JPS6117176B2 - - Google Patents
Info
- Publication number
- JPS6117176B2 JPS6117176B2 JP17502180A JP17502180A JPS6117176B2 JP S6117176 B2 JPS6117176 B2 JP S6117176B2 JP 17502180 A JP17502180 A JP 17502180A JP 17502180 A JP17502180 A JP 17502180A JP S6117176 B2 JPS6117176 B2 JP S6117176B2
- Authority
- JP
- Japan
- Prior art keywords
- current
- power supply
- circuit
- voltage
- load
- 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
- 238000001514 detection method Methods 0.000 claims description 17
- 230000015556 catabolic process Effects 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 4
- 238000013459 approach Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009499 grossing Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/18—Modifications for indicating state of switch
Landscapes
- Electronic Switches (AREA)
- Power Conversion In General (AREA)
- Thyristor Switches And Gates (AREA)
Description
【発明の詳細な説明】
この発明は、近接スイツチや光電スイツチ等の
２線式電子スイツチに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to two-wire electronic switches such as proximity switches and photoelectric switches.
光源スイツチは光を利用して物体を検出するも
のであり、また近接スイツチは検出コイルを有し
て発振回路を構成し、物体が検出コイルに近づく
ことにより発振振幅が変化することを利用するも
のである。これら光電スイツチや近接スイツチ等
の２線式のものは、電源線及び信号線も含めてリ
ード線が２線のみであり、この２線に電源と負荷
とを直列に接続し、検出動作に応じて直接負荷を
開閉することができるようにしたものである。そ
のため、負荷電流が開閉できる程のスイツチング
素子を備えており、このスイツチング素子がオン
になつたとき前記２線間が短絡されて負荷電流が
流れ、かつ内部回路にも必要な電流が流れるよう
にし、またスイツチング素子がオフのときには内
部回路が必要とする微少な電流のみが負荷を流れ
て負荷がオンしないように構成されている。 A light source switch uses light to detect an object, and a proximity switch has a detection coil to form an oscillation circuit, and takes advantage of the fact that the oscillation amplitude changes when an object approaches the detection coil. It is. These two-wire type switches such as photoelectric switches and proximity switches have only two lead wires, including the power supply line and signal line, and the power supply and load are connected in series to these two wires, and the This allows the load to be opened and closed directly. Therefore, it is equipped with a switching element that can open and close the load current, and when this switching element is turned on, the two wires are shorted, allowing the load current to flow, and the necessary current also flowing to the internal circuit. Further, when the switching element is off, only a small amount of current required by the internal circuit flows through the load, so that the load is not turned on.
ところで最近この２線式電子スイツチにおい
て、各種回路を共通化し、かつ小型化を図るた
め、汎用ICパツクとして回路構成することが行
なわれて来つつある。そのため発光ダイオード
（LED）によつて動作表示させるタイプを考慮す
ると、LED点灯用のピンをこの汎用ICに最初か
ら設けなければならない。 Recently, in order to standardize various circuits and reduce the size of the two-wire electronic switch, the circuit has been constructed as a general-purpose IC pack. Therefore, if we consider a type that uses light emitting diodes (LEDs) to indicate operation, it is necessary to provide a pin for LED lighting on this general-purpose IC from the beginning.
本発明は、LED点灯用のピンがない場合でも
LEDによつて動作表示でき、そのことによつて
汎用ICパツクとしては点灯用ピンを設けないも
のとし、低価格化を図るようにした２線式電子ス
イツチを提供することを目的とする。 The present invention can be used even when there is no pin for LED lighting.
The purpose of the present invention is to provide a two-wire electronic switch whose operation can be indicated by an LED, thereby eliminating the need for a lighting pin as a general-purpose IC pack and reducing the price.
以下、本発明を２線式近接スイツチに適用した
一実施例について説明する。第１図において、近
接センサ回路１１と、平滑コンデンサ１２と、逆
流防止用ダイオード１３，１４と、ツエナダイオ
ード１５，１６と、サイリスタ１７，１８とを主
に含んでICパツク１が構成されている。近接セ
ンサ回路１１は、外付部品の検出コイル２１を含
んで構成される発振回路と、その発振振幅を検出
する検出回路とを含んでおり、物体が検出コイル
２１に近づいたときあるいは遠ざかつたときに検
出信号を生じてサイリスタ１７，１８をターンオ
ンする。なお、外付部品のコンデンサ２２は検出
コイル２１とともに共振回路をなすものであり、
また可変抵抗２３は感度調整用である。 An embodiment in which the present invention is applied to a two-wire proximity switch will be described below. In FIG. 1, an IC pack 1 mainly includes a proximity sensor circuit 11, a smoothing capacitor 12, backflow prevention diodes 13 and 14, Zener diodes 15 and 16, and thyristors 17 and 18. . The proximity sensor circuit 11 includes an oscillation circuit that includes a detection coil 21 as an external component, and a detection circuit that detects the oscillation amplitude, and detects when an object approaches or moves away from the detection coil 21. A detection signal is generated to turn on the thyristors 17 and 18. Note that the external component capacitor 22 forms a resonant circuit together with the detection coil 21.
