Efficiency measurement

AN3105

8/30

Doc ID 16774 Rev 2

2

Efficiency measurement

efficiency power supplies. The efficiency has been measured at 25%, 50%, 75%, and 100%,

the average efficiency calculated according to the ES-2 standard is 91.56%.

The measured output voltage at different load conditions is reported in Table 1. As seen, the

voltage is very stable over all the output load range.

The measured efficiency is shown on the lefthand side of the graph in Figure 3, while on the

righthand side of Figure 3 the efficiency, at maximum load and at minimum, nominal, and

maximum AC input voltage, is reported.

Figure 3.

EVL130W-SL-EU demonstration board efficiency diagrams

Table 1.

EVL130W-SL-EU demonstration board: overall efficiency vs. load

Load

230 V-50 Hz

Efficiency [%]

25% load

47.59

0.682

32.46

37.14

87.39%

50% load

47.55

1.37

65.14

70.89

91.89%

75% load

47.54

2.00

95.08

102.1

93.12%

100% load

47.54

2.74

130.26

138.8

93.85%

Average efficiency

91.56%