JPS59128195U - Lamp burnout detection circuit - Google Patents
Lamp burnout detection circuitInfo
- Publication number
- JPS59128195U JPS59128195U JP20242783U JP20242783U JPS59128195U JP S59128195 U JPS59128195 U JP S59128195U JP 20242783 U JP20242783 U JP 20242783U JP 20242783 U JP20242783 U JP 20242783U JP S59128195 U JPS59128195 U JP S59128195U
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- transistor
- voltage
- generates
- 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.)
- Granted
Links
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
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図はランプの電圧電流特性図、第２図は断線検知回
路図、第３図は本考案の実施例を示す回路図、第４図は
基準電圧特性図である。
図面でＬ１〜Ｌｎは複数のランプ、Ｒ５はランプ電流比
例電圧を発生する抵抗、Ｒ，Ｒ４〜Ｒ１ｏ、 Ｔｒｌ。
Ｔｒ２． Ｄ□〜Ｄ、は基準電圧発生回路、ＣＯＭＰは
比較回路、Ｒは基準電圧を発生する抵抗、Ｔｒ２は第１
のトランジスタ、Ｒ１−Ｒ７はその抵抗、Ｄ２〜Ｄ、は
そのダイオード、Ｔｒ□は第２のトランジスタ、Ｒ８は
その抵抗、Ｄｌはそのダイオードである。FIG. 1 is a voltage-current characteristic diagram of a lamp, FIG. 2 is a disconnection detection circuit diagram, FIG. 3 is a circuit diagram showing an embodiment of the present invention, and FIG. 4 is a reference voltage characteristic diagram. In the drawing, L1 to Ln are a plurality of lamps, R5 is a resistor that generates a voltage proportional to the lamp current, and R, R4 to R1o, and Trl. Tr2. D□ to D are reference voltage generation circuits, COMP is a comparison circuit, R is a resistor that generates the reference voltage, and Tr2 is the first
, R1-R7 are its resistances, D2-D are its diodes, Tr□ is the second transistor, R8 is its resistance, and Dl is its diode.
Claims (1)
を検知する回路において、 該ランプへ流れる全電流に比例する電圧を生じる抵抗と
、該ランプ群の電圧電流特性を３直線で近似した特性を
持つ基準電圧を発生する回路と、前記のランプ電流比例
電圧が前記特性の基準電圧より小になるときランプ断線
を示す出力を生じる比較回路とを備え、該基準電圧を発
生する回路は、該比較回路に接続されて基準電圧を発生
する第１の抵抗と、ベースが第２、第３の抵抗を介して
該第１の抵抗へ、ダイオードを介して低電位側の電源線
へ接続され且つコレクタ・霊ミッタ間及び第４の抵抗を
介して該第１の抵抗に電流を流す第１のトランジスタと
、該第２と第３の抵抗の接続点にベースが接続され、該
第４の抵抗に流れる電流を増加させるための第２のトラ
ンジスタと具備し、該電源の電圧が第１の範囲に於いて
該第１のトランジスタのみが導通し、第２の範囲に於い
ては該ダイオードが導通して該第１のトランジスタのベ
ース電位をクランプし、第３の範囲に於いては該第２の
トランジスタが導通し該第４の抵抗へ流れる電流が増加
する様に該第２．３．４の抵抗の値を設定したことを特
徴とするランプ断線検知回路。[Claims for Utility Model Registration] In a circuit for detecting a break in one or more of a plurality of lamps connected in parallel to a power source, a resistor that generates a voltage proportional to the total current flowing through the lamps, and a voltage across the group of lamps. A circuit that generates a reference voltage having a characteristic that approximates the current characteristic by three straight lines, and a comparison circuit that generates an output indicating lamp breakage when the lamp current proportional voltage becomes smaller than the reference voltage of the characteristic, The circuit that generates the reference voltage includes a first resistor that is connected to the comparator circuit and generates the reference voltage, and a base that is connected to the first resistor through a second and third resistor, and a low voltage resistor that is connected to the first resistor through a diode. A first transistor that is connected to the power supply line on the potential side and allows current to flow through the first resistor between the collector and the spiritual transmitter and through the fourth resistor, and a base at the connection point between the second and third resistors. is connected to the second transistor for increasing the current flowing through the fourth resistor, and when the voltage of the power supply is in the first range, only the first transistor is conductive and the second transistor is connected to the second transistor. In a range, the diode conducts and clamps the base potential of the first transistor, and in a third range, the second transistor conducts and increases the current flowing to the fourth resistor. A lamp breakage detection circuit, characterized in that the value of the resistor of 2.3.4 is set as follows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20242783U JPS59128195U (en) | 1983-12-28 | 1983-12-28 | Lamp burnout detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20242783U JPS59128195U (en) | 1983-12-28 | 1983-12-28 | Lamp burnout detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59128195U true JPS59128195U (en) | 1984-08-29 |
| JPH04560Y2 JPH04560Y2 (en) | 1992-01-09 |
Family
ID=30427898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20242783U Granted JPS59128195U (en) | 1983-12-28 | 1983-12-28 | Lamp burnout detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59128195U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010119901A1 (en) * | 2009-04-15 | 2010-10-21 | ボッシュ株式会社 | Abnormalit detection device for detection circuit and electric circuit, and detection system and electronic system using the abnormality detection device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50132784A (en) * | 1974-04-08 | 1975-10-21 |
-
1983
- 1983-12-28 JP JP20242783U patent/JPS59128195U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50132784A (en) * | 1974-04-08 | 1975-10-21 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010119901A1 (en) * | 2009-04-15 | 2010-10-21 | ボッシュ株式会社 | Abnormalit detection device for detection circuit and electric circuit, and detection system and electronic system using the abnormality detection device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04560Y2 (en) | 1992-01-09 |
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