JP2006074738A - Deterioration diagnostic device for optical signal transmission system - Google Patents

Deterioration diagnostic device for optical signal transmission system Download PDF

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JP2006074738A
JP2006074738A JP2005203075A JP2005203075A JP2006074738A JP 2006074738 A JP2006074738 A JP 2006074738A JP 2005203075 A JP2005203075 A JP 2005203075A JP 2005203075 A JP2005203075 A JP 2005203075A JP 2006074738 A JP2006074738 A JP 2006074738A
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optical signal
transmission system
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Hideyoshi Dobashi
栄喜 土橋
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Fuji Electric Co Ltd
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Fuji Electric Systems Co Ltd
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<P>PROBLEM TO BE SOLVED: To easily detect deterioration of an optical signal transmission system for transmitting signals even while a controlled device is operated. <P>SOLUTION: There are provided a first A/D converter 21 for detecting that an output control signal of an optic/electric converter 7 provided in a controlled device 5 reaches a predetermined value when sending a control signal from a control device 1 through an optical fiber 4 to the controlled device 5; and a second A/D converter 22 for detecting that this control signal reaches a value deciding the deterioration of the optical signal transmission system. Otherwise, if the control signal sent through a downlink optical fiber 11 to the controlled device 5 is decreased to a level deciding the optical signal transmission system deterioration, an electric/optic converter 3 belonging to the controlled device 5 through a logic circuit 25 sends a signal deciding the deterioration of the optical signal transmission system through an uplink optical fiber 12 to the control device 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

この発明は、制御装置から被制御装置への制御信号，あるいはその逆方向への応答信号を光信号で伝送する際の光信号伝送システムの劣化を診断する光信号伝送システムの劣化診断装置に関する。   The present invention relates to a degradation diagnosis apparatus for an optical signal transmission system that diagnoses degradation of an optical signal transmission system when a control signal from a control apparatus to a controlled apparatus or a response signal in the opposite direction is transmitted as an optical signal.

例えば、電力変換装置を構成している半導体スイッチ素子をオン・オフ動作させる際のゲート信号を、光信号で制御装置から与えるならば、高電圧の電力変換装置であっても絶縁が容易になるし、ゲート信号にノイズが重畳する恐れも低減できるので多用されている。そこで以下では、光信号伝送システムにより、電力変換装置を構成する半導体スイッチ素子へ制御信号を送る場合を例にして、本発明の説明を行う。
図４は制御装置からの制御信号を光信号で半導体スイッチ素子への伝送を行う第１従来例を示した回路構成図である。この図４において、制御装置１を構成するスイッチング指令演算回路２からの電気信号は、複数の電気／光変換器３で別個に光信号に変換され、各光信号ごとに別個の光伝送路としての光ファイバー４を経て、被制御装置５を構成する個々のゲートアンプ６へ入力する。ゲートアンプ６に設けられている光／電気変換器７は、光ファイバー４で送られてきた光信号を電気信号に変換する。この変換された電気信号を半導体スイッチ素子８のゲートに与えることにより、当該半導体スイッチ素子８はオン・オフ動作する。 For example, if a gate signal for turning on / off a semiconductor switch element constituting a power conversion device is supplied from a control device as an optical signal, even a high voltage power conversion device can be easily insulated. However, it is often used because the possibility of noise being superimposed on the gate signal can be reduced. Therefore, in the following, the present invention will be described by taking as an example a case where a control signal is sent to a semiconductor switch element constituting a power conversion device by an optical signal transmission system.
FIG. 4 is a circuit configuration diagram showing a first conventional example in which a control signal from a control device is transmitted as an optical signal to a semiconductor switch element. In FIG. 4, an electrical signal from the switching command arithmetic circuit 2 constituting the control device 1 is converted into an optical signal separately by a plurality of electrical / optical converters 3 and is used as a separate optical transmission line for each optical signal. Are input to the individual gate amplifiers 6 constituting the controlled device 5. The optical / electrical converter 7 provided in the gate amplifier 6 converts the optical signal sent by the optical fiber 4 into an electrical signal. By applying the converted electrical signal to the gate of the semiconductor switch element 8, the semiconductor switch element 8 is turned on / off.

図５は制御装置からの制御信号を光信号で半導体スイッチ素子への伝送と、半導体スイッチ素子からの応答信号を光信号で制御装置への伝送を行う第２従来例を示した回路構成図であって、制御装置１からの制御信号を半導体スイッチ素子８へ送る下り光ファイバー１１と、その両端に電気／光変換器３と光／電気変換器７を備える共に、半導体スイッチ素子８からの応答信号を制御装置１へ送る上り光ファイバー１２と、その両端に電気／光変換器３と光／電気変換器７を備えている。このような構成により、下り光ファイバー１１が半導体スイッチ素子８にオン・オフ信号を与え、半導体スイッチ素子８の動作結果の応答信号が上り光ファイバー１２を経て制御装置１へフィードバックされている。
図６は図４または図５に図示の光／電気変換器の一般的な構成を示した回路構成図であって、光ファイバー４によって伝送されてきた光信号は、フォトダイオード１５でアナログ量の電気信号に変換されたのち、Ａ／Ｄ変換器１６でディジタル量の電気信号に変換され、これが半導体スイッチ素子８のゲートに与えられる。 FIG. 5 is a circuit configuration diagram showing a second conventional example in which a control signal from the control device is transmitted to the semiconductor switch element as an optical signal and a response signal from the semiconductor switch element is transmitted to the control device as an optical signal. In addition, the downstream optical fiber 11 for sending a control signal from the control device 1 to the semiconductor switch element 8, the electric / optical converter 3 and the optical / electric converter 7 at both ends thereof, and a response signal from the semiconductor switch element 8. Are transmitted to the control device 1, and an electric / optical converter 3 and an optical / electrical converter 7 are provided at both ends thereof. With such a configuration, the downstream optical fiber 11 gives an on / off signal to the semiconductor switch element 8, and the response signal of the operation result of the semiconductor switch element 8 is fed back to the control device 1 via the upstream optical fiber 12.
FIG. 6 is a circuit configuration diagram showing a general configuration of the optical / electrical converter shown in FIG. 4 or FIG. 5, and an optical signal transmitted through the optical fiber 4 is converted into an analog quantity of electricity by the photodiode 15. After being converted into a signal, the A / D converter 16 converts the signal into a digital electric signal, which is applied to the gate of the semiconductor switch element 8.

