JP2008099468A - Method for detecting turn-off of thyristor - Google Patents

Method for detecting turn-off of thyristor Download PDF

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JP2008099468A
JP2008099468A JP2006279605A JP2006279605A JP2008099468A JP 2008099468 A JP2008099468 A JP 2008099468A JP 2006279605 A JP2006279605 A JP 2006279605A JP 2006279605 A JP2006279605 A JP 2006279605A JP 2008099468 A JP2008099468 A JP 2008099468A
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circuit
thyristor
voltage
thyristors
gate
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JP4129276B2 (en
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Tomoyuki Shimazu
智幸 島津
Seiji Tsunemi
晟治 常味
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AIKOH EPOCH CORP
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • H02M5/12—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion of voltage or current amplitude only

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ac-Ac Conversion (AREA)
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for detecting turn-off of a thyristor for sure changing of a circuit, by not turning ON the thyristor of a different circuit, when a voltage exists between the gate and the cathode, and by connecting a voltage detection sensor between the gate and the cathode of the thyristor. <P>SOLUTION: In this method, a circuit where a circuit to which two thyristors are connected antiparallel is connected to a transformer; a circuit to which two other thyristors are connected antiparallel is connected to the transformer, control circuits are incorporated in the circuits and a voltage detector is connected between the gates and cathodes of the thyristors; an the gate signal of the thyristor of one of the circuits is turned on. Then, the load voltage is adjusted, without having to interrupt the supplying of power of a load of the transformer; and when the gate signal of the thyristor is turned OFF and detection voltage of the voltage detector becomes 0V at the time of turning off one circuit from ON and switching the other circuit from OFF to ON; and a control circuit detects and judges it as turn-on of the thyristor and turns on the gate signal of the other thyristor. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、サイリスタを使用する電気回路に関し、サイリスタのターンオフを瞬時に検出し、回路を変更することができるサイリスタのターンオフを検出する方法に関する。   The present invention relates to an electric circuit using a thyristor, and more particularly to a method for detecting a turn-off of a thyristor capable of instantaneously detecting the turn-off of the thyristor and changing the circuit.

出願人は省電力変圧器に関する特許を取得している。例えば、昇降同圧自律切替装置付き省電力変圧器（特開平８−１９１５４２号公報参照）は、単相三線式又は二線式の単巻コイル型変圧器において、入力端子Ｒ、Ｔと接続した複数組の主コイルＬ１、Ｌ２及びＬ５、Ｌ６を単相内鉄形コア（９）に２回路相巻きし、これらの各回路の主コイルＬ２とＬ６との端部間に、前記コア（９）に巻いて相互に直列に接続された複数組の励磁コイルＬ３、Ｌ７及びＬ４、Ｌ８を、複数の組み合わせ結線によって接続すると共に、前記入力端子に接続された電圧センサーの検知した電圧値によって、オン、オフとなる複数組のサイリスタ（１、２、３、４、５、６、７、８、）を前記端部間及び各励磁コイル間に設け、これらの各組のサイリスタ（１、２、３、４、５、６、７、８）のオン、オフによって、前記端部間及び各励磁コイル間の一組又は複数組を接続あるいはカットし、入力電圧に対する出力電圧を無停電で昇圧、同圧、降圧する回路に自律的に切替自在とした構成を有している。   The applicant has obtained a patent for a power-saving transformer. For example, a power saving transformer (see Japanese Patent Application Laid-open No. Hei 8-191542) with an up-and-down pressure automatic switching device is connected to input terminals R and T in a single-phase three-wire or two-wire single-coil transformer. Two or more sets of main coils L1, L2 and L5, L6 are wound around a single-phase inner iron core (9), and the core (9) is interposed between the ends of the main coils L2 and L6 of each circuit. ) And a plurality of sets of exciting coils L3, L7 and L4, L8 that are connected in series with each other, are connected by a plurality of combination wirings, and according to a voltage value detected by a voltage sensor connected to the input terminal, A plurality of sets of thyristors (1, 2, 3, 4, 5, 6, 7, 8,) that are turned on and off are provided between the end portions and between the exciting coils. 3, 4, 5, 6, 7, 8) One or more sets between the ends and each excitation coil are connected or cut, and the output voltage with respect to the input voltage can be autonomously switched to a circuit that boosts, equalizes, or steps down the voltage. is doing.

