• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Subscribers 64 subscribers
  • Views 96 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS61099: TPS61099 for power harvesting

Kaveh Mohammad
Intellectual 585 points
Part Number: TPS61099

Tool/software:

Hi,

Can I use TPS61099 for power harvesting energy from a solar cell and storing its energy in a battery. 

I want to regulate the TPS61099 output voltage at VBAT=4.2V.

Please let me know, 

Thanks.

  • +1
    TI__Genius 10165 points

    Hi Kaveh,

    May I know the solar cell voltage range and the charging current you want to get? So that we can check if TPS61099 can support the charging current you need.

    Do you need MPPT function? Because the input power source is a solar cell, please note that the TPS61099 doesn't have any MPPT function.

    Thanks.

    Regards,

    Nathan  

  • 0 in reply to Nathan Ding
    Intellectual 585 points

    VBAT = 4.2V

    V_Solar MPPT = 2.5V

    Battery Charge Current Max  = 20mA

  • +1 in reply to Kaveh Mohammad
    TI__Genius 10165 points

    Hi Kaveh,

    Please note that TPS61099 doesn't have MPPT function, it means that the solar panel doesn't always operating on the max power point, 2.5V. 

    But anyway, if you don't care about the MPPT results, you could try with TPS61099.

    However, the TPS61099 can't limit the max output current to 20mA, the charging current depends on the power from the solar panel.

    Regards,

    Nathan

  • 0 in reply to Nathan Ding
    Intellectual 585 points

    Thanks Nathan. 

    I have used a supercap instead of a battery and ran a simulation. There seems to be current pulses charging the cap that can peak over 100mA (battery max continuous charging current is 20mA).

    I guess these should be ok, because those are just current peaks, and the average charging current is less than 20mA. Can you please advise.

  • +1 in reply to Kaveh Mohammad
    TI__Genius 10165 points

    Hi Kaveh,

    Looks like ok, due to the duration of each pulse current is very small, it is about several us from the figure, and the average current you said is less than 20mA.

    But I think you could also double check if the charging profile is ok with your battery vendor.

    Regards,

    Nathan