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Supercapacitor fallback from Li-ion charging IC

Discussion in 'Physics' started by pythomatic, Oct 8, 2018.

  1. pythomatic

    pythomatic Guest

    I'm currently charging a single Li-ion cell from a dedicated charger IC. Due to the intermittent nature of the charging source and Li-ion not being able to charge below 5 deg C it is possible that the battery may run below it's ideal level. I am adding a supercapacitor so that the circuit can operate in low power mode if the battery is in deep discharge.

    I'm struggling to work out a simple circuit that could charge the supercapacitor from the same charger IC, whilst trickle charging the battery, provided it's above 5 degrees C. I have a dedicated microcontroller for the charging circuitry, so I can digitally measure and control various parts. I also have a 3.3V reference source that can be used.

    [​IMG]

    I'd prefer not to introduce a completely seperate switching converter to charge the supercap however I'm aware that this could be a solution.

    Interested to hear any suggestions on how best to tackle this problem!

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