JP4366883B2 - Point-extinguishing monitoring device and power conversion device - Google Patents

Point-extinguishing monitoring device and power conversion device Download PDF

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JP4366883B2
JP4366883B2 JP2001133707A JP2001133707A JP4366883B2 JP 4366883 B2 JP4366883 B2 JP 4366883B2 JP 2001133707 A JP2001133707 A JP 2001133707A JP 2001133707 A JP2001133707 A JP 2001133707A JP 4366883 B2 JP4366883 B2 JP 4366883B2
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failure detection
return signal
switching device
light emitting
emitting element
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JP2002330592A (en
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知実 金子
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Fuji Electric Co Ltd
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Fuji Electric Systems Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、光信号によりオン・オフ制御されるスイッチングデバイスの動作を監視する点消弧監視装置及びそれを備えた電力変換装置に係り、特に電力変換装置が長時間運転を停止する場合に好適な点消弧監視装置及びそれを備えた電力変換装置に関する。
【０００２】
【従来の技術】
光信号によりオン・オフ制御されるスイッチングデバイスを用いた電力変換装置では、光信号を発生する発光素子の故障や光信号を伝送する光伝送路の断線等による事故を防止するため、スイッチングデバイスの動作を監視する点消弧監視装置が設けられる。
【０００３】
図３は、従来の電力変換装置のブロック図である。点消弧監視装置は、電力変換装置の制御装置側に設けられた制御装置側監視装置１０ｃと、スイッチングデバイス３０側に設けられたデバイス側監視装置１０ｂとから構成される。制御装置側監視装置１０ｃは、スイッチングデバイス３０をオン・オフ制御する指令信号を発生する指令信号用ＬＥＤ（発光ダイオード）１３、指令信号用ＬＥＤ１３を駆動するＬＥＤ駆動回路１２、デバイス側監視装置１０ｂからの返送信号を監視して故障を検出する故障検出回路１６、及びこれらを制御するＣＰＵ１１を備える。デバイス側監視装置１０ｂは、返送信号を発生する返送信号用ＬＥＤ１５、及び返送信号用ＬＥＤ１５を駆動するＬＥＤ駆動回路１４を備える。
【０００４】
電力変換装置の運転時、制御装置側監視装置１０ｃのＬＥＤ駆動回路１２はＣＰＵ１１の制御により指令信号用ＬＥＤ１３を駆動し、指令信号用ＬＥＤ１３はスイッチングデバイス３０をオン状態に制御する時に発光するとともにオフ状態に制御する時に消光してスイッチングデバイス３０に対する指令信号を発生する。指令信号用ＬＥＤ１３からの指令信号は、指令信号用光ファイバ２０を通ってスイッチングデバイス３０へ伝送される。スイッチングデバイス３０は、指令信号に従ってオン状態又はオフ状態に制御される。デバイス側監視装置１０ｂのＬＥＤ駆動回路１４は、スイッチングデバイス３０がオン状態にある時は返送信号用ＬＥＤ１５を消光させ、スイッチングデバイス３０がオフ状態にある時は返送信号用ＬＥＤ１５を発光させて返送信号を発生させる。
【０００５】
返送信号用ＬＥＤ１５からの出力光は、スイッチングデバイス３０のオフ状態に対応する返送信号として、返送信号用光ファイバ４０を通って制御装置側監視装置１０ｃの故障検出回路１６へ伝送される。故障検出回路１６は、ＣＰＵ１１の制御により、返送信号を監視し、制御装置側監視装置１０ｃからスイッチングデバイス３０をオン状態に制御する指令信号を発生した時は返送信号用ＬＥＤ１５からの出力光が検出されないことで正常と認識し、スイッチングデバイス３０をオフ状態に制御する指令信号を発生した時は返送信号用ＬＥＤ１５からの出力光が検出されることで正常と認識する。
