Figure 56. Power up waveforms of a STEVAL-WLC38RX and STEVAL-WBC86TX setup
YELLOW→VRECT, BLUE→VOUT, RED→AC1
8.4.2 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 STEVAL-WLC38RX were measured with STEVAL-WBC86TX as the transmitter.
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 cable.
The test setup consisted of:
• 20 W PISEN wall adapter, model A829-120167C-EU1
• USB-C power cable from Vention, model COT
• STEVAL-WBC86TX as Transmitter
• STEVAL-WLC38RX as Receiver
• Electronic load in CC mode, model BK Precision 8500.
UM3154
Typical performance characteristics
UM3154 - Rev 2
page 50/81
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