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4 UEC Int’l Mini-Conference No.52
Figure 4: Basic configuration of the proposed
SSCB.
follows: the Basic configuration of the applica-
tion model of solid state circuit breaker in 100V
Figure 2: Comparison of material properties be- microgrid is designed. The basic operation prin-
tween Si, SiC and GaN ciple of solid state circuit breaker is illustrated.
The corresponding circuit was built in LTspice.
The operational power consumption of different
materials is tested, and local independent sim-
ulations and simulations of the complete circuit
are carried out. Design considerations for key
parameters are discussed and given. The simu-
lation results are illustrated and conclusions are
given.
2 Methodology
2.1 Operation principles and topol-
ogy
The GaN SSCB rapidly and autonomously re-
sponds to the sudden onset of short-circuit or
current faults. It presents a low-cost solution
with sufficient response speed to limit fault cur-
rents in dc networks. Basic configuration of the
proposed SSCB depicted in Figure 4.
It consists of seven main subcircuits: cur-
rent sensor, detection circuit, logic control cir-
cuit, fast drivers and load circuit. All elements
are carefully selected to prompt and timely pro-
Figure 3: The upper voltage and current ratings vide the fastest possible response and process-
of some advanced commercial three-terminal
ing speed. The SSCB is installed in series with
controllable power devices
the system. Its straightforward operation allows
disconnecting the load when the fault current is
detected, and the circuit remains OFF until the
fault is removed and the reset button is pressed.
Figure 5 shows the operating voltage and cur-
