JPS6129228B2 - - Google Patents
Info
- Publication number
- JPS6129228B2 JPS6129228B2 JP54116196A JP11619679A JPS6129228B2 JP S6129228 B2 JPS6129228 B2 JP S6129228B2 JP 54116196 A JP54116196 A JP 54116196A JP 11619679 A JP11619679 A JP 11619679A JP S6129228 B2 JPS6129228 B2 JP S6129228B2
- Authority
- JP
- Japan
- Prior art keywords
- current
- thyristor
- capacitor
- conversion circuit
- resistor
- 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.)
- Expired
Links
Classifications
-
- 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
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/145—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/155—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Description
【発明の詳細な説明】
本発明は電流検出装置に係り、特に交流電源に
よつて駆動され、負荷に直流電力を供給するサイ
リスタ直流変換回路の負荷電流を検出する簡易形
の電流検出装置の改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a current detection device, and in particular to an improvement of a simple current detection device that detects the load current of a thyristor DC conversion circuit that is driven by an AC power source and supplies DC power to a load. It is related to.
サイリスタ直流変換回路の直流側電流を検出
し、これを制御用または指示用に利用することが
多い。ところで、交流電源電圧が高い場合には、
出力電流を絶縁して直流側電流を検出しなければ
ならないので、従来は第１図に示す回路の電流検
出装置が用いられていた。 The DC side current of a thyristor DC conversion circuit is often detected and used for control or instruction purposes. By the way, when the AC power supply voltage is high,
Since it is necessary to detect the DC side current while insulating the output current, a current detection device having the circuit shown in FIG. 1 has conventionally been used.
第１図において、１，２は交流電源端子、３は
抵抗、４はコンデンサで、これらでサージアブソ
ーバを構成している。５はサイリスタ５ａ〜５ｄ
からなるサイリスタ直流変換回路、６は電流検出
装置、７は負荷で、サイリスタ５ａ〜５ｄは、図
示しない一般的な移相器からゲート信号を与える
ことによつて制御され、直流出力電流Ｉdを得る
ようになつている。なお、サージアブソーバは、
サイリスタ５ａ〜５ｄに過電圧が印加されるのを
防止するためのものである。電流検出走置６は、
良く知られた回路構成になつている。すなわち、
鉄心８には出力巻線９が巻かれており、その巻き
終りに帰還抵抗１２の一端とダイオード１３のア
ノードが接続され、巻き始め端（・印）にはダイ
オード１４のアノードと負荷抵抗１７の一端が接
続されている。また、鉄心１０には出力巻線１１
が巻かれており、その巻き始め端（・印）には帰
還抵抗１２の他の一端とダイオード１５のカソー
ドが接続され、巻き終りにダイオード１６のカソ
ードと負荷抵抗１７の他の一端が接続されてい
る。そして、交流電源１８の一端にダイオード１
３のカソードとダイオード１５のアノードが接続
され、交流電源１８の他の一端にダイオード１４
のカソードとダイオード１６のアノードが接続さ
れている。さらに、鉄心８に制御巻線１９が、鉄
心１０に制御巻線２０が巻かれており、制御巻線
１９と２０とは直列に接続されている。なお、巻
線１９，２０の・印は極性を示す。 In FIG. 1, 1 and 2 are AC power supply terminals, 3 is a resistor, and 4 is a capacitor, which constitute a surge absorber. 5 is thyristor 5a to 5d
6 is a current detection device, 7 is a load, and the thyristors 5a to 5d are controlled by applying a gate signal from a general phase shifter (not shown) to control the DC output current Id . I'm starting to get it. In addition, the surge absorber is
This is to prevent overvoltage from being applied to the thyristors 5a to 5d. The current detection position 6 is
It has a well-known circuit configuration. That is,
An output winding 9 is wound around the iron core 8. One end of the feedback resistor 12 and the anode of the diode 13 are connected to the end of the winding, and the anode of the diode 14 and the anode of the load resistor 17 are connected to the beginning of the winding (marked with a *). One end is connected. In addition, the output winding 11 is attached to the iron core 10.
is wound, and the other end of the feedback resistor 12 and the cathode of the diode 15 are connected to the winding start end (marked with *), and the cathode of the diode 16 and the other end of the load resistor 17 are connected to the winding end. ing. A diode 1 is connected to one end of the AC power supply 18.
The cathode of 3 and the anode of the diode 15 are connected, and the diode 14 is connected to the other end of the AC power supply 18.
The cathode of the diode 16 is connected to the anode of the diode 16. Further, a control winding 19 is wound around the iron core 8, a control winding 20 is wound around the iron core 10, and the control windings 19 and 20 are connected in series. Note that the marks on the windings 19 and 20 indicate polarity.
