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WO2011093190A1 - Receiving unit for digital communication device, digital communication device, and digital communication system - Google Patents

Receiving unit for digital communication device, digital communication device, and digital communication system Download PDF

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Publication number
WO2011093190A1
WO2011093190A1 PCT/JP2011/050878 JP2011050878W WO2011093190A1 WO 2011093190 A1 WO2011093190 A1 WO 2011093190A1 JP 2011050878 W JP2011050878 W JP 2011050878W WO 2011093190 A1 WO2011093190 A1 WO 2011093190A1
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Prior art keywords
digital communication
communication device
receiving unit
diode group
input
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PCT/JP2011/050878
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French (fr)
Japanese (ja)
Inventor
富浩 麦谷
孝 小林
竜彦 中島
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株式会社ステップテクニカ
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Priority to JP2011551819A priority Critical patent/JP5752054B2/en
Publication of WO2011093190A1 publication Critical patent/WO2011093190A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/40006—Architecture of a communication node
    • H04L12/40032—Details regarding a bus interface enhancer
    • 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
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0292—Arrangements specific to the receiver end

Definitions

  • the present invention relates to a receiving unit for a digital communication device, a digital communication device, and a digital communication system, and in particular, a receiving unit for a digital communication device provided for at least one of a plurality of communication terminals connected to a network,
  • the present invention relates to a digital communication apparatus and a digital communication system.
  • RS-485 As one of serial communication standards standardized by the American Electronic Industries Association. This standard is compatible with bus-type multipoint connection, and can be adopted in a digital communication system with a plurality of connections of up to 32 units.
  • a digital communication apparatus constituting this type of digital communication system is provided with a communication interface called an RS-485 transceiver including an active element.
  • the RS-485 transceiver is a relatively expensive device because it contains active elements. For this reason, there is a problem that the cost of the digital communication apparatus is increased, and the cost of the entire digital communication system is also increased.
  • the RS-485 transceiver since the RS-485 transceiver includes an active element, the power consumption is relatively large. For this reason, there is a problem from the viewpoint of running cost of the digital communication system.
  • the present invention provides a receiving unit for a digital communication device, a digital communication device, and a digital communication system, which are devised so that the communication interface is composed of only passive elements, and can be driven at low cost and with low power consumption.
  • the task is to do.
  • a receiving unit for a digital communication device, a digital communication device, and a digital communication system of the present invention include: An input connected to the network; A first diode group connected in series in the forward direction to the input terminal; A second diode group connected in series in the opposite direction with respect to the input end; A coupling line between a point between the diodes constituting the first diode group and a point between the diodes constituting the second diode group; An output terminal connected to the coupling line and connected to an input buffer provided outside the receiving unit main body for the digital communication device.
  • FIG. 1 is a configuration diagram of a schematic digital communication system according to Embodiment 1 of the present invention.
  • FIG. 2 is a graph showing voltage values at points A to D in FIG.
  • FIG. 2 is a circuit configuration diagram of a receiving unit 300 for a digital communication device provided in a central communication device 22 and terminal devices 24 to 27 in FIG. It is a graph which shows the voltage value in the point a and b of FIG. It is a circuit block diagram of the receiving unit 300 for digital communication apparatuses which concerns on Embodiment 2 of this invention.
  • FIG. 1 is a configuration diagram of a schematic digital communication system according to Embodiment 1 of the present invention.
  • FIG. 1 shows a so-called multidrop digital communication system.
  • This communication system includes a wired I / O control communication network (hereinafter simply referred to as “network”) 10 typified by a programmable relay controller (PLC) network, and a center connected to the network 10.
  • PLC programmable relay controller
  • the network 10 includes at least two physical lines such as a signal transmission line and a ground line.
  • FIG. 1 illustrates four terminal devices 24 to 27, but the number of terminal devices may be more or less than this.
  • FIG. 2 is a graph showing voltage values at points A to D in FIG.
  • the case where the voltage value of the signal output from the central communication device 22 to the network 10 is high is indicated by a high level voltage value
  • the case where the voltage value of the signal is low is indicated by a low level voltage value.
  • the voltage value at the high level gradually decreases from the point A to the point D.
  • the voltage value at the high level at point A is 7.0 V, for example, The voltage value at the high level at point B is, for example, 6.2 V, The voltage value at the high level at point C is, for example, 5.5V, The voltage value at the high level at the point D is, for example, 5.0 V, and decreases in an inverse proportion.
  • FIG. 3 is a circuit configuration diagram of the digital communication device receiving unit 300 provided in the central communication device 22 and the terminal devices 24 to 27 in FIG. As shown in FIG. 3, the digital communication device receiving unit 300 is provided with an input terminal 310 to which a signal transmission line of the network 10 is connected.
  • a capacitive element 320 that functions as a high-pass filter is connected to the input terminal 310 in series.
  • the condition of the capacitor 320 may be determined as appropriate according to the frequency of the input voltage.
  • the capacitive element 320 may be connected in series to an input end (not shown) on the ground line side of the network 10, or may be connected to both the input end 310 on the signal transmission line side and the input end on the ground line side. Each element may be connected in series.
  • a first diode group 330 is connected in series to the capacitive element 320 in the forward direction, and a second diode group 340 is connected in series in the reverse direction.
  • the first diode group 330 divides the voltage input by the input terminal 310 to mainly set the voltage value at point b in FIG. 3 to a high level.
  • the charge stored in the capacity is caused to flow as a current toward the input terminal 310 side, so that The voltage at point b in 3 is returned to a low level.
  • the first diode group 330 for example, five diodes are shown.
  • the second diode group 340 includes two diodes.
  • the numbers of diodes in the first diode group 330 and the second diode group 340 are examples, and are not limited thereto.
  • the diodes 331 to 335, 341, and 342 may or may not have the same performance. However, as will be described later, the conditions of the diodes 331 to 335, 341, and 342 are that the voltage input by the input terminal 310 can be divided by the diodes 331 to 335, and the diode 332 to the diode 335 are divided. It is essential to allow a current to flow toward the diode and to allow a current to flow from the diode 341 toward the diode 342.
