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Qi solution for 2s li-ion battery (wireless 2-cell battery charger) ?

bumkyu koh
Prodigy 110 points
Other Parts Discussed in Thread: BQ2057, BQ2057T, BQ51221, BQ51010B

Hi, guys.

I'm searching a solution for wireless 2p2s (2 series) Li-ion battery charger.

I found Ti has well-organized solutions for wireless power transfer system. (http://www.ti.com/lsds/ti/power-management/wireless-power-receiver-solutions-overview.page)

However, I think all of these solutions are for 1 cell battery because output voltages are 4.2 V. I'm developing a device that uses 2p2s Li-ion battery, so I need wireless 2s battery charger solution.

To do that, I'm searching for a way to use an additional charger for 2s battery like bq2057 (http://www.ti.com/lit/ds/symlink/bq2057t.pdf), but Ti's Qi solutions' output voltage is limited to use it.

If anybody has a idea to charge 2s li-ion battery easily, please let me know.

Thank you very much.

  • 0
    TI__Genius 14890 points

    My apologies for the delayed response.  

    TI offers a few solutions that are able to do more than 4.2V / 4.35V.  The bq51010B is a wireless power supply that produces a 7V constant output.  The newly released bq51221 is a wireless power supply that has an adjustable output of 4.5V to 8.0V.  Perhaps one of these could be investigated for your solution.

    What is the power level of your requirement?

    Regards,

    Dick