5.2.3.1 Frequency
Current operating frequency. Adjusted by Tx PID controller to set the operating point according to CEP from Rx.
The operating point is also set by bridge voltage and duty cycle.
5.2.3.2 Duty cycle
Current operating duty cycle. Adjusted by Tx PID controller to set the operating point according to CEP from Rx.
The operating point is also set by bridge voltage and frequency.
5.2.3.3 Bridge voltage
The voltage used by the main H-bridge to power the transmitting coil. The PID of the transmitter can be adjusted
to set the operating point according to the CEP from the receiver. The operating point is also set by the frequency
and duty cycle. The bridge voltage is affected by the input voltage and the DC-DC buck/boost.
5.2.3.4 Control error
The value of the control error packet (CEP) sent by Rx. The mechanism used by Rx to increase or reduce
transmitted power according to the Rx load change.
5.2.3.5 Rx reported power
This value is reported by Rx via received power packet (RPP). The value of power received by Rx plus Rx losses
compensation. Used to calculate the FOD metric and detect the presence of foreign object based on the metric.
5.2.3.6 FOD margin
This metric is used to detect foreign object presence between the Tx and Rx coils.
The metric is based on Rx reported power and transmitted power measured by Tx. The metric is also dependent
on Tx FOD tuning.
5.2.3.7 Coil current
The current going to main Tx coil measured on sensing resistor R408.
5.2.3.8 Supply voltage
Voltage level measured on VIN pin of STWBC2.
5.2.3.9 Coil temperature
The temperature measured by the onboard NTC. In case of the STEVAL-WBC2TX70 evaluation board, the NTC
is placed next to the electrolytic capacitors of the DC-DC boost circuit.
5.2.3.10 Current state
The device state machine related to power transfer status.
5.2.3.11 Presence detection 1 and 2
The result of analog ping. The Presence detection 1 metric is based on Q factor measurement, while Presence
detection 2 metric is based on its change. Low values indicate no object present, while very high values might
indicate the presence of an FO. This value is not updated during power transfer
5.2.3.12
RefQFactor
Reference Q factor reported by Rx in the FOD/qf packet. Valid only for EPP. Compared with the measured Q
factor for FOD.
5.2.3.13
MeasQFactor
Value of Q factor measured after successful analog ping. This value will then be compared with RefQFactor
value. If the difference is more than a set tolerance, the Quality factor measurement based FOD (QFOD) is
triggered.
UM3286
Graphical user interface (GUI)
UM3286 - Rev 1
page 34/84
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