【０００６】
図４は、従来の電力変換装置の動作を説明するタイミングチャートである。指令信号用ＬＥＤの発光時は返送信号用ＬＥＤが消光し、指令信号用ＬＥＤの消光時は返送信号用ＬＥＤが発光する。なお、電力変換装置では、通常、運転時はスイッチングデバイスが非常に短い時間間隔で点弧・消弧を交互に行ってオン状態・オフ状態を交互に繰り返すように制御されるものであり、これに対応して、指令信号用ＬＥＤおよび返送信号用ＬＥＤも時間的に非常に小刻みに発光・消光を繰り返す。一方、運転停止中は、スイッチングデバイスが常にオフ状態にあるように制御される。
【０００７】
【発明が解決しようとする課題】
従来の点消弧監視装置は、フェイルセイフの観点から、スイッチングデバイスがオン状態にある時は返送信号用ＬＥＤを発光させず、スイッチングデバイスがオフ状態にある時は常に返送信号用ＬＥＤを発光させていた。従って、電力変換装置の運転停止中は、常にスイッチングデバイスがオフ状態にあることから、常に返送信号用ＬＥＤが発光した状態となる。これにより、運転停止中に指令信号用ＬＥＤ又は返送信号用ＬＥＤの故障や、指令信号用光ファイバ又は返送信号用光ファイバの断線等が発生しても、運転再開前に故障を検出して事故を未然に防止することができる。
【０００８】
しかしながら、夜間の運転停止や、電気料金の安い夜間に運転して昼間は運転を停止するなど、電力変換装置が長時間運転を停止している間も、常に返送信号用ＬＥＤを発光させているため、返送信号用ＬＥＤの方が指令信号用ＬＥＤに比べてその発光素子としての寿命がより早く低下するという問題があった。
【０００９】
一般に発光素子としては発光ダイオードが使用されるが、発光ダイオードの寿命は使用時間や温度等で変化するため、定期的に光量を検査して光量が低下してきたら交換しなければならない。このため、装置の保守の面から、返送信号用の発光ダイオードの寿命を指令信号用の発光ダイオードの寿命と同程度にすることが望まれる。
【００１０】
本発明は、返送信号を発生する発光素子の寿命低下を防止することを目的とする。
【００１１】
【課題を解決するための手段】
本発明に係る点消弧監視装置は、光信号によりオン・オフ制御されるスイッチングデバイスをオン状態に制御する時に発光するとともにスイッチングデバイスをオフ状態に制御する時に消光してスイッチングデバイスに対する指令信号を発生する指令信号用発光素子と、スイッチングデバイスがオン状態にある時に消光するとともにスイッチングデバイスがオフ状態にある時に発光して返送信号を発生する返送信号用発光素子と、返送信号用発光素子が発生した返送信号を監視して故障を検出する故障検出手段と、故障検出手段の動作を無効とする故障検出制御手段と、返送信号用発光素子を消光させる消光制御手段とを備え、スイッチングデバイスを有する電力変換装置が一定時間以上運転を停止するとき、故障検出制御手段が故障検出手段の動作を無効とした後、消光制御手段が返送信号用発光素子を消光させるものである。電力変換装置が長時間運転を停止するとき、返送信号用発光素子は、消光制御手段により消光され寿命が低下しない。このとき、故障検出制御手段が故障検出手段の動作を無効とするので、点消弧監視装置は返送信号が検出されなくても故障と判断しない。
【００１２】
また、本発明に係る点消弧監視装置は、光信号によりオン・オフ制御されるスイッチングデバイスを有する電力変換装置が一定時間以上運転を停止した後運転を再開する前に、消光制御手段が返送信号用発光素子の消光を解除し、故障検出制御手段が故障検出手段の動作の無効を解除して、故障検出手段が故障検出を行うものである。これにより、電力変換装置が長時間運転を停止していた間に発光素子の故障や光伝送路の断線等が発生しても、運転再開前に故障を検出して事故を未然に防止する。
【００１３】
本発明に係る電力変換装置は、光信号によりオン・オフ制御されるスイッチングデバイスを備えた電力変換装置に、上述の点消弧監視装置を設けたものである。
【００１４】
【発明の実施の形態】
以下、本発明の実施の形態を添付図面に従って説明する。図１は、本発明の一実施の形態による電力変換装置のブロック図である。本実施の形態の点消弧監視装置は、電力変換装置の制御装置側に設けられた制御装置側監視装置１０ａと、スイッチングデバイス３０側に設けられたデバイス側監視装置１０ｂとから構成される。制御装置側監視装置１０ａは、スイッチングデバイス３０をオン・オフ制御する指令信号を発生する指令信号用ＬＥＤ（発光ダイオード）１３、指令信号用ＬＥＤ１３を駆動するＬＥＤ駆動回路１２、デバイス側監視装置１０ｂからの返送信号を監視して故障を検出する故障検出回路１６、故障検出回路１６の動作を無効とする故障検出制御回路１８、デバイス側監視装置１０ｂの返送信号用ＬＥＤ１５を消光させるＬＥＤ消光制御回路１７、及びこれらを制御するＣＰＵ１１を備える。デバイス側監視装置１０ｂは、返送信号を発生する返送信号用ＬＥＤ１５、及び返送信号用ＬＥＤ１５を駆動するＬＥＤ駆動回路１４を備える。
