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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。 u# T) C, [1 k3 X- L
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; ] ^* V: v3 l
还请各位大佬解惑，谢谢！$ r* c8 E- G" y$ c/ j
iec 61347-1 15.40 ~) P' I( P8 G+ ?* Z
5 R4 C% L- H' ^% U' x6 fNOTE At present on the market the following types of control systems are available:
' y7 K" Q- r$ n0 D, S– FELV control signal, basic insulated to LV supply (e.g. Digital Addressable Lighting Interface and 0 to 10 V);. D7 q1 v5 R4 E& L6 i
– SELV control signal, (e.g. DMX);) [' A; r; \* v9 W' b
– control signal, not insulated to LV supply (e.g. Push button control/phase cut/step dim).6 F8 N+ z7 l' a6 Y
- X" L! V# [4 \# \8 z. n& q. I; |8 ~The voltage in the circuits shall not be higher than the limits defined for ELV.
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, U! |6 G+ G* h9 J) }; HSELV circuits shall be insulated from the LV supply by double or reinforced insulation (based
9 G J8 k( f# B* e8 Z0 aupon a working voltage across the insulation).* v8 F. r$ b: X& `& Q
SELV circuits shall be insulated from other non SELV circuits (except FELV) by double or/ f! X' B7 s7 K# c/ Y" a
reinforced insulation (based upon a working voltage equal to highest voltage in the circuits).
# B& s5 z. x0 \% XSELV circuits shall be insulated from FELV circuits by supplementary insulation (based upon
~, E* A8 e. z# Y/ U- Aa working voltage equal to LV supply voltage)." [& q& ~! P l5 j: u. x
SELV circuits shall be insulated from other SELV circuits by basic insulation (based upon a( N2 u: f5 ~& i% s e& e$ l5 F
working voltage equal to highest voltage in the circuits).* z3 `& W) J; C% w( ^6 c
SELV circuits shall be insulated from accessible conductive parts by insulation according to$ {1 f% b; t5 D1 B* \4 o/ I) ?
Table 6 in 15.4.5." B, z. O; j" T1 [4 U
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发表于 2018-10-24 17:20
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