  • each of the diodes 331 to 335 may cause a voltage drop of 1 V, for example. Then, the voltage value at the point b in FIG. 3 is fixed to 4V because it is divided by the diodes 331 to 335 to 1: 4 when the voltage value at the point a is 5V or more.
  • the diodes 331 and 332 constituting the first diode group 330 and the diodes 341 and 342 constituting the second diode group 340 are connected by a coupling line 350.
  • the first diode group 330 and the second diode group 340 are both grounded through the diodes 335 and 341.
  • the coupling line 350 is connected between the diodes 331 and 332, but the coupling line 350 may be connected between the diodes 332 and 333, for example.
  • the voltage is divided by 2: 3 by the diodes 331 to 335 when the voltage value at the point a in the above example is 5 V or more. Therefore, it is fixed at 3V.
  • an output end 370 is connected to the coupling line 350.
  • the output terminal 370 is connected to an input buffer 360 provided outside the digital communication device receiving unit 300, such as a buffer with a Schmitt trigger provided inside the terminal device 24 or the like.
  • the digital communication device receiving unit 300 receives the voltage of the signal supplied from the network 10 at the input terminal 310.
  • the input voltage value is at a high level, a current flows through the first diode group 330 because the downstream side of the diode 335 is grounded.
  • FIG. 4 is a graph showing voltage values at points a and b in FIG.
  • an example of the receiving unit 300 for a digital communication device built in the terminal device 24 is shown, and the case where the input voltage at point a becomes 5 V or more due to deformation due to external induction or reflected waves is shown. .
  • each of the diodes 331 to 335 causes a voltage drop of 1V.
  • the voltage value at the point a When the value of the input voltage received at the input terminal 310 is at a high level, that is, when the voltage value at the point a is 5V or more, the voltage value at the point b becomes 4V due to the voltage drop of the first diode group 330. For this reason, a voltage value lower than 4 V may be used as the high level side threshold (H) of the input buffer 360.
  • this voltage value is 3.5V.
  • the low level threshold (L) of the input buffer 360 may be determined, and this voltage value is generally set to 0.8V.
  • the diodes 331 to 335 and 341 to 342 function as clippers. For this reason, since the high voltage value is clipped, the destruction of the input buffer 360 can be prevented.
  • the diodes 331 to 335 and 341 to 342 are not necessarily used as long as the input voltage input by the input terminal 310 is divided. A person skilled in the art would generally replace all of them as resistance elements.
  • the input voltage input by the input terminal 310 is a high voltage of 10 V
  • the input buffer There is a problem that a destructive voltage such as 8V is applied to 360.
  • the amount of voltage drop at each resistance element increases as the number of terminal devices connected to the network 10 increases. become. Therefore, the input value of the input buffer 360 of the terminal device physically located far from the central communication device 22 falls below the threshold value, and communication is impossible.
  • each of the diodes 331 to 335 and 341 to 342 is used to configure the digital communication device receiving unit 300. It is composed.
  • the digital communication device receiving unit 300 shown in FIG. 3 does not mention that a resistance element should not be used.
  • adding a resistance element under a certain condition to the first and second diodes 330 and 340 has various advantages.
  • the digital communication device receiving unit 300 is unique in this embodiment in that all of the elements are composed of passive elements. Therefore, unlike the conventional case, the digital communication device receiving unit 300 does not become expensive, and its power consumption is small.
  • FIG. 5 is a circuit configuration diagram of the receiving unit 300 for a digital communication apparatus according to the second embodiment of the present invention, and corresponds to FIG. In the present embodiment, a digital communication system that is suitable when the number of terminal devices increases or when the wiring length of the network 10 increases will be described.
  • a resistor 336 is added to the first diode group 330 shown in FIG. 3, and a resistor 346 is added to the second diode group 340.
  • the number of diodes in the first diode group 330 and the second diode group 340 is two, although illustrated.
  • the resistors 336 and 346 may be appropriately selected from resistance values of several k ⁇ to several M ⁇ . Specifically, the resistance values of the resistors 336 and 346 are based on the noise intensity in the usage environment of the digital communication system and the minimum current value necessary for the digital communication device receiving unit 300 to operate the digital communication system. To select.
  • each diode 332 and the like may be selected so as to sufficiently correspond to the frequency of the signal received at the input terminal 310.
  • a Schottky barrier diode can be selected, but is not limited thereto.
  • FIG. 5 shows a state in which the resistors 336 and 346 are connected downstream of the diodes 332 and 342, respectively, but the resistors 336 and 346 may be connected upstream of the diodes 332 and 342. . Further, instead of adding both the resistors 336 and 346 to the first and second diode groups 330 and 340, only one of them may be added.
  • the digital communication device receiving unit 300 receives the voltage of the signal supplied from the network 10 at the input terminal 310, when the input voltage value is at a high level, the current based on the voltage is digital as described above. The current flows to the first diode group 330 of the communication device receiving unit 300.
  • the current flowing through the first diode group 330 depends on the resistance value of the resistor 336, it is difficult to flow when viewed relatively. This is because the addition of the resistor 336 makes it difficult for current to flow through the first diode group 330.
  • the high level voltage value obtained at point b can be set to be the same as or higher than that in FIG. 3 by appropriately selecting the resistance value of the resistor 336. Can be a value.
  • the energy absorbed by the digital communication device receiving unit 300 from the signal waveform propagating through the network 10 is compared with that in FIG. It can be said that it can be made relatively small.
  • the energy reaching the point b is extremely small. Therefore, the destruction due to the destructive noise is avoided by a protection circuit that is provided as standard in the buffer 360.
  • the merit when only the resistor 346 is added to the digital communication device receiving unit 300 is the same as that when the resistor 336 is provided. That is, when the digital communication device receiving unit 300 receives the voltage of the signal supplied from the network 10 at the input terminal 310, the current flowing through the second diode group 340 decreases when the input voltage value is low. Therefore, the influence on the signal waveform propagating through the network 10 can be reduced.
  • the present invention relates to medical equipment such as digital X-ray imaging apparatus and ultrasonic imaging apparatus, coin bill automatic payment machines such as cash register change machines and ATM apparatuses, OA equipment such as printers and scanners, vending machines such as tickets and drinking water. It can use suitably for the communication system of this.

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

Abstract

Disclosed is a receiving unit for a digital communication device that is driven inexpensively and with low power consumption by modifying a communications interface to be configured only with passive elements. The receiving unit comprises an input terminal (310) that is connected to a network (10); a first diode group (330) that is serially connected in the forward direction upon the input terminal (310); a second diode group (340) that is serially connected in the reverse direction upon the input terminal (310); an input buffer (360) that is disposed upon a connecting wire that connects a point between diodes (331, 332) that configure the first diode group (330) and a point that connects diodes (341, 342) that configure the second diode group (340); and an output terminal (370) that is connected to the input buffer (360).

Description

ディジタル通信装置用受信ユニット、ディジタル通信装置及びディジタル通信システムReceiving unit for digital communication device, digital communication device and digital communication system
　本発明は、ディジタル通信装置用受信ユニット、ディジタル通信装置及びディジタル通信システムに関し、特に、ネットワークに接続される複数の通信端末のうち少なくとも１台以上に対して設けられる、ディジタル通信装置用受信ユニット、ディジタル通信装置及びディジタル通信システムに関する。 The present invention relates to a receiving unit for a digital communication device, a digital communication device, and a digital communication system, and in particular, a receiving unit for a digital communication device provided for at least one of a plurality of communication terminals connected to a network, The present invention relates to a digital communication apparatus and a digital communication system.
　従来、米国電子工業会によって標準化されたシリアル通信の規格の一つに、ＲＳ－４８５という規格が存在する。この規格は、バス型のマルチポイント接続に対応し、最大で３２台までの複数対複数接続のディジタル通信システムに採用可能なものである。この種のディジタル通信システムを構成するディジタル通信装置は、能動素子を含むＲＳ－４８５トランシーバと称される通信インターフェイスが設けられている。 Conventionally, there is a standard called RS-485 as one of serial communication standards standardized by the American Electronic Industries Association. This standard is compatible with bus-type multipoint connection, and can be adopted in a digital communication system with a plurality of connections of up to 32 units. A digital communication apparatus constituting this type of digital communication system is provided with a communication interface called an RS-485 transceiver including an active element.
　しかし、ＲＳ－４８５トランシーバは、能動素子を含んでいることから、相対的に高価な装置である。このため、ディジタル通信装置がコストアップし、ひいては、ディジタル通信システム全体もコストアップしてしまうという問題がある。 However, the RS-485 transceiver is a relatively expensive device because it contains active elements. For this reason, there is a problem that the cost of the digital communication apparatus is increased, and the cost of the entire digital communication system is also increased.
　また、ＲＳ－４８５トランシーバは、能動素子を含んでいることから、相対的に消費電力が大きい。このため、ディジタル通信システムのランニングコストの面からも問題がある。 Also, since the RS-485 transceiver includes an active element, the power consumption is relatively large. For this reason, there is a problem from the viewpoint of running cost of the digital communication system.
　そこで、本発明は、通信インターフェイスを受動素子のみで構成するように工夫して、安価に、かつ、低消費電力で駆動させられる、ディジタル通信装置用受信ユニット、ディジタル通信装置及びディジタル通信システムを提供することを課題とする。 Therefore, the present invention provides a receiving unit for a digital communication device, a digital communication device, and a digital communication system, which are devised so that the communication interface is composed of only passive elements, and can be driven at low cost and with low power consumption. The task is to do.
　上記課題を解決するために、本発明のディジタル通信装置用受信ユニット、ディジタル通信装置及びディジタル通信システムは、
　ネットワークに接続されている入力端と、
　前記入力端に対して順方向に直列接続されている第１のダイオード群と、
　前記入力端に対して逆方向に直列接続されている第２のダイオード群と、
　前記第１のダイオード群を構成するダイオード間の点と前記第２のダイオード群を構成するダイオード間の点との結合線と、
　前記結合線に接続されるとともにディジタル通信装置用受信ユニット本体の外部に設けられる入力バッファに接続される出力端と、を備える。 In order to solve the above problems, a receiving unit for a digital communication device, a digital communication device, and a digital communication system of the present invention include:
An input connected to the network;
A first diode group connected in series in the forward direction to the input terminal;
A second diode group connected in series in the opposite direction with respect to the input end;
A coupling line between a point between the diodes constituting the first diode group and a point between the diodes constituting the second diode group;
An output terminal connected to the coupling line and connected to an input buffer provided outside the receiving unit main body for the digital communication device.
本発明の実施形態１に係る模式的なディジタル通信システムの構成図である。1 is a configuration diagram of a schematic digital communication system according to Embodiment 1 of the present invention. FIG. 図１のＡ点～Ｄ点における電圧値を示すグラフである。2 is a graph showing voltage values at points A to D in FIG. 図１の中央通信装置２２及び端末装置２４～２７に設けられているディジタル通信装置用受信ユニット３００の回路構成図である。FIG. 2 is a circuit configuration diagram of a receiving unit 300 for a digital communication device provided in a central communication device 22 and terminal devices 24 to 27 in FIG. 図３のａ点及びｂ点での電圧値を示すグラフである。It is a graph which shows the voltage value in the point a and b of FIG. 本発明の実施形態２に係るディジタル通信装置用受信ユニット３００回路構成図である。It is a circuit block diagram of the receiving unit 300 for digital communication apparatuses which concerns on Embodiment 2 of this invention.