ところで、サイリスタが組み込まれる装置、例えば省電力変圧器等の装置は、上述した昇降同圧自律切替装置付き省電力変圧器のようにサイリスタに直接コイルとコイル間等に電圧センサーを接続して、電圧の検出を行い、入力電圧が設定電圧範囲外になったときに、回路を変更させる構造となっている。しかし、この構造では、サイリスタが組み込まれている回路を切り替える際にタイムラグが生じてしまい、切替を確実にするには複雑な制御が必要であった。
そこで、サイリスタが組み込まれた回路において、サイリスタがターンオフになった瞬間を簡単且つ確実にとらえることができる検出方法の開発が待たれていた。 By the way, a device in which a thyristor is incorporated, for example, a device such as a power saving transformer, connects a voltage sensor directly between the coils and the like to the thyristor like the power saving transformer with the above-described step-up and pressure equalizing autonomous switching device, The voltage is detected, and the circuit is changed when the input voltage falls outside the set voltage range. However, with this structure, a time lag occurs when switching the circuit in which the thyristor is incorporated, and complicated control is necessary to ensure switching.
Therefore, development of a detection method that can easily and reliably catch the moment when the thyristor is turned off in a circuit incorporating the thyristor has been awaited.

特開８−１９１５４２号JP-A-8-191542

上記問題を解決するため、本発明に係るサイリスタのターンオフを検出する方法は、サイリスタのゲート−カソード間に電圧検出センサーを接続することにより、ゲート−カソード間に電圧がある時は別の回路のサイリスタをＯＮにしないことで確実に回路の変更を可能とするサイリスタのターンオフを検出する方法を提供する事を目的としている。   In order to solve the above problem, the method for detecting the turn-off of the thyristor according to the present invention is to connect a voltage detection sensor between the gate and the cathode of the thyristor so that when there is a voltage between the gate and the cathode, It is an object of the present invention to provide a method for detecting turn-off of a thyristor that can change the circuit reliably without turning on the thyristor.

本発明に係るサイリスタのターンオフを検出する方法は、変圧器のタップ切り替えをサイリスタを用いて行い、負荷への電力供給を断つことなく、負荷への供給電圧を調整する装置において、２つのサイリスタ１０、２０が逆並列に接続されている回路１１を変圧器５０のタップＡに接続し、別の２つのサイリスタ３０、４０が逆並列に接続されている回路１２を変圧器５０のタップＢに接続し、それら回路１１及び回路１２には少なくとも一つの制御回路が組み込まれており、各サイリスタのゲート−カソード間に電圧検出器１０１、２０１、３０１、４０１を少なくとも一つ接続した回路で、回路１１のサイリスタ１０、２０のゲート信号をＯＮにするか、または、回路１２のサイリスタ３０、４０のゲート信号をＯＮにするかにより、変圧器５０の負荷６０への電力供給を断つことなく負荷の電圧調整をおこない、回路１１をＯＮ状態からＯＦＦ状態にして、回路１２をＯＦＦ状態からＯＮ状態に切替える際に、サイリスタ１０、２０のゲート信号をＯＦＦとし、電圧検出器１０１、２０１の検出電圧が０Ｖとなったときに、前記制御回路がサイリスタのターンオフとして検出・判断して、サイリスタ３０、４０のゲート信号をＯＮにする構成である。 The method for detecting turn-off of a thyristor according to the present invention includes two thyristors 10 in a device that performs switching of a transformer tap using a thyristor and adjusts a supply voltage to the load without interrupting power supply to the load. the circuit 11 20 are connected in inverse parallel connected to the tap a of transformer 50, connect the circuit 12 to another two thyristors 30 and 40 are connected in antiparallel tap B of transformer 50 and, in their circuit 11 and circuit 12 are at least one control circuit is incorporated, the gate of the thyristors - the circuit has at least one connecting a voltage detector 101,201,301,401 between the cathode, the circuit 11 either of the gate signal of the thyristor 10 and 20 to oN, or, by either the oN gate signal of the thyristor 30, 40 of the circuit 12, It performs voltage regulation without load to interrupt the power supply to the load 60 of the divider 50, and the circuit 11 from the ON state to the OFF state, when switching the circuit 12 from the OFF state to the ON state, the gate of the thyristor 10, 20 When the signal is turned off and the detection voltage of the voltage detectors 101 and 201 becomes 0 V, the control circuit detects and judges that the thyristor is turned off, and turns on the gate signals of the thyristors 30 and 40. .

