JPS5850109B2 - Secondary current rectification circuit of current transformer - Google Patents
Secondary current rectification circuit of current transformerInfo
- Publication number
- JPS5850109B2 JPS5850109B2 JP593676A JP593676A JPS5850109B2 JP S5850109 B2 JPS5850109 B2 JP S5850109B2 JP 593676 A JP593676 A JP 593676A JP 593676 A JP593676 A JP 593676A JP S5850109 B2 JPS5850109 B2 JP S5850109B2
- Authority
- JP
- Japan
- Prior art keywords
- current
- current transformer
- diode
- transformer
- zener diode
- 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
Landscapes
- Rectifiers (AREA)
- Power Conversion In General (AREA)
Description
【発明の詳細な説明】
本発明はサイリスター変換器等の交流器等の交流電流弁
して検出する回路に係り、電流の極性、電流の有無を示
す状態信号及び電流の大きさを検出するための変流器の
二次電流整流回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit for detecting an alternating current valve of an alternating current converter such as a thyristor converter, and for detecting the polarity of current, a status signal indicating the presence or absence of current, and the magnitude of current. This invention relates to a secondary current rectifier circuit for a current transformer.
変流器の二次電流を全波整流回路を介して検出する方式
は従来広く用いられているが、整流された出力信号によ
って、変流器に通流している電流の極性を知ることは出
来ない。A method of detecting the secondary current of a current transformer via a full-wave rectifier circuit has been widely used, but it is not possible to determine the polarity of the current flowing through the current transformer from the rectified output signal. do not have.
又電流の有無に関する状態信号を作り出すことに関して
、小電流領域で精度を上げることは、整流した出力が小
なるために困難であった。In addition, it has been difficult to increase the accuracy in the small current region in producing a status signal regarding the presence or absence of current because the rectified output is small.
本発明の目的は、変流器に通ずる電流の大きさを検出す
るとともに、電流の極性と、電流の有無の状態信号を精
度良く作り出すことのできる変流器の二次電流整流回路
を提供するにある。An object of the present invention is to provide a secondary current rectifier circuit for a current transformer that can detect the magnitude of the current flowing through the current transformer and also accurately generate the polarity of the current and a status signal indicating the presence or absence of current. It is in.
本発明の特徴は、変成器の二次電流を整流して負荷抵抗
に供給するブリッジ整流回路の隣接する２辺を、ダイオ
ードと、これらダイオードと逆極性のツェナーダイオー
ドとの直列回路とし、負荷抵抗の両端と、これらのツェ
ナーダイオードの両端とをそれぞれ検出出力端としたと
ころにある。A feature of the present invention is that the two adjacent sides of the bridge rectifier circuit that rectifies the secondary current of the transformer and supplies it to the load resistor are connected to a series circuit of diodes and Zener diodes of opposite polarity to the load resistor. and both ends of these Zener diodes are respectively used as detection output terminals.
以下、第１図、第２図により本発明の詳細な説明する。Hereinafter, the present invention will be explained in detail with reference to FIGS. 1 and 2.
第１図は、本発明の実施例の回路図で符号１は変流器、
２〜５はダイオード、６〜７はツェナーダイオード、８
は負荷抵抗を示す。FIG. 1 is a circuit diagram of an embodiment of the present invention, in which reference numeral 1 is a current transformer;
2 to 5 are diodes, 6 to 7 are Zener diodes, 8
indicates load resistance.
変流器の一次電流としてｉｌを通ずれば、これは変流器
の変流比によって定まる変流器二次電流１２に変換され
る。When passed through il as the primary current of the current transformer, it is converted into a current transformer secondary current 12 determined by the current transformation ratio of the current transformer.
１２はダイオード及びツェナーダイオードを介して負荷
抵抗に供給される。12 is supplied to the load resistor via a diode and a Zener diode.
今電流の方向が図示の矢印の如くであれは、Ｉ２は、変
流器より流出して、符号５のダイオードを通り、符号７
のツェナダイオードの有するクリップ電圧に抗してこれ
に導通し、符号８の負荷抵抗から、符号２のダイオード
を通して変流器に戻る。If the current direction is as shown by the arrow in the figure, I2 flows out from the current transformer, passes through the diode numbered 5, and passes through the diode numbered 7.
conducts against the clip voltage of the Zener diode , and returns from the load resistor 8 to the current transformer through the diode 2 .
このとき、符号７のツェナーダイオードの両端には、１
２の大小にかかわらずツェナーダイオードのクリップ電
圧ＥＰが生ずる。At this time, 1
A clip voltage EP of the Zener diode occurs regardless of the magnitude of 2.
