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bqTESLA coil with hole

Other Parts Discussed in Thread: BQ500210, BQ51013B, BQ51013A, BQ51003, BQ51020, BQ500212A

Hello,


I try to find solution for my project. Qi-compliance is not required.

Power has to be provided to rotating element (RX side). On TX side I will have motor which shaft will rotate RX part. This is why I need TX and RX coils with at least 8 mm hole in the middle for the shaft, coils should be around this shaft (RX coil will rotate above fixed TX). Do you know such a solution which could provide at least 3W (@ 5V best).


Best regards

Daniel

  • Daniel,

    I do not see an issue with an 8mm hole in the middle of the RX and TX coils. We have not done a rotational implementation, but believe it will work. The only concern might be shielding on the coils and shielding of the axle. Do you know the rotational speed?

    Regards,

    Dick
  • Dick,

    now I see that it is possible to find coils without neodymium magnet in the middle, so it looks like 8mm hole is possible.
    The problem with shielding is because ferrite plates don't have holes? It may be not easy, beacause ferrite is very fragile, but I could try to prepare hole in it. The question is how it affects shielding and coupling?
    Rotational speed is only 120rpm.

    Best regards
    Daniel
  • Daniel,

    I will contact you off-line to offer a vendor name that might be able to help with the shielding.

    Regards,

    Dick
  • Hi Dick,

    I have to wait for answer from coils vendor. But besides coils I need controllers and I would like to test them as soon as possible with EVM :) Is it good idea to choose them, when I don't have coils?

    For receiver part I think BQ51013A or BQ51013B could be good (I don't see big difference, only WPC 1.0 and WPC1.1 compliance?), because they are in VQFN package and have 5V output. What kind of transmitter I could use, BQ500210 like in BQ51013BEVM test setup (information from User's Guide)?

    Best regards
    Daniel
  • Daniel,

    To recommend the correct RX and TX, I'd like to get a bit more information.  What power level will be required from the output of the RX?  If it's less than 2.5W, I would suggest the bq51003.  If it's closer to 5W, there are several options, including the bq51013B. As you note, the bq51013B is compatible to WPC v1.1.  We also have devices with programmable output voltages (bq51020 for example).

    What voltage will be available for the transmitter?  The bq500212A is a very nice 5V solution that works well with the bq51003 or bq51013B (and all of our other RX solutions).

    What about charging?  Will this need to charge a battery or only be used as a power supply?

    Regards,

    Dick

  • Hi Dick,


    I estimate that required power is a bit higher than 2.5W and should not exceed 5W. If bq51013B is good option then I will choose it, because of package (not BGA).

    For transmitter 5V input will be available, so I think I can try bq500212A (not BGA :) ).

    I need to use it only as power supply, not battery charger.

    Best regards

    Daniel

  • Daniel,

    Yes, the bq51013B and bq500212A will be a good solution.  Let me know if you have more questions going forward.

    Regards,

    Dick