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2 Theory of Operation
1006-0836-000 02/03
2-13
2.4.5.1 Control Board
Power Circuits
The power section of the controller board receives the 6 VDC and the 9 VDC
outputs from the power supply.
The 9 VDC supply is used to charge the backup battery.
The 6 VDC supply is processed further to supply various power requirement
throughout the 7100 ventilator. In case of power failure, the battery is
switched in to supply power.
•
power to drive the fan (5V)
•
5V supply for digital circuits
•
3.3V supply for the CPU
•
5V supply for the LCD display backlight
•
-24V adjustable supply for the LCD display contrast adjustment
•
1.5A supply for control of the Inspiratory and PEEP valves
•
+12V supply for analog circuits
•
+12V supply for the Monitoring Interface Assembly
•
-12V supply for analog circuits
Figure 2-9 • Control board block diagram - Power circuits
SUPPLY MONITOR & SELECTION
P-CH MOSFET SWITCHES
ON / STBY SWITCH
VOLTAGE MONITOR
OUTPUT TO A/D
CURRENT MONITOR
OUTPUT TO A/D
5V (FAN 200mA MAX)
5V +-4% 1.7A MAX (DIGITAL)
3.3V +-4% @ 0.2A MAX (CPU)
5V @ 700mA
(BACK LIGHT SUPPLY)
(LCD CONTRAST ADJUST)
-24V ADJUSTABLE
+12V @ 100mA (ANALOG)
1.5A (FLOW & INLET VALVES)
85 --- 264 VAC SWITCHER
APPROVALS:
IEC 601-1
UL - 2601
CSA 601 - 1
ON / STANDBY SWITCH CIRCUIT
6V BATTERY
BATTERY CHARGER
UC3906
VOLTAGE & CURRENT
MONITOR
5V LDO (MIC29150-5.0BU)
5V LDO (MIC29150-5.0BT)
3.3V LDO
PTC
PI FLTR
MAX686
PTC
LDO / 10VA
LDO
LDO / 10VA
+12V @ 150mA
(MONITOR BOARD)
-12V @ 50mA (ANALOG)
NATIONAL
LM2585
SWITCHER
9.0 V @ 500mA MAX
+13V
-13V
VBUS
6.2 ~ 5.3V
6.0V @ 5A MAX
AC
Input
BUZZER
VSWITCH
AAAA
BBBB
....4444
3333
....0000
9999
2222
Содержание 7100
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