P9415-R Datasheet

© 2021 Renesas Electronics Corporation

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May 4, 2021

9.11.2 FOD Parameters in Transmitter Mode

For a WPC power loss foreign object detection to function effectively, the transmitter must set the FOD threshold at a reasonable value by

accounting all its known losses such as Coil resistance loss and losses because of metal around the coil integrated into the product. In the

power transfer phase, the P9415-R will continuously calculate the difference between its measured transmitted power and RPP packet

information received from the receiver. If the difference is higher than the FOD threshold, the P9415-R presumes that there is a foreign object

(FO) between Tx and Rx that is absorbing the transmitted power and will stop the power transfer to avoid heating of FO.

FOD threshold value changes based on the Received Power Packet value (RPP) from the receiver. In the default configuration, If RPP is larger

than 3700mW (FodSegThd), the FOD threshold is -100mW (FodThdH) and if RPP is less than 3700mW, the FOD threshold is 800mW

(FodThdL)

The FodSegThd, FodThdH, and FodThdL are configurable by config table in MTP using the P9415-R Wireless Power Pro GUI.

FODcriteria:FODthreshold>TransmittedPower(PPT)–ReceivedPower(RPP)

9.11.3 FOD Parameters Configuration with P9415-R GUI

The default values of the FOD parameters in MTP can be configured by the following procedure.

1. Provide external power supply (+5V) on the P9415-R VOUT pin.

2. Launch the P9415-R Wireless Power Pro GUI after connecting WPD–USB-DONGLE to the computer.

3. Click #1 to connect the GUI with the P9415-R device and the P9415 device name in should be displayed at #2 on the successful connection.

4. Click the Config Icon in #3 and the Read Default Parameters in #4.

5. Enter new FOD parameter values and click Configure Parameters to MTP

6. Remove the external power supply and place the receiver with P9415-R on the Nok9 transmitter or a target transmitter and verify if new

parameters.