JPS61218370A - Firing phase controlling method for rectifier circuit - Google Patents

Firing phase controlling method for rectifier circuit

Info

Publication number
JPS61218370A
JPS61218370A JP5845485A JP5845485A JPS61218370A JP S61218370 A JPS61218370 A JP S61218370A JP 5845485 A JP5845485 A JP 5845485A JP 5845485 A JP5845485 A JP 5845485A JP S61218370 A JPS61218370 A JP S61218370A
Authority
JP
Japan
Prior art keywords
thyristor bridge
bridge circuit
firing phase
circuit
stage
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
JP5845485A
Other languages
Japanese (ja)
Inventor
Hideo Sakamoto
英雄 坂本
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP5845485A priority Critical patent/JPS61218370A/en
Publication of JPS61218370A publication Critical patent/JPS61218370A/en
Pending legal-status Critical Current

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
    • H02M7/19—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 arranged for operation in series, e.g. for voltage multiplication

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

PURPOSE:To reduce the variation in a current flowed to a load by exchanging the firing phase angles of two thyristor bridge circuits several times when exchanging the angles of the bridge circuits. CONSTITUTION:An AC power source 1 is connected with the input terminal of a transformer 2, and thyristor bridge circuits 31, 32 are connected with two output terminals of the transformer 2. A load 4 is connected with the output sides of the bridge circuits 31, 32. A capacitor 51 is connected in parallel with the circuit 31 at the output terminal of the transformer 2. When exchanging the firing phase angles of the bridge circuits 31, 32, it is exchanged several times to reduce the variation in a load current.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は整流回路の点弧位相制御方法に係り、特に、複
数のサイリスタブリッジ回路から成る整流回路に好適な
点弧位相制御方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a firing phase control method for a rectifier circuit, and particularly to a firing phase control method suitable for a rectifier circuit comprising a plurality of thyristor bridge circuits.

〔発明の背景〕[Background of the invention]

交流電源から直流負荷へ電力を供給しようとする場合、
整流素子から成るブリッジ回路を用いることが多い。特
に、直流負荷の電流、あるいは、電圧を一定に保つ必要
がある場合、整流素子として点弧位相角の変化できるサ
イリスタを一部に含むサイリスタブリッジ回路を用いる
ことが多い。When trying to supply power from an AC power supply to a DC load,
A bridge circuit consisting of a rectifying element is often used. In particular, when it is necessary to keep the current or voltage of a DC load constant, a thyristor bridge circuit that includes a thyristor whose firing phase angle can be changed as a rectifying element is often used.

さて、サイリスタブリッジ回路で、その点弧位相角を制
御した場合、サイリスタブリッジ回路の電源電流は遅れ
力率となり、力率は低下する。Now, when the firing phase angle of the thyristor bridge circuit is controlled, the power supply current of the thyristor bridge circuit has a delayed power factor, and the power factor decreases.

そこで、第５図に示すような複数段のサイリスタブリッ
ジ回路から成る整流回路が電鉄などに応用されている。Therefore, a rectifier circuit consisting of a multi-stage thyristor bridge circuit as shown in FIG. 5 is applied to electric railways and the like.

この整流装置では、必要とされる整流回路の出力電圧が
低い場合には、第一段目のサイリスタブリッジ回路のみ
点弧し、第二段目のサイリスタブリッジ回路を点弧せず
制御し、出力電圧が高く、第一段目のサイリスタブリッ
ジ回路の出力電圧のみでは電圧が不足する場合に、第二
段目のサイリスタブリッジ回路も点弧して制御すること
により力率の改善が図られる。In this rectifier, when the required output voltage of the rectifier circuit is low, only the first stage thyristor bridge circuit is fired, the second stage thyristor bridge circuit is controlled without firing, and the output When the voltage is high and the output voltage of the first stage thyristor bridge circuit alone is insufficient, the power factor can be improved by controlling the second stage thyristor bridge circuit to also fire.

更に、力率を改善するには、第６図に示すように、サイ
リスタブリッジの交流電源側に力率改善用のコンデンサ
を付加したものがある。しかし、必要とされる整流回路
の出力電圧が高く第一段目のサイリスタブリッジ回路の
出力電圧のみでは電圧が不足する場合には、第一段目の
サイリスタブリッジ回路は全開しており、第一段目のサ
イリスタブリッジ回路の交流電源側に付加されたコンデ
ンサは不必要となる。Furthermore, in order to improve the power factor, as shown in FIG. 6, a power factor improving capacitor is added to the AC power supply side of the thyristor bridge. However, if the required output voltage of the rectifier circuit is high and the output voltage of the first stage thyristor bridge circuit is insufficient, the first stage thyristor bridge circuit is fully open and the first stage thyristor bridge circuit is fully open. The capacitor added to the AC power supply side of the thyristor bridge circuit in the second stage is unnecessary.

