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引用第6楼wolfxu于2011-02-14 13:53发表的 :
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8 H+ r* y5 K8 P% M+ 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。# {8 B* G& R3 d; Q7 w+ H8 k5 J
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DC MAINS SUPPLY" S4 D, Y5 L4 @" O
d.c. power distribution system, with or without batteries, external to the equipment, for
! t8 }$ l( l" F( O, K/ ]+ Dsupplying power to d.c. powered equipment, excluding the following:& y. [5 }" r7 g" r# i0 ^/ b
− a d.c. supply providing power over TELECOMMUNICATION NETWORK wiring to remote% ~- s! \) A8 r1 X& A
equipment;: P2 r: N. q6 f
− a limited power source (see 2.5) whose open circuit voltage is less than or equal to
% ]6 k* P% Y$ E U% m5 b42,4 V d.c.;
- s. I- n8 ]4 A8 r- X) A3 p: J− a d.c. supply whose open circuit voltage is greater than 42,4 V d.c. and less than or equal
4 C; T! G, Q' U- k* ^! h- o8 m2 B- qto 60 V d.c., and whose available power output is less than 240 VA' v. } J1 K: T8 b
Circuitry connected to a DC MAINS SUPPLY is considered to be a SECONDARY CIRCUIT (for
8 B! N- Y, o2 [. G3 Q4 {8 Hexample, an SELV CIRCUIT, a TNV CIRCUIT or a HAZARDOUS VOLTAGE SECONDARY CIRCUIT) in the! ?1 t1 h' B1 A* \% n* \+ v c
meaning of this standard./ h5 V( \: _. n a/ K: u- Z
NOTE See ITU-T Recommendation K.27 for bonding configurations and earthing inside a telecommunication
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