JP4526297B2 - Transmission system - Google Patents

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JP4526297B2
JP4526297B2 JP2004128498A JP2004128498A JP4526297B2 JP 4526297 B2 JP4526297 B2 JP 4526297B2 JP 2004128498 A JP2004128498 A JP 2004128498A JP 2004128498 A JP2004128498 A JP 2004128498A JP 4526297 B2 JP4526297 B2 JP 4526297B2
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隆司 鈴木
スタッケスタッド クリスタ
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Nittan Co Ltd
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Description

本発明は、伝送システムに関する。   The present invention relates to a transmission system.

図１は従来の伝送システムの構成例を示す図である。   FIG. 1 is a diagram illustrating a configuration example of a conventional transmission system.

図１の伝送システムは、例えば防災システムのＲ型受信機１として構成されており、Ｒ型受信機１として、直流電源（例えば３７Ｖの直流電圧を発生する直流電源）２と、伝送線路としてのコモン線３および信号線４と、送信部５と、受信部６と、信号線４にシリアルに設けられている抵抗Ｒとを備えている。   The transmission system of FIG. 1 is configured as, for example, an R-type receiver 1 of a disaster prevention system. As the R-type receiver 1, a DC power source (for example, a DC power source that generates a DC voltage of 37V) 2 and a transmission line are used. A common line 3 and a signal line 4, a transmission unit 5, a reception unit 6, and a resistor R provided serially on the signal line 4 are provided.

ここで、直流電源２としては、交流電源（図示せず）から周知の仕方で生成されるものを用いることができる。   Here, as the DC power source 2, one generated in a known manner from an AC power source (not shown) can be used.

また、送信部５は、所定周波数の交流電流Ｉ（例えば正弦波状の交流電流（振幅が例えば２０ｍＡ））を送信信号として出力する機能を有している。より具体的に、送信部５は、図２（ａ）に示すような１．５ｋＨｚの正弦波状の電流で“１”の情報を表し、また、図２（ｂ）に示すような３ｋＨｚの正弦波状の電流で“０”の情報を表すというように、周波数変調により“１”と“０”の電流信号を出力するようになっている。   The transmitter 5 has a function of outputting an alternating current I having a predetermined frequency (for example, a sinusoidal alternating current (amplitude is, for example, 20 mA)) as a transmission signal. More specifically, the transmitter 5 represents information of “1” with a sinusoidal current of 1.5 kHz as shown in FIG. 2A, and a sine of 3 kHz as shown in FIG. A current signal of “1” and “0” is output by frequency modulation so that a wave-like current represents information of “0”.

図３には、送信部５から出力される送信信号の一例が示されている。図３の例では、送信部５から“１１１０００１０”が出力される場合が示されている。   FIG. 3 shows an example of a transmission signal output from the transmission unit 5. In the example of FIG. 3, a case where “11100010” is output from the transmission unit 5 is illustrated.

また、抵抗Ｒは、送信部５から出力される交流電流Ｉを交流電圧Ｖ（＝Ｉ・Ｒ）にするために設けられており、例えば４４０Ωの抵抗値となっている。   The resistor R is provided to make the alternating current I output from the transmission unit 5 an alternating voltage V (= IR), and has a resistance value of 440Ω, for example.

従って、送信部５から例えば“１１１”の情報が出力される場合、伝送線路の電圧波形，すなわち、信号線４−コモン線３間（ＬＯＯＰ＋とＬＯＯＰ−との間）の電圧波形は、３７Ｖの直流電圧に“１１１”に対応した交流電圧が重畳した図４に示すようなものになる。   Therefore, for example, when information of “111” is output from the transmission unit 5, the voltage waveform of the transmission line, that is, the voltage waveform between the signal line 4 and the common line 3 (between LOOP + and LOOP−) is 37V. The AC voltage corresponding to “111” is superimposed on the DC voltage as shown in FIG.

また、図１の伝送システムでは、Ｒ型受信機１からの伝送線路（コモン線３および信号線４）には、感知器（例えば火災感知器）Ｓ１〜Ｓｎが接続されている。   In the transmission system of FIG. 1, detectors (for example, fire detectors) S <b> 1 to Sn are connected to the transmission lines (common line 3 and signal line 4) from the R-type receiver 1.

ここで、各感知器Ｓ１〜Ｓｎにも、Ｒ型受信機１と同様の送信部，受信部が設けられており（図示せず）、Ｒ型受信機１の送信部５から出力された例えば“１１１”の情報（図４に示すような電圧）は、伝送線路を介して、各感知器Ｓ１〜Ｓｎの受信部で受信されるようになっている。また、各感知器Ｓ１〜Ｓｎの送信部も、Ｒ型受信機１と同様に、図２（ａ），（ｂ）に示すような正弦波形の電流で“１”，“０”の情報を出力するようになっている。より具体的には、Ｒ型受信機１の送信部５から出力された情報（正弦波形の電流信号）が図４に示すような電圧信号に変換されて伝送線路を介して各感知器Ｓ１〜Ｓｎに与えられると、各感知器Ｓ１〜Ｓｎの受信部では、Ｒ型受信機１から送られた図４に示すような電圧信号（例えば、コマンド情報）を受信して、これを判読し、その感知器では、そのコマンド情報に従った処理を行ない、その処理結果を感知器の送信部から正弦波形の電流信号として伝送線路に送信するようになっている。そして、各感知器Ｓ１〜Ｓｎの送信部から例えば図３に示したと同様の送信信号（交流電流）が出力されるとした場合、信号線４−コモン線３間（ＬＯＯＰ＋とＬＯＯＰ−との間）の電圧波形は図４に示したと同様のものとなり、この電圧は、Ｒ型受信機１の受信部６で受信されるようになっている。   Here, each of the sensors S1 to Sn is also provided with a transmission unit and a reception unit similar to those of the R-type receiver 1 (not shown), and is output from the transmission unit 5 of the R-type receiver 1, for example. The information “111” (voltage as shown in FIG. 4) is received by the receiving units of the sensors S1 to Sn via the transmission line. Similarly to the R-type receiver 1, the transmitters of the sensors S1 to Sn also display information of “1” and “0” with sinusoidal currents as shown in FIGS. 2 (a) and 2 (b). It is designed to output. More specifically, the information (sinusoidal current signal) output from the transmitter 5 of the R-type receiver 1 is converted into a voltage signal as shown in FIG. When given to Sn, the receiving unit of each of the sensors S1 to Sn receives a voltage signal (for example, command information) sent from the R-type receiver 1 as shown in FIG. The sensor performs processing according to the command information, and transmits the processing result to the transmission line as a sinusoidal current signal from the transmission unit of the sensor. Then, for example, when a transmission signal (alternating current) similar to that shown in FIG. 3 is output from the transmitters of the sensors S1 to Sn, between the signal line 4 and the common line 3 (between LOOP + and LOOP−). ) Is the same as that shown in FIG. 4, and this voltage is received by the receiving unit 6 of the R-type receiver 1.

