Rugged Environment
AC-DC Converters >100 Watt
KP Series
Edition 4/4.99
5/23
MELCHER
The Power Partners.
200
225
250
275
175
0.5
1.5
0
1
2
li [Arms]
Ui [V AC]
04056
0.2
0.4
0.6
0.8
1
0
1
0.7
0.8
0.9
Power Factor
Io/Io nom
Ui = 255 V AC
Ui = 187 V AC
04057
0.6
3
5
7
9
11
13
Harm.
0.6
0.5
0.4
0.3
0.2
0.1
0
I i [mA/W]
0.7
04055
0.8
Fig. 5
Input current versus input voltage at Io nom
Fig. 6
Harmonic currents at the input, IEC/EN 61000-3-2, class D.
Ui = Ui nom, Io = Io nom.
Fig. 4
Power factor versus output power at Ui 255 V AC and
187 V AC.
Static Input current Characteristic
Harmonic Currents
The harmonic distortion is well below the limits specified in
IEC/EN 61000-3-2, class D.
0.1
1.0
t [ms]
50
100
Iinr [A]
0
i = 360 V
i = 264 V
04054
0.5
Input Inrush Current Characteristic
Fig. 3
Theoretical input inrush current versus time at
i = 187 V √2 (264 V) and 255 V √2 (360 V), Rext = 0
Power Factor, Harmonics
Power factor correction is achieved by controlling the input
current waveform synchronously with the input voltage
waveform. The power factor control is active under all oper-
ating conditions.