GSWP100W-EVBPA
GaN E-HEMT Wireless Power Transfer Evaluation Board
User’s Guide
_____________________________________________________________________________________________________________________
GSWP100W-EVBPA Rev 180529
© 2018 GaN Systems Inc.
www.gansystems.com 23
Please refer to the Evaluation Board/Kit Important Notice on page 26
Figure 22 •
Spectrum plot of output terminal JP57 SMA after 49.66dB attenuation at 100W output power
The output power and efficiency with an EMI filter are shown in Figure 23. This PA design delivers 90%
efficiency at 100W output power and 31V
DC
input voltage. This efficiency performance is lower than the
one of without EMI filter due to the insertion and mismatch loss from the EMI filter. The design of EMI
filter is
optimal at 30 Ω, but the data is taken at 50
Ω.
Figure 23
•
GSWP100W-EVBPA power (W) and efficiency (%) plotted against input voltage at 50
Ω l
oad
The SEEK thermal camera photo of the PA is depicted in Figure 24. The thermal performance with EMI
filter is very impressive. The hottest points of the circuit are the two 2
nd
harmonics shunt inductors which
have a temperature rise of 35˚C.
The temperature rise of the GaN devices is a modest 3
˚
C.
50.0%
55.0%
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
0
20
40
60
80
100
120
10
15
20
25
30
35
Eff(
%)
Po
ut(
W
)
Vin(V)
100W WPT PA Pout(W) & Efficiency(%) with EMI filter
Pout(W)
eff(%)
