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參數(shù)資料
| 型號(hào)： | CSR2024-7R |
| 廠商： | POWER-ONE INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 20 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁(yè)數(shù)： | 11/11頁(yè) |
| 文件大?。?/td> | 394K |
| 代理商： | CSR2024-7R |
Industrial Environment
DC-DC Converters <40 Watt
SR Series
Edition 4/6.99
9/11
MELCHER
The Power Partners.
Table 8: Insulation concept leading to an SELV output circuit
Conditions Front end
DC-DC converter
Result
Supply
Minimum required grade
Maximum
Minimum required safety
Measures to achieve the
Safety status of
voltage
of isolation, to be provided DC output
status of the front end
specified safety status of the
the DC-DC
by the AC-DC front end,
voltage
output circuit
converter output
including mains supplied
from the
circuit
battery charger
front end 1
Mains
Operational (i.e. there is
≤180 V 1
Primary circuit
Basic insulation, based on
Earthed SELV
≤250 V AC no need for electrical
250 V AC (provided by the
circuit
isolation between the main
DC-DC converter), input
supply voltage and the
fuses 2, output suppressor
DC-DC converter input
diode 3, earthed output circuit
voltage)
and earthed 4 or non user
accessible case 5
Basic
≤60 V 6
Earthed SELV circuit 4
Operational insulation (pro-
SELV circuit
vided by the DC-DC converter)
Supplementary
ELV circuit
Basic insulation, based on
>60 V 1
Unearthed hazardous
250 V AC (provided by the
voltage secondary circuit 5
DC-DC converter)
Double or reinforced
≤60 V 1
SELV circuit
Operational insulation (pro-
vided by the DC-DC converter)
≤120 V 6
TNV-3 circuit
Basic insulation, based on the
>60 V 1
Double or reinforced insu-
maximum output voltage from
lated unearthed hazardous
the front end (provided by the
voltage secondary circuit 6
DC-DC converter)
1 The front end output voltage should match the specified input voltage range of the DC-DC converter. The nominal voltage between
any input pin and earth can be up to 250 V AC or 400 V DC.
2 The installer shall provide an approved fuse (type with the lowest rating suitable for the application) in both input lines directly at the
input of the DC-DC converter (see fig.:
Schematic safety concept). For UL’s purpose, the fuse needs to be UL-listed.
3 The suppressor diode should be dimensioned in such a way, that in the case of an insulation fault the diode is able to limit the output
voltage to SELV (<60 V) until the input fuse blows (see fig.:
Schematic safety concept).
4 The earth connection has to be provided by the installer according to the relevant safety standard, e.g. IEC/EN 60950 (see also fig.:
Schematic safety concept).
5 Has to be insulated from earth by at least supplementary insulation according to the relevant safety standard, based on the maximum
output voltage from the front end.
6 The front end output voltage should match the specified input voltage range of the DC-DC converter.
7 Has to be insulated from earth by at least supplementary insulation according to the relevant safety standard, based on the maximum
mains supply voltage.
AC-DC
front
end
DC-DC
con-
verter
Mains
Suppressor
diode
SELV
Earth
connection
+
–
~
10023
Battery
Max. 250 V AC
or 400 V DC
Max. 250 V AC
or 400 V DC
Fuse
Fig. 10
Schematic safety concept. Use fuse, suppressor diode
and earth connection as per table Safety concept leading
to an SELV output circuit
.
Safety of operator accessible output circuit
If the output circuit of a DC-DC converter is operator acces-
sible, it shall be an SELV circuit according to the IEC/EN
60950 related safety standards
The following table shows some possible installation con-
figurations, compliance with which causes the output circuit
of the DC-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 44 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.
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