AN3339 datasheet(12/44 Pages) STMICROELECTRONICS

12 / 44 page

Harmonic content measurement

AN3339

12/44

Doc ID 18449 Rev 2

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.

Figure 5, 6, 7, and 8 show the test results. As can be seen, the PFC is able to reduce the

harmonics well below the limits of both regulations in all conditions. Total harmonic

distortion (THD) and power factor (PF) values are given below each diagram.

Figure 5.

EN61000-3-2 compliance at 230

Vac - 50 Hz, full load

Figure 6.

JEITA-MITI compliance at 100 Vac -

50 Hz, full load

Vin=230 Vac - 50 Hz, Pin=204 W

THD=4.22 %, PF=0.985

AM08372v1

0.1

Measured Value

EN61000-3-2 Class-D Limits

0.0001

0.001

0.01

0.1

9 1113 151719 212325 272931 33353739

Harmonic Order [n]

Measured Value

EN61000-3-2 Class-D Limits

Vin=100 Vac - 50 Hz, Pin=209 W

THD=3.71 %, PF=0.999

AM08373v1

0.1

Measured Value

JEITA-MITI Class-D Limits

0.0001

0.001

0.01

0.1

9 11131517192123 252729 3133353739

Harmonic Order [n]

Measured Value

JEITA-MITI Class-D Limits

Figure 7.

EN61000-3-2 compliance at 230 Vac

- 50 Hz, 75 W

Figure 8.

JEITA-MITI compliance at 100 Vac -

50 Hz, 75 W

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

THD=7.29 %, PF=0.867

AM08374v1

0.1

Measured Value

EN61000-3-2 Class-D Limits

0.0001

0.001

0.01

0.1

9 1113 151719 212325 272931 33353739

Harmonic Order [n]

Measured Value

EN61000-3-2 Class-D Limits

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

THD=5.72% , PF=0.999

AM08375v1

0.1

Measured Value

JEITA-MITI Class-D Limits

0.0001

0.001

0.01

0.1

9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39

Harmonic Order [n]

Measured Value

JEITA-MITI Class-D Limits

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