このようにして、図１の伝送システムでは、直流電圧（例えば３７Ｖ）に情報を所定周波数の交流電圧として重畳させて（すなわち、周波数変調方式の伝送方式で）、Ｒ型受信機１と各感知器Ｓ１〜Ｓｎとの間で情報の送受信（伝送）を行なうことができる。すなわち、Ｒ型受信機１と各感知器Ｓ１〜Ｓｎとの間で、１．５ｋＨｚの正弦波形の交流電流で“１”の情報を表し、３ｋＨｚの正弦波形の交流電流で“０”の情報を表し、この１．５ｋＨｚの正弦波形の交流電流と３ｋＨｚの正弦波形の交流電流との組合せで（すなわち、“１”と“０”の組合せで）、火災情報等の通信を行なうことができる。   In this way, in the transmission system of FIG. 1, information is superimposed on a DC voltage (for example, 37V) as an AC voltage having a predetermined frequency (that is, in a frequency modulation type transmission system), and each of the R-type receiver 1 and each sensor is detected. Information can be transmitted and received (transmitted) between the devices S1 to Sn. That is, between the R-type receiver 1 and each of the sensors S1 to Sn, information of “1” is represented by an alternating current having a sinusoidal waveform of 1.5 kHz and information of “0” is represented by an alternating current having a sinusoidal waveform of 3 kHz. The combination of the 1.5 kHz sine waveform alternating current and the 3 kHz sine waveform alternating current (that is, the combination of “1” and “0”) enables communication of fire information and the like. .

なお、本件について、先行技術を調査したが、関連する文献は見つからなかった。   In addition, although prior art was investigated about this case, a related literature was not found.

しかしながら、上述した図１の伝送システムでは、伝送線路に接続される感知器Ｓ１〜Ｓｎの個数ｎ，すなわち、負荷の個数ｎが増加すると、信号線４上の直流電圧（例えば３７Ｖ）のレベルが低下してしまうという問題があった。   However, in the transmission system of FIG. 1 described above, when the number n of the sensors S1 to Sn connected to the transmission line, that is, the number n of loads increases, the level of the DC voltage (eg, 37V) on the signal line 4 increases. There was a problem of being lowered.

本発明は、伝送線路としてコモン線と信号線とを有し、情報を所定周波数の交流電流（例えば正弦波形の交流電流）として出力する送信部が伝送線路に少なくとも設けられている伝送システムにおいて、伝送線路に接続されている負荷の個数が増加しても、直流電圧のレベルが低下してしまうという事態が生ずるのを防止することの可能な伝送システムを提供することを目的としている。   In the transmission system, the transmission line includes a common line and a signal line as a transmission line, and a transmission unit that outputs information as an alternating current having a predetermined frequency (for example, an alternating current having a sine waveform) is provided in the transmission line. An object of the present invention is to provide a transmission system capable of preventing a situation in which the level of a DC voltage is lowered even when the number of loads connected to a transmission line is increased.

さらに、本発明は、伝送線路としてコモン線と信号線とを有し、情報を所定周波数の交流電流（例えば正弦波形の交流電流）として出力する送信部が伝送線路に少なくとも設けられている伝送システムにおいて、伝送線路に接続されている負荷の個数が増加しても、直流電圧のレベルが低下してしまうという事態が生ずるのを防止することができるとともに、コモンモードノイズの影響を著しく低減することの可能な伝送システムを提供することを目的としている。   Furthermore, the present invention provides a transmission system that has a common line and a signal line as a transmission line, and at least a transmission unit that outputs information as an alternating current of a predetermined frequency (for example, a sinusoidal alternating current) is provided in the transmission line. In this case, even if the number of loads connected to the transmission line increases, it is possible to prevent a situation in which the level of the DC voltage decreases, and to significantly reduce the influence of common mode noise. It aims at providing the transmission system which can be used.

