44 PWR-01
Basic Features ｜ 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 cur-
rent of 10 A as an example.
A load resistance (RL) 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 (RL > Rc), the power supply operates in CV
mode. When you want to increase the voltage 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 maintain oper-
ations 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/5 Ω = 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.
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