WO2016208380A1 - Cable device and communication system - Google Patents

Cable device and communication system Download PDF

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Publication number
WO2016208380A1
WO2016208380A1 PCT/JP2016/066893 JP2016066893W WO2016208380A1 WO 2016208380 A1 WO2016208380 A1 WO 2016208380A1 JP 2016066893 W JP2016066893 W JP 2016066893W WO 2016208380 A1 WO2016208380 A1 WO 2016208380A1
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Prior art keywords
coaxial cable
signal
cable
communication
converter
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PCT/JP2016/066893
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French (fr)
Japanese (ja)
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加藤　清
福岡　隆
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株式会社オートネットワーク技術研究所
住友電装株式会社
住友電気工業株式会社
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Publication of WO2016208380A1 publication Critical patent/WO2016208380A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines

Definitions

  • the present invention relates to a cable device for transmitting a signal and a communication system including the cable device.
  • the vehicle is equipped with a communication system (for example, refer to Patent Document 1) in which a plurality of communication devices, for example, a plurality of electronic control units (Electronic Control Units) that control electronic devices communicate with each other.
  • a communication system for example, refer to Patent Document 1
  • a plurality of communication devices for example, a plurality of electronic control units (Electronic Control Units) that control electronic devices communicate with each other.
  • a plurality of communication devices are connected to each other by a twisted pair cable having two twisted conductors.
  • Each of the plurality of communication devices transmits a differential signal via a twisted pair cable by applying a predetermined voltage, for example, a voltage of 1 V or more, or a voltage lower than the predetermined voltage, between the two conductors.
  • a predetermined voltage for example, a voltage of 1 V or more, or a voltage lower than the predetermined voltage
  • Each of the plurality of communication devices receives a differential signal via a twisted pair cable by detecting a voltage between two conductors.
  • Patent Document 1 there is a communication system in which large-capacity data, for example, data related to video captured by a camera is transmitted and received between a plurality of communication devices.
  • this communication system high-speed communication using a differential signal having a high bit rate is performed.
  • a shielded twisted pair cable two conductors are shielded from external electromagnetic waves by a conductor, so that the waveform of the differential signal is not distorted by disturbance noise.
  • a twisted pair cable with a shield has a problem that it is heavy and large because two conductors are covered with a conductor.
  • the present invention has been made in view of such circumstances, and an object of the present invention is to provide a light and small size capable of realizing high-speed communication without changing an existing communication configuration for transmitting and receiving with a differential signal. And a communication system including the cable device.
  • the cable device is a vehicle cable device in which a signal is transmitted by a coaxial cable.
  • a differential signal is input, and the input differential signal is converted into a single signal with a fixed potential as a reference.
  • a first converter that outputs the converted single signal to the coaxial cable, and a second converter that converts the single signal output from the coaxial cable into a differential signal.
  • the differential signal input from the outside is converted into a single signal based on a fixed potential, and the converted single signal is output to the coaxial cable.
  • a single signal is transmitted by a coaxial cable.
  • a single signal output from a coaxial cable is converted into a differential signal.
  • the inner conductor is usually covered with the outer conductor, and a single signal is output to the inner conductor. Since the inner conductor is shielded from external electromagnetic waves by the outer conductor, disturbance noise is not superimposed on a single signal. For this reason, while a single signal is transmitted through the coaxial cable, the signal waveform is not distorted by disturbance noise, and high-speed communication with a high bit rate is realized. Further, in the coaxial cable, unlike the twisted pair cable, since two conductors are not used for signal transmission, the device is light and small.
  • the cable device is characterized in that it has a housing in which the first conversion unit or the second conversion unit is accommodated, and further includes a connector connected to the coaxial cable.
  • the first converter for converting the differential signal into a single signal and outputting the converted single signal to the coaxial cable in the housing of the connector connected to the coaxial cable, or the single A second converter for converting a signal into a differential signal is accommodated.
  • the transmission distance of the single signal from the 1st conversion part to a coaxial cable or the transmission distance of the single signal from a coaxial cable to the 2nd conversion part is short.
  • the waveform is greatly distorted by the superposition of disturbance noise as compared with a differential signal.
  • the transmission distance from the first converter to the coaxial cable is short, the probability that disturbance noise is superimposed on a single signal between the first converter and the coaxial cable is low.
  • the transmission distance from the coaxial cable to the second converter is short, the probability that disturbance noise is superimposed on a single signal between the coaxial cable and the second converter is low.
  • the casing is configured by a conductor
  • the coaxial cable includes an inner conductor from which the single signal is output by the first converter, and an outer conductor that covers the inner conductor.
  • the housing is in contact with the outer conductor.
  • the inner conductor in the coaxial cable, the inner conductor is covered with the outer conductor, and a single signal is output to the inner conductor.
  • the housing is made of a conductor and is in contact with the outer conductor. For this reason, the potential of the housing can be used as the fixed potential.
  • the 1st conversion part or the 2nd conversion part is accommodated in the housing
  • a communication system includes the cable device described above and a plurality of communication devices that transmit and receive differential signals to and from each other via the cable device.
  • the plurality of communication devices mutually transmit and receive differential signals via the cable device.
  • a light and small cable device capable of realizing high-speed communication without changing an existing communication configuration for transmitting and receiving with a differential signal, and a communication system including the cable device are realized. be able to.
  • FIG. 1 is a block diagram of a communication system 1 in the present embodiment.
  • the communication system 1 is suitably mounted on a vehicle and includes a cable device 2 and two communication devices 3 and 3. Each of the communication devices 3 and 3 is connected to the cable device 2 by two conducting wires 40 and 41.
