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| 型号： | LK4003-9ERD9 |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 150 W AC-DC PWR FACTOR CORR MODULE |
| 封装： | HEAT SINK, METAL, CASE K02, MODULE |
| 文件页数： | 14/28页 |
| 文件大小： | 606K |
| 代理商： | LK4003-9ERD9 |
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Cassette Style
150 Watt AC-DC Converters
K Series PFC
Edition 01/01.2001
21/28
Leakage Currents in AC-DC operation
Leakage currents flow due to internal leakage capacitance
and RFI suppression Y-capacitors. The current values are
proportional to the mains voltage and nearly proportional to
the mains frequency and are specified at an input voltage of
254 V (50 Hz) where phase, neutral and protective earth
are correctly connected as required for class I equipment.
V
MI
500
1500
10 k
220 nF
22 nF
10061
Under test conditions the leakage current flows through a
measuring instrument (MI) as described in fig.:
Measuring
instrument for earth leakage current tests, which takes into
account impedance and sensitivity of a person touching
unearthed accessible parts. The current value is calculated
by dividing the measured voltage by 500
. If inputs of K-
units are connected in parallel, their individual leakage cur-
rents are added.
Fig. 28
Measuring instrument (MI) for earth leaking current tests
according to IEC/EN 60950.
Vo+
Vo–
N
P
10062
N
P
MI for
earth
leakage
current
Fig. 29
Test set-up
Table 14: Leakage currents
Characteristic
Class I
Unit
LK 4000, LK 5000
Maximum earth
Permissible according to IEC/EN 60950
3.5
mA
leakage current
Specified value at 254 V, 50 Hz
0.82
Safety of operator accessible output circuit
If the output circuit of an AC-DC converter is operator ac-
cessible, it shall be an SELV circuit according to the IEC/EN
60950 related safety standards.
The following table shows a possible installation configura-
tion, compliance with which causes the output circuit of an
K series AC-DC converter to be an SELV circuit according
to IEC/EN 60950 up to a configured output voltage (sum of
nominal voltages if in series or +/– configuration) of 36 V.
However, it is the sole responsibility of the installer to as-
sure the compliance with the relevant and applicable safety
regulations. More information is given in:
Technical Infor-
mation: Safety.
Table 15: Safety concept leading to an SELV output circuit
Conditions
AC-DC converter
Installation
Result
Nominal voltage
Grade of insulation
Measures to achieve the resulting
Safety status of the AC-DC
between input and output
safety status of the output circuit
converter output circuit
provided by the AC-DC converter
Mains
Double or reinforced
Earthed case 1 and installation
SELV circuit
≤250 V AC
according to the applicable standards
1 The earth connection has to be provided by the installer according to the relevant safety standards, e.g. IEC/EN 60950.
AC-DC
con-
verter
Mains
SELV
Earth connection
+
–
~
10021
Fuse
Fig. 30
Schematic safety concept. Use fuses and earth connec-
tion as per: Installation Instructions and table: Safety con-
cept leading to an SELV output circuit
.
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