WO2010047149A1 - Dispositif d’évaluation du bruit - Google Patents

Dispositif d’évaluation du bruit Download PDF

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Publication number
WO2010047149A1
WO2010047149A1 PCT/JP2009/060535 JP2009060535W WO2010047149A1 WO 2010047149 A1 WO2010047149 A1 WO 2010047149A1 JP 2009060535 W JP2009060535 W JP 2009060535W WO 2010047149 A1 WO2010047149 A1 WO 2010047149A1
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WO
WIPO (PCT)
Prior art keywords
noise
evaluation device
noise evaluation
contact terminal
module
Prior art date
Application number
PCT/JP2009/060535
Other languages
English (en)
Japanese (ja)
Inventor
明博 難波
卓 須賀
敦 原
辰次 野間
Original Assignee
株式会社日立製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社日立製作所 filed Critical 株式会社日立製作所
Publication of WO2010047149A1 publication Critical patent/WO2010047149A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
    • G01R31/002—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing where the device under test is an electronic circuit

Definitions

  • the present invention relates to a device for measuring electrical noise generated from a device module that operates by supplying electric energy.
  • Electromagnetic unnecessary radiation generated from electronic equipment such as information processing equipment and digital AV equipment is a problem.
  • the noise source is often identified by noise source search.
  • As a noise source exploration method for example, as described in JP-A-11-83918 and JP-A-2004-198232, an electromagnetic field distribution in the vicinity of an electronic circuit board or a cable connecting two or more boards is used. There is a method of measuring with an electromagnetic field sensor.
  • a method for measuring electromagnetic radiation from a housing on which a board is mounted for example, as shown in Japanese Patent Application Laid-Open No. 11-190754, there is a method of measuring radiation current from a closed box containing a board to the ground. . Further, as a method for measuring a propagation path of noise flowing out from the substrate to the housing, there is a joint noise measurement method as disclosed in, for example, Japanese Patent Laid-Open No. 2007-240162.
  • the measurement methods described in Japanese Patent Application Laid-Open Nos. 11-83918 and 2004-198232 can measure the noise source on the object, but the substrate is not disposed when the substrate is installed in the casing. There is a problem that it is impossible to measure the noise propagation path that propagates from the housing to the housing. In order to suppress unwanted radiation, it is necessary not only to suppress the noise source but also to cut the noise propagation path, and a technique for measuring the noise propagation path is required. In addition, with the measurement method described in Japanese Patent Application Laid-Open No. 11-190752, the electromagnetic radiation of the electrical equipment that houses the substrate can be evaluated, but similarly, the noise propagation path between the substrate and the housing cannot be measured.
  • the measurement method described in Japanese Patent Application Laid-Open No. 2007-240162 is effective for measuring noise propagated to a joint component such as a screw connecting a housing and a substrate, but noise due to a path other than the joint component cannot be evaluated. Is not enough.
  • the present invention provides a noise evaluation apparatus that solves the above-described problems. That is, the present invention provides a noise evaluation apparatus that can measure a noise propagation path regardless of the position of a joining component in order to evaluate noise flowing out from a device module that is a noise source to a housing. .
  • the noise evaluation apparatus has a contact terminal for electrically connecting a module that operates by supplying electric energy and a ground that provides a potential reference. Furthermore, a noise detection unit for measuring electrical noise flowing in the contact terminal is provided.
  • the types of electrical noise include noise current flowing through the contact terminals and noise voltage between the module under measurement and the reference ground.
  • a plurality of contact terminals and noise detection units are provided as a set, and the noise distribution flowing out from the module is measured by arranging them in an array. Further, the noise distribution is measured by making the contact terminal and the noise detection terminal movable.
  • a noise evaluation apparatus for measuring electrical noise generated from an apparatus module, which is electrically connected to a ground for providing a potential reference, and is connected to an arbitrary point of the apparatus module.
  • a noise evaluation apparatus comprising: a contact terminal configured to take a noise; and a noise detection unit that measures noise flowing out from the apparatus module to the ground.
