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引用第6楼wolfxu于2011-02-14 13:53发表的 :+ G2 {+ F" E1 I) q! {5 U$ u
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我一直搞不明白什么是直流电网电源。哪位可以帮忙解释一下? EN60950说得很清楚了。
$ D- k a' m4 M- X) ~1.2.8.2
# B0 u- m# }" j; A# k4 I6 JDC MAINS SUPPLY
) U* H6 V% @: ?0 V( Q, z& Td.c. power distribution system, with or without batteries, external to the equipment, for2 x2 w' n& o, \. v
supplying power to d.c. powered equipment, excluding the following:+ s, X( m0 o/ i8 a+ c+ s7 v
− a d.c. supply providing power over TELECOMMUNICATION NETWORK wiring to remote
- l0 i8 @8 t9 Lequipment;
$ u3 ]+ o6 q; I, }3 Z/ x− a limited power source (see 2.5) whose open circuit voltage is less than or equal to
2 l1 h, u+ w8 D, n7 k42,4 V d.c.;$ g+ {) d: l7 M0 g
− a d.c. supply whose open circuit voltage is greater than 42,4 V d.c. and less than or equal
5 W$ b8 Z# V8 N9 ]" Vto 60 V d.c., and whose available power output is less than 240 VA+ ]2 R0 d3 _- c* y, Z7 n$ t
Circuitry connected to a DC MAINS SUPPLY is considered to be a SECONDARY CIRCUIT (for
! t2 [) @; V$ W) R. U0 Vexample, an SELV CIRCUIT, a TNV CIRCUIT or a HAZARDOUS VOLTAGE SECONDARY CIRCUIT) in the6 P' y) |+ Q- b# H2 z" Z* i
meaning of this standard.
& i2 A7 e3 B1 E& W8 }/ NNOTE See ITU-T Recommendation K.27 for bonding configurations and earthing inside a telecommunication2 Y/ M$ Y8 ~7 j2 V
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