【００１５】
電力変換装置の運転時、制御装置側監視装置１０ａのＬＥＤ駆動回路１２はＣＰＵ１１の制御により指令信号用ＬＥＤ１３を駆動し、指令信号用ＬＥＤ１３はスイッチングデバイス３０をオン状態に制御する時に発光するとともにオフ状態に制御する時に消光してスイッチングデバイス３０に対する指令信号を発生する。指令信号用ＬＥＤ１３からの指令信号は、指令信号用光ファイバ２０を通ってスイッチングデバイス３０へ伝送される。スイッチングデバイス３０は、指令信号に従ってオン状態又はオフ状態に制御される。デバイス側監視装置１０ｂのＬＥＤ駆動回路１４は、スイッチングデバイス３０がオン状態にある時は返送信号用ＬＥＤ１５を消光させ、スイッチングデバイス３０がオフ状態にある時は返送信号用ＬＥＤ１５を発光させて返送信号を発生させる。
【００１６】
返送信号用ＬＥＤ１５からの出力光は、スイッチングデバイス３０のオフ状態に対応する返送信号として、返送信号用光ファイバ４０を通って制御装置側監視装置１０ａの故障検出回路１６へ伝送される。故障検出回路１６は、故障検出制御回路１８を介してＣＰＵ１１の制御により、返送信号を監視し、制御装置側監視装置１０ａからスイッチングデバイス３０をオン状態に制御する指令信号を発生した時は返送信号用ＬＥＤ１５からの出力光が検出されないことで正常と認識し、スイッチングデバイス３０をオフ状態に制御する指令信号を発生した時は返送信号用ＬＥＤ１５からの出力光が検出されることで正常と認識する。
【００１７】
次に、電力変換装置が一定時間以上運転を停止し、その後運転を再開するときの動作について説明する。図２は、本発明の一実施の形態による電力変換装置の動作を説明するタイミングチャートである。
【００１８】
電力変換装置が一定時間以上運転を停止するとき、制御装置側監視装置１０ａの故障検出制御回路１８は、ＣＰＵ１１の制御により、故障検出回路１６の動作を無効とする故障検出マスク信号を故障検出回路１６へ出力する（図２（ｃ））。これにより、故障検出回路１６は、故障検出を行わない。続いて、ＬＥＤ消光制御回路１７は、ＣＰＵ１１の制御により、返送信号用ＬＥＤ１５を消光させるＬＥＤ消光信号をＬＥＤ駆動回路１４へ出力する（図２（ｄ））。これによりＬＥＤ駆動回路１４は、返送信号用ＬＥＤ１５を消光させる（図２（ｅ））。
【００１９】
電力変換装置が運転を再開するとき、ＬＥＤ消光制御回路１７は、ＣＰＵ１１の制御により、ＬＥＤ消光信号の出力を停止して、返送信号用ＬＥＤ１５の消光を解除する（図２（ｄ））。これによりＬＥＤ駆動回路１４は、返送信号用ＬＥＤ１５を発光させる（図２（ｅ））。続いて、故障検出制御回路１８は、ＣＰＵ１１の制御により、故障検出マスク信号の出力を停止して、故障検出回路１６の動作の無効を解除する（図２（ｃ））。故障検出回路１６は、故障検出制御回路１８を介してＣＰＵ１１の制御により、返送信号を監視し、故障検出を行う。ＣＰＵ１１は、事故診断モードをオンにして故障検出回路１６の検出結果の判定を行い（図２（ｆ））、異常がなければ運転を再開する。
【００２０】
本実施の形態によれば、電力変換装置が長時間運転を停止するとき返送信号用ＬＥＤ１５は消光されるので、返送信号用ＬＥＤ１５の寿命低下を防止することができる。従って、返送信号用ＬＥＤ１５の寿命を指令信号用ＬＥＤ１３の寿命と同程度にすることができる。
【００２１】
また、本実施の形態によれば、故障検出回路１６の動作を無効とした後に返送信号用ＬＥＤ１５を消光させるので、点消弧監視装置は電力変換装置が長時間運転を停止するとき返送信号用ＬＥＤ１５からの出力光が検出されなくても故障と判断しない。
【００２２】
さらに、本実施の形態によれば、電力変換装置が長時間運転を停止した後運転を再開する前に故障検出を行うので、運転停止中に指令信号用ＬＥＤ１３又は返送信号用ＬＥＤ１５の故障や、指令信号用光ファイバ２０又は返送信号用光ファイバ４０の断線等が発生しても、運転再開前に故障を検出して事故を未然に防止することができる。
【００２３】
本実施の形態では発光素子として発光ダイオードを用いたが、本発明の返送信号用発光素子及び指令信号用発光素子は、レーザダイオード等の他の発光素子でもよい。また、本発明の電力変換装置のスイッチングデバイスとしては、例えば、スイッチング素子として絶縁ゲートバイポーラモードトランジスタを用いるとともに、光信号によるオン・オフ制御指令を受けて前記スイッチング素子を点弧・消弧させるゲートドライブを備えた構成とすることができるが、本発明におけるスイッチングデバイスはこれに限らず、光信号によりオン・オフ制御される構成であればよい。
【００２４】
【発明の効果】
本発明によれば、電力変換装置が長時間運転を停止するとき返送信号を発生する発光素子は消光されるので、返送信号を発生する発光素子の寿命低下を防止することができる。
