• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 275 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.

BQ24650: Parallel connection of several boards to power source

Tomer Bruchiel
Intellectual 640 points
Part Number: BQ24650

Hi,

We had a situation that one of our customers connected 3 boards to  a single solar panel and another case that it connected 3 boards to a power supply.

I recommended against it but will it work or each board will try to take control of the source?

Another issue was, will it be possible to connect 3 220V to 24V transformers to 3 boards (one per each) but all the transformers will be connected to the same 220V source.
What will happen? will the MPPT tries to reduce the 24V to the MPP voltage and as a result will change the 220V stage? How will all three work together if at all?

Thanks,

Tomer

  • 0
    TI__Guru**** 166176 points

    Hi Tomer,

    The MPP circuit attempts to regulate the charger's input voltage by reducing the current that the charger pulls from the power source.  It indirectly regulates the charger's input voltage.  Connecting multiple voltage regulating circuits to the same node is generally not recommended.  They each have their own reference and tolerance so they regulate to slightly different voltages.  This may lead to them fighting each other and cause an oscillation. 

    The MPP circuit only turns on if the charger is pulling more current than its power source can provide. A solar panel has a high output impedance and so it is likely that the MPP circuit will turn on at some point.  If the 24V transformers can provide all 3 chargers' desired input current and not droop to the MPP point, the MPP circuit will not turn on.

    Regards,
    Jeff