  • the communication device 3 transmits a differential signal corresponding to “0” of digital data, for example, by applying a predetermined voltage, for example, a voltage of 1 V or more, between the two conductors 40 and 41.
  • the communication device 3 transmits a differential signal corresponding to “1” of digital data, for example, by applying a voltage lower than a predetermined voltage between the two conductors 40 and 41.
  • the communication device 3 receives a differential signal by detecting a voltage between the two conductors 40 and 41. When the voltage between the two conducting wires 40 and 41 is equal to or higher than a predetermined voltage, the communication device 3 receives a differential signal corresponding to “0” of digital data, for example. When the voltage between the two conductors 40 and 41 is less than a predetermined voltage, the communication device 3 receives a differential signal corresponding to “1” of digital data, for example.
  • the two communication devices 3 and 3 are configured in the same manner, and transmit / receive differential signals to / from each other via the cable device 2 according to a protocol such as Ethernet (registered trademark) or CAN (Controller Area Network).
  • the cable device 2 has two connectors 5 and 5 and a coaxial cable 6.
  • the two connectors 5 and 5 are similarly configured, and FIG. 1 shows a cross section of the connectors 5 and 5 and the coaxial cable 6.
  • the connector 5 is connected to the communication device 3 and one end of the coaxial cable 6.
  • the coaxial cable 6 is connected between the two connectors 5 and 5.
  • FIG. 2 is an external view of the connector 5.
  • the connector 5 has a hollow housing 50 having a rectangular parallelepiped outer shape.
  • the housing 50 is made of a conductor such as copper or aluminum.
  • a cylindrical connection portion 50a protrudes from one surface of the housing 50 in a direction substantially perpendicular to the one surface. As shown in FIG. 1, the hole of the connection portion 50 a penetrates in the direction substantially perpendicular to one surface of the casing 50 described above and communicates with the inside of the casing 50.
  • FIG. 3 is an external view of the coaxial cable 6.
  • the rod-shaped inner conductor 60 is surrounded by an insulator 61 (see FIG. 1) in a close contact state.
  • the outside of the insulator 61 is surrounded by a cylindrical outer conductor 62 in a close contact state.
  • the inner conductor 60 protrudes from the insulator 61 at both ends of the coaxial cable 6.
  • the outer conductor 62 spreads outward at both ends of the coaxial cable 6 and covers the protruding portion of the inner conductor 60 with a gap therebetween.
  • Both end portions of the coaxial cable 6 are connected to the connector 5 so that the outer conductor 62 covers the outer peripheral surface of the connection portion 50a of the housing 50 in a close contact state. At this time, since the outer conductor 62 is in contact with the connecting portion 50a, the potentials of the housing 50 and the outer conductor 62 are matched or substantially matched.
  • the coaxial cable 6 is preferably a very fine coaxial cable having flexibility and bending resistance.
  • the cable device 2 further includes a signal converter 7 in the housing 50 of each of the two connectors 5 and 5.
  • the signal converter 7 is connected to the communication device 3 by two conductive wires 40 and 41, connected to the housing 50 by a conductive wire 42, and connected to the inner conductor 60 of the coaxial cable 6 by a conductive wire 43.
  • FIG. 4 is a circuit diagram of the signal converter 7.
  • the signal converter 7 is a so-called balun and has a chip shape.
  • the signal converter 7 has a transformer 70.
  • One coil of the transformer 70 has one end connected to the communication device 3 by a conducting wire 40 and the other end connected to the inner conductor 60 of the coaxial cable 6 by a conducting wire 43.
  • One end of the other coil of the transformer 70 is connected to the communication device 3 by a conducting wire 41 and the other end is connected to the housing 50 by a conducting wire 42.
  • the transformer 70 is a passive element.
  • a differential signal is input to the transformer 70 from the communication device 3 via the two conducting wires 40 and 41.
  • the transformer 70 converts the input differential signal into a single signal based on the potential (fixed potential) of the housing 50, and the converted single signal is the coaxial cable 6. Is output to the inner conductor 60.
  • the potentials of the casing 50 and the outer conductor 62 of the coaxial cable 6 are the same or substantially the same. Therefore, the potential of the housing 50 is used as a fixed potential that serves as a reference in the conversion of a single signal.
  • a single signal is output from the inner conductor 60 of the coaxial cable 6 to the transformer 70 via the conductor 43.
  • the transformer 70 converts the single signal into a differential signal, and outputs the converted differential signal to the communication device 3 via the two conductors 40 and 41.
  • the signal converter 7 functions as a first conversion unit and a second conversion unit.
  • bidirectional communication is performed between the two communication devices 3 and 3.
  • One communication device 3 outputs the differential signal to one signal converter 7, thereby transmitting the differential signal to the other communication device 3.
  • the transformer 70 of one signal converter 7 converts the differential signal input from the one communication device 3 into a single signal, and outputs the converted single signal to the inner conductor 60 of the coaxial cable 6.
  • a single signal output to the inner conductor 60 is transmitted by the coaxial cable 6.
  • the transmitted single signal is output to the transformer 70 of the other signal converter 7.
  • the transformer 70 converts an input single signal into a differential signal, and outputs the converted differential signal to the other communication device 3 via the two conducting wires 40 and 41.
  • the other communication device 3 receives the differential signal by detecting the voltage between the two conductors 40 and 41.
  • the communication device 3 since differential signals are input and output via the cable device 2, there is no need to change the existing communication configuration for transmitting and receiving differential signals. Specifically, an existing communication device that transmits and receives a differential signal via a twisted pair cable can be used as the communication device 3.