そこで、特開昭５６−６８２０１号公報に開示されたよ
うに、第３図において第一段目のサイリスタブリッジ回
路の交流電流側のみに力率改善用のコンデンサを付加し
た構成のものが考えられる。第１図の回路において、第
一段目のサイリスタブリッジ・回路の出力電圧のみでは
電圧が不足する場合、第二段目のサイリスタブリッジ回
路を全開にして、第一段目のサイリスタブリッジ回路の
点弧位相角のみを制御する。すなわち、常に、第一段目
のサイリスタブリッジ回路の点弧位相角のみを制御すれ
ば、力率が改善され、しかも、第６図に示す構成に比ベ
コンデンサの員数を低減することができる。Therefore, as disclosed in Japanese Patent Application Laid-Open No. 56-68201, a configuration in which a capacitor for power factor improvement is added only to the alternating current side of the first stage thyristor bridge circuit in Fig. 3 is considered. . In the circuit shown in Figure 1, if the output voltage of the first stage thyristor bridge circuit is insufficient, the second stage thyristor bridge circuit is fully opened and the first stage thyristor bridge circuit is Controls only the arc phase angle. That is, by always controlling only the firing phase angle of the first stage thyristor bridge circuit, the power factor can be improved and the number of capacitors can be reduced compared to the configuration shown in FIG.

ところで、第１図に示す整流回路で必要とされる整流回
路の出力電圧を低い値から高い値に変化させる場合、第
一段目のサイリスタブリッジ回路が全開し、同時に、第
一段目のサイリスタブリッジ回路が絞られる遷移状態が
存在する。By the way, when changing the output voltage of the rectifier circuit shown in Fig. 1 from a low value to a high value, the first stage thyristor bridge circuit is fully opened, and at the same time, the first stage thyristor bridge circuit is fully opened. There is a transition state in which the bridge circuit is throttled.

この遷移状態を表したのが第２図である。図において、
最初、第一段目のサイリスタブリッジ回路は全開し、第
二段目のサイリスタブリッジ回路は点弧し始めている。FIG. 2 shows this transition state. In the figure,
Initially, the first stage thyristor bridge circuit is fully open, and the second stage thyristor bridge circuit is starting to fire.

次に、時刻ｔ。において。Next, time t. In.

第二段目のサイリスタブリッジ回路は全開し、第一段目
のサイリスタブリッジ回路はその直前の第二口のサイリ
スタブリッジ回路の点弧位相角で点弧する。すなわち、
第一段目のサイリスタブリッジ回路の点弧位相角と第二
段目のサイリスタブリッジ回路の点弧位相角とを交換す
る制御が行なわれる。The second stage thyristor bridge circuit is fully opened, and the first stage thyristor bridge circuit is fired at the firing phase angle of the second stage thyristor bridge circuit immediately before it. That is,
Control is performed to exchange the firing phase angle of the first stage thyristor bridge circuit and the firing phase angle of the second stage thyristor bridge circuit.

ところが、変圧器端子電圧の差、および、第一段目のサ
イリスタブリッジ回路の交流電源側にのみ付加されたコ
ンデンサのために、第一段目のサイリスタブリッジ回路
の交流電源側電圧と第二段目のサイリスタブリッジ回路
の交流電源側電圧とは異なる。従って、前に説明した点
弧位相角の交換の際に、整流回路の出力電圧は急激に変
化する。However, due to the difference in transformer terminal voltage and the capacitor added only to the AC power supply side of the first stage thyristor bridge circuit, the voltage on the AC power supply side of the first stage thyristor bridge circuit and the second stage thyristor bridge circuit are different. This is different from the AC power supply side voltage of the thyristor bridge circuit. Therefore, during the above-described exchange of firing phase angles, the output voltage of the rectifier circuit changes rapidly.

整流回路の出力電圧の急激な変化により、制御回路が応
答するまでの間に、負荷に流れる電流が一時的に大きく
変化するという問題が生じる。A sudden change in the output voltage of the rectifier circuit causes a problem in that the current flowing through the load temporarily changes significantly until the control circuit responds.

〔発明の目的〕[Purpose of the invention]

本発明の目的は、複数のサイリスタブリッジ回路から成
る整流回路において二つのサイリスタブリッジ回路の点
弧位相角を交換する際に発生する負荷に流れる電流れ変
化量を低減した点弧位相制御方法を提供することにある
。An object of the present invention is to provide a firing phase control method that reduces the amount of change in current flowing through a load that occurs when exchanging the firing phase angles of two thyristor bridge circuits in a rectifier circuit consisting of a plurality of thyristor bridge circuits. It's about doing.