  • the noise evaluation device according to (1) wherein the noise detection unit measures a noise current flowing from the device module to the ground via the contact terminal. .
  • the noise evaluation unit measures a noise voltage between the device module and the ground.
  • the noise evaluation apparatus according to (1), wherein the ground, the contact terminal, and the noise detection unit are integrally formed of a multilayer printed board.
  • the first embodiment of the noise evaluation apparatus is arranged on a reference ground 3 and one or a plurality (see FIG.
  • two contact terminals 2 (2a, 2b) and a noise detection unit 1 (1a, 1b) that measures noise flowing in each of the contact terminals 2 (2a, 2b) are appropriately provided. Is done.
  • Each contact terminal 2 is electrically connected between the module to be measured 4 and the reference ground 3, and noise flowing out from the module to be measured 4 to the reference ground 3 through the contact terminal 2 is detected by the noise detector 1.
  • the noise detected by the noise detector 1 is measured by the measuring instrument 10.
  • a switch 9 is provided, and the switch 9 can select any noise detected by the noise detector 1 and input it to the measuring device 10. According to this method, it is not necessary to provide the same number of measuring devices 10 as the number of noise detection units 1, and it is sufficient to provide fewer measuring devices 10 than the number of noise detection units 1 or a single measuring device 10. ⁇ Cost reduction can be achieved.
  • the contact terminal 2 may be movable by adding a configuration having a spring property or the like in order to make the connection with the target module 4 more reliable.
  • the control unit 6 controls the measuring instrument 10 and transfers noise measurement control and measured data to the arithmetic processing unit 7. Moreover, the control part 6 also controls the switch 9, when the switch 9 is provided. The arithmetic processing unit 7 corrects the measured data using the sensitivity characteristic of the noise detection unit 1. Moreover, the noise evaluation apparatus of the present invention is provided with a display unit 8 and displays a noise measurement result and a measurement set value.
  • the display unit 8 displays an arbitrary detection result.
  • the noise spectrum at a point (FIG. 12) and the noise distribution at an arbitrary frequency (FIG. 13) can be displayed to the user.
  • the horizontal axis of the noise spectrum shown in FIG. 12 indicates frequency
  • the vertical axis indicates noise intensity.
  • the horizontal and vertical axes of the noise distribution shown in FIG. 13 are the coordinates of the noise evaluation position, and the intensity of the color indicates the noise intensity.
  • the present apparatus it is possible to specify the frequency of noise to be countermeasured and the position to be a noise propagation path, and therefore, noise evaluation effective for countermeasures against electromagnetic radiation can be performed.
  • the noise distribution shown in FIG. 13 can be obtained in more detail as the number of the contact terminals 5 with the detection unit is increased, and the arithmetic processing unit 7 can obtain the noise distribution based on the obtained noise distribution. By ranking the strength, etc., it is possible to specify the position to be taken.
  • FIG. 3 shows an example in which a plurality of contact terminals 5 with detecting portions are arranged in an array on the reference ground 3. According to this arrangement example, since the noise can be detected by bringing the contact terminal 5 with the detection unit into contact with the entire surface of the module 4 to be measured, the noise propagation path can be specified more accurately.
  • the arrangement of the contact terminals 5 with the detection unit is not limited to this, and may be a lattice shape or a staggered shape, and the arrangement interval may be regular or irregular.
  • the module to be measured 4 is placed in contact with the plurality of contact terminals 5 with detection units arranged in this manner, and the noise distribution flowing out from the module to be measured 4 to the reference ground 3 is measured. .
  • the contact terminal with the detection unit uses a contact terminal having a structure that can be expanded and contracted and that generates a force in the extending direction. May be.
  • FIG. 5 shows an example in which the current detection coil 11 is used as a noise detection unit.
  • a magnetic field generated by a noise current flowing out from the measured module 4 toward the reference ground 3 via the contact terminal 2 is detected by interlinking with the current detection coil 11.
  • the current detection coil 11 generates an induced electromotive force proportional to the noise current intensity.