図７は光／電気変換器への入力と出力の関係を示したグラフであって、横軸は入力する光信号の光量を示し、縦軸は出力する電気量を示している。このグラフで明らかなように、入力光量と出力電気量とは比例の関係にある。それ故、例えば制御装置１が発する制御信号が正常値であっても、光信号伝送システムを構成している各装置のいずれかが劣化するならば、伝送される光量は減少することになる。この光量の低下の程度が甚だしければ、半導体スイッチ素子８が不安定動作あるいは不動作になる恐れがある。
そこで光信号伝送システムが劣化したことを、半導体スイッチ素子８の動作時間から検出する提案がなされている（例えば、特許文献１参照。）。あるいは光信号伝送システムの劣化を検出する装置を別個に備えることにより、光信号伝送システムが多数であっても、その劣化を効率良く検出することができる提案がなされている（例えば、特許文献２参照。）。
特開平９−２６６６６２号公報 特開平１１−３５５９０２号公報 FIG. 7 is a graph showing the relationship between input and output to the optical / electrical converter, where the horizontal axis indicates the amount of light of the input optical signal, and the vertical axis indicates the amount of electricity output. As is apparent from this graph, the input light quantity and the output electric quantity are in a proportional relationship. Therefore, for example, even if the control signal generated by the control device 1 is a normal value, if any of the devices constituting the optical signal transmission system deteriorates, the amount of light transmitted decreases. If the decrease in the amount of light is significant, the semiconductor switch element 8 may be unstable or inoperable.
Therefore, a proposal has been made to detect the deterioration of the optical signal transmission system from the operation time of the semiconductor switch element 8 (see, for example, Patent Document 1). Alternatively, it has been proposed that an apparatus for detecting deterioration of an optical signal transmission system is separately provided so that the deterioration can be efficiently detected even when there are a large number of optical signal transmission systems (for example, Patent Document 2). reference.).
JP-A-9-266661 JP 11-355902 A

例えば被制御装置が大容量の電力変換装置の場合は、多くの半導体スイッチ素子の直並列接続で構成しているから、半導体スイッチ素子の数に対応した多数の光信号伝送システムが必要になる。そこでこれらが劣化しているか否かを、手間をかけずに検出できることが望まれる。しかしながら特許文献１に記載の提案は、被制御装置５を構成している半導体スイッチ素子８の動作時間の遅れから光信号伝送システムの劣化を間接的に検出しているので、半導体スイッチ素子８自体の異常と光信号伝送システムの異常とを分離することができない不都合があるし、被制御装置５が半導体スイッチ素子８でない場合にはこの提案を適用できない不具合がある。また特許文献２に記載の提案は、被制御装置５が停止している状態で光信号伝送システムの劣化を診断するので、被制御装置５を運転しながら劣化を診断することができない不都合がある。   For example, when the controlled device is a large-capacity power conversion device, a large number of optical signal transmission systems corresponding to the number of semiconductor switch elements are required because the semiconductor switch elements are configured by series-parallel connection. Therefore, it is desirable to be able to detect whether or not these have deteriorated without much effort. However, the proposal described in Patent Document 1 indirectly detects the deterioration of the optical signal transmission system from the delay of the operation time of the semiconductor switch element 8 constituting the controlled device 5, so that the semiconductor switch element 8 itself And the optical signal transmission system cannot be separated from each other, and there is a problem that this proposal cannot be applied when the controlled device 5 is not the semiconductor switch element 8. In addition, the proposal described in Patent Document 2 has a disadvantage that the deterioration of the optical signal transmission system is diagnosed while the controlled device 5 is stopped, so that the deterioration cannot be diagnosed while the controlled device 5 is operated. .

そこでこの発明の目的は、被制御装置が運転中であっても、信号を伝送する光信号伝送システムの劣化を簡単に検出できるようにすることにある。   Accordingly, an object of the present invention is to make it possible to easily detect deterioration of an optical signal transmission system that transmits a signal even when a controlled apparatus is in operation.

