CN210405239U

CN210405239U - EMP power filter

Info

Publication number: CN210405239U
Application number: CN201921406767.9U
Authority: CN
Inventors: 张鹏飞; 曹文伟; 潘云飞; 仲晶; 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: 2020-04-24
Anticipated expiration: 2029-08-27

Abstract

The utility model belongs to the field of filters, in particular to an EMP power filter, which comprises a side baffle plate, a filter cavity, an incoming line cover plate and an outgoing line cover plate, wherein the filter cavity is divided into an incoming line end cavity, an outgoing line end cavity and a main cavity, and a waveguide bolt is arranged in the outgoing line end cavity; the surge protector is arranged in the cavity of the wire inlet end and is connected in parallel with the feedthrough capacitor on the side clapboard, and the surge protector is of a lead wire leading-out structure; the main cavity is internally provided with an inductor which is respectively connected with the feedthrough capacitors on the side partition plates in series, one inductor or feedthrough capacitor forms one-stage filtering, the capacitors and inductors in the main cavity are sequentially and alternately placed to form multi-stage filtering, and the number of the capacitor and inductor stages is 2-9. The utility model discloses with power filtering and anti-electromagnetic pulse two function synthesis, not only can the power supply interference signal of filtering power class equipment front end, also promoted the anti-electromagnetic pulse's of whole equipment or system ability.

Description

EMP power filter

Technical Field

The invention belongs to the field of filters, and particularly relates to an EMP power supply filter.

Background

An electromagnetic pulse (EMP) is a burst electromagnetic radiation high-intensity pulse with a broadband spectrum, the frequency range covered by the EMP can be from several megahertz to several hundred gigahertz, and a conventional electromagnetic compatibility power supply filter is difficult to meet the high-performance working requirement under the environment.

The power 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 power supply, and the other end of the passive bidirectional network is a load. The power filter is an impedance adaptation network, and the more impedance adaptation of the input side and the output side of the power filter to the power supply 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 power line or the frequencies except the frequency point to obtain a power signal of the specific frequency or eliminate the power signal of the specific frequency. The power supply filter on the market at present has single function and complex structure, and can not effectively filter the power supply interference signal at the front end of the power supply equipment.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides an EMP power filter, which combines the functions of power filtering and electromagnetic pulse resistance, can filter power interference signals at the front end of power equipment, and improves the electromagnetic pulse resistance of the whole equipment or system.

In order to achieve the above object, the technical solution of the present invention is as follows: an EMP power filter comprises a side partition plate, a filter cavity, an incoming line cover plate and an outgoing line cover plate, wherein the filter cavity is divided into an incoming line end cavity, an outgoing line end cavity and a main cavity; the surge protector is arranged in the cavity of the wire inlet end and is connected in parallel with the feedthrough capacitor on the side clapboard, and the surge protector is of a lead wire leading-out structure; the main cavity is internally provided with an inductor which is respectively connected with the feedthrough capacitors on the side partition plates in series, one inductor or feedthrough capacitor forms one-stage filtering, the capacitors and inductors in the main cavity are sequentially and alternately placed to form multi-stage filtering, and the number of the capacitor and inductor stages is 2-9.

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.

Furthermore, the diameter of the lead wire of the surge protector is 4mm²The above cable lines.

Further, the threshold value of the piezoresistor of the surge protector is close to or higher than the rated voltage of the electrical equipment needing filtering.

Further, the EMP power filter of the invention also comprises a fixing hole for fixing the EMP power filter on a shielding plate or a wall surface of a dark room through a waveguide screw rod in the using process.

Furthermore, the outgoing line cover plate is shielded by a wire mesh, so that the situation that the interior of the filter bin and the outgoing line end are in an electromagnetic sealing environment is ensured.

The invention combines the functions of power supply filtering and electromagnetic pulse resistance, can filter power supply interference signals at the front end of power supply equipment and also improves the capability of resisting electromagnetic pulse of the whole equipment or system.

Drawings

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

Fig. 2 is a second structural schematic diagram 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 according to 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 fig. 1 and 2, the invention relates to an EMP power filter, which comprises a side partition plate, a filter cavity, an incoming line cover plate and an outgoing line cover plate, wherein 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, and the outgoing line end cavity is matched with the outgoing line cover plate; the surge protector is arranged in the cavity of the wire inlet end and is connected in parallel with the feedthrough capacitor on the side clapboard, and the surge protector is of a lead wire leading-out structure; the main cavity is internally provided with an inductor which is respectively connected with the feedthrough capacitors on the side partition plates in series, one inductor or feedthrough capacitor forms one-stage filtering, the capacitors and inductors in the main cavity are sequentially and alternately placed to form multi-stage filtering, and the number of the capacitor and inductor stages is 2-9.