以上詳述した通り、本発明に係るサイリスタのターンオフを検出する方法は、
１．任意のサイリスタのゲート−カソード間の電圧を電圧検出器により検出し、０Ｖである際に回路の切替を行うことにより、簡単な検出方法で確実に回路を変更できる方法を提供することができる。 As described above in detail, the method for detecting the turn-off of the thyristor according to the present invention is as follows.
1. By detecting the voltage between the gate and cathode of any thyristor with a voltage detector and switching the circuit when the voltage is 0 V, it is possible to provide a method that can reliably change the circuit with a simple detection method.

以下に、本発明に係るサイリスタのターンオフを検出する方法を図面に示す実施例により説明する。図１は本件発明のサイリスタのターンオフを検出する方法に関する回路図である。
本発明に係るサイリスタのターンオフを検出する方法は図１に示すような基本的な回路であるが、直流電源により電流を供給するインバータ装置のような、複雑な回路にも採用することができる。
図１の回路は、２つのサイリスタ１０、２０が逆並列に接続されている回路１１と、別の２つのサイリスタ３０、４０が逆並列に接続されている回路１２がそれぞれ変圧器５０のタップＡとタップＢに接続され、さらに制御回路７０が組み込まれて、電圧供給源８０が接続されている閉回路である。
変圧器５０は通常の変圧器で、タップＡとタップＢがあり、それぞれ回路１１および回路１２と接続しており、内部には一次巻線と、負荷が接続された２次巻線が設置されている。
制御回路７０は、電圧検出器１０１、２０１、３０１、４０１が測定した電圧を検出して、検出した電圧が０Ｖの時にサイリスタのターンオフと判断して自動的に別のゲート信号をＯＮにする回路である。電圧検出器１０１、２０１、３０１、４０１の測定データを検出するために、電圧検出器と直接接続している。 Hereinafter, a method for detecting turn-off of a thyristor according to the present invention will be described with reference to an embodiment shown in the drawings. FIG. 1 is a circuit diagram relating to a method for detecting turn-off of a thyristor according to the present invention.
The method for detecting the turn-off of the thyristor according to the present invention is a basic circuit as shown in FIG. 1, but it can also be used for a complicated circuit such as an inverter device that supplies current by a DC power source.
1 includes a circuit 11 in which two thyristors 10 and 20 are connected in anti-parallel and a circuit 12 in which another two thyristors 30 and 40 are connected in anti-parallel are taps A of a transformer 50, respectively. Is a closed circuit that is connected to the tap B, further includes a control circuit 70, and is connected to a voltage supply source 80.
Transformer 50 is a normal transformer, and has tap A and tap B, which are connected to circuit 11 and circuit 12 , respectively, and a primary winding and a secondary winding to which a load is connected are installed. ing.
The control circuit 70 detects the voltage measured by the voltage detectors 101, 201, 301, 401, and determines that the thyristor is turned off when the detected voltage is 0 V, and automatically turns on another gate signal. It is. In order to detect the measurement data of the voltage detectors 101, 201, 301, 401, it is directly connected to the voltage detector.

