This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

  • TI Thinks Resolved

BQ501210: Different Tx tuning and minimal operational coupling coefficient

Part Number: BQ501210

Hello All,

i am using the BQ50120EVM as Transmitter and BQ51050EVM 764 as Receiver.

1) What is the tuning method for using different Tx with the  BQ50120EVM

Currently there is a 247nF capacitor (designators C16,C11,C19) and the inductor = 10uH.

it is not fit the operational frequency of 125kHz.

so what is the exact formula for tuning?

2) how can I increase the operational distance ?

I can give each up efficiency and i can give up compliance with the Qi standard 
In other words what can be done in the EVM HW wise in order to work in larger distance (currently even 12-13 mm is not an option) even in the cost of working at 10-20% efficiency and without compliance to the Qi standard.

3) what it the minimal coupling coefficient  (k) that the system is working with.

Thanks

Igor

  • Hello,
    Any ideas anybody?
    Thanks
  • In reply to IGOR GINDIN:

    We do not have any recommendations to increase the coil to coil distance for bq501210. The device has only been tested with standard WPC medium power coil and this will give a limited charging area.
    Your RX is a 5W bq51050 and other TX in the 5W range may provide better performance.

    Best Regards,

    Bill Johns,  Applications Engineer

    Texas Instruments Inc

    Dallas, Texas

    Please click "This resolved my issue" button if this post answers your question.

    For more information on Battery Charger Solutions see Link

  • In reply to Bill Johns:

    it means that smaller TX power (5W) will provide better operational range? isn't it quite counter intuitive?
    what about question 1) and 3)
    Thanks

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.