上記目的を達成するために、請求項１記載の発明は、伝送線路としてコモン線と信号線とを有し、情報を所定周波数の交流電流として出力する送信部が伝送線路に少なくとも設けられている伝送システムにおいて、
前記信号線には、第１の回路が設けられ、前記コモン線にも、第２の回路が設けられ、
前記信号線に設けられている第１の回路は、信号線にソースとドレインが直列に接続された第１のＭＯＳＦＥＴ（Ｑ１）と、第１のＭＯＳＦＥＴ（Ｑ１）のドレイン・ゲート間に接続された第１の抵抗Ｒ１と、第１のＭＯＳＦＥＴ（Ｑ１）のソース・ゲート間に直列に接続された第２の抵抗Ｒ２および第１のコンデンサＣ１と、第１のＭＯＳＦＥＴ（Ｑ１）のソース・ドレイン間に並列に接続された第５の抵抗Ｒ５とからなり、前記第５の抵抗Ｒ５は、送信部から出力される所定周波数の交流電流を交流電圧に変換する手段として設けられ、前記第１のＭＯＳＦＥＴ（Ｑ１）と、前記第１の抵抗Ｒ１と、前記第２の抵抗Ｒ２と、前記第１のコンデンサＣ１とは、前記第１のＭＯＳＦＥＴ（Ｑ１）のソース・ゲート間の電位差が所定閾値以上となった場合に前記第１のＭＯＳＦＥＴ（Ｑ１）をオンとするための手段として設けられており、
前記コモン線に設けられている第２の回路は、コモン線にソースとドレインが直列に接続された第２のＭＯＳＦＥＴ（Ｑ２）と、第２のＭＯＳＦＥＴ（Ｑ２）のドレイン・ゲート間に接続された第３の抵抗Ｒ３と、第２のＭＯＳＦＥＴ（Ｑ２）のソース・ゲート間に直列に接続された第４の抵抗Ｒ４および第２のコンデンサＣ２と、第２のＭＯＳＦＥＴ（Ｑ２）のソース・ドレイン間に並列に接続された第６の抵抗Ｒ６とからなり、前記第６の抵抗Ｒ６は、送信部から出力される所定周波数の交流電流を交流電圧に変換する手段として設けられ、前記第２のＭＯＳＦＥＴ（Ｑ２）と、前記第３の抵抗Ｒ３と、前記第４の抵抗Ｒ４と、前記第２のコンデンサＣ２とは、前記第２のＭＯＳＦＥＴ（Ｑ２）のソース・ゲート間の電位差が所定閾値以上となった場合に前記第２のＭＯＳＦＥＴ（Ｑ２）をオンとするための手段として設けられており、
前記第１の回路の第１のＭＯＳＦＥＴ（Ｑ１）と前記第２の回路の第２のＭＯＳＦＥＴ（Ｑ２）には、同じ特性のものが用いられ、前記第１の回路の第１の抵抗Ｒ１と前記第２の回路の第３の抵抗Ｒ３とは、同じ抵抗値であり、前記第１の回路の第２の抵抗Ｒ２と前記第２の回路の第４の抵抗Ｒ４とは、同じ抵抗値であり、前記第１の回路の第１のコンデンサＣ１と前記第２の回路の第２のコンデンサＣ２とは、同じ容量値であり、前記第１の回路の第５の抵抗Ｒ５と前記第２の回路の第６の抵抗Ｒ６とは、同じ抵抗値であって、
前記第１の回路と前記第２の回路とは、分離独立していることを特徴としている。 In order to achieve the above object, the invention according to claim 1 has a common line and a signal line as a transmission line, and at least a transmission unit that outputs information as an alternating current of a predetermined frequency is provided in the transmission line. In transmission systems,
To the signal line, the first circuit is provided to the common line, the second circuit is provided,
The first circuit provided in the signal line is connected between the drain and gate of the first MOSFET (Q1) having the source and drain connected in series to the signal line and the first MOSFET (Q1). The first resistor R1, the second resistor R2 and the first capacitor C1 connected in series between the source and gate of the first MOSFET (Q1), and the source and drain of the first MOSFET (Q1) A fifth resistor R5 connected in parallel between the first resistor R5 and the fifth resistor R5. The fifth resistor R5 is provided as a means for converting an alternating current having a predetermined frequency output from the transmitter into an alternating voltage. The MOSFET (Q1), the first resistor R1, the second resistor R2, and the first capacitor C1 have a potential difference between the source and the gate of the first MOSFET (Q1) equal to or greater than a predetermined threshold. When Is provided as a means for turning on said first MOSFET (Q1) when Tsu,
The second circuit provided on the common line is connected between the drain and gate of the second MOSFET (Q2) having the source and drain connected in series to the common line and the second MOSFET (Q2). The third resistor R3, the fourth resistor R4 and the second capacitor C2 connected in series between the source and gate of the second MOSFET (Q2), and the source and drain of the second MOSFET (Q2) A sixth resistor R6 connected in parallel therebetween, the sixth resistor R6 being provided as means for converting an alternating current of a predetermined frequency output from the transmitter into an alternating voltage, and the second resistor a MOSFET (Q2), and the third resistor R3, and the fourth resistor R4, the the second capacitor C2, a potential difference is given threshold than between the source and gate of the second MOSFET (Q2) Is provided as a means for turning on said second MOSFET (Q2) when a,
The first MOSFET (Q1) of the first circuit and the second MOSFET (Q2) of the second circuit have the same characteristics, and the first resistor R1 of the first circuit and The third resistor R3 of the second circuit has the same resistance value, and the second resistor R2 of the first circuit and the fourth resistor R4 of the second circuit have the same resistance value. The first capacitor C1 of the first circuit and the second capacitor C2 of the second circuit have the same capacitance value, and the fifth resistor R5 of the first circuit and the second capacitor C2 The sixth resistor R6 of the circuit has the same resistance value,
The first circuit and the second circuit are separated and independent.

請求項１記載の発明によれば、伝送線路としてコモン線と信号線とを有し、情報を所定周波数の交流電流として出力する送信部が伝送線路に少なくとも設けられている伝送システムにおいて、
前記信号線には、第１の回路が設けられ、前記コモン線にも、第２の回路が設けられ、
前記信号線に設けられている第１の回路は、信号線にソースとドレインが直列に接続された第１のＭＯＳＦＥＴ（Ｑ１）と、第１のＭＯＳＦＥＴ（Ｑ１）のドレイン・ゲート間に接続された第１の抵抗Ｒ１と、第１のＭＯＳＦＥＴ（Ｑ１）のソース・ゲート間に直列に接続された第２の抵抗Ｒ２および第１のコンデンサＣ１と、第１のＭＯＳＦＥＴ（Ｑ１）のソース・ドレイン間に並列に接続された第５の抵抗Ｒ５とからなり、前記第５の抵抗Ｒ５は、送信部から出力される所定周波数の交流電流を交流電圧に変換する手段として設けられ、前記第１のＭＯＳＦＥＴ（Ｑ１）と、前記第１の抵抗Ｒ１と、前記第２の抵抗Ｒ２と、前記第１のコンデンサＣ１とは、前記第１のＭＯＳＦＥＴ（Ｑ１）のソース・ゲート間の電位差が所定閾値以上となった場合に前記第１のＭＯＳＦＥＴ（Ｑ１）をオンとするための手段として設けられており、
前記コモン線に設けられている第２の回路は、コモン線にソースとドレインが直列に接続された第２のＭＯＳＦＥＴ（Ｑ２）と、第２のＭＯＳＦＥＴ（Ｑ２）のドレイン・ゲート間に接続された第３の抵抗Ｒ３と、第２のＭＯＳＦＥＴ（Ｑ２）のソース・ゲート間に直列に接続された第４の抵抗Ｒ４および第２のコンデンサＣ２と、第２のＭＯＳＦＥＴ（Ｑ２）のソース・ドレイン間に並列に接続された第６の抵抗Ｒ６とからなり、前記第６の抵抗Ｒ６は、送信部から出力される所定周波数の交流電流を交流電圧に変換する手段として設けられ、前記第２のＭＯＳＦＥＴ（Ｑ２）と、前記第３の抵抗Ｒ３と、前記第４の抵抗Ｒ４と、前記第２のコンデンサＣ２とは、前記第２のＭＯＳＦＥＴ（Ｑ２）のソース・ゲート間の電位差が所定閾値以上となった場合に前記第２のＭＯＳＦＥＴ（Ｑ２）をオンとするための手段として設けられており、
前記第１の回路の第１のＭＯＳＦＥＴ（Ｑ１）と前記第２の回路の第２のＭＯＳＦＥＴ（Ｑ２）には、同じ特性のものが用いられ、前記第１の回路の第１の抵抗Ｒ１と前記第２の回路の第３の抵抗Ｒ３とは、同じ抵抗値であり、前記第１の回路の第２の抵抗Ｒ２と前記第２の回路の第４の抵抗Ｒ４とは、同じ抵抗値であり、前記第１の回路の第１のコンデンサＣ１と前記第２の回路の第２のコンデンサＣ２とは、同じ容量値であり、前記第１の回路の第５の抵抗Ｒ５と前記第２の回路の第６の抵抗Ｒ６とは、同じ抵抗値であって、
前記第１の回路と前記第２の回路とは、分離独立しているので、伝送線路に接続されている負荷の個数が増加しても、直流電圧のレベルが低下してしまうという事態が生ずるのを防止することができるとともに、コモンモードノイズの影響を著しく低減することができる。 According to the first aspect of the present invention, in the transmission system, the transmission line has a common line and a signal line as a transmission line, and a transmission unit that outputs information as an alternating current of a predetermined frequency is provided at least in the transmission line.
The signal line is provided with a first circuit, and the common line is also provided with a second circuit,
The first circuit provided in the signal line is connected between the drain and gate of the first MOSFET (Q1) having the source and drain connected in series to the signal line and the first MOSFET (Q1). The first resistor R1, the second resistor R2 and the first capacitor C1 connected in series between the source and gate of the first MOSFET (Q1), and the source and drain of the first MOSFET (Q1) A fifth resistor R5 connected in parallel between the first resistor R5 and the fifth resistor R5. The fifth resistor R5 is provided as a means for converting an alternating current having a predetermined frequency output from the transmitter into an alternating voltage. The MOSFET (Q1), the first resistor R1, the second resistor R2, and the first capacitor C1 have a potential difference between the source and the gate of the first MOSFET (Q1) equal to or greater than a predetermined threshold. When Is provided as a means for turning on said first MOSFET (Q1) when Tsu,
The second circuit provided on the common line is connected between the drain and gate of the second MOSFET (Q2) having the source and drain connected in series to the common line and the second MOSFET (Q2). The third resistor R3, the fourth resistor R4 and the second capacitor C2 connected in series between the source and gate of the second MOSFET (Q2), and the source and drain of the second MOSFET (Q2) A sixth resistor R6 connected in parallel therebetween, the sixth resistor R6 being provided as means for converting an alternating current of a predetermined frequency output from the transmitter into an alternating voltage, and the second resistor The MOSFET (Q2), the third resistor R3, the fourth resistor R4, and the second capacitor C2 have a potential difference between the source and gate of the second MOSFET (Q2) that is less than a predetermined threshold. Is provided as a means for turning on said second MOSFET (Q2) when a,
The first MOSFET (Q1) of the first circuit and the second MOSFET (Q2) of the second circuit have the same characteristics, and the first resistor R1 of the first circuit and The third resistor R3 of the second circuit has the same resistance value, and the second resistor R2 of the first circuit and the fourth resistor R4 of the second circuit have the same resistance value. The first capacitor C1 of the first circuit and the second capacitor C2 of the second circuit have the same capacitance value, and the fifth resistor R5 of the first circuit and the second capacitor C2 The sixth resistor R6 of the circuit has the same resistance value,
Since the first circuit and the second circuit are separated and independent, even if the number of loads connected to the transmission line increases, a situation occurs in which the DC voltage level decreases. Can be prevented, and the influence of common mode noise can be significantly reduced.

