A pressure transducer at the exhalation valve provides feedback
that tells the exhalation solenoid to increase or decrease its output
to achieve the correct drive pressure. The exhalation solenoid
associates an approximate PEEP with an approximate drive
pressure. In case of a circuit disconnect, these reference
pressures help avoid supplying excess pressure in the circuit after
reconnection. Excess flow from the jet pump vents through the
muffler.
Electronics
Power to the ventilator enters the A.C. inlet, which connects to the
power supply. The power supply converts alternating current to
direct current, and accepts any voltage or frequency within the
specified range.
Direct current from the power supply enters the DC-DC PCB,
which supplies operating voltage to other PCBs, includes circuitry
for external battery connection and battery operation, and powers
the fan, and heater.
The Main PCB accepts input from the oxygen sensor and servo
valves, acts as “motherboard” for the ventilator including the
secondary (Backup) alarm. The Main PCB powers and receives
signals from the Analog PCB.
The Analog PCB accepts signals from the flow sensors and
includes all ventilator transducers. The Solenoid PCB includes all
valve controls (solenoids) except for the exhalation valve solenoid
attached to the jet pump.
The Single Board Computer Board includes all of the video
interface, USB, RS232, Primary Audio Alarm, and Touch Screen
interfaces.
SER360 A1106 A-11
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