Kikusui PBZ20-20, User Manual

Page: 37 / 170

PBZ
37
Operation Modes
2
Ba
sic Featu
res
In these situations, if you set the PBZ to unipolar mode, you can greatly reduce the output
amplifier’s internal loss. As a result, the PBZ’s operating range in the second quadrant will be
expanded to its rated values.
Example of a battery load
The PBZ is in unipolar mode in the figure below. Using a battery load as an example, let’s
consider the output amplifier’s internal loss.
In what direction is the load current (the battery’s discharge current) flowing? The load current
does not flow in the positive side’s internal power supply. All the load current flows in the
negative side’s internal power supply. The output amplifier’s negative side requires very little
of the internal power supply’s voltage, but because a large current flows, the internal loss is
great.
If we set the PBZ to unipolar mode, we can make the voltage of the output amplifier’s
negative side internal power supply nearly zero. Therefore, even if a large current flows, we
can greatly reduce the internal loss. As a result, the PBZ’s operating range in the second
quadrant will be expanded to its rated values.
Operations in the third and fourth quadrants
p. 27
In unipolar mode, the PBZ normally operates in the first and second quadrants (two-quadrant
operation). The voltage is generated with a single polarity. The OUTPUT OUT terminal is
positive, and the COM terminal is negative. Hence, to make the PBZ operate in the third and
fourth quadrants, you must reverse the wiring that connects the OUTPUT OUT terminal and
COM terminal to the load so that the voltage polarity is reversed.
CV/CC Mode
●
Select CV mode when you want the PBZ to operate as a constant voltage source.
Even if the load current changes, the PBZ generates the specified signal source voltage.
●
Select CC mode when you want the PBZ to operate as a constant current source.
Even if the load voltage changes, the PBZ generates the specified signal source current.
The PBZ does not change automatically from CV mode to CC mode. When output is on, you
cannot switch between CV and CC modes.
p. 86
Use to select the CV/CC mode setting.
CV mode
Positive side's internal power supply
Negative side's internal power supply
Vout
Iout
See
See
CONFIG