IEEE Power Electronics Magazine - March 2023 - 34

FIG 10 Motor drive inverters operating from a (possibly shared) dc bus [see Figure 9(a) and (b)]. (a) Voltage-source inverter (VSI)
with LC output filter and thus sinusoidal motor voltages. (b) VSI with a dc-dc boost input stage to achieve boost-buck functionality.
(c) Current-source inverter (CSI) with inherently sinusoidal output voltages and buck-boost functionality (note that the dc-dc buck
stage is needed for voltage-to-current conversion).
FIG 11 (a) Motor drive based on line-commutated inverters (LCI). (b) Realization of the minimum required functionality (bipolar
voltage blocking but only unidirectional current conduction) for ac-ac current-source converters (CSCs) without the drawback of
(b.i) a high-voltage series diode by using (b.ii) MBDSs and, to reduce complexity, (b.iii) advanced self-switching gate drives [23] or
(b.iv) a cascode configuration of a MBDS and a low-voltage Schottky diode (self-reverse-blocking MBDS, SRB-MBDS) [22];
(c) SRB-MBDS-based ac-ac CSC.
Therefore, the full functionality of a dual-gate MBDS
is not strictly needed, but only that of a transistor with
a series diode [see Figure 11(b)]. Advantageously, this
reduces the number of individual gate control signals and
the overall complexity, as the commutation sequences
can be simplified (no four-step commutations necessary,
see below). However, a dedicated series diode needs to
support the full voltage and hence shows high conduction
losses. Instead, the advantageous ohmic conduction
characteristic of the MBDS could be retained by
controlling one of the MBDSs two gates locally to mimic
the diode behavior (synchronous rectification), which
requires a gate drive with corresponding sensing capabilities
[23]. Alternatively, a cascode arrangement of a
34 IEEE POWER ELECTRONICS MAGAZINE z March 2023
MBDS (featuring one normally-on gate) and a low-voltage
Schottky diode can provide the same functionality without
sensing electronics,
i.e.,
it achieves a self-reverseblocking
(SRB) behavior and a quasi-ohmic conduction
characteristic [22]. The resulting ac-ac CSC VSD topology
is shown in Figure 11(c) and features the same number of
gate control signals as its dual, the ac-ac voltage-source
converter (VSC) shown in Figure 12(a), but again benefits
from the lower number of main magnetic components
which are advantageously shared between the two
converter stages. Note that higher performance (i.e., no
conduction loss contribution from a low-voltage Schottky
diode, small as it may be) can be achieved by accepting the
higher complexity resulting from directly using dual-gate

IEEE Power Electronics Magazine - March 2023

Table of Contents for the Digital Edition of IEEE Power Electronics Magazine - March 2023

Contents
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IEEE Power Electronics Magazine - March 2023 - Cover2
IEEE Power Electronics Magazine - March 2023 - Contents
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