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各位大佬，求指点，最近遇到 一款带有 调光功能的 LED SELV驱动，含有两个变压器，两路输出，认证时 判断输出隔离问题被卡住了，调光信号输入部分 与 两个输出 要有相应隔离 标准中说了，可以理解。
2 k! n, O! S/ a& o但为何要将同一 二次侧的 两个 输出，判定为两个SELV电路，要求有隔离？这个不是太能理解
( t# A/ X% D0 m" w) Q还请各位大佬解惑，谢谢！
! s4 y( W8 m/ w: P Y; _( jiec 61347-1 15.4- c4 A4 e1 H+ ]% c3 I& D' p
/ v/ @0 x" o& i @NOTE At present on the market the following types of control systems are available:* w U' S! ~1 |0 t3 a
– FELV control signal, basic insulated to LV supply (e.g. Digital Addressable Lighting Interface and 0 to 10 V);
4 C8 ^$ @. G8 j9 ~; d" |* r– SELV control signal, (e.g. DMX);
' I- z: t( j+ v3 I1 L# {8 }' w* j– control signal, not insulated to LV supply (e.g. Push button control/phase cut/step dim).5 T3 |: B( c. x( I y
3 h3 k, W! h* ~( L7 I2 S/ q. u
The voltage in the circuits shall not be higher than the limits defined for ELV.7 g) \ Q }( l# U
8 I( }7 G; ?3 u8 |# F- X+ VSELV circuits shall be insulated from the LV supply by double or reinforced insulation (based
- y' o6 g6 ~4 Z1 c6 \upon a working voltage across the insulation).& f1 R7 L8 n( N
SELV circuits shall be insulated from other non SELV circuits (except FELV) by double or
# Y$ A+ Z3 ?$ `; p9 O1 E, r6 L Xreinforced insulation (based upon a working voltage equal to highest voltage in the circuits).1 _3 Z, p/ A1 z9 Y( @2 G5 ~
SELV circuits shall be insulated from FELV circuits by supplementary insulation (based upon
4 P; y- c8 A: A7 [# X3 Aa working voltage equal to LV supply voltage).
2 _. s4 i) o5 X5 p! n- C4 g. _SELV circuits shall be insulated from other SELV circuits by basic insulation (based upon a
7 e) F0 Y: ]/ Gworking voltage equal to highest voltage in the circuits).
. V3 J: H- {' o' t) ~SELV circuits shall be insulated from accessible conductive parts by insulation according to
) V$ ^# D% Q. J! g' `- d$ NTable 6 in 15.4.5.* m+ R @2 M/ H2 a7 I7 S3 O
4 a) d6 Q. O- T. M2 T! a |
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发表于 2018-10-24 17:20
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