GE HEALTHCARE CARESCAPE Monitor B450, Техническое руководство

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CARESCAPE Monitor B450
120
2062973-003
9.2.1 PUIC controller and software
The Power Management and User Interface Controller (PUIC) software controls the hardware
related functions of the DC/DC and user interface controller subsystems.
The PUIC software is included in the host software package and upgradeable via software CD.
9.2.2 DC/DC Subsystem
The DC/DC subsystem takes care of:
•
the power path control and sequencing,
• DC/DC conversions,
• smart battery management
• system supervision
Power path control and sequencing
The DC/DC subsystem takes care of controlling the power path switches. The power path
switches select either AC/DC output voltage or battery voltage as the DC/DC board input
source. The PUIC controller controls power supplies' sequencing.
DC/DC conversions
The DC/DC board converts the output voltage of the AC/DC power supply, or the battery
voltage, to the following supply voltages:
•
+12V is generated by using buck-boost converter. It is supplied to the CPU module,
thermal recorder and the LED backlight converter unit in the LCD display.
• +15V is generated by using a buck-boost converter. It is supplied to the E-modules and
PSM module t15VMOD circuit breaker.
• VSYS voltage level depends on the selected power source. In battery use, the VSYS is
between 8.7-12.3V and in AC/DC use the VSYS is between 14.9-16.1V. The VSYS voltage s
supplied to the PDM module and to the voltage converter in the CPU Carrier Board.
All supply voltages have over-voltage and short-circuit protection.
Smart Battery Management
The PUIC controller acts as a SMBus host device and takes care of the battery management
and charging.
The smart battery charger acts as a SMBus slave device that responds to charging current and
charging voltage requests received via SMBus.
The PUIC controller may reduce or stop charging current if needed from the system point of
view, for example, if the system power consumption or temperature would get too high. The
smart battery is responsible for the charging algorithm and capacity calculation.
System supervision
The PUIC controller monitors the internal supply voltages, temperatures and power
consumption of the patient monitor.
The voltages and temperatures are measured by the A/D converters and temperature sensors
in the DC/DC board and CPU Carrier Board. System current is measured from the DC/DC board
and used to calculate the system power consumption.
The communication between the PUIC controller and the A/D converter and temperature
sensor on CPU Carrier board takes place via the I2C bus (Inter-Integrated Circuit).