CN210490807U

CN210490807U - EMP signal filter

Info

Publication number: CN210490807U
Application number: CN201921406513.7U
Authority: CN
Inventors: 仲晶; 曹文伟; 潘云飞; 张鹏飞; 卢小江
Original assignee: Jiangsu Wemc Technology Co ltd
Current assignee: Jiangsu wamuke Electronic Technology Co., Ltd
Priority date: 2019-08-27
Filing date: 2019-08-27
Publication date: 2020-05-08
Anticipated expiration: 2029-08-27

Abstract

The utility model relates to the technical field of filters, in particular to an EMP signal filter, which comprises a side clapboard, a filter cavity and an inlet wire cover plate, wherein the side clapboard is provided with a feedthrough capacitor; the filter cavity is divided into an inlet wire end cavity, an outlet wire end cavity and a main cavity, the inlet wire end cavity is matched with the inlet wire cover plate, the outlet wire end cavity is directly welded by tin soldering, a lead is led out, a surge protector is arranged in the inlet wire end cavity and is connected in parallel with a feedthrough capacitor on the side partition plate, and one end of a surge protector pin is directly grounded; a bypass capacitor and an inductance coil are arranged in the main cavity body, the bypass capacitor is connected with the feedthrough capacitor in parallel, and the inductance coil is connected with the feedthrough capacitor and the bypass capacitor. The utility model discloses have both functions of signal filtering and anti-electromagnetic pulse concurrently, simple structure, simple to operate, it is effectual to prevent electromagnetic pulse, can extensively be used for multiple fields such as electromagnetism electric power system, electronic equipment, microchip, effectively protects the safe handling of foretell equipment.

Description

EMP signal filter

Technical Field

The invention relates to the technical field of filters, in particular to an EMP signal filter.

Background

Electromagnetic pulse (EMP) is a physical phenomenon that is mainly used to destroy enemy electronic equipment. The electromagnetic pulse, which typically lasts only one second for the longest time, is a burst, high intensity pulse of broadband electromagnetic radiation. Any unprotected electrical appliance and any object connected to the electric wire, such as an electromagnetic pulse system of a power system, electronic equipment, a microchip and the like, can be damaged irreparably due to the influence of electromagnetic pulses, and the electromagnetic pulses can cause drastic changes of atmospheric charge density, so that various wave bands below ultrahigh frequency generate interference, and communication is temporarily blocked.

The signal filter is a filter circuit consisting of a capacitor, an inductor and a resistor, and is a passive bidirectional network, wherein one end of the passive bidirectional network is a signal, and the other end of the passive bidirectional network is a load. The principle of the signal filter is an impedance adaptation network, wherein the more impedance adaptation of the input side and the output side of the signal filter to the power supply side and the load side is, the more effective the attenuation of electromagnetic interference is. The filter can effectively filter the frequency point of the specific frequency in the signal line or the frequencies except the frequency point to obtain a signal of the specific frequency or eliminate the signal of the specific frequency. The main function of the signal line filter is to solve the problem of spatial electromagnetic interference, such as the problem that the equipment radiates strong electromagnetic interference to the space, or the problem that the equipment is sensitive to the electromagnetic interference of the space.

Currently, all the modules are single-function EMP protection modules or signal filters in the market, and how to develop a filter having both signal filtering and electromagnetic pulse preventing functions is one of the important directions for the research in the technical field of filters.

Disclosure of Invention

In order to overcome the problem of single function of an EMP protection module or a signal filter in the prior art, the invention provides a filter which has both signal filtering and electromagnetic pulse preventing functions, and in order to achieve the purpose, the specific technical scheme of the invention is as follows: an EMP signal filter comprises a side partition plate, a filter cavity and an incoming line cover plate, wherein a feedthrough capacitor is arranged on the side partition plate; the filter cavity is divided into an incoming line end cavity, an outgoing line end cavity and a main cavity, the incoming line end cavity is matched with an incoming line cover plate, the outgoing line end cavity is directly welded by tin soldering, a lead is led out, a surge protector is arranged in the incoming line end cavity, the surge protector is connected with a feedthrough capacitor on a side partition plate in parallel, and one end of a pin of the surge protector is directly grounded; the main cavity is internally provided with a bypass capacitor and an inductance coil, the bypass capacitor is connected with the feedthrough capacitor in parallel, and the inductance coil is connected with the feedthrough capacitor and the bypass capacitor.

Furthermore, an insulating washer is padded between the surge protector and the feedthrough capacitor, and the size of the insulating washer is matched with the size of the surge protector and the size of the feedthrough capacitor.

Further, the voltage dependent resistor in the surge protector is matched with the rated voltage of the filter, and the voltage of the voltage dependent resistor is close to or higher than the rated voltage of the filter.

Furthermore, the surge protector is welded by adopting a PCB (printed circuit board), namely, the piezoresistor is directly soldered on the PCB, and the PCB replaces a lead for connection.

Furthermore, the surge protector of the surge protector does not adopt a lead wire, but directly fixes a corresponding screw rod of a live wire (a zero wire) on a PCB (printed circuit board) of the surge protector.

Furthermore, an inductance coil or a feedthrough capacitor in the invention forms primary filtering, and capacitance inductors in the main cavity body are alternately arranged in sequence to form multi-stage filtering.

The EMP signal filter has both the functions of signal filtering and electromagnetic pulse prevention, has a simple structure, is convenient to install, has a good electromagnetic pulse prevention effect, can be widely applied to various fields of electromagnetic power systems, electronic equipment, microchips and the like, and effectively protects the safe use of the equipment.

