CN205945671U

CN205945671U - Electromagnetic compatibility filter component

Info

Publication number: CN205945671U
Application number: CN201620914944.4U
Authority: CN
Inventors: 董俊峰; 耿利群; 何天成; 黄记堂; 杜大亨
Original assignee: CHONGQING DAYI ELECTRONIC TECHNOLOGY Co Ltd
Current assignee: CHONGQING DAYI ELECTRONIC TECHNOLOGY Co Ltd
Priority date: 2016-08-22
Filing date: 2016-08-22
Publication date: 2017-02-08
Anticipated expiration: 2026-08-22

Abstract

The utility model provides an electromagnetic compatibility filter component, an electromagnetic compatibility filter component contains screening can and wave filter, the screening can contains upper cover and bottom plate, be equipped with the recess that matches with the upper cover on the bottom plate, still contain the conductive rubber strip that matches with the big small -size of recess for fill the clearance between recess infrabasal plate and the upper cover, the wave filter contain power filter circuit and signal filtering circuit, power filter circuit contains voltage amplitude limiting protection circuit, signal filtering circuit contains a plurality of feedthrough capacitor, and all branch roads of signal filtering circuit are all through the filtering of feedthrough capacitor ground connection, the beneficial effects of the utility model are that the filtering performance is good, and possesses voltage voltage limiting protect function.

Description

A kind of electromagnetic compatibility filtering unit

Technical field

This utility model is related to field of electromagnetic compatibility and in particular to a kind of electromagnetic compatibility filtering unit.

Background technology

Electromagnetic compatibility filtering unit is in addition to including some wave filter in addition it is also necessary to there be good capability of electromagnetic shielding；Filter Ripple device, as the equipment filtering the noise signal in circuit, is widely used in various electronic equipments；Wave filter according to The different of filtering object can be divided into power-supply filter and traffic filter, in order to improve electromagnetic compatibility filter effect, Ren Menshe again Count numerous wave filter and constantly studied using straightforward procedure improvement capability of electromagnetic shielding；Chinese patent document CN203104377U proposes a kind of electromagnet Compatibility filter, and the scheme that it adopts has problems with：It is connected with output Part connect only with two-stage inductance, easily absorb external electromagnetism clutter it is difficult to filtering interfering in electric source filter circuit back segment, On the other hand, this electromagnetic compatibility wave filter lacks voltage limited amplitude protection function, when input voltage exceedes rated voltage with load, will Badly influence the use of back segment load；In addition, because assembling and shell problem can exist between the shell of usual filtering unit Gap, affects the shield effectiveness of whole shell it is therefore necessary to design a kind of new electromagnetic compatibility wave filter.

Utility model content

For the deficiency in the presence of prior art, this utility model provides a kind of good wave filtering effect, and there are electricity The electromagnetic compatibility wave filter of pressure limited amplitude protection.

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

A kind of electromagnetic compatibility filtering unit, comprises to shield shell and wave filter；It is provided with some on described shielding shell The corresponding connection of input adapter and out splice going splice, the input of input adapter, out splice going splice and wave filter and output；Shielding shell comprises Upper lid and base plate；Base plate is provided with the groove mating with upper lid；Also comprise the conductive rubber strip mating with groove size dimension, use Gap between filling groove inner bottom plating and upper lid；Described wave filter comprises electric source filter circuit and signal filter circuit； The input of electric source filter circuit and outfan comprise positive pole and negative pole respectively；From the input anode of electric source filter circuit to electricity The output head anode direction of power filter has been sequentially connected in series common mode inductance L1A, common mode inductance L2A and inductance L3；From power supply filter The input cathode of wave circuit has been sequentially connected in series common mode inductance L1B, common mode electricity to the negative pole of output end direction of electric source filter circuit Sense L2B and inductance L4；Common mode inductance L1A shares a magnetic respectively with common mode inductance L1B, common mode inductance L2A and common mode inductance L2B Ring；It is parallel with differential mode capacitor CX1 in the input of electric source filter circuit；The two ends of differential mode capacitor CX1 respectively with common mode inductance L1A And one end of common mode inductance L1B is connected, the other end of common mode inductance L1A and common mode inductance L1B respectively with differential mode capacitor CX2 two End is connected, and is connected with one end of common mode inductance L2A and common mode inductance L2B；Common mode inductance L2A's and common mode inductance L2B is another End is connected with the two ends of differential mode capacitor CX3 respectively；Common mode capacitance CY1 and common mode capacitance CY2, common mode capacitance CY3 and common mode capacitance CY4, common mode capacitance CY5 and common mode capacitance CY6 are connected in series respectively two-by-two, and connection end is all connected with ground, the common mode electricity of series connection Hold CY1 and common mode capacitance CY2 overall in parallel with differential mode capacitor CX2, common mode capacitance CY3 of series connection and common mode capacitance CY4 entirety and Differential mode capacitor CX3 is in parallel；Common mode capacitance CY5 of series connection is overall with common mode capacitance CY6 in parallel with the outfan of electric source filter circuit.

