Ametek Elgar ReFlex Power Operation Manual page 253

DC Power Supplies
V
Set
Output
Voltage
C
ONSTANT
The DC power supply will operate in constant–voltage regulation whenever
the load current is less than the programmed current setting. In this mode,
the power supply maintains the output voltage precisely regulated to the
programmed voltage setting while the load current varies with the load
requirements. This condition is maintained as long as the load current is less
than the current setting. If the load resistance decreases to where the load
current attempts to exceed the current setting, the output current is then
regulated at the programmed current setting, and the output voltage
decreases until that condition is satisfied. This is the automatic crossover
point to constant–current mode of operation.
C
ONSTANT
The DC power supply will operate in constant–current mode whenever the
load resistance times the programmed current setting is less than the
programmed voltage setting. In this mode, the power supply maintains the
output current precisely regulated to the current setting while the load voltage
varies with load requirements. This condition is maintained as long as the
load resistance is less than the voltage setting divided by the current setting.
If the load resistance increases to where the load voltage attempts to exceed
the voltage setting, the output voltage is then regulated to the programmed
voltage setting, and the output current decreases until that condition is
satisfied. This is the automatic crossover point to constant–voltage mode of
operation.
6-50
Constant-Voltage
Regulation
Output
Current
Figure 6-18. CV and CC Regulation
V
OLTAGE
C
URRENT
V
Set
R >
I
Set
R =
Constant-Current
Regulation
Where, R = Load Resistance
V Set = Output Voltage Setting
I
I Set = Output Current Setting
Set
ReFlex Power™
V
Set
I
Set
V
Set
R <
I
Set
M380056-01 Rev L