The
series
resonant inverter-fed high-voltage
DC
povller
converter with
a
diode-capacitor multistage voltage multiplier
and
constant on-time
PFM
control scheme discussed
in
this
paper
has
been
proven
to
be
suitable
and applicable
for
a
medical-use
x-ray
power generator
from
a practical
viewpoint. This converter
allows
zero current
soft
switching
to
minimize switching losses
of
the
power
devices
in
spite
of
a
wide
load
variation.
In
addition, the diode-capacitor
multistage
voltage
multiplier
is
introduced
to
largely reduce
the nuniber
of
secondary
turns,
layers,
and
stray
lumped
capacitance
of
the high-voltage transfomier
so
as
to
improve
the efficiency
and
reliability
of
the high-voltage DC-DC
power converter system. Furthermore.
it became possible
to
introduce
low
voltage-rating diodes
to
the
converter system
by
employing
the
multistage diode-capacitor voltage
multiplier topology
for
high-voltage power conversion.
The
control
implementation
of'
optimally-selected
2-step
frequency switching developed for
this series
resonant
PFM
inverter-fed type
DC-DC
power converter acceptable for an
X-ray
power generator
has
been
discussed
herein.
It
was
pointed
out
that
the
proposed control procedure,
by
which
the
desired
output responses
in
transient
state
and
steady-state
could
be
obtained over
a wide range
of
the
output voltage
regardless of
wide
load
regulation range