LT-2026
5
EN
2. Description of Normal Operation
An AC line cord (100-240 VAC, 50/60 Hz) or a DC line cord (12
VDC) supplies electrical power to the DV54/DV53 PAP. The
PAP converts the AC input voltage to DC voltage by means
of an internal switch mode power supply and uses the DC
voltage to power the internal electronics of the unit, such as
microcontroller, motor control circuitry, blower, LCD display,
etc. NOTE: The heated humidifi er will not operate when the
PAP uses external DC power.
The PAP produces positive pressure by spinning a reverse-
curved impeller with a brushless DC motor. Room air is drawn
through a fi lter into the blower, pressurized in the blower,
optionally passed through a heated humidifi er chamber, and
then discharged through a 22mm-ID, smooth-bore tube.
Pressure regulation is achieved using measured pressure as
feedback.
The DV54/DV53 PAP senses patient breathing by monitoring
changes in motor current: Breathing produces variations in
airfl ow; the airfl ow variations produce changes to the blower
load and result in variations to the motor current. A pressure
transducer triggers the auto-ON / auto-OFF functionality and
mask-OFF alerts.
