JP2016143476A - Ground structure of electronic device, electronic device having ground structure, and ground cable for ground structure - Google Patents

Ground structure of electronic device, electronic device having ground structure, and ground cable for ground structure Download PDF

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JP2016143476A
JP2016143476A JP2015016555A JP2015016555A JP2016143476A JP 2016143476 A JP2016143476 A JP 2016143476A JP 2015016555 A JP2015016555 A JP 2015016555A JP 2015016555 A JP2015016555 A JP 2015016555A JP 2016143476 A JP2016143476 A JP 2016143476A
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ground
electronic device
external structure
grounding
electrically connected
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JP6502687B2 (en
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淳史 倉内
Junji Kurauchi
淳史 倉内
弘智 氏家
Hirotomo Ujiie
弘智 氏家
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Honda Motor Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To prevent malfunction of an electronic device by stabilizing the potential of a ground line grounded to an external structure, even under an environment where a large external radiation noise exists, in the electronic device.SOLUTION: A ground structure for grounding an electronic device (100) to an external structure (132) includes a ground cable (130) constituted of a central conductor (138), and a shield clothing (140) provided to surround the central conductor. The central conductor of the ground cable is configured to connect the ground line of the electronic device and the external structure electrically, and the shield clothing is configured so that one end is connected electrically with the external structure, and the other end is not connected with the electronic device but is in an open state.SELECTED DRAWING: Figure 1

Description

本発明は、電子装置の接地構造に関し、特に、外来輻射雑音があっても電子装置の接地電位に変動を生じさせ難い接地構造に関する。   The present invention relates to a grounding structure for an electronic device, and more particularly to a grounding structure that hardly causes fluctuations in the ground potential of an electronic device even when there is external radiation noise.

一の構造物（例えば、車両の車体）の内部において、電源装置から複数の電子装置に電源を供給する場合、各電子装置は当該車両の車体に接地されると共に、これら電子装置の電子回路から流れ出るグランド電流は、当該車体を介して上記電源のグランド端子に還流するよう構成されることが多い。   When power is supplied from a power supply device to a plurality of electronic devices inside a single structure (for example, a vehicle body), each electronic device is grounded to the vehicle body of the vehicle, and from the electronic circuit of these electronic devices. The flowing ground current is often configured to return to the ground terminal of the power source through the vehicle body.

この場合、各電子装置内に収容された電子回路のグランドラインと車体との間の電気的接続は、一般に、当該電子装置と車体との間を接続するリード線（接地線）により行われる。   In this case, the electrical connection between the ground line of the electronic circuit accommodated in each electronic device and the vehicle body is generally performed by a lead wire (ground wire) connecting the electronic device and the vehicle body.

しかしながら、電子装置の設置環境内に大きな電磁輻射雑音が存在する場合には、当該電磁輻射雑音の影響により接地線においてグランド電位の変動が生じ、電子装置に誤動作が生じ得る。例えば車両においては、当該車両内に用いられる内燃機関（例えば、その点火プラグ）や大電流モータは大きな電磁輻射雑音の発生源となり、当該大きな電磁輻射雑音により接地線におけるグランド電位の変動を生じ得る。   However, when there is a large electromagnetic radiation noise in the installation environment of the electronic device, the ground potential fluctuates in the ground line due to the influence of the electromagnetic radiation noise, and the electronic device may malfunction. For example, in a vehicle, an internal combustion engine (for example, a spark plug) or a large current motor used in the vehicle is a source of large electromagnetic radiation noise, and the large electromagnetic radiation noise can cause fluctuations in the ground potential on the ground line. .

また、電源装置のグランド端子と電子装置のグランドラインとがワイヤハーネスにより直接的に接続されている場合であっても、電源装置のグランド端子と、電子装置のグランドラインとが、外部構造物に対して個別に接地される場合には、上述したような大きな電磁輻射雑音の存在により、電源装置のグランド電位と電子装置のグランド電位との間の電位差に変動が生じて、電子装置の動作に誤りを発生する事態が生じ得る。   Even if the ground terminal of the power supply device and the ground line of the electronic device are directly connected by the wire harness, the ground terminal of the power supply device and the ground line of the electronic device are not connected to the external structure. When grounded individually, the presence of the large electromagnetic radiation noise described above causes a fluctuation in the potential difference between the ground potential of the power supply device and the ground potential of the electronic device. An error can occur.

