JPH01114362A - Optical gate signal generation circuit - Google Patents

Optical gate signal generation circuit

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Publication number
JPH01114362A
JPH01114362A JP27276287A JP27276287A JPH01114362A JP H01114362 A JPH01114362 A JP H01114362A JP 27276287 A JP27276287 A JP 27276287A JP 27276287 A JP27276287 A JP 27276287A JP H01114362 A JPH01114362 A JP H01114362A
Authority
JP
Japan
Prior art keywords
switching element
signal generation
gate signal
optical
generation circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP27276287A
Other languages
Japanese (ja)
Inventor
Kenji Baba
謙二 馬場
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP27276287A priority Critical patent/JPH01114362A/en
Publication of JPH01114362A publication Critical patent/JPH01114362A/en
Pending legal-status Critical Current

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  • Power Conversion In General (AREA)

Abstract

PURPOSE:To reduce accidents to the minimum by providing the second switching elements cutting off in case of accident current. CONSTITUTION:An optical gate signal generation circuit 2 of a power converter 1 connects light emission elements LD1-LDn to be corresponded through optical fibers LG1-LGn to light thyristors T1-Tn in series, and is constituted by connecting to DC power 3 through current limiting resistance 4 and a switching element 5, then a gate controlling circuit 6 is connected to a gate of the said element 5. At this time, the second switching element 7 is connected to the switching element 5 in series, this element 7 is normally kept in 'on' condition, to a gate of which a accident decision circuit 8 is connected, and is controlled. The accident decision circuit 8 decides whether an energized time width of the gate signal generation circuit 2 is normal, and is constituted of an oscillator 9, a counter 10 and others, both ends current value of the current limiting resistance 4 is inputted into one part of a comparator 11. Accordingly, even if an abnormality occurs due to noises and others, the second element 7 is turned off to disconnect the light emitting element LD from the power supply 3.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、光サイリスタを適用した変換器の光ゲート信
号発生回路で、この回路を駆動する素子の故障に対して
発光素子を保護する機能を備えた光ゲート信号発生回路
に関する。
[Detailed Description of the Invention] [Industrial Application Field] The present invention is an optical gate signal generation circuit for a converter using an optical thyristor, and has a function of protecting a light emitting element against failure of an element driving the circuit. The present invention relates to an optical gate signal generation circuit comprising:

〔従来の技術〕[Conventional technology]

光サイリスタを適用した高電圧電力変換装置には、多数
の光サイリスタを直列に接続して各相アームを構成し、
主回路と制御回路との絶縁を光ファイバで行うとともに
光ゲート信号発生回路よりの光点弧信号を該光ファイバ
を介して供給するように構成したものが知られている。
A high voltage power conversion device using optical thyristors has a large number of optical thyristors connected in series to form each phase arm.
It is known that the main circuit and the control circuit are insulated by an optical fiber, and a light firing signal from an optical gate signal generation circuit is supplied via the optical fiber.

第4図はその一例を示すもので、光サイリスタの点弧源
である発光素子を備えた従来の光ゲート信号発生回路図
である。
FIG. 4 shows an example of this, and is a diagram of a conventional optical gate signal generation circuit equipped with a light emitting element which is an ignition source of an optical thyristor.

図中1は電力変換装置の1ア一ム分を示し、T1〜Tn
は光サイリスタである。
In the figure, 1 indicates 1 arm of the power converter, T1 to Tn
is an optical thyristor.

図中2は光ゲート信号発生回路で、前記光サイリスタT
、xTnをゲート駆動する発光素子LD。
2 in the figure is an optical gate signal generation circuit, and the optical thyristor T
, xTn.

〜LDnが直列に接続され、光ファイバLG、〜LGn
を介して光サイリスタT、xTnに対応する。
~LDn are connected in series, optical fibers LG, ~LGn
It corresponds to the optical thyristor T, xTn via.

そして、これら発光素子LD+−LDnは直流電源3に
限流抵抗4及び電流をオン、オフ制御するスイッチング
素子5を介して接続される。図中6は、該スイッチング
素子5を制御するためのゲ−ト制御回路である。
These light emitting elements LD+-LDn are connected to a DC power source 3 via a current limiting resistor 4 and a switching element 5 that controls current on and off. 6 in the figure is a gate control circuit for controlling the switching element 5. In FIG.

前記第4図に示す回路において、発光素子LD。In the circuit shown in FIG. 4, the light emitting element LD.

