A battery system solution. Can I combine these all together?

The application is a system using a 10-cell NiMH battery pack. It should have push-on button, battery over-discharge protection, battery charging circuit, fuel gauge etc.

For battery charging part, i choose LTC4011, please see its demo board circuit below

 

For the push-on button and battery protection part, please see the picture below.

Can I put these two part of circuits all together?

Do I put the second part of the circuit into System Load socket "E1" in the picture 1?

For picture 1, when no Voltage Vin, I assume the battery will support the system load working? Is that right?

Thanks and kind regards,

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  • Zack wrote:

    Hello,

     

    So you want the push button to switch on the system load regardless of which source is powering the system load, correct? And you want protection against over-discharging the battery? Do you need the reverse battery protection feature as well or will your battery be non-removable from the product?

    Yes, push button controls system load ON/OFF.

    Yes to over-discharging.

    Not design for reverse battery protection yet.

    Battery will stay inside the enclosure with the system load.

     

    If you do not need reverse protection or the over-voltage protection, a simple solution could be to have your whole system output rail pass through the LTC2955-1/LTC4231 circuit; as in: E1 would be the input to the LTC2955-1/LTC4231 circuit (instead of the battery) and your system load would be powered by Vout of the LTC2955-1/LTC4231 circuit. That should give the operation that you want.

     

    The problem with how it is now is that only the battery passes through the LTC4231, so the push-button has no effect on the VIN supply powering the load and there is no way to cut it off. The configuration discussed in the previous paragraph addresses that.

    The idea is that as soon as the charger is plugged-in, the battery will start charging. No switch for this charging circuit. But I assume the charging circuit IC LTC4011 will control the charging process when fully charged, it will shut down the charging process. Am I right?

     

    Let me know if that is suitable to you.

     

     

    Regards,

     

    Zack

Reply
  • Zack wrote:

    Hello,

     

    So you want the push button to switch on the system load regardless of which source is powering the system load, correct? And you want protection against over-discharging the battery? Do you need the reverse battery protection feature as well or will your battery be non-removable from the product?

    Yes, push button controls system load ON/OFF.

    Yes to over-discharging.

    Not design for reverse battery protection yet.

    Battery will stay inside the enclosure with the system load.

     

    If you do not need reverse protection or the over-voltage protection, a simple solution could be to have your whole system output rail pass through the LTC2955-1/LTC4231 circuit; as in: E1 would be the input to the LTC2955-1/LTC4231 circuit (instead of the battery) and your system load would be powered by Vout of the LTC2955-1/LTC4231 circuit. That should give the operation that you want.

     

    The problem with how it is now is that only the battery passes through the LTC4231, so the push-button has no effect on the VIN supply powering the load and there is no way to cut it off. The configuration discussed in the previous paragraph addresses that.

    The idea is that as soon as the charger is plugged-in, the battery will start charging. No switch for this charging circuit. But I assume the charging circuit IC LTC4011 will control the charging process when fully charged, it will shut down the charging process. Am I right?

     

    Let me know if that is suitable to you.

     

     

    Regards,

     

    Zack

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