上記の背景より、大きな外部輻射雑音が存在する環境下でも、外部構造物に接地されたグランドラインの電位を安定化させて電子装置の誤動作を防止し得る、接地構造の実現が望まれている。   From the above background, it is desired to realize a grounding structure capable of stabilizing the potential of the ground line grounded to the external structure and preventing malfunction of the electronic device even in an environment where large external radiation noise exists. .

本発明の一の態様は、電子装置を外部構造物に接地するための接地構造である。本接地構造は、中心導体と、前記中心導体を取り巻くように設けられたシールド被服と、により構成された接地ケーブルを備え、前記接地ケーブルの前記中心導体は前記電子装置のグランドラインと前記外部構造物とを電気的に接続するよう構成され、前記シールド被服は、当該シールド被服の一端が前記外部構造物と電気的に接続され、当該シールド被服の他端が前記電子装置に接続されることなく開放状態となるように構成されている。
本発明の他の態様によると、前記シールド被服の前記一端と前記外部構造物とが電気的に接続される位置は、前記中心導体と前記外部構造物とが電気的に接続される位置と同じ位置又はその近傍位置に設けられる。
本発明の他の態様によると、前記中心導体のうち前記電子装置のグランドラインに接続されていない一端と、前記シールド被服のうち前記開放状態となるように構成されていない一端とが電気的に接続され、当該電気的に接続された部分と前記外部構造物との間が、前記中心導体よりもインピーダンスの小さい導体により電気的に接続されている。
本発明の他の態様によると、前記外部構造物は、前記電子装置から電源のグランド端子に至るグランド電流経路の一部を構成するものである。
本発明の他の態様によると、前記シールド被服と前記外部構造物とが電気的に接続される位置は、当該位置から前記電源の前記グランド端子に至るまでの電流経路の距離が、前記中心導体と前記外部構造物とが電気的に接続される位置から前記電源の前記グランド端子に至るまでの電流経路の距離よりも短くなる位置に設けられる。
本発明の他の態様は、上述したいずれかの接地構造を有する電子装置である。
本発明の他の態様は、上述した接地構造に用いられる接地ケーブルであって、中心導体と、当該中心導体を取り巻くように設けられたシールド被服と、を備え、前記中心導体の一端と前記シールド被服の一端とが互いに電気的に接続されている。 One aspect of the present invention is a grounding structure for grounding an electronic device to an external structure. The grounding structure includes a grounding cable composed of a central conductor and a shield clothing provided so as to surround the central conductor, and the central conductor of the grounding cable includes a ground line of the electronic device and the external structure. The shield clothing is configured such that one end of the shield clothing is electrically connected to the external structure, and the other end of the shield clothing is not connected to the electronic device. It is comprised so that it may be in an open state.
According to another aspect of the present invention, the position where the one end of the shield clothing is electrically connected to the external structure is the same as the position where the central conductor is electrically connected to the external structure. It is provided at the position or its vicinity.
According to another aspect of the present invention, one end of the central conductor not connected to the ground line of the electronic device and one end of the shield clothing not configured to be in the open state are electrically connected. The electrically connected portion and the external structure are electrically connected by a conductor having a smaller impedance than the center conductor.
According to another aspect of the present invention, the external structure constitutes a part of a ground current path from the electronic device to a ground terminal of a power source.
According to another aspect of the present invention, the position where the shield clothing and the external structure are electrically connected is the distance of the current path from the position to the ground terminal of the power source. And the external structure are provided at a position shorter than the distance of the current path from the position where the external structure is electrically connected to the ground terminal of the power source.
Another aspect of the present invention is an electronic device having any one of the grounding structures described above.
Another aspect of the present invention is a grounding cable used in the grounding structure described above, comprising a center conductor and a shield garment provided so as to surround the center conductor, and one end of the center conductor and the shield One end of the clothing is electrically connected to each other.

本発明の一実施形態に係る接地構造を用いた電子装置の構成を示すブロック図である。It is a block diagram which shows the structure of the electronic device using the grounding structure which concerns on one Embodiment of this invention. 図１に示す接地構造に用いられる接地ケーブルの構造の一例を示す図である。It is a figure which shows an example of the structure of the grounding cable used for the grounding structure shown in FIG.