以下、本発明を実施するための最良の形態を図面に基づいて説明する。   Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

（第１の形態）
図５は、本発明の第１の形態の伝送システムの構成例を示す図である。なお、図５において、図１と同様の箇所には同じ符号を用いている。図５の伝送システムは、例えば防災システムのＲ型受信機１０１として構成されており、Ｒ型受信機１０１として、直流電源（例えば３７Ｖの直流電圧を発生する直流電源）２と、伝送線路としてのコモン線３および信号線４と、送信部５と、受信部６と、信号線４に設けられている回路１１とを備えている。 (First form)
FIG. 5 is a diagram illustrating a configuration example of the transmission system according to the first embodiment of this invention. In FIG. 5, the same reference numerals are used for the same parts as in FIG. The transmission system of FIG. 5 is configured as, for example, an R-type receiver 101 of a disaster prevention system. A common line 3 and a signal line 4, a transmission unit 5, a reception unit 6, and a circuit 11 provided in the signal line 4 are provided.

ここで、直流電源２としては、交流電源（図示せず）から周知の仕方で生成されるものを用いることができる。   Here, as the DC power source 2, one generated in a known manner from an AC power source (not shown) can be used.

また、送信部５は、所定周波数の交流電流Ｉ（例えば正弦波状の交流電流（振幅が例えば２０ｍＡ））を送信信号として出力する機能を有している。より具体的に、送信部５は、図２（ａ）に示すような１．５ｋＨｚの正弦波状の電流で“１”の情報を表し、また、図２（ｂ）に示すような３ｋＨｚの正弦波状の電流で“０”の情報を表すというように、周波数変調により“１”と“０”の電流信号を出力するようになっている。   The transmitter 5 has a function of outputting an alternating current I having a predetermined frequency (for example, a sinusoidal alternating current (amplitude is, for example, 20 mA)) as a transmission signal. More specifically, the transmitter 5 represents information of “1” with a sinusoidal current of 1.5 kHz as shown in FIG. 2A, and a sine of 3 kHz as shown in FIG. A current signal of “1” and “0” is output by frequency modulation so that a wave-like current represents information of “0”.

また、回路１１は、送信部から出力される所定周波数の交流電流を交流電圧に変換する手段と、直流電圧を安定して供給するための手段とを備えている。   The circuit 11 includes means for converting an alternating current having a predetermined frequency output from the transmission unit into an alternating voltage, and means for stably supplying the direct current voltage.

回路１１において、送信部から出力される所定周波数の交流電流を交流電圧に変換する手段は、図５の例では、抵抗Ｒ５（抵抗値は例えば４４０Ω）として構成されている。すなわち、回路１１において、抵抗Ｒ５は、図１の抵抗Ｒに対応するものであって、送信部５から出力される交流電流Ｉを交流電圧Ｖ（＝Ｉ・Ｒ５）にするために設けられている。   In the circuit 11, means for converting an alternating current having a predetermined frequency output from the transmission unit into an alternating voltage is configured as a resistor R5 (resistance value is 440Ω, for example) in the example of FIG. That is, in the circuit 11, the resistor R5 corresponds to the resistor R in FIG. 1 and is provided to change the alternating current I output from the transmitter 5 to the alternating voltage V (= I · R5). Yes.

従って、図５の伝送システムにおいても、送信部５から例えば“１１１”の情報が出力される場合、伝送線路の電圧波形，すなわち、信号線４−コモン線３間（ＬＯＯＰ＋とＬＯＯＰ−との間）の電圧波形は、３７Ｖの直流電圧に“１１１”に対応した交流電圧が重畳した図４に示すようなものになる。   Therefore, also in the transmission system of FIG. 5, when information of “111” is output from the transmission unit 5, for example, the voltage waveform of the transmission line, that is, between the signal line 4 and the common line 3 (between LOOP + and LOOP−). The voltage waveform of) is as shown in FIG. 4 in which an AC voltage corresponding to “111” is superimposed on a 37 V DC voltage.

