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WEBENCH® Tools: Overcurrent protector for quadrotor power

glenliu
Prodigy 40 points

Tool/software: WEBENCH® Design Tools

Hi 

I'm a research student from HKUST. 

I'm designing a power board for my quadrotor. And I need to add an overcurrent protector to my main power. The main specification is listed as below,

  1. motor driver board(15V) * 4
  2. flight controller(15V) * 1
  3. onboard computer(15V) * 1
  4. The total current could be 120A maximum
  5. Power source: 4S Lion Battery, 14.5V-16.8V
  6. power board size: 100mm*100mm.

Due to short circuit cases in the real fly, I need to add a short circuit/ overcurrent protector to the main power of my PCB board.

Appreciate any advice or suggested solutions.

Regards

Chuhao

power_board.pdf

  • 0
    TI__Guru* 76230 points
    Hi Chuhao

    You should considerthe bq7790x family of devices.

    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Prodigy 40 points

    Hi Onyx

    Thanks for your suggestion.

    I checked bq7790x datasheet. The example design schematic seems a bit complex. Also, a protector chip with less pin number is preferred in my case.

    I draw a desired schematic as below,

    The protector is mainly for overcurrent protection and short circuit protection. In normal mode, the current could reach 120A maximum.

    Battery: 4S Li-ion Battery, 

    I'm still reading bq7790x datasheet to see if it can be applied in my design. If there are any other recommendations with less pin and simpler schematic, please let me know.

    Appreciate your help.

    Regards

    Chuhao

  • 0 in reply to Onyx Ahiakwo
    Prodigy 40 points

    Hi Onyx

    I read through datasheet of BQ7790X carefully. It seems that it is used for monitor battery and each battery cell states need to be monitored.

    However, the board I'm building doesn't need to monitor battery states. It's mainly for short-circuit and overcurrent protection.

    Do you have any other recommendation?

    Thanks for your help.

    Regards

    Chuhao

  • 0
    Prodigy 40 points
    So far, the most related component I found is efuse series. But I can't find any efuse can accept Max120A current yet.