximum of 20V, so i would need a boosting charger.
I did however find the LT3796, a boost controller IC with CC and CV output modes and input current limit. It is however not intended for charging LiIon cells. Would it be possible to modify it to do that? I would expect the charge termination to be the most difficult thing.
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