JPS5920653Y2 - Photodetector circuit - Google Patents
Photodetector circuitInfo
- Publication number
- JPS5920653Y2 JPS5920653Y2 JP10344677U JP10344677U JPS5920653Y2 JP S5920653 Y2 JPS5920653 Y2 JP S5920653Y2 JP 10344677 U JP10344677 U JP 10344677U JP 10344677 U JP10344677 U JP 10344677U JP S5920653 Y2 JPS5920653 Y2 JP S5920653Y2
- Authority
- JP
- Japan
- Prior art keywords
- light
- receiving element
- circuit
- coil
- parallel resonant
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Landscapes
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Description
【考案の詳細な説明】
本考案は光線式検知器の受光回路に関するもので、その
目的とするところは直流光による受光素子の飽和を防止
し、且つ信号変調光に対しては高感度となる光線式検知
器の受光回路を提供するにある。[Detailed description of the invention] This invention relates to a light receiving circuit for a light beam detector, and its purpose is to prevent saturation of the light receiving element by DC light and to achieve high sensitivity to signal modulated light. The present invention provides a light receiving circuit for a light beam detector.
一般に太陽電池のような受光素子を用いた場合、太陽光
等の直流光によって受光素子が飽和してしまうという欠
点か′ある。Generally, when a light-receiving element such as a solar cell is used, a drawback is that the light-receiving element is saturated by direct current light such as sunlight.
そこで従来は第１図に示すように、太陽電池のような受
光素子３に並列に負荷抵抗Ｒｌ−を接続し、負荷抵抗を
小さくしたり、或いは第２図に示すように負荷抵抗Ｒ１
−と受光素子３との直列回路に逆バイアス電圧を印加す
る等の方法を用いていた苔ところがこれらの方法例えば
前者にあっては信号変調光に対する感度（出力）が小さ
くなり、また後者にあっても同様に負荷抵抗ＲＬによっ
て信号変調光に対する感度が小さくなり、且つ商用電源
で点灯される照明器具の照明光等による影響を抑制する
ことも困難であるという問題があった。Therefore, conventionally, as shown in FIG. 1, a load resistor R1- is connected in parallel to the light receiving element 3 such as a solar cell to reduce the load resistance, or as shown in FIG.
However, in the former case, the sensitivity (output) to the signal modulated light becomes small, and in the latter case, the sensitivity (output) to the signal modulated light becomes small. Similarly, there is a problem that the sensitivity to signal modulated light is reduced by the load resistor RL, and it is also difficult to suppress the influence of illumination light from a lighting fixture turned on by a commercial power source.
本考案は、上述の欠点に鑑みて提供したもので、以下実
施例によって説明する。The present invention has been proposed in view of the above-mentioned drawbacks, and will be described below with reference to Examples.
第３図は実施例回路を示し、太陽電池のような受光素子
３に対して、コイル１とコンデンサ２の並列共振回路を
直列に接続し、受光素子３に対して逆バイアスとなる電
圧を電源部子Ｖｃｃより前記直列回路に印加するように
し、コンテ゛ンサＣを介して出力を得るようになってい
る。FIG. 3 shows an example circuit, in which a parallel resonant circuit consisting of a coil 1 and a capacitor 2 is connected in series to a light receiving element 3 such as a solar cell, and a voltage that is reverse biased to the light receiving element 3 is applied to the power source. The voltage is applied to the series circuit from the terminal Vcc, and an output is obtained via the capacitor C.
即ち直流光に対する負荷はコイル１の直流抵抗骨によっ
て決定され、信号変調光Ｘに対する負荷は、コンテ゛ン
サ２との共振インピーダンスによって設定することによ
り信号変調光Ｘに対する出力を最大に抽出可能としたも
のである。That is, the load on the DC light is determined by the DC resistance of the coil 1, and the load on the signal modulated light X is set by the resonance impedance with the capacitor 2, so that the output for the signal modulated light X can be extracted to the maximum. be.