電圧検出器１０１、２０１、３０１、４０１は、それぞれのサイリスタ１０、２０、３０、４０のゲートＧとカソードＫに接続される。電圧検出器では、サイリスタのゲート−カソード間電圧を測定する。
図１では、全てのサイリスタのゲートと接点に電圧検出器が接続されている構成であり、少なくともいずれかのサイリスタに一つの電圧検出器を接続すればよいが、好ましくは全てのサイリスタに電圧検出器を接続することが望ましい。
回路１１のサイリスタ１０、２０および回路１２のサイリスタ３０、４０はそれぞれのゲート信号により、ＯＮ―ＯＦＦの制御がなされる。 The voltage detectors 101, 201, 301, 401 are connected to the gates G and cathodes K of the respective thyristors 10, 20, 30, 40. The voltage detector measures the gate-cathode voltage of the thyristor.
In FIG. 1, voltage detectors are connected to the gates and contacts of all thyristors, and it is sufficient to connect one voltage detector to at least one thyristor. Preferably, voltage detection is performed for all thyristors. It is desirable to connect a vessel.
The thyristors 10 and 20 of the circuit 11 and the thyristors 30 and 40 of the circuit 12 are ON / OFF controlled by the respective gate signals.

まず、回路１１を通して変圧器に電源を供給するには、ゲート信号１によりサイリスタのゲート・カソード間に電流を流し続ける。次に、回路１１をＯＦＦし変圧器への電力を遮断することなく回路１２をＯＮするには、ゲート信号１をＯＦＦし、ゲート信号２を、ＯＮするが、今まで電流が流れていたサイリスタ１０または、２０は、ゲート信号１をＯＦＦしても、サイリスタのアノード・カソード間の電圧の極性が反転するまで電流が流れ続ける。
この電流が流れ続けている間に、回路１２をＯＮ（ゲート信号２をＯＮ）すると、変圧器５０のタップＡ，Ｂに同時に同じ電源が接続されることになるので、短絡となり大きな短絡電流が流れてしまう。
そこで、ゲート信号１をＯＦＦした後、サイリスタ１０，２０のゲート・カソード間電圧を制御回路７０が電圧検出器１０１、２０１により電圧が０Ｖであることを検出することにより、サイリスタのターンオフ状態を検出し、電圧が０Ｖになった瞬間にゲート信号２をＯＮとし、切り替えを確実に行える。
また、同様に、回路１２のＯＮから、回路１１のＯＮに切り替えるときは、サイリスタ３０，４０のゲート・カソード間電圧を制御回路７０が電圧検出器３０１、４０１により検出し電圧が０Ｖである事（サイリスタのターンオフ）を検出してからゲート信号１をＯＮする。 First, in order to supply power to the transformer through the circuit 11 , a current is continuously supplied between the gate and the cathode of the thyristor by the gate signal 1. Next, in order to turn off the circuit 11 and turn on the circuit 12 without shutting off the power to the transformer, the gate signal 1 is turned off and the gate signal 2 is turned on. In 10 or 20, even if the gate signal 1 is turned off, the current continues to flow until the polarity of the voltage between the anode and the cathode of the thyristor is reversed.
If the circuit 12 is turned on (the gate signal 2 is turned on) while the current continues to flow, the same power source is connected to the taps A and B of the transformer 50 at the same time. It will flow.
Therefore, after turning off the gate signal 1, the control circuit 70 detects that the voltage is 0V by the voltage detectors 101 and 201, and detects the turn-off state of the thyristor. At the moment when the voltage becomes 0V, the gate signal 2 is turned on, so that the switching can be performed reliably.
Similarly, when switching the circuit 12 from ON to circuit 11 , the control circuit 70 detects the voltage between the gate and cathode of the thyristors 30 and 40 by the voltage detectors 301 and 401 and the voltage is 0V. The gate signal 1 is turned on after detecting (thyristor turn-off).

