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1 引言 本文阐述了一种用于交流电源滤波器的新型磁路。这种设计在一个宽的频带内具有高的衰减。对交流电源滤滤器来说,如果不是很好地接地或者将其装到没有接地端的设备中时,很少能在宽频带内较强地衰减共模感应噪声。从结构上来说,造成这种性能较差的原因有两个,原因之一是这种广泛使用的圆环形线圈输入输出端之间的寄生电容很大,高频噪声容易通过。另一个原因是滤波器接地电容不能正常工作,除非接地端真正接地。
1 Introduction This article describes a new type of magnetic circuit for AC power filters. This design has a high attenuation over a wide frequency band. For AC power filters, it is seldom able to attenuate common mode induced noise in a wide frequency band if not properly grounded or installed in an ungrounded device. Structurally speaking, two reasons contribute to this poor performance. One of the reasons for this is that the parasitic capacitance between the input and output terminals of this widely used toroidal coil is large and high frequency noise is easily passed. Another reason is that the filter capacitor can not work properly unless the ground is actually grounded.