JPH0741226Y2 - Light current transformer - Google Patents
Light current transformerInfo
- Publication number
- JPH0741226Y2 JPH0741226Y2 JP1989053710U JP5371089U JPH0741226Y2 JP H0741226 Y2 JPH0741226 Y2 JP H0741226Y2 JP 1989053710 U JP1989053710 U JP 1989053710U JP 5371089 U JP5371089 U JP 5371089U JP H0741226 Y2 JPH0741226 Y2 JP H0741226Y2
- Authority
- JP
- Japan
- Prior art keywords
- optical
- pulse signal
- current transformer
- output
- pulse
- 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.)
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- Optical Communication System (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Transformers For Measuring Instruments (AREA)
Description
【考案の詳細な説明】 ［産業上の利用分野］ 本考案は、変流器の二次側出力を光信号に変換し、該光
信号を光伝送路に伝送する光変流器に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an optical current transformer that converts a secondary output of a current transformer into an optical signal and transmits the optical signal to an optical transmission line. is there.
［従来の技術］ 第７図は従来の光変流器の構成の一例を示している。同
図において、L2は変流器の二次巻線であり、R1は電流調
整用抵抗、R2は負荷抵抗である。LED1は、二次巻線L2の
一方の極性の半波で発光してアナログの光信号を光伝送
路OF1に出力する第１の発光ダイオードであり、LED2は
二次巻線L2の他方の極性の半波で発光してアナログの光
信号を光伝送路OF2に出力する第２の発光ダイオードで
ある。[Prior Art] FIG. 7 shows an example of the configuration of a conventional optical current transformer. In the figure, L2 is a secondary winding of the current transformer, R1 is a current adjusting resistor, and R2 is a load resistor. LED1 is the first light emitting diode that emits an analog optical signal to the optical transmission line OF1 by emitting a half-wave of one polarity of the secondary winding L2, and LED2 is the other polarity of the secondary winding L2. Is a second light emitting diode that emits a half wave of and outputs an analog optical signal to the optical transmission line OF2.
［考案が解決しようとする課題］ 従来の光変流器では、変流器の二次巻線L2の出力の変化
に応じてアナログの光信号を出力しているため、光伝送
路の経年変化に基く伝送路中の抵抗ロスの増加によって
光信号が減衰すると、受信側で正確に測定を行うことが
できない。また発光ダイオード等の発光手段の発光量
は、周囲温度に影響を受けて変化するため、正確に変流
器の二次出力を光信号に変換することができない。更
に、従来は二次巻線の一方の半波と他方の半波の出力
を、２つの発光手段を用いてそれぞれ光信号に変換して
いたため、高価な発光手段及び光伝送路が２個づつ必要
となり、価格の低減化の障害になっていた。[Problems to be solved by the invention] In the conventional optical current transformer, since the analog optical signal is output according to the change in the output of the secondary winding L2 of the current transformer, the secular change of the optical transmission line. If the optical signal is attenuated due to the increase of resistance loss in the transmission line based on the above, it is impossible to perform accurate measurement on the receiving side. Further, the amount of light emitted by the light emitting means such as a light emitting diode changes due to the influence of ambient temperature, so that the secondary output of the current transformer cannot be accurately converted into an optical signal. Further, conventionally, the outputs of one half-wave and the other half-wave of the secondary winding are converted into optical signals by using two light emitting means, respectively, so that two expensive light emitting means and two optical transmission lines are provided. It became necessary and was an obstacle to price reduction.
本考案の目的は、光伝送路の経年変化や発光手段の温度
特性に影響を受けない光信号を出力することができる光
変流器を提供することにある。An object of the present invention is to provide an optical current transformer capable of outputting an optical signal that is not affected by the secular change of the optical transmission line or the temperature characteristic of the light emitting means.
本考案の他の目的は、１個の発光手段を用いて光伝送路
の経年変化や発光手段の温度特性に影響を受けない光信
号を出力することができる光変流器を提供することにあ
る。Another object of the present invention is to provide an optical current transformer that can output an optical signal that is not affected by the secular change of the optical transmission line or the temperature characteristic of the light emitting means by using one light emitting means. is there.
