Current Sinking Operation
Current Sinking
Regenerative Operation
Keysight MP4362A power modules have a fixed sinking current limit of 0.5 A. Refer
to Output Quadrants for details.
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
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 Keysight MP4361A power module can continuously sink up to 100% of its rated current. This two
quadrant sourcing and sinking capability 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. These controls apply when the MP4361A is operating in Fixed mode.
Current Limit control in voltage priority mode
When operating in voltage priority mode, you can program a negative and positive current limit. This
will limit any current overshoots that may occur during rapid up- or down-programming.
Current setting control in current priority mode
When operating in current priority mode, you can program the output current to seamlessly cross the
zero point when transitioning from positive to negative or negative to positive. Additionally, when
operating in the negative current quadrant, you can program a negative current setting that will hold
the sink current at the specified value. This is useful, for example, for discharging a battery at a
constant current rate.
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 MP4300 Series Operating and Service Guide 85
4 Using the Modular Power System
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