IEEE Electrification - June 2021 - 15

phase. Each capacitor is placed physically close to its
phase to reduce the parasitic loop inductance between
the switch and the capacitor. Each phase handles only
1/N of the total power, which, as a result, significantly
reduces the stress on the switching devices.
Figure 10 shows a 180-kW nonisolated dc-dc converter
developed at Wayne State University (WSU), sponsored by
Weichai Power. The converter adopts interleaved eightphase
soft-switching boost topology (discussed in the following
section) for efficiency improvement and EMI
reduction. The converter reaches more than 98% efficiency
with SiC devices.
Soft-Switching Boost Converters
When a switch is turned on or off under hard switching,
an overlapping area between the current and voltage of
the switch results in a switching power loss, as shown in
Figure 11(a). Soft-switching refers to having a switch
turned on or off when the voltage is zero (ZVS), or the current
is zero [zero-current switching (ZCS)], as shown in
Figure 11(b). The benefits of soft-switching techniques
include reduced switching loss, improved efficiency, and
reduced EMI and heat generation. Up to now, many softswitching
techniques for dc-dc power converters have
been reported in the literature. Resonant circuits and auxiliary
circuits with passive or active snubbers are commonly
used in dc-dc converters to achieve soft switching.
In Figure 12(a), a resonant switching cell including an
inductor, capacitor, and a switch is used to substitute the
normal switch in a regular nonisolated dc-dc converter. In
passive snubber-based nonisolated dc-dc converters,
small inductors and capacitors are used to turn on/off the
T1
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R +
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+
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T4
Cr
(d)
Figure 6. Isolated dc-dc converters: (a) DAB, (b) resonant DAB, (c) unidirectional LLC, and (d) bidirectional CLLC.
T1
C1
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Lr1
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T8
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+
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(b)
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Cc
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1:n
Co
S7
R +
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+
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C2
(d)
Figure 7. Isolated bidirectional dc-dc converters based on: (a) full-bridge, (b) L-type full-bridge, (c) push-pull, and (d) L-type half-bridge.
IEEE Electrification Magazine / JUNE 2021
15
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L1
L2
S3
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S7
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+
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Vo

IEEE Electrification - June 2021

Table of Contents for the Digital Edition of IEEE Electrification - June 2021

Contents
IEEE Electrification - June 2021 - Cover1
IEEE Electrification - June 2021 - Cover2
IEEE Electrification - June 2021 - Contents
IEEE Electrification - June 2021 - 2
IEEE Electrification - June 2021 - 3
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