AMETEK ReFlex - Manual (Page 253)

DC Power Supplies ReFlex Power™
6-50 M380056-01 Rev K
V
Constant-Voltage
Regulation
Constant-Current
Regulation
Set
I
Set
Output
Current
Output
Voltage
R >
V
I
Set
Set
R <
V
I
Set
Set
R =
V
I
Set
Set
Where, R = Load Resistance
= Output Voltage Setting
= Output Current Setting ISet
VSet
Figure 6-18. CV and CC Regulation
C ONSTANT V OLTAGE
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 C URRENT
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.