|
|
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。
s) [$ O6 w! C. s; c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
5 Y" N* v* M, B. @( q还请各位大佬解惑，谢谢！
; ]" H* Z; d) Uiec 61347-1 15.4
" D( C. N# J4 k' N8 R+ z3 K
0 v7 D; M2 P* M/ ]( p8 }% ONOTE At present on the market the following types of control systems are available:( [% } [) C; }- U9 r0 S
– FELV control signal, basic insulated to LV supply (e.g. Digital Addressable Lighting Interface and 0 to 10 V);1 |% ^& I6 h' w2 Z3 d1 y( K9 E
– SELV control signal, (e.g. DMX);
5 J8 ?) x d( B, e/ Q– control signal, not insulated to LV supply (e.g. Push button control/phase cut/step dim).
5 e" B' `. A& _" s
; V( s8 U+ J0 v! ` l+ N6 ]& wThe voltage in the circuits shall not be higher than the limits defined for ELV.! R$ N0 M" D/ R1 F& T6 N- v% S% U: s
5 C8 B0 a2 H9 b+ E3 b' V
SELV circuits shall be insulated from the LV supply by double or reinforced insulation (based
& U6 }7 P1 T9 o- {9 K/ Y& Eupon a working voltage across the insulation).: J) i% c: g3 X6 \. U
SELV circuits shall be insulated from other non SELV circuits (except FELV) by double or
3 y }8 J1 Z' [) \6 }reinforced insulation (based upon a working voltage equal to highest voltage in the circuits).
4 Y4 K* g; w' e6 ?! } w! d oSELV circuits shall be insulated from FELV circuits by supplementary insulation (based upon
' v3 v/ q) a/ l1 v( S" la working voltage equal to LV supply voltage).& T- |8 K* P- c, K) k
SELV circuits shall be insulated from other SELV circuits by basic insulation (based upon a/ v) U a7 L1 M8 V
working voltage equal to highest voltage in the circuits).7 y6 A/ A1 J1 S7 s4 [5 Z' Y, ]
SELV circuits shall be insulated from accessible conductive parts by insulation according to
' K6 M# o3 ~" K' \9 |& r& LTable 6 in 15.4.5.% A. U" r' L' z8 t1 x7 P: n
9 C# U9 \( V; D
|
本帖子中包含更多资源
您需要 登录 才可以下载或查看，没有帐号？注册安规
x
|
/2 
|关于安规|小黑屋|安规QQ群|Archiver|手机版|安规网
( 粤ICP13023453-10 ) 
窥视卡
雷达卡
发表于 2018-10-24 17:20
收藏
分享
好帖
鸡蛋
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
抢沙发
千斤顶
显身卡
楼主