本考案の更に他の目的は、１個の発光手段を用いて光信
号を出力する場合に、変流器の出力の極性の変化を明確
に表示できる光変流器を提供することにある。Still another object of the present invention is to provide an optical current transformer which can clearly display a change in the polarity of the output of the current transformer when an optical signal is output using one light emitting means.
［課題を解決するための手段］ 上記課題を解決するために、本考案は、変流器の二次側
出力を光信号に変換し、該光信号を光伝送路に出力する
光変流器において、変流器の二次側出力をいわゆるデジ
タル化した光信号に変換する。そのために請求項１項の
考案では、二次側出力の一方の極性の半波を入力として
該半波の振幅の変化に対応して周期が変化する複数のパ
ルス信号を発生する第１のパルス信号発生回路と、二次
側出力の他方の極性の半波を入力として該半波の振幅の
変化に対応して周期が変化する複数のパルス信号を発生
する第２のパルス信号発生回路とを設け、両パルス信号
発生回路から出力されるパルス信号によって１つの発光
手段を点滅させて光信号を発生するようにした。[Means for Solving the Problems] In order to solve the above problems, the present invention provides an optical current transformer that converts a secondary output of a current transformer into an optical signal and outputs the optical signal to an optical transmission line. At, the secondary side output of the current transformer is converted into a so-called digitized optical signal. Therefore, in the device according to claim 1, the first pulse for generating a plurality of pulse signals whose half-wave of one polarity of the secondary side output is input and whose period changes corresponding to the change of the amplitude of the half-wave. A signal generating circuit and a second pulse signal generating circuit which receives a half-wave of the other polarity of the secondary side output as an input and generates a plurality of pulse signals whose cycles change in response to changes in the amplitude of the half-wave. One light emitting means is caused to blink by a pulse signal output from both pulse signal generating circuits to generate an optical signal.
請求項２の考案では、変流器の二次側出力の各半波の極
性を識別できるように、第１のパルス信号発生回路から
出力されるパルス信号の振幅と第２のパルス信号発生回
路から出力されるパルス信号の振幅とに差を設けてい
る。According to the second aspect of the present invention, the amplitude of the pulse signal output from the first pulse signal generating circuit and the second pulse signal generating circuit so that the polarity of each half-wave of the secondary side output of the current transformer can be identified. There is a difference in the amplitude of the pulse signal output from the.
請求項３の考案では、二次側出力のゼロクロスポイント
を検出して、識別可能なゼロクロスパルス信号を発光手
段に供給するゼロクロスパルス信号発生回路を設ける。According to the third aspect of the invention, a zero-cross pulse signal generating circuit is provided for detecting the zero-cross point of the secondary side output and supplying a distinguishable zero-cross pulse signal to the light emitting means.
請求項４の考案では、請求項１の考案と同様にデジタル
化した光信号を出力するが、従来と同様に２つの発光手
段を用いて光信号を出力する。そのために、第１のパル
ス信号発生回路及び第２のパルス信号発生回路にそれぞ
れ対応させて第１及び第２の発光手段を設けている。According to the fourth aspect of the invention, the digitized optical signal is output as in the first aspect of the invention, but the optical signal is output using two light emitting means as in the conventional case. Therefore, the first and second light emitting means are provided corresponding to the first pulse signal generating circuit and the second pulse signal generating circuit, respectively.
［作用］ 第１及び第２のパルス信号発生回路は、それぞれ一方の
極性の半波を入力として該半波の振幅の変化に対応して
周期が変化する複数のパルス信号を発生する。このパル
ス信号は、アナログ信号である半波をデジタル化するも
のであり、受信側ではデジタル化された光信号に基いて
適宜のデジタル処理により光変流器の二次側出力の変化
を検知する。光信号をデジタル化すれば、発光量が減衰
しても確実に情報を伝達することができる。[Operation] Each of the first and second pulse signal generation circuits receives a half wave of one polarity as an input and generates a plurality of pulse signals whose cycle changes in response to a change in the amplitude of the half wave. This pulse signal digitizes the half wave that is an analog signal, and the receiving side detects the change in the secondary side output of the optical current transformer by appropriate digital processing based on the digitized optical signal. . If the optical signal is digitized, information can be surely transmitted even if the light emission amount is attenuated.
よって本考案によれば、第１及び第２のパルス信号発生
回路により、変流器の二次側出力の各半波を、各半波の
振幅の変化に対応して周期が変化する複数のパルス信号
に変換してデジタル化するようにしたので、光伝送路の
経年変化及び発光手段の温度特性により発光量が減衰し
ても、変流器の二次側出力の情報を受信側で正確に検知
することができる。Therefore, according to the present invention, by the first and second pulse signal generating circuits, each half wave of the secondary side output of the current transformer is changed into a plurality of cycles in which the cycle changes corresponding to the change of the amplitude of each half wave. Since it is converted into a pulse signal and digitized, even if the amount of light emission is attenuated due to the secular change of the optical transmission line and the temperature characteristic of the light emitting means, the information of the secondary side output of the current transformer will be accurate on the receiving side. Can be detected.
特に請求項１に記載の考案では、第１及び第２のパルス
信号発生回路に対して１つの発光手段を設け、１つの発
光手段で光信号を出力するようにしているので、少ない
部品点数で変流器を構成できる。Particularly, in the device according to the first aspect, one light emitting means is provided for the first and second pulse signal generating circuits, and the light signal is output by one light emitting means, so that the number of parts is small. A current transformer can be configured.
また請求項２に記載の考案では、第１及び第２のパルス
信号発生回路から出力されるパルス信号の振幅に差を設
けるため、パルス列からなる光信号の振幅の大小から、
変流器の二次側出力の各半波の極性を、受信側で簡単に
判別することができる。According to the second aspect of the invention, since the amplitudes of the pulse signals output from the first and second pulse signal generation circuits are made different, the amplitude of the optical signal composed of the pulse train is changed to
The polarity of each half-wave of the secondary side output of the current transformer can be easily discriminated on the receiving side.
更に請求項３に記載の考案によれば、ゼロクロスパルス
信号を発生させてパルス列からなる光信号中に二次側出
力の半波が切替わる点を表示する光パルス信号を含ませ
ることができる。そのため受信側でのデジタル処理が容
易になる利点がある。Further, according to the third aspect of the invention, it is possible to generate a zero-cross pulse signal and include an optical pulse signal indicating a point at which the half wave of the secondary output is switched in the optical signal composed of the pulse train. Therefore, there is an advantage that digital processing on the receiving side becomes easy.
［実施例］ 以下図面を参照して、本考案の実施例を詳細に説明す
る。Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings.
第１図（Ａ）は、請求項１項の考案の基本構成の概略図
を示している。同図においてL2は変流器の二次巻線、D1
〜D4はダイオード、PG1及びPG2は第１及び第２のパルス
信号発生回路、LEDは発光手段としての発光ダイオー
ド、OFは光フィバケーブルからなる光伝送路である。二
次巻線L2に誘起された実線矢印方向の半波の出力はダイ
オードD1から第１のパルス信号発生回路PG1に入力され
る。第１のパルス信号発生回路PG1は、入力された半波
の振幅の変化に対応して周期が変化する複数のパルス信
号を出力する。発光ダイオードLEDは、パルス信号発生
回路PG1から出力されるパルス信号により駆動されて発
光点滅し、パルス列からなる光信号を光伝送路OFに伝送
する。二次巻線L2に破線矢印方向の半波が出力される
と、ダイオードD3を通して第２のパルス信号発生回路PG
2にこの半波が入力されて、同様に発光ダイオードLEDが
点滅する。FIG. 1 (A) shows a schematic view of the basic configuration of the invention of claim 1. In the figure, L2 is the secondary winding of the current transformer, D1
D4 is a diode, PG1 and PG2 are first and second pulse signal generation circuits, LED is a light emitting diode as a light emitting means, and OF is an optical transmission line composed of an optical fiber cable. The output of the half wave in the direction of the solid arrow induced in the secondary winding L2 is input from the diode D1 to the first pulse signal generation circuit PG1. The first pulse signal generation circuit PG1 outputs a plurality of pulse signals whose cycle changes in response to changes in the amplitude of the input half wave. The light emitting diode LED is driven by a pulse signal output from the pulse signal generation circuit PG1 to emit and blink light, and transmits an optical signal composed of a pulse train to the optical transmission line OF. When a half wave in the direction of the dashed arrow is output to the secondary winding L2, the second pulse signal generation circuit PG is passed through the diode D3.
This half wave is input to 2, and the light emitting diode LED blinks in the same manner.
第２図は、パルス信号発生回路PG1及びPG2でアナログ信
号をデジタル信号化する回路の一例の基本原理回路図を
示している。この回路は、RC積分回路とダイアックのよ
うな非線形スイッチング素子Ｓとから構成することがで
きる。両端子T1及びT2に二次巻線の一方の極性の半波が
印加されると、抵抗ＲとコンデンサＣとにより定まる時
定数でコンデンサＣは充電され、コンデンサＣの端子電
圧Vcが非線形スイッチング素子Ｓの導通レベル（導通時
の閾値）に達して導通状態になると、スイッチング素子
Ｓは導通して発光ダイオードLEDを発光させる。このと
きコンデンサＣの電荷は発光ダイオードLEDを通して放
電され、コンデンサＣの端子電圧がスイッチグ素子Ｓの
遮断レベル（遮断時の閾値）まで低下するとスイッチグ
素子Ｓは遮断して発光ダイオードは発光を停止する。そ
して再びコンデンサＣが充電されて端子電圧Vcが導通レ
ベルに達するとスイッチング素子Ｓが導通し、次いで上
記の遮断動作が行われる。このスイッチング素子Ｓの導
通遮断の繰り返しによりアナログ信号の半波がパルス信
号列からなるデジタル信号に変換される。FIG. 2 shows a basic principle circuit diagram of an example of a circuit for converting an analog signal into a digital signal by the pulse signal generation circuits PG1 and PG2. This circuit can be composed of an RC integrating circuit and a non-linear switching element S such as a diac. When a half-wave of one polarity of the secondary winding is applied to both terminals T1 and T2, the capacitor C is charged with a time constant determined by the resistor R and the capacitor C, and the terminal voltage Vc of the capacitor C becomes a non-linear switching element. When the conduction level of S (the threshold value at the time of conduction) is reached and the state of conduction is reached, the switching element S conducts and causes the light emitting diode LED to emit light. At this time, the electric charge of the capacitor C is discharged through the light emitting diode LED, and when the terminal voltage of the capacitor C drops to the cutoff level of the switching element S (threshold value at the time of cutoff), the switching element S is cut off and the light emitting diode stops emitting light. Then, when the capacitor C is charged again and the terminal voltage Vc reaches the conductive level, the switching element S becomes conductive, and then the above-described cutoff operation is performed. By repeating the conduction interruption of the switching element S, the half wave of the analog signal is converted into a digital signal composed of a pulse signal train.
入力電圧の振幅値が最大値に向うに従って、コンデンサ
Ｃの充電時間は早くなるため、発光ダイオードLEDに印
加されるパルスの周期（パルス間隔）は短くなる。した
がって発光ダイオードLEDに印加されるパルスの周期
は、入力される半波電圧の振幅の変化に対応して変化す
る。第３図は入力される電圧の振幅の相違に応じてパル
スの周期が変化する状態を示している。第３図（Ａ）に
示すように二次巻線に誘起される電圧（V1及びV2）は、
一次電流の大きさに応じて振幅が変化する。振幅が大き
い電圧V1が入力されると、第３図（Ｂ）及び（Ｃ）に示
すようにコンデンサＣの端子電圧Vc1が導通レベルVrに
達するまでの時間t1は短い。入力電圧V2のように振幅が
小さくなると、コンデンサＣの端子電圧Vc2が導通レベ
ルVrに達するまでの時間t2は長くなる。したがって入力
電圧の振幅に応じて、パルス信号（P1及びP2）の周期及
び数が相違することになる。As the amplitude value of the input voltage approaches the maximum value, the charging time of the capacitor C becomes shorter, so that the cycle (pulse interval) of the pulse applied to the light emitting diode LED becomes shorter. Therefore, the cycle of the pulse applied to the light emitting diode LED changes corresponding to the change in the amplitude of the half-wave voltage input. FIG. 3 shows a state in which the pulse cycle changes according to the difference in the amplitude of the input voltage. As shown in FIG. 3 (A), the voltages (V1 and V2) induced in the secondary winding are
The amplitude changes according to the magnitude of the primary current. When the voltage V1 having a large amplitude is input, as shown in FIGS. 3B and 3C, the time t1 until the terminal voltage Vc1 of the capacitor C reaches the conduction level Vr is short. When the amplitude becomes small like the input voltage V2, the time t2 until the terminal voltage Vc2 of the capacitor C reaches the conduction level Vr becomes longer. Therefore, the cycle and the number of pulse signals (P1 and P2) differ depending on the amplitude of the input voltage.
なお第１図（Ａ）に示した構成の光変流器において、パ
ルス信号発生回路PG1及びPG2から出力されるパルス信号
の振幅値に差を設ければ、第４図（Ａ）に示す二次側出
力を第４図（Ｂ）に示す光信号に変換することができ、
受信側での極性の識別が容易になる。In the optical current transformer having the configuration shown in FIG. 1 (A), if the amplitude values of the pulse signals output from the pulse signal generation circuits PG1 and PG2 are made different, the two shown in FIG. 4 (A) are obtained. The secondary output can be converted into the optical signal shown in FIG. 4 (B),
The receiving side can easily identify the polarity.
第１図（Ｂ）は、請求項４項に記載の考案の光変流器の
実施例の概略構成図を示している。本実施例では、第１
及び第２のパルス信号発生器PG1及びPG2でそれぞれ個別
に発光ダイオードLED1及びをLED2を点滅させて、２本の
光伝送路OF1及びOF2を介して受信側に光信号を伝送す
る。第４図（Ｃ）及び（Ｄ）は、第１及び第２のパルス
信号発生回路PG1及びPG2から出力されるパルス信号列で
駆動されて発光する発光ダイオードLED1及びLED2から出
力される光信号の状態をそれぞれれ示している。FIG. 1 (B) shows a schematic configuration diagram of an embodiment of the optical current transformer of the present invention. In this embodiment, the first
The second pulse signal generators PG1 and PG2 individually blink the light emitting diodes LED1 and LED2 to transmit the optical signal to the receiving side through the two optical transmission lines OF1 and OF2. 4C and 4D show optical signals output from the light emitting diodes LED1 and LED2 that are driven by the pulse signal trains output from the first and second pulse signal generation circuits PG1 and PG2 to emit light. Each state is shown.
第５図は、本考案の変流器の具体的な実施例を示してい
る。本実施例は第１図（Ａ）の基本構成と同様に、１個
の発光手段を用いて光信号を発生するものである。変流
器の二次巻線L2に対して負荷抵抗RLとサージ吸収用コン
デンサCLとが並列接続されている。第１及び第２のパル
ス信号発生回路PG1及びPG2は、積分用抵抗R11及びR12と
積分用コンデンサC11及びC12とからなる積分回路を備え
ている。積分用コンデンサC11及びC12の両端には、リセ
ット用放電抵抗R21及びR22が並列接続されており、放電
抵抗R21及びR22は、他方のパルス信号発生回路が作動し
ているときに、積分用コンデンサC11及びC12の残留電荷
を放電させて、積分回路をリセット状態にする。SW1及
びSW2は、積分用コンデンサC11及びC12の端子電圧が所
定のレベルに達すると導通してコンデンサC11及びC12の
電荷を放電させるスイッチング回路である。該スイッチ
ング回路SW1及びSW2は、ダイアック、ユニジャンクショ
ン・トランジスタ（UJT），プログラマブル・ユニジャ
ンクション・トランジスタ（PUT）等の非線形スイッチ
ング素子を含んで構成される。なおスイッチング素子と
してダイアックを使用した場合には、入力電圧が他方の
半波に移行した時に、コンデンサC11及びC12の電荷はダ
イアックを通して放電されるため、放電用抵抗R21及びR
22を設ける必要はない。なおスイッチング回路SW1及びS
W2は、コンデンサの端子電圧に応じてオンオフを繰り返
すものであれば、いかなる構成でもよい。FIG. 5 shows a specific embodiment of the current transformer of the present invention. In this embodiment, as in the basic configuration shown in FIG. 1A, one light emitting means is used to generate an optical signal. A load resistance R L and a surge absorbing capacitor C L are connected in parallel to the secondary winding L2 of the current transformer. The first and second pulse signal generation circuits PG1 and PG2 each include an integrating circuit including integrating resistors R11 and R12 and integrating capacitors C11 and C12. The reset discharge resistors R21 and R22 are connected in parallel to both ends of the integrating capacitors C11 and C12.The discharging resistors R21 and R22 are connected to the integrating capacitor C11 when the other pulse