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BQ25792EVM: BQ25792EVM: Battery Simulator vs Actual Battery Pack

MUHAMMED RAFI
Intellectual 265 points
Part Number: BQ25792EVM
Other Parts Discussed in Thread: EV2400

Hi TI expert,

I am looking to evaluate the BQ25792EVM to charge a (3S  12.6volt,20Ah ) Li-Ion battery pack. Upon reading through the evaluation module data sheet I noticed that it is suggested to use a battery simulator. I am using EV2400 is the software interface from PC to evaluation module. My question is, is it required to use a battery simulator or could I just use an actual battery pack?. Would using an actual battery pack cause damage to the evaluation board?

Thank you

Regards, 

Muhammed Rafi C K

  • 0
    TI__Guru**** 165986 points

    Hi Muhammed,

    No. You should eventually test with an actual battery pack even if you start with a simulator.  A simulator makes it easier to take instantaneous measurements or speed up the charge profile.  The EVM provides a 10kohm resistor as a substitute for the pack thermistor.  You will need to remove a jumper if your pack has thermistor.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Intellectual 265 points

    Hii Jeff,

    Thank you for your replay, please give solution of below doubts, 

    I am considering the battery simulator as the alternate option given in the evaluation module BQ25792EVM,

    Alternative Option: A 0–20 V/0–5 A, > 60-W DC electronic load set in a constant voltage loading mode in parallel with a second power supply can be used. The second power supply is set to a voltage slightly below the electronic load's constant voltage setting. When enabled, the charger's charge current then replaces the current provided the second power supply.

    In my application we are using battery of 3s 12.6Volt Lithium ion battery with 2A charging current, for this battery requirement implementation I have two doubts,Then 

    1)what is the set value of constant loading voltage in electronic load is it minimum battery voltage 11volt or maximum battery voltage 12.6volt?

    2)also what is the set voltage in the secondary power supply which is in parallel with the electronic load?

    Regards,

    Muhammed Rafi C K

  • +1 in reply to MUHAMMED RAFI
    TI__Guru**** 165986 points

    Hi Muhammed,

    The eLoad CV level is the battery voltage that you want.  The parallel power supply is only needed to get the charger started charging.  Once started, you can lower the parallel supply voltage or even turn it off.

    Regards,

    Jeff