5.2.2 Efficiency and spatial freedom in the XY plane
Efficiency is one of the most important metrics of wireless charging performance evaluation. Spatial freedom, size
of the area in which a power receiver can be placed on the power transmitter, which still allows sufficient power to
be transmitted, is another important metric.
Efficiency and spatial freedom of the STEVAL-WBC86TX were measured with STEVAL-WLC38RX as the
receiver. The efficiency was measured from the transmitter DC input to the receiver DC output. The measurement
does not include any power losses in the wall adapter or the USB Type-C® cable.
The test setup comprised of:
• 20 W PISEN wall adapter, model A829-120167C-EU1
• USB Type-C® power cable from Vention, model COT
• STEVAL-WBC86TX as transmitter
• STEVAL-WLC38RX as receiver
• Electronic load in CC mode, model BK Precision 8500.
The maximum efficiency achieved with this setup was 81%.
Efficiency curves for various misalignments in the X and Y axis are shown in the figures below:
Figure 60. X, Y axis for misalignment
UM3161
Typical performance characteristics
UM3161 - Rev 1
page 47/78
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