CARESCAPE Monitor B450
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2062973-003
The following sections describe the operation and interaction of the different subsystems.
9.1 Power Supply/ Power management subsystem
9.1.1 AC/DC Power Supply
Power Entry Module
The power entry module consists of an appliance inlet and mains filter. The fuses in the
appliance inlet provide the input protection. AC/DC input cable provides the AC voltage to
AC/DC power supply and protective earth connection to the device chassis.
AC/DC Power Supply Unit
The AC/DC power supply unit is a compact, medical, switched-mode power supply with a
universal AC input. The high-efficiency design minimizes heat dissipation.
The AC input may vary between 90-264 Vac, 47-63 Hz single phase. It is designed to output
15.7 Vdc ± 3% and 65 W continuous output power for the DC/DC board.
The AC/DC power supply unit has overload and overvoltage protections.
AC/DC Output cable
The AC/DC output cable provides the 15.7 Vdc to the DC/DC board.
Batteries
The patient monitor supports two rechargeable and exchangeable (9-12.3V, 3800 mAh)
lithium-ion batteries. They are located in the battery compartment. One battery must be
installed at all times, the second one is optional.
The batteries support Smart Battery Data and they communicate with the DC/DC board using
the System Management Bus (SMBus).
Battery charging and conditioning can take place either inside the patient monitor or with an
external battery charger.
Cooling
The patient monitor uses convection cooling. The ventilation openings of the device are located
in the rear of the patient monitor and below the keypad.
The AC/DC power supply and the CPU assembly have integrated heat sinks to enhance the
cooling of the patient monitor.
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