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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。 X0 K8 u; V# w/ o# y
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
1 _4 \9 S: S( j4 V2 n9 A还请各位大佬解惑,谢谢!
2 p6 S9 N W: }' ziec 61347-1 15.4 h9 s* f) o- `9 O
( w- o6 ]6 _/ LNOTE At present on the market the following types of control systems are available:
$ a3 v' }3 V: n" E– FELV control signal, basic insulated to LV supply (e.g. Digital Addressable Lighting Interface and 0 to 10 V);; I9 F7 E* U$ H6 j: [3 Z, A r
– SELV control signal, (e.g. DMX);( ~- ] U0 _, ~" ~
– 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.
7 ~( e" V" _% m+ O8 n
( f9 G5 W+ n. i1 `4 w# V& hSELV circuits shall be insulated from the LV supply by double or reinforced insulation (based
7 y0 r, M+ V5 _3 }4 U4 nupon a working voltage across the insulation).
/ G6 Y: k8 R" \/ ySELV circuits shall be insulated from other non SELV circuits (except FELV) by double or
7 M: R% B; p# ~( y" ^7 @8 w, x4 \reinforced insulation (based upon a working voltage equal to highest voltage in the circuits).
% B! ]+ b& S" M+ KSELV circuits shall be insulated from FELV circuits by supplementary insulation (based upon
1 w: T2 N y0 h5 za working voltage equal to LV supply voltage).3 T. _/ h9 W8 _5 g3 j1 u9 s1 X
SELV circuits shall be insulated from other SELV circuits by basic insulation (based upon a6 L4 e: B+ r6 e- D
working voltage equal to highest voltage in the circuits).
5 o0 G9 I5 C) A \: K, ZSELV circuits shall be insulated from accessible conductive parts by insulation according to, U' W) `3 f8 o( _, u% U" L
Table 6 in 15.4.5.5 N1 N2 S. S6 R. C1 ^
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