AN2994 datasheet(8/38 Pages) STMICROELECTRONICS

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Test results and significant waveforms

AN2994

8/38

Doc ID 15796 Rev 2

Test results and significant waveforms

2.1

Harmonic content measurement

One of the main purposes of a PFC pre-conditioner is to correct the input current distortion,

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

board has been tested according to the European rule EN61000-3-2 Class-D and Japanese

rule JEITA-MITI Class-D, at full load and 70 W output power, at both the nominal input

voltage mains.

As shown in the following figures, the circuit can reduce the harmonics well below the limits

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

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

according the mentioned rules.

Figure 3.

EVL6563S-400W compliance to

EN61000-3-2 Standard at full load

Figure 4.

EVL6563S-400W compliance to

JEITA-MITI Standard at full load

0.0001

0.001

0.01

0. 1

1 3 5 7 9 111315 17 19 2123 2527 293133 35 37 39

Harmon ic Or der [n]

Measured value

EN61000-3-2 Class-D limi ts

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

Harmoni c Ord er [n]

Measur ed value

JEIT A-MI TI limits

Figure 5.

EVL6563S-400W compliance to

EN61000-3-2 Standard at 70 W load

Figure 6.

EVL6563S-400W compliance to

JEITA-MITI Standard at 70 W load

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]

Measured value

EN61000-3-2 Class-D limi ts

0.0001

0.001

0.01

0.1

1 3579 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39

H armo nic O rder [n]

Measured value

JEITA-MITI limits

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