Publicité
Les langues disponibles
Les langues disponibles
4 Using the Photovoltaic Array Simulator
Priority Mode Tutorial
Voltage Priority
Current 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 as long as 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
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 quadrants shows the output as a source
(sourcing power). The shaded quadrants 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 as long as the load current remains within the positive 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.
Note that when the output current reaches the positive current limit, the unit no longer operates in
constant voltage mode and the output voltage is no longer held constant. Instead, the power supply
will now regulate the output current at its current limit setting. A LIM+ (positive current limit) status is
set to indicate that a current limit has been reached. These conditions are annunciated by CL+ on the
front panel.
Keysight PV8900 Series Operating and Service Guide
159
Publicité
