AN3172

Harmonic content measurement

Doc ID 17230 Rev 1

13/31

3

Harmonic content measurement

The board has been tested according to the European standard EN61000-3-2 Class-D and

Japanese standard JEITA-MITI Class-D, at both the nominal input voltage mains. As shown

in Figure 5 and 6, the circuit is able to reduce the harmonics well below the limits of both

regulations.

On the bottom side of the diagrams the total harmonic distortion and power factor have also

been measured. The values in all conditions give a clear idea about the correct functioning

of the PFC.

Figure 5.

Compliance to EN61000-3-2 at 230

Vac - 50 Hz, full load

Figure 6.

Compliance to JEITA-MITI at 100

Vac - 50 Hz, full load

THD = 5.13 % - PF = 0.965

THD = 3.89 % - PF = 0.996