  • the inner conductor 60 is covered with the outer conductor 62 and shielded from external electromagnetic waves. For this reason, disturbance noise is not superimposed on the single signal transmitted through the coaxial cable 6, and the waveform of the single signal is not distorted by the disturbance noise while the single signal is transmitted through the coaxial cable 6. Therefore, high-speed communication with a high bit rate can be realized. Further, in the coaxial cable 6, unlike the twisted pair cable, since the two conductors are not used for signal transmission, the cable device 2 is light and small.
  • the waveform is greatly distorted due to superposition of disturbance noise compared to differential signals.
  • the signal converter 7 since the signal converter 7 is accommodated in the housing 50 of the connector 5, the signal conversion is compared with the communication system when the signal converter 7 is mounted on the communication device 3.
  • the propagation distance of a single signal to the device 7 and the coaxial cable 6 is short. Therefore, the probability that disturbance noise is superimposed on a single signal between the signal converter 7 and the coaxial cable 6 is low.
  • the housing 50 in which the signal converter 7 is accommodated is constituted by a conductor, the conductive wire 43 connecting the signal converter 7 and the inner conductor 60 of the coaxial cable 6 is shielded from external electromagnetic waves. . Therefore, the probability that disturbance noise is superimposed on a single signal between the signal converter 7 and the coaxial cable 6 is even lower.
  • the housing 50 of the connector 5 is coaxial.
  • the outer conductor 62 of the cable 6 may not be electrically connected, and the housing 50 may not be formed of a conductor.
  • the signal converter 7 may not be housed in the housing 50 of the connector 5 but may be disposed outside the housing 50.
  • the cable device 2 does not need to change the existing communication configuration for transmitting and receiving differential signals, can realize high-speed communication, and the cable device 2 is light. And small.
  • the signal converter 7 only needs to be configured to be able to convert between a differential signal and a single signal. For this reason, as long as it is possible to convert between a differential signal and a single signal, the connection of the transformer 70 included in the signal converter 7 is not limited to the connection described above, and the configuration of the signal converter 7 is The configuration using the transformer 70 is not limited.
  • the number of communication devices 3 included in the communication system 1 is not limited to 2, and may be 3 or more.
  • the cable device 2 is configured using the coaxial cable 6 having three or more ends and the three or more connectors 5, 5,... The devices are connected to each other by this cable device 2.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Dc Digital Transmission (AREA)

Abstract

Provided are a light, compact cable device with which it is possible to achieve high-speed communication without changing the existing communication configuration for transmitting and receiving using differential signals, and a communication system provided with the cable device. In the cable device 2, differential signals are inputted from a communication device 3 to a signal converter 7. The signal converter 7 converts the input differential signals into unitary signals using a fixed potential as a reference, and outputs the converted single signals to a coaxial cable 6. The unitary signals are transferred via the coaxial cable 6. The signal converter 7 also converts the unitary signals outputted from the coaxial cable 6 to differential signals, and outputs the converted differential signals to the communication device 3.

Description

ケーブル装置及び通信システムCable apparatus and communication system
　本発明は、信号が伝送されるケーブル装置、及び、該ケーブル装置を備える通信システムに関する。 The present invention relates to a cable device for transmitting a signal and a communication system including the cable device.
　車両には、複数の通信装置、例えば、電子機器を制御する複数の電子制御装置(Electronic Control Unit; ECU)が互いに通信する通信システム（例えば、特許文献１参照）が搭載されている。特許文献１に記載の通信システムでは、複数の通信装置は、撚り合わされた２本の導線を有するツイストペアケーブルによって相互に接続されている。 The vehicle is equipped with a communication system (for example, refer to Patent Document 1) in which a plurality of communication devices, for example, a plurality of electronic control units (Electronic Control Units) that control electronic devices communicate with each other. In the communication system described in Patent Document 1, a plurality of communication devices are connected to each other by a twisted pair cable having two twisted conductors.
　複数の通信装置夫々は、２本の導線間に所定電圧、例えば１Ｖ以上の電圧、又は、所定電圧未満の電圧を印加することによって、ツイストペアケーブルを介して差動信号を送信する。複数の通信装置夫々は、２本の導線間の電圧を検出することによって、ツイストペアケーブルを介して差動信号を受信する。 Each of the plurality of communication devices transmits a differential signal via a twisted pair cable by applying a predetermined voltage, for example, a voltage of 1 V or more, or a voltage lower than the predetermined voltage, between the two conductors. Each of the plurality of communication devices receives a differential signal via a twisted pair cable by detecting a voltage between two conductors.
特開２０１５－９０９９７号公報Japanese Patent Laying-Open No. 2015-90997
　特許文献１に記載されているような従来の通信システムの中には、容量が大きいデータ、例えば、カメラによって撮像された映像に係るデータが複数の通信装置間で送受信される通信システムがある。この通信システムでは、ビットレートが高い差動信号を用いた高速通信が行われる。 Among conventional communication systems as described in Patent Document 1, there is a communication system in which large-capacity data, for example, data related to video captured by a camera is transmitted and received between a plurality of communication devices. In this communication system, high-speed communication using a differential signal having a high bit rate is performed.
　高速通信が行われた場合、差動信号の１ビットの期間が短いため、外乱ノイズによって生じる信号波形の歪によってデータが誤って検出される確率が高く、データの検出に与える外乱ノイズの影響が大きい。このため、外乱ノイズによって生じる信号波形の歪みを防止する必要がある。この歪みを防止するため、高速通信では、２本の導線が導体によって覆われたシールド付のツイストペアケーブルが用いられている。 When high-speed communication is performed, since the 1-bit period of the differential signal is short, there is a high probability that data is erroneously detected due to signal waveform distortion caused by disturbance noise, and the influence of disturbance noise on data detection is large. For this reason, it is necessary to prevent distortion of the signal waveform caused by disturbance noise. In order to prevent this distortion, a shielded twisted pair cable in which two conductors are covered with a conductor is used in high-speed communication.
