a filter component

Abstract

The invention provides a filter assembly. The filter assembly comprises a filter and a housing used for shielding external electromagnetic interference, wherein the filter is arranged inside the housing; the filter comprises a signal filtering circuit and a power supply filtering circuit; the power supply filtering circuit comprises an anti-reversal connection protection module and a voltage amplitude-limiting protection module; the housing comprises a front cover plate, a ground plate and a rear cover plate; the front cover plate comprises a plane plate, one side surface of the plane plate is vertically provided with a planimetrically enclosed shielding wall, and the shielding wall and the plane plate are integrally processed workpieces; the rear cover plate is of a cavity structure whose single surface is open, and the outer rim of the rear cover plate is not greater than the outer rim of the ground plate; the ground plate and the rear cover plate are each provided with assembling through holes adapted to the positions and sizes of installation column screw holes; and the side wall of the rear cover plate is provided with a plurality of output joints, and a plurality of input joints are arranged in the area of the shielding wall on the plane plate. The filter assembly has the following advantages: the space utilization rate of the filter assembly is high, the power supply filtering circuit has a protection function and is low in power consumption, and the filter assembly is suitable for application in a complex environment.

Description

technical field [0001] The invention relates to the field of electromagnetic compatibility, in particular to a filter assembly. Background technique [0002] As a device for filtering out clutter signals in circuits, filters are widely used in various electronic devices. In the fields of communication equipment, aerospace, shipboard equipment and other special needs, the electromagnetic environment has a wide frequency band and a strong field. All of these items put forward more stringent requirements: the shell of the traditional filter and the shielded shell of the connected equipment are independent of each other, and the filter and the shell of the equipment cannot be used in combination and complementary use, while the shell of the filter and the shielded shell of the connected equipment are independent of each other. The wiring is still in the electromagnetic environment, and there is a possibility of introducing clutter again; and because the connectors used for the ...

AI Technical Summary

Problems solved by technology

In the fields of communication equipment, aerospace, shipboard equipment and other special needs, the electromagnetic environment has a wide frequency band and a strong field. All of these items put forward more stringent requirements: the shell of the traditional filter and the shielded shell of the connected equipment are independent of each other, and the filter and the shell of the equipment cannot be used in combination and complementary use, while the shell of the filter and the shielded shell of the connected equipment are independent of each other. The wiring is still in the electromagnetic environment, and there is a possibility of introducing clutter again; and because the connectors used for the input and output connectors of the filter cannot be bent and routed like cables, the space above, below, left, and right of the connectors has not been effectively utilized , the actual occupied space is relatively large, and the space utilization rate is not high; in addition, for the filter components including the power filter, the traditional power filter does not have the abnormal state protection function. When the input voltage increases or the positive and negative poles of the input are switched, the traditional power filter can only filter out the clutter in the input voltage, but cannot protect the subsequent load; if a diode is used in series with the input of the power filter The input anti-reverse function can be achieved in the output path, but the diode in series has a fixed voltage drop in the circuit itself, and when the current passing through the filter is large, a large power consumption will be generated on the diode; therefore, how to do Finding a low-power filter component with high space utilization, good electromagnetic compatibility, and protection functions has become our challenge

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