  • the noise current flowing out from the module under measurement 4 is measured.
  • the current detection coil is not limited to this, and a multiple coil as shown in FIG. 7 may be used in order to supplement the magnetic flux due to the noise current.
  • FIG. 8 shows an example in which the voltage detection probe 12 is used as a noise detection unit.
  • the voltage detection element 13 is embedded in the contact terminal 2 and the voltage across the voltage detection element 13 is detected by the voltage detection probe 12, whereby the noise voltage flowing out from the module under measurement 4 can be measured.
  • a passive element such as a resistor, a capacitor, and an inductor may be used.
  • a noise detection unit using an active element may be used.
  • a noise detection unit 1 for detecting the potential between the module under measurement 4 and the reference ground 3 may be provided.
  • FIG. 9 shows the noise detection unit 1 including a transistor 15 having one end connected to the bias voltage source 17 and an adjustment element 16 connecting the transistor and the ground.
  • the noise detector 1 detects a voltage corresponding to the potential difference between the module under measurement 4 and the reference ground 3.
  • a noise current detection circuit using an active element or a noise voltage detection circuit may be appropriately configured.
  • FIG. 10 shows an example in which a noise detection unit, a reference ground, and a contact terminal are integrally formed by a multilayer printed board.
  • the current flowing through the contact terminal 2 can be obtained by forming the current detection coil 11 formed in the inner layer of the multilayer printed board in the periphery of the contact terminal 2 formed by the via inside the multilayer printed board. It can be measured by the current detection coil 11.
  • the via is connected to the ground layer which is the reference ground, and is connected to the target module 4 on the surface layer.
  • the induced voltage generated in the current detection coil 11 due to the noise current flowing in the via is guided to the connector installed in the wiring layer via the lead-out wiring of the transmission line structure formed in the wiring layer, and via the high-frequency cable or the like.
  • Detect with measuring instrument In order to ensure the connection between the via and the target module 4, a contact terminal having a spring property may be provided on the surface layer. According to this embodiment, since the noise detection unit has a structure integrated with the contact terminal 2, it is difficult to dispose a voltage detection probe or the like on the contact surface between the plurality of contact terminals and the module to be measured 4. It is possible to easily detect noise at a contact location near the center of the surface.
  • FIG. 11 shows a noise detector that provides a coupling pad 14 in the vicinity of the module to be measured 4 and performs noise measurement by capacitive coupling between the module to be measured 4 and the coupling pad 14. Noise flowing out from the module under measurement 4 flows to the reference ground 3 by capacitive coupling, and the noise can be detected by the noise detector 1.
  • the module to be measured is not configured to be electrically connected to the contact terminal, so that problems such as wear of the contact terminal 2 do not occur, and the life of the noise evaluation device can be extended. .
  • FIG. 14 shows a form in which the module to be measured 4 is mounted on the bottom surface of the apparatus housing 31.
  • the noise outflow path from the module under measurement 4 to the device housing 31 is the bottom surface of the module under measurement where the module under measurement 4 and the device housing 31 are in contact. 5 is arranged appropriately.
  • FIG. 13A and 13B the noise which flows out from the module in a module mounting form can be measured.
  • FIG. 15 shows a module mounting form in which the both side surfaces of the module under measurement 4 and the device casing 31 are in contact with each other.
  • the contact terminal 5 with a noise detector is provided on the contact surface 21. Deploy. Thereby, noise flowing out from the module in the module mounting form shown in FIG. 14 can be measured.
  • FIG. 16 shows a form in which the module under measurement 4 is mounted on the apparatus casing 21 using a stay 32 attached to the side surface of the apparatus casing 31.
  • the noise outflow path from the module under measurement 4 to the device housing 31 is a place where the module under measurement 4 and the stay 32 are in contact with each other, so the contact terminal 5 with a noise detector is disposed on the contact surface 21.
  • the contact terminal 5 with a noise detector is disposed on the contact surface 21.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Tests Of Electronic Circuits (AREA)