Further, the variable resistor 23 is used for sensitivity adjustment.
サイリスタ１８は比較的小さな電流容量のもの
で、負荷電流が小さなものでよい場合には、第１
図に示すような全波整流回路４をこのサイリスタ
１８のアノード．カソード間に接続し、この全波
整流回路４を介して負荷５と交流電源６とを直列
に接続して負荷５を開閉制御することもできる
が、この第１図ではサイリスタ１８により大電流
容量のサイリスタ３のゲートを制御して、より大
きな電流の負荷５を制御するようにしている。そ
してサイリスタ１８への電流供給線の途中、この
実施例ではサイリスタ３のアノードとの間に第２
図イに示すような電圧−電流特性カーブの傾きの
小さいツエナダイオード８と、第２図ロに示すよ
うな電圧−電流特性カーブをもつLED７との並
列回路を挿入している。すなわち、この第２図
イ，ロに示すように、ツエナダイオード８はその
降伏電圧が発行ダイオード７の順方向立上り電圧
より小さく且つその電圧−電流特性カーブの降伏
電圧より大なる領域での傾きが発光ダイオード７
の電圧−電流特性カーブの傾きよりも小さいもの
となつている。このような特性のツエナダイオー
ド８として、たとえば(株)日立製作所；HZ2やHZ2
を用いることができる。 The thyristor 18 has a relatively small current capacity, and if the load current only needs to be small, the first
A full-wave rectifier circuit 4 as shown in the figure is connected to the anode of this thyristor 18. It is also possible to control the opening and closing of the load 5 by connecting the load 5 and the AC power supply 6 in series through the full-wave rectifier circuit 4, but in this figure, the thyristor 18 is used to control the load 5, which has a large current capacity. The gate of the thyristor 3 is controlled to control a larger current load 5. In the middle of the current supply line to the thyristor 18, in this embodiment, a second
A parallel circuit is inserted between a Zener diode 8 having a voltage-current characteristic curve with a small slope as shown in Figure A and an LED 7 having a voltage-current characteristic curve as shown in Figure 2B. That is, as shown in Figure 2 A and B, the Zener diode 8 has a slope in the region where its breakdown voltage is smaller than the forward rising voltage of the issuing diode 7 and larger than the breakdown voltage of its voltage-current characteristic curve. light emitting diode 7
The slope of the voltage-current characteristic curve is smaller than the slope of the voltage-current characteristic curve. Examples of Zener diodes 8 with such characteristics include Hitachi, Ltd.'s HZ2 and HZ2.
can be used.
検出信号が“Ｌ”のときはサイリスタ１７はオ
フであるから、サイリスタ１８，３もまたオフで
あり、このときにはタイオード１３を通じてコン
デンサ１２に充電され、このコンデンサ１２の両
端から近接センサ回路１１に電流が供給される。
この近接センサ回路１１は極力低消費電流化され
ており、そのため負荷５には極めて微少な電流し
か流れない。 When the detection signal is "L", the thyristor 17 is off, so the thyristors 18 and 3 are also off, and at this time, the capacitor 12 is charged through the diode 13, and current flows from both ends of the capacitor 12 to the proximity sensor circuit 11. is supplied.
This proximity sensor circuit 11 has a low current consumption as much as possible, so that only an extremely small current flows through the load 5.
