Power Supply Function
In CV 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 input current
requirement of the external load. The following figure shows the CV priority op-
erating locus of the output. The area in the white quadrants shows the output as
a source (sourcing power). The area in the shaded quadrants shows the output
as a load (sinking power).
In sink mode, there is a minimum operating voltage. For this series models,
the MOV corresponding to –Imax is about Vmax*2%.
The heavy solid line illustrates the locus of possible operating points as a func-
tion of output. 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 or negative current limit setting. A CV status flag indicates
that the output voltage is being regulated and the output current is within its limit
settings.
Note that when the output current reaches either the positive or negative current
limit, the unit no longer operates in constant voltage mode and the output volt-
age is no longer held constant. Instead, the unit will now regulate the output cur-
rent at its current limit setting.
As shown by the vertical portions of the shaded quadrants, the output voltage
may continue to increase in the positive direction or decrease in the negative di-
rection as current is forced into or pulled out of the unit. When the output voltage
exceeds the over-voltage protection setting, the output will shut down.
Copyright © Itech Electronic Co., Ltd.
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