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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。
& M1 W0 g2 E# [# c- x9 x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8 r; Z6 f2 e( x
还请各位大佬解惑，谢谢！
5 r- d* p: c4 J) s' t) Oiec 61347-1 15.4+ E$ H0 x" {/ Z
* r8 t. u8 A, N3 b$ \/ o) H1 ^1 n
NOTE At present on the market the following types of control systems are available:; Y4 _2 c& g4 ?8 o. Z% X
– FELV control signal, basic insulated to LV supply (e.g. Digital Addressable Lighting Interface and 0 to 10 V);
& m! r8 d; G( e* r) l8 m A6 e9 }" ]– SELV control signal, (e.g. DMX);
C) n- j4 @8 A6 Y1 _3 `% T3 l; V– control signal, not insulated to LV supply (e.g. Push button control/phase cut/step dim).
/ G; I/ ~8 R7 y# R0 }9 V( D$ T5 A. G" E# S @
The voltage in the circuits shall not be higher than the limits defined for ELV.$ D C8 R, J/ ~/ ?* n
9 S1 F7 @; x6 i6 _/ m9 w R- vSELV circuits shall be insulated from the LV supply by double or reinforced insulation (based4 `9 D" |, C+ K |) {) y
upon a working voltage across the insulation).
2 J) y7 F" Y/ c7 ]7 FSELV circuits shall be insulated from other non SELV circuits (except FELV) by double or
& N) L; S1 i3 s8 {, X+ Ereinforced insulation (based upon a working voltage equal to highest voltage in the circuits).
# w6 @& w" G. aSELV circuits shall be insulated from FELV circuits by supplementary insulation (based upon
) x- x1 Z& Q" Sa working voltage equal to LV supply voltage).
; Y3 f6 T* ?2 r5 t0 j; Q# FSELV circuits shall be insulated from other SELV circuits by basic insulation (based upon a3 C; ?* H" s! M. u$ \/ g
working voltage equal to highest voltage in the circuits)., M# s4 U& { f' Y5 ]' |
SELV circuits shall be insulated from accessible conductive parts by insulation according to" Z, ^6 q$ \) F: V+ x8 U# A* b1 l
Table 6 in 15.4.5.8 K' c6 \0 w3 ]# ?
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发表于 2018-10-24 17:20
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