AN4027 datasheet(17/41 Pages) STMICROELECTRONICS

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AN4027

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

reported in the following figures, 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

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

functionality of the PFC.

In Figure 7 and Figure 8 the input mains current is shown at both nominal mains input

voltages, European and Japanese. At European mains the waveforms show a slightly

higher THD value because, in order to increase the efficiency, the PFC switching frequency

is limited to a value around 125 kHz. However, all harmonics are within the limits specified

by both regulations.

Figure 6. Compliance to EN61000-3-2 at 230 Vac

- 50 Hz, full load

Figure 7. Compliance to JEITA-MITI at 100 Vac -

50 Hz, full load

0.01

0.1

Measured value

EN61000-3-2 Class-D limits

0.0001

0.001

13579 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39

Harmonic Order [n]

AM11399v1

THD: 18.2 % - PF = 0.972

AM11400v1

0.01

0.1

Measured value

JEITA-MITI Class-D limits

0.0001

0.001

13579 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39

Harmonic Order [n]

THD: 7.5 % - PF = 0.933

Figure 8. Mains voltage and current waveforms

at 230 V - 50 Hz - full load

Figure 9. Mains voltage and current waveforms

at 100 V - 50 Hz - full load

CH1:

Mains voltage

CH2:

Mains current

AM11401v1

CH1:

Mains voltage

CH2:

Mains current

AM11402v1

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