signal generating circuit is operating. The residual charge of C12 and C12 is discharged, and the integrating circuit is reset. SW1 and SW2 are switching circuits that conduct when the terminal voltages of the integrating capacitors C11 and C12 reach a predetermined level and discharge the charges of the capacitors C11 and C12. The switching circuits SW1 and SW2 are configured to include a non-linear switching element such as a diac, a unijunction transistor (UJT), a programmable unijunction transistor (PUT). When a diac is used as the switching element, when the input voltage shifts to the other half-wave, the electric charges of the capacitors C11 and C12 are discharged through the diac, and therefore the discharging resistors R21 and R12.
It is not necessary to provide 22. The switching circuits SW1 and S
W2 may have any configuration as long as it is repeatedly turned on and off according to the terminal voltage of the capacitor.
抵抗R31〜R52は、電流調整用の抵抗であり、これら抵抗
の抵抗値を適宜に選択して発光ダイオードLEDに印加さ
れるパルス信号の振幅を調整することにより発光ダイオ
ードLEDの発光量を調整する。ZXTは、公知のゼロクロス
パルス発生回路であり、この回路ZXTは第６図（Ａ）に
示すように、入力電圧が一方の極性の半波から他方の極
性の半波に移行する点Ｘを検出して、ゼロクロスパルス
信号を発生する。このゼロクロスパルス信号は、第１及
び第２のパルス信号発生回路PG1及びPG2から出力される
パルス信号と識別可能な信号であり、例えば発光ダイオ
ードLEDを発光させた時に第６図（Ｂ）に示すような振
幅の大きな光信号OSxに変換される。なお本実施例にお
いては、電流調整用の抵抗R31〜R52を調整してパルス信
号発生回路から出力されるパルス信号の振幅に差を設け
ているので、第６図（Ｂ）に示すように、入力電圧の極
性の異なる半波に対応して各発光ダイオードLEDから出
力される光信号列OS1及びOS2の各光信号の振幅に差が設
けられて、極性の判別が可能になっている。The resistors R31 to R52 are resistors for current adjustment, and the amount of light emitted from the light emitting diode LED is adjusted by appropriately selecting the resistance value of these resistors and adjusting the amplitude of the pulse signal applied to the light emitting diode LED. . ZXT is a known zero-cross pulse generation circuit, and this circuit ZXT detects a point X at which the input voltage shifts from a half wave of one polarity to a half wave of the other polarity, as shown in FIG. 6 (A). Then, a zero-cross pulse signal is generated. This zero-cross pulse signal is a signal that can be distinguished from the pulse signals output from the first and second pulse signal generation circuits PG1 and PG2, and is shown in FIG. 6 (B) when the light emitting diode LED is made to emit light, for example. It is converted into an optical signal OSx having a large amplitude. In the present embodiment, the resistors R31 to R52 for current adjustment are adjusted to provide a difference in the amplitude of the pulse signal output from the pulse signal generation circuit. Therefore, as shown in FIG. 6 (B), A difference is provided in the amplitude of each optical signal of the optical signal trains OS1 and OS2 output from each light emitting diode LED corresponding to the half waves having different polarities of the input voltage, so that the polarity can be discriminated.