一、、、、、、（発明の概要〕 本発明は、二つのサイリスタブリッジ回路の点弧位相角
を交換する際、その交換を複数回行なうことにより、整
流回路の出力電圧が急激に変化することを回避したもの
である。1. (Summary of the Invention) The present invention provides a method for exchanging the firing phase angles of two thyristor bridge circuits multiple times, thereby causing a sudden change in the output voltage of the rectifier circuit. This is to avoid this.

〔発明の実施例〕[Embodiments of the invention]

以下、本発明の一実施例を説明する。 An embodiment of the present invention will be described below.

第１図において、変圧器２の入力端子には交流電源１が
接続され、変圧器２の二つの出力端子にはそれぞれサイ
リスタブリッジ回路３１および、サイリスタブリッジ回
路３２が接続されている。In FIG. 1, an AC power source 1 is connected to an input terminal of a transformer 2, and a thyristor bridge circuit 31 and a thyristor bridge circuit 32 are connected to two output terminals of the transformer 2, respectively.

サイリスタブリッジ回路３１の出力側とサイリスタブリ
ッジ回路３２の出力側とは直列に接続され、その両端は
負荷４に接続されている。変圧器２のサイリスタブリッ
ジ回路３１側の出力端子にはコンデンサ５１がサイリス
タブリッジ回路３１と並列に接続されている。The output side of the thyristor bridge circuit 31 and the output side of the thyristor bridge circuit 32 are connected in series, and both ends thereof are connected to the load 4. A capacitor 51 is connected to the output terminal of the transformer 2 on the thyristor bridge circuit 31 side in parallel with the thyristor bridge circuit 31 .

この整流回路で、必要とされる出力電圧が低い場合は、
サイリスタブリッジ回路３１のみを点弧し、サイリスタ
ブリッジ回路３２は点弧しない。With this rectifier circuit, if the required output voltage is low,
Only the thyristor bridge circuit 31 is fired, and the thyristor bridge circuit 32 is not fired.

次に、必要とされる出力電圧が高くなり、サイリスタブ
リッジ回路３１の出力電圧のみでは電圧が不足する場合
には、第３図に示す遷移状態を経由してサイリスタブリ
ッジ回路３２を全開させ、サイリスタブリッジ回路３１
の点弧位相角を制御することにより、所定の電圧を得る
。Next, when the required output voltage increases and the output voltage of the thyristor bridge circuit 31 is insufficient, the thyristor bridge circuit 32 is fully opened through the transition state shown in FIG. Bridge circuit 31
A predetermined voltage is obtained by controlling the firing phase angle of.

第３図において、最初、第一段目のサイリスタブリッジ
回路３１は全開し、第二段目のサイリスタブリッジ回路
３２は点弧し始めている。次に、時刻ｔ。において、第
二段目のサイリスタブリッジ回路３２は全開し、同時に
第一段目のサイリスタブリッジ回路３１は時刻ｔ。の直
前の第二段目のサイリスタブリッジ回路３２の点弧位相
角で点弧する。すなわち、サイリスタブリッジ回路３１
の点弧位相角とサイリスタブリッジ回路３２とを交換す
る制御が行なわれる。時刻ｔ１でサイリスタブリッジ回
路３１の点弧位相角とサイリスタブリッジ回路３２の点
弧位相角が交換され、以下、時刻ｔ、１時刻時刻１時１
時刻において、それぞれ、二つのサイリスタブリッジ回
路の点弧位相角が交換され、最後に、サイリスタブリッ
ジ回路３２は全開し、サイリスタブリッジ回路３１の点
弧位相角は所定の出力電圧が得られるように制御される
。　この時刻ｔ。から時刻ｔ４の間に整流回路の出力電
圧は変化するが、同時に制御回路も応答するので、−回
の点弧位相角の交換による方式に比べ、負荷電流の変化
量は小さくなる。In FIG. 3, first stage thyristor bridge circuit 31 is fully open, and second stage thyristor bridge circuit 32 is starting to fire. Next, time t. At time t, the second stage thyristor bridge circuit 32 is fully opened, and at the same time, the first stage thyristor bridge circuit 31 is fully opened. It fires at the firing phase angle of the second stage thyristor bridge circuit 32 immediately before. That is, the thyristor bridge circuit 31
Control is performed to exchange the firing phase angle of the thyristor bridge circuit 32. At time t1, the firing phase angle of the thyristor bridge circuit 31 and the firing phase angle of the thyristor bridge circuit 32 are exchanged, and henceforth, time t, 1 time 1:01
At the same time, the firing phase angles of the two thyristor bridge circuits are exchanged, and finally, the thyristor bridge circuit 32 is fully opened, and the firing phase angle of the thyristor bridge circuit 31 is controlled so that a predetermined output voltage is obtained. be done. This time t. Although the output voltage of the rectifier circuit changes between the time t4 and the time t4, the control circuit also responds at the same time, so the amount of change in the load current becomes smaller than in the method of exchanging the firing phase angle - times.

