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LIFEPAK 20/20e Defibrillator/Monitor Device Description
Functional Description (continued)
A07 Battery
(continued)
On the LIFEPAK 20e defibrillator/monitor, the Li-ion battery technology was
selected for the same reasons as NiMH, but they are even lighter in weight.
Li-ion batteries require a constant current-constant voltage charger that is
provided by the A03 Power Module when the device is connected to ac power.
A08 Backlight Inverter
PCB
The A08 Backlight Inverter provides power to the internal fluorescent backlight
in the A11 Active Display. Filtered SW_VBatt is provided to the A08 Backlight
Inverter through the A05 User Interface PCB. The output of the inverter is
1000 to 1500 RMS, open-circuit power to the internal A11 Active Display
backlight. The 3308907 backlight driver for the LED A11 Display has an output
average output voltage of 22Vdc and current of 24 mA dc
A09 AC Power Supply
Module
The A09 AC Power Supply Module is a 60-Watt OEM power supply, designed
to meet IEC 60601-1 standards, converting 120/240 Vac (60/50 Hz) input signals
to nominal 12 Vdc. The ac power supply provides power to the A03 Power
Module for routing to the other PCBs in the device. The 12 Vdc output from the
ac power supply is directly diode ORed into the SW_VBatt (switched battery
voltage) to power on the A04 Therapy PCB. The A03 Power Module sits above
the ac power supply and plugs directly into the ac power supply’s power
connector. Both the A03 Power Module and the ac power supply are held
mechanically in place by the power assembly bracket.
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