Further, also comprise voltage limiter protection circuit, described voltage limiter protection circuit and differential mode capacitor CX1, Differential mode capacitor CX2, differential mode capacitor CX3 one of them be in parallel.

Further, described voltage limiter protection circuit comprises bi-directional voltage stabilizing diode.

Further, described common mode capacitance CY5 and common mode capacitance CY6 are feedthrough capacitor.

Further, described signal filter circuit comprises some feedthrough capacitors, and all branch roads of signal filter circuit are equal Filtering is grounded by feedthrough capacitor.

This utility model uses conductive rubber strip to fill the gap between groove inner bottom plating and upper lid, on the one hand significantly reduces Gap between base plate and upper lid, on the other hand reduces the contact resistance between base plate and upper lid, thus improve filtering The capability of electromagnetic shielding of package shell；Differential mode-common mode multiple-stage filtering by interlaced arrangement in electric source filter circuit is so that whole The filter effect of body more preferably, and is not easily introduced new interference noise；When control source and exceedes setting voltage value in input, Then bi-directional voltage stabilizing diode by voltage stabilization in corresponding parameter value, to protect the normal use of back segment load；And signal filtering All branch roads of circuit are all filtered using feedthrough capacitor, and the stray inductance of feedthrough capacitor is much lower compared with conventional capacitive, filtering property Can be more preferably.

Brief description

Fig. 1 is the structure schematic front view of embodiment.

Fig. 2 is the structure schematic top plan view of embodiment.

Fig. 3 is the schematic diagram of electric source filter circuit in embodiment.

Fig. 4 is the wiring schematic diagram of signal filter circuit in embodiment.

Specific embodiment

Below in conjunction with the accompanying drawings and embodiment further illustrates to the technical scheme in this utility model.

A kind of electromagnetic compatibility filtering unit, comprises to shield shell and wave filter；As shown in Figure 1 and Figure 2, outside described shielding Some input adapters 1 and out splice going splice 2 are provided with shell, input adapter 1, out splice going splice 2 are right with the input of wave filter and output Should connect；Shielding shell comprises lid 3 and base plate 4；Base plate 4 is provided with the groove mating with upper lid 3；Electromagnetic compatibility filtering unit Also comprise the conductive rubber strip 5 mating with groove size dimension, for filling the gap between groove inner bottom plating 4 and upper lid 3；Institute The wave filter stated comprises electric source filter circuit and signal filter circuit；As shown in figure 3, the input PN of electric source filter circuit and defeated Go out to hold p ' n ' to comprise positive pole and negative pole respectively；Proper to the output of electric source filter circuit from the input anode of electric source filter circuit Extreme direction has been sequentially connected in series common mode inductance L1A, common mode inductance L2A and inductance L3；From the input cathode of electric source filter circuit to The negative pole of output end direction of electric source filter circuit has been sequentially connected in series common mode inductance L1B, common mode inductance L2B and inductance L4；Common mode electricity Sense L1A shares a magnet ring respectively with common mode inductance L1B, common mode inductance L2A and common mode inductance L2B；In electric source filter circuit Input is parallel with differential mode capacitor CX1；The two ends of differential mode capacitor CX1 one end with common mode inductance L1A and common mode inductance L1B respectively It is connected, the other end of common mode inductance L1A and common mode inductance L1B is connected with the two ends of differential mode capacitor CX2 respectively, and and common mode inductance One end of L2A and common mode inductance L2B is connected；The other end of common mode inductance L2A and common mode inductance L2B respectively with differential mode capacitor CX3 Two ends be connected；Common mode capacitance CY1 is with common mode capacitance CY2, common mode capacitance CY3 and common mode capacitance CY4, common mode capacitance CY5 together Mould electric capacity CY6 is connected in series respectively two-by-two, and connection end is all connected with ground, and common mode capacitance CY1 of series connection is whole with common mode capacitance CY2 Body is in parallel with differential mode capacitor CX2, and common mode capacitance CY3 of series connection is overall with common mode capacitance CY4 in parallel with differential mode capacitor CX3；Series connection Common mode capacitance CY5 and common mode capacitance CY6 overall in parallel with the outfan of electric source filter circuit.

Also comprise voltage limiter protection circuit, described voltage limiter protection circuit is bi-directional voltage stabilizing diode D, with differential mode Electric capacity CX2 is in parallel.