【図面の簡単な説明】
【図１】 本発明の一実施の形態による電力変換装置のブロック図である。
【図２】 本発明の一実施の形態による電力変換装置の動作を説明するタイミングチャートである。
【図３】 従来の電力変換装置のブロック図である。
【図４】 従来の電力変換装置の動作を説明するタイミングチャートである。
【符号の説明】
１０ａ…制御装置側監視装置、１０ｂ…デバイス側監視装置、１１…ＣＰＵ、
１２，１４…ＬＥＤ駆動回路、１３…指令信号用ＬＥＤ、
１５…返送信号用ＬＥＤ、１６…故障検出回路、１７…ＬＥＤ消光制御回路、
１８…故障検出制御回路、２０…指令信号用光ファイバ、
３０…スイッチングデバイス、４０…返送信号用光ファイバ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a point-extinguishing monitoring device that monitors the operation of a switching device that is controlled to be turned on and off by an optical signal, and a power conversion device including the same, and is particularly suitable when the power conversion device stops operation for a long time. The present invention relates to a point-extinguishing monitoring apparatus and a power conversion apparatus including the same.
[0002]
[Prior art]
In a power converter using a switching device that is controlled to be turned on / off by an optical signal, in order to prevent accidents caused by failure of a light emitting element that generates the optical signal or disconnection of the optical transmission line that transmits the optical signal, A point extinguishing monitoring device for monitoring the operation is provided.
[0003]
FIG. 3 is a block diagram of a conventional power converter. The point-extinguishing monitoring device includes a control device-side monitoring device 10c provided on the control device side of the power conversion device and a device-side monitoring device 10b provided on the switching device 30 side. The control device side monitoring device 10c includes a command signal LED (light emitting diode) 13 that generates a command signal for controlling the on / off of the switching device 30, an LED drive circuit 12 that drives the command signal LED 13, and the device side monitoring device 10b. A failure detection circuit 16 that detects a failure by monitoring the return signal of the signal, and a CPU 11 that controls them. The device-side monitoring device 10b includes a return signal LED 15 that generates a return signal, and an LED drive circuit 14 that drives the return signal LED 15.
