CN104020364A - Magnetic-field detector of common-mode current noise - Google Patents
Magnetic-field detector of common-mode current noise Download PDFInfo
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- CN104020364A CN104020364A CN201410139712.1A CN201410139712A CN104020364A CN 104020364 A CN104020364 A CN 104020364A CN 201410139712 A CN201410139712 A CN 201410139712A CN 104020364 A CN104020364 A CN 104020364A
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Abstract
The invention provides a magnetic-field detector of common-mode current noise. A surface metal layer, a second metal layer, a third metal layer, a bottom metal layer and dielectric separating layers between the metal layers are combined in a superposed manner and are fastened via metal pivot pins to form a test base plate, the metal pivot pins are linearly uniformly distributed in the periphery of the metal layers and dielectric separating layers, two vertical coaxial cables parallel with each other are mounted on the test base plate, and the metal layers are respectively provided with different metal wires or leads. The detector can convert magnetic-field noise of a device to be tested into current via electromagnetic induction, coaxial wires connected by the coaxial cables are transmitted to a measuring instrument, background electromagnetic noise can be totally shielded, common-mode current magnetic field in differential wires can be inhibited, and the testing effect is improved.
Description
Technical field
The present invention 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 object of the present invention 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 present invention includes 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 present invention compares 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, solved the problem that magnet field probe in prior art is easily subject to background electromagnetic noise interference, have 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 invention will be further described.
Fig. 1 is structural representation of the present invention.
Fig. 2 is metal two-layer structure schematic diagram of the present invention.
Fig. 3 is metal three-decker schematic diagram of the present invention.
Fig. 4 is metal back layer structural representation of the present invention
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 present invention 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 |
|---|---|---|---|
| CN201410139712.1A CN104020364B (en) | 2014-04-04 | 2014-04-04 | Common mode current noise field detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410139712.1A CN104020364B (en) | 2014-04-04 | 2014-04-04 | Common mode current noise field detecting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104020364A true CN104020364A (en) | 2014-09-03 |
| CN104020364B CN104020364B (en) | 2016-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410139712.1A Expired - Fee Related CN104020364B (en) | 2014-04-04 | 2014-04-04 | Common mode current noise field detecting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108957192A (en) * | 2018-07-26 | 2018-12-07 | 北京经纬恒润科技有限公司 | A kind of electromagnetic interference diagnosing system and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09265613A (en) * | 1996-03-28 | 1997-10-07 | Nec Corp | Measuring device for magneto-resistance head |
| CN201156082Y (en) * | 2008-02-22 | 2008-11-26 | 成都必控科技股份有限公司 | Circular magnetic field probe head |
| CN201754154U (en) * | 2010-08-10 | 2011-03-02 | 昆山华得宝检测技术设备有限公司 | Differential output ultrasonic probe and signal processing device composed of same |
| CN202396081U (en) * | 2011-11-18 | 2012-08-22 | 陈佳宏 | Device for inhibiting EMC (Electro Magnetic Compatibility) device by using PCB (Printed Circuit Board) layout |
| CN103474731A (en) * | 2013-09-05 | 2013-12-25 | 湖北文理学院 | Branch knot loading compact type microstrip filter |
| CN203759138U (en) * | 2014-04-04 | 2014-08-06 | 湖北文理学院 | Common mode current noise magnetic field detection device |
-
2014
- 2014-04-04 CN CN201410139712.1A patent/CN104020364B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09265613A (en) * | 1996-03-28 | 1997-10-07 | Nec Corp | Measuring device for magneto-resistance head |
| CN201156082Y (en) * | 2008-02-22 | 2008-11-26 | 成都必控科技股份有限公司 | Circular magnetic field probe head |
| CN201754154U (en) * | 2010-08-10 | 2011-03-02 | 昆山华得宝检测技术设备有限公司 | Differential output ultrasonic probe and signal processing device composed of same |
| CN202396081U (en) * | 2011-11-18 | 2012-08-22 | 陈佳宏 | Device for inhibiting EMC (Electro Magnetic Compatibility) device by using PCB (Printed Circuit Board) layout |
| CN103474731A (en) * | 2013-09-05 | 2013-12-25 | 湖北文理学院 | Branch knot loading compact type microstrip filter |
| CN203759138U (en) * | 2014-04-04 | 2014-08-06 | 湖北文理学院 | Common mode current noise magnetic field detection device |
Non-Patent Citations (1)
| Title |
|---|
| 张英远，郭祥玉: "电子设备的布线技术", 《光电对抗与无源干扰》, 31 January 2002 (2002-01-31), pages 39 - 43 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108957192A (en) * | 2018-07-26 | 2018-12-07 | 北京经纬恒润科技有限公司 | A kind of electromagnetic interference diagnosing system and method |
| CN108957192B (en) * | 2018-07-26 | 2021-03-23 | 北京经纬恒润科技股份有限公司 | Electromagnetic interference diagnosis system and method |
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| Publication number | Publication date |
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| CN104020364B (en) | 2016-08-17 |
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