JPH0148704B2 - - Google Patents
Info
- Publication number
- JPH0148704B2 JPH0148704B2 JP57118264A JP11826482A JPH0148704B2 JP H0148704 B2 JPH0148704 B2 JP H0148704B2 JP 57118264 A JP57118264 A JP 57118264A JP 11826482 A JP11826482 A JP 11826482A JP H0148704 B2 JPH0148704 B2 JP H0148704B2
- Authority
- JP
- Japan
- Prior art keywords
- output
- optical
- transformer
- receiving side
- light emitting
- 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
- 230000003287 optical effect Effects 0.000 claims description 16
- 239000013307 optical fiber Substances 0.000 claims description 10
- 230000010355 oscillation Effects 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000010356 wave oscillation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Description
【発明の詳細な説明】 本発明は光変成器に関する。[Detailed description of the invention] The present invention relates to optical transformers.
通常発光ダイオードをアナログ信号の光源に使
用する場合、適当なバイアス電圧を加え、直線性
の良好な範囲内で電気信号による光出力の振巾変
調を行つている。しかしこの発光ダイオードを光
変成器の光源に使用する場合はいわゆる高電圧部
位に設けられるところから、安定なバイアス電圧
を供給することが困難となる。このため従来は、
正極性電圧を分担するダイオードと負極性電圧を
分担するダイオードとを組み合わせ、交流の半周
期ごとにそれぞれのダイオードを発光させて得ら
れる光信号を２本の光フアイバで別々に伝送し、
光信号受信側で光電変換した後交流に復元してい
る。 Normally, when a light emitting diode is used as a light source for an analog signal, an appropriate bias voltage is applied to perform amplitude modulation of the optical output using an electrical signal within a range with good linearity. However, when this light emitting diode is used as a light source of an optical transformer, it is difficult to supply a stable bias voltage because it is installed in a so-called high voltage region. For this reason, conventionally,
A diode that shares positive polarity voltage and a diode that shares negative polarity voltage are combined, and the optical signals obtained by causing each diode to emit light every half cycle of alternating current are transmitted separately through two optical fibers.
After photoelectric conversion on the optical signal receiving side, the signal is restored to alternating current.
しかしながら、発光ダイオードをこのように使
うと、当然ダイオードに固有の閾値電圧の問題が
発生し、正弦波交流の零点から閾値電圧に達する
までの時間帯は発光せず、従つて、光フアイバを
経て伝送されてきた光信号を受信側で電気信号に
復元してもそのままでは脈流が得られるだけで正
弦波交流を再現させることができない。 However, when using light emitting diodes in this way, the problem of threshold voltage inherent in diodes naturally arises, and no light is emitted during the period from the zero point of the sine wave alternating current until the threshold voltage is reached, and therefore, light emitting diodes cannot be used via optical fibers. Even if the transmitted optical signal is restored to an electrical signal on the receiving side, only a pulsating current will be obtained and it will not be possible to reproduce a sine wave alternating current.
本発明は、上述の事柄に留意してなされたもの
で、変成器の二次側出力を発光ダイオードに与え
正極性電圧、負極性電圧に対応してそれぞれ得ら
れる光信号を光フアイバを用いてアナログ伝送
し、受信側で光信号を電気信号に変換して合成す
る光変成器において、前記光フアイバの受信側に
矩形波出力を発信するマルチバイブレータと、ロ
ーパスフルタを設け、前記マルチバイブレータの
発振周期を前記変成器の二次側出力の正弦波交流
の周期と一致させると共に矩形波出力を前記発光
ダイードの閾値電圧に見合つた値に設定し、この
矩形波出力を前記光フアイバ受信側で光信号に基
づく電気信号を合成して得られる脈流出力に加算
し、得られた波形を前記ローパスフイルタを介し
て高調波成分を除去してなるもので、原波形に忠
実な正弦波交流を再現しようとするものである。 The present invention has been made with the above-mentioned considerations in mind, and uses an optical fiber to apply the secondary side output of a transformer to a light emitting diode and obtain optical signals corresponding to positive polarity voltage and negative polarity voltage. In an optical transformer that performs analog transmission and converts and synthesizes optical signals into electrical signals on the receiving side, a multivibrator that transmits a rectangular wave output and a low-pass filter are provided on the receiving side of the optical fiber, and the oscillation of the multivibrator is provided. The period is made to match the period of the sine wave alternating current of the secondary side output of the transformer, and the rectangular wave output is set to a value commensurate with the threshold voltage of the light emitting diode, and this rectangular wave output is optically transmitted at the receiving side of the optical fiber. The electric signal based on the signal is synthesized and added to the pulsating output, and the resulting waveform is passed through the above-mentioned low-pass filter to remove harmonic components, reproducing a sine wave alternating current that is faithful to the original waveform. This is what I am trying to do.
