CN206041792U

CN206041792U - EMI filter

Info

Publication number: CN206041792U
Application number: CN201620947267.6U
Authority: CN
Inventors: 唐异茂
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-08-25
Filing date: 2016-08-25
Publication date: 2017-03-22
Anticipated expiration: 2026-08-25

Abstract

The utility model discloses a EMI filter, including the wave filter body, the wave filter body comprises casing, apron, hinge, input port, output port, circuit board, diode, electric capacity, choke coil, silica gel, the wave filter body sets up the casing, and the wave filter body sets up input port and output port, the top of casing sets up the apron, and the tip of apron sets up the hinge, the inside circuit board that sets up of wave filter body, be equipped with electric capacity and choke coil on the circuit board, the input port and the output port department of wave filter body all set up the diode, the utility model discloses simple structure, convenient to use not only is applicable to the drive and the circumstances that the impedance difference is very big of load, still is applicable to to drive and the impedance of load impedance very high and required circumstances that decay progression is very high all of very low and drive and load all, in addition the utility model discloses the radiating effect is good, is difficult to damage long service life, low price, safe and reliable.

Description

A kind of electromagnetic interface filter

Technical field

This utility model is related to wave filter, specifically a kind of electromagnetic interface filter.

Background technology

It is passive that EMI power-supply filters are substantially made up of series inductance, shunt capacitance and necessary series and parallel compensated resistance Low pass filter, the special high-frequency noise for filtering off more than 150kHz, its operation principle is exactly the high frequency characteristics using inductance, electric capacity The energy expenditure of high-frequency interferencing signal is fallen, make these interference signals as little as possible enter electronic equipment, and make power frequency component and Direct current signal zero-decrement in the least can pass through.

Existing electromagnetic interface filter single function, and radiating effect is bad, and the electric elements for easily causing inside are damaged, And the effect of wave filter is relevant with the network impedance of connection, the wave filter of the single electric capacity of existing electromagnetic interface filter is in high impedance In circuit effect very well, and in low impedance circuit poor effect.

Utility model content

The purpose of this utility model is to provide a kind of electromagnetic interface filter, to solve the problems, such as to propose in above-mentioned background technology.

For achieving the above object, this utility model provides following technical scheme：

A kind of electromagnetic interface filter, including filtering body, the filtering body mainly by housing, cover plate, hinge, dissipate Hot hole, input port, output port, circuit board, pin, fixture, diode, electric capacity, choke coil, silica gel, controlling switch structure Into；The filtering body arranges housing, and the housing is made of Heat Conduction Material, filtering body setting input port and output Port, the input port and output port are fixedly connected with the outer wall of housing, and the top of the housing arranges cover plate, cover plate End arranges hinge, is connected through the hinge, arranges circuit board inside the filtering body between the cover plate and housing, described Circuit board is fixedly connected with filtering body inwall, and the circuit board is provided with electric capacity and choke coil, and full range signal is by entering Input port, is tentatively suppressed to interference signal by the electric capacity of input port, then through the reflection of choke coil, absorb and Shielding isolation, is further suppressed to interference signal, interference signal is carried out finally finally by the electric capacity of output port The suppression of one step, all arranges diode at the input port and output port of the filtering body, prevents electricity by diode There is backward voltage and equipment is caused to damage in road.

As further program of the utility model：The electric elements of the filtering body are welded on circuit boards, institute State, radiating treatment is carried out to electric elements by heat conductive silica gel.

As this utility model further scheme：Louvre is uniformly arranged on the cover plate, helps filtering body Steel wire is set in internal heat dissipating, the louvre, prevents foreign body from entering inside filtering body.

As this utility model further scheme：The bottom of the circuit board arranges silica gel, by silica gel to circuit Electric elements on plate and circuit board are radiated.

As this utility model further scheme：The two ends of the circuit board arrange pin, the pin and circuit By being welded to connect between plate, pin is set inside filtering body, the pin passes through to fix with the inwall of filtering body Part is fixedly connected.

As this utility model further scheme：The filtering body arranges L-type, T-shaped and three kinds of filtering of ∏ types Circuit；L-type circuit is applied to the very big situation of the impedance difference for driving and loading；Inductance element should be connected with minimum impedance Connect；T-shaped circuit is respectively to add an inductance electric capacity both sides, it is adaptable to all very low situation of driving and the impedance for loading；∏ Type circuit is made up of around an inductance two electric capacity, it is adaptable to all very high and required attenuation grade of driving and the impedance for loading The very high situation of number.

As this utility model further scheme：The input of the filter circuit arranges controlling switch, by control System switch is adjusted to filter circuit.

Compared with prior art, the beneficial effects of the utility model are：This utility model simple structure, and user Just, the very big situation of the impedance difference that drives and load is applicable not only to, the impedance for applying also for driving and loading is all very low The very high situation of all very high and required attenuation level of the impedance of situation and driving and load, and this utility model radiating effect Really good, it is not easy to damage, long service life, low price are safe and reliable.

Description of the drawings

Structural representations of the Fig. 1 for electromagnetic interface filter.