前記の課題を解決するために、この発明では、制御装置が発する電気量の制御信号を、電気／光変換器と光伝送路と光／電気変換器とでなる光信号伝送システムを介して被制御装置へ送るにあたって、当該被制御装置には、前記光／電気変換器から出力される制御信号が所望の所定値に達していることを検出する制御所定値検出器と、この制御信号が前記光信号伝送システムの劣化を判定する値に達していることを検出する劣化判定値検出器と、を備える。
または、制御装置が発する電気量の制御信号を、電気／光変換器と下り光伝送路と光／電気変換器とでなる下り光信号伝送システムを介して被制御装置へ送り、被制御装置が発する電気量の制御信号を、電気／光変換器と上り光伝送路と光／電気変換器とでなる上り光信号伝送システムを介して制御装置へ送る構成の光信号伝送システムで、前記被制御装置には、当該被制御装置に属する光／電気変換器が出力する制御信号が所望の所定値に達していることを検出する制御所定値検出器と、この制御信号が前記下り光信号伝送システムの劣化を判定する値に達していることを検出する劣化判定値検出器とを備え、該劣化判定値検出器の検出信号を光信号に変換して前記上り光伝送路を介して前記制御装置へ送出する。 In order to solve the above-described problems, according to the present invention, a control signal of the amount of electricity generated by the control device is received via an optical signal transmission system including an electrical / optical converter, an optical transmission path, and an optical / electrical converter. In sending to the control device, the controlled device includes a control predetermined value detector for detecting that the control signal output from the optical / electrical converter has reached a desired predetermined value, and the control signal A deterioration determination value detector for detecting that a value for determining deterioration of the optical signal transmission system has been reached.
Alternatively, the control signal of the amount of electricity generated by the control device is sent to the controlled device via the downstream optical signal transmission system including the electrical / optical converter, the downstream optical transmission path, and the optical / electrical converter, and the controlled device An optical signal transmission system configured to send a control signal of the amount of electricity emitted to a control device via an upstream optical signal transmission system including an electrical / optical converter, an upstream optical transmission line, and an optical / electrical converter, The apparatus includes a control predetermined value detector for detecting that a control signal output from the optical / electrical converter belonging to the controlled apparatus has reached a desired predetermined value, and the control signal is transmitted to the downstream optical signal transmission system. A deterioration determination value detector that detects that a value for determining deterioration of the signal has been reached, converts the detection signal of the deterioration determination value detector into an optical signal, and transmits the detection signal through the upstream optical transmission line. To send.

または、制御装置が発する電気量の制御信号を、電気／光変換器と下り光伝送路と光／電気変換器とでなる下り光信号伝送システムを介して被制御装置へ送り、被制御装置が発する電気量の制御信号を、電気／光変換器と上り光伝送路と光／電気変換器とでなる上り光信号伝送システムを介して制御装置へ送る構成の光信号伝送システムで、前記制御装置に属する光／電気変換器が出力する制御信号が所望の所定値に達していることを検出する制御所定値検出器と、この制御信号が前記上り光信号伝送システムの劣化を判定する値に達していることを検出する劣化判定値検出器を前記制御装置に備える。
さらに、上記おいて、送出された検出信号を電気信号に変換した制御信号が所望の所定値に達していることを検出する制御所定値検出器と、この制御信号が前記上り光信号伝送システムの劣化を判定する値に達していることを検出する劣化判定値検出器を前記制御装置に備える。 Alternatively, the control signal of the amount of electricity generated by the control device is sent to the controlled device via the downstream optical signal transmission system including the electrical / optical converter, the downstream optical transmission path, and the optical / electrical converter, and the controlled device An optical signal transmission system configured to send a control signal for the amount of electricity to be transmitted to a control device via an upstream optical signal transmission system comprising an electrical / optical converter, an upstream optical transmission line, and an optical / electrical converter, wherein the control device A control predetermined value detector for detecting that a control signal output by the optical / electrical converter belonging to the signal reaches a desired predetermined value, and the control signal reaches a value for determining deterioration of the upstream optical signal transmission system. The control device is provided with a deterioration judgment value detector for detecting that the
Furthermore, in the above, a control predetermined value detector for detecting that a control signal obtained by converting the transmitted detection signal into an electric signal has reached a desired predetermined value, and this control signal is transmitted to the upstream optical signal transmission system. The control device includes a deterioration determination value detector that detects that a value for determining deterioration has been reached.

この発明によれば、光信号伝送システムを介して被制御装置に達する制御信号のレベルを常時チェックすることにより、被制御装置が運転中であっても、光信号伝送システムの劣化を検出できるから、これが原因で被制御装置の動作に異常を生じるのを未然に防止できる効果が得られる。   According to this invention, since the level of the control signal reaching the controlled device via the optical signal transmission system is constantly checked, deterioration of the optical signal transmission system can be detected even when the controlled device is in operation. As a result, it is possible to prevent the occurrence of an abnormality in the operation of the controlled device due to this.