以下、本発明を図面に示す実施例に従つて説明
する。第１図は、本発明の一実施例を示す回路構
成図である。Trは高電位部に設けられた変成器
で、その端子１，２に現われる二次側出力ａは、
第２図ａに示すような波形であつて、抵抗R1，
R2、サーミスタRtにより構成された温度補償回
路を経て発光ダイオードD1，D2に与えられる。
この発光ダイオードD1，D2はそれぞれ正極性電
圧、負極性電圧に対応して発光するよう接続され
ている。その出力である光信号は光フアイバF1，
F2を経て受信側に導かれる。D3，D4は受信側に
設けられたフオトダイオードで、前記光信号はこ
のダイオードD3，D4によつて電気信号に変換さ
れる。この信号により負荷抵抗R3，R4の両端に
脈流出力が発生し、オペアンプIC1の出力負荷抵
抗R7の両端には第２図ｂに示す如き波形の脈流
出力ｂが得られる。この脈流出力ｂ波形と変成器
Trの二次側出力ａの波形との位相関係は、矢印
で示すように、発光ダイオードD1，D2に固有の
閾値電圧Vthにより決まる。 Hereinafter, the present invention will be explained according to embodiments shown in the drawings. FIG. 1 is a circuit diagram showing an embodiment of the present invention. The Tr is a transformer installed in the high potential section, and the secondary output a appearing at its terminals 1 and 2 is
The waveform is as shown in FIG. 2a, and the resistance R 1 ,
It is applied to the light emitting diodes D 1 and D 2 via a temperature compensation circuit composed of R 2 and thermistor Rt.
The light emitting diodes D 1 and D 2 are connected to emit light in response to positive and negative voltages, respectively. The output optical signal is transmitted through optical fiber F 1 ,
It is guided to the receiving side via F 2 . D 3 and D 4 are photodiodes provided on the receiving side, and the optical signals are converted into electrical signals by these diodes D 3 and D 4 . This signal generates a pulsating output across the load resistors R 3 and R 4 , and a pulsating output b having a waveform as shown in FIG. 2b is obtained across the output load resistor R 7 of the operational amplifier IC 1 . This pulsating output b waveform and transformer
The phase relationship with the waveform of the secondary output a of the Tr is determined by the threshold voltage Vth specific to the light emitting diodes D 1 and D 2 , as shown by the arrow.
