• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 580 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

Lead Acid 12V 12 Ah battery charger, float charge.

Michele Canepa
Prodigy 40 points
Other Parts Discussed in Thread: TPS61175, TPS61170, BQ2031, BQ24450

Hello all,

I would like a suggestion about charging a lead acid 12V 12 Ah battery from a controlled Supercapacitor voltage source: the maximum input voltage ( that is the voltage across the series of 4 supercaps(2.1Volts max)  is 8.4 V .

I wondered if I could use a TI component to achieve the float charge of the battery.

The capacitors are assumed to discharge during the charging of the battery, the system has got a microcontroller inside of it that monitors the voltage across supercaps, and may monitor the voltage across the battery.

I thought about a controlled 5/15 DC/DC elevator, in order to get constant 15V to the output side (the DC DC may work from 8.4 Volts to 4.5 Volts), and then an integrated circuit to control the charge.

What solution do you suggest?

Does exists a single component that can do the charge from a variable dc source?

Thank you in advance,

best.

Michele

  • 0
    TI__Guru**** 150650 points

    You will need to first boost the super cap voltage to be above the maximum battery voltage that you want.  For this, the TPS61175 will work or the TPS61170 for lower charge currents.

    After you have boosted the voltage, the bq2031 or bq24450 should be used to charge the batteries.  The bq24450 will be a much simpler solution.