この実施例の回路を説明すると、それぞれの電圧検出器は、サイリスタのゲートＧとカソードＫに接続されている構成である。電圧供給源８０から電流を流すと、回路１１若しくは回路１２に電流が流れる構成であるが、この説明では回路１２に電流が流れていると仮定する。サイリスタの特性から、ゲート信号をＯＦＦしても、電流が流れているサイリスタは、電流が流れ続ける。この時は、電流が流れているサイリスタのゲートＧカソードＫ間に電圧が発生している状態である。この電圧を電圧検出器は検出しており、それぞれのサイリスタに対応して、電圧検出器１０１、２０１、３０１、４０１が検出を行っている。これは、サイリスタのアノード、カソード間に電流が流れている時（ターンオン時）には、サイリスタのゲート、カソード間に半導体のＰ−Ｎ接合による電圧降下（通常約０．５Ｖ程度）が必ず発生することに着目している。この実施例では、電圧検出器３０１と電圧検出器４０１は、回路１２のサイリスタ３０、４０のゲートＧとカソードＫ間に接続し常に電圧検出を行っている。回路１２に電流が流れている間にタップ切り替え指令がくると、制御回路７０は、まず、ゲート信号２を、ＯＦＦする。続いて、電圧検出器３０１、４０１の、検出値が０になるのを待ってから、回路１１のサイリスタ１０、２０へ、ゲート信号１を送出し回路１１のサイリスタに電流が流れるようにする。 The circuit of this embodiment will be described. Each voltage detector is connected to the gate G and the cathode K of the thyristor. When a current is supplied from the voltage supply source 80, a current flows through the circuit 11 or the circuit 12. However, in this description , it is assumed that a current flows through the circuit 12 . From the characteristics of the thyristor, even if the gate signal is turned OFF, the current continues to flow in the thyristor in which the current flows. At this time, a voltage is generated between the gate G cathode K of the thyristor through which a current flows. The voltage detector detects this voltage, and the voltage detectors 101, 201, 301, 401 detect the voltage corresponding to each thyristor. This is because when a current flows between the anode and cathode of the thyristor (when it is turned on), a voltage drop (usually about 0.5 V) is always generated between the gate and cathode of the thyristor due to the PN junction of the semiconductor. Focus on doing. In this embodiment, the voltage detector 301 and the voltage detector 401 are connected between the gate G and the cathode K of the thyristors 30 and 40 of the circuit 12 and always perform voltage detection. When a tap switching command is received while a current is flowing through the circuit 12 , the control circuit 70 first turns off the gate signal 2. Then, the voltage detector 301 and 401, the detection value waits to become 0, the thyristors 10 and 20 of the circuit 11, so that current flows through the thyristor sends a gate signal 1 circuit 11.

従来の省電力変圧器は、電圧検出器をサイリスタのゲート−カソード間ではなく、回路内に直接接続していたため、完全に電流が流れていないと思われる時間を経過させてから回路を切替えないと突入電流によりサイリスタが破損してしまう問題があった。つまり、回路を切替える際に回路を放置して電流がなくなる時間を設定しなければならなかった。完全に電流が流れていないことを確認するのに、従来の省電力変圧器は、コイルに電圧検出器を接続しているため、サイリスタを流れる電流ではなく回路全体を流れる電流が完全に０にならないと、回路の切替えができなかった。しかし、本件発明では、サイリスタのゲートとカソードに接続するように電圧検出器を設置するため、ゲート電圧が０Ｖのとき、すなわちサイリスタに電流が流れていないことを検出してから切替えが可能となっているため、回路を放置させる必要がなく、瞬時に回路を切替えることが可能となる。 Conventional power-saving transformers connect the voltage detector directly in the circuit, not between the gate and cathode of the thyristor, so that the circuit is not switched after a period of time when no current is expected to flow completely. There was a problem that the thyristor was damaged by the inrush current. In other words, when switching the circuit, it was necessary to set a time when the circuit was left and the current ceased. To confirm that no current is flowing completely, the conventional power-saving transformer has a voltage detector connected to the coil, so that the current flowing through the entire circuit is completely zero, not the current flowing through the thyristor. Otherwise, the circuit could not be switched. However, in the present invention, since the voltage detector is installed so as to be connected to the gate and the cathode of the thyristor, it is possible to switch when the gate voltage is 0 V, that is, after detecting that no current flows through the thyristor. Therefore, it is not necessary to leave the circuit unattended, and the circuit can be switched instantaneously.