このような構成において、制御巻線１９，２０
に矢印方向に制御電流（出力電流Ｉd）を流した
とき、制御巻線１９，２０と出力巻線９，１１の
間の変流器作用により、負荷抵抗１７の両端に、
これにほぼ比例した電圧が発生することが知られ
ている。しかも、制御電流の変化に対して出力電
圧がほとんど時間遅れなく変化するので、瞬時値
検出の目的に好適である。しかし、この電流検出
装置６には、交流電源１８が必要であり、かつ、
回路構成が複雑で、高価であるという欠点があ
る。 In such a configuration, the control windings 19, 20
When a control current (output current I d ) is caused to flow in the direction of the arrow, due to the current transformer action between the control windings 19 and 20 and the output windings 9 and 11, the voltage across the load resistor 17 is
It is known that a voltage approximately proportional to this is generated. Moreover, since the output voltage changes with almost no time delay in response to changes in the control current, it is suitable for the purpose of instantaneous value detection. However, this current detection device 6 requires an AC power supply 18, and
The drawbacks are that the circuit configuration is complex and expensive.
本発明は上記に鑑みてなされたもので、その目
的とするところは、検出点をサイリスタ直流変換
回路の交流側に設けられ、かつ簡単な構成でもつ
て高精度の電流検出装置を提供することにある。 The present invention has been made in view of the above, and its purpose is to provide a highly accurate current detection device with a simple configuration and a detection point provided on the AC side of a thyristor DC conversion circuit. be.
本発明の特徴は、交流側に抵抗とコンデンサか
らなるサージアブソーバが接続されたサイリスタ
直流変換回路のサージアブソーバとサイリスタ直
流変換回路の間に配設した鉄心とこの鉄心に巻装
された１次巻線および２次巻線とからなる変流器
と、この変流器の２次巻線に接続した抵抗とコン
デンサの直列回路とで電流検出装置を構成した点
にある。 The present invention is characterized by an iron core disposed between the surge absorber and the thyristor DC conversion circuit of a thyristor DC conversion circuit in which a surge absorber consisting of a resistor and a capacitor is connected to the AC side, and a primary winding wound around this iron core. A current detection device is constructed of a current transformer including a wire and a secondary winding, and a series circuit of a resistor and a capacitor connected to the secondary winding of the current transformer.
以下本発明を第２図に示した実施例および第３
図、第４図を用いて詳細に説明する。 The embodiment of the present invention shown in FIG. 2 and the third embodiment will be described below.
This will be explained in detail using FIG.
第２図は本発明の電流検出装置の一実施例を示
す回路図で、サイリスタ直流変換回路に実装した
状態を示してあり、第１図と同一部分は同じ符号
で示し、説明を省略する。第２図において、２１
は変流器で、変流器２１は、鉄心２２、鉄心２２
に巻装した１次巻線２３、２次巻線２４とよりな
り、２次巻線２４には、負荷抵抗２５を接続する
とともに、抵抗２６とコンデンサ２７との直列回
路を接続してある。なお、１次巻線２３は、抵抗
３とコンデンサ４からなるサージアブソーバとサ
イリスタ直流変換回路５（サイリスタ５ａ〜５ｄ
よりなる。）との間に接続してある。そして、変
流器２１と抵抗２６、コンデンサ２７との直流回
路および負荷抵抗２５とより、本発明の電流検出
装置を構成してある。 FIG. 2 is a circuit diagram showing one embodiment of the current detection device of the present invention, and shows a state where it is mounted in a thyristor DC conversion circuit. The same parts as in FIG. In Figure 2, 21
is a current transformer, and the current transformer 21 includes an iron core 22 and an iron core 22.
It consists of a primary winding 23 and a secondary winding 24, which are wound around a primary winding 23 and a secondary winding 24.A load resistor 25 is connected to the secondary winding 24, and a series circuit of a resistor 26 and a capacitor 27 is connected to the secondary winding 24. The primary winding 23 includes a surge absorber consisting of a resistor 3 and a capacitor 4, and a thyristor DC conversion circuit 5 (thyristors 5a to 5d).
It becomes more. ). A DC circuit including the current transformer 21, the resistor 26, and the capacitor 27, and the load resistor 25 constitute the current detection device of the present invention.