しかしながら、回路１１が抵抗Ｒ５だけの場合（すなわち、実質的に図１と同様の構成の場合）、前述したように、伝送線路に接続される感知器Ｓ１〜Ｓｎの個数ｎ，すなわち、負荷の個数ｎが増加すると、信号線４上の直流電圧（３７Ｖ）のレベルが低下してしまうという問題がある。   However, when the circuit 11 has only the resistor R5 (that is, the configuration substantially similar to that of FIG. 1), as described above, the number n of the sensors S1 to Sn connected to the transmission line, that is, the load When the number n increases, there is a problem that the level of the DC voltage (37 V) on the signal line 4 is lowered.

この問題を解決するため、回路１１には、直流電圧を安定して供給するための手段が設けられている。   In order to solve this problem, the circuit 11 is provided with means for stably supplying a DC voltage.

回路１１において、直流電圧を安定して供給するための手段は、図５の例では、ＭＯＳＦＥＴ（Ｑ１）と、抵抗Ｒ１（抵抗値が例えば１０ＭΩ）と、抵抗Ｒ２（抵抗値が例えば３３Ω）と、キャパシタＣ１（容量値が例えば２２０ｎＦ）とにより構成されている。   In the circuit 11, means for stably supplying a direct current voltage in the circuit 11 includes a MOSFET (Q 1), a resistor R 1 (with a resistance value of, for example, 10 MΩ), and a resistor R 2 (with a resistance value of, for example, 33Ω). And capacitor C1 (capacitance value is, for example, 220 nF).

このような構成では、ＭＯＳＦＥＴ（Ｑ１）は通常はオフの状態にあるが（従って、通常の場合には、回路１１は等価的に抵抗Ｒ５だけのものとなっているが）、例えば感知器Ｓ１〜Ｓｎの個数ｎが増加して信号線４上の直流電圧が３７Ｖから低下し、ＭＯＳＦＥＴ（Ｑ１）のソース（Ｓ）とゲート（Ｇ）との間の電位差が所定閾値以上になると、ＭＯＳＦＥＴ（Ｑ１）がオンになり、直流電源２からの直流電圧３７Ｖが信号線４に供給される。これにより、伝送線路に接続されている負荷の個数が増加しても、直流電圧のレベルが低下してしまうという事態が生ずるのを防止することができる。すなわち、直流電圧の安定化を図ることができる。   In such a configuration, the MOSFET (Q1) is normally in the off state (thus, in the normal case, the circuit 11 is equivalent to only the resistor R5), for example, the sensor S1. When the number n of .about.Sn increases and the DC voltage on the signal line 4 decreases from 37 V, and the potential difference between the source (S) and the gate (G) of the MOSFET (Q1) exceeds a predetermined threshold value, the MOSFET ( Q1) is turned on, and the DC voltage 37 V from the DC power supply 2 is supplied to the signal line 4. Thereby, even if the number of loads connected to the transmission line increases, it is possible to prevent a situation in which the level of the DC voltage is lowered. That is, the DC voltage can be stabilized.

なお、図５の構成例では、伝送システムは防災システムであるとしたが、伝送システムは、防災システムに限定されることはなく、防犯システムとして構成されても良いし、他の任意のシステムとして構成されても良い。   In the configuration example of FIG. 5, the transmission system is a disaster prevention system. However, the transmission system is not limited to the disaster prevention system, and may be configured as a security system, or as any other system. It may be configured.

また、図５の構成例において、回路１１の構成要素（抵抗Ｒ５，ＭＯＳＦＥＴ（Ｑ１）など），回路定数（抵抗値，容量値など）は、図５の例に限定されることなく、適宜変更可能である。例えば、ＭＯＳＦＥＴのかわりにバイポーラトランジスタなどを用いることもできる。   In the configuration example of FIG. 5, the components of the circuit 11 (resistor R5, MOSFET (Q1), etc.) and circuit constants (resistance value, capacitance value, etc.) are not limited to the example of FIG. Is possible. For example, a bipolar transistor or the like can be used instead of the MOSFET.

換言すれば、本発明の第１の形態の伝送システムは、伝送線路としてコモン線と信号線とを有し、情報を所定周波数の交流電流として出力する送信部が伝送線路に少なくとも設けられている伝送システムであって、送信部から出力される所定周波数の交流電流を交流電圧に変換する手段と、直流電圧を安定して供給するための手段とを備えた回路が、信号線に設けられている構成のものであれば良い。   In other words, the transmission system according to the first aspect of the present invention has a common line and a signal line as a transmission line, and at least a transmission unit that outputs information as an alternating current of a predetermined frequency is provided in the transmission line. In the transmission system, a circuit including a means for converting an alternating current of a predetermined frequency output from the transmission unit into an alternating voltage and a means for stably supplying the direct current voltage is provided on the signal line. Any configuration is acceptable.

このような構成によって、伝送線路に接続されている負荷の個数が増加しても、直流電圧のレベルが低下してしまうという事態が生ずるのを防止することができる。   With such a configuration, even if the number of loads connected to the transmission line increases, it is possible to prevent a situation in which the level of the DC voltage decreases.

（第２の形態）
しかしながら、上述した第１の形態の伝送システム（図５の伝送システム）は、コモンモードノイズの影響を受けるという問題がある。 (Second form)
However, the transmission system of the first embodiment (the transmission system of FIG. 5) described above has a problem that it is affected by common mode noise.

ここで、コモンモードノイズとは、図６に示すように、信号線４，コモン線３と基準大地面（ＧＮＤ）との間に発生するノイズである。なお、図６中、矢印はノイズ電流の向きであり、コモンモードノイズでは、信号線４に流れるノイズ電流の向きとコモン線３に流れるノイズ電流の向きとは、同じとなる。   Here, the common mode noise is noise generated between the signal line 4 and the common line 3 and the reference ground plane (GND) as shown in FIG. In FIG. 6, the arrow indicates the direction of the noise current. In common mode noise, the direction of the noise current flowing through the signal line 4 is the same as the direction of the noise current flowing through the common line 3.

