LN之间X电容的问题

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xuccmm 发表于 2016-2-24 17:14
; G* {; J) A$ W% T) N  |; c1 B按IT/AV产品标准做的话，没有问题，只要在保险丝后面就OK

6 h& d9 t5 m! w" J# ^6 _如果是灯的呢？有没有这方面的经验或案例

wyq794

不需要安规电容，但是做认证时，一般会控制其电容参数，比如额定电压，容量，温度；
- }1 P4 g* q/ }* L+ O- D8 T. I举个例子，一般的小夜灯或者非隔离的电源，保险丝之后，很多采用的都是阻容降压方式工作的；直接用一个CBB电容并电阻然后带灯珠，即可正常工作。

nany

可以没有这个容，但是如果有就一定要是安规电容，见24.1.1

ljh809809

A capacitor connected between two line conductors in a PRIMARY CIRCUIT, or between one line
conductor and the neutral conductor or between the PRIMARY CIRCUIT and protective earth
shall comply with one of the subclasses of IEC 60384-14 and shall be used in accordance
) m( t# @5 R0 o( K9 a4 P4 p9 dwith its rating. This requirement also applies to a capacitor bridging DOUBLE INSULATION or
+ H- M& m! w# |REINFORCED INSULATION elsewhere in the equipment. The details of the damp heat, steady
state test as specified in 4.12 of IEC 60384-14 shall be as follows:
。。。
Rules for the application of Table 1C
: S8 ~( d& _$ Q* O1 Capacitors used to bridge BASIC INSULATION, SUPPLEMENTARY INSULATION or REINFORCED INSULATION shall be
! F! T. [& L" }5 F% dclass Y except that it is permitted to bridge BASIC INSULATION in a SECONDARY CIRCUIT by a class X capacitor.
, O% D. g3 A# T; P( G0 }: _2 For a single capacitor bridging FUNCTIONAL INSULATION, BASIC INSULATION, SUPPLEMENTARY INSULATION or
8 A( e* s# Y. n( P. O9 C) ^7 hREINFORCED INSULATION, the voltage rating of the single capacitor shall be at least equal to the RMS WORKING
VOLTAGE across the insulation being bridged, determined according to 2.10.2.2.
+ \  T" k6 ^) a, H" ~8 U这里强调的是L与L之间，L与N之间的绝缘是功能绝缘，而不在于电容前端是否有电阻，所以我个人认为嘴跨接在L与L之间或L与N之间的电容仍然是安规电容，需要符合IEC 60384-14的要求。
) @8 }- s- a% o$ p3 v
6 i" K0 C9 _. T/ g3 i