　シールド付のツイストペアケーブルでは、導体によって、２本の導線が外部の電磁波から遮蔽されているので、外乱ノイズによって差動信号の波形が歪むことはない。
　しかしながら、シールド付のツイストペアケーブルには、２本の導線が導体によって覆われているため、重くて大型であるという問題がある。 In a shielded twisted pair cable, two conductors are shielded from external electromagnetic waves by a conductor, so that the waveform of the differential signal is not distorted by disturbance noise.
However, a twisted pair cable with a shield has a problem that it is heavy and large because two conductors are covered with a conductor.
　本発明は斯かる事情に鑑みてなされたものであり、その目的とするところは、差動信号で送受信を行う既存の通信構成を変更することなく、高速通信を実現することができる軽くて小型のケーブル装置、及び、該ケーブル装置を備える通信システムを提供することにある。 The present invention has been made in view of such circumstances, and an object of the present invention is to provide a light and small size capable of realizing high-speed communication without changing an existing communication configuration for transmitting and receiving with a differential signal. And a communication system including the cable device.
　本発明に係るケーブル装置は、同軸ケーブルによって信号が伝送される車両用のケーブル装置において、差動信号が入力され、入力された該差動信号を、固定電位を基準とした単一信号に変換し、変換した単一信号を前記同軸ケーブルに出力する第１変換部と、該同軸ケーブルから出力された前記単一信号を差動信号に変換する第２変換部とを備えることを特徴とする。 The cable device according to the present invention is a vehicle cable device in which a signal is transmitted by a coaxial cable. A differential signal is input, and the input differential signal is converted into a single signal with a fixed potential as a reference. And a first converter that outputs the converted single signal to the coaxial cable, and a second converter that converts the single signal output from the coaxial cable into a differential signal. .
　本発明にあっては、外部から入力された差動信号を、固定電位を基準とした単一信号に変換し、変換した単一信号を同軸ケーブルに出力する。これにより、単一信号が同軸ケーブルによって伝送される。同軸ケーブルから出力された単一信号を差動信号に変換する。 In the present invention, the differential signal input from the outside is converted into a single signal based on a fixed potential, and the converted single signal is output to the coaxial cable. Thereby, a single signal is transmitted by a coaxial cable. A single signal output from a coaxial cable is converted into a differential signal.
　従って、装置を介して差動信号の入出力が行われるため、差動信号の送受信を行う既存の通信構成を変更する必要はない。また、同軸ケーブルは、通常、内部導体が外部導体によって覆われており、単一信号は内部導体に出力される。内部導体は、外部導体によって外部の電磁波から遮蔽されているので、単一信号に外乱ノイズが重畳されない。このため、単一信号が同軸ケーブルを伝送している間に、外乱ノイズによって信号波形が歪むことはなく、ビットレートが高い高速通信が実現される。更に、同軸ケーブルでは、ツイストペアケーブルのように、信号の伝送に２本の導線が用いられていないため、装置は軽くて小型である。 Therefore, since differential signals are input and output through the device, there is no need to change the existing communication configuration for transmitting and receiving differential signals. Further, in the coaxial cable, the inner conductor is usually covered with the outer conductor, and a single signal is output to the inner conductor. Since the inner conductor is shielded from external electromagnetic waves by the outer conductor, disturbance noise is not superimposed on a single signal. For this reason, while a single signal is transmitted through the coaxial cable, the signal waveform is not distorted by disturbance noise, and high-speed communication with a high bit rate is realized. Further, in the coaxial cable, unlike the twisted pair cable, since two conductors are not used for signal transmission, the device is light and small.
　本発明に係るケーブル装置は、前記第１変換部又は第２変換部が収容される筐体を有し、前記同軸ケーブルに接続されるコネクタを更に備えることを特徴とする。 The cable device according to the present invention is characterized in that it has a housing in which the first conversion unit or the second conversion unit is accommodated, and further includes a connector connected to the coaxial cable.
　本発明にあっては、同軸ケーブルに接続されるコネクタの筐体内に、差動信号を単一信号に変換し、変換した単一信号を同軸ケーブルに出力する第１変換部、又は、単一信号を差動信号に変換する第２変換部が収容されている。このため、第１変換部から同軸ケーブルまでの単一信号の伝送距離、又は、同軸ケーブルから第２変換部までの単一信号の伝送距離が短い。単一信号については、差動信号と比較して、外乱ノイズの重畳によって波形が大きく歪む。第１変換部から同軸ケーブルまで伝送距離が短い場合、第１変換部及び同軸ケーブルの間で単一信号に外乱ノイズが重畳する確率は低い。同軸ケーブルから第２変換部までの伝送距離が短い場合、同軸ケーブル及び第２変換部の間で単一信号に外乱ノイズが重畳する確率は低い。 In the present invention, the first converter for converting the differential signal into a single signal and outputting the converted single signal to the coaxial cable in the housing of the connector connected to the coaxial cable, or the single A second converter for converting a signal into a differential signal is accommodated. For this reason, the transmission distance of the single signal from the 1st conversion part to a coaxial cable or the transmission distance of the single signal from a coaxial cable to the 2nd conversion part is short. As for a single signal, the waveform is greatly distorted by the superposition of disturbance noise as compared with a differential signal. When the transmission distance from the first converter to the coaxial cable is short, the probability that disturbance noise is superimposed on a single signal between the first converter and the coaxial cable is low. When the transmission distance from the coaxial cable to the second converter is short, the probability that disturbance noise is superimposed on a single signal between the coaxial cable and the second converter is low.
