CN203759138U - Common mode current noise magnetic field detection device - Google Patents
Common mode current noise magnetic field detection device Download PDFInfo
- Publication number
- CN203759138U CN203759138U CN201420166494.6U CN201420166494U CN203759138U CN 203759138 U CN203759138 U CN 203759138U CN 201420166494 U CN201420166494 U CN 201420166494U CN 203759138 U CN203759138 U CN 203759138U
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- mode current
- common mode
- current noise
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Abstract
The utility model provides a common mode current noise magnetic field detection device comprising a metal surface, a second metal layer, a third metal layer, a metal bottom layer and medium isolating layers arranged among the metal layers, in stacked and combined manners. A testing bottom plate is formed by a plurality of metal pins which are tightened integrally and which are distributed evenly along the straight lines of the periphery, two perpendicular coaxial cables are mounted on the testing bottom plate, and different metal wires or metal guide wires are respectively arranged on the metal surface, the second metal layer, the third metal layer and the metal bottom layer. According to the device, magnetic field noises of equipment to be detected can be inverted into current through electromagnetic induction, then the current is transmitted to measuring equipment through coaxial lines connected to the coaxial cables, background electromagnetic noises can be shielded and the differential mode current magnetic field of differential lines can be suppressed entirely, and testing effect can be improved.
Description
Technical field
The utility model relates to a kind of current noise sniffer, specifically a kind of common mode current noise field detecting device.
Background technology
Electromagnetic compatibility (EMC) refers to that electric and electronic equipment can carry out the coexisting state of function separately in common electromagnetic environment, requires the above-mentioned various device in same electromagnetic environment normally to work and not interfere with each other, and reaches compatible state.Along with various electronic equipments, photoelectricity, computing machine, being widely used of communication and information processing kind equipment, the electromagnetic environment of its application is become increasingly complex, thereby more and more higher to various EMC Requirements electric and electronic equipment, one of integral important indicator while paying that these Electro Magnetic Compatibilities electric and electronic equipment have become product, such as CISPR(CISPR) clearly definition in 22, within the scope of 230MHz-1000MHz, CLASS(grade) radiation field intensity of equipment of A must be less than 57dBuV/m (dBuV is the magnitude of voltage representing with decibels, dBuV/m is every meter of corresponding magnitude of voltage).
Along with the development of the communication technology, it is very high that the device in contemporary electronic systems and high speed are walked line density, the very high trend that become of working frequency of chip.This development trend is had higher requirement to the EMC performance design of electronic product.The shield effectiveness of electronic product casing and the frequency relation that is inversely proportional to, frequency is higher, and electronic product casing shield effectiveness is lower, and therefore, the high frequency E MC performance of electronic product has become the bottleneck of electronic product.
In product development process, EMC pretest is important means of testing in the development and production of whole product, can check in time the EMC design of product whether reasonable, the EMI(electromagnetic interference (EMI) of taking) whether braking measure prove effective, and designer is understood as early as possible and will further suppress to disturb and need to start with from which link.Therefore, exploitation one is applicable to various electric and electronic equipment internal electromagnetic environment assessment tests, and the probe apparatus that can detect electromagnetic field of high frequency radiation-emitting (1GH-18GHz) index is necessary.
Summary of the invention
The purpose of this utility model is to provide a kind of common mode current noise field detecting device, can overcome the frequency probe existing in prior art narrow, cannot distinguish common mode current noise and ground unrest and suppress the problems such as difference, there is highly sensitive, effective feature.
The utility model comprises concentric cable, the technical scheme adopting is: by two layers, metal surface and metal, three layers, metal, metal back layer and between arrange buffer layer stack combinations, and lock test base plate of solid one formation by its surrounding along the equally distributed multiple metal shaft of straight line, on test base plate, two vertical concentric cable arranged side by side are housed, the concentric cable upper end that fills is provided with joint, lower end is welded on inner core on the wire head of two layers, metal through metal surface, on metal surface and two layers, metal and three layers, metal and metal back layer, be respectively arranged with different metal routings or plain conductor.
In technique scheme: the set metal routing of metal surface is along surrounding inner edge cycle arrangement, middle part is each two concentric cable both sides forms " several " shape structure of relatively arranging.
Metal routing on two layers, metal arranges along surrounding inner edge ring-type, has a serpentine plain conductor in metal routing, and two terminations in the middle of plain conductor is bent to are wire heads of welding inner core.
On three layers, metal, be provided with the annular metal cabling along surrounding inner edge, there is the metal routing of " I " font centre.
On metal back layer, there is a loop metal routing along surrounding inner edge.
Described concentric cable is the half steel concentric cable of 50 ohm of impedances.
The utility model is compared with traditional magnet field probe technology, there is following significant advantage effect: owing to adopting several piece derby layer to be fastenedly connected by the multiple pivot pins of surrounding, can form the shield effectiveness that surrounding is metallic object, different metal routings and plain conductor are set respectively in addition, the device frequency band range forming can reach 10GH, can test separately the noise of common mode current, solve the problem that magnet field probe in prior art is easily subject to background electromagnetic noise interference, there is shield effectiveness good, can effectively resist background electromagnetic noise, guarantee to test the feature such as true of effect.
