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引用第6楼wolfxu于2011-02-14 13:53发表的 :
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! B6 n& H4 `; F8 [/ e* C' d5 c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。" ?) q0 C! G! Q: x1 \: j1 _1 d
1.2.8.2
5 j% c) L- D7 J4 Z5 `DC MAINS SUPPLY
% q) E5 S* f( Qd.c. power distribution system, with or without batteries, external to the equipment, for" O" d" T4 D3 ^, b6 T5 p
supplying power to d.c. powered equipment, excluding the following:
* U3 K1 }, i8 q2 w3 U; ^− a d.c. supply providing power over TELECOMMUNICATION NETWORK wiring to remote
3 o9 b! F6 K' b$ D6 Y! |equipment;
0 d, M* n6 X$ U/ h− a limited power source (see 2.5) whose open circuit voltage is less than or equal to4 E0 W% c; O# e* D
42,4 V d.c.;
& ^+ i) A8 z5 Y& o* P; G2 j# a− a d.c. supply whose open circuit voltage is greater than 42,4 V d.c. and less than or equal
4 s1 h% p l7 H1 E8 a9 {to 60 V d.c., and whose available power output is less than 240 VA6 t' N0 U+ q: X. k8 q
Circuitry connected to a DC MAINS SUPPLY is considered to be a SECONDARY CIRCUIT (for
% ^+ K5 m1 h U2 C/ [# R* Gexample, an SELV CIRCUIT, a TNV CIRCUIT or a HAZARDOUS VOLTAGE SECONDARY CIRCUIT) in the
1 G! C( Q/ J( w3 ?' K: Omeaning of this standard., g9 |7 z9 }8 ^, n, L& ]5 I
NOTE See ITU-T Recommendation K.27 for bonding configurations and earthing inside a telecommunication. D5 }& _5 W ^* Y) a
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