検出信号が“Ｈ”のときにはサイリスタ１７が
オンになるので、全波整流電圧の瞬時値が低いう
ちはツエナダイオード１６がオフであり、ダイオ
ード１４を通じてコンデンサ１２及び近接センサ
回路１１に電流が供給される。そして瞬時値が大
きくなるとツエナダイオード１６がオンし、その
結果、サイリスタ１８がオンとなつて更にサイリ
スタ３がオンになる。従つてこの場合、一種の位
相制御が行なわれ、交流電圧の瞬時値が低い小さ
な位相角の間、近接センサ回路１１に電流が供給
され、その他の大部分の位相角においてサイスタ
３を通じて大電流が流れる。 Since the thyristor 17 is turned on when the detection signal is "H", the Zener diode 16 is turned off while the instantaneous value of the full-wave rectified voltage is low, and current is supplied to the capacitor 12 and the proximity sensor circuit 11 through the diode 14. Ru. When the instantaneous value increases, the Zener diode 16 is turned on, and as a result, the thyristor 18 is turned on, and the thyristor 3 is also turned on. Therefore, in this case, a kind of phase control is carried out, in which current is supplied to the proximity sensor circuit 11 during a small phase angle where the instantaneous value of the alternating voltage is low, and a large current is supplied through the cystor 3 at most other phase angles. flows.
ところでサイリスタ３のアノードからサイリス
タ１８のアノードへ流れる電流は、サイリスタ１
７，１８，３がオフのときには小さく、第２図の
Ｉpよりも小さくなつているため、ツエナダイオ
ード８を通じてのみ電流が流れ、LED７は点灯
しない。これに対しサイリスタ１７，１８，３が
オンになつているときは、第２図のＩpよりも大
きな電流が流れるため、LED７にも電流が流れ
始めて点灯する。こうして動作表示がなされる。 By the way, the current flowing from the anode of thyristor 3 to the anode of thyristor 18 is
When 7, 18, and 3 are off, the current is small and is smaller than I p in FIG. 2, so current flows only through the Zener diode 8, and the LED 7 does not light up. On the other hand, when the thyristors 17, 18, and 3 are turned on, a current larger than I p in FIG. 2 flows, so a current also starts to flow to the LED 7, causing it to light up. In this way, the operation is displayed.
なお、上記の実施例でスイツチング素子はサイ
リスタを用いたが、他の半導体スイツチング素子
を用いることもできる。また、スイツチング素子
がオンのときに一種の位相制御を行なうようにし
て内部回路に電流を供給するようにしているが、
スイツチング素子に直列に定電圧ダイオード等を
挿入し、この定電圧ダイオードの両端から電流を
供給するようにした一種の電圧分割方式を採用す
ることもできる。 Although a thyristor was used as the switching element in the above embodiment, other semiconductor switching elements may also be used. Also, when the switching element is on, a type of phase control is performed to supply current to the internal circuit.
It is also possible to adopt a type of voltage division method in which a constant voltage diode or the like is inserted in series with the switching element and current is supplied from both ends of the constant voltage diode.
以上説明したように、この発明によれば、２線
式電子スイツチの２本の電源線の一方にツエナダ
イオードとLEDとの並列回路を挿入している。
この２線式電子スイツチでは、オンのときに２つ
の電源線間に大電流が流れ、オフのときは、この
２線式電子スイツチ内蔵の検出回路の動作に必要
な微小電流のみが流れる。上記の並列回路のツエ
ナダイオードはこの微小電流を流し、LEDは大
電流を流す。そのため、単に電源線に上記の並列
回路を入れるだけで、LED点灯用の別出力を出
す構成をとらなくても動作表示ができる（なお、
ここで言う２線式電子スイツチというのは、２線
式電子スイツチの必須部分であり、実施例の場合
はICパツク１を指していると考えてよい。この
ICパツク１だけでも、電源が直流で且つ負荷の
駆動電流がサイリスタ１８で開閉できる程のもの
であれば２線式電子スイツチとして十分に機能す
るからである。この実施例では、ICパツク１
に、さらに大きなサイリスタ３を設けて駆動電流
の大きな負荷５に対応しているとともに、交流電
源６を用いるために全波整流回路４を付加してい
る）。そのため、２線式電子スイツチの必須部分
の汎用ICパツク（第１図のICパツク１のよう
な）を用いて各種の２線式電子スイツチを構成す
る（第１図のように大電流用に別にサイリスタ３
を付加したり交流開閉のために全波整流回路４を
付加したりして）場合にも、LED点灯用ピンな
どのない最も汎用型のICパツクであつても、動
作表示するタイプを簡単且つ安価に作ることがで
きるという利点がある。 As explained above, according to the present invention, a parallel circuit of a Zener diode and an LED is inserted into one of the two power lines of a two-wire electronic switch.
In this two-wire electronic switch, a large current flows between the two power supply lines when it is on, and only a small current necessary for the operation of the detection circuit built into the two-wire electronic switch flows when it is off. The Zener diode in the parallel circuit above flows this small current, and the LED flows a large current. Therefore, by simply inserting the above parallel circuit into the power supply line, you can display the operation without having to configure a separate output for lighting the LED.