本件発明は、図１に示すようにサイリスタのゲートと回路に電圧検出器を接続し、制御する方法であり、サイリスタのゲートと回路に電圧検出器を接続する構成であるため、サイリスタ１０、２０、３０、４０のいずれかのサイリスタに電圧検出器を接続しても、同じ効果が得られる。また、この実施例では簡単な回路図を用いたが、複雑な回路であっても、サイリスタのゲート−カソード間電圧を検出することにより、本発明を利用することができる。   The present invention is a method of connecting and controlling a voltage detector to the gate and circuit of the thyristor as shown in FIG. 1, and is configured to connect the voltage detector to the gate and circuit of the thyristor. , 30, or 40 can be connected to a voltage detector to obtain the same effect. Although a simple circuit diagram is used in this embodiment, the present invention can be used by detecting the gate-cathode voltage of the thyristor even if the circuit is complicated.

本発明のサイリスタのターンオフを検出する方法に関連する回路図Circuit diagram related to the method of detecting turn-off of the thyristor of the present invention

符号の説明Explanation of symbols

１、２ ゲート信号
１１、１２ 回路
１０、２０、３０、４０ サイリスタ
１０１、２０１、３０１、４０１ 電圧検出器
５０ 変圧器
６０ 負荷
７０ 制御回路
８０ 電圧供給源 1, 2 Gate signal
11, 12 Circuit 10, 20, 30, 40 Thyristor 101, 201, 301, 401 Voltage detector 50 Transformer 60 Load 70 Control circuit 80 Voltage supply source

Claims (1)

変圧器のタップ切り替えをサイリスタを用いて行い、負荷への電力供給を断つことなく、負荷への供給電圧を調整する装置において、２つのサイリスタ１０、２０が逆並列に接続されている回路１を変圧器５０のタップＡに接続し、別の２つのサイリスタ３０、４０が逆並列に接続されている回路２を変圧器５０のタップＢに接続し、それら回路１及び回路２には少なくとも一つの制御回路が組み込まれており、各サイリスタのゲートＧ−カソードＫ間に電圧検出器１０１、２０１、３０１、４０１を少なくとも一つ接続した回路で、回路１のサイリスタ１０、２０のゲート信号をＯＮにするか、または、回路２のサイリスタ３０、４０のゲート信号をＯＮにするかにより、変圧器５０の負荷６０への電力供給を断つことなく負荷の電圧調整をおこない、回路１をＯＮ状態からＯＦＦ状態にして、回路２をＯＦＦ状態からＯＮ状態に切替える際に、サイリスタ１０、２０のゲート信号をＯＦＦとし、電圧検出器１０１、２０１の検出電圧が０Ｖとなったときに、前記制御回路がサイリスタのターンオフとして検出・判断して、サイリスタ３０、４０のゲート信号をＯＮにすることを特徴とするサイリスタのターンオフを検出する方法   A circuit 1 in which two thyristors 10 and 20 are connected in antiparallel in a device that adjusts the supply voltage to a load without switching off the power supply to the load by switching the transformer taps using a thyristor. The circuit 2 connected to the tap A of the transformer 50 and another two thyristors 30 and 40 connected in reverse parallel is connected to the tap B of the transformer 50, and the circuit 1 and the circuit 2 include at least one A control circuit is incorporated, and at least one voltage detector 101, 201, 301, 401 is connected between the gate G and the cathode K of each thyristor, and the gate signals of the thyristors 10, 20 of the circuit 1 are turned ON. The voltage of the load is adjusted without interrupting the power supply to the load 60 of the transformer 50, depending on whether the gate signals of the thyristors 30 and 40 of the circuit 2 are turned ON. When switching the circuit 1 from the ON state to the OFF state and switching the circuit 2 from the OFF state to the ON state, the gate signals of the thyristors 10 and 20 are turned OFF, and the detection voltages of the voltage detectors 101 and 201 become 0V. When the control circuit detects and determines that the thyristor is turned off, the gate signal of the thyristors 30 and 40 is turned on, and the thyristor turn-off is detected.
JP2006279605A 2006-10-13 2006-10-13 How to detect thyristor turn-off Expired - Fee Related JP4129276B2 (en)

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