［考案の効果］ 本考案によれば、第１及び第２のパルス信号発生回路に
より、変流器の二次側出力の各半波を、各半波の振幅の
変化に対応して周期が変化する複数のパルス信号に変換
してデジタル化するようにしたので、光伝送路の経年変
化及び発光手段の温度特性により発光量が減衰しても、
変流器の二次側出力の情報を受信側で正確に検知するこ
とができる。[Effect of the Invention] According to the present invention, each half wave of the secondary side output of the current transformer has a cycle corresponding to the change of the amplitude of each half wave by the first and second pulse signal generating circuits. Since it is converted into a plurality of changing pulse signals and digitized, even if the light emission amount is attenuated due to the secular change of the optical transmission line and the temperature characteristic of the light emitting means,
The information on the secondary side output of the current transformer can be accurately detected on the receiving side.
特に請求項１に記載の考案によれば、第１及び第２のパ
ルス信号発生回路に対して１つの発光手段を設けて、１
つの発光手段で光信号を出力するようにしているので、
少ない部品点数で変流器を構成することができ、変流器
の価格を下げることができる。Particularly, according to the first aspect of the invention, one light emitting means is provided for the first and second pulse signal generating circuits, and
Since the light signal is output by the two light emitting means,
The current transformer can be configured with a small number of parts, and the cost of the current transformer can be reduced.
また請求項２に記載の考案によれば、第１及び第２のパ
ルス信号発生回路から出力されるパルス信号の振幅に差
を設けるため、光信号の振幅の大小から、変流器の二次
側出力の各半波の極性を受信側で簡単に判別することが
できる利点がある。According to the second aspect of the invention, since the amplitudes of the pulse signals output from the first and second pulse signal generation circuits are made different, the secondary of the current transformer is changed depending on the magnitude of the amplitude of the optical signal. There is an advantage that the receiving side can easily determine the polarity of each half-wave of the side output.
更に請求項３に記載の考案によれば、ゼロクロスパルス
信号を発生させてパルス列からなる光信号中に二次側出
力の半波が切替わる点を表示する光パルス信号を含ませ
ることができるので、受信側でのデジタル処理が容易に
なる利点がある。Further, according to the third aspect of the invention, it is possible to generate a zero-cross pulse signal and include an optical pulse signal indicating a point at which the half wave of the secondary side output is switched in the optical signal composed of the pulse train. There is an advantage that digital processing on the receiving side becomes easy.
第１図（Ａ）及び（Ｂ）はそれぞれ本考案の実施例の概
略構成図、第２図はパルス信号発生回路の一例の基本回
路図、第３図は第２図の回路の動作状態を説明するため
に用いる波形図、第４図は第１図（Ａ）及び（Ｂ）の実
施例の動作を説明するための波形図、第５図は本考案の
具体的実施例の回路図、第６図は第５図の実施例の動作
を説明するための波形図及び第７図は従来の光変流器の
回路図である。 L2……変流器の二次巻線、D1〜D4……ダイオード、PG1
……第１のパルス信号発生回路、PG2……第２のパルス
信号発生回路、LED,LED1,LED2……発光ダイオード（発
光手段）、Ｒ……抵抗、Ｃ……コンデンサ、Ｓ……非線
形スイッチング素子、RL……負荷抵抗、CL……サージ吸
収用コンデンサ。1 (A) and 1 (B) are schematic configuration diagrams of an embodiment of the present invention, FIG. 2 is a basic circuit diagram of an example of a pulse signal generation circuit, and FIG. 3 is an operation state of the circuit of FIG. FIG. 4 is a waveform diagram used for explaining, FIG. 4 is a waveform diagram for explaining the operation of the embodiment of FIGS. 1 (A) and (B), and FIG. 5 is a circuit diagram of a concrete embodiment of the present invention. FIG. 6 is a waveform diagram for explaining the operation of the embodiment of FIG. 5, and FIG. 7 is a circuit diagram of a conventional optical current transformer. L2 …… Secondary winding of current transformer, D1 to D4 …… Diode, PG1
...... First pulse signal generation circuit, PG2 ...... Second pulse signal generation circuit, LED, LED1, LED2 ...... Light emitting diode (light emitting means), R ...... Resistance, C ...... Capacitor, S ...... Non-linear switching Element, R L …… Load resistance, C L …… Surge absorption capacitor.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０４Ｂ 10/00 Ｇ０８Ｃ 23/00 Ａ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location H04B 10/00 G08C 23/00 A
Claims (4)
光信号を光伝送路に出力する光変流器において、 前記二次側出力の一方の極性の半波を入力とし、該半波
の振幅の変化に対応して周期が変化する複数のパルス信