　本発明に係るケーブル装置は、前記筐体は導体によって構成されており、前記同軸ケーブルは、前記第１変換部によって前記単一信号が出力される内部導体と、該内部導体を覆う外部導体とを有し、前記筐体は前記外部導体に接触していることを特徴とする。 In the cable device according to the present invention, the casing is configured by a conductor, and the coaxial cable includes an inner conductor from which the single signal is output by the first converter, and an outer conductor that covers the inner conductor. The housing is in contact with the outer conductor.
　本発明にあっては、同軸ケーブルでは、内部導体は外部導体によって覆われており、内部導体には単一信号が出力される。筐体は、導体によって構成されており、外部導体に接触している。このため、固定電位として、筐体の電位を用いることが可能である。また、導体によって構成された筐体内に第１変換部又は第２変換部が収容されているため、第１変換部及び同軸ケーブル間、又は、同軸ケーブル及び第２変換部間で単一信号に外乱ノイズが重畳する確率は更に低い。 In the present invention, in the coaxial cable, the inner conductor is covered with the outer conductor, and a single signal is output to the inner conductor. The housing is made of a conductor and is in contact with the outer conductor. For this reason, the potential of the housing can be used as the fixed potential. Moreover, since the 1st conversion part or the 2nd conversion part is accommodated in the housing | casing comprised with the conductor, it becomes a single signal between a 1st conversion part and a coaxial cable, or between a coaxial cable and a 2nd conversion part. The probability that disturbance noise is superimposed is even lower.
　本発明に係る通信システムは、前述したケーブル装置と、該ケーブル装置を介して差動信号を相互に送受信する複数の通信装置とを備えることを特徴とする。 A communication system according to the present invention includes the cable device described above and a plurality of communication devices that transmit and receive differential signals to and from each other via the cable device.
　本発明にあっては、複数の通信装置は、ケーブル装置を介して差動信号を相互に送受信する。 In the present invention, the plurality of communication devices mutually transmit and receive differential signals via the cable device.
　本発明によれば、差動信号で送受信を行う既存の通信構成を変更することなく、高速通信を実現することができる軽くて小型のケーブル装置と、該ケーブル装置を備える通信システムとを実現することができる。 According to the present invention, a light and small cable device capable of realizing high-speed communication without changing an existing communication configuration for transmitting and receiving with a differential signal, and a communication system including the cable device are realized. be able to.
本実施の形態における通信システムのブロック図である。It is a block diagram of the communication system in this Embodiment. コネクタの外観図である。It is an external view of a connector. 同軸ケーブルの外観図である。It is an external view of a coaxial cable. 信号変換器の回路図である。It is a circuit diagram of a signal converter.
　以下、本発明をその実施の形態を示す図面に基づいて詳述する。
　図１は本実施の形態における通信システム１のブロック図である。通信システム１は、車両に好適に搭載され、ケーブル装置２及び２つの通信装置３，３を備える。通信装置３，３夫々は、２本の導線４０，４１によってケーブル装置２に接続されている。 Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
FIG. 1 is a block diagram of a communication system 1 in the present embodiment. The communication system 1 is suitably mounted on a vehicle and includes a cable device 2 and two communication devices 3 and 3. Each of the communication devices 3 and 3 is connected to the cable device 2 by two conducting wires 40 and 41.
　通信装置３は、２本の導線４０，４１間に所定電圧、例えば１Ｖ以上の電圧を印加することによって、例えばデジタルデータの「０」に対応する差動信号を送信する。通信装置３は、２本の導線４０，４１間に所定電圧未満の電圧を印加することによって、例えばデジタルデータの「１」に対応する差動信号を送信する。 The communication device 3 transmits a differential signal corresponding to “0” of digital data, for example, by applying a predetermined voltage, for example, a voltage of 1 V or more, between the two conductors 40 and 41. The communication device 3 transmits a differential signal corresponding to “1” of digital data, for example, by applying a voltage lower than a predetermined voltage between the two conductors 40 and 41.
　通信装置３は、２本の導線４０，４１間の電圧を検出することによって差動信号を受信する。通信装置３は、２本の導線４０，４１間の電圧が所定電圧以上である場合、例えばデジタルデータの「０」に対応する差動信号を受信する。通信装置３は、２本の導線４０，４１間の電圧が所定電圧未満である場合、例えばデジタルデータの「１」に対応する差動信号を受信する。
　２つの通信装置３，３は、同様に構成されており、イーサネット（登録商標）又はＣＡＮ(Controller Area Network)等のプロトコルに従って、ケーブル装置２を介して相互に差動信号を送受信する。 The communication device 3 receives a differential signal by detecting a voltage between the two conductors 40 and 41. When the voltage between the two conducting wires 40 and 41 is equal to or higher than a predetermined voltage, the communication device 3 receives a differential signal corresponding to “0” of digital data, for example. When the voltage between the two conductors 40 and 41 is less than a predetermined voltage, the communication device 3 receives a differential signal corresponding to “1” of digital data, for example.
The two communication devices 3 and 3 are configured in the same manner, and transmit / receive differential signals to / from each other via the cable device 2 according to a protocol such as Ethernet (registered trademark) or CAN (Controller Area Network).