Drawings

FIG. 1 is a first schematic structural diagram of the present invention;

FIG. 2 is a second schematic structural view of the present invention;

FIG. 3 is a circuit diagram of the present invention.

FIG. 4 is a schematic diagram of the capacitance-inductance progression of the present invention;

fig. 5 is a schematic view of the installation of the present invention.

Detailed Description

The technical solution of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in the schematic structural diagrams of fig. 1 and fig. 2, the present invention is an EMP signal filter, which includes a side partition plate, a filter cavity, and an incoming line cover plate, wherein a feedthrough capacitor is disposed on the side partition plate; the filter cavity is divided into an incoming line end cavity, an outgoing line end cavity and a main cavity, the incoming line end cavity is matched with the incoming line cover plate, the outgoing line end cavity is directly led out by a lead, soldering and sealing welding are carried out, a surge protector is arranged in the incoming line end cavity and is connected in series with a feedthrough capacitor on the side partition plate, and one end of the surge protector is directly grounded; a bypass capacitor and an inductance coil are arranged in the main cavity body, the bypass capacitor is connected with the feedthrough capacitor in parallel, and the inductance coil is connected with the feedthrough capacitor and the bypass capacitor. An insulating gasket is padded between the surge protector and the feedthrough capacitor, and the size of the insulating gasket is matched with that of the surge protector and the feedthrough capacitor. Furthermore, an insulating washer is padded between the surge protector and the feedthrough capacitor, and the size of the insulating washer is matched with the size of the surge protector and the size of the feedthrough capacitor.

As the preferred embodiment of the invention, the surge protector adopts the welding of the PCB circuit board, namely the piezoresistor is directly soldered on the PCB circuit board, and the PCB circuit board is used for replacing the lead for connection. The surge protector does not adopt a lead wire, but directly fixes a corresponding screw rod of a corresponding live wire (zero line) on a PCB (printed circuit board) of the surge protector.

As shown in the circuit diagram of the present invention in fig. 3, the feedthrough capacitor C1 of the present invention has one end connected to the live wire (neutral wire) and the other end directly connected to the ground; the bypass capacitor C2 of the present invention is directly connected between the zero line to ground (N-G) and the fire line to ground(L-G); surge protector R of the invention_LThe device is provided with three connecting points, one end of the connecting point is connected with a live wire (or a zero line), and the other end of the connecting point is directly grounded; as a preferred embodiment of the present invention, the voltage dependent resistor in the surge protector of the present invention is matched with the rated voltage of the filter, and the voltage of the voltage dependent resistor is close to or higher than the rated voltage of the filter. For example, when the rated voltage of the filter is 24V, the voltage level of the piezoresistor can be set to be less than 40V and greater than 24V, so that the protection voltage of the piezoresistor is as close as possible but slightly higher than the rated voltage, and the piezoresistor can rapidly act as possible to protect the rear-end filter.

In the invention, one inductance coil or a feedthrough capacitor forms primary filtering, and capacitance inductors in a main cavity of the filter are alternately arranged in sequence to form multi-stage filtering. As shown in fig. 4, a capacitor and an inductor in a dashed square frame form two-stage filtering, and multiple stages of filtering can be set in the main cavity according to actual conditions. The electromagnetic pulse resistance of the filter can be improved by increasing the stage number of the filter.

As shown in fig. 5, when the EMP signal filter of the present invention is fixed on a shielding plate or a wall surface of a dark room, the housing is connected to the wall surface through a waveguide screw, and a wire mesh gasket is added between the housing and the wall surface to prevent interference signals from directly penetrating through the wall surface.

Claims

1. An EMP signal filter is characterized by comprising a side partition plate, a filter cavity and an incoming line cover plate, wherein a feedthrough capacitor is arranged on the side partition plate; the filter cavity is divided into an inlet wire end cavity, an outlet wire end cavity and a main cavity, the inlet wire end cavity is matched with the inlet wire cover plate, the outlet wire end cavity is directly welded by tin soldering, and a lead is led out; a surge protector is arranged in the cavity of the wire inlet end, the surge protector is connected with the feedthrough capacitor on the side partition plate in parallel, and one end of a pin of the surge protector is directly grounded; the main cavity is internally provided with a bypass capacitor and an inductance coil, the bypass capacitor is connected with the feedthrough capacitor in parallel, and the inductance coil is connected with the feedthrough capacitor and the bypass capacitor.

2. The EMP signal filter of claim 1, wherein the surge protector and the feedthrough capacitor are padded with an insulating gasket, and the size of the insulating gasket is matched with the size of the surge protector and the feedthrough capacitor.

3. The EMP signal filter of claim 1, wherein the voltage dependent resistor in the surge protector is matched to a voltage rating of the filter, the voltage dependent resistor having a voltage near or above the voltage rating of the filter.

4. The EMP signal filter of claim 1, wherein the surge protector is soldered to the PCB by direct soldering of the varistor to the PCB instead of the wire connection.

5. The EMP signal filter of claim 1, wherein the surge protector does not employ a lead wire, but rather directly secures a corresponding screw of the line or neutral wire to a PCB circuit board of the surge protector.

6. The EMP signal filter of claim 1, wherein the one inductor or feedthrough capacitor forms a first stage of filtering, and the capacitor inductors in the main cavity are alternately arranged in sequence to form a plurality of stages of filtering.