サイリスタ直流変換回路５において、例えば、
サージアブソーバがない場合には、交流側電流を
全波整流した値と直流側電流とが原理上同一であ
る。したがつて、負荷電流Ｉdを検出するかわり
に、交流側電流を検出するようにしてもよい。と
ころが、交流側に図示したように抵抗３とコンデ
ンサ４よりなるサージアブソーバがある場合は、
交流側電流の一部がサージアブソーバを通して流
れるので、交流側電流と直流側電流とが一致しな
い。すなわち、第２図のＡ点における電流は、直
流側電流と電源端子１，２からサージアブソーバ
に流れる電流との和となるから、例えば、Ｉd＝
０であつても、Ａ点に電流が流れることになり、
Ａ点で電流検出を行うと、直流側電流Ｉdに対す
る検出電流を全波整流した電圧Ｖpの関係が第３
図に示すようになり、好ましくない。 In the thyristor DC conversion circuit 5, for example,
When there is no surge absorber, the value obtained by full-wave rectification of the AC side current and the DC side current are in principle the same. Therefore, instead of detecting the load current I d , the AC side current may be detected. However, if there is a surge absorber consisting of a resistor 3 and a capacitor 4 on the AC side as shown in the figure,
Since a portion of the AC current flows through the surge absorber, the AC current and the DC current do not match. That is, since the current at point A in FIG. 2 is the sum of the DC side current and the current flowing from the power supply terminals 1 and 2 to the surge absorber, for example, I d =
Even if it is 0, current will flow to point A,
When current is detected at point A, the relationship between the DC side current I d and the voltage V p obtained by full-wave rectification of the detected current is the third
This is not desirable as shown in the figure.
とろで、第２図に示した本発明のように、電流
検出点をサージアブソーバとサイリスタ直流変換
回路５との間にすると、交流電源端子１，２から
サージアブソーバに流れる電流分を検出しないよ
うにできる。しかし、サイリスタ５ａ〜５ｄが転
流時、例えば、サイリスタ５ｂと５ｃが導通して
いるときに、サイリスタ５ａと５ｄに点弧パルス
が与えられると、サイリスタ５ａと５ｄが導通に
なり、コンデンサ４に蓄積されていた電圧が、コ
ンデンサ４―サイリススタ５ｂ（または５ｄ）―
サイリスタ５ａ（または５ｃ）―抵抗３―コンデ
ンサ４の電路によつて放電され、パルス状電流が
直流側電流に加算される。したがつて、このまま
では、直流側電流を検出したことにならない。そ
こで、本発明においては、コンデンサ４からの放
電電流を変流器２１で検出して得られた電圧を吸
収するようにするため、２次巻線２４に抵抗２６
とコンデンサ２７との直列回路を接続した。これ
によつて、コンデンサ４の放電にもとずくパルス
状の検出電圧が吸収され、図示しない変流器２１
の出力回路に得られる全波整流された出力電圧
は、第４図に示すように、直流側電流Ｉdに完全
に比例したものとなる。 By the way, when the current detection point is placed between the surge absorber and the thyristor DC conversion circuit 5 as in the present invention shown in FIG. 2, the current flowing from the AC power supply terminals 1 and 2 to the surge absorber is not detected. Can be done. However, when thyristors 5a to 5d are commutating, for example, when thyristors 5b and 5c are conducting, if a firing pulse is given to thyristors 5a and 5d, thyristors 5a and 5d become conducting, and capacitor 4 The accumulated voltage is transferred to capacitor 4 - thyristor 5b (or 5d) -
It is discharged through the thyristor 5a (or 5c)-resistor 3-capacitor 4 electrical path, and the pulsed current is added to the DC side current. Therefore, in this state, it does not mean that the DC side current has been detected. Therefore, in the present invention, in order to absorb the voltage obtained by detecting the discharge current from the capacitor 4 with the current transformer 21, a resistor 26 is installed in the secondary winding 24.
A series circuit of the capacitor 27 and the capacitor 27 was connected. As a result, the pulsed detection voltage based on the discharge of the capacitor 4 is absorbed, and the current transformer 21 (not shown)
The full-wave rectified output voltage obtained from the output circuit is completely proportional to the DC side current I d as shown in FIG.
上記したように、本発明の実施例によれば、サ
イリスタ直流変換回路５の出力直流電流に完全に
比例した出力電圧を変換器２１の出力回路から取
り出すことができ、しかも、回路構成は従来のも
のに比較して簡単なものとすることができる。し
かも、変流器２１を用いているから、高い絶縁状
態で電流検出ができる。 As described above, according to the embodiment of the present invention, an output voltage completely proportional to the output DC current of the thyristor DC conversion circuit 5 can be extracted from the output circuit of the converter 21, and the circuit configuration is different from that of the conventional one. It can be made simple compared to other things. Moreover, since the current transformer 21 is used, current can be detected in a highly insulated state.