Brief description of the drawings
Below in conjunction with drawings and Examples, the utility model is described in further detail.
Fig. 1 is the utility model structural representation.
Fig. 2 is the utility model metal two-layer structure schematic diagram.
Fig. 3 is the utility model metal three-decker schematic diagram.
Fig. 4 is the utility model metal back layer structural representation
In figure: 1, metal surface, 2, two layers, metal, 3, three layers, metal, 4, metal back layer, 5, buffer layer, 6, metal pivot pin, 7, metal routing, 8, concentric cable, 9, inner core, 10, joint, 11, wire head, 12, plain conductor.
Embodiment
Fig. 1, 2, 3, shown in 4: by two layer 2, metal surface 1 and metal, three layer 3, metal, metal back layer 4 and between arrange buffer layer 5 stack combinations, and form a test base plate by its surrounding along the fastening one of the equally distributed multiple metal pivot pins 6 of straight line, on test base plate, two vertical concentric cable 8 arranged side by side are housed, the concentric cable that fills 8 upper ends be provided with joint 10, lower end is welded on inner core 9 on the wire head 11 of two layer 2, metal through metal surface 1, on metal surface 1 and two layer 2, metal and three layer 3, metal and metal back layer 4, be respectively arranged with different metal routing 7 or plain conductor 12.The set metal routing 7 of metal surface 1 is along surrounding inner edge cycle arrangement, and middle part is each two concentric cable 8 both sides forms " several " shape structure of relatively arranging.Metal routing 7 on two layer 2, metal arranges along surrounding inner edge ring-type, has a serpentine plain conductor 12 in metal routing 7, and two terminations in the middle of plain conductor 12 is bent to are wire heads 11 of welding inner core 9.On three layer 3, metal, be provided with the annular metal cabling 7 along surrounding inner edge, there is the metal routing 7 of " I " font centre.On metal back layer 4, there is a loop metal routing 7 along surrounding inner edge.Concentric cable 8 is half steel concentric cable 8 of 50 ohm of impedances.
Three layers, two layer 2, metal surface 1, metal, metal and metal back layer 4 related in the utility model are traditional PCB, that is: printed circuit board (PCB).Buffer layer 5 is the isolation interlayer in the middle of traditional printing circuit board.
Claims (6)
1. a common mode current noise field detecting device, comprise concentric cable (8), it is characterized in that: by metal surface (1) and two layers, metal (2), three layers, metal (3), metal back layer (4) and between arrange buffer layer (5) stack combinations, and form a test base plate by its surrounding along the fastening one of the equally distributed multiple metal pivot pins of straight line (6), on test base plate, two vertical concentric cable arranged side by side (8) are housed, the concentric cable that fills (8) upper end be provided with joint (10), lower end is welded on inner core (9) on the wire head (11) of metal two layers (2) through metal surface (1), on metal surface (1) and metal two layers (2) and metal three layers (3) and metal back layer (4), be respectively arranged with different metal routing (7) or plain conductor (12).
2. common mode current noise field detecting device according to claim 1, it is characterized in that: the suitable surrounding inner edge cycle arrangement of metal routing (7) that metal surface (1) is set, middle part respectively forms " several " shape structure of relatively arranging in two concentric cable (8) both sides.
3. common mode current noise field detecting device according to claim 1, it is characterized in that: the metal routing (7) on metal two layers (2) arranges along surrounding inner edge ring-type, in metal routing (7), have a serpentine plain conductor (12), two terminations in the middle of plain conductor (12) is bent to are wire heads (11) of welding inner core (9).
4. common mode current noise field detecting device according to claim 1, is characterized in that: metal is provided with the annular metal cabling (7) along surrounding inner edge on three layers (3), and there is the metal routing (7) of " I " font centre.
5. common mode current noise field detecting device according to claim 1, is characterized in that: metal back layer (4) is upper has a loop metal routing (7) along surrounding inner edge.
6. common mode current noise field detecting device according to claim 1, is characterized in that: described concentric cable (8) is the half steel concentric cable (8) of 50 ohm of impedances.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420166494.6U CN203759138U (en) | 2014-04-04 | 2014-04-04 | Common mode current noise magnetic field detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420166494.6U CN203759138U (en) | 2014-04-04 | 2014-04-04 | Common mode current noise magnetic field detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203759138U true CN203759138U (en) | 2014-08-06 |
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ID=51254394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420166494.6U Withdrawn - After Issue CN203759138U (en) | 2014-04-04 | 2014-04-04 | Common mode current noise magnetic field detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203759138U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020364A (en) * | 2014-04-04 | 2014-09-03 | 湖北文理学院 | Magnetic-field detector of common-mode current noise |
-
2014
- 2014-04-04 CN CN201420166494.6U patent/CN203759138U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020364A (en) * | 2014-04-04 | 2014-09-03 | 湖北文理学院 | Magnetic-field detector of common-mode current noise |
| CN104020364B (en) * | 2014-04-04 | 2016-08-17 | 湖北文理学院 | Common mode current noise field detecting device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140806 Termination date: 20150404 |
|
| EXPY | Termination of patent right or utility model | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140806 Effective date of abandoning: 20160817 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |