AN3233
Harmonic content measurement
3
Harmonic content measurement
The board has been tested according to the European standard EN61000-3-2 Class-D and
the Japanese standard JEITA-MITI Class-D, at both the nominal input voltage mains. As
shown in the following images, the circuit is able to reduce the harmonics well below the
limits of both regulations.
Figure 5. Compliance with EN61000-3-2 at 230 Vac – 50 Hz, full load
Measured Value
EN610003 2 ClassD Limits
1
0.1
0.01
0.001
0.0001
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39
Harmonic Order [n]
THD = 14.70 % - PF = 0.978
Figure 6. Compliance with JEITA-MITI at 100 Vac – 50 Hz, full load
Measured Value
JEITAMITI Class D Limits
1
0.1
0.01
0.001
0.0001
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39
Harmonic Order [n]
THD = 5.20 % - PF = 0.995
On the bottom side of the diagrams the total harmonic distortion (THD) and power factor
(PF) have been measured too. The values in all conditions give a clear idea regarding the
correct functioning of the PFC.
Doc ID 17595 Rev 1
13/35