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Equipment and procedure for wireless charger production test

Mike Mitchell1
Intellectual 960 points
Other Parts Discussed in Thread: BQ51050B, BQ51050BEVM-764

My device uses a bq51050B and I need to design a simple production test. 

Since much of the logic is actually in the charger, it seems like a tricky requirement, especially to do quickly.

Can anyone recommend equipment and procedure for such?

Here's a short list of what I think I'm testing for:

  1. Communication with the Tx is achievable.
  2. Ability to source high charging current with a known coupling.
  3. Charge sense output goes active.
  4. Charge cutoff current sensed.

Could it be as simple as just a 2 switched resistive loads for the high and low current test?

  • 0
    TI__Genius 14890 points

    Mike,

    I expect you will be using a standard TX for testing. I would suggest an alignment fixture for a known good alignment.

    If the system power up and BAT is active, then that assures the communication is functional.  The bq51050B will not turn on unless the communication with the TX is successful.

    Resistive loads will not work.  The bq51050B requires a battery emulator of some kind.  Without that, the bq51050B will terminate power transfer.  Generally, I use a source meter to test the maximum current and termination current.  The maximum current is tested by setting the battery (source meter) to 3.5 to 4.0 V.  Once that is confirmed, the termination current can be tested.  This is done by increasing the battery voltage to the termination voltage (4.2V in the case of the bq51050B.

    I have also used a circuit as shown in "Figure 3.  Battery Emulator" from the bq51050BEVM-764 User's Guide.  Connect the BAT pin to the BAT+ of the emulator and a power source to the PS#2 + / -.  Changing the PS#2 supply as with the source meter will emulate fast charge and termination.

    In both cases, control of the power supply is required.

    Regards,

    Dick