　１０　通信ネットワーク
　２２　中央通信装置
　２４～２７　端末装置
　３００　受信ユニット
　３１０　入力端
　３２０　容量素子
　３３０　第１のダイオード群
　３４０　第２のダイオード群
　３６０　入力バッファ
　３７０　出力端 DESCRIPTION OF SYMBOLS 10 Communication network 22 Central communication apparatus 24-27 Terminal apparatus 300 Reception unit 310 Input terminal 320 Capacitance element 330 1st diode group 340 2nd diode group 360 Input buffer 370 Output terminal
発明の実施の形態BEST MODE FOR CARRYING OUT THE INVENTION
　以下、本発明の実施形態について図面を参照して説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
　（実施形態１）
　図１は、本発明の実施形態１に係る模式的なディジタル通信システムの構成図である。図１には、いわゆるマルチドロップ式のディジタル通信システムを示している。この通信システムは、プログラマブルリレーコントローラ（ＰＬＣ）用ネットワークに代表される有線のＩ／Ｏ制御用通信ネットワーク（以下、単に「ネットワーク」と称する。）１０と、ネットワーク１０に対して接続されている中央通信装置２２と、中央通信装置２２に対してマルチポイント接続されていて固有のアドレスが設定される端末装置２４～２７とを備える。 (Embodiment 1)
FIG. 1 is a configuration diagram of a schematic digital communication system according to Embodiment 1 of the present invention. FIG. 1 shows a so-called multidrop digital communication system. This communication system includes a wired I / O control communication network (hereinafter simply referred to as “network”) 10 typified by a programmable relay controller (PLC) network, and a center connected to the network 10. A communication device 22 and terminal devices 24 to 27 that are multipoint connected to the central communication device 22 and have unique addresses set therein.
　なお、ネットワーク１０は、信号伝送ラインとグランドラインなどの、少なくとも物理的に２本のラインを含むものである。また、図１には、４台の端末装置２４～２７を例示しているが、端末装置の台数は、これよりも多くても少なくてもよい。 Note that the network 10 includes at least two physical lines such as a signal transmission line and a ground line. FIG. 1 illustrates four terminal devices 24 to 27, but the number of terminal devices may be more or less than this.
　図２は、図１のＡ点～Ｄ点における電圧値を示すグラフである。ここでは、中央通信装置２２からネットワーク１０に対して出力される信号の電圧値が高い場合をハイレベルの電圧値で示し、当該信号の電圧値が低い場合をローレベルの電圧値で示している。 FIG. 2 is a graph showing voltage values at points A to D in FIG. Here, the case where the voltage value of the signal output from the central communication device 22 to the network 10 is high is indicated by a high level voltage value, and the case where the voltage value of the signal is low is indicated by a low level voltage value. .
　ネットワーク１０の電圧降下、及び、端末装置２４～２７の電圧降下により、Ａ点からＤ点に向けて徐々に、ハイレベル時の電圧値は低下していく。 Due to the voltage drop of the network 10 and the voltage drops of the terminal devices 24 to 27, the voltage value at the high level gradually decreases from the point A to the point D.
　一例を示すと、Ａ点におけるハイレベル時の電圧値が例えば７．０Ｖであるとすると、
　Ｂ点におけるハイレベル時の電圧値は例えば６．２Ｖとなり、
　Ｃ点におけるハイレベル時の電圧値は例えば５．５Ｖとなり、
　Ｄ点におけるハイレベル時の電圧値は例えば５．０Ｖとなる、というように、反比例的に低下していくことになる。 As an example, if the voltage value at the high level at point A is 7.0 V, for example,
The voltage value at the high level at point B is, for example, 6.2 V,
The voltage value at the high level at point C is, for example, 5.5V,
The voltage value at the high level at the point D is, for example, 5.0 V, and decreases in an inverse proportion.
　図３は、図１の中央通信装置２２及び端末装置２４～２７に設けられているディジタル通信装置用受信ユニット３００の回路構成図である。図３に示すように、ディジタル通信装置用受信ユニット３００には、ネットワーク１０の信号伝送ラインが接続される入力端３１０が設けられている。 FIG. 3 is a circuit configuration diagram of the digital communication device receiving unit 300 provided in the central communication device 22 and the terminal devices 24 to 27 in FIG. As shown in FIG. 3, the digital communication device receiving unit 300 is provided with an input terminal 310 to which a signal transmission line of the network 10 is connected.
　入力端３１０には、例えば、ハイパスフィルターとして機能する容量素子３２０が直列接続されている。容量素子３２０の条件は、入力電圧の周波数に応じて適宜決定すればよい。なお、容量素子３２０は、ネットワーク１０のグランドライン側の入力端（図示せず）に直列接続してもよいし、信号伝送ライン側の入力端３１０とグランドライン側の入力端との双方に容量素子をそれぞれ直列接続してもよい。 For example, a capacitive element 320 that functions as a high-pass filter is connected to the input terminal 310 in series. The condition of the capacitor 320 may be determined as appropriate according to the frequency of the input voltage. The capacitive element 320 may be connected in series to an input end (not shown) on the ground line side of the network 10, or may be connected to both the input end 310 on the signal transmission line side and the input end on the ground line side. Each element may be connected in series.
　容量素子３２０には、第１のダイオード群３３０が順方向に直列接続されて、かつ、第２のダイオード群３４０が逆方向に直列接続されている。第１のダイオード群３３０は、入力端３１０によって入力された電圧を分圧することによって、主として、図３内のｂ点の電圧値をハイレベルとするものである。 A first diode group 330 is connected in series to the capacitive element 320 in the forward direction, and a second diode group 340 is connected in series in the reverse direction. The first diode group 330 divides the voltage input by the input terminal 310 to mainly set the voltage value at point b in FIG. 3 to a high level.
　一方、第２のダイオード群３４０は、第１のダイオード群３３０が少なからず容量を有しているので、その容量に蓄電された電荷を、入力端３１０側に向けて電流として流すことによって、図３内のｂ点の電圧をローレベルに戻すものである。 On the other hand, in the second diode group 340, since the first diode group 330 has a considerable capacity, the charge stored in the capacity is caused to flow as a current toward the input terminal 310 side, so that The voltage at point b in 3 is returned to a low level.
