STWBC86 stops working after a few days

[S3rr4]

Hi,

I have a array of 2x5 STWBC86 on a aluminium plate to make a charging station for multiple devices. They are all connected to a common 5V source and decoupled by a small filter of Ferrite bead and MLCC.

After testing them for a while i let them rest over the weekend with no devices sitting on the chargers.

After that only a few of the STWBC86 work correctly, the rest doesn't respond to devices. I connected WPStudio and found no errors to be shown but what i found is that the device has its power stage active all the time at its ping frequency.

Best regards

Stefan

[willzhou]

Hi 

I have check default cfg,

when TX detect three occasions.

1. FOD
2. OVP
3. SYS ERR

It will disable re-ping, so TX will not ping. It need MCU/AP to clear this state and set command to "TX Start".

I have update new cfg and disable ept reason, please use this link cfg file

https://github.com/STwirelesscharger/STSW-WPSTUDIO/blob/main/STSW-WBC86FWBPP/STEVAL-WBC86TX_config_120D_BPP_NoEptReason.memh

After update this cfg file, GUI show all TX EPT Reping is disable.

[willzhou]

Based on manual

https://www.st.com/resource/en/user_manual/um3161-getting-started-with-the-stevalwbc86tx-wireless-power-transmitter-evaluation-board-for-up-to-5-w-qibpp-applications-stmicroelectronics.pdf

It maybe tx stuck in fhop feature, change frequency and stay in power-stage mode.

[S3rr4]

Hi,

if i understand correctly Fhop is enabled by default.

so you reccomend to disable Fhop feature?

Best  regards

Stefan

[willzhou]

yes, i recommend to disable  Fhop feature, attach is cfg for your test.