AN3329 datasheet(11/47 Pages) STMICROELECTRONICS

11 / 47 page

AN3329

Harmonic content measurement

Doc ID 18376 Rev 1

11/47

Harmonic content measurement

The main purpose of a PFC pre-regulator is the input current shaping to reduce the

harmonic content below the limits of the relevant regulations. This demonstration board has

been tested according to the European standard EN61000-3-2 Class-D and Japanese

standard JEITA-MITI Class-D, at full load and 75 W input power, at both the nominal input

voltage mains. Figure 7 to Figure 10 show the test results. Note that the PFC stage operates

properly as it effectively reduces harmonics well below the limits of both regulations in all

conditions. Total harmonic distortion and power factor values are reported below in each

diagram.

Figure 7.

EN61000-3-2 compliance at 230 Vac

- 50 Hz, full load

Figure 8.

JEITA-MITI compliance at

100 Vac - 50 Hz, full load

Vin=230 Vac - 50 Hz, Pin=191 W

THD=4.52 %, PF=0.982

Vin=100 Vac - 50 Hz, Pin=191 W

THD=3.97 %, PF=0.999

Figure 9.

EN61000-3-2 compliance at

230 Vac - 50 Hz, 75 W

Figure 10.

JEITA-MITI compliance at

100 Vac - 50 Hz, 75 W

Vin=230 Vac - 50 Hz, Pin=75 W

THD=7.15 %, PF=0.867

Vin=100 Vac - 50 Hz, Pin=75 W

THD=5.66 %, PF=0.999

AN3329 データシート(PDF) 11 Page - STMicroelectronics