BLE AOA/AOD Asset Tag - Wireless charging coil matching
- 한원섭
- Jan 12, 2024
- 1 min read
We are developing BLE AOA/AOD Asset Tag.
I will post the wireless charging coil matching work.
Coil matching work may seem complicated, but it is not actually difficult. I think it's a bit of a laborious task.

I used the TI wireless charging IC, BQ51050B_VQFN.
Check specifications
Coil specifications: 26uH, 520m ohm

BQ51050B capacitor calculation method

Important!!
Ls' refers to the series inductance of the receiving coil antenna in an environment where a WPT receiver is placed on a WPT transmitter, and Ls refers to the inductance of the receiving coil antenna in an environment where the WPT transmitter is removed.
Apply the calculated value below


Check charging
I assembled and tested the board using the confirmed C1 and C2 capacitor values.
As per the results, we confirmed that charging is progressing well.

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