以下、図面を参照して、本発明の実施の形態を説明する。
図１は、本発明の一実施形態に係る接地構造を用いた電子装置の構成を示すブロック図である。本電子装置は、例えば車両内に設けられてモータ制御を行う制御装置である。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of an electronic device using a ground structure according to an embodiment of the present invention. The electronic apparatus is a control apparatus that is provided in a vehicle and performs motor control, for example.

本制御装置１００は、回路基板１０２と、回路基板１０２を収容する導電性材料（例えばアルミニウム等の金属）で構成された筺体１０４と、を有する。回路基板１０２上には所定の機能を実現する回路ブロック１０６、１０８、１１０により電子回路（制御回路）が構成されている。なお、回路基板１０２は筐体１０４に収容されているため、筐体１０４の外部から回路基板１０２を視認することはできないが、図１においては、説明のため、筐体１０４の内部に収容されている部分についても実線を用いて示している。   The control device 100 includes a circuit board 102 and a housing 104 made of a conductive material (for example, a metal such as aluminum) that accommodates the circuit board 102. On the circuit board 102, an electronic circuit (control circuit) is configured by circuit blocks 106, 108, and 110 that realize predetermined functions. Note that since the circuit board 102 is housed in the housing 104, the circuit board 102 cannot be visually recognized from the outside of the housing 104. However, in FIG. The part which is shown is also shown using a solid line.

回路ブロック１０６〜１１０は、回路基板１０２上に設けられたコネクタ１１２と、コネクタ１１２に接続されたワイヤハーネス１１４とを介して、センサ１１６や、アクチュエータ等の制御対象１１８に接続されている。また、車両内に設けられたバッテリ１２０の＋Ｖ端子と回路基板１０２上の回路ブロック１０６〜１１０とが、コネクタ１１２とワイヤハーネス１１４とを介して接続されている。   The circuit blocks 106 to 110 are connected to a control object 118 such as a sensor 116 or an actuator via a connector 112 provided on the circuit board 102 and a wire harness 114 connected to the connector 112. Further, the + V terminal of the battery 120 provided in the vehicle and the circuit blocks 106 to 110 on the circuit board 102 are connected via the connector 112 and the wire harness 114.

ここで、例えば、回路ブロック１０６は、センサ１１６からのセンサ信号を増幅してデジタル信号に変換する小信号増幅回路ブロックであり、回路ブロック１０８は、回路ブロック１０６から出力されたデジタル信号を処理し、当該処理の結果であるデジタル信号を出力する演算処理回路ブロックであり、回路ブロック１１０は、回路ブロック１０８から出力されたデジタル信号をアナログ信号に変換し、当該アナログ信号に基づいて制御対象１１８を制御する制御回路ブロックである。   Here, for example, the circuit block 106 is a small signal amplification circuit block that amplifies the sensor signal from the sensor 116 and converts it into a digital signal, and the circuit block 108 processes the digital signal output from the circuit block 106. An arithmetic processing circuit block that outputs a digital signal as a result of the processing. The circuit block 110 converts the digital signal output from the circuit block 108 into an analog signal, and controls the control target 118 based on the analog signal. It is a control circuit block to control.

回路基板１０２には、各回路ブロックを構成する電気部品のグランドが接続されるグランドパターン１２２が形成されており、グランドパターン１２２は、金属（例えば銅板）等の導電性材料で構成された導体１２４を介して筺体１０４と電気的に接続されている。また、筺体１０４は、接続端子１２６、１２８と接地ケーブル１３０とを介して外部構造物１３２（例えば車体）と電気的に接続されている。   The circuit board 102 is formed with a ground pattern 122 to which the grounds of the electrical components constituting each circuit block are connected. The ground pattern 122 is a conductor 124 made of a conductive material such as a metal (for example, a copper plate). It is electrically connected to the housing 104 via. The housing 104 is electrically connected to an external structure 132 (for example, a vehicle body) via connection terminals 126 and 128 and a ground cable 130.

バッテリ１２０のＧＮＤ端子（グランド端子）は、リード線１３４及び接続端子１３６を介して外部構造物１３２に接続されており、これにより、バッテリ１２０の＋Ｖ端子からワイヤハーネス１１４を介して回路基板１０２上の回路ブロック１０６〜１１０に供給された電流は、グランドパターン１２２、導体１２４、筺体１０４、接地ケーブル１３０、及び外部構造物１３２を経て、バッテリ１２０のＧＮＤ端子へ還流する。   The GND terminal (ground terminal) of the battery 120 is connected to the external structure 132 via the lead wire 134 and the connection terminal 136, so that the + V terminal of the battery 120 is connected to the circuit board 102 via the wire harness 114. The current supplied to the circuit blocks 106 to 110 flows back to the GND terminal of the battery 120 through the ground pattern 122, the conductor 124, the housing 104, the ground cable 130, and the external structure 132.

