switches
Q1 and
Q4
are
on
while
the
Q2
and
Q3
are
off.
When
control signal
B
is a high
state,
the active
power
switches
Q2
and Q3 are
on
while
the Q1 and
Q4
are
OK
When
neither
of
the signals
is
a
high
state,
the
Ql-Q4
are
all
off.
As
seen
in this
Fig.7,
the
inverter
operates
at the
maximum
switching
frequency
(fsta,
26kHz
in
this
case
)
until
the
output voltage
reaches
about
90%
of
the
target
voltage VI.
At
this point,
the switching frequency
is
to
be
switched
to
the
switching
.frequency
(frcf)
that is
proportional
to
the desired
target
voltage. Observing the wavefomis
illustrated
in
Fig.7,
it is clearly
understood
that
the
desired
output responses
being
of
short
rise
times
and no-overshoot
can
be
achieved
by
the
proposed
2-step
selected frequency control scheme
switches Q1 and Q4 are on while the Q2 and Q3 are off. When control signal B is a high state, the active power switches Q2 and Q3 are on while the Q1 and Q4 are OK When neither of the signals is a high state, the Ql-Q4 are all off. As seen in this Fig.7, the inverter operates at the maximum switching frequency (fsta, 26kHz in this case ) until the output voltage reaches about 90% of the target voltage VI. At this point, the switching frequency is to be switched to the switching .frequency (frcf) that is proportional to the desired target voltage. Observing the wavefomis illustrated in Fig.7, it is clearly understood that the desired output responses being of short rise times and no-overshoot can be achieved by the proposed 2-step selected frequency control scheme
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