AN3407

Input current harmonics measurement

Doc ID 018857 Rev 1

11/25

4

Input current harmonics measurement

The internal THD optimizer increases the performance when the mains voltage reaches

zero which reduces crossover distortion and avoids introducing offset. One of the main

purposes of a PFC pre-conditioner is the correction of input current distortion, decreasing

the harmonic contents below the limits of the relevant regulations. The board has been

tested according to the European norm EN61000-3-2 Class-D, at full load and nominal input

voltage mains. Figure 10 and 11 show the measurement results.

Figure 10.

full load

Figure 11.

full load