IEEE Electrification Magazine - March 2016 - 39
Failure of equipment,
unlike in most
commercial
applications, can,
in many situations,
be the difference
between life
and death.
200-kW SiC Motor Drive
The high power demand in certain
military applications leads to higher
power loss in the devices as well,
which eventually manifests in the
form of temperature rise. To minimize
losses and reduce thermal-management needs, it is extremely important
to maintain high efficiency and
enhance it wherever possible and also
to use components and systems that
can withstand high temperatures. The
use of WBG semiconductor materials
for power electronics contributes to
achieve this (Shenai et al., 2014; Shenai, 2000). The next work described relates to a 200-kW
SiC-device-based motor drive. The system block diagram
is shown in Figure 8. The external configuration of the
power electronics unit is shown in
Figure 9.
High-Temperature Control Circuits
The gate-driver printed wiring assemblies (PWAs) and gate-driver power
supply PWA prototypes of the aforementioned system were successfully
built and tested. Both the drive and
power supply were tested for at least
75 h at the maximum expected ambient temperature, 20-kHz switching frequency, and 50% duty, using dummy
loads for the gates. The gate driver produced excellent waveforms with the
dummy loads, as shown in Figure 10. The waveforms shown
here are for one switch of one module (16 junction fieldeffect transistors) and are similar for the other switches.
Current Data for 20110823_DCC10_lane_change_100 C_200 sA.csv
300
Ibatt
Idc
Iext
250
Current (A)
200
150
100
50
0
-50
-100
-150
20
40
60
80
100
120
Time (s)
140
160
180
200
100
100
99
99
98
98
97
97
Efficiency (%)
Efficiency (%)
Figure 6. Battery and bus current during a simulated lane change at 100 °C.
96
95
94
60
93
80
92
90
91
100
90
0
30
60
90
120
150
180
96
95
94
60
93
80
92
90
91
100
90
0
30
60
90
120
Load Power (kW)
Load Power (kW)
(a)
(b)
150
180
Figure 7. The overall efficiency, including control power losses, in (a) boost mode and (b) buck mode.
IEEE Electrific ation Magazine / March 2 0 1 6
39
Table of Contents for the Digital Edition of IEEE Electrification Magazine - March 2016
IEEE Electrification Magazine - March 2016 - Cover1
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