Start-Up Behavior - Infineon IKW40N65WR5 Manual

5 kW two-channel interleaved CCM PFC EVAL board
IKW40N65WR5, IDW60C65D1 and 1ED44175 in high frequency PFC application
System performance
1,0000
0,9950
0,9900
0,9850
0,9800
0,9750
0,9700
0,9650
0,9600
0,9550
500 1000
Figure 17 Power factor of EVAL-PFC5KIKWWR5SYS
4.2

Start-up behavior

Following connection to the grid, the auxiliary power supply starts, and the devices are supplied. During the
output capacitor pre-charging phase, as seen in Figure 6, both channels are bypassed by the D20- an ultrafast
high-voltage rectifier, and the inrush current is limited by two NTC resistors. Once output voltage reaches about
230 V , K1 relay turns on and two NTC are shorted, enabling the converter works with high efficiency.
DC
The board is designed to start in both no load condition and full load condition. Figure 18 and Figure 19 show
the converter full-load start-up waveforms at V
Figure 18 Full load start-up at V
User guide
Power factor
1500 2000 2500
Output power (watt)
180VAC 230VAC
=180 V and V
IN AC
Vout=Blue, V =Yellow, I
GE
=180 V
IN AC
26 of 41
3000 3500
264VAC
=264 V respectively.
IN AC
=Red,V =Green
L1 CE
4000 4500 5000
v1.0
2021-03-05