特に、接地ケーブル１３０は、中心導体１３８と、中心導体１３８を取り巻くように構成された導電性のシールド被覆１４０と、で構成されている。中心導体１３８は、回路基板１０２のグランド電位が外部構造物１３２の電位と等しくなるように、その両端が接続端子１２６、１２８を介して筺体１０４と外部構造物１３２とにそれぞれ電気的に接続されている。一方、シールド被覆１４０は、その一端が、中心導体１３８と外部構造物１３２との接続点（又はその近傍）において当該外部構造体１３２と電気的に接続され、他端は筺体１０４には接続されず開放（オープン）状態となっている。   In particular, the ground cable 130 includes a center conductor 138 and a conductive shield coating 140 configured to surround the center conductor 138. The center conductor 138 is electrically connected to the housing 104 and the external structure 132 via connection terminals 126 and 128 so that the ground potential of the circuit board 102 becomes equal to the potential of the external structure 132. ing. On the other hand, one end of the shield coating 140 is electrically connected to the external structure 132 at the connection point (or the vicinity thereof) between the central conductor 138 and the external structure 132, and the other end is connected to the housing 104. It is in an open (open) state.

これにより、制御装置１００の設置環境内で発生した外部輻射雑音が接地ケーブル１３０に到来した場合、当該外部輻射雑音により接地ケーブル１３０のシールド被覆１４０に雑音電荷が誘導されて電位変動が生じるが、中心導体１３８は、シールド被覆１４０により電気的に保護されているため、当該中心導体１３８には電位変動は誘発されない。また、シールド被覆１４０は、その一端が外部構造物１３２に接続され、他端は筺体１０４に接続されていないため、シールド被覆１４０に発生した誘導電荷は外部構造物１３２にのみ流れ込み、筺体１０４へは流れ込まない。このため、シールド被覆１４０に電位変動が生じても、当該電位変動は筺体１０４を介して回路基板１０２上のグランドパターン１２２の電位を変動させることがない。   Thereby, when external radiation noise generated in the installation environment of the control device 100 arrives at the ground cable 130, noise charge is induced in the shield coating 140 of the ground cable 130 due to the external radiation noise, and potential fluctuation occurs. Since the center conductor 138 is electrically protected by the shield coating 140, no potential fluctuation is induced in the center conductor 138. In addition, since one end of the shield coating 140 is connected to the external structure 132 and the other end is not connected to the housing 104, the induced charge generated in the shield coating 140 flows only into the external structure 132 and enters the housing 104. Does not flow. For this reason, even if potential fluctuation occurs in the shield coating 140, the potential fluctuation does not cause the potential of the ground pattern 122 on the circuit board 102 to fluctuate via the housing 104.

また、シールド被覆１４０から外部構造物１３２に流れ込んだ雑音電荷は、当該外部構造物１３２を介してバッテリ１２０のＧＮＤ端子へ速やかに流れ込む。ここで、電気回路の接地に用いられる外部構造物１３２は、一般に、例えば車体等の、外部輻射雑音によって誘導される程度の電荷が流れてもその電位が実質的に変動しない程度に十分大きな体積を持つ導体により構成され、場合によってはその一部が直接又は間接に大地と電気的に接触している。このため、外部輻射雑音によりシールド被覆１４０に発生した電荷が外部構造物１３２に流れても、当該外部構造物１３２の電位は変動せず安定しており、したがって、回路基板１０２上のグランドパターン１２２のグランド電位も、中心導体１３８を介して外部構造物１３２と同様の安定した電位に保たれる。その結果、制御装置１００は、大きな外部輻射雑音が発生するような環境に設置されている場合でも、グランド電位が一定に維持され、安定な制御動作を行うことができる。   Further, the noise charge that has flowed into the external structure 132 from the shield coating 140 quickly flows into the GND terminal of the battery 120 via the external structure 132. Here, the external structure 132 used for the grounding of the electric circuit is generally a sufficiently large volume such that the electric potential of the external structure 132 such as a vehicle body does not substantially fluctuate even when electric charges induced by external radiation noise flow. In some cases, a part thereof is in direct or indirect electrical contact with the ground. For this reason, even if the charge generated in the shield coating 140 due to external radiation noise flows to the external structure 132, the potential of the external structure 132 does not change and is stable, and therefore the ground pattern 122 on the circuit board 102 is stable. This ground potential is also maintained at a stable potential similar to that of the external structure 132 via the central conductor 138. As a result, even when the control device 100 is installed in an environment in which large external radiation noise is generated, the ground potential is kept constant and a stable control operation can be performed.

