4.17 PID tuning
Power regulation of the power transmitter is controlled by a PID algorithm, as defined by the Qi specification. The
default scaling factors for the respective parts are set according to the topology used – A11a in the case of
STEVAL-WBC86TX.
Application specific requirements may demand adjustments in the topology, such as coil design or the input
voltage (also defined by the topology specification). However, modifications to the circuit may affect the PID
regulation performance, and consequently, may (or may not) require adjusting the PID parameters.
For example: for a 6 V input voltage, the PID regulation may be too aggressive to achieve a stable regulation
loop. Decreasing the scaling factors may improve the performance by slowing down the loop but may adversely
impact other aspects of the regulation. Therefore, thorough testing is necessary after any adjustments to the PID
parameters!
The PID parameters can be found and adjusted in the Tx PID Regulation part of the TX Registers tab.
Figure 58. PID parameters
UM3161
PID tuning
UM3161 - Rev 1
page 44/78
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