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Contemporaneously charging 2 different target devices from 1 single wireless charger

iRob
Prodigy 20 points

Hi everybody

I understand that a single transmitter can communicate with a single receiver at a time, so my idea is to build a wireless charger using 2 controllers; the end user will be typically charge two independent devices at the same time with this "double-charger", and the two target device will be on opposite sides of the charger, "sandwiching" it, typically aligned on a common axis.

My idea is to place the two transmitting coils back-to-back, with an interposed shield; the total thickness of the wireless charger should be under 1 inch.

My questions are:

  1. Can two independent controllers coexist on the same board (or maybe just in the same space)? 
  2. What are the constraints (minimum distance, shield characteristics, ...) to allow them to operate correctly?
Thanks,
Roberto
  • 0
    TI__Prodigy 620 points

    Hello Roberto,

     This is an interesting idea.  Two convertors can coexist on the same board and you can position coils facing into opposite directions.  Ideally you may like keeping the air gap between the ferrite cores to avoid interference.  Using the gnd plane under either ferrite core can also help. This type of wireless chargers relies on relatively tight coupling between transmitting and receiving coils and magnetic field strengths is low outside the space between the coils.

    Regards,

    Vladimir

  • 0 in reply to Vladimir Muratov
    Prodigy 20 points

    Thanks a lot Vladimir for your reply.

    I have to admit that my questions were poorly formulated: when I asked about two converters on the same space, I was instead meaning if any problem could arise from their coils being too close to one another, but I see that you got it right anyway!

    Do you believe that the two transmitter coils will not interfere with one another in absence of the correspondent target coil?

    What if just one target coil is present? I think that the shield between the two transmitter coils together with the distance between the target and the farther transmitter should make the "unwanted" coupling low enough to render it irrelevant; is it  right?

    Thanks again,

    Roberto