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Regarding Battery charger circuit and fuel gauge

Vismita Jani80
Intellectual 385 points
Other Parts Discussed in Thread: BQ28Z610, BQ24650, BQ294502

Hi All,

We are working on one solar panel based project. In that project we have to charge our battery using Solar Cell.

For that we are planning to use one charge controller for charging battery through solar panel and one battery monitoring IC for measure the health of the battery.For battery charging cirvcuit we plan to use BQ24650 charge controller and for battery health monitoting we plan to use BQ28Z610.

Now we want to know that if we use these two IC's then we have required any other external protection circuit ;ole PCM for battery?

We refer data sheets of both the parts.As per datasheet these IC's have over voltage and current protections.

Please guide us in this matter.

Thanks in advance.

Vismita Jani

  • 0
    TI__Expert 8690 points
    Hi Vismita,

    As for the bq24650, the only concern is that you need to allow the IC to detect the battery through the SRN pin. Without this detection, it will give a fault that prevents the charger to start switching.

    I think you have enough battery protection with the gauge.

    Thanks,
    Steven
  • 0 in reply to Steven Bangdiwala
    Intellectual 385 points
    Hello Steven,

    Thank you for your response.

    As per your reply the we referred BQ28z610 and its provide all protection like PCM circuit. So PCM circuit is not needed in our case does our under standing is correct?

    As you know we are working on solar panel based project. In this project solar panel used for charging the battery.

    As per the Datasheet And EVM user guide of BQ28z610 the PACK+ and PACK- are connected to the power supply/system load. So in our application it is connected to the output of the charge controller BQ24650 and after that battery is connected to the VC1 pin of BQ28z610 And VC2 pin of BQ28z610 is short with the VC1 because we are using single cell battery.So finally It means Fuel gauge is connected between Charge controller and Battery. Are we going in correct direction? please guide us in this scenario.

    Thanks,
    Vismita.
  • 0 in reply to Vismita Jani80
    TI__Expert 8690 points
    Hi Vismita,

    For bq24650, as long as our charger can detect the battery (any path that connects the battery to SRN), then it will work. The bq28z610 PACK+ and system should be connected to bq24650 SRN, and the battery at bq28z610 VC1. I suggest you take confirmation from the fuel gauge forum about the configuration of the bq28z610.

    Thanks,
    Steven
  • 0 in reply to Steven Bangdiwala
    TI__Guru* 76230 points

    Hi Visimita,

    I suggest you take a look at the reference schematic contained in the user guide for the bq28z610. The pack + terminal on the EVM is the point where you connect both the positive terminal of the charger as well as the load.

    The bq28z610 does have firmware controlled overvoltage protection as well as hardware analog overvoltage protection whose response is faster than that of firmware's. For additional battery safety, our reference design in the user guide included an additional overvoltage protection IC, bq294502 chip which  has the ability to blow  a chemical fuse once the overvoltage threshold programmed is crossed. This is usually a non-recoverable one way process for the end user and is usually the last line of resort/level of protection.

    I hope this helps.

    thanks

    Onyx

  • 0 in reply to Onyx Ahiakwo
    Intellectual 385 points

    Hello Steven and Onyx,

    Thanks for your reply.

    This information is helpful for us.

    Vismita.

  • 0 in reply to Vismita Jani80
    Intellectual 385 points

    Hi All,

    Please suggest me the solution regarding my above question.We are waiting for the update.

    Thanks,

    Vismita.

  • 0 in reply to Vismita Jani80
    TI__Guru* 76230 points

    Hi Vismita, 

    I believe we responded to your questions already. Is there any unanswered part you needed addressed?

    thanks

    Onyx

  • 0 in reply to Onyx Ahiakwo
    Intellectual 385 points

    Hi Onyx

    Thank you for the help.

    Thanks

    Vismita