JPS603132U - Lamp lighting and disconnection detection circuit - Google Patents
Lamp lighting and disconnection detection circuitInfo
- Publication number
- JPS603132U JPS603132U JP9414183U JP9414183U JPS603132U JP S603132 U JPS603132 U JP S603132U JP 9414183 U JP9414183 U JP 9414183U JP 9414183 U JP9414183 U JP 9414183U JP S603132 U JPS603132 U JP S603132U
- Authority
- JP
- Japan
- Prior art keywords
- lamp
- lamp lighting
- detection circuit
- disconnection detection
- switching transistor
- 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.)
- Granted
Links
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来のランプ点灯回路を示す回路図、第２図は
従来のランプ断線検出回路を示す回路図、第３図は第１
及び第２図に示す回路を組合せてなる従来のランプ点灯
及び断線検出回路を示す回路図、及び第４図は本考案に
よるランプ点灯及び断線検出回路の一実施例を示す回路
図である。
Ｑ２・・・・・・スイッチングトランジスタ、Ｑ、・・
・・・・断線検出用トランジスタ、Ｒ１・・・・・・負
荷抵抗、Ｌｌ。
Ｌ２・・・・・・ランプ、Ｓ・・・・・・ランプ点灯用
スイッチ。Fig. 1 is a circuit diagram showing a conventional lamp lighting circuit, Fig. 2 is a circuit diagram showing a conventional lamp burnout detection circuit, and Fig. 3 is a circuit diagram showing a conventional lamp burnout detection circuit.
FIG. 4 is a circuit diagram showing an embodiment of the lamp lighting and disconnection detection circuit according to the present invention. Q2...Switching transistor, Q,...
...Disconnection detection transistor, R1...Load resistance, Ll. L2...Lamp, S...Lamp lighting switch.
Claims (1)
ンプにそれぞれ接続したスイッチングトランジスタを備
え、該スイッチングトランジスタをランプ点灯用スイッ
チによりオンさせてランプを点灯すると共に、°前記負
荷抵抗とランプの接続点と前記スイッチングトランジス
タのベース電圧の変化に応じて電圧が変化する点とにラ
ンプ断線検出用トランジスタのエミッタとベースをそれ
ぞれ接続し、該ランプ断線検出用トランジスタを前記両
点の電位差の増大により導通させてランプ断線を検出す
るようにしたことを特徴とするランプ点灯及び断線検出
回路。A switching transistor is provided, the emitter of which is connected to a DC power supply, and the collector of which is connected to a lamp via a load resistor, and the switching transistor is turned on by a lamp lighting switch to light the lamp, and the connection point between the load resistor and the lamp is provided. and a point whose voltage changes in accordance with a change in the base voltage of the switching transistor, respectively, are connected to the emitter and base of a lamp burnout detection transistor, and the lamp burnout detection transistor is made conductive by increasing the potential difference between the two points. A lamp lighting and disconnection detection circuit, characterized in that the circuit detects lamp disconnection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9414183U JPS603132U (en) | 1983-06-21 | 1983-06-21 | Lamp lighting and disconnection detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9414183U JPS603132U (en) | 1983-06-21 | 1983-06-21 | Lamp lighting and disconnection detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS603132U true JPS603132U (en) | 1985-01-11 |
| JPH0130266Y2 JPH0130266Y2 (en) | 1989-09-14 |
Family
ID=30225485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9414183U Granted JPS603132U (en) | 1983-06-21 | 1983-06-21 | Lamp lighting and disconnection detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS603132U (en) |
-
1983
- 1983-06-21 JP JP9414183U patent/JPS603132U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0130266Y2 (en) | 1989-09-14 |
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