IEEE Power Electronics Magazine - June 2022 - 84

underlying physical mechanisms that
bring the device to failure The SC
robustness is a very important feature
of power transistors, strictly
required by several applications (e.g.,
motor drives, power trains, inverters
and more). The common minimum
requirement is to withstand a shortcircuit
duration of 10-μs. During a
SC the device must be capable of a
high-power dissipation, that eventuPhase:
III
2
ID
1
VDS
4
VGS
-4
1
tAVA = 3.7 µs
IAVA = 510 mA
0.5
IG
02 46 8
Time (µs)
(a)
300 400 500 600
Bus Voltage (V)
(b)
FIG 2 (a) Avalanche robustness of vertical GaN devices.1 (b) Vertical GaN devices meeting >10 µs short-circuit2 capability.
700 800
20
III
BVAVA = 1,470 V
IAVA = 510 mA
0.5
30
ally leads to an excessive self-heating
related failure. For transistors, the
most commonly occurring extreme
condition is the hard-switching short
circuit when the device voltage is up
to the circuit bus voltage.
A short circuit (SC) test is a widely
used criteria for power device, and
10 μs is the usual minimal time that
most over-voltage protection circuits
can step in to protect (e.g., commerIV
1
40
GaN
Fin-JFET
p-Gate HEMT
Cascode HEMT
GIT
cial gate driver for HV Si IBGT).
Hence, it is desired that the power
semiconductor device has the capability
to withstand 10-μs SC under the
same bus voltage for device switching.
So far, no wide bandgap material
has ever demonstrated this capability
and the only semiconductor device is
a silicon based IGBT that shows
>10 μs SC. SiC is generally believed to
be not able to meet this standard
10
SiC MOSFET
Si CoolMOS
ac Input
Discrete Time
Control
dc Output
20 W-5 Kw
Soft Start
Low-Load Management
Low Standby
Power
Scalability
Metrology
Capability
Intelligent EMI Control
Computing LED Lighting
Data Centers
FIG 3 The NexGen scalable and software configurable power platform.
84 IEEE POWER ELECTRONICS MAGAZINE z June 2022
Electric Mobility
Energy Production
VGS (V)
VDS (kV)
IG (A)
ID (A)
Sense
Short Circuit Withstand Time (µs)
Drivers

IEEE Power Electronics Magazine - June 2022

Table of Contents for the Digital Edition of IEEE Power Electronics Magazine - June 2022

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