Abstract

La présente invention a pour objet un dispositif d’évaluation du bruit destiné à mesurer le bruit électrique émanant d’un module de dispositif qui est commandé par l’apport d’énergie électrique. Le dispositif d’évaluation du bruit possède un module qui est commandé par l’apport d’énergie électrique, et une unité de détection de bruit qui possède des terminaux de connexion destinés à réaliser des connexions électriques entre des terres fournissant un potentiel de référence, et qui détecte le bruit électrique circulant vers les terres par les terminaux de connexion. De plus, la distribution du bruit émanant du module est mesurée par la disposition des terminaux de connexion et de l’unité de détection du bruit sous la forme d’un réseau.
PCT/JP2009/060535 2008-10-24 2009-06-09 Dispositif d’évaluation du bruit WO2010047149A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008-273720 2008-10-24
JP2008273720A JP5433202B2 (ja) 2008-10-24 2008-10-24 ノイズ評価装置

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WO2010047149A1 true WO2010047149A1 (fr) 2010-04-29

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101848751B1 (ko) * 2016-11-23 2018-04-13 (주)그린텍시스템 노이즈 상태 표시기능을 갖는 지능형 파이로트 램프

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0864984A (ja) * 1994-08-19 1996-03-08 Hitachi Ltd 低ｅｍｉ構造
JPH08146064A (ja) * 1994-11-25 1996-06-07 Nec Corp 電流プローブ
JPH11223647A (ja) * 1998-02-06 1999-08-17 Ricoh Co Ltd 近磁界プローブによる電磁ノイズ測定装置。
JPH11317585A (ja) * 1998-05-01 1999-11-16 Fuji Xerox Co Ltd 電子機器および回路基板支持装置
JP2005345399A (ja) * 2004-06-07 2005-12-15 Yoshinori Seki 小型広帯域高周波信号源を使った遮蔽率測定方法
JP2006003114A (ja) * 2004-06-15 2006-01-05 Canon Inc 電磁界ベクトル分布測定装置における基準信号検出方法
JP2007040894A (ja) * 2005-08-04 2007-02-15 Funai Electric Co Ltd 電磁妨害波測定装置
JP2007085741A (ja) * 2005-09-20 2007-04-05 Hitachi Ltd 電磁波発生源探査方法及びそれに用いる電流プローブ
JP2007240162A (ja) * 2006-03-06 2007-09-20 Hitachi Ltd 接合部電流又は電圧検出及び調整機能を有する回路基板及びそれを実装した電子機器
JP2008060435A (ja) * 2006-09-01 2008-03-13 Hitachi Ltd 不要電磁輻射抑制回路及び実装構造及びそれを実装した電子機器

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0864984A (ja) * 1994-08-19 1996-03-08 Hitachi Ltd 低ｅｍｉ構造
JPH08146064A (ja) * 1994-11-25 1996-06-07 Nec Corp 電流プローブ
JPH11223647A (ja) * 1998-02-06 1999-08-17 Ricoh Co Ltd 近磁界プローブによる電磁ノイズ測定装置。
JPH11317585A (ja) * 1998-05-01 1999-11-16 Fuji Xerox Co Ltd 電子機器および回路基板支持装置
JP2005345399A (ja) * 2004-06-07 2005-12-15 Yoshinori Seki 小型広帯域高周波信号源を使った遮蔽率測定方法
JP2006003114A (ja) * 2004-06-15 2006-01-05 Canon Inc 電磁界ベクトル分布測定装置における基準信号検出方法
JP2007040894A (ja) * 2005-08-04 2007-02-15 Funai Electric Co Ltd 電磁妨害波測定装置
JP2007085741A (ja) * 2005-09-20 2007-04-05 Hitachi Ltd 電磁波発生源探査方法及びそれに用いる電流プローブ
JP2007240162A (ja) * 2006-03-06 2007-09-20 Hitachi Ltd 接合部電流又は電圧検出及び調整機能を有する回路基板及びそれを実装した電子機器
JP2008060435A (ja) * 2006-09-01 2008-03-13 Hitachi Ltd 不要電磁輻射抑制回路及び実装構造及びそれを実装した電子機器

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JP2010101760A (ja) 2010-05-06
JP5433202B2 (ja) 2014-03-05

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