〜LDnの駆動はスイッチング素子5をオンさせること
により、直流電源3より限流抵抗4を介し一定の電流を
流すことにより、達成される。
The driving of ~LDn is achieved by turning on the switching element 5 and causing a constant current to flow from the DC power supply 3 through the current limiting resistor 4.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

前記のごとき光ゲート信号発生回路2に使用する発光素
子LD、〜LDnには、光ファイバLG。
Optical fibers LG are used for the light emitting elements LD, -LDn used in the optical gate signal generation circuit 2 as described above.

〜LGnの光伝送系の伝送損失と直列接続された光サイ
リスタT、xTnの点弧特性を考慮して数百mW〜数W
数カ出力可能光素子を必要とする。
~ Several hundred mW to several W, taking into account the transmission loss of the LGn optical transmission system and the firing characteristics of the optical thyristors T and xTn connected in series.
Requires several output-capable optical elements.

そしてこのような出力を低コストで得られる半導体素子
としてはレーザーダイオードが適している。
A laser diode is suitable as a semiconductor element that can obtain such an output at low cost.

しかしながら高出力で直流電流を連続して流せるレーザ
ーダイオードは現在のところ世の中に無く、使用に当た
ってはパルス幅の制約条件を満足する必要がある。
However, there are currently no laser diodes in the world that can continuously flow a high-output DC current, and when used, it is necessary to satisfy constraints on pulse width.

ところで、スイッチング素子5の短絡故障及び該スイッ
チング素子5を制御するゲート制御回路6の故障(例え
ばノイズ等による長幅パルス駆動)が生じると、発光素
子(レーザーダイオード)LDI〜LDnに直流連続あ
るいは長幅の電流を通流させる可能性があり、直流連続
通流不可能なレーザーダイオードは内部発熱によってレ
ーザー出射面上の壁間面が溶解して発光機能が失われ、
結果的に破壊に至ることになる。
By the way, if a short-circuit failure occurs in the switching element 5 or a failure in the gate control circuit 6 that controls the switching element 5 (e.g., due to long-width pulse drive due to noise, etc.), continuous DC or long current is applied to the light emitting elements (laser diodes) LDI to LDn. Laser diodes that cannot conduct continuous DC current will lose their light-emitting function due to internal heat generation that melts the wall-to-wall surface above the laser emission surface.
The result will be destruction.

本発明の目的は前記従来例の不都合を解消し、スイッチ
ング素子の短絡故障及びノイズによる長幅パルス駆動の
異常が発生した場合に、発光素子の破壊を防止して、信
頼度の高い光サイリスタの光ゲート信号発生回路を提供
することにある。
An object of the present invention is to eliminate the disadvantages of the conventional example, prevent destruction of the light emitting element in the event of a short-circuit failure of the switching element or abnormality in long pulse drive due to noise, and provide a highly reliable optical thyristor. An object of the present invention is to provide an optical gate signal generation circuit.

〔問題点を解決するための手段〕[Means for solving problems]

本発明は前記目的を達成するため、電力変換装置を構成
する光サイリスタに対応した発光素子と、これに直列に
接続される直流電源と、限流抵抗及び電流制御のスイッ
チング素子を備えた光サイリスタのゲート信号発生回路
において、前記スイッチング素子に通常オンしている第
2のスイッチング素子を直列に接続し、該第2のスイッ
チング素子を回路のオン電流を検出して異常時にオフす
ることを要旨とするものである。
In order to achieve the above object, the present invention provides an optical thyristor comprising a light emitting element corresponding to an optical thyristor constituting a power conversion device, a DC power supply connected in series to the light emitting element, a current limiting resistor and a current control switching element. In the gate signal generation circuit, a second switching element which is normally turned on is connected in series with the switching element, and the second switching element is turned off in the event of an abnormality by detecting the on-current of the circuit. It is something to do.

〔作用〕[Effect]

本発明によれば、スイッチング素子の短絡故障及びノイ
ズによる長幅パルス駆動の異常が発生した場合に、これ
を検出し、第2のスイッチング素子がオフして発光素子
を電源から切離す。
According to the present invention, when a short-circuit failure of a switching element or an abnormality in long pulse drive due to noise occurs, this is detected, and the second switching element is turned off to disconnect the light emitting element from the power source.

〔実施例〕〔Example〕

以下、図面について本発明の実施例を詳細に説明する。 Embodiments of the present invention will be described in detail below with reference to the drawings.