第４図は負荷特性を示すもので、図中■は、Ｌ、Ｇ共振
インピータンス特性を示し、■は逆バイアス時の信号光
抽出特性を示し、６はコイル１の直流抵抗骨を示し、■
は逆バイアス時の耐直流光特性を示し、図中Ｌｌ乃至Ｌ
６はコイル１の各インダクタンスの電圧■−電電流時特
性示す。Figure 4 shows the load characteristics, in which ■ indicates the L and G resonance impedance characteristics, ■ indicates the signal light extraction characteristic during reverse bias, 6 indicates the DC resistance bone of the coil 1, ■
indicates the DC light resistance characteristics at the time of reverse bias, and Ll to L in the figure
6 shows the voltage - current characteristics of each inductance of the coil 1.
本考案は、コイルとコンテ゛ンサとの並列共振回路と、
太陽電池のような受光素子とを直列に接続してこの直列
回路に受光素子に対して逆バイアスになる電圧を印加し
であるので、太陽光等の直流光によって周囲照度が非常
に明るくなっても、逆バイアス電圧と、コイルの低い直
流抵抗骨で抑制されて受光素子の飽和がなく、またコイ
ルとコンデンサとの並列共振回路が受光素子の負荷にな
るので信号変調光と外乱光のＳ／Ｎ比が大きくとれ、照
明器具の照明光の影響もなく信号変調光に対し高感度に
なるという利点を有する。The present invention consists of a parallel resonant circuit consisting of a coil and a capacitor,
Since a photodetector such as a solar cell is connected in series and a voltage is applied to the series circuit to create a reverse bias for the photodetector, the ambient illuminance becomes extremely bright due to direct current light such as sunlight. This is also suppressed by the reverse bias voltage and the coil's low DC resistance bone, preventing saturation of the light receiving element.Also, the parallel resonant circuit of the coil and capacitor acts as a load on the light receiving element, so the signal modulation light and the disturbance light are S/ It has the advantage of having a large N ratio and being highly sensitive to signal modulated light without being affected by the illumination light of the lighting equipment.
第１図、第２図は従来例の回路図、第３図は本考案の一
実施例の回路図、第４図は同上の動作特性図であり、１
はコイル、２はコンテ゛ンサ、３は受光素子、＋Ｖｃｃ
は電源部である。1 and 2 are circuit diagrams of a conventional example, FIG. 3 is a circuit diagram of an embodiment of the present invention, and FIG. 4 is an operating characteristic diagram of the same.
is a coil, 2 is a capacitor, 3 is a light receiving element, +Vcc
is the power supply section.
Claims (1)
路に対して直列接続する太陽電池のような受光素子と、
並列共振回路と受光素子との直列回路に受光素子に対し
て逆バイアスとなる電圧を印加する電源部とを備えて戒
る光線式検知器の受光回路。A parallel resonant circuit of a coil and a capacitor, a light receiving element such as a solar cell connected in series to the parallel resonant circuit,
A light-receiving circuit for a light beam detector includes a parallel resonant circuit and a series circuit of a light-receiving element, and a power supply section that applies a reverse bias voltage to the light-receiving element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10344677U JPS5920653Y2 (en) | 1977-07-30 | 1977-07-30 | Photodetector circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10344677U JPS5920653Y2 (en) | 1977-07-30 | 1977-07-30 | Photodetector circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5430881U JPS5430881U (en) | 1979-02-28 |
| JPS5920653Y2 true JPS5920653Y2 (en) | 1984-06-15 |
Family
ID=29043965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10344677U Expired JPS5920653Y2 (en) | 1977-07-30 | 1977-07-30 | Photodetector circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5920653Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56143924A (en) * | 1980-04-11 | 1981-11-10 | Komatsu Ltd | Photodetector |
-
1977
- 1977-07-30 JP JP10344677U patent/JPS5920653Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5430881U (en) | 1979-02-28 |
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