JPH0361358U - - Google Patents
Info
- Publication number
- JPH0361358U JPH0361358U JP12275589U JP12275589U JPH0361358U JP H0361358 U JPH0361358 U JP H0361358U JP 12275589 U JP12275589 U JP 12275589U JP 12275589 U JP12275589 U JP 12275589U JP H0361358 U JPH0361358 U JP H0361358U
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- circuit
- instruction signal
- current detection
- output
- 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 6
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Testing Or Measuring Of Semiconductors Or The Like (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。
図において、１……電源、２……発光素子、３
……スイツチ素子、４……発光指示信号、５……
電流検出素子、６……差動増幅器、７……微分回
路、８……フリツプフロツプ、９……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. In the figure, 1...power supply, 2...light emitting element, 3
...Switch element, 4...Light emission instruction signal, 5...
Current detection element, 6... differential amplifier, 7... differential circuit, 8... flip-flop, 9... logical product circuit. Note that the same reference numerals in the figures indicate the same or equivalent parts.
Claims (1)
う発光回路において、電源と複数の発光素子を並
列に接続した回路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
接続点に接続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、入力を
前記差動増幅器の出力に接続した微分回路と、微
分回路の出力を保持するフリツプフロツプと、フ
リツプフロツプ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 an external light emitting instruction signal, a series circuit consisting of a power supply, a circuit in which multiple light emitting elements are connected in parallel, a current detection element, a switch element that receives the light emitting instruction signal as input, and ground. and a differential amplifier whose positive phase input is connected to the connection point between the light emitting element and the current detection element and whose negative phase input is connected to the connection point between the current detection element and the switch element, and whose input is connected to the output of the differential amplifier. 1. A light emitting element failure detection device comprising a differentiating circuit, a flip-flop holding the output of the differentiating circuit, and an AND circuit inputting the output of the flip-flop and a light emission instruction signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12275589U JPH0361358U (en) | 1989-10-20 | 1989-10-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12275589U JPH0361358U (en) | 1989-10-20 | 1989-10-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0361358U true JPH0361358U (en) | 1991-06-17 |
Family
ID=31670749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12275589U Pending JPH0361358U (en) | 1989-10-20 | 1989-10-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0361358U (en) |
-
1989
- 1989-10-20 JP JP12275589U patent/JPH0361358U/ja active Pending
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