[0004]
During operation of the power conversion device, the LED drive circuit 12 of the control device-side monitoring device 10c drives the command signal LED 13 under the control of the CPU 11, and the command signal LED 13 emits light and is turned off when the switching device 30 is controlled to be on. When the state is controlled, the light is extinguished to generate a command signal for the switching device 30. The command signal from the command signal LED 13 is transmitted to the switching device 30 through the command signal optical fiber 20. The switching device 30 is controlled to an on state or an off state in accordance with a command signal. The LED drive circuit 14 of the device-side monitoring device 10b extinguishes the return signal LED 15 when the switching device 30 is in the on state, and causes the return signal LED 15 to emit light when the switching device 30 is in the off state. Is generated.
[0005]
The output light from the return signal LED 15 is transmitted as a return signal corresponding to the OFF state of the switching device 30 through the return signal optical fiber 40 to the failure detection circuit 16 of the control device side monitoring device 10c. The failure detection circuit 16 monitors the return signal under the control of the CPU 11, and detects the output light from the return signal LED 15 when a command signal for controlling the switching device 30 to be turned on is generated from the control device side monitoring device 10c. When the command signal for controlling the switching device 30 to be in the OFF state is generated, it is recognized as normal by detecting the output light from the return signal LED 15.
[0006]
FIG. 4 is a timing chart for explaining the operation of the conventional power converter. When the command signal LED emits light, the return signal LED is extinguished, and when the command signal LED is extinguished, the return signal LED emits light. In the power converter, normally, during operation, the switching device is controlled so as to alternately turn on and off at very short time intervals and repeat the on state and the off state alternately. Corresponding to the above, the command signal LED and the return signal LED repeat light emission and extinction in a very small time. On the other hand, during operation stop, the switching device is controlled so as to be always in the off state.
[0007]
[Problems to be solved by the invention]
The conventional point-extinguishing monitoring device does not emit the return signal LED when the switching device is in the on state, and always emits the return signal LED when the switching device is in the off state, from the viewpoint of failsafe. It was. Therefore, since the switching device is always in the OFF state while the operation of the power converter is stopped, the return signal LED always emits light. As a result, even if a failure occurs in the command signal LED or the return signal LED or disconnection of the command signal optical fiber or the return signal optical fiber during operation stoppage, the failure is detected before the operation is restarted. Can be prevented in advance.
[0008]
However, the return signal LED always emits light even while the power converter has stopped operating for a long period of time, such as during nighttime stoppages or during nighttime when driving at low electricity rates. Therefore, there has been a problem that the return signal LED has a shorter life as a light emitting element than the command signal LED.
[0009]
In general, a light emitting diode is used as a light emitting element. However, since the life of the light emitting diode varies depending on the usage time, temperature, etc., it is necessary to periodically inspect the light amount and replace it when the light amount decreases. For this reason, from the viewpoint of maintenance of the apparatus, it is desired to make the life of the light-emitting diode for return signal the same as the life of the light-emitting diode for command signal.
[0010]
An object of the present invention is to prevent a reduction in the lifetime of a light emitting element that generates a return signal.
[0011]
[Means for Solving the Problems]
The point-extinguishing monitoring device according to the present invention emits light when controlling a switching device that is on / off controlled by an optical signal to an on state and extinguishes when controlling the switching device to an off state, and sends a command signal to the switching device. Generated are a command signal light emitting element, a return signal light emitting element that is extinguished when the switching device is in an on state and emits a light when the switching device is in an off state, and a return signal light emitting element. A failure detection means for monitoring the returned signal to detect a failure, a failure detection control means for invalidating the operation of the failure detection means, and a quenching control means for quenching the return signal light emitting element, and having a switching device When the power converter stops operation for a certain period of time, the failure detection control means After disabling the operation of the one in which quenching control means extinguishing the light-emitting element return signal. When the power conversion device stops operation for a long time, the return signal light emitting element is extinguished by the extinction control means and the lifetime is not reduced. At this time, since the failure detection control means invalidates the operation of the failure detection means, the point-extinguishing monitoring device does not determine that there is a failure even if a return signal is not detected.
