AN2761 datasheet(29/36 Pages) STMICROELECTRONICS

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AN2761

Test results and significant waveforms

Doc ID 14690 Rev 2

29/36

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 shown in the following Figure 19 and 20, 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 Pi-filter for filtering the noise coming from

the circuit, using a 25 mH common mode choke and two 220NF-X2 filter capacitors.

Figure 19.

EVL6562A-TM-80W compliance to

EN61000-3-2 standard

Figure 20.

EVL6562A-TM-80W compliance to

JEIDA-MITI standard

0.0001

0.001

0.01

0.1

9 1113 1517 1921 2325 2729 31333537 39

Harmonic Order (n)

Measurements @ 230Vac Full load

EN61000-3-2 class D limits

Vin = 230 Vac - 50 Hz, Pout = 80 W

THD = 10.48 %, PF = 0.973

0.0001

0.001

0.01

0.1

9 1113 1517 19 21 2325 27 293133 35 37 39

Harmonic Orde r (n)

Measurements @ 100Vac Full load

JEIDA-MITI class D limits

Vin = 100 Vac - 50 Hz, Pout = 80 W

THD = 3.18 %, PF = 0.997

AN2761 Datasheet(PDF) 29 Page - STMicroelectronics