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BQ24650: Selection of AC to DC Adapter as input

Jeong Jake
Prodigy 60 points
Part Number: BQ24650


Hi TI,

I am working on a design with this part charging by PV Panels and AC to DC adapter. I’ve reviewed thread related to my issue and hope to get some advice.

PV panel is main input and AC to DC adapter is additional source of input if it’s possible to access to grid in the venue of installation sites. 4SNP LiFePO4 battery Pack (12.8V) is attached.

I wonder what is the proper voltage and ampere of AC to DC Adapter when voltage and ampere of PV panel is as follows.

-Vmp: 18.5V, Amp: ~8A(depends on Wattage of PV Panel), Voc: 21.9V

1. Is it suitable to use 24V, 8A AC to DC Adapter? 24V is more than Vmp of PV panel and less than 33V. If not, I hope to get your advice.

2. What about the Ampere of AC to DC Adapter I’m considering? Is the Ampere too high?

3. Is it necessary to use AC to DC Adapter providing CC and CV DC output?

 

Regards,

Jeong, Jake

  • 0
    TI__Mastermind 24075 points
    Hi Jake,
    Yes, you want to have a higher voltage adapter than Vmp so if you use MPPSET according to solar panel input, it will not interfere with charging when your input is adapter. The amperage rating is the max input current your adapter can supply so unless your input current in the application is higher than 8A this should not be a factor.

    3. I am not quite sure I understand this question. Can you elaborate?The CC CV charging profile depends on the voltage of the battery sensed at Vfb.
  • 0 in reply to Kedar Manishankar
    Prodigy 60 points
    Hi Kedar,

    Thanks for your advice.

    Regaading cc cv charging profile, I'll review by myself more deeply since the requirements of my application are a little bit tricky.
    Your advice is helpful to me.
    I'll post later if there's another issue to get help from TI.

    Regards,

    Jeong, Jake
  • 0 in reply to Jeong Jake
    TI__Mastermind 24075 points

    Hi Jake,

       Glad your initial questions were able to be resolved. I will close this thread and when any new questions come up, feel free to create a new thread.