标题: LED 驱动 不同电路之间隔离问题 [打印本页] 作者: 我喜欢看你笑 时间: 2018-10-24 17:20 标题: LED 驱动 不同电路之间隔离问题 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。 ~7 A( L s0 e* @# A1 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& u; V2 m1 W: a$ E* _- o \6 N. q, Y- i
还请各位大佬解惑，谢谢！ ! @$ ~0 y+ L p# T. L9 @% P3 {iec 61347-1 15.4 8 e) A: J) \3 x " d4 i8 L% J5 m! F. N" f6 t& G6 |NOTE At present on the market the following types of control systems are available: + V# X8 l$ ^$ C7 ]2 o% r– FELV control signal, basic insulated to LV supply (e.g. Digital Addressable Lighting Interface and 0 to 10 V);: _5 f) g6 V1 i1 w# Y& b
– SELV control signal, (e.g. DMX);! a' h) A5 N, T# x3 E, Y8 j' k
– control signal, not insulated to LV supply (e.g. Push button control/phase cut/step dim).' y3 `# v ?( @
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The voltage in the circuits shall not be higher than the limits defined for ELV. 4 A& O8 v! f6 O+ f; a! o0 m# [( P' a2 Z) L5 B; ^8 K; m
SELV circuits shall be insulated from the LV supply by double or reinforced insulation (based - K1 f! q7 z& ]- D4 p" }9 ~upon a working voltage across the insulation).) E: M* T" J3 N! b- d
SELV circuits shall be insulated from other non SELV circuits (except FELV) by double or 4 X) v- p- {4 G6 Wreinforced insulation (based upon a working voltage equal to highest voltage in the circuits)./ L7 x6 w, d" C9 e2 F
SELV circuits shall be insulated from FELV circuits by supplementary insulation (based upon8 J, _( T1 c' N6 R
a working voltage equal to LV supply voltage).+ }. \$ c8 f7 n4 a) e
SELV circuits shall be insulated from other SELV circuits by basic insulation (based upon a 0 `7 c; t# J& G- Qworking voltage equal to highest voltage in the circuits). $ _% x9 {2 S% X1 S4 f0 ~SELV circuits shall be insulated from accessible conductive parts by insulation according to 0 i$ B! ~3 }4 n+ a, [) k P9 ATable 6 in 15.4.5.' U6 \) `6 I# K: r. m' M/ E; a