図２は、図１に示す接地ケーブル１３０の構成の一例を示す図である。
本接地ケーブル１３０は同軸上のケーブルであり、図２（ａ）はその径方向の断面図、図２（ｂ）は長さ方向の側断面図である。
本接地ケーブル１３０は、チューブ状の絶縁物２００の中心に中心導体１３８が形成され、絶縁物２００の周囲には中心導体１３８を取り巻くようにシールド被覆１４０が設けられ、シールド被覆１４０の外側外周部には外被２０２が設けられている。そして、中心導体１３８が外部構造物１３２に接続される図示下側（図３（ｂ））において、中心導体１３８とシールド被覆１４０とが、例えば圧着やハンダにより互いに接続されている。 FIG. 2 is a diagram illustrating an example of the configuration of the ground cable 130 illustrated in FIG. 1.
The ground cable 130 is a coaxial cable, FIG. 2A is a sectional view in the radial direction, and FIG. 2B is a sectional side view in the length direction.
In the ground cable 130, a center conductor 138 is formed at the center of the tubular insulator 200, and a shield coating 140 is provided around the insulator 200 so as to surround the center conductor 138. Is provided with a jacket 202. The center conductor 138 and the shield coating 140 are connected to each other by, for example, crimping or soldering on the lower side (FIG. 3B) where the center conductor 138 is connected to the external structure 132.

なお、本実施形態では、シールド被覆１４０の一端を、中心導体１３８と外部構造物１３２との接続点又はその近傍に接続するものとしたが、これに限らず、シールド被覆１４０の一端を、当該接続点よりもバッテリ１２０のＧＮＤ端子に近い（すなわち、ＧＮＤ端子に至るまでの電流経路長がより短くなる）外部構造物１３２上の任意の箇所に接続するものとしても良い。   In the present embodiment, one end of the shield coating 140 is connected to the connection point of the central conductor 138 and the external structure 132 or the vicinity thereof. It may be connected to any location on the external structure 132 that is closer to the GND terminal of the battery 120 than the connection point (that is, the current path length to the GND terminal is shorter).

また、これに代えて、筺体１０４に接続されていない側の中心導体１３８の一端とシールド被覆１４０の一端とを接続し、当該中心導体１３８よりも十分に低いインピーダンス（例えば、中心導体１３８のインピーダンスの１／１０以下）を有する導体（例えば、中心導体１３８よりも短い導体及び又は太い導体）を介して外部構造物１３２に接続するものとしてもよい。これにより、外来輻射雑音によりシールド被覆１４０に誘導された電荷は、筺体１０４の方向に向かって中心導体１３８を伝わることなく、上記低いインピーダンスを有する導体を介して外部構造物１３２へ速やかに流れ出ることとなる。なお、この場合、電磁輻射雑音により当該低いインピーダンスを有する導体自体に電位変動が生じないように、当該導体の長さを十分短くすることが望ましい。   Alternatively, one end of the center conductor 138 on the side not connected to the housing 104 is connected to one end of the shield coating 140, and the impedance is sufficiently lower than the center conductor 138 (for example, the impedance of the center conductor 138). It is good also as what is connected to the external structure 132 through the conductor (For example, a conductor shorter than the center conductor 138, or a thick conductor) which has 1/10 or less. As a result, the charges induced in the shield coating 140 due to the external radiation noise flow quickly to the external structure 132 through the conductor having the low impedance without being transmitted through the central conductor 138 toward the housing 104. It becomes. In this case, it is desirable that the length of the conductor be sufficiently short so that potential fluctuation does not occur in the conductor having the low impedance due to electromagnetic radiation noise.