　ケーブル装置２は２つのコネクタ５，５及び同軸ケーブル６を有する。２つのコネクタ５，５は同様に構成され、図１には、コネクタ５，５及び同軸ケーブル６の断面が示されている。コネクタ５は、通信装置３と同軸ケーブル６の一端部とに接続される。同軸ケーブル６は２つのコネクタ５，５間に接続されている。 The cable device 2 has two connectors 5 and 5 and a coaxial cable 6. The two connectors 5 and 5 are similarly configured, and FIG. 1 shows a cross section of the connectors 5 and 5 and the coaxial cable 6. The connector 5 is connected to the communication device 3 and one end of the coaxial cable 6. The coaxial cable 6 is connected between the two connectors 5 and 5.
　図２はコネクタ５の外観図である。コネクタ５は直方体の外形形状を有する中空の筐体５０を有する。筐体５０は、銅又はアルミニウム等の導体によって構成されている。筐体５０の一面から、該一面に略垂直な方向に筒状の接続部５０ａが突出している。接続部５０ａの孔は、図１に示すように、前述した筐体５０の一面に略垂直な方向に貫通し、筐体５０内に連通している。 FIG. 2 is an external view of the connector 5. The connector 5 has a hollow housing 50 having a rectangular parallelepiped outer shape. The housing 50 is made of a conductor such as copper or aluminum. A cylindrical connection portion 50a protrudes from one surface of the housing 50 in a direction substantially perpendicular to the one surface. As shown in FIG. 1, the hole of the connection portion 50 a penetrates in the direction substantially perpendicular to one surface of the casing 50 described above and communicates with the inside of the casing 50.
　図３は同軸ケーブル６の外観図である。同軸ケーブル６では、棒状の内部導体６０は、絶縁体６１（図１参照）によって密着状態で囲繞されている。絶縁体６１の外側は、円筒状の外部導体６２によって密着状態で囲繞されている。同軸ケーブル６の両端部では、内部導体６０は絶縁体６１から突出している。外部導体６２は、同軸ケーブル６の両端部において、外側に広がっており、内部導体６０の突出部分を、間隔を空けて覆っている。 FIG. 3 is an external view of the coaxial cable 6. In the coaxial cable 6, the rod-shaped inner conductor 60 is surrounded by an insulator 61 (see FIG. 1) in a close contact state. The outside of the insulator 61 is surrounded by a cylindrical outer conductor 62 in a close contact state. The inner conductor 60 protrudes from the insulator 61 at both ends of the coaxial cable 6. The outer conductor 62 spreads outward at both ends of the coaxial cable 6 and covers the protruding portion of the inner conductor 60 with a gap therebetween.
　同軸ケーブル６の両端部夫々は、外部導体６２が筐体５０の接続部５０ａの外周面を密着状態で覆うように、コネクタ５に接続される。このとき、外部導体６２は接続部５０ａに接触しているため、筐体５０及び外部導体６２の電位は一致しているか又は略一致している。
　なお、同軸ケーブル６は柔軟性及び耐屈曲性を有する極細同軸ケーブルであることが好ましい。 Both end portions of the coaxial cable 6 are connected to the connector 5 so that the outer conductor 62 covers the outer peripheral surface of the connection portion 50a of the housing 50 in a close contact state. At this time, since the outer conductor 62 is in contact with the connecting portion 50a, the potentials of the housing 50 and the outer conductor 62 are matched or substantially matched.
The coaxial cable 6 is preferably a very fine coaxial cable having flexibility and bending resistance.
　ケーブル装置２は、２つのコネクタ５，５夫々の筐体５０内に信号変換器７を更に有する。信号変換器７は、２本の導線４０，４１によって通信装置３に接続され、導線４２によって筐体５０に接続され、導線４３によって同軸ケーブル６の内部導体６０に接続されている。 The cable device 2 further includes a signal converter 7 in the housing 50 of each of the two connectors 5 and 5. The signal converter 7 is connected to the communication device 3 by two conductive wires 40 and 41, connected to the housing 50 by a conductive wire 42, and connected to the inner conductor 60 of the coaxial cable 6 by a conductive wire 43.
　図４は信号変換器７の回路図である。信号変換器７は、所謂バランであり、チップ状をなす。信号変換器７はトランス７０を有する。トランス７０の一方のコイルについて、一端は導線４０によって通信装置３に接続され、他端は導線４３によって同軸ケーブル６の内部導体６０に接続されている。トランス７０の他方のコイルについて、一端は導線４１によって通信装置３に接続され、他端は導線４２によって筐体５０に接続されている。 FIG. 4 is a circuit diagram of the signal converter 7. The signal converter 7 is a so-called balun and has a chip shape. The signal converter 7 has a transformer 70. One coil of the transformer 70 has one end connected to the communication device 3 by a conducting wire 40 and the other end connected to the inner conductor 60 of the coaxial cable 6 by a conducting wire 43. One end of the other coil of the transformer 70 is connected to the communication device 3 by a conducting wire 41 and the other end is connected to the housing 50 by a conducting wire 42.
　トランス７０は受動素子である。トランス７０には、差動信号が、２本の導線４０，４１を介して通信装置３から入力される。トランス７０は、差動信号が入力された場合、入力された差動信号を、筐体５０の電位（固定電位）を基準とした単一信号に変換し、変換した単一信号を同軸ケーブル６の内部導体６０に出力する。 The transformer 70 is a passive element. A differential signal is input to the transformer 70 from the communication device 3 via the two conducting wires 40 and 41. When the differential signal is input, the transformer 70 converts the input differential signal into a single signal based on the potential (fixed potential) of the housing 50, and the converted single signal is the coaxial cable 6. Is output to the inner conductor 60.
