Publicité
Les langues disponibles
Les langues disponibles
4 Using the Photovoltaic Array Simulator
Current Sinking Operation
Current Sinking
Regenerative Operation
Current Sinking
Current sinking, also referred to as down-programming, is the ability to pull current into the positive
terminal of the power supply. For example, the power supply pulls or sinks current into the positive
terminal whenever a lower output voltage is programmed. This is necessary because stored energy
from the power supply's output capacitor and external capacitance from the load, including the wiring,
must be discharged to lower the voltage at the output terminals.
The ability to rapidly transition from a higher to a lower constant voltage level greatly improves the
power supply's output response time. At some point, some of this energy may be returned to the ac
mains by the power supply. This is the most commonly used application of the regenerative function of
the unit, which is automatic and completely transparent to the user.
The power supply can also continuously sink up to 10% of its rated current for an indefinite time. This
two-quadrant
sourcing and sinking capability of the power supply allows for seamless transitions
between sourcing and sinking current without changing the power supply's output characteristics or
introducing any disruptive behavior. The following controls are provided to fully utilize the two-
quadrant output capability of the supply.
Current Limit control in voltage priority mode
When operating in voltage priority mode, you can program a positive
current
limit. This will limit any
current overshoots that may occur during rapid up- or down-programming. The negative current limit
is fixed at 10% of the rated output.
Current setting control in current priority mode
If your application requires precise control of the sourcing current, current
slew controls
are available
to specify a current slew rate when sourcing current.
Regenerative Operation
Regenerative operation is automatic and requires no programming on the part of the user. Whenever
the unit is sinking current, either by rapidly down-programming the output, or by discharging an
energy source such as a battery, the unit will return the excess energy to the ac mains. Refer to
AC
Mains Considerations
for additional information.
Keysight PV8900 Series Operating and Service Guide
115
Publicité
