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引用第6楼wolfxu于2011-02-14 13:53发表的 :2 f0 M0 \7 D9 H
9 o" ] |+ d) `+ `& W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。
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DC MAINS SUPPLY a9 o4 X; ^9 l- @
d.c. power distribution system, with or without batteries, external to the equipment, for) g- ]; ]; u. x
supplying power to d.c. powered equipment, excluding the following:' x; |- n5 o0 l
− a d.c. supply providing power over TELECOMMUNICATION NETWORK wiring to remote
+ z3 r- ~& F1 f) Tequipment;
- l6 Z& J, c& F# K1 l− a limited power source (see 2.5) whose open circuit voltage is less than or equal to+ n$ w4 \) u* }/ Q+ C8 N
42,4 V d.c.;
# {8 Y9 n/ |2 f6 J8 q2 ^7 v6 m& ~− a d.c. supply whose open circuit voltage is greater than 42,4 V d.c. and less than or equal: c, J% b( C- B0 j$ z9 H: }
to 60 V d.c., and whose available power output is less than 240 VA- B$ B' n2 G: |
Circuitry connected to a DC MAINS SUPPLY is considered to be a SECONDARY CIRCUIT (for
2 }1 o7 f7 U/ f2 {* q1 ^example, an SELV CIRCUIT, a TNV CIRCUIT or a HAZARDOUS VOLTAGE SECONDARY CIRCUIT) in the4 T4 b: _4 [: ~7 A2 Y
meaning of this standard.
5 B8 s. r1 F5 m0 i# e1 [3 zNOTE See ITU-T Recommendation K.27 for bonding configurations and earthing inside a telecommunication
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