12 DC Power Supply and Power Control Circuit
12-8 FLO-GARD 6301 DUAL CHANNEL VOLUMETRIC INFUSION PUMP SERVICE MANUAL 07-19-B1-729
DC Power Supply and Power Control Circuit
See Figure 13-5 through Figure 13-8. The DC power supply circuit is a
switching type, which provides a regulated 13.65 V output at 1.4A maximum.
The circuit charges the battery as long as the pump is connected to a specified
AC outlet. The design continues to supply useful output down to a 105.0 VAC
input. Two 500 mA slow blow replacement fuses are required for AC. A 2.0A
fuse is required in the battery circuit. Whenever the supply is activated by AC
voltage, the Plug Icon on the front panel is lit. The DC power supply has
over-voltage and over-current protection.
The power supply circuit on the CPU board (Figure 13-8) generates several
DC sources from the 13.65 V output of the DC power supply board, (when
the pump is plugged into a specified AC source) or from the internal battery.
The +5 VDC lines are shown below. See “DC Line Voltage Calibration” on
page 9-1 for voltage specification limits.
Q Vcpu: This line is the output of a DC to DC convertor, HIC301, and is
switched by the master CPU. Vcpu is the main DC source voltage of
the pump. Motor current does not flow while Vcpu is off.
Q Vref: This is the reference voltage regulated by a filter and a
reference diode (U502: LM336M-5.0 in Figure 13-7) for the A/D
convertor in the UPP. This voltage is generated from Voth, which is
switched by the master CPU.
Q Vkey: This is generated either from the output of the DC power
supply board, or from the internal battery voltage and is used for
monitoring the
ON-OFF/CHARGE key. This is the unswitched power
source.
Other DC voltages used in the pump are as follows:
Q Vmtr: This is the DC source for the motor. It comes either from the
DC power supply output or the internal battery voltage. This is the
unswitched power source.
Q Voth: This is used for backlights, icons and optional nurse call
feature. The voltage comes from the DC power supply output and is
switched by the master CPU.
Q Vmem: This is the output of the lithium backup battery for the
backup memory in the RAM (U507) and for maintaining the time in
real time clock (U506). This is the unswitched power source.
All the voltages except unswitched power sources are turned on when the
ON-OFF/CHARGE key is pressed while the pump is off. However, turning
these voltages off can only be accomplished by the master CPU through the
power control circuit.
The master CPU saves necessary data in the back up memory in the RAM
(U507) and turns off the Vcpu, Vref and Voth voltages when both pumps are
turned off.
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