JPH0195828U - - Google Patents
Info
- Publication number
- JPH0195828U JPH0195828U JP19152687U JP19152687U JPH0195828U JP H0195828 U JPH0195828 U JP H0195828U JP 19152687 U JP19152687 U JP 19152687U JP 19152687 U JP19152687 U JP 19152687U JP H0195828 U JPH0195828 U JP H0195828U
- Authority
- JP
- Japan
- Prior art keywords
- input
- photocoupler
- phototransistor
- light emitting
- emitting 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.)
- Pending
Links
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Electronic Switches (AREA)
Description
第１図は本考案による入力回路の一実施例を示
す回路図、第２図は第１図の動作を示すタイムチ
ヤート、第３図は従来の入力回路の一例を示す回
路図である。
１，２：入力端子、３：入力用ホトカプラ、３
ａ：発光ダイオード、３ｂ：ホトトランジスタ、
６：出力端子、２４：帰還用ホトカプラ、２４ａ
：発光ダイオード、２４ｂ：ホトトランジスタ。
FIG. 1 is a circuit diagram showing an embodiment of an input circuit according to the present invention, FIG. 2 is a time chart showing the operation of FIG. 1, and FIG. 3 is a circuit diagram showing an example of a conventional input circuit. 1, 2: Input terminal, 3: Input photocoupler, 3
a: light emitting diode, 3b: phototransistor,
6: Output terminal, 24: Feedback photocoupler, 24a
: Light emitting diode, 24b: Phototransistor.
Claims (1)
つバツフア回路の役目を有する入力回路において
、発光ダイオードとホトトランジスタとからなる
入力用ホトカプラと、発光ダイオードを前記入力
用ホトカプラのホトトランジスタに直列に接続し
ホトトランジスタを前記入力用ホトカプラの発光
ダイオードに直列に接続した帰還用ホトカプラと
を備え、前記入力用ホトカプラの発光ダイオード
と帰還用ホトカプラのホトトランジスタとの直列
回路を前記入力端子に接続し、前記入力用ホトカ
プラのホトトランジスタを前記出力端子に接続し
たことを特徴とする入力回路。 In an input circuit that insulates between a signal input terminal and an output terminal and serves as a buffer circuit, an input photocoupler consisting of a light emitting diode and a phototransistor, and a light emitting diode connected in series with the phototransistor of the input photocoupler. and a feedback photocoupler in which a phototransistor is connected in series to a light emitting diode of the input photocoupler, and a series circuit of the light emitting diode of the input photocoupler and the phototransistor of the feedback photocoupler is connected to the input terminal. , An input circuit characterized in that a phototransistor of the input photocoupler is connected to the output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19152687U JPH0195828U (en) | 1987-12-17 | 1987-12-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19152687U JPH0195828U (en) | 1987-12-17 | 1987-12-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0195828U true JPH0195828U (en) | 1989-06-26 |
Family
ID=31482433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19152687U Pending JPH0195828U (en) | 1987-12-17 | 1987-12-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0195828U (en) |
-
1987
- 1987-12-17 JP JP19152687U patent/JPH0195828U/ja active Pending
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