　前述したように、２つのコネクタ夫々が有する筐体５０と、同軸ケーブル６の外部導体６２とが接触しているため、筐体５０及び外部導体６２の電位が同じ又は略同じである。従って、筐体５０の電位が、単一信号の変換において基準となる固定電位として用いられている。 As described above, since the casing 50 of each of the two connectors and the outer conductor 62 of the coaxial cable 6 are in contact with each other, the potentials of the casing 50 and the outer conductor 62 are the same or substantially the same. Therefore, the potential of the housing 50 is used as a fixed potential that serves as a reference in the conversion of a single signal.
　また、単一信号が、同軸ケーブル６の内部導体６０から導線４３を介してトランス７０へ出力される。トランス７０は、内部導体６０から単一信号が入力された場合、単一信号を差動信号に変換し、変換した差動信号を２本の導線４０，４１を介して通信装置３に出力する。
　信号変換器７は第１変換部及び第２変換部として機能する。 A single signal is output from the inner conductor 60 of the coaxial cable 6 to the transformer 70 via the conductor 43. When a single signal is input from the internal conductor 60, the transformer 70 converts the single signal into a differential signal, and outputs the converted differential signal to the communication device 3 via the two conductors 40 and 41. .
The signal converter 7 functions as a first conversion unit and a second conversion unit.
　以上のように構成された通信システム１では、２つの通信装置３，３間で双方向の通信が行われる。一方の通信装置３は、差動信号を一方の信号変換器７に出力することによって、差動信号を他方の通信装置３に送信する。一方の信号変換器７のトランス７０は、一方の通信装置３から入力された差動信号を単一信号に変換し、変換した単一信号を同軸ケーブル６の内部導体６０に出力する。内部導体６０に出力された単一信号は同軸ケーブル６によって伝送される。伝送された単一信号は、他方の信号変換器７のトランス７０に出力される。このトランス７０は、入力された単一信号を差動信号に変換し、変換した差動信号を２本の導線４０，４１を介して他方の通信装置３に出力する。他方の通信装置３は、２本の導線４０，４１間の電圧を検出することによって差動信号を受信する。 In the communication system 1 configured as described above, bidirectional communication is performed between the two communication devices 3 and 3. One communication device 3 outputs the differential signal to one signal converter 7, thereby transmitting the differential signal to the other communication device 3. The transformer 70 of one signal converter 7 converts the differential signal input from the one communication device 3 into a single signal, and outputs the converted single signal to the inner conductor 60 of the coaxial cable 6. A single signal output to the inner conductor 60 is transmitted by the coaxial cable 6. The transmitted single signal is output to the transformer 70 of the other signal converter 7. The transformer 70 converts an input single signal into a differential signal, and outputs the converted differential signal to the other communication device 3 via the two conducting wires 40 and 41. The other communication device 3 receives the differential signal by detecting the voltage between the two conductors 40 and 41.
　通信システム１では、ケーブル装置２を介して差動信号の入出力が行われるため、差動信号の送受信を行う既存の通信構成を変更する必要はない。具体的には、通信装置３として、ツイストペアケーブルを介して差動信号の送受信を行う既存の通信装置を用いることができる。 In the communication system 1, since differential signals are input and output via the cable device 2, there is no need to change the existing communication configuration for transmitting and receiving differential signals. Specifically, an existing communication device that transmits and receives a differential signal via a twisted pair cable can be used as the communication device 3.
　また、同軸ケーブル６では、内部導体６０が外部導体６２によって覆われ、外部の電磁波から遮蔽されている。このため、同軸ケーブル６を伝送する単一信号に外乱ノイズが重畳されず、単一信号が同軸ケーブル６を伝送している間に外乱ノイズによって単一信号の波形が歪むことはない。従って、ビットレートが高い高速通信を実現することができる。
　更に、同軸ケーブル６では、ツイストペアケーブルのように、信号の伝送に２本の導線が用いられていないため、ケーブル装置２は軽くて小型である。 In the coaxial cable 6, the inner conductor 60 is covered with the outer conductor 62 and shielded from external electromagnetic waves. For this reason, disturbance noise is not superimposed on the single signal transmitted through the coaxial cable 6, and the waveform of the single signal is not distorted by the disturbance noise while the single signal is transmitted through the coaxial cable 6. Therefore, high-speed communication with a high bit rate can be realized.
Further, in the coaxial cable 6, unlike the twisted pair cable, since the two conductors are not used for signal transmission, the cable device 2 is light and small.
　単一信号については、差動信号と比較して、外乱ノイズの重畳によって波形が大きく歪む。しかしながら、通信システム１では、コネクタ５の筐体５０内に信号変換器７が収容されているため、信号変換器７が通信装置３に搭載されている場合の通信システムと比較して、信号変換器７及び同軸ケーブル６までの単一信号の伝播距離は短い。従って、信号変換器７及び同軸ケーブル６の間で、単一信号に外乱ノイズが重畳する確率は低い。 For single signals, the waveform is greatly distorted due to superposition of disturbance noise compared to differential signals. However, in the communication system 1, since the signal converter 7 is accommodated in the housing 50 of the connector 5, the signal conversion is compared with the communication system when the signal converter 7 is mounted on the communication device 3. The propagation distance of a single signal to the device 7 and the coaxial cable 6 is short. Therefore, the probability that disturbance noise is superimposed on a single signal between the signal converter 7 and the coaxial cable 6 is low.
　更に、信号変換器７が収容されている筐体５０は導体によって構成されているため、信号変換器７と同軸ケーブル６の内部導体６０とを接続する導線４３は外部の電磁波から遮蔽されている。従って、信号変換器７及び同軸ケーブル６の間で、単一信号に外乱ノイズが重畳する確率は更に低い。 Furthermore, since the housing 50 in which the signal converter 7 is accommodated is constituted by a conductor, the conductive wire 43 connecting the signal converter 7 and the inner conductor 60 of the coaxial cable 6 is shielded from external electromagnetic waves. . Therefore, the probability that disturbance noise is superimposed on a single signal between the signal converter 7 and the coaxial cable 6 is even lower.