号を発生する第１のパルス信号発生回路と、 前記二次側出力の他方の極性の半波を入力とし、該半波
の振幅の変化に対応して周期が変化する複数のパルス信
号を発生する第２のパルス信号発生回路と、 前記パルス信号によって駆動されて点滅し前記光信号を
発生する１つの発光手段とを具備してなる光変流器。1. An optical current transformer for converting a secondary side output of a current transformer into an optical signal and outputting the optical signal to an optical transmission line, wherein a half wave of one polarity of the secondary side output is inputted. A first pulse signal generating circuit for generating a plurality of pulse signals whose cycle changes in response to a change in the amplitude of the half wave; and a half wave of the other polarity of the secondary output as an input, A second pulse signal generation circuit that generates a plurality of pulse signals whose cycles change in response to changes in the amplitude of the half wave; and one light emitting unit that is driven by the pulse signals to blink and generate the optical signals. An optical current transformer comprising:
れるパルス信号と前記第２のパルス信号発生回路から出
力されるパルス信号の振幅に差を設けた請求項１に記載
の光変流器。2. The optical current transformer according to claim 1, wherein the pulse signal output from the first pulse signal generating circuit and the pulse signal output from the second pulse signal generating circuit have a difference in amplitude. vessel.
出して前記パルス信号と比べて識別可能なゼロクロスパ
ルス信号を前記発光手段に供給するゼロクロスパルス信
号発生回路を更に備えてなる請求項１に記載の光変流
器。3. A zero-cross pulse signal generation circuit for detecting a zero-cross point of the secondary side output and supplying a zero-cross pulse signal which can be discriminated by comparison with the pulse signal to the light emitting means. The described optical current transformer.
光信号を光伝送路に出力する光変流器において、 前記二次側出力の一方の極性の半波を入力とし、該半波
の振幅の変化に対応して周期が変化する複数のパルス信
号を発生する第１のパルス信号発生回路と、 前記第１のパルス信号発生回路の出力により駆動されて
点滅して光信号を第１の光伝送路に出力する第１の発光
手段と、 前記二次側出力の他方の極性の半波を入力とし、該半波
の振幅の変化に対応して周期が変化する複数のパルス信
号を発生する第２のパルス信号発生回路と、 前記第２のパルス信号発生回路の出力により駆動されて
点滅して光信号を第２の光伝送路に出力する第２の発光
手段とを具備してなる光変流器。4. An optical current transformer for converting a secondary side output of a current transformer into an optical signal and outputting the optical signal to an optical transmission line, wherein one half-wave of one polarity of the secondary side output is inputted. A first pulse signal generating circuit that generates a plurality of pulse signals whose cycle changes in response to a change in the amplitude of the half wave; and a blinking signal that is driven by the output of the first pulse signal generating circuit. A first light emitting means for outputting an optical signal to a first optical transmission line, and a half wave of the other polarity of the secondary side output as an input, and the cycle changes in response to a change in the amplitude of the half wave. A second pulse signal generating circuit for generating a plurality of pulse signals; and a second light emitting means that is driven by the output of the second pulse signal generating circuit and blinks to output an optical signal to the second optical transmission line. An optical current transformer comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989053710U JPH0741226Y2 (en) | 1989-05-10 | 1989-05-10 | Light current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989053710U JPH0741226Y2 (en) | 1989-05-10 | 1989-05-10 | Light current transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02145836U JPH02145836U (en) | 1990-12-11 |
| JPH0741226Y2 true JPH0741226Y2 (en) | 1995-09-20 |
Family
ID=31575134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989053710U Expired - Fee Related JPH0741226Y2 (en) | 1989-05-10 | 1989-05-10 | Light current transformer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0741226Y2 (en) |
-
1989
- 1989-05-10 JP JP1989053710U patent/JPH0741226Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02145836U (en) | 1990-12-11 |
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