Self-shielded low-pass filter module

Abstract

The present invention relates to a self-shielded low-pass filter module. The self-shielded low-pass filter module comprises a plurality of filter units, and each filter unit comprises an inductor assembly and a capacitor assembly; each capacitor assembly is provided with a groove, and the bottom of each groove is provided with a through hole; and the inductor assemblies are embedded into the grooves of the capacitor assemblies, the top portions of the inductor assemblies are connected with metal joints, the metal joints can be in cooperating connection with the through holes, and the bottom portions of the inductor assemblies are connected with the inner-side surfaces of the inductor assemblies. According to the invention, the inductor assemblies are inlaid in the capacitor assemblies so that while electromagnetic shielding is realized, space inside structural capacitors is fully utilized, and miniaturization and high-frequency suppression of a filter are realized. For the purpose of enhancing the filtering effect, multiple modules can be cascaded, the order of the filter is increased, while the filter is enabled to have steeper insertion loss characteristics, external plate layers can be connected with one another, good grounding and electromagnetic shielding are realized, the effect of inhibiting EMI noise radiation and conduction is quite good, and the performance and the application prospect are quite good.

Description

technical field [0001] The invention relates to the field of filters, in particular to a self-shielding low-pass filter module. Background technique [0002] With the rapid development of power electronics technology, electronic equipment will generate electromagnetic interference signals during operation. The increasingly complex electromagnetic environment requires electronic equipment and power supplies to have higher electromagnetic compatibility performance. Therefore, measures to suppress electromagnetic interference have also received increasing attention. The main There are grounding, shielding and filtering, and the use of shielded EMI filters can effectively suppress electromagnetic interference. [0003] There are currently two types of filters. One is a discrete filter, and the other is an integrated filter. Discrete filter is to weld discrete capacitor and inductance components on the printed circuit board. This kind of filter can achieve different filtering e...

AI Technical Summary

Problems solved by technology

In addition, due to the wide variety of current filters and poor filtering characteristics, high-frequency filtering has always been a difficult problem to solve. The highest effective filtering frequency of ordinary power filters can only reach 30MHz, and the filtering flux of signal cables The filtering effect is extremely limited, and the shielding measures are very poor, so it is very vulnerable to external electromagnetic coupling interference

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