关键元器件参数测试在EMC设计中的应用
The Parameter Test of Critical Components in Use of EMC Design
摘要 通过对某产品的传导发射和辐射发射试验超标案例的分析,以及更换不同的变压器和采用相应的滤波措施后,发现超标原因是所用变压器的共模抑制性能不够,并搭建了一个共模抑制参数的测试装置证实了这一结论。最后,综合案例提出了一种新的EMC 设计方法,即在产品设计前就能够对EMC 关键器件的参数进行测试选择,直至建立一个EMC 器件参数库,实现了从定性设计为主到以定量设计为主的设计方法。
关键词 EMC;变压器;共模抑制;关键元器件
Abstract By analyzing the reason of failure for conducted emission and radiated
emission of a product, and after replacing different transformers and using relevant
filtering measures,the reason that the transformer lacks of the ability of common-mode
rejection is obvious. Then, the assumption is validated by setting up a testing device.
Finally,combined with the case proposed, a new method for EMC design is put forward
which is to test the parameters of EMC critical components ahead of product
design in order to establish a parameter library of EMC critical components. Thus, the
method of qualitative design could transfer to the method of quantitative design.
Keywords EMC;transformer;common-mode rejection;critical component
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