AN2782 datasheet(32/39 Pages) STMICROELECTRONICS

32 / 39 page

Test results and significant waveforms

AN2782

32/39

Doc ID 14763 Rev 2

Test results and significant waveforms

One of the main purposes of a PFC preconditioner is the correction of input current

distortion, decreasing the harmonic contents below the limits of the relevant regulations.

Therefore, this demonstration board has been tested according to the European standard

EN61000-3-2 Class-D and Japanese standard JEIDA-MITI Class-D, at full load at both

nominal input voltage mains.

As reported in the following Figure 24, Figure 25, Figure 26 and Figure 27 the circuit is able

to reduce the harmonics well below the limits of both regulations from full load down to light

load. Please note that all measures and waveforms have been done using a common mode

Pi-filter connected at the input (C1, L1, C2, C3) and a differential mode Pi-filter after the

input bridge for filtering the noise coming from the circuit.

Figure 24.

EVL6562A-400W compliance to

EN61000-3-2 standard at full load

Figure 25.

EVL6562A-400W compliance to

JEIDA-MITI standard at full load

0.0001

0.001

0.01

0.1

1 3

5 7

9 11 13 1517 1921 23 25 272931 3335 3739

Harmonic Order (n)

Measurements @ 230Vac Full load

EN61000-3-2 class D limits

0.0001

0.001

0.01

0.1

1 3 5

7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39

Harmonic Order (n)

Measurements @ 100Vac Full load

JEIDA-MITI class D limits

Figure 26.

EVL6562A-400W compliance to

EN61000-3-2 standard at 70 W

Figure 27.

EVL6562A-400W compliance to

JEIDA-MITI standard at 70 W

0.0001

0.001

0.01

0.1

1 3

7 9 1113 15 1719 2123 25 2729 3133 35 3739

Harmonic Order (n)

Measurements @ 230Vac 70W

EN61000-3-2 class D limits

0.0001

0.001

0.01

0.1

3 5

9 1113 15 171921 23 252729 313335 37 39

Harmonic Order (n)

Measurements @ 100Vac 70W

JEIDA-MITI class D limits

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