図１は本発明の第１実施例を表した回路図であって、図４で既述の第１従来例回路に対応する。この第１実施例回路における光／電気変換器は、図６で既述の一般的な光／電気変換器とは異なって、別個の変換レベルを設定している２組のＡ／Ｄ変換器を備えている。すなわち、光ファイバー４によって伝送された光信号は、フォトダイオード１５でアナログ量の電気信号に変換された後、１号Ａ／Ｄ変換器２１と２号Ａ／Ｄ変換器２２がこのアナログ信号をディジタル量の電気信号に変換する。ここで制御所定値検出器としての１号Ａ／Ｄ変換器２１は、変換されたディジタル信号を半導体スイッチ素子８のゲートに与える際に、このディジタル信号が所定の制御信号レベルに達しているか否かを検出する。また劣化判定値検出器としての２号Ａ／Ｄ変換器２２は、変換されたディジタル信号が光信号伝送システムの劣化を判定するレベルに達しているか否かを検出するのであるが、劣化判定レベルを制御信号レベルよりも高く設定する。   FIG. 1 is a circuit diagram showing a first embodiment of the present invention, and corresponds to the circuit of the first conventional example already described in FIG. The optical / electrical converter in the circuit of the first embodiment is different from the general optical / electrical converter described above with reference to FIG. 6, and two sets of A / D converters in which separate conversion levels are set. It has. That is, the optical signal transmitted by the optical fiber 4 is converted into an electrical signal of an analog quantity by the photodiode 15, and then the No. 1 A / D converter 21 and the No. 2 A / D converter 22 convert the analog signal into a digital signal. Convert to electrical signal of quantity. Here, the No. 1 A / D converter 21 serving as the control predetermined value detector applies the converted digital signal to the gate of the semiconductor switch element 8 to determine whether or not the digital signal has reached a predetermined control signal level. To detect. The No. 2 A / D converter 22 as a deterioration determination value detector detects whether or not the converted digital signal has reached a level for determining deterioration of the optical signal transmission system. Is set higher than the control signal level.

図２は図１で既述の第１実施例回路の動作を説明する動作説明図であって、図２(a) は光信号伝送システムが正常な場合を、図２(b) は光信号伝送システムが劣化している場合を表しているが、それぞれは、上段が光量を表し、下段は電気量を表している。すなわち、光信号伝送システムが正常ならば十分な光量が伝送されているから、変換された電気量は劣化判定レベルを越えており（図２(a) 参照）、光信号伝送システムは正常と判定できる。しかし光信号伝送システムが劣化して、伝送される光量が減少すれば、これに比例して電気量も減少する。よってこの電気量が劣化判定レベルを下回ったとき（図２(b) 参照）、光信号伝送システムは劣化したと判定する。しかしこのときも半導体スイッチ素子８へは所定の制御信号レベルは上回った電気量が与えられているから、当該半導体スイッチ素子８の動作に異常を生じる恐れは無い。   2 is an operation explanatory diagram for explaining the operation of the circuit of the first embodiment described above with reference to FIG. 1. FIG. 2 (a) shows a case where the optical signal transmission system is normal, and FIG. 2 (b) shows an optical signal. Although the case where the transmission system has deteriorated is shown, in each case, the upper part represents the amount of light and the lower part represents the amount of electricity. That is, if the optical signal transmission system is normal, a sufficient amount of light is transmitted, so the converted amount of electricity exceeds the deterioration determination level (see FIG. 2 (a)), and the optical signal transmission system is determined to be normal. it can. However, if the optical signal transmission system deteriorates and the amount of transmitted light decreases, the amount of electricity also decreases proportionally. Therefore, when the amount of electricity falls below the deterioration determination level (see FIG. 2B), it is determined that the optical signal transmission system has deteriorated. However, even at this time, the semiconductor switch element 8 is supplied with an amount of electricity that exceeds a predetermined control signal level, and therefore there is no possibility of causing an abnormality in the operation of the semiconductor switch element 8.

図３は本発明の第２実施例を表した回路図であって、図５で既述の第２従来例回路に対応するのであるが、この第２実施例回路における光／電気変換器の構成は、図１で既述の第１実施例回路の場合と同じである。この第２実施例回路では、更に前記２号Ａ／Ｄ変換器２２の出力信号を処理する論理回路２３と、これの論理演算結果を光信号に変換する装置が付加されている。なお、図のフィードバック信号は、半導体スイッチ素子８のオン・オフ動作結果の応答信号であり、このフィードバック信号が上り光ファイバー１２を介して制御装置１へフィードバックされると、制御装置１では制御信号（制御装置１からゲートアンプ６へ送出されたゲート信号）とフィードバック信号との比較を行い、両信号が一致しなければ半導体スイッチ素子あるいは電力変換装置の異常と判断する。
このような構成において、下り光ファイバー１１からの光信号が減少したことを、２号Ａ／Ｄ変換器２２が検出すると、反転素子２４と論理和素子２５でなる論理回路２３の出力信号が反転する。この論理演算結果はスイッチ素子３１とフォトダイオード３２で光信号に変換され、上り光ファイバー１２を介して制御装置１へ送出されるから、制御装置１は光信号伝送システムの劣化を知ることができ、光信号伝送システムの劣化診断の結果を、警報や装置異常停止などの装置状態制御に利用することが可能になる。 FIG. 3 is a circuit diagram showing a second embodiment of the present invention, which corresponds to the circuit of the second conventional example already described with reference to FIG. 5. The optical / electrical converter in the circuit of the second embodiment is shown in FIG. The configuration is the same as that of the first embodiment circuit already described in FIG. In the circuit of the second embodiment, a logic circuit 23 for processing the output signal of the No. 2 A / D converter 22 and a device for converting the logical operation result thereof into an optical signal are further added. The feedback signal in the figure is a response signal as a result of the on / off operation of the semiconductor switch element 8. When this feedback signal is fed back to the control device 1 via the upstream optical fiber 12, the control device 1 The gate signal transmitted from the control device 1 to the gate amplifier 6 is compared with the feedback signal, and if the two signals do not match, it is determined that the semiconductor switch element or the power converter is abnormal.
In such a configuration, when the No. 2 A / D converter 22 detects that the optical signal from the downstream optical fiber 11 has decreased, the output signal of the logic circuit 23 composed of the inverting element 24 and the OR element 25 is inverted. . Since this logical operation result is converted into an optical signal by the switch element 31 and the photodiode 32 and sent to the control device 1 via the upstream optical fiber 12, the control device 1 can know the deterioration of the optical signal transmission system, The result of the degradation diagnosis of the optical signal transmission system can be used for device status control such as an alarm or an abnormal stop of the device.

