AN2485

Test results and significant waveforms

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Test results and significant waveforms

2.1

Harmonic content measurement

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 European and Janapese

regulations. The board has been tested according to European norm EN61000-3-2 Class-D

and Japanese norm JEIDA-MITI Class-D, at full load and 70 W output power, at both the

nominal input voltage mains.

As shown in Figure 2, 3, 4, and 5, the circuit is able to reduce the harmonics well below the

limits of both regulations from full load down to light load. 70 W of output power has been

chosen because it is almost the lower power limit at which the harmonics must be limited

according to these international norms.

For user reference, waveforms of the input current and voltage at the nominal input voltage

mains and different load conditions are given in Figure 6, 7, 8, 9, 10, and 11.

Figure 2.

EVAL6563-400W compliance to

EN61000-3-2 at 230 Vac-full load

Figure 3.

EVAL6563-400W compliance to

JEIDA-MITI at 100 Vac-full load

0.001

0.01

0.1

1

10

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39

Harmonic Order [n]

Measured value

EN61000-3-2 Class-D limits

0.001

0.01

0.1

1

10

1 3 5 7 9 1113 1517 1921 2325 2729 3133 3537 39

Harmonic Order [n]

Measured value

JEIDA-MITI Class-D limits

Figure 4.

EVAL6563-400W compliance to

EN61000-3-2 at 230 Vac-70 W load

Figure 5.

EVAL6563-400W compliance to

JEIDA-MITI at 100 Vac-70 W load

0.001

0.01

0.1

1

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39

Harmonic Order [n]

Measured value

EN61000-3-2 Class-D limits

0.001

0.01

0.1

1

1 3 5 7 9 1113 1517 1921 2325 2729 3133 3537 39

Harmonic Order [n]

Measured value

JEIDA-MITI Class-D limits