なお、上記の説明では、サイリスタ直流変換回
路５を出力電流Ｉdが一方向性のものとして説明
したが、サイリスタ直流変換回路５が逆接続され
ていて出力電流が正負両方向のものとなる場合で
あつても、本発明の電流検出装置を用いることが
できる。ただし、この場合は、電流検出を交流側
で行つているので、サイリスタ直流変換回路５の
出力電流の極性を判断することができない。した
がつて、電流検出装置の出力をサイリスタ直流変
換回路５の正逆を切り換える電流指令とする場合
および出力電流の極性を必要としない場合に本発
明の電流検出装置を採用できる。 Note that in the above explanation, the thyristor DC conversion circuit 5 has been described assuming that the output current I d is unidirectional. Even in such cases, the current detection device of the present invention can be used. However, in this case, since current detection is performed on the AC side, the polarity of the output current of the thyristor DC conversion circuit 5 cannot be determined. Therefore, the current detection device of the present invention can be employed when the output of the current detection device is used as a current command for switching the thyristor DC conversion circuit 5 between forward and reverse directions, and when the polarity of the output current is not required.
以上説明したように、本発明によれば、サイリ
スタ直流変換回路の直流出力電流を交流側高精度
の検出でき、しかも、回路構成を簡単にできると
いう効果がある。 As explained above, according to the present invention, the DC output current of the thyristor DC conversion circuit can be detected with high accuracy on the AC side, and the circuit configuration can be simplified.
第１図は従来の電流検出装置を備えたサイリス
タ直流変換回路の回路図、第２図は本発明の電流
検出装置の一実施例を示す回路図、第３図、第４
図は本発明の装置の動作を説明するための特性線
図である。
１，２……交流電源端子、３……抵抗、４……
コンデンサ、５……サイリスタ直流変換回路、５
ａ〜５ｄ……サイリスタ、７……負荷、２１……
変流器、２２……鉄心、２３……１次巻線、２４
……２次巻線、２５……負荷抵抗、２６……抵
抗、２７……コンデンサ。
Fig. 1 is a circuit diagram of a thyristor DC conversion circuit equipped with a conventional current detection device, Fig. 2 is a circuit diagram showing an embodiment of the current detection device of the present invention, Figs.
The figure is a characteristic diagram for explaining the operation of the device of the present invention. 1, 2... AC power supply terminal, 3... Resistor, 4...
Capacitor, 5... Thyristor DC conversion circuit, 5
a to 5d...Thyristor, 7...Load, 21...
Current transformer, 22... Iron core, 23... Primary winding, 24
...Secondary winding, 25...Load resistance, 26...Resistor, 27...Capacitor.
Claims (1)
ブソーバが接続されたサイリスタ直流変換回路に
用いる電流検出装置において、鉄心に巻装された
１次巻線および２次巻線から成る変流器と、前記
サージアブソーバとサイリスタ直流変換回路との
間に前記変流器の１次巻線を挿入し、当該変流器
の２次巻線側に、前記変換回路の転流時に前記コ
ンデンサからの放電電流によつて発生する電圧を
吸収する抵抗とコデンサの直列回路を接続したこ
とを特徴とする電流検出装置。1 In a current detection device used in a thyristor DC conversion circuit in which a surge absorber consisting of a resistor and a capacitor is connected to the alternating current side, a current transformer consisting of a primary winding and a secondary winding wound around an iron core, The primary winding of the current transformer is inserted between the absorber and the thyristor DC conversion circuit, and the secondary winding side of the current transformer is supplied with a current discharged from the capacitor during commutation of the conversion circuit. A current detection device characterized by connecting a series circuit of a resistor and a capacitor to absorb the voltage generated by the current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11619679A JPS5641772A (en) | 1979-09-12 | 1979-09-12 | Current detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11619679A JPS5641772A (en) | 1979-09-12 | 1979-09-12 | Current detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5641772A JPS5641772A (en) | 1981-04-18 |
| JPS6129228B2 true JPS6129228B2 (en) | 1986-07-05 |
Family
ID=14681207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11619679A Granted JPS5641772A (en) | 1979-09-12 | 1979-09-12 | Current detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5641772A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01126168A (en) * | 1987-11-07 | 1989-05-18 | Mitsubishi Electric Corp | Current detection circuit of thyristor converter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5010276U (en) * | 1973-05-25 | 1975-02-01 | ||
| JPS5291129A (en) * | 1976-01-26 | 1977-08-01 | Hitachi Ltd | Protecting circuit for thyristor converter |
-
1979
- 1979-09-12 JP JP11619679A patent/JPS5641772A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5641772A (en) | 1981-04-18 |
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