• State TI Thinks Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 65 subscribers
  • Views 2553 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

BQ29209 and BQ51050B: Help to choose suitable coils for wireless charge

Alone173
Expert 1225 points
Part Number: BQ29209
Other Parts Discussed in Thread: BQ51050B,

Hi all
Im doing project using TI chips for battery wireless charge.
In my project need 3.3V power supply so I used 2x18650 Li-Ion battery (3200mAhx2 - parallel conection) .
I researched on TI products and support forum to make this schematic, but i cant find an info to choose suitable wireless coil for wireless charge IC,expect the manual of dev kit of BQ51050B.
Please help me to choose it.
Thanks.

  • 0
    TI__Mastermind 25955 points
    Hi Alone173,

    I can't wait to hear more about this project, unfortunately, the bq29209 was marked in the title as the part for this post. I am moving this post so an expert on the bq51050B may respond. Thanks!

    Sincerely,
    Bryan Kahler
  • 0 in reply to Bryan Kahler
    TI__Guru 70076 points
    Hello
    The right RX Wireless Power Coils will depend on the power out, size and coil to coil distance.
    It is a good idea to start with the EVM RX coil, Vishay IWAS-4832FF-50 or IWAS4832FFEB9R7J50. This is a 48mm X 32mm coil about a 10uH L.
    The coil will need to be tuned once installed in your case and the L changes, see section 9.2.1.2.1 in data sheet.
  • 0 in reply to Bill Johns
    Expert 1225 points
    Hi Bill Johns
    Really I intend use BQ51050B to charge for 2 18650 li-ion batt with current charge about 1A. Maybe those coils you suggested are fine for this case?
    Thanks
  • 0 in reply to Alone173
    TI__Guru 70076 points
    Using the bq51050B to charge a 1A out you will need a large coil with low DCR. Above listed coils will work. In the design try to keep the coil to coil distance low for higher efficiency and better thermal performance.