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EM1402EVM: Single board with Cell to pack

Kostadin Petkov
Prodigy 40 points
Part Number: EM1402EVM
Other Parts Discussed in Thread: BQ76PL455A, EMB1499Q

Hi there, we are manufacturer of Low Voltage 48V 16s LiFePo4 Energy Storage solutions and currently developing replacement of our old Bms (MAX14921 with passive balancing) to active balancing,  What is the easiest conversion from the existing design of EM1402EVM to work in single BMS board mode and capable of moving energy from pack to cell and cell to pack. Also is it possible to use EM1402EVM without 12 battery in stack with 2 or more BMS to transfer cell to 12 and 12 to cell (PACK(n) cell (m) to PACK(o) cell(p))?

  • 0
    TI__Genius 17370 points
    Hi Kostadin,

    I am a little confused by your questions, the EM1402EVM reference design guide is located here: www.ti.com/.../tidubz7.pdf to get further information on this solution. If I understand correctly, yes you can balance to and from the battery pack but you need a 12V source of some kind to power the EMB1428. I recommend reading up on the EMB1428 and 1499 datasheets before diving into a design with these parts. We are moving away from recommending this solution due to complexity and cost and would recommend using a bq76pl455a with passive balancing or the bq79606A with passive balancing.

    Regards,

    Taylor
  • 0 in reply to Taylor Vogt
    Prodigy 40 points
    Got it, sorry about not completed question. Did read manual for the board, my confusion come from the datasheet of EMB1499Q Bidirectional Current DC/DC Controller where on the example at the floating side of the DC-DC is the pack voltage not 12V . I will appreciate your help to design floating pack voltage at the primary side of EMB1499Q which will be connected to the pack voltage for single board BMS 16S, and in case of connection on stack to share same isolated bus voltage for cell to cell transfer. Please suggest Driver and Transformer for 60Vmax pack voltage. we are using LiFePo4 16s
  • 0 in reply to Kostadin Petkov
    TI__Genius 17370 points
    Hi Kostadin,

    As I mentioned we are moving away from recommendations using this design so I will have to point you to our reference schematic/design guide for information related to new designs. This link to the TI design provides an example transformer etc. in the reference schematic: www.ti.com/.../TIDA-00817. We can take a look at your design to give feedback down the line if youd like.

    Best Regards,

    Taylor
  • 0 in reply to Taylor Vogt
    Prodigy 40 points

    Hi Taylor, 

    Thanks for the reply. Will send you our design soon when ready.