なお、この第２実施例においても、劣化判定レベルは制御信号レベルよりも高くしておく。また図示していないが、制御装置１の光／電気変換器７にも、１号Ａ／Ｄ変換器２１および２号Ａ／Ｄ変換器２２を備えることにより、上り光信号システムの劣化を検出することができる。
図８は本発明の第３実施例を表した回路図であって、光信号伝送システムの劣化診断装置を備えた制御装置からの制御信号を光信号で半導体スイッチ素子への伝送と、半導体スイッチ素子からの応答信号を光信号で制御装置への伝送を行う回路構成図である。この図８では、第１，２実施例と同一符号を付したものは同一機能を有する。
図において、被制御装置５は、光／電気変換器７と、電気／光変換器３と、制御所定値検出器としての１号Ａ／Ｄ変換器２１と、劣化判定値検出器としての２号Ａ／Ｄ変換器２２と、反転素子２４と、論理和素子２５と、制御対象としての半導体スイッチ素子８とから構成されており、これらの各動作については第２実施例と同様であるので、ここでの説明は省略する。 In this second embodiment as well, the deterioration determination level is set higher than the control signal level. Although not shown, the optical / electrical converter 7 of the control device 1 also includes a No. 1 A / D converter 21 and a No. 2 A / D converter 22 to detect deterioration of the upstream optical signal system. can do.
FIG. 8 is a circuit diagram showing a third embodiment of the present invention, in which a control signal from a control device equipped with a degradation diagnosis device for an optical signal transmission system is transmitted as an optical signal to a semiconductor switch element, and a semiconductor switch It is a circuit block diagram which transmits the response signal from an element to a control apparatus with an optical signal. In FIG. 8, the same reference numerals as those in the first and second embodiments have the same functions.
In the figure, a controlled device 5 includes an optical / electrical converter 7, an electrical / optical converter 3, a No. 1 A / D converter 21 as a control predetermined value detector, and 2 as a deterioration determination value detector. The A / D converter 22, the inverting element 24, the OR element 25, and the semiconductor switch element 8 to be controlled are the same as those in the second embodiment. Explanation here is omitted.

一方、制御装置１は、電気／光変換器３と、光／電気変換器７と、制御所定値検出器としての３号Ａ／Ｄ変換器８１と、劣化判定値検出器としての４号Ａ／Ｄ変換器８２と、スイッチング指令演算器８０とから構成されている。ここで、３号Ａ／Ｄ変換器８１は、変換されたディジタル信号が所定の制御信号レベルに達しているか否かを検出するものであり、また４号Ａ／Ｄ変換器８２は、変換されたディジタル信号が光信号伝送システムの劣化を判定するレベルに達しているか否かを検出するものであるが、劣化判定レベルを制御信号レベルよりも高く設定している。また、スイッチング指令演算器８０は、比較器８３を備えており、この比較器８３は、制御信号とフィードバック信号との比較を行い、両信号が一致しなければ半導体スイッチ素子あるいは電力変換装置の異常と判断する。
このような構成において、スイッチング指令演算器８０で演算された制御信号は、電気／光変換器３で光信号に変換され、下り光ファイバー１１を経由して被制御装置５を構成するゲートアンプへ入力する。被制御装置５に属する光／電気変換器７は、下り光ファイバー１１で送られてきた光信号を電気信号に変換し、この信号に基づいて半導体スイッチ素子８がオン・オフ制御される。ここで、半導体素子８の動作状態の応答信号であるフィードバック信号は、論理和素子２５を介して被制御装置５に属する電気／光変換器３で光信号に変換され、上り光ファイバー１２を経由して制御装置１に属する光／電気変換器７で光信号を電気信号に変換する。このフィードバック信号は、比較器８３により制御信号と比較され、両信号が一致していれば半導体スイッチ素子および電力変換装置が正常であると判断し、逆に両信号が一致しなければ半導体スイッチ素子あるいは電力変換装置の異常と判断する。 On the other hand, the control device 1 includes an electrical / optical converter 3, an optical / electrical converter 7, a No. 3 A / D converter 81 as a control predetermined value detector, and a No. 4A as a deterioration determination value detector. A / D converter 82 and a switching command calculator 80 are included. Here, the No. 3 A / D converter 81 detects whether or not the converted digital signal has reached a predetermined control signal level, and the No. 4 A / D converter 82 is converted. The digital signal is detected whether or not it has reached the level for judging the deterioration of the optical signal transmission system, but the deterioration judgment level is set higher than the control signal level. The switching command calculator 80 includes a comparator 83. The comparator 83 compares the control signal and the feedback signal, and if the two signals do not match, an abnormality of the semiconductor switch element or the power conversion device is detected. Judge.
In such a configuration, the control signal calculated by the switching command calculator 80 is converted into an optical signal by the electrical / optical converter 3 and input to the gate amplifier constituting the controlled device 5 via the downstream optical fiber 11. To do. The optical / electrical converter 7 belonging to the controlled device 5 converts the optical signal sent from the downstream optical fiber 11 into an electrical signal, and the semiconductor switch element 8 is on / off controlled based on this signal. Here, a feedback signal which is a response signal of the operating state of the semiconductor element 8 is converted into an optical signal by the electric / optical converter 3 belonging to the controlled device 5 via the OR element 25 and passes through the upstream optical fiber 12. Thus, the optical signal is converted into an electrical signal by the optical / electrical converter 7 belonging to the control device 1. The feedback signal is compared with the control signal by the comparator 83, and if both signals match, it is determined that the semiconductor switch element and the power conversion device are normal. Conversely, if both signals do not match, the semiconductor switch element Alternatively, it is determined that the power converter is abnormal.

