Test results and significant waveforms

AN3118

10/31

Doc ID 16847 Rev 2

4

Test results and significant waveforms

4.1

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 the relevant regulations.

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

EN61000-3-2 Class-D and Japanese standard JEITA-MITI class-D, at full load and 70 W

output power, at both the nominal input voltage mains. As shown in the following images, 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 lowest

power limit at which the harmonics have to be limited according to the mentioned standards.

Measurements are given in Figure 3 to 6.

Figure 3.

EVL6563H-250W TM PFC

compliance to EN61000-3-2

standard at 250W

Figure 4.

EVL6563H-250W TM PFC

compliance to JEITA-MITI standard

at 250 W

Vin = 230 Vac - 50 Hz, Pout = 250 W, THD = 4.02 %, PF = 0.986

Vin = 100 Vac - 50 Hz, Pout = 250 W, THD = 3.65 %, PF = 0.999

Figure 5.

EVL6563H-250W TM PFC

compliance to EN61000-3-2

standard at 70 W

Figure 6.

EVL6563H-250W TM PFC

compliance to JEITA-MITI standard

at 70 W

Vin = 230 Vac - 50 Hz, Pout = 70 W, THD = 11.94 %, PF = 0.87

Vin = 100 Vac - 50 Hz, Pout = 70 W, THD = 5.46 %, PF = 0.995