帮忙分析下IEC61000-4-6 CS CDN M3电源端的校准连接原理两份电路有多大差别？
以下是我整理了一下的 IE361000-4-6CS CDN M3电源端的校准连接原理电路，我查找了些资料，介绍有两种连接方式，请教下这两种电路有多大差异？是否有一种是错误的呢？ 还想请教一下，标准上说 电感L 要大于280uH?这280这个参数是怎么得来的呢？本人觉得肯定是与阻抗匹配有关，但具体怎么算出来的不吝高手详解下，THANKS! 化二，你看下这两个电路是不是有一个不对啊，图一 PE线端也接地了，那就是L线和N线也直接接地了，那L线和N线接的150欧姆电阻是不已经没有作用了呢？电感对频率高的信号有较大的阻抗，[img]在 IEC61000-4-6里面有这么一段文字：6.2 Coupling and decoupling devices
Coupling and decoupling devices shall be used for appropriate coupling of the disturbing signal
(over the entire frequency range, with a defined common-mode impedance at the EUT port) to
the various cables connected to the EUT and for preventing applied test signals from affecting
other devices, equipment and systems that are not under test.
The coupling and decoupling devices can be combined into one box (a coupling/ decoupling
network, CDN) or can consist of several parts. The main coupling and decoupling device
parameter, the common-mode impedance seen at the EUT-port, is specified in Table 3.
Table 3 – Main parameter of the combination of the coupling and decoupling device
Frequency band
Parameter0,15 MHz – 26 MHz 26 MHz – 80 MHz
| Zce|150 Ω ± 20 Ω 150 Ω + 60 Ω – 45 Ω
TE 1 Neither the argument of Zce nor the decoupling factor between the EUT port and the AE port are specified
parately. These factors are embodied in the requirement that the tolerance of |Zce| shall be met with the AE-port
en or short-circuited to the ground reference plane. 所以 我觉得 那个电感值在150KHZ时 取值为L ≥ 280 μH与以上所叙述的所谓阻抗要求有关。但根据电路，我不知道这个值是如何算出来的。 mark对标准这块研究的很细，赞一个，这种问题，很有挑战。 岛主过奖了，贴另外附上 标准上给出的 ZCE 确认原理图， 上图的 CDN它的电路就是CDN M1/M2/M3电路举例那幅图， 求教！ mark 发表于 2012-4-28 20:57
上图的 CDN它的电路就是CDN M1/M2/M3电路举例那幅图， 求教！
这个问题解决了吗？
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