[0012]
In addition, the point-extinguishing monitoring device according to the present invention sends back the extinguishing control means before the power conversion device having the switching device that is controlled to be turned on / off by the optical signal has stopped operating for a certain period of time or before restarting the operation. The extinction of the signal light emitting element is canceled, the failure detection control means cancels the invalidity of the operation of the failure detection means, and the failure detection means detects the failure. Thereby, even if a failure of the light emitting element or disconnection of the optical transmission path occurs while the power conversion device has been stopped for a long time, the failure is detected before the operation is restarted to prevent an accident.
[0013]
A power conversion device according to the present invention includes the above-described point-extinguishing monitoring device in a power conversion device including a switching device that is on / off controlled by an optical signal.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram of a power converter according to an embodiment of the present invention. The point-extinguishing monitoring device according to the present embodiment includes a control device-side monitoring device 10a provided on the control device side of the power conversion device and a device-side monitoring device 10b provided on the switching device 30 side. The control device side monitoring device 10a includes a command signal LED (light emitting diode) 13 that generates a command signal for controlling the on / off of the switching device 30, an LED drive circuit 12 that drives the command signal LED 13, and the device side monitoring device 10b. A failure detection circuit 16 that detects a failure by monitoring the return signal of the device, a failure detection control circuit 18 that invalidates the operation of the failure detection circuit 16, and an LED extinction control circuit 17 that quenches the return signal LED 15 of the device-side monitoring device 10b. And a CPU 11 for controlling them. The device-side monitoring device 10b includes a return signal LED 15 that generates a return signal, and an LED drive circuit 14 that drives the return signal LED 15.
[0015]
During operation of the power conversion device, the LED drive circuit 12 of the control device side monitoring device 10a drives the command signal LED 13 under the control of the CPU 11, and the command signal LED 13 emits light and is turned off when the switching device 30 is controlled to be on. When the state is controlled, the light is extinguished to generate a command signal for the switching device 30. The command signal from the command signal LED 13 is transmitted to the switching device 30 through the command signal optical fiber 20. The switching device 30 is controlled to an on state or an off state in accordance with a command signal. The LED drive circuit 14 of the device-side monitoring device 10b extinguishes the return signal LED 15 when the switching device 30 is in the on state, and causes the return signal LED 15 to emit light when the switching device 30 is in the off state. Is generated.
[0016]
The output light from the return signal LED 15 is transmitted as a return signal corresponding to the OFF state of the switching device 30 through the return signal optical fiber 40 to the failure detection circuit 16 of the control device side monitoring device 10a. The failure detection circuit 16 monitors the return signal under the control of the CPU 11 via the failure detection control circuit 18, and returns a return signal when a command signal for controlling the switching device 30 to be turned on is generated from the control device side monitoring device 10a. When the output light from the return LED 15 is detected, when the command signal for controlling the switching device 30 to be turned off is generated, the output light from the return signal LED 15 is detected as normal. .
[0017]
Next, an operation when the power conversion device stops operation for a certain time or more and then resumes operation will be described. FIG. 2 is a timing chart for explaining the operation of the power conversion apparatus according to the embodiment of the present invention.
[0018]
When the power conversion device stops operation for a certain time or more, the failure detection control circuit 18 of the control device side monitoring device 10a outputs a failure detection mask signal for invalidating the operation of the failure detection circuit 16 under the control of the CPU 11. 16 (FIG. 2 (c)). Thereby, the failure detection circuit 16 does not detect the failure. Subsequently, the LED quenching control circuit 17 outputs an LED quenching signal for quenching the return signal LED 15 to the LED drive circuit 14 under the control of the CPU 11 (FIG. 2D). As a result, the LED drive circuit 14 extinguishes the return signal LED 15 (FIG. 2E).
