Chapter 3: Theory of Operation
1049766 Rev A
V60 Ventilator Service Manual
3-7
3.2.1
Power management (PM) PCBA
•
Battery charging and management circuitry
•
Internal supply voltages (supply voltages: 3.3 V, 5 V, 12 V, 35 V).
•
Fan power and tach monitoring.
•
Backup alarm control circuitry, including power fail detection.
•
Power switch control circuitry.
•
System alarm and reset management.
•
Electrical interfaces between the CPU PCBA, LCD, and the user
interface (UI) PCBA.
•
Includes an EEPROM for calibration data, board identification
information, and PM PCBA power-on hours.
3.2.2
Power Supply
•
Provides ventilator and battery recharging power from AC line voltage.
•
Converts AC line voltage (100 to 240 VAC, 50 to 60 Hz) into 24 VDC
power.
•
Includes input over-current, output over-voltage, and output current-
limiting protection.
3.2.3
Internal Battery
•
14.4-V, 11.5-Ah lithium-ion battery has a run-time of at least six
hours under normal conditions.
•
Provides operating power when AC power is not available.
•
Provides charge and temperature status to the PM PCBA.
•
Internal circuitry monitors battery status, provides self-contained
fault control features, and communicates this information to the PM
PCBA.
PM PCBA
Power supply
Internal battery