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BQ24610

Jatin Munjal
Prodigy 120 points
Other Parts Discussed in Thread: BQ24610, BQ25060EVM

I am using Bq24610 for charging Li-ion battery. In the EVM of Bq24610 We require 3 power supplies and 2 loads. But Traditionally in charger circuit we can use only 1 power supply for input and we can use output for battery charging. Please tell me reason for the same.

Power Supplies
1. Power Supply #1 (PS#1): a power supply capable of supplying 30-V at 5-A is required.
2. Power Supply #2 (PS#2): a power supply capable of supplying 5-V at 1-A is required.
3. Power Supply #3 (PS#3): a power supply capable of supplying 5-V at 1-A is required.

Load

1. A 30V (or above), 5A (or above) electronic load that can operate at constant current mode

2. A Kepco bipolar operational power supply/amplifier, 0 ±30V (or above), 0 ±6A (or above).

  • 0
    Prodigy 120 points

    Also tell me an alternate for the Loads.

  • 0 in reply to Jatin Munjal
    TI__Mastermind 32410 points

    Hi Jatin,

     The first power supply is used as an input.

     The second power supply is used to TS (Temperature Sensor) pin. This IC monitors battery temperature by measuring the voltage between the TS pin and GND. this is done by using a thermostat in the battery pack. The controller inside the IC compares this voltage against its internal thresholds to determine if charging is allowed. To initiate a charge cycle, the battery temperature must be within the VLTF (2.4V) to VHTF (1.221V) thresholds. If battery temperature is outside of this range, the controller suspends charge and the safety timer, and waits until the battery temperature is within the VLTF to VHTF range. Thus the second power supply is used to control the voltage of this pin to allow charging with the appropriate voltage range. Please read the datasheet for more info on how the part work.

     The third power supply is used for battery Emulator. In your case you can use a real battery.

     -Tahar 

  • 0 in reply to Tahar Allag
    TI__Guru 56650 points

    Load 1 is connected to system to simulate the system load. So, it can be an electronic load or resistor load.

    Load 2 is connected to BAT output to simulate a battery. So, Load 2 should be an active load which can source or sink a current. If you don't have a bi-direction source. You can make a battery simulator from a voltage soure and a load. The setup is similar as figure 3 of bq25060EVM user's guide: http://www.ti.com/litv/pdf/sluu438