[0019]
When the power conversion device resumes operation, the LED quenching control circuit 17 stops the output of the LED quenching signal and cancels the quenching of the return signal LED 15 under the control of the CPU 11 (FIG. 2D). As a result, the LED drive circuit 14 causes the return signal LED 15 to emit light (FIG. 2E). Subsequently, the failure detection control circuit 18 stops the output of the failure detection mask signal under the control of the CPU 11 and cancels the invalidity of the operation of the failure detection circuit 16 (FIG. 2C). The failure detection circuit 16 monitors the return signal and performs failure detection under the control of the CPU 11 via the failure detection control circuit 18. The CPU 11 turns on the accident diagnosis mode, determines the detection result of the failure detection circuit 16 (FIG. 2 (f)), and restarts the operation if there is no abnormality.
[0020]
According to the present embodiment, since the return signal LED 15 is extinguished when the power converter stops operation for a long time, it is possible to prevent the life of the return signal LED 15 from being reduced. Therefore, the life of the return signal LED 15 can be made substantially equal to the life of the command signal LED 13.
[0021]
In addition, according to the present embodiment, the return signal LED 15 is extinguished after the operation of the failure detection circuit 16 is invalidated, so that the point extinction monitoring device is used for the return signal when the power converter stops operation for a long time. Even if the output light from the LED 15 is not detected, it is not determined as a failure.
[0022]
Furthermore, according to the present embodiment, the failure detection is performed before the operation is resumed after the power conversion device has stopped operating for a long time, so that the failure of the command signal LED 13 or the return signal LED 15 during the operation stop, Even if the command signal optical fiber 20 or the return signal optical fiber 40 is disconnected, a failure can be detected before the operation is restarted to prevent an accident.
[0023]
In the present embodiment, a light emitting diode is used as the light emitting element. However, the light emitting element for return signal and the light emitting element for command signal of the present invention may be other light emitting elements such as a laser diode. In addition, as a switching device of the power conversion device of the present invention, for example, an insulated gate bipolar mode transistor is used as a switching element, and a gate for starting and extinguishing the switching element in response to an on / off control command by an optical signal Although it can be set as the structure provided with the drive, the switching device in this invention is not restricted to this, What is necessary is just the structure on / off-controlled by an optical signal.
[0024]
【The invention's effect】
According to the present invention, since the light emitting element that generates the return signal is extinguished when the power converter stops operating for a long time, it is possible to prevent the life of the light emitting element that generates the return signal from being reduced.
[Brief description of the drawings]
FIG. 1 is a block diagram of a power conversion device according to an embodiment of the present invention.
FIG. 2 is a timing chart for explaining the operation of the power conversion device according to the embodiment of the present invention.
FIG. 3 is a block diagram of a conventional power conversion device.
FIG. 4 is a timing chart for explaining the operation of a conventional power converter.
[Explanation of symbols]
10a ... control device side monitoring device, 10b ... device side monitoring device, 11 ... CPU,
12, 14 ... LED drive circuit, 13 ... LED for command signal,
15 ... LED for return signal, 16 ... Fault detection circuit, 17 ... LED extinction control circuit,
18 ... Fault detection control circuit, 20 ... Command signal optical fiber,
30 ... Switching device, 40 ... Return signal optical fiber

Claims (4)

光信号によりオン・オフ制御されるスイッチングデバイスをオン状態に制御する時に発光するとともに前記スイッチングデバイスをオフ状態に制御する時に消光して前記スイッチングデバイスに対する指令信号を発生する指令信号用発光素子と、
前記スイッチングデバイスがオン状態にある時に消光するとともに前記スイッチングデバイスがオフ状態にある時に発光して返送信号を発生する返送信号用発光素子と、