　なお、トランス７０が差動信号を単一信号に変換する場合に基準となる固定電位が同軸ケーブル６の外部導体６２の電位と同じ又は略同じであれば、コネクタ５の筐体５０は、同軸ケーブル６の外部導体６２に導通していなくてもよく、更に、筐体５０は導体で構成されていなくてもよい。また、信号変換器７は、コネクタ５の筐体５０内に収容されず、筐体５０の外側に配置されていてもよい。 When the transformer 70 converts the differential signal into a single signal, if the fixed potential serving as a reference is the same or substantially the same as the potential of the outer conductor 62 of the coaxial cable 6, the housing 50 of the connector 5 is coaxial. The outer conductor 62 of the cable 6 may not be electrically connected, and the housing 50 may not be formed of a conductor. Further, the signal converter 7 may not be housed in the housing 50 of the connector 5 but may be disposed outside the housing 50.
　以上のように構成された場合であっても、ケーブル装置２では、差動信号の送受信を行う既存の通信構成を変更する必要はなく、高速通信を実現することができ、ケーブル装置２は軽くて小型である。 Even in the case configured as described above, the cable device 2 does not need to change the existing communication configuration for transmitting and receiving differential signals, can realize high-speed communication, and the cable device 2 is light. And small.
　信号変換器７は、差動信号及び単一信号間の変換を行うことが可能に構成されていればよい。このため、差動信号及び単一信号間の変換を行うことが可能であれば、信号変換器７が有するトランス７０の接続は前述した接続に限定されず、更に、信号変換器７の構成はトランス７０を用いた構成に限定されない。 The signal converter 7 only needs to be configured to be able to convert between a differential signal and a single signal. For this reason, as long as it is possible to convert between a differential signal and a single signal, the connection of the transformer 70 included in the signal converter 7 is not limited to the connection described above, and the configuration of the signal converter 7 is The configuration using the transformer 70 is not limited.
　また、通信システム１が有する通信装置３の数は２に限定されず、３以上であってもよい。この場合、例えば、ケーブル装置２は、内部導体６０が分岐され、３以上の端部を有する同軸ケーブル６と３以上のコネクタ５，５，・・・とを用いて構成され、３以上の通信装置がこのケーブル装置２によって相互に接続される。 Further, the number of communication devices 3 included in the communication system 1 is not limited to 2, and may be 3 or more. In this case, for example, the cable device 2 is configured using the coaxial cable 6 having three or more ends and the three or more connectors 5, 5,... The devices are connected to each other by this cable device 2.
　開示された実施の形態は、全ての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は上述の説明ではなく請求の範囲によって示され、請求の範囲と均等の意味及び範囲内での全ての変更が含まれることが意図される。 The disclosed embodiments should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
　１　通信システム
　２　ケーブル装置
　３　通信装置
　５　コネクタ
　５０　筐体
　６　同軸ケーブル
　６０　内部導体
　６２　外部導体
　７　信号変換器（第１変換部、第２変換部） DESCRIPTION OF SYMBOLS 1 Communication system 2 Cable apparatus 3 Communication apparatus 5 Connector 50 Case 6 Coaxial cable 60 Inner conductor 62 Outer conductor 7 Signal converter (1st conversion part, 2nd conversion part)

Claims (4)

  1. 　同軸ケーブルによって信号が伝送される車両用のケーブル装置において、
    　差動信号が入力され、入力された該差動信号を、固定電位を基準とした単一信号に変換し、変換した単一信号を前記同軸ケーブルに出力する第１変換部と、
    　該同軸ケーブルから出力された前記単一信号を差動信号に変換する第２変換部と
    　を備えることを特徴とするケーブル装置。     In a cable device for a vehicle in which a signal is transmitted by a coaxial cable,
    A first converter that receives a differential signal, converts the input differential signal into a single signal based on a fixed potential, and outputs the converted single signal to the coaxial cable;
    And a second converter that converts the single signal output from the coaxial cable into a differential signal.
  2. 　前記第１変換部又は第２変換部が収容される筐体を有し、前記同軸ケーブルに接続されるコネクタを更に備えること
    　を特徴とする請求項１に記載のケーブル装置。     The cable device according to claim 1, further comprising a connector that includes a housing that accommodates the first conversion unit or the second conversion unit, and is connected to the coaxial cable.
  3. 　前記筐体は導体によって構成されており、
    　前記同軸ケーブルは、
    　前記第１変換部によって前記単一信号が出力される内部導体と、
    　該内部導体を覆う外部導体と
    　を有し、
    　前記筐体は前記外部導体に接触していること
    　を特徴とする請求項２に記載のケーブル装置。     The housing is made of a conductor,
    The coaxial cable is
    An inner conductor from which the single signal is output by the first converter;
    An outer conductor covering the inner conductor,
    The cable device according to claim 2, wherein the casing is in contact with the outer conductor.
  4. 　請求項１から請求項３のいずれか１つに記載のケーブル装置と、
    　該ケーブル装置を介して差動信号を相互に送受信する複数の通信装置と
    　を備えることを特徴とする通信システム。     The cable device according to any one of claims 1 to 3,
    A communication system comprising: a plurality of communication devices that transmit and receive differential signals to and from each other via the cable device.
PCT/JP2016/066893 2015-06-25 2016-06-07 Cable device and communication system WO2016208380A1 (en)

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WO2022123835A1 (en) * 2020-12-11 2022-06-16 日立Astemo株式会社 Electronic control device

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