JPH0359733U - - Google Patents
Info
- Publication number
- JPH0359733U JPH0359733U JP12030989U JP12030989U JPH0359733U JP H0359733 U JPH0359733 U JP H0359733U JP 12030989 U JP12030989 U JP 12030989U JP 12030989 U JP12030989 U JP 12030989U JP H0359733 U JPH0359733 U JP H0359733U
- Authority
- JP
- Japan
- Prior art keywords
- led
- circuit
- malfunction detection
- voltage
- smoothing circuit
- 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
- 238000001514 detection method Methods 0.000 claims description 7
- 230000007257 malfunction Effects 0.000 claims description 7
- 238000009499 grossing Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Electronic Switches (AREA)
Description
第１図は、この考案の一実施例を示す光電スイ
ツチの投光回路のＬＥＤ誤動作検出装置の回路図
、第２図、第３図は、同ＬＥＤ誤動作検出装置の
動作を説明するための各部波形図、第４図は、他
の実施例を示す誤動作検知回路の回路図、第５図
は、従来のＬＥＤ誤動作検出装置を示す回路図で
ある。
２１……ＬＥＤ、２４……ＬＥＤ駆動回路、２
７……平滑回路、３６……誤動作検知回路。
FIG. 1 is a circuit diagram of an LED malfunction detection device for a light projection circuit of a photoelectric switch showing an embodiment of this invention, and FIGS. 2 and 3 show various parts for explaining the operation of the LED malfunction detection device. A waveform diagram, FIG. 4 is a circuit diagram of a malfunction detection circuit showing another embodiment, and FIG. 5 is a circuit diagram showing a conventional LED malfunction detection device. 21...LED, 24...LED drive circuit, 2
7... Smoothing circuit, 36... Malfunction detection circuit.
Claims (1)
駆動するＬＥＤ駆動回路と、前記ＬＥＤに流れる
電流に応じた電圧を平滑化する平滑回路と、この
平滑回路よりの電圧と基準電圧とを比較し、前記
ＬＥＤの平均電流が所定範囲を越えた場合に警告
信号を出力する誤動作検知回路とからなることを
特徴とするＬＥＤ誤動作検出装置。 an LED, an LED drive circuit that receives a pulse signal and drives the LED, a smoothing circuit that smoothes a voltage according to the current flowing through the LED, and compares the voltage from this smoothing circuit with a reference voltage, An LED malfunction detection device comprising: a malfunction detection circuit that outputs a warning signal when the average current of the LED exceeds a predetermined range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12030989U JPH0359733U (en) | 1989-10-13 | 1989-10-13 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12030989U JPH0359733U (en) | 1989-10-13 | 1989-10-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0359733U true JPH0359733U (en) | 1991-06-12 |
Family
ID=31668392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12030989U Pending JPH0359733U (en) | 1989-10-13 | 1989-10-13 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0359733U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59103969A (en) * | 1982-12-06 | 1984-06-15 | Nissan Motor Co Ltd | Igniter for internal-combustion engine |
| JPS6118640B2 (en) * | 1981-04-15 | 1986-05-13 | Nippon Rotsukuraapaipu Kk |
-
1989
- 1989-10-13 JP JP12030989U patent/JPH0359733U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6118640B2 (en) * | 1981-04-15 | 1986-05-13 | Nippon Rotsukuraapaipu Kk | |
| JPS59103969A (en) * | 1982-12-06 | 1984-06-15 | Nissan Motor Co Ltd | Igniter for internal-combustion engine |