PMX_MULTI
User’s Manual
35
Basic Functions | CV Power Supply and CC Power Supply
CV mode and CC mode operation example
This section uses a power supply with a rated output voltage of 100 V and a rated output current of 10 A as
an example.
A load resistance (R
L
) of 8 Ω is connected to the output terminals of the power supply. The output voltage
and output current are set to 30 V and 5 A, respectively. In this case, Rc = 30 V/5 A = 6 Ω. Because 8 Ω is
greater than 6 Ω (R
L
> Rc), the power supply operates in CV mode. When you want to increase the volt-
age in CV mode, you can increase the voltage up to the voltage defined by the following equation: Vs = Is
× R
L
. Substituting the values, we obtain Vs = 5 A × 8 Ω = 40 V. If you try to increase the voltage above this
point, the crossover point is reached, and the power supply automatically switches to CC mode. To main-
tain operations in CV mode, increase the current limit.
Next, a load resistance (RL) of 5 Ω is connected to the output terminals of the power supply. The output
voltage and output current are set to 30 V and 5 A, respectively. In this case, Rc = 30 V/5 A = 6 Ω.
Because 5 Ω is less than 6 Ω (RL < Rc), the power supply operates in CC mode. If you want to increase
the current in CC mode, you can increase the current up to the current defined by the following equation:
Is = Vs/R
L
. Substituting the values, we obtain Is = 30 V/5Ω = 6 A. If you try to increase the current above
this point, the crossover point is reached, and the power supply automatically switches to CV mode. To
maintain operations in CC mode, increase the voltage limit.
