LIFEPAK 20/20e Defibrillator/Monitor
Device Description
Functional Description
(continued)
A03 Power Module
(continued)
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Battery Charger
(LIFEPAK 20e defibrillator/monitor) — The battery charger
is a constant current-constant voltage charger designed specifically to
support the A07 Lithium Ion Battery selected for the device. Li-ion batteries
are not designed for trickle charging, so the A09 AC Power Supply Module
keeps track of the Li-ion battery's state-of-charge and, when it drops below
85%, the battery charger initiates charging of the battery (provided the
temperature is between 0° and 50° C). Charging can occur while the device
is powered on or while the device is powered off, depending on need. The
battery charger is designed to typically charge the internal battery in less
than four hours when the device is powered off and AC power is applied.
■
Sonalert
— The sonalert is an audio tone generator located on the power
module that warns the user if the device is turned off while not connected to
ac power (which depletes the internal A07 Battery). This
can be turned off. A shipping mode setup is provided to temporarily disable
this feature when packing the device for shipment.
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RS-232 Drivers
—
The RS-232 signal originates on the A01 System Control
PCB. The RS-232 drivers shift the signal levels to ±12 V prior to the system
connector output.
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