前記返送信号用発光素子が発生した返送信号を監視して故障を検出する故障検出手段と、
前記故障検出手段の動作を無効とする故障検出制御手段と、
前記返送信号用発光素子を消光させる消光制御手段とを備え、
前記スイッチングデバイスを有する電力変換装置が一定時間以上運転を停止するとき、
前記故障検出制御手段が前記故障検出手段の動作を無効とした後、
前記消光制御手段が前記返送信号用発光素子を消光させることを特徴とする点消弧監視装置。A command signal light emitting element that emits light when controlling a switching device that is controlled to be turned on and off by an optical signal and that is extinguished when the switching device is controlled to be turned off and generates a command signal for the switching device;
A return signal light emitting element that is extinguished when the switching device is in an on state and emits a light when the switching device is in an off state to generate a return signal;
Failure detection means for detecting a failure by monitoring a return signal generated by the return signal light emitting element;
Failure detection control means for invalidating the operation of the failure detection means;
Quenching control means for quenching the light emitting element for return signal,
When the power conversion device having the switching device stops operation for a certain time or more,
After the failure detection control means invalidates the operation of the failure detection means,
The point-extinguishing monitoring apparatus, wherein the extinction control means extinguishes the return signal light emitting element. 前記電力変換装置が一定時間以上運転を停止した後運転を再開する前に、
前記消光制御手段が前記返送信号用発光素子の消光を解除し、
前記故障検出制御手段が前記故障検出手段の動作の無効を解除して、
前記故障検出手段が故障検出を行うことを特徴とする請求項１に記載の点消弧監視装置。Before restarting the operation after the power converter stops operation for a certain time or more,
The quenching control means cancels the quenching of the return signal light emitting element,
The failure detection control means cancels the invalidity of the operation of the failure detection means,
The point-extinguishing monitoring apparatus according to claim 1, wherein the failure detection unit performs failure detection. 光信号によりオン・オフ制御されるスイッチングデバイスを備えた電力変換装置において、
前記スイッチングデバイスをオン状態に制御する時に発光するとともに前記スイッチングデバイスをオフ状態に制御する時に消光して前記スイッチングデバイスに対する指令信号を発生する指令信号用発光素子と、
前記スイッチングデバイスがオン状態にある時に消光するとともに前記スイッチングデバイスがオフ状態にある時に発光して返送信号を発生する返送信号用発光素子と、
前記返送信号用発光素子が発生した返送信号を監視して故障を検出する故障検出手段と、
前記故障検出手段の動作を無効とする故障検出制御手段と、
前記返送信号用発光素子を消光させる消光制御手段とを備え、
前記電力変換装置が一定時間以上運転を停止するとき、
前記故障検出制御手段が前記故障検出手段の動作を無効とした後、
前記消光制御手段が前記返送信号用発光素子を消光させる点消弧監視装置を設けたことを特徴とする電力変換装置。In a power converter having a switching device that is controlled to be turned on and off by an optical signal,
A command signal light emitting element that emits light when controlling the switching device to the on state and extinguishes when controlling the switching device to the off state and generates a command signal for the switching device;
A return signal light emitting element that is extinguished when the switching device is in an on state and emits a light when the switching device is in an off state to generate a return signal;
Failure detection means for detecting a failure by monitoring a return signal generated by the return signal light emitting element;
Failure detection control means for invalidating the operation of the failure detection means;
Quenching control means for quenching the light emitting element for return signal,
When the power converter stops operation for a certain period of time,
After the failure detection control means invalidates the operation of the failure detection means,
A power conversion device, wherein the extinction control means includes a point arc extinguishing monitoring device that extinguishes the return signal light emitting element. 前記点消弧監視装置は、
前記電力変換装置が一定時間以上運転を停止した後運転を再開する前に、
前記消光制御手段が前記返送信号用発光素子の消光を解除し、
前記故障検出制御手段が前記故障検出手段の動作の無効を解除して、
前記故障検出手段が故障検出を行うことを特徴とする請求項３に記載の電力変換装置。The point arc extinguishing monitoring device is
Before restarting the operation after the power converter stops operation for a certain time or more,
The quenching control means cancels the quenching of the return signal light emitting element,
The failure detection control means cancels the invalidity of the operation of the failure detection means,
The power conversion apparatus according to claim 3, wherein the failure detection unit performs failure detection.
JP2001133707A 2001-04-27 2001-04-27 Point-extinguishing monitoring device and power conversion device Expired - Lifetime JP4366883B2 (en)

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