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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。9 ?1 R$ X& T* ~! e! 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 a- ?+ A6 k2 ?; q8 |* z
还请各位大佬解惑，谢谢！
D# j! {' q/ U2 U# niec 61347-1 15.40 J, u5 F% ~6 j5 I T% J: |4 h: @6 M
2 u o7 B* W$ |" ENOTE At present on the market the following types of control systems are available:
3 ~; \7 X N. c– FELV control signal, basic insulated to LV supply (e.g. Digital Addressable Lighting Interface and 0 to 10 V);5 F7 K3 }4 j5 P
– SELV control signal, (e.g. DMX);9 @6 X4 y5 f/ X& ?+ L, B( i
– control signal, not insulated to LV supply (e.g. Push button control/phase cut/step dim).
( R3 k2 g' \9 J6 i8 ^
, _7 a1 d& b5 X5 i" OThe voltage in the circuits shall not be higher than the limits defined for ELV.' B0 k* S& ^+ M
3 S5 d6 s/ G' X M+ ?SELV circuits shall be insulated from the LV supply by double or reinforced insulation (based
( {% H& _4 u3 t4 m( hupon a working voltage across the insulation).( ?, M. V3 F- {4 D
SELV circuits shall be insulated from other non SELV circuits (except FELV) by double or
- c' }& b9 y; u( ~9 y Xreinforced insulation (based upon a working voltage equal to highest voltage in the circuits).
3 x6 h4 ?' |7 Y/ c+ K2 ?) RSELV circuits shall be insulated from FELV circuits by supplementary insulation (based upon
: u( A0 X& p+ e( g% na working voltage equal to LV supply voltage).& o4 |7 i; s) `- r) T- C, Z
SELV circuits shall be insulated from other SELV circuits by basic insulation (based upon a& D+ I6 w, B; l9 \8 r5 X9 D
working voltage equal to highest voltage in the circuits).
, d3 Y Z5 P9 s4 e& d: a C8 u$ YSELV circuits shall be insulated from accessible conductive parts by insulation according to+ l: m- t' G7 O o: u1 q6 m
Table 6 in 15.4.5.2 I) _$ A" ~1 ^( O h% {
4 K" T) z3 G8 P5 G8 X& C5 d q; q
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发表于 2018-10-24 17:20
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