一方、劣化判定値検出器としての２号Ａ／Ｄ変換器２２は、変換されたディジタル信号が光信号伝送システムの劣化を判定するレベルに達しているか否かを検出し、電気量が劣化判定レベルを上回っていれば光信号伝送システムは正常と判断し、電気量が劣化判定レベルを下回ったとき（図２（ｂ）参照）、光信号伝送システムは劣化したと判定する。判定の結果、下り光ファイバー１１からの光信号が減少したことを２号Ａ／Ｄ変換器２２が検出すると、反転素子２４と論理和素子２５でなる論理回路２３の出力信号が反転し、この論理演算結果は電気／光変換器３で光信号に変換され、上り光ファイバー１２を介して制御装置１へ送出される。この例では、光信号伝送システムの劣化検出時に電気／光変換装置３がフィードバック信号を遮断して連続発光するものであり、この信号が３号Ａ／Ｄ変換器８１を介してスイッチング指令演算器８０に入力されると下り伝送路の異常と判断する。このような構成によれば、制御所定値検出器としての３号Ａ／Ｄ変換器８１を、制御対象の異常監視と下り伝送路の異常監視とに兼用することができる。なお、本実施例では、反転素子２４と論理和素子２５とからなる論理回路でフィードバック信号と下り伝送路異常信号とを出力するよう構成しているが、この構成に限るものではなく、フィードバック信号と下り伝送路異常信号とが異なる出力となる回路であればよい。   On the other hand, No. 2 A / D converter 22 as a deterioration determination value detector detects whether or not the converted digital signal has reached a level for determining deterioration of the optical signal transmission system, and the amount of electricity is determined to deteriorate. If it exceeds the level, it is determined that the optical signal transmission system is normal, and if the amount of electricity falls below the deterioration determination level (see FIG. 2B), it is determined that the optical signal transmission system has deteriorated. As a result of the determination, when the No. 2 A / D converter 22 detects that the optical signal from the downstream optical fiber 11 has decreased, the output signal of the logic circuit 23 composed of the inverting element 24 and the OR element 25 is inverted. The calculation result is converted into an optical signal by the electrical / optical converter 3 and sent to the control device 1 via the upstream optical fiber 12. In this example, when the deterioration of the optical signal transmission system is detected, the electrical / optical conversion device 3 cuts off the feedback signal and continuously emits light, and this signal is passed through the No. 3 A / D converter 81 and the switching command calculator. If it is input to 80, it is determined that the downlink transmission line is abnormal. According to such a configuration, the No. 3 A / D converter 81 as the control predetermined value detector can be used both for monitoring an abnormality to be controlled and monitoring an abnormality of the downlink transmission line. In this embodiment, the feedback circuit and the downstream transmission line abnormality signal are output by the logic circuit including the inverting element 24 and the OR element 25. However, the present invention is not limited to this configuration. As long as the output signal is different from the downlink transmission line abnormality signal.

また、劣化判定値検出器としての４号Ａ／Ｄ変換器８２は、変換されたディジタル信号が光信号伝送システムの劣化を判定するレベルに達しているか否かを検出し、電気量が劣化判定レベルを上回っていれば光信号伝送システムは正常と判断し、電気量が劣化判定レベルを下回ったとき（図２（ｂ）参照）、光信号伝送システムは劣化したと判定する。フィードバック信号が論理和素子２４を介して被制御装置５に属する電気／光変換器３で光信号に変換され、上り光ファイバー１２を経由して制御装置１に属する光／電気変換器７で光信号を電気信号に変換するが、上り光ファイバー１２からの光信号が減少したことを４号Ａ／Ｄ変換器２２が検出すると、その信号がスイッチング指令演算器８０に送られ上り伝送路の異常と判断する。
なお、上り伝送路あるいは下り伝送路が劣化したと判定されても、半導体スイッチ素子８へは所定の制御信号レベルは上回った電気量が与えられているから、当該半導体スイッチ素子８の動作に異常を生じる恐れは無い。 The No. 4 A / D converter 82 as a deterioration determination value detector detects whether or not the converted digital signal has reached a level for determining deterioration of the optical signal transmission system, and the amount of electricity is determined to deteriorate. If it exceeds the level, it is determined that the optical signal transmission system is normal, and if the amount of electricity falls below the deterioration determination level (see FIG. 2B), it is determined that the optical signal transmission system has deteriorated. The feedback signal is converted into an optical signal by the electrical / optical converter 3 belonging to the controlled device 5 via the OR element 24, and is transmitted by the optical / electrical converter 7 belonging to the control device 1 via the upstream optical fiber 12. When the No. 4 A / D converter 22 detects that the optical signal from the upstream optical fiber 12 has decreased, the signal is sent to the switching command calculator 80 to determine that the upstream transmission line is abnormal. To do.
Even if it is determined that the upstream transmission path or the downstream transmission path has deteriorated, the semiconductor switch element 8 is given an amount of electricity exceeding a predetermined control signal level, so that the operation of the semiconductor switch element 8 is abnormal. There is no fear of producing.

