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4 Using the Regenerative Power System
Priority Mode Tutorial
Voltage Priority
Current Priority
Power Priority
Voltage Priority
In voltage priority mode, the output is controlled by a constant-voltage feedback loop, which
maintains the output voltage at its programmed setting provided the load current remains within the
positive or negative current limit settings. Voltage priority mode is best suited for use with resistive or
high impedance loads, and loads that are sensitive to voltage overshoots. Do not use voltage priority
mode with low-impedance sources such as batteries, power supplies, or large charged capacitors.
In voltage priority mode, the output voltage should be programmed to the desired value. A positive and
negative current limit value should also be set. The current limit should always be set to a value that is
greater than the actual output current requirement of the external load. The following figure shows the
voltage priority operating locus of the output. The area in the white quadrant shows the output as a
source (sourcing power). The shaded quadrant show the output as a load (sinking power).
The heavy solid line illustrates the locus of possible operating points as a function of the output load.
As shown by the horizontal portion of the line, the output voltage remains regulated at its programmed
setting provided the load current remains within the positive or negative current limit setting. A CV
(constant voltage) status indicates that the output voltage is being regulated and the output current is
within its limit settings.
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Keysight RP7970 & RP7980 Series Operating and Service Guide
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