以上、説明したように、本実施形態では、制御装置の電子回路のグランドが、中心導体とシールド被覆とを有する接地ケーブルを介して、電源へのグランド電流の還流経路の一部を構成する外部構造物に電気的に接続され、当該接地ケーブルは中心導体とシールド被覆とにより構成されている。そして、シールド被覆の一端が中心導体と外部構造物との接続点（またはその近傍）に接続され、シールド被覆の他端はどこにも接続されず電気的に開放（オープン）状態となっている。これにより、環境からの外来輻射雑音によりシールド被覆に誘導された電荷（雑音電荷）は、制御回路へ至ることなく外部構造物へ排出されるので、中心導体には外来輻射雑音に起因する電位変動は発生せず、制御装置のグランド電位は外部構造物と同じ安定な電位に維持される。これにより、大きな外来輻射雑音のある環境においても、制御装置の動作を安定に維持して、制御誤差や制御異常の発生を防止することができる。   As described above, in the present embodiment, the ground of the electronic circuit of the control device is an external circuit that forms part of the return path of the ground current to the power supply via the ground cable having the center conductor and the shield coating. Electrically connected to the structure, the ground cable is constituted by a central conductor and a shield coating. One end of the shield coating is connected to the connection point (or the vicinity thereof) between the central conductor and the external structure, and the other end of the shield coating is not connected anywhere and is in an electrically open (open) state. As a result, the charge (noise charge) induced in the shield coating by the external radiation noise from the environment is discharged to the external structure without reaching the control circuit, so that the potential fluctuation caused by the external radiation noise in the center conductor The ground potential of the control device is maintained at the same stable potential as that of the external structure. Thereby, even in an environment with a large external radiation noise, it is possible to stably maintain the operation of the control device and prevent the occurrence of a control error or a control abnormality.

なお、本実施形態では、外部構造物が、制御装置から電源装置（バッテリ）のグランド端子に至るグランド電流経路の一部を構成するものとして記載したが、本発明に係る接地構造は、これに限らず、電源装置のＧＮＤ端子と電子装置のグランドラインとがワイヤハーネスにより直接的に接続される場合において電源装置のグランド端子と電子装置のグランドラインとが外部構造物に対して個別に接地される場合にも、電子装置及び又は電源装置の接地構造として適用することで、外部輻射雑音の影響（例えば、電源装置と電子装置間でのグランド電位差の変動）を効果的に低減することができる。   In the present embodiment, the external structure is described as constituting a part of the ground current path from the control device to the ground terminal of the power supply device (battery). However, the grounding structure according to the present invention is described here. Not limited to this, when the GND terminal of the power supply device and the ground line of the electronic device are directly connected by the wire harness, the ground terminal of the power supply device and the ground line of the electronic device are individually grounded to the external structure. In this case, the influence of external radiation noise (for example, fluctuation of the ground potential difference between the power supply device and the electronic device) can be effectively reduced by applying as a ground structure of the electronic device and / or the power supply device. .

また、本実施形態では、接地ケーブルを制御装置に接続して当該制御装置のグランドラインを外部構造物に接地するものとしたが、本接地構造は、制御装置のみならず、広く外部輻射雑音によりその動作が不安定となり得る電子装置に適用して外部輻射雑音の影響を効果的に低減することができる。   In the present embodiment, the ground cable is connected to the control device and the ground line of the control device is grounded to the external structure. However, the ground structure is widely used not only by the control device but also by external radiation noise. The effect of external radiation noise can be effectively reduced by applying to an electronic device whose operation may be unstable.

１００・・・制御装置、１０２・・・回路基板、１０４・・・筺体、１０６、１０８、１１０・・・回路ブロック、１１２・・・コネクタ、１１４・・・ワイヤハーネス、１１６・・・センサ、１１８・・・制御対象、１２０・・・バッテリ、１２２・・・グランドパターン、１２４・・・導体、１２６、１２８、１３６・・・接続端子、１３０・・・接地ケーブル、１３２・・・外部構造物、１３４・・・リード線、１３８・・・中心導体、１４０・・・シールド被覆、２００・・・絶縁物、２０２・・・外被。   DESCRIPTION OF SYMBOLS 100 ... Control apparatus, 102 ... Circuit board, 104 ... Housing, 106, 108, 110 ... Circuit block, 112 ... Connector, 114 ... Wire harness, 116 ... Sensor, 118 ... Control object, 120 ... Battery, 122 ... Ground pattern, 124 ... Conductor, 126, 128, 136 ... Connection terminal, 130 ... Ground cable, 132 ... External structure 134, lead wire, 138, central conductor, 140, shield coating, 200, insulator, 202, jacket.

