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Qi's Wireless Transfer Specification

Fredrik Johansson
Prodigy 125 points

A customer develop a product with wireless (inductive) charging. There is an annular, mobile device. It will have an inductive coil in the interior and its battery is charging when according to Qi protocol / specification (with a primary coil in the charging table as it is placed on).  the product we will use TI's bq51050 chip.
Secondary coil in the ring will have a diameter that ranges from 14 to 23 mm. My question is, will it be able to be charged with a Qi charging table, with these diameters (14-23mm)? According to Qi's Wireless Transfer Specification (from their website) is the primary coil designed in various ways: A3, A7, A8, A12, A14, A15 and A18 format (see specification). These should work with the Ring device (secondary) coil dimensions. Is it the right conclusion drawn?

  • 0
    TI__Guru* 75906 points

    Size and shape of the RX coil will impact the performance along with a number of other factors.  It is very difficult to predict performance with only a few parameters.  In the WPC specification the RX coil is given a great deal of freedom of design.