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Li-Ion Battery Emulator

Ahmad Mushtaq
Prodigy 60 points

Hello,

I need to emulate the battery to evaluate my BQ51050 Li-Ion Battery Charger. In the Evaluation guide the following circuit of Battery Emulator (PR1010) is given.

Kindly explain the following points plz.

1) TBH25P5R6  is 5.6 Ohm Resistor (5R6) but the schematics shows 2.2 Ohm Resistor. So what value of resistor is to use in the design ??

2) What is the input impedance of the Li-Ion Battery ?? Two 5.6 Ohm Resistor in parallel will emulate 2.8 Ohms ?

 

  • 0
    TI__Genius 14890 points

    Ahmad,

    I have not used the PR1010 before.  I am checking internally to get more information.  I expect to reply completely on Monday.

    Regards,

    Dick

  • 0
    TI__Genius 14890 points

    Ahmad,

    The battery emulator can be configured for many applications.  The resistor value can change among the different applications.  In this case, the 2 resistors (2.2 ohms each) in parallel is correct and the 5.6 seems to be left over from the original drawing.  

    The goal of the resistors is to sink current so the power supplies do not fight against each other.

    Setting the voltage level on the power supply (battery voltage) allows the system to emulate the charger's response to the battery's changing voltage during the charge process.  This is not meant to emulate a Li-Ion battery.

    Regards,

    Dick