実際、図５の伝送システムに対して、図７に示すようにして、信号線４（ＬＯＯＰ＋）とコモン線３（ＬＯＯＰ−）とに、それぞれ、キャパシタＣ０を介してノイズ源５０からコモンモードノイズを発生させたところ（具体的に、ＩＥＣ６１０００−４−６およびＩＥＣ６１０００−４−３の規格に準じて、振幅４Ｖ，周波数９ｋＨｚにＡＭ変調１ｋＨｚ８０％のコモンモードノイズをＬＯＯＰ＋とＬＯＯＰ−との間に印加すると）、信号線４−コモン線３間（ＬＯＯＰ＋とＬＯＯＰ−との間）の図４に対応する電圧信号は、図８に示すように、ノイズが重畳したものとなった。このノイズは、受信部（例えば感知器の受信部）で信号が受信されたとき、受信部において誤作動（誤検出）を引き起こすことがある。   In fact, for the transmission system of FIG. 5, as shown in FIG. 7, the signal line 4 (LOOP +) and the common line 3 (LOOP−) are respectively connected to the common mode noise from the noise source 50 via the capacitor C0. (Specifically, according to the standards of IEC61000-4-6 and IEC61000-4-3, common mode noise of AM modulation 1 kHz 80% with amplitude 4V and frequency 9kHz is between LOOP + and LOOP-. When applied), the voltage signal corresponding to FIG. 4 between the signal line 4 and the common line 3 (between LOOP + and LOOP−) has a superimposed noise as shown in FIG. This noise may cause a malfunction (false detection) in the receiving unit when a signal is received by the receiving unit (for example, the receiving unit of the sensor).

本願の発明者等は、図５の伝送システムを図９に示すものにすると（Ｒ型受信機１０１をＲ型受信機２０１にすると）、上述したコモンモードノイズの影響を低減することができることを見出した。   If the transmission system of FIG. 5 is the one shown in FIG. 9 (when the R-type receiver 101 is changed to the R-type receiver 201), the inventors of the present application can reduce the influence of the common mode noise described above. I found it.

すなわち、図９の伝送システムは、図５の伝送システムに対して、コモン線３にも、回路１１と同様の回路１２を設けている。すなわち、回路１２も、回路１１と同様に、送信部から出力される所定周波数の交流電流を交流電圧に変換する手段と、直流電圧を安定して供給するための手段とを備えている。   That is, the transmission system in FIG. 9 is provided with a circuit 12 similar to the circuit 11 in the common line 3 as compared with the transmission system in FIG. That is, similarly to the circuit 11, the circuit 12 includes means for converting an alternating current of a predetermined frequency output from the transmission unit into an alternating voltage, and means for stably supplying the direct current voltage.

ここで、回路１２の構成および回路定数等は、回路１１と同じであるのが望ましく、図９の例では、回路１１，回路１２において、送信部から出力される所定周波数の交流電流を交流電圧に変換する手段は、それぞれ、抵抗Ｒ５（抵抗値が例えば２２０Ω），抵抗Ｒ６（抵抗値が例えば２２０Ω）となっている。すなわち、抵抗Ｒ５，Ｒ６は、図１の例の抵抗Ｒに対応するものであって、送信部５から出力される交流電流Ｉを交流電圧Ｖ（＝Ｉ・（Ｒ５＋Ｒ６））にするために設けられている。   Here, the configuration, circuit constants, and the like of the circuit 12 are preferably the same as those of the circuit 11. In the example of FIG. 9, in the circuits 11 and 12, an alternating current having a predetermined frequency output from the transmission unit is converted into an alternating voltage. The means for converting into the resistance R5 (resistance value is 220Ω, for example) and the resistance R6 (resistance value is 220Ω, for example), respectively. That is, the resistors R5 and R6 correspond to the resistor R in the example of FIG. 1 and are provided to make the alternating current I output from the transmitter 5 into the alternating voltage V (= I · (R5 + R6)). It has been.

従って、図９の例においても、送信部５から例えば“１１１”の情報が出力される場合、伝送線路の電圧波形，すなわち、信号線４−コモン線３間（ＬＯＯＰ＋とＬＯＯＰ−との間）の電圧波形は、３７Ｖの直流電圧に“１１１”に対応した交流電圧が重畳した図４に示すようなものになる。   Therefore, also in the example of FIG. 9, for example, when information of “111” is output from the transmission unit 5, the voltage waveform of the transmission line, that is, between the signal line 4 and the common line 3 (between LOOP + and LOOP−). The voltage waveform is as shown in FIG. 4 in which an AC voltage corresponding to “111” is superimposed on a DC voltage of 37V.

また、回路１２において、直流電圧を安定して供給するための手段は、図９の例では、ＭＯＳＦＥＴ（Ｑ２）と、抵抗Ｒ３（抵抗値が例えば１０ＭΩ）と、抵抗Ｒ４（抵抗値が例えば３３Ω）と、キャパシタＣ２（容量値が例えば２２０ｎＦ）とにより構成されている。ここで、ＭＯＳＦＥＴ（Ｑ２）には、ＭＯＳＦＥＴ（Ｑ１）と同じ特性のものが用いられるのが望ましい。   Further, in the example of FIG. 9, in the circuit 12, the means for stably supplying the DC voltage in the circuit 12 is the MOSFET (Q2), the resistor R3 (resistance value is 10 MΩ, for example), and the resistor R4 (resistance value is 33Ω, for example). ) And a capacitor C2 (capacitance value is, for example, 220 nF). Here, it is desirable to use the MOSFET (Q2) having the same characteristics as the MOSFET (Q1).

本願の発明者は、図９の伝送システムを構築して調べたところ、図９の構成においても、図５の場合と同様に、伝送線路に接続されている負荷の個数が増加しても、直流電圧のレベルが低下してしまうという事態が生ずるのを防止することができた。   The inventor of the present application constructed and investigated the transmission system of FIG. 9, and even in the configuration of FIG. 9, as in the case of FIG. 5, even if the number of loads connected to the transmission line increases, It was possible to prevent the situation that the level of the DC voltage was lowered.

さらに、本願の発明者は、構築した図９の伝送システムに対して、図１０に示すようにして、信号線４（ＬＯＯＰ＋）とコモン線３（ＬＯＯＰ−）とに、それぞれ、キャパシタＣ０を介してノイズ源５０からコモンモードノイズを発生させたところ（具体的に、ＩＥＣ６１０００−４−６およびＩＥＣ６１０００−４−３の規格に準じて、振幅４Ｖ，周波数９ｋＨｚにＡＭ変調１ｋＨｚ８０％のコモンモードノイズをＬＯＯＰ＋とＬＯＯＰ−との間に印加すると）、信号線４−コモン線３間（ＬＯＯＰ＋とＬＯＯＰ−との間）の図４に対応する電圧信号は、図１１に示すように、ノイズの影響を受けないことがわかった。   Further, the inventor of the present application adds the signal line 4 (LOOP +) and the common line 3 (LOOP−) via the capacitor C0 to the constructed transmission system of FIG. 9 as shown in FIG. When common mode noise is generated from the noise source 50 (specifically, in accordance with the standards of IEC61000-4-6 and IEC61000-4-3, common mode noise of AM modulation 1 kHz 80% at an amplitude of 4 V and a frequency of 9 kHz is obtained. When applied between LOOP + and LOOP−), the voltage signal corresponding to FIG. 4 between the signal line 4 and the common line 3 (between LOOP + and LOOP−) is affected by noise as shown in FIG. I knew I would n’t.