再び第１図に戻り、抵抗R3はフオトダイオー
ドD3，D4の出力電圧の平衡をとるため可変抵抗
とし、抵抗R3，R4，R5およびR6の各抵抗値の間
にはR5／R3＝R6／R4なる関係をもたせてある。
IC2，IC3，IC4およびIC5はオペアンプである。オ
ペアンプIC2は非反転帰還形のオペアンプで、抵
抗R8，R9によりオペアンプIC1の出力電圧を１＋
R9／R8倍に増巾し、その出力を抵抗R10，R11で
分圧し、ダイオードD5により正の半波のみを結
合コンデンサC1を介して矩形波発振用マルチバ
イブレータとして作用するオペアンプIC3に同期
信号としている。マルチバイブレータIC3の発振
周期Ｔは、コンデンサC2の容量値と抵抗R12，
R13，R14およびR15の抵抗値により
Ｔ＝2C2R12ln（１＋2R15／R13＋R14）
のように決まる。この発振周期Ｔを第２図ａに示
す変成器Trの二次側出力ａの正弦波交流の周期
と一致するように選んでおけば、マルチバイブレ
ータIC3の出力として、第２図ｃに示すように、
前記脈流出力ｂに同期した繰返し周期Ｔの矩形波
信号Ｃが得られる。この矩形波信号Ｃを抵抗１
６，１７により適当なレベルに分圧して矩形波信
号C′を得る。この矩形波信号C′と前記差動増巾器
IC1からの脈流出力ｂとをオペアンプIC4に入力し
て差動増巾すると、第２図ｄに示すように、奇数
次高調波を含有した歪波形交流ｄが得られる。な
お、抵抗R18，R19は次に述べるローパスアクテ
イブフイルタＦを飽和させないよう低抵抗を使用
する。このローパスアクテイブフイルタＦは抵抗
R20，R21およびR22、コンデンサC3，C4とオペア
ンプIC5とで構成されていて、そのしや断周波数
は100Hzである。そして、商用周波数の交流の第
３高調波以上は減衰が大きく、基本波成分のみが
設定利得で出力されるため、抵抗R20とコンデン
サC3との積分時定数（C3・R20）で決まる位相遅
延をコンデンサC5と抵抗R23とで構成される微分
回路DFにより補正してやると、第２図ｅに示す
ような出力波形ｅが出力端子３とアース間に得ら
れる。この出力波形は変成器Trの二次側出力ａ
の正弦波形と全く相似である。 Returning to Figure 1 again, the resistor R 3 is a variable resistor to balance the output voltages of the photodiodes D 3 and D 4 , and the resistance values of the resistors R 3 , R 4 , R 5 and R 6 are The relationship is R 5 /R 3 =R 6 /R 4 .
IC 2 , IC 3 , IC 4 and IC 5 are operational amplifiers. Operational amplifier IC 2 is a non-inverting feedback type operational amplifier, and the output voltage of operational amplifier IC 1 is set to 1+ by resistors R 8 and R 9 .
Amplify R 9 /R 8 times, divide the output with resistors R 10 and R 11 , and use diode D 5 to combine only the positive half wave and act as a multivibrator for square wave oscillation via capacitor C 1 . It is used as a synchronization signal to operational amplifier IC 3 . The oscillation period T of the multivibrator IC 3 is determined by the capacitance value of the capacitor C 2 and the resistance R 12 ,
It is determined by the resistance values of R 13 , R 14 and R 15 as T=2C 2 R 12 ln (1+2R 15 /R 13 +R 14 ). If this oscillation period T is selected to match the period of the sine wave alternating current of the secondary output a of the transformer Tr shown in Fig. 2a, the output of the multivibrator IC 3 will be as shown in Fig. 2c. like,
A rectangular wave signal C with a repetition period T synchronized with the pulsating output b is obtained. This square wave signal C is connected to the resistor 1
6 and 17 to obtain a rectangular wave signal C'. This square wave signal C' and the differential amplifier
When the pulsating output b from IC 1 is input to the operational amplifier IC 4 and differentially amplified, a distorted waveform AC d containing odd harmonics is obtained, as shown in FIG. 2d. Note that low resistances are used for the resistors R 18 and R 19 so as not to saturate the low-pass active filter F described below. This low-pass active filter F is a resistor
It consists of R 20 , R 21 and R 22 , capacitors C 3 and C 4 and an operational amplifier IC 5 , and its cutting frequency is 100Hz. Since the third harmonic of AC at the commercial frequency and higher attenuation is large, and only the fundamental wave component is output at the set gain, the integration time constant (C 3 · R 20 ) of resistor R 20 and capacitor C 3 When the determined phase delay is corrected by a differentiating circuit DF consisting of a capacitor C5 and a resistor R23 , an output waveform e as shown in FIG. 2e is obtained between the output terminal 3 and the ground. This output waveform is the secondary side output a of the transformer Tr.
