|
|
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。* z" x" R) Z6 T! s5 `+ H, E
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% ?% S' k% L" b; L9 F+ V
还请各位大佬解惑，谢谢！
' a( e) I( x3 j# a8 F$ t' q! eiec 61347-1 15.40 [! `4 ]# H" Q8 G( `' F; k
! {2 G+ w# h) U
NOTE At present on the market the following types of control systems are available:1 o% D. ?& G# X/ ^' x
– FELV control signal, basic insulated to LV supply (e.g. Digital Addressable Lighting Interface and 0 to 10 V);
1 T" a8 ?5 ^0 X) @1 U– SELV control signal, (e.g. DMX);
( R# d. b3 e B1 X* h, W) \* q– control signal, not insulated to LV supply (e.g. Push button control/phase cut/step dim).% A- g* Q; e$ q6 ~0 j8 T
! v M% `2 {' f# w0 r: p eThe voltage in the circuits shall not be higher than the limits defined for ELV.
, B' p+ i2 Z" l! d2 P! q8 K
: U! ~/ ^7 @+ P: ~SELV circuits shall be insulated from the LV supply by double or reinforced insulation (based7 u0 C1 x9 b+ F
upon a working voltage across the insulation).1 k4 C; L7 r t7 @* w: d8 z8 H4 r
SELV circuits shall be insulated from other non SELV circuits (except FELV) by double or ]3 O- k5 r T. V# l! p {! L. s
reinforced insulation (based upon a working voltage equal to highest voltage in the circuits).
. {/ }9 W$ s5 S* a/ ~SELV circuits shall be insulated from FELV circuits by supplementary insulation (based upon- u% O7 T- B3 ]2 Z9 H) Z
a working voltage equal to LV supply voltage).: a* b+ Q) L: G- x& [3 X
SELV circuits shall be insulated from other SELV circuits by basic insulation (based upon a
4 Q% L* R3 h& jworking voltage equal to highest voltage in the circuits).1 ~1 H/ c9 y4 Q
SELV circuits shall be insulated from accessible conductive parts by insulation according to
( [3 K ^6 m) z8 |* }Table 6 in 15.4.5.
0 _" W% k! V0 N- p! r+ u
+ M6 ]' g! v+ {. [ R' M |
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
|
/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
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