本発明の第１実施例を表した回路図1 is a circuit diagram showing a first embodiment of the present invention. 図１で既述の第１実施例回路の動作を説明する動作説明図Operation explanatory diagram for explaining the operation of the circuit of the first embodiment already described in FIG. 本発明の第２実施例を表した回路図Circuit diagram showing the second embodiment of the present invention 制御装置からの制御信号を光信号で半導体スイッチ素子への伝送を行う第１従来例を示した回路構成図1 is a circuit configuration diagram showing a first conventional example in which a control signal from a control device is transmitted as an optical signal to a semiconductor switch element. 制御装置からの制御信号を光信号で半導体スイッチ素子への伝送と、半導体スイッチ素子からの応答信号を光信号で制御装置への伝送を行う第２従来例を示した回路構成図A circuit configuration diagram showing a second conventional example in which a control signal from a control device is transmitted as an optical signal to the semiconductor switch element, and a response signal from the semiconductor switch element is transmitted as an optical signal to the control device. 図４または図５に図示の光／電気変換器の一般的な構成を示した回路構成図4 is a circuit diagram showing a general configuration of the optical / electrical converter shown in FIG. 光／電気変換器への入力と出力の関係を示したグラフGraph showing the relationship between input to optical / electrical converter and output 本発明の第３実施例を表した回路図Circuit diagram showing the third embodiment of the present invention

符号の説明Explanation of symbols

１ 制御装置
３ 電気／光変換器
４ 光ファイバー
５ 被制御装置
７ 光／電気変換器
８ 半導体スイッチ素子
１１ 下り光ファイバー
１２ 上り光ファイバー
１５，３２ フォトダイオード
１６ Ａ／Ｄ変換器
２１，８２ １号Ａ／Ｄ変換器
２２，８３ ２号Ａ／Ｄ変換器
２３ 論理回路
２４ 反転素子
２５ 論理和素子
３１ スイッチ素子 DESCRIPTION OF SYMBOLS 1 Control apparatus 3 Electrical / optical converter 4 Optical fiber 5 Controlled apparatus 7 Optical / electrical converter 8 Semiconductor switch element 11 Downstream optical fiber 12 Upstream optical fiber 15,32 Photodiode 16 A / D converter 21,82 No. 1 A / D Converter 22, 83 No. 2 A / D converter 23 Logic circuit 24 Inverting element 25 OR element 31 Switch element

Claims (4)