このように、図９の構成の伝送システムでは、伝送線路に接続されている負荷の個数が増加しても、直流電圧のレベルが低下してしまうという事態が生ずるのを防止することができるとともに、コモンモードノイズの影響をほぼ完全になくすことができた。   As described above, in the transmission system having the configuration of FIG. 9, it is possible to prevent a situation in which the level of the DC voltage is lowered even when the number of loads connected to the transmission line is increased. The effect of common mode noise was almost completely eliminated.

なお、図９の構成例では、伝送システムは防災システムであるとしたが、伝送システムは、防災システムに限定されることはなく、防犯システムとして構成されても良いし、他の任意のシステムとして構成されても良い。   In the configuration example of FIG. 9, the transmission system is a disaster prevention system. However, the transmission system is not limited to the disaster prevention system, and may be configured as a crime prevention system, or as any other system. It may be configured.

また、図９の構成例において、回路１１，１２の構成要素（抵抗Ｒ５，Ｒ６，ＭＯＳＦＥＴ（Ｑ１），ＭＯＳＦＥＴ（Ｑ２）など），回路定数（抵抗値，容量値など）は、図９の例に限定されることなく、適宜変更可能である。例えば、ＭＯＳＦＥＴのかわりにバイポーラトランジスタなどを用いることもできる。   Further, in the configuration example of FIG. 9, the components (resistors R5, R6, MOSFET (Q1), MOSFET (Q2), etc.) and circuit constants (resistance value, capacitance value, etc.) of the circuits 11, 12 are the same as those in FIG. Without being limited thereto, it can be changed as appropriate. For example, a bipolar transistor or the like can be used instead of the MOSFET.

換言すれば、本発明の第２の形態の伝送システムは、伝送線路としてコモン線と信号線とを有し、情報を所定周波数の交流電流として出力する送信部が伝送線路に少なくとも設けられている伝送システムにおいて、送信部から出力される所定周波数の交流電流を交流電圧に変換する手段と、直流電圧を安定して供給するための手段とを備えた回路が、コモン線と信号線との両方に設けられている構成のものであれば良い。   In other words, the transmission system according to the second aspect of the present invention has a common line and a signal line as a transmission line, and at least a transmission unit that outputs information as an alternating current of a predetermined frequency is provided in the transmission line. In a transmission system, a circuit including means for converting an alternating current of a predetermined frequency output from a transmission unit into an alternating voltage and means for stably supplying a direct current voltage includes both a common line and a signal line. Any configuration may be used as long as it is provided.

このような構成によって、伝送線路に接続されている負荷の個数が増加しても、直流電圧のレベルが低下してしまうという事態が生ずるのを防止することができるとともに、コモンモードノイズの影響を著しく低減することができる。   With such a configuration, even if the number of loads connected to the transmission line is increased, it is possible to prevent a situation in which the level of the DC voltage is lowered and to prevent the influence of common mode noise. It can be significantly reduced.

但し、コモンモードノイズの影響をほぼ完全になくすためには、信号線に設けられる回路とコモン線に設けられる回路とは、回路の構成および回路定数等が同一のものとなっているのが良い。   However, in order to eliminate the influence of common mode noise almost completely, the circuit provided on the signal line and the circuit provided on the common line should have the same circuit configuration and circuit constants. .

これは、信号線に設けられる回路とコモン線に設けられる回路とを、回路の構成および回路定数等が同一のものにすると、信号線上のノイズとコモン線上のノイズとが互いに相殺されて、ノイズの影響がほぼ完全になくなるためと考えられる。   This is because when the circuit provided on the signal line and the circuit provided on the common line have the same circuit configuration and circuit constants, the noise on the signal line and the noise on the common line cancel each other out. This is considered to be because the influence of the is almost completely eliminated.

このように、信号線に設けられる回路とコモン線に設けられる回路とを、回路の構成および回路定数等が同一のものにすることで、コモンモードノイズの影響をほぼ完全になくすことができる。   Thus, by making the circuit provided on the signal line and the circuit provided on the common line the same in circuit configuration, circuit constants, etc., the influence of common mode noise can be almost completely eliminated.

本発明の伝送システムは、防災システム（例えば、火災検知システムのＲ型受信機）や防犯システムなどに利用される。
The transmission system of the present invention is used in a disaster prevention system (for example, an R-type receiver of a fire detection system), a security system, or the like.

従来の伝送システムの構成例を示す図である。It is a figure which shows the structural example of the conventional transmission system. 情報の表し方を示す図である。It is a figure which shows how to represent information. 送信信号の一例を示す図である。It is a figure which shows an example of a transmission signal. “１１１”の情報を示す図である。It is a figure which shows the information of "111". 本発明の第１の形態の伝送システムの構成例を示す図である。It is a figure which shows the structural example of the transmission system of the 1st form of this invention. コモンモードノイズを説明するための図である。It is a figure for demonstrating common mode noise. 図５の伝送システムに対してコモンモードノイズを発生させる仕方を示す図である。FIG. 6 is a diagram showing how to generate common mode noise for the transmission system of FIG. 5. 図５の伝送システムにおいてノイズが重畳した電圧信号を示す図である。FIG. 6 is a diagram illustrating a voltage signal on which noise is superimposed in the transmission system of FIG. 5. 本発明の第２の形態の伝送システムの構成例を示す図である。It is a figure which shows the structural example of the transmission system of the 2nd form of this invention. 図９の伝送システムに対してコモンモードノイズを発生させる仕方を示す図である。It is a figure which shows how to generate common mode noise with respect to the transmission system of FIG. 図９の伝送システムにおいてコモンモードノイズの影響を受けていない電圧信号を示す図である。It is a figure which shows the voltage signal which is not influenced by the common mode noise in the transmission system of FIG.

