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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。
- K, _, j# U# u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3 K& B% x0 K8 v2 D+ ^8 S
还请各位大佬解惑，谢谢！+ ^2 t% G1 Y9 [" H8 v
iec 61347-1 15.4
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NOTE At present on the market the following types of control systems are available:7 T3 A& J3 @' H3 K/ K% n! S, y
– FELV control signal, basic insulated to LV supply (e.g. Digital Addressable Lighting Interface and 0 to 10 V);
/ D4 X% }4 r# J" I1 @– SELV control signal, (e.g. DMX);& H) G! [1 C) d+ F: d) C2 N' ~3 v
– control signal, not insulated to LV supply (e.g. Push button control/phase cut/step dim).
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The voltage in the circuits shall not be higher than the limits defined for ELV.% @' R! h* ?2 S1 J$ N. S/ R
, S4 Y- d: ]4 E# m! W8 nSELV circuits shall be insulated from the LV supply by double or reinforced insulation (based& ]* T7 e- ]2 B/ E+ Q* y
upon a working voltage across the insulation).
' W, _4 n7 q' |! L) F7 _+ jSELV circuits shall be insulated from other non SELV circuits (except FELV) by double or( b& b/ W: L1 s( d0 x; c
reinforced insulation (based upon a working voltage equal to highest voltage in the circuits).
! I# H/ z! u0 {! Y' T6 rSELV circuits shall be insulated from FELV circuits by supplementary insulation (based upon* C" P) z6 H3 S- y' o) S
a working voltage equal to LV supply voltage).5 b$ k6 C( I4 @' {+ i
SELV circuits shall be insulated from other SELV circuits by basic insulation (based upon a
) ^4 X2 L8 J7 s9 N( X5 _1 Bworking voltage equal to highest voltage in the circuits).
6 y+ C2 c; S$ q6 T; X, ?. g& b) oSELV circuits shall be insulated from accessible conductive parts by insulation according to
* [8 ^5 S, U) d' V) C' ?7 D) p4 a9 f: ATable 6 in 15.4.5.1 w3 v5 w% @) {! T7 [
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发表于 2018-10-24 17:20
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