JPH0275581U - - Google Patents
Info
- Publication number
- JPH0275581U JPH0275581U JP15511488U JP15511488U JPH0275581U JP H0275581 U JPH0275581 U JP H0275581U JP 15511488 U JP15511488 U JP 15511488U JP 15511488 U JP15511488 U JP 15511488U JP H0275581 U JPH0275581 U JP H0275581U
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- current detection
- phase input
- instruction signal
- detection element
- 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
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Tests Of Electronic Circuits (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Description
第１図は本考案の一実施例による発光素子故障
検出装置を示す構成図、第２図は従来の発光装置
を示す構成図である。
ここで、１は電源、２は発光素子、３はスイツ
チ素子、４は発光指示信号、５は電流検出素子、
６は差動増幅器、７は電圧比較器、８は論理積回
路である。なお、図中、同一符号は同一又は相当
部分を示す。
FIG. 1 is a block diagram showing a light emitting element failure detection device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional light emitting device. Here, 1 is a power supply, 2 is a light emitting element, 3 is a switch element, 4 is a light emission instruction signal, 5 is a current detection element,
6 is a differential amplifier, 7 is a voltage comparator, and 8 is an AND circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
う発光回路において、電源と発光素子と電流検出
素子と発光指示信号を入力とするスイツチ素子と
接地で構成される直列回路と、正相入力を発光素
子と電流検出素子の接続点に接地し、逆相入力を
電流検出素子とスイツチ素子の接続点に接続した
差動増幅器と、逆相入力を前記差動増幅器の出力
に接続し正相入力を一定の基準電圧に接続した電
圧比較器と、電圧比較器の出力と発光指示信号を
入力とする論理積回路を備えたことを特徴とする
発光素子故障検出装置。 In a light emitting circuit that turns on and off in response to a light emitting instruction signal from the outside, there is a series circuit consisting of a power supply, a light emitting element, a current detection element, a switch element that receives the light emitting instruction signal as input, and ground, and a series circuit that connects the positive phase input to the light emitting element. A differential amplifier is grounded to the connection point of the current detection element and the current detection element, and the negative phase input is connected to the connection point of the current detection element and the switch element, and the negative phase input is connected to the output of the differential amplifier to keep the positive phase input constant. 1. A light emitting element failure detection device comprising: a voltage comparator connected to a reference voltage; and an AND circuit inputting an output of the voltage comparator and a light emission instruction signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15511488U JPH0275581U (en) | 1988-11-29 | 1988-11-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15511488U JPH0275581U (en) | 1988-11-29 | 1988-11-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0275581U true JPH0275581U (en) | 1990-06-08 |
Family
ID=31432447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15511488U Pending JPH0275581U (en) | 1988-11-29 | 1988-11-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0275581U (en) |
-
1988
- 1988-11-29 JP JP15511488U patent/JPH0275581U/ja active Pending