Described common mode capacitance CY5 and common mode capacitance CY6 are feedthrough capacitor, do not have high-frequency coupling, and grounded inductor is less, Achieve more preferable filter effect in electric source filter circuit outfan.

Described signal filter circuit comprises some feedthrough capacitors, and all branch roads of signal filter circuit are all by punching electricity Hold ground connection filtering, Fig. 4 is the wiring schematic diagram of the one of terminal of signal filter circuit.

The present embodiment uses conductive rubber strip to fill the gap between groove inner bottom plating and upper lid, on the one hand greatly reduces Gap between base plate and upper lid, on the other hand reduces the contact resistance between base plate and upper lid, thus improve filtering group The capability of electromagnetic shielding of part shell；Differential mode-common mode multiple-stage filtering by interlaced arrangement in electric source filter circuit is so that entirety Filter effect more preferably, and be not easily introduced new interference noise；When input control source and exceedes setting voltage value, then Bi-directional voltage stabilizing diode by voltage stabilization in corresponding parameter value, to protect the normal use of back segment load；And signal filtering is electric All branch roads on road are all filtered using feedthrough capacitor, and the stray inductance of feedthrough capacitor is much lower compared with conventional capacitive, filtering performance More preferably.

Finally illustrate, above example only in order to the technical solution of the utility model to be described and unrestricted, although ginseng According to preferred embodiment, this utility model is described in detail, it will be understood by those within the art that, can be to this The technical scheme of utility model is modified or equivalent, the objective without deviating from technical solutions of the utility model and model Enclose, it all should be covered in the middle of right of the present utility model.

Claims

1. a kind of electromagnetic compatibility filtering unit, comprises to shield shell and wave filter；It is provided with some defeated on described shielding shell Enter joint and out splice going splice, the input of input adapter, out splice going splice and wave filter and the corresponding connection of output；Shielding shell comprises Lid and base plate；It is characterized in that：Base plate is provided with the groove mating with upper lid；Also comprise the conduction mated with groove size dimension Rubber strip, for filling the gap between groove inner bottom plating and upper lid；Described wave filter comprises electric source filter circuit and signal Filter circuit；The input of electric source filter circuit and outfan comprise positive pole and negative pole respectively；Input from electric source filter circuit The output head anode direction of proper best electric source filter circuit has been sequentially connected in series common mode inductance L1A, common mode inductance L2A and inductance L3；It has been sequentially connected in series common mode inductance from the input cathode of electric source filter circuit to the negative pole of output end direction of electric source filter circuit L1B, common mode inductance L2B and inductance L4；Common mode inductance L1A and common mode inductance L1B, common mode inductance L2A and common mode inductance L2B difference Share a magnet ring；It is parallel with differential mode capacitor CX1 in the input of electric source filter circuit；The two ends of differential mode capacitor CX1 respectively with One end of common mode inductance L1A and common mode inductance L1B is connected, the other end of common mode inductance L1A and common mode inductance L1B respectively with differential mode The two ends of electric capacity CX2 are connected, and are connected with one end of common mode inductance L2A and common mode inductance L2B；Common mode inductance L2A and common mode electricity The other end of sense L2B is connected with the two ends of differential mode capacitor CX3 respectively；Common mode capacitance CY1 and common mode capacitance CY2, common mode capacitance CY3 It is connected in series two-by-two respectively with common mode capacitance CY4, common mode capacitance CY5 and common mode capacitance CY6, and connection end is all connected with ground, string Common mode capacitance CY1 and common mode capacitance CY2 of connection is integrally in parallel with differential mode capacitor CX2, common mode capacitance CY3 of series connection and common mode capacitance CY4 is overall in parallel with differential mode capacitor CX3；Common mode capacitance CY5 of series connection is overall with common mode capacitance CY6 defeated with electric source filter circuit Go out end in parallel.

2. a kind of electromagnetic compatibility filtering unit according to claim 1 it is characterised in that：Also comprise voltage limited amplitude protection electricity Road, described voltage limiter protection circuit and differential mode capacitor CX1, differential mode capacitor CX2, differential mode capacitor CX3 one of mutually simultaneously Connection.

3. a kind of electromagnetic compatibility filtering unit according to claim 2 it is characterised in that：Described voltage limited amplitude protection electricity Road comprises bi-directional voltage stabilizing diode.

4. a kind of electromagnetic compatibility filtering unit according to claim 1 or 3 it is characterised in that：Described common mode capacitance CY5 And common mode capacitance CY6 is feedthrough capacitor.

5. a kind of electromagnetic compatibility filtering unit according to claim 4 it is characterised in that：Described signal filter circuit bag Containing some feedthrough capacitors, all branch roads of signal filter circuit are all grounded filtering by feedthrough capacitor.