　本実施形態では、第１のダイオード群３３０としては、例えば５つのダイオードを備えている様子を示している。第２のダイオード群３４０としては、例えば２つのダイオードを備えている様子を示している。もっとも、第１のダイオード群３３０及び第２のダイオード群３４０の各ダイオード数は例示であり、これらに限定されるものではない。 In the present embodiment, as the first diode group 330, for example, five diodes are shown. For example, the second diode group 340 includes two diodes. However, the numbers of diodes in the first diode group 330 and the second diode group 340 are examples, and are not limited thereto.
　各ダイオード３３１～３３５，３４１，３４２は、同一性能のものとしてもよいし、そうでなくてもよい。ただし、後述するように、各ダイオード３３１～３３５，３４１，３４２の条件は、入力端３１０によって入力された電圧を各ダイオード３３１～３３５によって分圧できるようにすることと、ダイオード３３２からダイオード３３５に向けて電流が流れるようにすることと、ダイオード３４１からダイオード３４２に向けて電流が流れるようにすることとが必須である。 The diodes 331 to 335, 341, and 342 may or may not have the same performance. However, as will be described later, the conditions of the diodes 331 to 335, 341, and 342 are that the voltage input by the input terminal 310 can be divided by the diodes 331 to 335, and the diode 332 to the diode 335 are divided. It is essential to allow a current to flow toward the diode and to allow a current to flow from the diode 341 toward the diode 342.
　具体的には、例えば、上記分圧の条件としては、各ダイオード３３１～３３５は、それぞれ、例えば１Ｖの電圧降下を生じさせるものとすればよい。そうすると、図３内のｂ点での電圧値は、ａ点の電圧値が５Ｖ以上の場合には、ダイオード３３１～３３５によって１：４に分圧されるので４Ｖに固定される。 Specifically, for example, as the above-mentioned voltage dividing condition, each of the diodes 331 to 335 may cause a voltage drop of 1 V, for example. Then, the voltage value at the point b in FIG. 3 is fixed to 4V because it is divided by the diodes 331 to 335 to 1: 4 when the voltage value at the point a is 5V or more.
　第１のダイオード群３３０を構成するダイオード３３１，３３２間と、第２のダイオード群３４０を構成するダイオード３４１，３４２間とは、結合線３５０によって結ばれている。また、第１のダイオード群３３０と第２のダイオード群３４０とは、ともに、ダイオード３３５，３４１を通じて、グランドに接地されている。 The diodes 331 and 332 constituting the first diode group 330 and the diodes 341 and 342 constituting the second diode group 340 are connected by a coupling line 350. The first diode group 330 and the second diode group 340 are both grounded through the diodes 335 and 341.
　なお、図３の場合には、結合線３５０をダイオード３３１，３３２間に接続しているが、例えば結合線３５０をダイオード３３２，３３３間に接続してもよい。この場合、仮に、ダイオード３３１～３３５を同一条件のものから構成しているのであれば、上記例のａ点の電圧値が５Ｖ以上の場合には、ダイオード３３１～３３５によって２：３に分圧されるので３Ｖに固定される。 In the case of FIG. 3, the coupling line 350 is connected between the diodes 331 and 332, but the coupling line 350 may be connected between the diodes 332 and 333, for example. In this case, if the diodes 331 to 335 are composed of the same conditions, the voltage is divided by 2: 3 by the diodes 331 to 335 when the voltage value at the point a in the above example is 5 V or more. Therefore, it is fixed at 3V.
　また、結合線３５０には、出力端３７０が接続されている。出力端３７０には、端末装置２４等の内部に設けられているシュミットトリガ付きバッファなど、ディジタル通信装置用受信ユニット３００の外部に設けられている入力バッファ３６０が接続されている。 Also, an output end 370 is connected to the coupling line 350. The output terminal 370 is connected to an input buffer 360 provided outside the digital communication device receiving unit 300, such as a buffer with a Schmitt trigger provided inside the terminal device 24 or the like.
　つぎに、ディジタル通信装置用受信ユニット３００の動作について説明する。ディジタル通信装置用受信ユニット３００は、ネットワーク１０から供給される信号の電圧を入力端３１０で受ける。この入力電圧値がハイレベルのときには、ダイオード３３５の下流が接地されているため、第１のダイオード群３３０に電流が流れる。 Next, the operation of the digital communication device receiving unit 300 will be described. The digital communication device receiving unit 300 receives the voltage of the signal supplied from the network 10 at the input terminal 310. When the input voltage value is at a high level, a current flows through the first diode group 330 because the downstream side of the diode 335 is grounded.
　その後、入力端３１０で受けた入力電圧の値がローレベルになったときには、第１のダイオード群３３０の容量に蓄電された電荷は、入力端３１０が相対的に低電圧となるので、電流となって第２のダイオード群３４０に流れる。 After that, when the value of the input voltage received at the input terminal 310 becomes a low level, the charge stored in the capacitor of the first diode group 330 becomes relatively low voltage at the input terminal 310, so that And flows to the second diode group 340.
　図４は、図３のａ点及びｂ点での電圧値を示すグラフである。ここでは、端末装置２４に内蔵されているディジタル通信装置用受信ユニット３００の例を示しており、ａ点の入力電圧が外来誘導や反射波などによる変形により５Ｖ以上となった場合を示している。また、図４の説明では、各ダイオード３３１～３３５が１Ｖの電圧降下を生じさせるものとする。 FIG. 4 is a graph showing voltage values at points a and b in FIG. Here, an example of the receiving unit 300 for a digital communication device built in the terminal device 24 is shown, and the case where the input voltage at point a becomes 5 V or more due to deformation due to external induction or reflected waves is shown. . In the description of FIG. 4, it is assumed that each of the diodes 331 to 335 causes a voltage drop of 1V.
　入力端３１０で受ける入力電圧の値がハイレベルのとき、すなわち、ａ点の電圧値が５Ｖ以上のときには、ｂ点の電圧値は、第１のダイオード群３３０の電圧降下によって４Ｖとなる。このため、４Ｖよりも低電圧である電圧値を、入力バッファ３６０のハイレベル側スレッシュホールド（Ｈ）とすればよい。 When the value of the input voltage received at the input terminal 310 is at a high level, that is, when the voltage value at the point a is 5V or more, the voltage value at the point b becomes 4V due to the voltage drop of the first diode group 330. For this reason, a voltage value lower than 4 V may be used as the high level side threshold (H) of the input buffer 360.
　一般的には、この電圧値は３．５Ｖとされている。同様に、入力バッファ３６０のローレベル側スレッシュホールド（Ｌ）を決定すればよく、一般的には、この電圧値は０．８Ｖとされている。 Generally, this voltage value is 3.5V. Similarly, the low level threshold (L) of the input buffer 360 may be determined, and this voltage value is generally set to 0.8V.
