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BQtesla EVM

Alexander Dobranich
Prodigy 30 points
Other Parts Discussed in Thread: BQ500110, BQ500210

I am trying to extend the range that the coils of the BQtesla will transmit over.  I believe the EVM detects when the receiver is not receiving power above some threshold determined by the IC. I want the transmitter to to not turn off when the receiver is ~2cm away. There is s pin labeled CoilDis. I believe this turns on a transistor to ground out the primary coil and hence discontinue power transfer. I tried removing the resistor that connected this transistor to the power path to the primary coil. It cause the TPS-715A01 to burn out. Are there any other suggestions to increase the range of these coils, reduced power transfer is acceptable. Thanks.

  • 0
    TI__Prodigy 620 points

    Hello Alexander,

     

    The CoilDis function is used to dump the coil oscillation during Analog Ping.  The function is only present in BQ500110 EVM and there is no such function in BQ500210.  Making changes to the resistor value will not improve the operating range.  There is no provisions in both controllers to run them without the feedback loop.

    The range of wireless power is mainly function of coil dimensions and the core shape.  The reliable power transfer is usually facilitated when distance between coils doesn't exceed 1/4...1/2 of the coil diameter for flat coils.  The BQTesla kit coils are not designed with intend to cover  distances greater than 5mm rather provide low profile.  To experiment with greater distance you may like consider designing different coils using different shield/core shapes.

     

    Best Regards,

    Vladimir Muratov

    vladimir_muratov@ti.com

    603.222.8664