• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 63 subscribers
  • Views 598 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

A10 as receiver coil

Sean Can
Prodigy 70 points
Other Parts Discussed in Thread: BQ51013, BQ500210

Hi,

I am trying to use off the shelf A10 coil (24uH)  as the receiver for a WPT solution. I am using bq51013 at the receiver side and bq500210 at the transmitter side.I use A10 coil at the transmitter side too. Every thing works fine until I react a load current of 600mA at which point voltage at RECT goes below 5.1V and the bq500210 shuts down. I want to go to 1A load current. I see that as the current increases( from 0 to 600mA) switching frequency increases. Is this normal? and since I do not have any control over the control strategy implemented in the transmitter side how do I go to 1A load with A10 coil.  

I also made a coil myself which has a lower self inductance (14uH) and it works fine. I can go to 1A load current. But not with A10 coil in the receiver. So I know that the circuit is not the problem.

What can I do to solve this problem?

Regards,

Sean

  • 0
    TI__Mastermind 32400 points

    Hi,

     24uH inductor for the receiver is high, please use lower values to around ~10uH and make sure to tune the resonant caps as well in the receiver side.  

     Thanks

    Tahar

  • 0 in reply to Tahar Allag
    Prodigy 70 points

    Dear Tahar,

    I have selected proper capacitors on the receiver side as per the WPC specification document. Moreover if you look at the document (http://www.ti.com/lit/an/slyt479/slyt479.pdf) which I used to design the receiver side, in table 1 on page 4, it is mentioned that a coil with dimensions 35X35 which has L22 of 22uH can be used to transfer 5W but I am only able to reach 3W (i.e., 5V and 0.6A). Could you please clarify? Is there a specific reason to use receiver coil lower than 10uH to reach a power transfer of 5W because this is something which is not very clear to me from the documents that I have read. 

    Thanks for the quick reply.

    Sean

  • 0 in reply to Sean Can
    TI__Mastermind 32400 points

    Sean,

     Please work with the local TI sales office to provide you with design guidelines documents.

     Tahar