Circuit diagrams of the Fig. 2 for electromagnetic interface filter.

In figure：1- housings, 2- cover plates, 3- hinges, 4- louvres, 5- input ports, 6- output ports, 7- circuit boards, 8- Pin, 9- fixtures, 10- diodes, 11- electric capacity, 12- choke coils, 13- silica gel, 14- controlling switches.

Specific embodiment

The technical scheme of this patent is described in more detail with reference to specific embodiment.

Refer to Fig. 1-2, a kind of electromagnetic interface filter, including filtering body, the filtering body mainly by housing 1, Cover plate 2, hinge 3, louvre 4, input port 5, output port 6, circuit board 7, pin 8, fixture 9, diode 10, electric capacity 11st, choke coil 12, silica gel 13, controlling switch 14 are constituted；The filtering body arranges housing 1, and the housing 1 is Heat Conduction Material Make, filtering body arranges the outer wall of input port 5 and output port 6, the input port 5 and output port 6 and housing 1 It is fixedly connected, the top of the housing 1 arranges cover plate 2, and the end of cover plate 2 arranges hinge 3, leads between the cover plate 2 and housing 1 Cross hinge 3 to connect, circuit board 7 is set inside the filtering body, the circuit board 7 is fixed with filtering body inwall and connected Connect, the circuit board 7 is provided with electric capacity 11 and choke coil 12, full range signal by into input port 5, by input port 5 Electric capacity 11 interference signal is tentatively suppressed, then through the reflection of choke coil 12, absorb and shield isolation, to interference letter Number further suppressed, the suppression of final step is carried out to interference signal finally by the electric capacity 12 of output port 6, it is described Diode 10 is all set at the input port 5 and output port 6 of filtering body, prevents circuit from occurring by diode 10 reverse Voltage causes to damage to equipment.

Operation principle of the present utility model is：The electric elements of the filtering body are welded on circuit board 7, the weldering Seam is provided with heat conductive silica gel, carries out radiating treatment by heat conductive silica gel to electric elements.

Louvre 4 is uniformly arranged on the cover plate 3, filtering body internal heat dissipating is helped, and steel is set in the louvre 4 Silk screen, prevents foreign body from entering inside filtering body.

The bottom of the circuit board 7 arranges silica gel 13, by silica gel 13 to the electric elements on circuit board 7 and circuit board 7 Radiated.

The two ends of the circuit board 7 arrange pin 8, by being welded to connect between the pin 8 and circuit board 7, wave filter Body interior arranges pin 8, and the pin 8 is fixedly connected by fixture 9 with the inwall of filtering body.

The filtering body arranges L-type, T-shaped and three kinds of filter circuits of ∏ types；L-type circuit is applied to what is driven and load The very big situation of impedance difference；Inductance element should be connected with minimum impedance；T-shaped circuit is respectively to add one electric capacity both sides Individual inductance, it is adaptable to all very low situation of driving and the impedance for loading；∏ types circuit is made up of around an inductance two electric capacity , it is adaptable to the very high situation of all very high and required attenuation level of driving and the impedance for loading；The input of the filter circuit End arranges controlling switch 14, filter circuit is adjusted by controlling switch.

Above the better embodiment of this patent is explained in detail, but this patent is not limited to above-mentioned embodiment party Formula, in the ken that one skilled in the relevant art possesses, can be with the premise of without departing from this patent objective Make a variety of changes.

Claims

1. a kind of electromagnetic interface filter, including filtering body, the filtering body is mainly by housing, cover plate, hinge, radiating Hole, input port, output port, circuit board, pin, fixture, diode, electric capacity, choke coil, silica gel, controlling switch are constituted； The filtering body arranges housing, and the housing is made of Heat Conduction Material, filtering body setting input port and outfan Mouth, the input port and output port are fixedly connected with the outer wall of housing, and the top of the housing arranges cover plate, and its feature exists In the end of cover plate arranges hinge, is connected through the hinge between the cover plate and housing, arranges electricity inside the filtering body Road plate, the circuit board are fixedly connected with filtering body inwall, and the circuit board is provided with electric capacity and choke coil, the filtering At the input port and output port of device body, diode is all set.

2. electromagnetic interface filter according to claim 1, it is characterised in that the electric elements of the filtering body are welded on On circuit board, at the soldering opening, heat conductive silica gel is provided with.

3. electromagnetic interface filter according to claim 1, it is characterised in that be uniformly arranged louvre on the cover plate, help filter Ripple device body interior radiates, and arranges steel wire in the louvre.

4. electromagnetic interface filter according to claim 1, it is characterised in that the bottom of the circuit board arranges silica gel.

5. electromagnetic interface filter according to claim 1, it is characterised in that the two ends of the circuit board arrange pin, described to draw By being welded to connect between foot and circuit board, the inwall of pin, the pin and filtering body is set inside filtering body It is fixedly connected by fixture.

6. electromagnetic interface filter according to claim 1, it is characterised in that the filtering body arranges L-type, T-shaped and ∏ types Three kinds of filter circuits.

7. electromagnetic interface filter according to claim 6, it is characterised in that the input of the filter circuit arranges control and opens Close.