　入力端３１０に対して、例えば１０Ｖといった高電圧の信号が入力された場合であっても、各ダイオード３３１～３３５，３４１～３４２がクリッパとして機能することになる。このため、高電圧値がクリップされるので、入力バッファ３６０の破壊は防止できる。 Even when a high voltage signal such as 10 V is input to the input terminal 310, the diodes 331 to 335 and 341 to 342 function as clippers. For this reason, since the high voltage value is clipped, the destruction of the input buffer 360 can be prevented.
　なお、比較例的に述べると、入力端３１０によって入力された入力電圧を分圧するのであれば、必ずしも各ダイオード３３１～３３５，３４１～３４２を用いる必要はない。当業者であれば、これらに代えて、それらのすべてを抵抗素子とすることが一般的であろう。 As a comparative example, the diodes 331 to 335 and 341 to 342 are not necessarily used as long as the input voltage input by the input terminal 310 is divided. A person skilled in the art would generally replace all of them as resistance elements.
　しかし、上記のように、入力端３１０によって入力された入力電圧が１０Ｖという高電圧の場合には、各ダイオード３３１～３３５，３４１～３４２に代えて、それらのすべてを抵抗素子とすると、入力バッファ３６０に８Ｖといった破壊的な電圧が印加されることになるという問題がある。 However, as described above, when the input voltage input by the input terminal 310 is a high voltage of 10 V, if all of them are used as resistance elements instead of the diodes 331 to 335 and 341 to 342, the input buffer There is a problem that a destructive voltage such as 8V is applied to 360.
　また、各ダイオード３３１～３３５，３４１～３４２に代えて、それらのすべてを抵抗素子とすると、ネットワーク１０に接続される端末装置の台数が増加するにつれて、各抵抗素子での電圧降下量が嵩むことになる。したがって、中央通信装置２２から物理的に遠方に位置する端末装置の入力バッファ３６０の入力値は、その閾値を下回り、通信不能となる。 Further, if all of the diodes 331 to 335 and 341 to 342 are used as resistance elements, the amount of voltage drop at each resistance element increases as the number of terminal devices connected to the network 10 increases. become. Therefore, the input value of the input buffer 360 of the terminal device physically located far from the central communication device 22 falls below the threshold value, and communication is impossible.
　換言すれば、入力端３１０によって入力された入力電圧を分圧するために、各ダイオード３３１～３３５，３４１～３４２に代えて、それらのすべてを抵抗素子とすると、ディジタル通信システム全体として通信不能とならないようにするためには、ネットワーク１０に接続される端末装置の台数が制約されるという問題もある。 In other words, in order to divide the input voltage input by the input terminal 310, instead of the diodes 331 to 335 and 341 to 342, all of them are resistance elements, so that the communication as a whole of the digital communication system is not disabled. In order to do so, there is a problem that the number of terminal devices connected to the network 10 is limited.
　そこで、本実施形態では、入力端３１０によって入力された入力電圧を分圧するために抵抗素子を用いるのではなく、各ダイオード３３１～３３５，３４１～３４２を用いて、ディジタル通信装置用受信ユニット３００を構成している。 Therefore, in the present embodiment, instead of using a resistive element to divide the input voltage input by the input terminal 310, each of the diodes 331 to 335 and 341 to 342 is used to configure the digital communication device receiving unit 300. It is composed.
　もっとも、図３に示すディジタル通信装置用受信ユニット３００において、抵抗素子を用いるべきでないということを言及してはいない点に留意されたい。実施形態２で後述するように、第１及び第２のダイオード３３０，３４０に対して、一定条件下で抵抗素子を付加すると種々のメリットがある。 However, it should be noted that the digital communication device receiving unit 300 shown in FIG. 3 does not mention that a resistance element should not be used. As will be described later in the second embodiment, adding a resistance element under a certain condition to the first and second diodes 330 and 340 has various advantages.
　また、図３の回路構成図から明らかなように、ディジタル通信装置用受信ユニット３００は、そのすべての素子が受動素子で構成されている点は、本実施形態のユニークな点である。このため、従来のように、ディジタル通信装置用受信ユニット３００は高価とならないし、また、その消費電力は小さくて済む。 As is clear from the circuit configuration diagram of FIG. 3, the digital communication device receiving unit 300 is unique in this embodiment in that all of the elements are composed of passive elements. Therefore, unlike the conventional case, the digital communication device receiving unit 300 does not become expensive, and its power consumption is small.
　（実施形態２）
　図５は、本発明の実施形態２に係るディジタル通信装置用受信ユニット３００回路構成図であり、図３に対応するものである。本実施形態では、端末装置の台数が増加した場合、或いは、ネットワーク１０の配線長が増加した場合に好適なディジタル通信システムについて説明する。 (Embodiment 2)
FIG. 5 is a circuit configuration diagram of the receiving unit 300 for a digital communication apparatus according to the second embodiment of the present invention, and corresponds to FIG. In the present embodiment, a digital communication system that is suitable when the number of terminal devices increases or when the wiring length of the network 10 increases will be described.
　図５には、図３に示した第１のダイオード群３３０に対して抵抗３３６を付加し、かつ、第２のダイオード群３４０に対して抵抗３４６を付加している。また、第１のダイオード群３３０，第２のダイオード群３４０におけるダイオードの数は、例示ではあるが、それぞれ２つとしている。 In FIG. 5, a resistor 336 is added to the first diode group 330 shown in FIG. 3, and a resistor 346 is added to the second diode group 340. In addition, the number of diodes in the first diode group 330 and the second diode group 340 is two, although illustrated.
　抵抗３３６，３４６は、それぞれ、数ｋΩ～数ＭΩの抵抗値のものを適宜選択すればよい。具体的には、抵抗３３６，３４６の抵抗値は、ディジタル通信システムの使用環境におけるノイズの強さと、ディジタル通信システムを動作させるためにディジタル通信装置用受信ユニット３００に必要な最低電流値とに基づいて選択すればよい。 The resistors 336 and 346 may be appropriately selected from resistance values of several kΩ to several MΩ. Specifically, the resistance values of the resistors 336 and 346 are based on the noise intensity in the usage environment of the digital communication system and the minimum current value necessary for the digital communication device receiving unit 300 to operate the digital communication system. To select.