The two-wire electronic switch mentioned here is an essential part of the two-wire electronic switch, and can be considered to refer to the IC pack 1 in this embodiment. this
This is because the IC pack 1 alone can function satisfactorily as a two-wire electronic switch if the power source is DC and the drive current for the load is such that it can be opened and closed by the thyristor 18. In this example, IC pack 1
In addition, a larger thyristor 3 is provided to handle a load 5 with a large drive current, and a full-wave rectifier circuit 4 is added to use an AC power source 6). Therefore, various 2-wire electronic switches are constructed using a general-purpose IC pack (such as IC pack 1 in Figure 1), which is an essential part of a 2-wire electronic switch (such as IC pack 1 in Figure 1). Separately, thyristor 3
Even when adding a full-wave rectifier circuit 4 for AC switching or switching), even the most general-purpose IC pack without LED lighting pins can easily and easily change the type of operation display. It has the advantage of being cheap to produce.
第１図は本発明の一実施例の回路図、第２図は
電圧−電流特性図である。
１……ICパツク、１１……近接センサ回路、
２１……検出コイル、５……負荷、６……交流電
源。
FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a voltage-current characteristic diagram. 1...IC pack, 11...Proximity sensor circuit,
21...Detection coil, 5...Load, 6...AC power supply.
Claims (1)
本の電源線を有し、該２本の電源線の間に、検出
動作に応じて検出信号を生じる検出回路と、この
検出信号に応じてスイツチングするスイツチング
素子とを並列に接続し、前記検出回路の検出動作
に応じて前記スイツチング素子がオンすることに
よつて前記２本の電源線間が実質的に短絡状態と
なつて負荷に駆動電流を流すようにし、且つ前記
スイツチング素子がオンして前記２本の電源線間
が実質的に短絡されているときに前記検出回路に
その動作に必要な微小電流を供給する給電回路を
備える２線式電子スイツチにおいて、前記２本の
電源線の一方に、ツエナ特性を生じる方向に接続
されるツエナダイオードと順方向に接続される発
光ダイオードとの並列回路を挿入し、前記ツエナ
ダイードはその降伏電圧が前記発光ダイオードの
順方向立上り電圧より小さく且つその電圧−電流
特性カーブの降伏電圧より大なる領域での傾きが
前記発光ダイオードの電圧−電流特性カーブの傾
きよりも小さいものとしたことを特徴とする２線
式電子スイツチ。1 Connected to the power supply with a load inserted in the middle 2
A detection circuit that generates a detection signal in response to a detection operation and a switching element that switches in response to this detection signal are connected in parallel between the two power supply lines. When the switching element is turned on in response to a detection operation of the circuit, the two power supply lines are substantially short-circuited, causing a drive current to flow to the load, and the switching element is turned on. In a two-wire electronic switch comprising a power supply circuit that supplies the detection circuit with a minute current necessary for its operation when the two power supply lines are substantially short-circuited, one of the two power supply lines A parallel circuit of a Zener diode connected in the direction that produces the Zener characteristic and a light emitting diode connected in the forward direction is inserted, and the Zener diode has a breakdown voltage smaller than the forward rising voltage of the light emitting diode, and the voltage - A two-wire electronic switch characterized in that the slope of the current characteristic curve in a region greater than the breakdown voltage is smaller than the slope of the voltage-current characteristic curve of the light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17502180A JPS5799035A (en) | 1980-12-11 | 1980-12-11 | Two-wire type electronic switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17502180A JPS5799035A (en) | 1980-12-11 | 1980-12-11 | Two-wire type electronic switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5799035A JPS5799035A (en) | 1982-06-19 |
| JPS6117176B2 true JPS6117176B2 (en) | 1986-05-06 |
Family
ID=15988825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17502180A Granted JPS5799035A (en) | 1980-12-11 | 1980-12-11 | Two-wire type electronic switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5799035A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2627844B2 (en) * | 1992-02-19 | 1997-07-09 | 宮城タイル興業株式会社 | Mobile roof for construction site |
| US8482162B2 (en) * | 2010-05-03 | 2013-07-09 | Kulite Semiconductor Products, Inc. | Two lead electronic switch system adapted to replace a mechanical switch system |
-
1980
- 1980-12-11 JP JP17502180A patent/JPS5799035A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5799035A (en) | 1982-06-19 |
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