第1図は本発明の光ゲート信号発生回路の1実施例を示
す回路図で、前記従来例を示す第4図と同一構成要素に
は同一参照符号を付したものである。
FIG. 1 is a circuit diagram showing one embodiment of the optical gate signal generation circuit of the present invention, and the same components as in FIG. 4 showing the conventional example are given the same reference numerals.

すなわち、図中1は光サイリスタT、〜Tnを直列接続
してなる電力変換装置の1ア一ム分であり、2は光ゲー
ト信号発生回路である。
That is, in the figure, numeral 1 represents one arm of a power conversion device formed by serially connecting optical thyristors T, -Tn, and numeral 2 represents an optical gate signal generation circuit.

光ゲート信号発生回路2は光サイリスタT、〜Tnに光
ファイバLG+NLGnを介して対応する発光素子LD
+”LDnを直列接続してなるが、これら発光素子LD
I −t、Dnは直流電源3に限流抵抗4及びスイッチ
ング素子5を介して接続され、該スイッチング素子5の
ゲートにはゲート制御回路6が接続される。
The optical gate signal generation circuit 2 connects the light emitting elements LD to the optical thyristors T, ~Tn via optical fibers LG+NLGn.
+”LDn are connected in series, but these light emitting elements LD
I-t and Dn are connected to a DC power source 3 via a current limiting resistor 4 and a switching element 5, and a gate control circuit 6 is connected to the gate of the switching element 5.

以上は前記従来例と同じであるが、本発明はこのような
回路において、スイッチング素子5に第2のスイッチン
グ素子7を直列に接続した。
Although the above is the same as the conventional example, the present invention connects the second switching element 7 to the switching element 5 in series in such a circuit.

この第2のスイッチング素子7は通常はオン状態のもの
であり、そのゲートには故障判断回路8が接続され、こ
れによりコントロールされる。
This second switching element 7 is normally in an on state, and a failure determination circuit 8 is connected to its gate and controlled by this.

該故障判断回路8は、ゲート信号発生回路2に流れてい
る電流の時間幅が正常であるか異常であるかを判断する
もので、発振器9、カウンタ10、コンパレータ11、
フリツプフロツプ12、リセットスイッチ13で構成さ
れ、限流抵抗4の両端電流値をコンパレータ11の一方
の入力とする。
The failure determination circuit 8 determines whether the time width of the current flowing through the gate signal generation circuit 2 is normal or abnormal, and includes an oscillator 9, a counter 10, a comparator 11,
It is composed of a flip-flop 12 and a reset switch 13, and the current value across the current limiting resistor 4 is used as one input of the comparator 11.

次に動作について説明すると、第2図に示すように、い
ま、第2のスイッチング素子7を常時オンにして第1の
スイッチング素子5をゲート制御回路6の信号Aにより
動作させると、発光素子LD。
Next, to explain the operation, as shown in FIG. .

〜LDnには直流電源3より限流抵抗4で制限された電
流iが流れ、光ゲート信号Bが発生する。
A current i limited by the current limiting resistor 4 flows from the DC power source 3 through LDn, and a light gate signal B is generated.

このとき、限流抵抗4の両端にはCのような電流iと同
じ時間幅の波形が現れることから、この回路に流れてい
る電流の幅を検出できる。
At this time, since a waveform such as C having the same time width as the current i appears at both ends of the current limiting resistor 4, the width of the current flowing in this circuit can be detected.

故障判断回路8では、発振器9により出力される信号り
をカウンタ10で所望の時間幅Eを決定し、前記検出し
た信号Cが所望の時間幅E以内であれば正常であり、カ
ウンタ10の出力は“L′を維持し、フリップフロップ
12出力は“L”で第2のスイッチング素子7はオン状
態を継続する。
In the failure determination circuit 8, a counter 10 determines a desired time width E for the signal output from the oscillator 9, and if the detected signal C is within the desired time width E, it is normal and the output of the counter 10 is determined. maintains "L'", the output of the flip-flop 12 is "L", and the second switching element 7 continues to be in the on state.

これとは逆に、所望の時間幅Eより検出信号Cが長くな
った場合、カウンタ出力は所望の時間幅Eで“H”とな
り、フリップフロップ12がSETされ、その出力“H
”により、第2のスイッチング素子7をオフ状態へと移
行して、回路電流をしゃ断することができる。
On the contrary, when the detection signal C becomes longer than the desired time width E, the counter output becomes "H" in the desired time width E, the flip-flop 12 is set, and its output becomes "H".
”, the second switching element 7 can be turned off and the circuit current can be cut off.

