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Physio Control LIFEPAK 9 - Page 27

Physio Control LIFEPAK 9
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Capacitor
Charge
Control
Energy
Transfer
O
August
1993
Physio-Control
Description
1
comparing
it
with
the
+2.5V
at
the
noninverting
input.
When
the
threshold
limit
set
on
the
noninverting
input
of
U17A
exceeds
the
SWBATT
voltage
on
the
inverting
input,
it
indicates
a
failing
battery.
The
output
of
U17A
then
functions
as
described
in
the
previous
paragraph.
The
Capacitor
Charge
Control
circuit
controls
the
Energy
Storage
Capacitor
Charger.
It
achieves
and
maintains
a
selected
voltage
on
the
energy
storage
Capacitor
and
reports
the
capacitor
voltage
status
to
the
System
microprocessor.
The
main
circuit
components
consist
of
op
amp
U17B
and
comparators
U8A,
U8B,
and
U8C.
Op
amp
U17B
sets
and
maintains
the
selected
voltage
to
the
energy
storage
capacitor
by
controlling
an
inhibit
signal
to
pin
2
of
U2A.
When
a
selected
voltage
is
achieved,
U17B
shuts
down
U2A
which
disables
the
Energy
Storage
Capacitor
Charger.
To
set
the
gain
for
a
particular
charge
voltage,
digital-to-analog
(D/A)
converter
U18
is
connected
between
the
inverting
input
and
the
output
of
U17B.
The
output
of
the
D/A
converter
is
controlled
by
selection
of
a
12-bit
word
by
the
System
microprocessor.
Resistors
R2
and
R4
function
as
voltage
dividers
for
the
energy
storage
capacitor
output
voltage.
When
this
divided
voltage
is
applied
to
the
noninverting
input
of
U17B,
the
gain
of
U17B
rises
accordingly.
Comparator
U8C
provides
switching
for
the
Energy
Storage
Capacitor
Charger
in
response
to
input
from
U17B.
When
the
output
of
U17B
rises
above
+2.5V,
U8C
switches
low.
This
low
inhibit
signal
switches
the
output
of
U2A
high,
shutting
down
the
Energy
Storage
Capacitor
Charger.
Comparators
evaluate
the
charge
stored
on
the
energy
storage
capacitor
with
respect
to
the
defibrillation
energy
selected.
U8B
detects
values
greater
than
the
minimum
required
for
in-tolerance
energy;
U8A
detects
values
less
than
the
maximum
allowed
for
the
same
energy
setting.
The
outputs
from
U8A
and
U8B
form
the
CHARGE
VALID
signal,
indicating
valid
energy
charge
levels.
This
signal
informs
the
System
microprocessor
about
the
status
of
the
selected
charge
energy.
The
Energy
Transfer
circuit
transfers
the
energy
stored
in
the
energy
storage
capacitor
out
through
the
paddles.
The
main
circuit
components
are
U6,
Q4,
C9,
and
CR4.
When
the
sternum
and
apex
pushbuttons
on
the
paddles
are
pressed,
the
Sternum
Transfer
and
Apex
Transfer
lines
at
J17
produce
the
Transfer
Request
signal
from
the
output
of
U15A
which
is
sent
to
the
System
microprocessor.
If
all
energy
transfer
parameters
are
correct,
the
System
microprocessor
returns
a
Transfer
Enable
signal
through
U11A
and
U14C.
All
Rights
Reserved
1-13

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