It is completely similar to the sine waveform of .
つまり、マルチバイブレータIC3の出力である
矩形波出力Ｃを発光ダイオードD1，D2に特有の
閾値電圧Vthに見合つた適当な値に設定しておけ
ば、変成器Trの出力が広範囲に変動しても常に
比例関係を保つことができる。 In other words, if the rectangular wave output C, which is the output of the multivibrator IC 3 , is set to an appropriate value commensurate with the threshold voltage Vth specific to the light emitting diodes D 1 and D 2 , the output of the transformer Tr can vary over a wide range. However, a proportional relationship can always be maintained.
本発明によれば、変成器の二次側出力に相似し
た歪の全くない正弦波交流を再現することが可能
となり、従つて、精度の高い検出が可能となる。 According to the present invention, it is possible to reproduce a completely distortion-free sinusoidal alternating current similar to the secondary output of a transformer, and therefore, highly accurate detection is possible.
第１図は、本発明の一実施例を示す回路図、第
２図は本発明の動作を説明するための波形図であ
る。
Tr……変成器、D1，D2……発光ダイオード、
F1，F2……光フアイバ、ａ……変成器の二次側
出力、ｂ……脈流出力、Ｃ，C′……矩形波信号、
ｅ……出力波形。
FIG. 1 is a circuit diagram showing one embodiment of the present invention, and FIG. 2 is a waveform diagram for explaining the operation of the present invention. Tr...Transformer, D1 , D2 ...Light emitting diode,
F 1 , F 2 ... optical fiber, a ... secondary output of transformer, b ... pulsating output, C, C' ... square wave signal,
e...Output waveform.
Claims (1)
正極性電圧、負極性電圧に対応してそれぞれ得ら
れる光信号を光フアイバを用いてアナログ伝送
し、受信側で光信号を電気信号に変換して合成す
る光変成器において、前記光フアイバの受信側に
矩形波出力を発信するマルチバイブレータと、ロ
ーパスフルタを設け、前記マルチバイブレータの
発振周期を前記変成器の二次側出力の正弦波交流
の周期と一致させると共に矩形波出力を前記発光
ダイードの閾値電圧に見合つた値に設定し、この
矩形波出力を前記光フアイバ受信側で光信号に基
づく電気信号を合成して得られる脈流出力に加算
し、得られた波形を前記ローパスフイルタを介し
て高調波成分を除去してなる光変成器。1 The secondary output of the transformer is applied to a light emitting diode, and the optical signals obtained in response to the positive and negative voltages are transmitted in analog form using an optical fiber, and the optical signals are converted into electrical signals on the receiving side. In the optical transformer, a multivibrator that emits a rectangular wave output and a low-pass filter are provided on the receiving side of the optical fiber, and the oscillation period of the multivibrator is set to the sine wave alternating current of the secondary output of the transformer. The rectangular wave output is set to a value that matches the cycle and the threshold voltage of the light emitting diode, and this rectangular wave output is converted into a pulsating output obtained by combining an electrical signal based on the optical signal on the receiving side of the optical fiber. An optical transformer in which harmonic components are removed from the resulting waveform through the low-pass filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57118264A JPS598439A (en) | 1982-07-06 | 1982-07-06 | Optical transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57118264A JPS598439A (en) | 1982-07-06 | 1982-07-06 | Optical transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS598439A JPS598439A (en) | 1984-01-17 |
| JPH0148704B2 true JPH0148704B2 (en) | 1989-10-20 |
Family
ID=14732321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57118264A Granted JPS598439A (en) | 1982-07-06 | 1982-07-06 | Optical transformer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS598439A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0712477B2 (en) * | 1987-02-16 | 1995-02-15 | ユニチカ株式会社 | How to remove phosphorus in water |
| JPH02309828A (en) * | 1989-05-25 | 1990-12-25 | Mitsubishi Electric Corp | Drive method for laser diode and laser diode module |
-
1982
- 1982-07-06 JP JP57118264A patent/JPS598439A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS598439A (en) | 1984-01-17 |
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