〔発明の効果〕〔Effect of the invention〕

以上述べたように本発明の光ゲート信号発生回路は、事
故電流時にしゃ断する第2のスイッチング素子を設けた
ことにより、通常のオン、オフに用いるスイッチング素
子の短絡故障及びノイズ等での長幅パルス駆動が発生し
ても、高出力でパルス定格のレーザーダイオードが破壊
することな(運転することが可能となり、事故を最小限
に抑えることができるものである。
As described above, the optical gate signal generation circuit of the present invention is provided with a second switching element that shuts off in the event of a fault current, so that the switching element used for normal on/off operations has a long width due to short-circuit failures, noise, etc. Even if pulse drive occurs, high-output, pulse-rated laser diodes can be operated without being destroyed, and accidents can be kept to a minimum.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の光ゲート信号発生回路の1実施例を示
す回路図、第2図は同上動作波形図、第3図は同上故障
判断回路での動作波形図、第4図は従来例を示す回路図
である。 1・・・電力変換器   2・・・ゲート信号発生回路
3・・・直流電源    4・・・限流抵抗5・・・ス
イッチング素子6・・・ゲート制御回路7・・・第2の
スイッチング素子 8・・・故障判断回路  9・・・発振器10・・・カ
ウンタ    11・・・コンパレータ12・・・フリ
ップフロップ13・・・リセットスイッチ14・・・イ
ンバータ T、〜Tn・・・光サイリスタ LG、〜LGn・・・光ファイバ LD、〜LDn・・・発光素子 第2図 第32
Fig. 1 is a circuit diagram showing one embodiment of the optical gate signal generation circuit of the present invention, Fig. 2 is an operating waveform diagram of the same as above, Fig. 3 is an operating waveform diagram of the same as above failure judgment circuit, and Fig. 4 is a conventional example. FIG. 1... Power converter 2... Gate signal generation circuit 3... DC power supply 4... Current limiting resistor 5... Switching element 6... Gate control circuit 7... Second switching element 8... Failure determination circuit 9... Oscillator 10... Counter 11... Comparator 12... Flip-flop 13... Reset switch 14... Inverter T, ~Tn... Optical thyristor LG, ~LGn...Optical fiber LD, ~LDn...Light emitting element Fig. 2, Fig. 32

Claims (1)

【特許請求の範囲】[Claims] 電力変換装置を構成する光サイリスタに対応した発光素
子と、これに直列に接続される直流電源と、限流抵抗及
び電流制御のスイッチング素子を備えた光サイリスタの
ゲート信号発生回路において、前記スイッチング素子に
通常オンしている第2のスイッチング素子を直列に接続
し、該第2のスイッチング素子を回路のオン電流を検出
して異常時にオフすることを特徴とする光ゲート信号発
生回路。
In an optical thyristor gate signal generation circuit comprising a light emitting element compatible with an optical thyristor constituting a power conversion device, a DC power supply connected in series to the light emitting element, a current limiting resistor and a current control switching element, the switching element An optical gate signal generation circuit characterized in that a second switching element which is normally turned on is connected in series, and the second switching element is turned off in the event of an abnormality by detecting the on-current of the circuit.
JP27276287A 1987-10-27 1987-10-27 Optical gate signal generation circuit Pending JPH01114362A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27276287A JPH01114362A (en) 1987-10-27 1987-10-27 Optical gate signal generation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27276287A JPH01114362A (en) 1987-10-27 1987-10-27 Optical gate signal generation circuit

Publications (1)

Publication Number Publication Date
JPH01114362A true JPH01114362A (en) 1989-05-08

Family

ID=17518391

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27276287A Pending JPH01114362A (en) 1987-10-27 1987-10-27 Optical gate signal generation circuit

Country Status (1)

Country Link
JP (1) JPH01114362A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2008142796A1 (en) * 2007-05-24 2010-08-05 東芝三菱電機産業システム株式会社 Semiconductor device
US9564829B2 (en) 2012-10-01 2017-02-07 Abb Technology Ltd Converter arm and associated converter device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2008142796A1 (en) * 2007-05-24 2010-08-05 東芝三菱電機産業システム株式会社 Semiconductor device
US9564829B2 (en) 2012-10-01 2017-02-07 Abb Technology Ltd Converter arm and associated converter device

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