|
|
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。
5 i: k0 O% D# g& {0 X9 A% t& g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 P; Q: Y; L! I, Z5 Z/ H* \
还请各位大佬解惑，谢谢！
V3 K" W+ S6 k% ?- R, Eiec 61347-1 15.4
1 L- p7 L- Q& _
T9 k! T) p0 j6 d/ C5 \. T" FNOTE At present on the market the following types of control systems are available:
" ?- |8 T. O8 t" Q8 H, N1 K" `– FELV control signal, basic insulated to LV supply (e.g. Digital Addressable Lighting Interface and 0 to 10 V);9 Q r: `8 R; N6 Y! ^! j
– SELV control signal, (e.g. DMX);
& j4 l$ i) n% v% W" H" ?– control signal, not insulated to LV supply (e.g. Push button control/phase cut/step dim).
6 |; |# S$ N( U5 h. I+ ~: E0 }% {6 `8 H: Q" T9 U. ^
The voltage in the circuits shall not be higher than the limits defined for ELV.3 m, [% r; Q; c, t9 A( ?
1 s+ P) e4 B" ]- \
SELV circuits shall be insulated from the LV supply by double or reinforced insulation (based. R7 a% w' e* s( l1 ?1 u# _
upon a working voltage across the insulation).
- @7 z3 @! u. @SELV circuits shall be insulated from other non SELV circuits (except FELV) by double or
; B# v ?5 T8 ^7 s3 F% Areinforced insulation (based upon a working voltage equal to highest voltage in the circuits).: g9 \$ f8 y& h5 T; P# K `: t3 u
SELV circuits shall be insulated from FELV circuits by supplementary insulation (based upon
1 L8 M2 ]6 f5 T; @! za working voltage equal to LV supply voltage).3 V6 W3 F2 R1 S8 M U
SELV circuits shall be insulated from other SELV circuits by basic insulation (based upon a
( h6 @1 {) }) r+ f: y6 C$ }9 |working voltage equal to highest voltage in the circuits).
4 L5 S+ f1 s3 T7 [2 w! gSELV circuits shall be insulated from accessible conductive parts by insulation according to
. G* ]* n( P8 Z7 xTable 6 in 15.4.5.
0 L7 m1 N, a6 _; h$ o4 l
4 O: _2 ?) m/ d; Y3 Q* B* j |
本帖子中包含更多资源
您需要 登录 才可以下载或查看，没有账号？注册安规
x
|
/1 
|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
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