第４図は、本発明の他の実施例を示す。第一段目のサイ
リスタブリッジ回路３１が全開する以前の点弧位相角で
、第二段目のサイリスタブリッジ回路３２の点弧を開始
する点弧制御方式に、本発明を適用したものである。本
実施例によれば、更に、整流回路の出力電圧が第一段目
のサイリスタブリッジ回路の全開時の出力電圧に近い値
にある場合、二つのサイリスタブリッジでの円滑な渡り
が行なわれる。FIG. 4 shows another embodiment of the invention. The present invention is applied to a firing control method in which firing of the second stage thyristor bridge circuit 32 is started at a firing phase angle before the first stage thyristor bridge circuit 31 is fully opened. According to this embodiment, furthermore, when the output voltage of the rectifier circuit is close to the output voltage of the first stage thyristor bridge circuit when it is fully open, a smooth transition occurs between the two thyristor bridges.

なお、図中２は変圧器、４は負荷、５１．５２はコンデ
ンサである。In the figure, 2 is a transformer, 4 is a load, and 51.52 is a capacitor.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、点弧位相角の交換が複数回行なわれ、
制御回路が応答する時間が確保されるので、負荷に流れ
る電流の変化量を低減することができ、円滑な負荷制御
を行なうことができる。According to the invention, the firing phase angle is exchanged multiple times,
Since time for the control circuit to respond is secured, the amount of change in the current flowing through the load can be reduced, and smooth load control can be performed.

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

第１図は本発明を適用する実施例の回路図、第２図は従
来例を説明するタイミング図、第３図は本発明のタイミ
ング図、第４図は本発明の他の実施例のタイミング図、
第５図、第６図は従来例を説明する回路図である。 １・・・交流電源、２・・・変圧器、３１．．３２・・
・サイリスタブリッジ回路、４・・・負荷、５１．５２
・・・コンデンサ。Fig. 1 is a circuit diagram of an embodiment to which the present invention is applied, Fig. 2 is a timing diagram explaining a conventional example, Fig. 3 is a timing diagram of the present invention, and Fig. 4 is a timing diagram of another embodiment of the present invention. figure,
FIGS. 5 and 6 are circuit diagrams illustrating a conventional example. 1... AC power supply, 2... Transformer, 31. ．． 32...
・Thyristor bridge circuit, 4...Load, 51.52
...Capacitor.

Claims (1)

【特許請求の範囲】 １、複数のサイリスタブリッジ回路から成る整流回路に
おいて、 あるサイリスタブリッジ回路の点弧位相角と他のサイリ
スタブリッジ回路の点弧位相角とを交換する時に、前記
点弧位相角の交換を複数回行なうことを特徴とする整流
回路の点弧位相制御方法。[Claims] 1. In a rectifier circuit consisting of a plurality of thyristor bridge circuits, when exchanging the firing phase angle of one thyristor bridge circuit with the firing phase angle of another thyristor bridge circuit, the firing phase angle A method for controlling the ignition phase of a rectifier circuit, characterized in that the ignition phase of the rectifier circuit is replaced multiple times.
JP5845485A 1985-03-25 1985-03-25 Firing phase controlling method for rectifier circuit Pending JPS61218370A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5845485A JPS61218370A (en) 1985-03-25 1985-03-25 Firing phase controlling method for rectifier circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5845485A JPS61218370A (en) 1985-03-25 1985-03-25 Firing phase controlling method for rectifier circuit

Publications (1)

Publication Number Publication Date
JPS61218370A true JPS61218370A (en) 1986-09-27

Family

ID=13084868

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5845485A Pending JPS61218370A (en) 1985-03-25 1985-03-25 Firing phase controlling method for rectifier circuit

Country Status (1)

Country Link
JP (1) JPS61218370A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0622974B1 (en) * 1993-04-30 1999-09-29 Cegelec Metals Systems Method for use in a rectifier for powering a DC arc furnace

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0622974B1 (en) * 1993-04-30 1999-09-29 Cegelec Metals Systems Method for use in a rectifier for powering a DC arc furnace

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