　また、各ダイオード３３２等は、入力端３１０で受ける信号の周波数に十分対応できるものを選択すればよい。この種のダイオードとしては、例えば、ショットキーバリアダイオードを選択することができるが、これに限定されるものではない。 In addition, each diode 332 and the like may be selected so as to sufficiently correspond to the frequency of the signal received at the input terminal 310. As this kind of diode, for example, a Schottky barrier diode can be selected, but is not limited thereto.
　なお、図５では、抵抗３３６，３４６を、各々、ダイオード３３２，３４２の下流に接続している状態を示しているが、抵抗３３６，３４６は、ダイオード３３２，３４２の上流に接続してもよい。また、第１及び第２のダイオード群３３０，３４０に対して、抵抗３３６，３４６の双方を付加するのではなく、これらのうち、いずれか一方のみを付加してもよい。 5 shows a state in which the resistors 336 and 346 are connected downstream of the diodes 332 and 342, respectively, but the resistors 336 and 346 may be connected upstream of the diodes 332 and 342. . Further, instead of adding both the resistors 336 and 346 to the first and second diode groups 330 and 340, only one of them may be added.
　ここで、ディジタル通信装置用受信ユニット３００に対して抵抗３３６のみ付加した場合のメリットとしては、以下のものがあげられる。すなわち、ディジタル通信装置用受信ユニット３００がネットワーク１０から供給される信号の電圧を入力端３１０で受けた場合、入力電圧値がハイレベルのときには、既述のように、当該電圧に基づく電流がディジタル通信装置用受信ユニット３００の第１のダイオード群３３０に流れる。 Here, as the merit when only the resistor 336 is added to the digital communication device receiving unit 300, the following can be cited. That is, when the digital communication device receiving unit 300 receives the voltage of the signal supplied from the network 10 at the input terminal 310, when the input voltage value is at a high level, the current based on the voltage is digital as described above. The current flows to the first diode group 330 of the communication device receiving unit 300.
　しかし、第１のダイオード群３３０に流れる電流は、抵抗３３６の抵抗値にもよるが、相対的にみれば流れにくい。なぜなら、抵抗３３６を付加したことによって、第１のダイオード群３３０に電流が流れにくくなるためである。 However, although the current flowing through the first diode group 330 depends on the resistance value of the resistor 336, it is difficult to flow when viewed relatively. This is because the addition of the resistor 336 makes it difficult for current to flow through the first diode group 330.
　また、ディジタル通信装置用受信ユニット３００に対して抵抗３３６のみ付加すると、抵抗３３６の抵抗値を適宜選択することによって、ｂ点で得られるハイレベルの電圧値を、図３の場合と同様もしくは高い値とすることができる。 Further, if only the resistor 336 is added to the digital communication device receiving unit 300, the high level voltage value obtained at point b can be set to be the same as or higher than that in FIG. 3 by appropriately selecting the resistance value of the resistor 336. Can be a value.
　したがって、ディジタル通信装置用受信ユニット３００に対して抵抗３３６のみ付加した場合のメリットとしては、ディジタル通信装置用受信ユニット３００がネットワーク１０を伝播する信号波形から吸収するエネルギーを、図３のものに比して相対的に小さくできるといえる。また、この実施形態では、ａ点に破壊的ノイズが供給されたとしても、ｂ点に到達するエネルギーは極めて小さくなる。したがって、上記破壊的ノイズによる破壊は、バッファ３６０に標準的に装備されている保護回路により回避される。 Therefore, as a merit when only the resistor 336 is added to the digital communication device receiving unit 300, the energy absorbed by the digital communication device receiving unit 300 from the signal waveform propagating through the network 10 is compared with that in FIG. It can be said that it can be made relatively small. In this embodiment, even if destructive noise is supplied to the point a, the energy reaching the point b is extremely small. Therefore, the destruction due to the destructive noise is avoided by a protection circuit that is provided as standard in the buffer 360.
　一方、ディジタル通信装置用受信ユニット３００に対して抵抗３４６のみ付加した場合のメリットも、抵抗３３６を設けた場合と同様である。すなわち、ディジタル通信装置用受信ユニット３００がネットワーク１０から供給される信号の電圧を入力端３１０で受けた場合、入力電圧値がローレベルのときに、第２のダイオード群３４０に流れる電流が少なくなるので、ネットワーク１０を伝播する信号波形への影響を少なくすることなどが可能となる。 On the other hand, the merit when only the resistor 346 is added to the digital communication device receiving unit 300 is the same as that when the resistor 336 is provided. That is, when the digital communication device receiving unit 300 receives the voltage of the signal supplied from the network 10 at the input terminal 310, the current flowing through the second diode group 340 decreases when the input voltage value is low. Therefore, the influence on the signal waveform propagating through the network 10 can be reduced.
　また、ディジタル通信装置用受信ユニット３００に対して抵抗３３６，３４６の双方を付加した場合のメリットとしては、上記の各メリットに加えて、ネットワーク１０を伝播する信号波形へのエネルギー変動をハイレベル時とローレベル時共に微量とすることができるので、ネットワーク１０を伝播する信号波形を変形させるような影響を与えにくいというメリットがある。特に、抵抗３３６，３４６の抵抗値を近似させた場合には、当該影響をより抑えることが可能となる。 Further, as a merit when both resistors 336 and 346 are added to the receiving unit 300 for the digital communication apparatus, in addition to the above merits, the energy fluctuation to the signal waveform propagating through the network 10 is high level. Therefore, there is a merit that it is difficult to affect the signal waveform propagating through the network 10 at a low level. In particular, when the resistance values of the resistors 336 and 346 are approximated, the influence can be further suppressed.
産業上の利用分野Industrial application fields
　本発明は、ディジタルＸ線撮像装置及び超音波撮像装置などの医療機器、レジ釣銭機及びＡＴＭ装置などの硬貨紙幣自動支払機、プリンタ及びスキャナなどのＯＡ機器、切符及び飲料水等の自動販売機内の通信システムなどに好適に用いることができる。 The present invention relates to medical equipment such as digital X-ray imaging apparatus and ultrasonic imaging apparatus, coin bill automatic payment machines such as cash register change machines and ATM apparatuses, OA equipment such as printers and scanners, vending machines such as tickets and drinking water. It can use suitably for the communication system of this.