Claims (7)

電子装置を外部構造物に接地するための接地構造であって、
中心導体と、前記中心導体を取り巻くように設けられたシールド被服と、により構成された接地ケーブルを備え、
前記接地ケーブルの前記中心導体は前記電子装置のグランドラインと前記外部構造物とを電気的に接続するよう構成され、
前記シールド被服は、当該シールド被服の一端が前記外部構造物と電気的に接続され、当該シールド被服の他端が前記電子装置に接続されることなく開放状態となるように構成されている、
接地構造。 A grounding structure for grounding an electronic device to an external structure,
A grounding cable comprising a center conductor and a shield garment provided so as to surround the center conductor;
The central conductor of the ground cable is configured to electrically connect a ground line of the electronic device and the external structure;
The shield clothing is configured such that one end of the shield clothing is electrically connected to the external structure, and the other end of the shield clothing is in an open state without being connected to the electronic device.
Grounding structure. 前記シールド被服の前記一端と前記外部構造物とが電気的に接続される位置は、前記中心導体と前記外部構造物とが電気的に接続される位置と同じ位置又はその近傍位置に設けられる、請求項１に記載の接地構造。   The position where the one end of the shield clothing and the external structure are electrically connected is provided at the same position as the position where the central conductor and the external structure are electrically connected or in the vicinity thereof. The grounding structure according to claim 1. 前記中心導体のうち前記電子装置のグランドラインに接続されていない一端と、前記シールド被服のうち前記開放状態となるように構成されていない一端とが電気的に接続され、当該電気的に接続された部分と前記外部構造物との間が、前記中心導体よりもインピーダンスの小さい導体により電気的に接続されている、請求項１に記載の接地構造。   One end of the central conductor that is not connected to the ground line of the electronic device is electrically connected to one end of the shield clothing that is not configured to be in the open state, and is electrically connected. 2. The grounding structure according to claim 1, wherein the portion and the external structure are electrically connected by a conductor having a smaller impedance than the center conductor. 前記外部構造物は、前記電子装置から電源のグランド端子に至るグランド電流経路の一部を構成するものである、請求項１に記載の接地構造。   The ground structure according to claim 1, wherein the external structure constitutes a part of a ground current path from the electronic device to a ground terminal of a power source. 前記シールド被服と前記外部構造物とが電気的に接続される位置は、当該位置から前記電源の前記グランド端子に至るまでの電流経路の距離が、前記中心導体と前記外部構造物とが電気的に接続される位置から前記電源の前記グランド端子に至るまでの電流経路の距離よりも短くなる位置に設けられる、請求項４に記載の接地構造。   The position where the shield clothing and the external structure are electrically connected is the distance of the current path from the position to the ground terminal of the power source, and the center conductor and the external structure are electrically connected. The grounding structure according to claim 4, wherein the grounding structure is provided at a position that is shorter than a distance of a current path from a position connected to the power supply to the ground terminal of the power source. 請求項１ないし５のいずれか一項に記載の接地構造を有する電子装置。   An electronic device having the ground structure according to any one of claims 1 to 5. 請求項１、３、又は４に記載の接地構造に用いられる接地ケーブルであって、中心導体と、当該中心導体を取り巻くように設けられたシールド被服と、を備え、
前記中心導体の一端と前記シールド被服の一端とが互いに電気的に接続されている、
接地ケーブル。 A grounding cable used in the grounding structure according to claim 1, 3, or 4, comprising a center conductor and a shield garment provided so as to surround the center conductor,
One end of the central conductor and one end of the shield clothing are electrically connected to each other;
Ground cable.
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KR101826644B1 (en) * 2016-09-12 2018-02-07 현대오트론 주식회사 Ground connection structure for shield wire

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JP2014099552A (en) * 2012-11-15 2014-05-29 Honda Motor Co Ltd Control device having circuit board having plurality of ground patterns

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JPH0550626U (en) * 1991-12-07 1993-07-02 大三郎 澤居 Electrostatic shield Electromagnetic shield unbalanced cable for musical instruments
JP2002281765A (en) * 2001-03-21 2002-09-27 Meidensha Corp Power conversion facility
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