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Question about bq51021

Satoshi
Guru 19595 points
Other Parts Discussed in Thread: BQ51021

Please let me know about bq51021 (see below).

--------------------------------------------------------------

①If battery doesn't connect to output (open), What happens?

 Case 1：it isn't connected from first.

 Case 2：a connection came off on the way.

 Is it different?

②Is I2C possible to read the device ID and recognize the IC?

③Until at most how many hours can bq51021 charge continuously?

(Even how many hours a day can bq51021 move?)

④Is bq51021 measure about inlush current when start to output?

⑤Which is overcurrent / overvoltage protection, latch or a retry?

⑥When TX/RX's distance are border where a charge is possible / impossible, what kind of movement is done?

--------------------------------------------------------------

 

Best regards,

Satoshi

 

  • 0
    TI__Genius 14890 points

    Satoshi,

    1. The bq51021 is effectively a wireless power supply.  If there is no load, the output is still stable and just waiting for a load.  If a load is added, the device will respond.  The output of the bq51021 is not enabled until connection to a wireless transmitter is confirmed and the bq51021 is stable.  The output is then turned on.  If a load is present, the bq51021 adjusts it's frequency to supply the appropriate power level.  If the load is removed, the bq51021 adjusts it power level to no load.

    2.  The register maps in section 8.5 shows the registers that can be read and written.  The correct I2C address must be used to communicate with the device.

    3. Since the bq51021 is a power supply only, a separate charger is required.  The bq51021 will continue to supply power as long as it is needed.  The external charge will determine any time limit.

    4. The inrush current is not specifically measured.  The RECT and OUT capacitance values will impact the response to inrush currents.

    5. Over-current and over-voltage are event based and not latched.

    6. I am not sure I fully understand your question, but here is some information that may help.  As the alignment of the RX and TX is changed, the power level must be maintained so the RX communicates with the TX that more power is needed (a result of the change in the magnetic field).  This is the same as with any change in the power level.  The RX is responding to the need for more power - not the change in the magnetic field. As the mis-alignment is increased, the TX power needed to generate the same RX power continues to increase.  The communication levels will decrease (as a result of the magnetic field strength weakening).  In general, the failure at the end of the power transfer will be due to communication failure. 

    Regards,

    Dick