Claims (5)

  1. 　ネットワークに接続されている入力端と、
    　前記入力端に対して順方向に直列接続されている第１のダイオード群と、
    　前記入力端に対して逆方向に直列接続されている第２のダイオード群と、
    　前記第１のダイオード群を構成するダイオード間の点と前記第２のダイオード群を構成するダイオード間の点との結合線と、
    　前記結合線に接続されるとともにディジタル通信装置用受信ユニット本体の外部に設けられる入力バッファに接続される出力端と、を備えるディジタル通信装置用受信ユニット。     An input connected to the network;
    A first diode group connected in series in the forward direction to the input terminal;
    A second diode group connected in series in the opposite direction with respect to the input end;
    A coupling line between a point between the diodes constituting the first diode group and a point between the diodes constituting the second diode group;
    A digital communication device receiving unit comprising: an output end connected to the coupling line and connected to an input buffer provided outside the digital communication device receiving unit main body.
  2. 　前記第１及び第２のダイオード群の少なくとも一方に、抵抗が付加されている、請求項１記載のディジタル通信装置用受信ユニット。 The digital communication device receiving unit according to claim 1, wherein a resistance is added to at least one of the first and second diode groups.
  3. 　前記入力端と、前記第１及び第２のダイオード群との間に、容量素子を直列的に設けた、請求項１乃至２記載のディジタル通信装置用受信ユニット。 3. A receiving unit for a digital communication device according to claim 1, wherein a capacitive element is provided in series between the input terminal and the first and second diode groups.
  4. 　請求項１乃至３のいずれか記載のディジタル通信装置用受信ユニットと、前記外部入力バッファとを備えるとともに、
    　前記入力端が前記ネットワークに接続可能であり、かつ、
    　当該出力端が前記入力バッファに接続されるディジタル通信装置。     A digital communication device receiving unit according to any one of claims 1 to 3 and the external input buffer,
    The input end is connectable to the network; and
    A digital communication apparatus in which the output terminal is connected to the input buffer.
  5. 　請求項１乃至３のいずれか記載のディジタル通信装置用受信ユニットを備える複数のディジタル通信装置と、
    　前記各ディジタル通信装置を相互に接続するネットワークとを備える、ディジタル通信システム。     A plurality of digital communication devices comprising the receiving unit for a digital communication device according to any one of claims 1 to 3,
    A digital communication system comprising a network for connecting the digital communication devices to each other.
PCT/JP2011/050878 2010-02-01 2011-01-19 Receiving unit for digital communication device, digital communication device, and digital communication system WO2011093190A1 (en)

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JP7529628B2 (en) 2021-07-26 2024-08-06 株式会社日立製作所 Printed wiring board and information processing device

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JP3041882B2 (en) 1990-05-08 2000-05-15 ソニー株式会社 Pulse diagnosis device
JP3006122B2 (en) 1991-03-18 2000-02-07 ソニー株式会社 Blood vessel inner wall condition observation device
JP3006123B2 (en) 1991-03-18 2000-02-07 ソニー株式会社 Arterial stiffness observation device

Citations (1)

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Publication number Priority date Publication date Assignee Title
JPH09162716A (en) * 1995-12-07 1997-06-20 Hitachi Ltd Input circuit

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JP2008236461A (en) * 2007-03-22 2008-10-02 Seiko Epson Corp Data slice circuit and data restoration circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09162716A (en) * 1995-12-07 1997-06-20 Hitachi Ltd Input circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7529628B2 (en) 2021-07-26 2024-08-06 株式会社日立製作所 Printed wiring board and information processing device

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