符号の説明Explanation of symbols

１０１，２０１ Ｒ型受信機
２ 直流電源
３ コモン線
４ 信号線
５ 送信部
６ 受信部
１１，１２ 回路
５０ ノイズ源
Ｓ１〜Ｓｎ 感知器（負荷）
101, 201 R-type receiver 2 DC power source 3 Common line 4 Signal line 5 Transmitter 6 Receiver 11 and 12 Circuit 50 Noise source S1 to Sn sensor (load)

Claims (1)

伝送線路としてコモン線と信号線とを有し、情報を所定周波数の交流電流として出力する送信部が伝送線路に少なくとも設けられている伝送システムにおいて、
前記信号線には、第１の回路が設けられ、前記コモン線にも、第２の回路が設けられ、
前記信号線に設けられている第１の回路は、信号線にソースとドレインが直列に接続された第１のＭＯＳＦＥＴ（Ｑ１）と、第１のＭＯＳＦＥＴ（Ｑ１）のドレイン・ゲート間に接続された第１の抵抗Ｒ１と、第１のＭＯＳＦＥＴ（Ｑ１）のソース・ゲート間に直列に接続された第２の抵抗Ｒ２および第１のコンデンサＣ１と、第１のＭＯＳＦＥＴ（Ｑ１）のソース・ドレイン間に並列に接続された第５の抵抗Ｒ５とからなり、前記第５の抵抗Ｒ５は、送信部から出力される所定周波数の交流電流を交流電圧に変換する手段として設けられ、前記第１のＭＯＳＦＥＴ（Ｑ１）と、前記第１の抵抗Ｒ１と、前記第２の抵抗Ｒ２と、前記第１のコンデンサＣ１とは、前記第１のＭＯＳＦＥＴ（Ｑ１）のソース・ゲート間の電位差が所定閾値以上となった場合に前記第１のＭＯＳＦＥＴ（Ｑ１）をオンとするための手段として設けられており、
前記コモン線に設けられている第２の回路は、コモン線にソースとドレインが直列に接続された第２のＭＯＳＦＥＴ（Ｑ２）と、第２のＭＯＳＦＥＴ（Ｑ２）のドレイン・ゲート間に接続された第３の抵抗Ｒ３と、第２のＭＯＳＦＥＴ（Ｑ２）のソース・ゲート間に直列に接続された第４の抵抗Ｒ４および第２のコンデンサＣ２と、第２のＭＯＳＦＥＴ（Ｑ２）のソース・ドレイン間に並列に接続された第６の抵抗Ｒ６とからなり、前記第６の抵抗Ｒ６は、送信部から出力される所定周波数の交流電流を交流電圧に変換する手段として設けられ、前記第２のＭＯＳＦＥＴ（Ｑ２）と、前記第３の抵抗Ｒ３と、前記第４の抵抗Ｒ４と、前記第２のコンデンサＣ２とは、前記第２のＭＯＳＦＥＴ（Ｑ２）のソース・ゲート間の電位差が所定閾値以上となった場合に前記第２のＭＯＳＦＥＴ（Ｑ２）をオンとするための手段として設けられており、
前記第１の回路の第１のＭＯＳＦＥＴ（Ｑ１）と前記第２の回路の第２のＭＯＳＦＥＴ（Ｑ２）には、同じ特性のものが用いられ、前記第１の回路の第１の抵抗Ｒ１と前記第２の回路の第３の抵抗Ｒ３とは、同じ抵抗値であり、前記第１の回路の第２の抵抗Ｒ２と前記第２の回路の第４の抵抗Ｒ４とは、同じ抵抗値であり、前記第１の回路の第１のコンデンサＣ１と前記第２の回路の第２のコンデンサＣ２とは、同じ容量値であり、前記第１の回路の第５の抵抗Ｒ５と前記第２の回路の第６の抵抗Ｒ６とは、同じ抵抗値であって、
前記第１の回路と前記第２の回路とは、分離独立していることを特徴とする伝送システム。 In a transmission system that has a common line and a signal line as a transmission line, and at least a transmission unit that outputs information as an alternating current of a predetermined frequency is provided in the transmission line.
To the signal line, the first circuit is provided to the common line, the second circuit is provided,
The first circuit provided in the signal line is connected between the drain and gate of the first MOSFET (Q1) having the source and drain connected in series to the signal line and the first MOSFET (Q1). The first resistor R1, the second resistor R2 and the first capacitor C1 connected in series between the source and gate of the first MOSFET (Q1), and the source and drain of the first MOSFET (Q1) A fifth resistor R5 connected in parallel between the first resistor R5 and the fifth resistor R5. The fifth resistor R5 is provided as a means for converting an alternating current having a predetermined frequency output from the transmitter into an alternating voltage. The MOSFET (Q1), the first resistor R1, the second resistor R2, and the first capacitor C1 have a potential difference between the source and the gate of the first MOSFET (Q1) equal to or greater than a predetermined threshold. When Is provided as a means for turning on said first MOSFET (Q1) when Tsu,
The second circuit provided on the common line is connected between the drain and gate of the second MOSFET (Q2) having the source and drain connected in series to the common line and the second MOSFET (Q2). The third resistor R3, the fourth resistor R4 and the second capacitor C2 connected in series between the source and gate of the second MOSFET (Q2), and the source and drain of the second MOSFET (Q2) A sixth resistor R6 connected in parallel therebetween, the sixth resistor R6 being provided as means for converting an alternating current of a predetermined frequency output from the transmitter into an alternating voltage, and the second resistor a MOSFET (Q2), and the third resistor R3, and the fourth resistor R4, the the second capacitor C2, a potential difference is given threshold than between the source and gate of the second MOSFET (Q2) Is provided as a means for turning on said second MOSFET (Q2) when a,
The first MOSFET (Q1) of the first circuit and the second MOSFET (Q2) of the second circuit have the same characteristics, and the first resistor R1 of the first circuit and The third resistor R3 of the second circuit has the same resistance value, and the second resistor R2 of the first circuit and the fourth resistor R4 of the second circuit have the same resistance value. The first capacitor C1 of the first circuit and the second capacitor C2 of the second circuit have the same capacitance value, and the fifth resistor R5 of the first circuit and the second capacitor C2 The sixth resistor R6 of the circuit has the same resistance value,
The transmission system, wherein the first circuit and the second circuit are separated and independent.
JP2004128498A 2004-04-23 2004-04-23 Transmission system Expired - Fee Related JP4526297B2 (en)

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Citations (3)

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Publication number Priority date Publication date Assignee Title
JPS56114450A (en) * 1980-02-13 1981-09-09 Iwatsu Electric Co Ltd Signal transmission system
JPS57103521A (en) * 1980-12-19 1982-06-28 Iwatsu Electric Co Ltd Power supply circuit
JPH08172442A (en) * 1994-12-19 1996-07-02 Yokogawa Electric Corp Two-wire system pulse signal transmitter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56114450A (en) * 1980-02-13 1981-09-09 Iwatsu Electric Co Ltd Signal transmission system
JPS57103521A (en) * 1980-12-19 1982-06-28 Iwatsu Electric Co Ltd Power supply circuit
JPH08172442A (en) * 1994-12-19 1996-07-02 Yokogawa Electric Corp Two-wire system pulse signal transmitter

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