Fairchild FEBFAN9611 S01U300A, User Manual

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© 2012 Fairchild Semiconductor Corporation 32 FEBFAN9611_S01U300A • Rev. 0.0.1
10.8. Harmonic Distortion and Power Factor
Figure 47 and Figure 48 compare the measured harmonic current with EN61000 Class D
and Class C, respectively, at input voltages of 115V
AC
and 230V
AC
. Class D is applied to
TV and PC power, while Class C is applied to lighting applications. As can be observed,
both regulations are met with sufficient margin.
Figure 47. Harmonic Current, 115V
AC
Figure 48. Harmonic Current, 230V
AC
Figure 49. Measured Power Factor Figure 50. Measured Total Harmonic Distortion
Figure 49 shows the measured power factor at input voltage of 115V
AC
and 230V
AC
. As
observed, high power factor above 0.95 is obtained from 100% to 50% load. Figure 50
shows the total harmonic distortion at input voltages of 115V
AC
and 230V
AC
.
0
0.2
0.4
0.6
0.8
1
1.2
3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39
Ha
rm
o
n
ic
C
u
rre
n
t
(A
)
Harmonic Number
EN61000 ‐ 3 ‐ 2, 115V
AC
, 300W
Measured Harmonic Current
Class C Limit
Class D Limit
0
0.2
0.4
0.6
0.8
1
1.2
3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39
Ha
rm
o
n
ic
C
u
rre
n
t
(A
)
Harmonic Number
EN61000 ‐ 3 ‐ 2, 230V
AC
, 300W
Measured Harmonic Current
Class C Limit
Class D Limit
0.70
0.75
0.80
0.85
0.90
0.95
1.00
0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
Po
w
e
r
Fa
ct
o
r
Output Power (%)
Power Factor vs. Load
(400V
DC
Output, 300W)
230Vac
115Vac
0%
5%
10%
15%
20%
25%
30%
0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
TH
D
(%
)
Output Power (%)
Total Harmonic Distortion vs. Load
(400V
DC
Output, 300W)
230Vac
115Vac