As the preferred embodiment of the invention, the surge protector and the feedthrough capacitor are padded with insulating washers, and the size of the insulating washers is matched with that of the surge protector and the feedthrough capacitor. The outlet cover plate is shielded by a silk screen, so that the filter bin and the outlet end are in an electromagnetic sealing environment.

As a preferred embodiment of the present invention, the EMP power filter further includes a fixing hole for fixing the EMP power filter to a shield plate or a wall surface of a dark room through a waveguide screw during use.

Fig. 3 is a schematic circuit diagram of the present invention, wherein C1 represents a feedthrough capacitor, one end of the feedthrough capacitor is connected to the live wire (or neutral wire), the live wire (or neutral wire) is pressed by a bolt, the other end is directly grounded, and the ground is connected to the side partition plate. L1 denotes an inductor, two feedthrough capacitors being connected in series with one inductor. RL represents surge protector, and has two pins, one end is connected with live wire (or zero line) by bolt crimping, and the other end is grounded. The RL is essentially a piezoresistor, when the equipment is in the operation process, the RL is equivalent to a resistor infinite resistor (namely an open circuit) at the moment, when short-time electromagnetic pulse waves influence the equipment, the resistor of the RL becomes very small (almost 0) to be in a conducting state, at the moment, a very large part of short-time pulse is directly grounded through the RL, namely, the electromagnetic pulse protection device filters most electromagnetic pulse signals, the remaining small part of electromagnetic signals are filtered through a filter, and the use requirement of the rear-connected equipment is met during output. Lead wire diameter of surge protector is 4mm²The above cable wire, as a preferred embodiment of the present invention, selects 4mm for the lead of the surge protector when the voltage of the electrical equipment to be filtered is below 63A²When the voltage of the electric equipment needing filtering is above 63A, the lead of the surge protector is selected to be 6mm²The cable of (2). The threshold value of the piezoresistor of the surge protector is close to or higher than the rated voltage of the electrical equipment needing filtering, the voltage of a fire line to the ground is 250V under the normal condition, the threshold value of the piezoresistor in the surge protector is selected from 220V and 450V, wherein 430V is the preferred embodiment of the threshold value of the piezoresistor in the surge protector.

Fig. 4 is a schematic diagram of the capacitor-inductor stage number of the present invention, in which the stage number formed by the inductor and the capacitor in a dashed box is two, and the filter performance can be significantly improved by increasing the filter stage number for the EMP power filter. The capacitance and inductance are alternately arranged in sequence to form multi-stage filtering, and the number of the capacitance and inductance in the invention is 2-9.

Fig. 5 is an installation diagram of the EMP power filter of the present invention, the EMP power filter of the present invention is fixed on a wall surface of a shielding plate or a dark room through a waveguide screw and a nut, a fixing hole and a bolt, and a wire mesh gasket is added between the waveguide screw and the nut, and between the fixing hole and the bolt, so as to prevent an interference signal from directly penetrating through the wall body.

Claims

1. An EMP power filter is characterized by comprising a side partition plate, a filter cavity, an incoming line cover plate and an outgoing line cover plate, wherein the filter cavity is divided into an incoming line end cavity, an outgoing line end cavity and a main cavity; a surge protector is arranged in the cavity of the wire inlet end and is connected in parallel with the feedthrough capacitor on the side partition plate, and the surge protector is of a lead wire leading-out structure; the inductor is arranged in the main cavity, the inductors are respectively connected with the feedthrough capacitors on the side partition plates in series, one inductor or feedthrough capacitor forms one-stage filtering, the capacitor inductors in the main cavity are sequentially and alternately arranged to form multi-stage filtering, and the number of the capacitor inductors is 2-9.

2. The EMP power 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 power filter of claim 1, wherein a lead wire diameter of the surge protector is 4mm²The above cable lines.

4. The EMP power filter of claim 1, wherein a threshold of a varistor of the surge protector is near or above a voltage rating of an electrical device requiring filtering.

5. The EMP power filter of claim 1, further comprising a fixing hole for fixing the EMP power filter to a shield plate or a wall surface of a dark room through a waveguide screw in use.

6. The EMP power filter of claim 1, wherein the outlet cover plate is wire mesh shielded to ensure that the interior of the filter chamber and the outlet end are in an electromagnetically sealed environment.