符号６のツェナーダイオードには１２は通じていないか
ら、その両端の電圧はＯである。Since 12 is not connected to the Zener diode 6, the voltage across it is O.
符号８の負荷抵抗の両端にはＩ２に比例した電圧ｅを生
ずる。A voltage e proportional to I2 is generated across the load resistor 8.
電流■１が図示の方向に対して反転すると、Ｉ２もその
方向を反転するため、符号４のダイオード、符号６のツ
ェナーダイオード、負荷抵抗及び符号３のダイオードを
通して変流器に戻る。When the current 1 reverses its direction as shown, I2 also reverses its direction, so that it returns to the current transformer through the diode 4, the Zener diode 6, the load resistor, and the diode 3.
このときは、符号６のツェナーダイオードの両端には１
２れ大小にかかわらず、ツェナーダイオードのクリップ
電圧ＥＮが生ずる。At this time, 1
Regardless of the magnitude of 2, a clip voltage EN of the Zener diode is generated.
又符号７のツェナーダイオードには１２は通じていない
から、その両端の電圧は０である。Also, since 12 is not connected to the Zener diode 7, the voltage across it is 0.
符号８の負荷抵抗の両端にはＩ２に比例した電圧ｅを生
ずる。A voltage e proportional to I2 is generated across the load resistor 8.
ｅの極性は、１２の極性には無関係に一定である。The polarity of e is constant regardless of the polarity of 12.
以上の関係を、時間ｔに関して図式的に示すと第２図の
ようになる。The above relationship is diagrammatically shown in FIG. 2 with respect to time t.
ｅは、変流器の電流を絶対値として与える。e gives the current of the current transformer as an absolute value.
又ＥＰは、ｉ２が図示の方向に存在するという状態を示
し、ＥＮはｉ２が図示の方向とは逆方向に存在するとい
う状態を示す。Further, EP indicates a state in which i2 exists in the illustrated direction, and EN indicates a state in which i2 exists in a direction opposite to the illustrated direction.
ＥＰ、ＥＮはツェナーダイオードのクリップ電圧であり
、１２が微少電流であっても、電圧を生ずるから、微少
電流に対しても、電流の有無に関する精度の良い状態信
号を作り出すことができる。EP and EN are the clip voltages of the Zener diode, and even if 12 is a minute current, a voltage is generated. Therefore, even for a minute current, an accurate status signal regarding the presence or absence of current can be generated.
以上の説明のとおり本発明によりサイリスター変換器の
制御に不可欠の電流検出出力を精度よく得ることができ
る。As explained above, according to the present invention, it is possible to accurately obtain a current detection output that is essential for controlling a thyristor converter.
第１図は本発明の実施例の回路図、第２図は第１図の各
部波形図である。
符号の説明、１・・・・・・変流器、２〜５・・・・・
・ダイオード、６，７・・・・・・ツェナーダイオード
、８・・・・・・負荷抵抗。FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a waveform diagram of each part of FIG. 1. Explanation of symbols, 1...Current transformer, 2-5...
・Diode, 6, 7... Zener diode, 8... Load resistance.
Claims (1)
荷抵抗に導く回路において、該ブリッジ整流回路の隣接
する任意の２辺はそれぞれダイオードと、該ダイオード
と逆極性のツェナーダイオードとの直列回路とし、該負
荷抵抗の両端と該ツェナーダイオードの両端をそれぞれ
検出出力端としたことを特徴とする変流器の二次電流整
流回路。1. In a circuit that leads the secondary current of a current transformer to a load resistor via a bridge rectifier circuit, any two adjacent sides of the bridge rectifier circuit are connected in series with a diode and a Zener diode of opposite polarity to the diode. 1. A secondary current rectifier circuit for a current transformer, characterized in that both ends of the load resistor and both ends of the Zener diode serve as detection output terminals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP593676A JPS5850109B2 (en) | 1976-01-23 | 1976-01-23 | Secondary current rectification circuit of current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP593676A JPS5850109B2 (en) | 1976-01-23 | 1976-01-23 | Secondary current rectification circuit of current transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5290032A JPS5290032A (en) | 1977-07-28 |
| JPS5850109B2 true JPS5850109B2 (en) | 1983-11-08 |
Family
ID=11624773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP593676A Expired JPS5850109B2 (en) | 1976-01-23 | 1976-01-23 | Secondary current rectification circuit of current transformer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5850109B2 (en) |
-
1976
- 1976-01-23 JP JP593676A patent/JPS5850109B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5290032A (en) | 1977-07-28 |
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