制御装置が発する電気量の制御信号を光信号に変換する電気／光変換器と、この光信号を被制御装置へ伝送する光伝送路と、該被制御装置が受信した前記光信号をその光量に対応した電気量の制御信号に変換する光／電気変換器と、を備えている光信号伝送システムにおいて、
前記光／電気変換器が出力する制御信号が所望の所定値に達していることを検出する制御所定値検出器と、この制御信号が前記光信号伝送システムの劣化を判定する値に達していることを検出する劣化判定値検出器を前記被制御装置に備えることを特徴とする光信号伝送システムの劣化診断装置。 An electrical / optical converter that converts a control signal of the amount of electricity generated by the control device into an optical signal, an optical transmission line that transmits the optical signal to the controlled device, and the light amount of the optical signal received by the controlled device In an optical signal transmission system comprising an optical / electrical converter that converts an electrical quantity control signal corresponding to
A control predetermined value detector for detecting that a control signal output from the optical / electrical converter has reached a desired predetermined value, and this control signal has reached a value for determining deterioration of the optical signal transmission system. A deterioration diagnosis apparatus for an optical signal transmission system, comprising: a deterioration determination value detector for detecting this in the controlled apparatus. 制御装置が発する電気量の制御信号を光信号に変換する電気／光変換器と、この光信号を被制御装置へ伝送する下り光伝送路と、該被制御装置が受信した前記光信号をその光量に対応した電気量の制御信号に変換する光／電気変換器とを備えた下り光信号伝送システムと、前記被制御装置が発する電気量の応答信号を光信号に変換する電気／光変換器と、この光信号を前記制御装置へ伝送する上り光伝送路と、該制御装置が受信した前記光信号をその光量に対応した電気量の応答信号に変換する光／電気変換器とを備えた上り光信号伝送システムと、で構成している光信号伝送システムにおいて、
前記被制御装置に属する光／電気変換器が出力する制御信号が所望の所定値に達していることを検出する制御所定値検出器と、この制御信号が前記下り光信号伝送システムの劣化を判定する値に達していることを検出する劣化判定値検出器を前記被制御装置に備え、該劣化判定値検出器の検出信号を光信号に変換して前記上り光伝送路を介して前記制御装置へ送出することを特徴とする光信号伝送システムの劣化診断装置。 An electrical / optical converter that converts a control signal of the amount of electricity generated by the control device into an optical signal, a downstream optical transmission line that transmits the optical signal to the controlled device, and the optical signal received by the controlled device A downstream optical signal transmission system including an optical / electrical converter that converts an electrical quantity control signal corresponding to the amount of light, and an electrical / optical converter that converts an electrical quantity response signal generated by the controlled device into an optical signal And an upstream optical transmission line that transmits the optical signal to the control device, and an optical / electrical converter that converts the optical signal received by the control device into a response signal having an electrical quantity corresponding to the light quantity. In an optical signal transmission system configured with an upstream optical signal transmission system,
A control predetermined value detector that detects that a control signal output from the optical / electrical converter belonging to the controlled device has reached a desired predetermined value, and this control signal determines deterioration of the downstream optical signal transmission system A deterioration determination value detector for detecting that the value to be reached is included in the controlled device, and a detection signal of the deterioration determination value detector is converted into an optical signal, and the control device is connected via the upstream optical transmission line. A deterioration diagnosis apparatus for an optical signal transmission system, wherein 制御装置が発する電気量の制御信号を光信号に変換する電気／光変換器と、この光信号を被制御装置へ伝送する下り光伝送路と、該被制御装置が受信した前記光信号をその光量に対応した電気量の制御信号に変換する光／電気変換器とを備えた下り光信号伝送システムと、前記被制御装置が発する電気量の応答信号を光信号に変換する電気／光変換器と、この光信号を前記制御装置へ伝送する上り光伝送路と、該制御装置が受信した前記光信号をその光量に対応した電気量の応答信号に変換する光／電気変換器とを備えた上り光信号伝送システムと、で構成している光信号伝送システムにおいて、
前記制御装置に属する光／電気変換器が出力する制御信号が所望の所定値に達していることを検出する制御所定値検出器と、この制御信号が前記上り光信号伝送システムの劣化を判定する値に達していることを検出する劣化判定値検出器を前記制御装置に備えることを特徴とする光信号伝送システムの劣化診断装置。 An electrical / optical converter that converts a control signal of the amount of electricity generated by the control device into an optical signal, a downstream optical transmission line that transmits the optical signal to the controlled device, and the optical signal received by the controlled device A downstream optical signal transmission system including an optical / electrical converter that converts an electrical quantity control signal corresponding to the amount of light, and an electrical / optical converter that converts an electrical quantity response signal generated by the controlled device into an optical signal And an upstream optical transmission line that transmits the optical signal to the control device, and an optical / electrical converter that converts the optical signal received by the control device into a response signal having an electrical quantity corresponding to the light quantity. In an optical signal transmission system configured with an upstream optical signal transmission system,
A control predetermined value detector for detecting that a control signal output from the optical / electrical converter belonging to the control device has reached a desired predetermined value, and this control signal determines deterioration of the upstream optical signal transmission system A deterioration diagnosis device for an optical signal transmission system, comprising: a deterioration determination value detector for detecting that the value has been reached in the control device. 請求項１乃至請求項３のいずれかに記載の光信号伝送システムの劣化診断装置において、
前記劣化判定値検出器の劣化を判定する値は制御所定値検出器の所定値よりも高い値とすることを特徴とする光信号伝送システムの劣化診断装置。 In the degradation diagnosis apparatus of the optical signal transmission system according to any one of claims 1 to 3,
A deterioration diagnosis apparatus for an optical signal transmission system, wherein a value for determining deterioration of the deterioration determination value detector is set to a value higher than a predetermined value of a control predetermined value detector.
JP2005203075A 2004-08-02 2005-07-12 Deterioration diagnostic device for optical signal transmission system Withdrawn JP2006074738A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01245725A (en) * 1988-03-28 1989-09-29 Hitachi Cable Ltd Optical reception circuit
JPH04242116A (en) * 1991-01-17 1992-08-28 Nec Corp Light receiving appapratus
JPH098277A (en) * 1995-06-14 1997-01-10 Tokyo Electric Power Co Inc:The Deterioration detector for light emitting element of optical thyristor
JPH09135209A (en) * 1995-11-07 1997-05-20 Nissin Electric Co Ltd Optical transmitter and optical transmission system
JPH09266662A (en) * 1996-03-28 1997-10-07 Hitachi Ltd Photothyristor ignition device
JPH11284572A (en) * 1998-03-30 1999-10-15 Nec Corp Optical signal input cut off detecting device and optical signal input cut off detecting method
JPH11355902A (en) * 1998-06-04 1999-12-24 Toshiba Transport Eng Inc Electric car controlling device, and method and device for diagnosing deterioration of electricity-to-light converting device contained therein

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01245725A (en) * 1988-03-28 1989-09-29 Hitachi Cable Ltd Optical reception circuit
JPH04242116A (en) * 1991-01-17 1992-08-28 Nec Corp Light receiving appapratus
JPH098277A (en) * 1995-06-14 1997-01-10 Tokyo Electric Power Co Inc:The Deterioration detector for light emitting element of optical thyristor
JPH09135209A (en) * 1995-11-07 1997-05-20 Nissin Electric Co Ltd Optical transmitter and optical transmission system
JPH09266662A (en) * 1996-03-28 1997-10-07 Hitachi Ltd Photothyristor ignition device
JPH11284572A (en) * 1998-03-30 1999-10-15 Nec Corp Optical signal input cut off detecting device and optical signal input cut off detecting method
JPH11355902A (en) * 1998-06-04 1999-12-24 Toshiba Transport Eng Inc Electric car controlling device, and method and device for diagnosing deterioration of electricity-to-light converting device contained therein

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