The Sorensen SG Series is designed for exceptional load transient response, low noise and the highest power density in the industry. With a full 15 kW available down to 20VDC output in a 3U package the SG Series leads the industry in power density. The power density is enhanced by a stylish front air intake allowing supplies to be stacked without any required clearance between units.

To achieve the highest level of load regulation, the SG Series has remote sense capabilities. Remote sensing allows the supply to measure the voltage directly across the load. It then uses this value to regulate the power supply output. The result is a regulated voltage at the load that’s independent of any load line drops. SGA Series voltage regulation specifications apply for line drops of up to 10% of full-scale voltage on 40V to 100V models and up to 4% of full-scale voltage on 160V to 600V models.


Line drop voltage regulation test

To test how well the SG Series is able to handle load line drops, we connected an SGA160/63D-0AAA as shown in Figure 1.


figure 1

Figure 1.


We then set the power supply output to 80V with no load and disabled the unit. The voltage setting was not changed for the remainder of the tests. We then performed three series of tests to quantify the regulation response when high load line drop is experienced while utilizing remote sensing at the load.


Test Series #1

While maintaining a constant load line resistance, we varied the user load and measured the difference between the programmed voltage value and the actual voltage measured across the user load.


test 1

Table 1.


Test Series #2

Test #2 is similar to Test #1, but we set the load at 5 Ω and used an unbalanced load line drop by placing a load in just the negative lead and then in just the positive lead with ~ 18V drop in each leg.


figure 2

Table 2.


Test Series #3

Test #3 is similar to Test #2, but we increased the unbalanced load line drop to approximately ~ 36V drop in each leg.


test 3

Table 3.


The SGA power supply performed exceptionally well in all three tests. Even when a load-line drop over 22% of the full-scale voltage (35.48V) was introduced, the power supply remained well within its regulation specification for both voltage and current. Specifically, the limit for the SGA160/63D-0AAA is + 32mv and the maximum regulation disparity was only 8mv. This was the case whether the load line drop was balanced or not and equates to a load regulation of 0.005% of the rated output voltage.


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