2-4 Before Using the Unit PAS SERIES
2.3 CV Power Supply and CC Power Supply
This unit is capable of both constant voltage and constant current
operation. This section describes these operations.
An ideal constant voltage power supply has zero output impedance at
all
frequen
cies and maintains a constant voltage against all types of
load current variations. An ideal constant current power supply has
infinite output impedance at all frequencies and maintains constant
current by absorbing the load resistance variations by changing the
voltage.
However, the output impedance of an actual constant voltage or con-
stant
current po
wer supply is neither zero nor infinite and has a fre-
quency response. In addition, since the output has limitations in terms
of maximum voltage and maximum current, power supplies are
unable to maintain a constant voltage or current for all types of load
current variations and load resistance variations. The following
describes the relationship between the basic operations in constant
voltage (CV) and constant current (CC) modes and the limit setting of
the unit.
The following description assumes a power supply with a DC output
of 100 V and 10 A (maximum rated output voltage of 100 V and max-
imum rated output current of 10A) as an example.
A resistive load of 10 Ω is connected to the output terminals of the
power supply, and the output current limit is set to 5 A. In this condi-
tion, the output voltage is raised gradually from 0 V. At this point, the
power supply is operating in the constant voltage (CV) mode. The
Fig.2-5
Ideal constant voltage power
supply
Fig.2-6
Ideal constant current
power supply
Output current Io Output current Io
0
0
Constant
Constant
Output voltage Eo
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